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DESCRIPTION JP6366030

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DESCRIPTION JP6366030
Abstract: Even with the use of a single battery, voltage is supplied to various loads constituting an
electric circuit to be built in, and the handling at the time of use is improved to improve the
convenience of the user. A microphone handset 2 wirelessly transmits a collected audio signal to
a master handset 3. The microphone slave unit 2 is connected in series to one battery 16 and the
battery 16, and a rush current prevention circuit 51 for suppressing the rush current from the
battery 16, a large capacity capacitor 52, and a control unit which is a plurality of loads 10, the
radio unit 11 (including the preamplifier 11z), the power amplifier 11A, the memory 15, and the
display unit 14 are respectively connected in series between the large capacity capacitor 52, and
connected based on the output of the large capacity capacitor 52 And a set of a plurality of DCDC
upconverters 53 to 56 and constant voltage regulators 57 to 59 for outputting a voltage
according to the load to be output. [Selected figure] Figure 6
Microphone device
[0001]
The present disclosure relates to a microphone device that transmits a collected voice signal to a
receiver wirelessly.
[0002]
Conventionally, when driving a wireless microphone as an example of a microphone device that
performs time-division communication for transmitting a collected audio signal wirelessly to a
receiver, each of the various electric circuits included in the microphone device is configured. In
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order to supply sufficient current to the load which fluctuates in time division, usually, two or
more AA type batteries or lithium ion batteries having a large voltage are used.
On the other hand, if only one AA type battery is used, the current that can be supplied is limited.
For example, when the power is turned on or when wireless communication is sent, a large
current flows to supply a sufficient voltage. In some cases, the load could not be driven.
[0003]
Patent Document 1 discloses a wireless communication system including one master unit and a
plurality of microphone slave units, and the master unit performs wireless communication with
each microphone slave unit according to a time division multiplex communication method. In this
wireless communication system, in order to suppress radio wave interference to another wireless
communication system, the master unit suppresses transmission power to a remote microphone
slave unit to such an extent that communication can be maintained.
[0004]
Unexamined-Japanese-Patent No. 2015-50727
[0005]
However, in the prior art including the patent document 1, when two AA batteries are used for
the above-mentioned wireless microphone, for example, the housing of the wireless microphone
(for example, the housing on the side where the battery is built) As it becomes heavy or large, the
sense of balance of the weight of the wireless microphone case is not good, and it may be
difficult to handle holding a hand for a long time and talking.
In addition, when the number of batteries increases, it is difficult to miniaturize the wireless
microphone, which may impair the design of the microphone.
[0006]
The present disclosure has been devised in view of the above-described conventional situation,
and even with the use of a single battery, the user can supply voltages to various loads
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constituting the built-in electric circuit to improve handling at the time of use. It is an object of
the present invention to provide a microphone device that improves the convenience of the
present invention.
[0007]
The present disclosure is a microphone device that transmits a collected audio signal to a
receiver wirelessly, and includes a battery and a capacitor connected in series with the battery
and having a capacitor having a predetermined capacity. Are connected in series between the
current suppression unit that suppresses the current flow, and the current suppression unit and
each of the plurality of loads, and based on the output of the current suppression unit, outputs
voltages according to the connected loads. A plurality of transformers, and a wireless
communication unit performing wireless communication using the time division multiplex
communication method with the receiver as the load, and the wireless communication unit is
configured to receive the current from the battery. The collected audio signal is transmitted to
the receiver using the charge stored in the capacitor.
[0008]
According to the present disclosure, even with the use of one battery, it is possible to supply
voltage to various loads constituting the built-in electric circuit, and the handling at the time of
use can be improved to improve the convenience of the user.
[0009]
A diagram schematically showing an example of a system configuration of a wireless microphone
system according to Embodiment 1. A time slot in which a wireless signal is transmitted and
received between a master unit and a microphone slave unit, and an amount of current flowing
to the microphone slave unit for each time slot A diagram showing an example of a variation of a
frame A diagram showing an example of a frame configuration of a wireless signal in DECT
communication A block diagram showing an example of a hardware configuration of a slave
device A diagram showing an example of a schematic configuration of a power supply unit
according to a comparative example A diagram showing an example of the schematic
configuration of the power supply unit A diagram showing an example of the configuration of the
suppression circuit according to the embodiment 2 A flowchart for explaining in detail an
example of the starting operation procedure of the microphone slave device according to the
embodiment 2 A figure showing an example of composition of the control circuit concerned A
flow chart which explains in detail an example of starting operation procedure of a microphone
child machine concerning Embodiment 3 An example of schematic composition of a power
supply part concerning Embodiment 4 The flowchart illustrating in detail an example of the startup operation procedure of the sub-microphone according to the fourth embodiment
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[0010]
Hereinafter, each embodiment which specifically disclosed the microphone device concerning
this indication is described in detail, referring to an accompanying drawing suitably.
However, the detailed description may be omitted if necessary.
For example, detailed description of already well-known matters and redundant description of
substantially the same configuration may be omitted.
This is to avoid unnecessary redundancy in the following description and to facilitate
understanding by those skilled in the art.
It is to be understood that the attached drawings and the following description are provided to
enable those skilled in the art to fully understand the present disclosure, and they are not
intended to limit the claimed subject matter.
[0011]
The microphone device according to each embodiment is a wireless microphone that transmits
the collected voice signal to the parent device wirelessly. In a wireless microphone system
configured of a parent device and a plurality of wireless microphones, each of the plurality of
wireless microphones communicates with the parent device, for example, in a time division
multiple access (TDMA) system. In the following description, the wireless microphone is simply
referred to as "microphone handset".
[0012]
First Embodiment FIG. 1 is a view schematically showing an example of a system configuration of
a wireless microphone system 5 according to a first embodiment. The wireless microphone
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system 5 includes a plurality of (for example, m) microphone slaves 2, a master 3 as an example
of a receiver, and a mixer receiver 8. m is an integer of 2 or more. In the following description,
the plurality of microphone handsets 2C1, 2C2,...
[0013]
A wireless signal (for example, a voice signal or a control signal) is transmitted and received
between the microphone slave unit 2 and the master unit 3 through a wireless channel
conforming to the communication standard for time division multiple access (for example, time
division multiplex communication) Be done. When the user (user) of the microphone handset 2
inputs a voice (for example, makes a voice) to the microphone handset 2, the voice signal
collected by the microphone handset 2 is transmitted to the master handset 3 through the
wireless circuit. Ru. In each embodiment, a digital enhanced cordless communications (DECT)
system with a frequency band of 1.9 GHz, which is a standard for digital cordless telephones
formulated in 2011, will be described as a communication standard for time division multiplex
communication. .
[0014]
The base unit 3 shown in FIG. 1 is a comprehensive base unit collectively including base units
WU1, WU2,..., WUk of respective base units (for example, k) capable of receiving audio signals
from each microphone slave unit 2. Although illustrated as a group, the master 3 may be
understood as one master. That is, in the following description, each of the masters WU to Wk
may be replaced with one master 3. k is an integer of 1 or more. In the description of FIG. 1,
there may be cases where the plurality of parent devices WU1 to WUk are referred to as the
parent device WU when they are not particularly distinguished. Based on the audio signal
received by the parent device WU, the voice is outputted and reproduced by a speaker (not
shown) built in the parent device WU, and is also outputted to the mixer receiver 8. The mixer
receiver 8 synthesizes one or more audio signals input from the parent device 3 and outputs an
audio signal after the audio synthesis from the built-in speaker 81 as an audio.
[0015]
FIG. 2 is an explanatory view showing a time slot in which a wireless signal is transmitted and
received between the master unit 3 and the microphone slave unit 2 and an example of change in
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the amount of current flowing through the microphone slave unit 2 for each time slot.
Hereinafter, the time slot is abbreviated as "slot". FIG. 3 is a diagram showing an example of a
frame configuration of a radio signal in DECT communication. A wireless signal is transmitted
and received between the master unit 3 and each microphone slave unit 2 using a predetermined
number (for example, n) of slots determined in accordance with the communication standard
every one frame period. When the communication standard is the DECT system, one frame
period corresponds to 10 ms, and for example, n = 24 slots (ie, 12 slots for downlink and 12 slots
for uplink).
[0016]
In wireless communication using the DECT method (hereinafter referred to as “DECT
communication”), the downlink slot S0 to slot S11 are generally used for communication from
the master 3 to each microphone slave 2 . Uplink slots S12 to S23 are used for communication
from the respective microphone handsets 2 to the base handset 3. In communication between
the master unit 3 and the microphone slave unit 2, slots having a positional relationship of 5 ms
apart corresponding to a half cycle, such as slot S0 and slot S12, slot S1 and slot S13, etc. That is,
they are used in pair slots). The pair slot constitutes one channel (for example, a control channel
for transmitting and receiving control information, a communication channel for transmitting
and receiving an audio signal).
[0017]
In addition, in 12 slots in which transmission is performed from master device 3 to microphone
slave device 2, at least one slot (for example, slot S0) is a control signal including control
information from master device 3 to each microphone slave device 2 Used as a control slot for
sending The control signal is transmitted from the master unit 3 to each microphone slave unit 2
using one of the predetermined number of slots constituting one frame period. If radio wave
interference occurs during transmission of a control signal from the master unit 3 to the
microphone slave unit 2, an empty slot (in other words, an unused slot) may be used as a control
slot. For example, when radio wave interference or the like occurs in the slot S0, the base unit 3
may switch the control slot from the slot S0 to another vacant slot (for example, a switching slot)
and use it. In conjunction with this, the response slot for the control slot (that is, the slot used for
response to the control slot and used for transmission from the microphone handset 2 to the
base handset 3) is the other vacant slot from the slot S12. (For example, another switching slot).
In this manner, the base unit 3 transmits a slot used as a control channel or a communication
channel for each frame period of DECT communication to a radio wave environment between the
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base unit 3 and each of the microphone slave units 2 (in other words, radio waves Dynamically
according to the reception status of For example, in a device such as a cordless phone, in the first
half slots S0 to S11, the master is the transmitting side and the slave is the receiving side, and in
the second half slots S12 to S23, the master is the receiving side and the slave is the transmission
.
[0018]
On the other hand, in the wireless microphone system 5, the master 3 receives an audio signal
transmitted from each of the plurality of microphone slaves 2. Also, the master unit 3 may
transmit a control signal to each microphone slave unit 2 once in one frame period. Therefore, in
the present embodiment, the base unit 3 sets the slots S0 to S11 so that the slots S0 to S11 in the
first half can be used as uplink slots (communication slots) on which the microphone slave unit 2
is on the transmission side. Dynamically decide.
[0019]
For example, master device 3 determines slot S0 in one frame period as a control channel for
sending a control signal, and transmits a control signal to each microphone slave device 2
through this control channel. The control information included in the control signal includes, for
example, system information, slot information, and carrier information. Specifically, the control
information includes, for example, identification information of the microphone handset 2 which
is a communication partner using a carrier and a slot, identification information of the carrier or
slot, a busy state of each slot, and designation of an available empty slot It includes information
such as the number of microphone handsets connected, the wireless error status of the master,
and slot switching due to wireless interference.
[0020]
Each slot constituting one frame of DECT communication is defined by a time width of 416.67
μs (= 10 ms / 24), specifically, a sync signal field, a control bit field, a CRC1 field, a data bit field
and a CRC2 Composed of fields and The synchronization signal field contains fixed data
composed of a data string for bit synchronization and a data string for slot synchronization. The
control bit field contains the control signal described above. When the amount of control
information included in the control signal increases, for example, not only the control bit field but
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a part of the area of the data bit field may be used. The CRC1 field contains a CRC (Cyclic
Redundancy Check) code calculated based on the data string of the control bit field, and is used
for transmission error detection of the control bit field. Data bit fields are used for voice
communication. The CRC2 field contains a CRC code calculated based on the data string of the
data bit field, and is used for transmission error detection of the data bit field.
[0021]
In FIG. 2, in slot S0, master device 3 transmits a control signal to microphone slave device 2.
When the microphone slave unit 2 receives the control signal transmitted from the master unit 3,
the microphone slave unit 2 has the power for driving the receiving circuit of the wireless unit
11 etc. (see FIG. 4) contained therein. Therefore, the amount of current in the microphone slave
unit 2 increases.
[0022]
In the slots S1 and S2, since the microphone slave unit 2 does not perform transmission and
reception operations, only a small current for driving the control unit 10 mainly flows in the
microphone slave unit 2.
[0023]
The slot S3 requires power for driving the transmission circuit of the wireless unit 11 or the like
in preparation for transmission of a wireless signal (for example, an audio signal) in the slot S4,
and the amount of current in the microphone slave 2 increases. .
[0024]
In the slot S4, the microphone handset 2 transmits an audio signal to the master handset 3, so
the microphone handset 2 requires a large amount of power to drive the radio unit 11, the power
amplifier 11A, etc. The amount of current at is the largest in a slot of one frame period.
[0025]
In the slots S5 to S14, since the microphone slave unit 2 does not perform transmission /
reception operations, only a slight current flows in the microphone slave unit 2 as in the slots S1
and S2.
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[0026]
In the slots S15 and S16, since the radio unit 11 and the power amplifier 11A require power in
the same manner as the slots S3 and S4, the amount of current in the microphone slave unit 2
increases, and in the slot S16, one frame is used as in the slot S4. The largest in the slot of the
period.
Thereafter, the same operation is performed.
[0027]
(Hardware Configuration of Microphone Slave Device) FIG. 4 is a block diagram showing an
example of a hardware configuration of the microphone slave device 2.
The microphone slave unit 2 is configured to include a control unit 10, a wireless unit 11, a
power amplifier 11A, a transmission / reception switch 11B, and an antenna 12 connected to the
transmission / reception switch 11B.
[0028]
The control unit 10 is configured using a processor such as a central processing unit (CPU), a
micro processing unit (MPU), a digital signal processor (DSP), or a field programmable gate array
(FPGA). Control the operation.
The control unit 10 outputs a switching signal for switching to transmission or reception of the
radio signal in the transmission / reception switch 11B to the transmission / reception switch
11B.
[0029]
The wireless unit 11 as an example of the wireless communication unit includes a preamplifier
11 z for amplifying the transmission signal at the input stage.
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[0030]
The power amplifier 11A as an example of the wireless communication unit amplifies the
transmission signal amplified by the preamplifier 11z to a predetermined level.
[0031]
The transmission / reception switch 11B as an example of the wireless communication unit
switches, for example, to transmission or reception of a wireless signal transmitted / received via
the antenna 12 in response to a switching signal from the control unit 10.
[0032]
The microphone handset 2 is configured to include the operation unit 13, the display unit 14,
and the memory 15.
[0033]
The operation unit 13 has various buttons as a user interface.
[0034]
The display unit 14 displays setting contents and the like by the operation unit 13.
[0035]
The memory 15 temporarily stores voice data generated by the voice processing unit 18 in
addition to storing various control programs and data for operating the microphone slave unit 2
and data of various setting values.
[0036]
Further, the microphone handset 2 is configured to include a battery 16, a power switch 17, a
power unit 50, an audio processing unit 18, and a microphone 19.
[0037]
The battery 16 is configured by the minimum number of batteries (for example, one battery) that
can operate the microphone slave device 2 according to the first embodiment.
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The battery 16 is a single battery having an output voltage of, for example, 1.0 V to 1.5 V.
The minimum number of batteries is not limited to one battery.
For example, when the microphone slave 2 requires a battery that outputs a voltage of 2.0 V to
3.0 V, conventionally, four batteries are used so that the microphone slave can be started even if
a rush current occurs. It is assumed that
In this case, if two batteries are connected in series, a voltage of 2.0 V to 3.0 V can be output, so
the minimum number of batteries is two.
Also, the battery 16 is, for example, an AA size battery.
The size of the battery is not limited to AA batteries, and may be AA batteries, AA batteries, AAA
batteries, or the like.
The type of battery may be a primary battery such as an alkaline dry battery or a manganese dry
battery, or a secondary battery such as a rechargeable nickel-hydrogen battery or a nickelcadmium battery.
[0038]
The power switch 17 is a switch for turning on or off the power of the microphone slave unit 2
and is operated by the user.
[0039]
The power supply unit 50 applies a battery voltage to each part of the microphone handset 2
which is a load of the battery 16.
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The components of the microphone handset 2 that is the load of the battery 16 are a control unit
10, a wireless unit 11 including a preamplifier 11z, a power amplifier 11A, an audio processing
unit 18, a memory 15, and a display unit 14.
Details of the internal configuration of the power supply unit 50 will be described later.
[0040]
The microphone 19 picks up, for example, the voice emitted by the user.
[0041]
The voice processing unit 18 performs predetermined voice processing on the voice signal
collected by the microphone 19 to generate voice data (voice signal) of voice uttered by the user.
In the audio processing, audio compression, noise removal, and the like are performed.
[0042]
(Power Supply Unit of Comparative Example) First, the power supply unit of the microphone
slave unit, which is a comparative example of the microphone slave unit according to the first
embodiment, will be described with reference to FIG.
FIG. 5 is a diagram showing an example of a schematic configuration of a power supply unit 150
according to a comparative example. In the microphone slave shown in FIG. 5, the configuration
of each part other than the power supply unit according to the comparative example may be the
same as that of the microphone slave according to the first embodiment, and therefore, the same
reference numerals are given.
[0043]
The power supply unit 150 has a DCDC up converter 153 and three constant voltage regulators
157, 158, 159.
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[0044]
The DCDC up converter 153 boosts the voltage (for example, 1.2 V) of the battery 16 to a
predetermined voltage V11 (for example, 3.6 V), and supplies the voltage V11 to the three
constant voltage regulators 157, 158, and 159, respectively.
[0045]
The constant voltage regulator 157 is a low dropout (LDO: Low Dropout) that receives the
voltage V11 of the battery 16 and outputs a voltage V12 (for example, 1.8 V) lower than the
voltage V11 and controls the voltage V12 as a load Apply to 10.
[0046]
The constant voltage regulator 158 is a low dropout (LDO), receives the voltage V11 of the
battery 16 and outputs a voltage V13 (for example, 3.0 V), and applies it to the radio unit 11
which is a load.
[0047]
The constant voltage regulator 159 is a low dropout (LDO), receives the voltage V11 of the
battery 16 and outputs a voltage V14 (for example, 3.3 V), and applies it to the memory 15,
which is a load.
[0048]
Further, the DCDC up converter 153 applies the voltage V11 to the display unit 14 which is a
load without passing through the constant voltage regulator.
[0049]
In the power supply unit 150, when the power is turned on by the power switch 17, rush current
flows from the battery 16 to the DCDC up converter 153.
The inrush current starts to flow when the power is turned on, reaches a peak current value
larger than the steady current value at the beginning of the flow, and then gradually decreases to
reach the steady steady current value.
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For this reason, at the time of rush current, the voltage (battery voltage) of the battery 16
decreases, and the activation condition of the microphone slave (for example, that the battery
voltage is a predetermined value or more) is not satisfied and is assumed.
[0050]
Further, since the DCDC upconverter 153 must amplify the voltage to nearly three times the
input voltage, it is also assumed that the use efficiency of the battery 16 is poor and the life of
the battery 16 is shortened.
When the load is the control unit 10, although the voltage of 1.8 V is required, the input voltage
of the constant voltage regulator 157 is the voltage of 3.6 V, which is considerably higher than
that.
In the constant voltage regulator 157, the difference between the input voltage 3.6 V and the
output voltage 1.8 V is large, and the power loss in performing the constant voltage control is
large, which is not efficient.
[0051]
Further, in time division multiplex communication such as DECT communication, a large current
flows in the wireless unit 11 and the power amplifier 11A at the time of transmission, so that the
battery voltage drops sharply.
For this reason, it is also assumed that the voltage applied to the wireless unit 11 or the control
unit (processor) 10 becomes lower than or equal to the specified voltage, and the processor shuts
down.
[0052]
Therefore, in the first embodiment, the power supply unit 50 is provided which prevents inrush
current due to the power switch being turned on, reduces the power loss, and can supply a large
current at the time of transmission (see FIG. 6).
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[0053]
(Power Supply Unit of First Embodiment) FIG. 6 is a view showing a schematic configuration
example of the power supply unit 50 according to the first embodiment.
The power supply unit 50 includes an inrush current prevention circuit 51, a large capacity
capacitor 52, four DCDC upconverters 53 to 56, and four constant voltage regulators 57 to 59.
When the power switch 17 is turned on, the voltage of the battery 16 is applied to the
microphone slave unit 2.
[0054]
The inrush current prevention circuit 51 as an example of the current suppression unit prevents
a large inrush current from flowing from the battery 16 to the slave unit 2 when the power is on,
and causes the large capacity capacitor 52 to flow the inrush current. The rush current
prevention circuit 51 may be any circuit that limits the amount of current, and may be, for
example, a constant current circuit or a resistor.
[0055]
The large-capacitance capacitor 52 as an example of the current suppression unit is a largecapacity low-loss capacitor having a capacitance capable of storing the current of the rush
current as a charge. When the time from the power-on to the peak current value when the inrush
current is suppressed and the time to reach a stable steady-state current elapses, the large
capacity capacitor 52 is charged to a predetermined voltage (that is, charge is stored) Ru. Then,
the large capacity capacitor 52 can supply current to the DCDC upconverters 53 to 56 in the
subsequent stage with the charged and stable voltage.
[0056]
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The DCDC up converter 53 as an example of the transformer boosts the voltage V1 (for example,
1.2 V) of the battery 16 to the voltage V2 (for example, 2.2 V), and outputs it to the constant
voltage regulator 57. The constant voltage regulator 57 as an example of a transformer is a low
dropout (LDO: Low Dropout), receives the voltage V2 boosted by the DCDC up converter 53, and
receives a voltage V2A applied to the control unit 10 as a load. Voltage control is performed so
that (for example, 1.8 V) becomes constant. The constant voltage regulator 57 is not necessarily
required according to the load requirement (for example, the output of the DCDC up converter
56 is used as it is in the display unit 14). The following description exemplifies the case where a
constant voltage regulator is required.
[0057]
The DCDC up converter 54 as an example of the transformer boosts the voltage V1 (for example,
1.2 V) of the battery 16 to the voltage V31 (for example, 3.3 V), and outputs it to the constant
voltage regulator 58A. The constant voltage regulator 58A as an example of the transformer is a
low dropout (LDO), receives the voltage V31 boosted by the DCDC up converter 54, and is
applied to the radio unit 11 (including the preamplifier 11z) as a load. Voltage control is
performed so that the voltage V31A (for example, 3.0 V) becomes constant.
[0058]
The DCDC up converter 55 as an example of the transformer boosts the voltage V1 (for example,
1.2 V) of the battery 16 to the voltage V32 (for example, 2.8 V), and outputs it to the constant
voltage regulator 58B. The constant voltage regulator 58B as an example of the transformer is a
low dropout (LDO), receives the voltage V32 boosted by the DCDC up converter 55, and is
applied to the power amplifier 11A as a load. • Perform voltage control so that 5 V) becomes
constant.
[0059]
The DCDC up converter 56 as an example of the transformer boosts the voltage V1 (for example,
1.2 V) of the battery 16 to the voltage V4 (for example, 3.6 V), and outputs it to the constant
voltage regulator 59. The constant voltage regulator 59 as an example of the transformer is a
low dropout (LDO), receives the voltage V4 boosted by the DCDC up converter 56, and is applied
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to the memory 15 as a load (for example, 3.V). Voltage control is performed so that 3 V) becomes
constant. Further, the DCDC up converter 56 applies the voltage V4 to the display unit 14 which
is a load without passing through the constant voltage regulator.
[0060]
As described above, in the power supply unit 50 of the microphone slave device 2 according to
the first embodiment, the current supplied from the battery 16 is suppressed by the inrush
current prevention circuit 51 when the power is turned on by the power switch 17 as compared
with the inrush current. The large capacity capacitor 52 is charged with a small inrush current.
When the voltage of the large capacity capacitor 52 becomes close to the voltage of the battery
16, current is supplied to the DCDC upconverters 53 to 56 through the large capacity capacitor
52. Since the inrush current from the battery 16 can be suppressed to a low level, it is possible to
suppress a sharp drop in the battery voltage. In addition, since the voltage of the battery 16 does
not drop suddenly, the start condition of the microphone slave (for example, that the battery
voltage is a predetermined value or more) can be maintained, and the microphone slave will not
start. It can be avoided.
[0061]
Further, since a plurality of DCDC upconverters 53 to 56 are provided which output voltages
corresponding to the voltages applied to the respective loads, the input is input from the
respective DCDC upconverters 53 to 56 to the respective constant voltage regulators 57 to 59.
The difference between the voltage and the output voltage can be reduced. Therefore, it is
possible to suppress the loss of power generated in each constant voltage regulator. Thereby,
highly efficient current supply can be performed for each DCDC upconverter. Further, a power
supply (a set of a DCDC up converter and a constant voltage regulator) is divided by the radio
unit 11 (including the preamplifier 11z) used for radio transmission and the power amplifier
11A. Therefore, the power supply unit 50 can operate the DCDC up converter and the constant
voltage regulator suitable for the wireless unit 11 (including the preamplifier 11z) and the power
amplifier 11A with high efficiency. Therefore, the consumption of the battery can be reduced and
the life of the battery can be extended.
[0062]
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Further, in time division multiplex communication, a large current flows in the wireless unit 11 at
the time of transmission other than the time of entry, but a large amount of charge is stored in
the large capacity capacitor 52. Can be covered by the charge stored in the Thus, the processor
can be prevented from shutting down without the battery voltage dropping sharply.
[0063]
As described above, the microphone slave device 2 according to the first embodiment wirelessly
communicates the collected audio signal to the master device 3. The microphone slave unit 2 is
connected in series with one battery 16 and the battery 16 and controls the rush current
prevention circuit 51 and the large capacity capacitor 52 that suppress the rush current from the
battery 16 and the control unit 10 that is a plurality of loads. , The radio unit 11 (including the
preamplifier 11z), the power amplifier 11A, the memory 15, and the display unit 14 and the
large capacity capacitor 52 are connected in series, and are connected based on the output of the
large capacity capacitor 52. And a set of a plurality of DCDC upconverters 53 to 56 and a
constant voltage regulator 57 to 59 for outputting a voltage according to the load.
[0064]
As a result, the microphone slave device 2 can prevent the rush current from the battery 16 to
the load side when the power switch 17 is turned on even when using one battery 16, and
various loads (for example, the built-in electric circuit) Necessary voltages can be supplied to the
control unit 10, the wireless unit 11, the power amplifier 11A, the memory 15, and the display
unit 114). Therefore, the microphone slave can be driven at a normal current value without a
large current flowing at the time of startup. Therefore, the battery 16 can be used with, for
example, a single AA type battery, and the microphone slave device 2 can improve the handling
when used by the user and improve convenience.
[0065]
Further, the inrush current prevention circuit 51 as an example of the suppression circuit
suppresses the inrush current from the battery 16. A large capacity capacitor 52 as an example
of a capacitor stores a current at the time of inrush from the battery 16 as a charge, and has a
capacity (predetermined capacity) capable of supplying a sufficient current to the subsequent
DCDC upconverters 53, 54, 55, 56 Have. Thereby, when using, for example, a resistor as the
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inrush current prevention circuit 51, it is possible to easily prevent the inrush current simply by
adding a resistor and a large capacity capacitor, and the battery 16 necessary for driving the
microphone slave unit 2 You can reduce the number of
[0066]
In addition, the microphone slave device 2 includes a wireless unit 11 and a power amplifier 11A
that perform wireless communication with the parent device 3 using a time division multiplex
communication method. The wireless unit 11 and the power amplifier 11A use the charge stored
in the large capacity capacitor 52 by the current from the battery 16 to transmit the collected
audio signal to the parent device 3. As a result, the microphone slave device 2 can supply a large
current to the wireless unit 11 and the power amplifier 11A at the time of transmission of
wireless communication even with the use of one battery 16.
[0067]
The DCDC upconverters 53, 54, 55, 56 boost the voltage applied by the battery 16 in accordance
with the connected loads. The constant voltage regulators 57, 58A, 58B, 59 output voltages
necessary for the operation of the connected load to the load based on the output voltages of the
DCDC upconverters 53, 54, 55, 56. Thereby, the difference between the input voltage and the
output voltage of the constant voltage regulators 57 to 59 can be reduced, and the power loss
can be reduced.
[0068]
Second Embodiment In the power supply unit 50 of the microphone handset 2 according to the
first embodiment, the rush current prevention circuit 51 suppresses the rush current flowing
through the large capacity capacitor 52. In the power supply unit 50 of the microphone slave 2
according to the second embodiment, an example in which the current flowing as the rush
current is suppressed to a constant current will be described.
[0069]
The power supply unit 50 of the microphone slave unit 2 according to the second embodiment
has the same configuration as the power supply unit 50 of the microphone slave unit 2 according
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to the first embodiment except for the suppression circuit 60A. The same reference numerals will
be assigned to the constituent elements of to simplify or omit the description.
[0070]
FIG. 7 is a view showing a configuration example of the suppression circuit 60A according to the
second embodiment.
The suppression circuit 60A is configured to include a current suppression circuit 71, an inrush
current prevention circuit 72, and a voltage monitor circuit 73.
[0071]
A current suppression circuit 71 as an example of the first suppression circuit is provided
between the power switch 17 and the large capacity capacitor 52, and controls the current
flowing from the battery 16 to the DCDC upconverter side to a constant current. The current
suppression circuit 71 may be, for example, a constant current circuit, or may be a resistor
having a resistance value (an example of a first impedance) for reducing inrush current.
[0072]
The inrush current prevention circuit 72 as an example of the second suppression circuit is
connected in parallel to the current suppression circuit 71 and has an on / off terminal. The rush
current prevention circuit 72 has a resistance smaller than the resistance value of the current
suppression circuit 71 when the signal from the voltage monitor circuit 73 (that is, the ON / OFF
control signal) input to the on / off terminal is ON. It has a value. On the other hand, rush current
prevention circuit 72 has a resistance value larger than that of current suppression circuit 71
when the signal from voltage monitor circuit 73 (that is, ON / OFF control signal) is OFF. The
inrush current prevention circuit 72 is configured using, for example, a load switch. Since the
inrush current prevention circuit 72 has a higher resistance than the current suppression circuit
71 when the inrush current prevention circuit 72 is off, current flows from the battery 16 to the
large capacity capacitor 52 through the current suppression circuit 71. On the other hand, when
the inrush current prevention circuit 72 is on, the inrush current prevention circuit 72 has a
lower resistance than the current suppression circuit 71, so a current flows from the battery 16
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to the large capacity capacitor 52 through the inrush current prevention circuit 72.
[0073]
The voltage monitor circuit 73 as an example of a monitor circuit monitors (monitors) the voltage
at one end of the large capacity capacitor 52, and when the voltage of the large capacity
capacitor 52 reaches a predetermined constant voltage, the rush current prevention circuit 72 is
used. A signal (ON / OFF control signal) for turning on is output to the inrush current prevention
circuit 72. On the other hand, when the voltage of the large capacity capacitor 52 has not
reached a predetermined constant voltage, the voltage monitor circuit 73 sends a signal (ON /
OFF control signal) for turning off the inrush current prevention circuit 72 to the inrush current
prevention circuit 72. Output. Here, the ON / OFF control signal is a signal for turning on or off
the inrush current prevention circuit 72. The voltage monitor circuit 73 is configured using, for
example, a reset IC. The voltage monitor circuit 73 turns off the inrush current prevention circuit
72 and allows a constant current to flow through the large capacity capacitor 52 until the
electric charge which becomes a constant voltage is stored in the large capacity capacitor 52. It
prevents flowing to 53-56 (refer FIG. 6). In addition, after the charge of a constant voltage is
accumulated in the large capacity capacitor 52, the inrush current prevention circuit 72 is turned
on to smooth the flow of current after the start-up.
[0074]
FIG. 8 is a flowchart illustrating in detail an example of the start-up operation procedure of the
microphone slave device 2 according to the second embodiment.
[0075]
In FIG. 8, when the power switch 17 is off (that is, when the battery 16 and the suppression
circuit 60A do not conduct), the current suppression circuit 71, the rush current prevention
circuit 72, and the suppression circuit 60A of the power supply unit 50. All of the voltage
monitor circuits 73 are in the off state (ST1).
[0076]
The power switch 17 is turned on by the user (ST2).
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21
Normally, it is assumed that the voltage of the large capacity capacitor 52 is lowered when the
power switch 17 is off.
In this case, the voltage monitor circuit 73 outputs an off signal (that is, an ON / OFF control
signal for turning off the inrush current prevention circuit 72) to the inrush current prevention
circuit 72. Since inrush current prevention circuit 72 has a high resistance at the time of off
(OFF), the inrush current from battery 16 generated when power switch 17 is turned on at step
ST2 is large through current suppression circuit 71. It flows to the capacitive capacitor 52 and is
stored as charge (ST3).
[0077]
In the case where the microphone slave unit 2 has been used immediately before, the remaining
charge is accumulated in the large-capacity capacitor 52, and it is also assumed that the voltage
is maintained although the voltage is close to a constant voltage. In this case, even when the
power switch 17 is turned on, no current flows at the time of inrush. The voltage monitor circuit
73 outputs an on signal (that is, an ON / OFF control signal for turning on the inrush current
prevention circuit 72) to the inrush current prevention circuit 72. The inrush current prevention
circuit 72 has a low resistance when turned on (ON), and makes the flow of current from the
battery 16 to the large capacity capacitor 52 smooth.
[0078]
If the voltage of the large capacity capacitor 52 has not reached a constant voltage (ST4, NO), the
voltage monitor circuit 73 waits until the voltage of the large capacity capacitor 52 reaches a
predetermined constant voltage. When the voltage of the large capacity capacitor 52 becomes
equal to or higher than a predetermined voltage (ST4, YES), the voltage monitor circuit 73 sends
an on signal to the inrush current prevention circuit 72 (that is, ON / OFF control for turning on
the inrush current prevention circuit 72). Signal) (ST5). The inrush current prevention circuit 72
has a low resistance when turned on (ST6). Inrush current from the battery 16 is supplied to the
large capacity capacitor 52 through the inrush current prevention circuit 72. When the battery
voltage is applied to the DCDC upconverters 53, 54, 55 and 56 through the large capacity
capacitor 52, the DCDC upconverters 53 to 56 are activated (ST7). When the output voltages of
the DCDC upconverters 53 to 56 are applied to the constant voltage regulators 57, 58A, 58B, 59,
the units of the microphone slave unit 2 operate (ST 8). Further, the output voltage of the DCDC
up converter 56 is directly applied to the display unit 14. As a result, the microphone slave unit 2
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can perform the sound collecting operation.
[0079]
Although steps ST6 and ST7 show cases where the DCDC upconverters 53, 54, 55 and 56 are
turned on after the rush current prevention circuit 72 is turned on, the order may be reversed.
For example, when the operating voltage of DCDC upconverter 53, 54, 55, 56 is lower than that
of other DCDC upconverter 53, voltage monitor circuit 73 generates an off signal (that is, rush
current prevention circuit 72). The DCDC upconverter 53 operates, although the ON / OFF
control signal for turning off remains. Therefore, in step ST7, it is assumed that all DCDC
upconverters 53, 54, 55, 56 are turned on.
[0080]
As described above, in the suppression circuit 60A, the inrush current from the battery 16 is
charged in the large-capacity capacitor 52 through the current suppression circuit 71 until the
voltage of the large-capacity capacitor 52 reaches a predetermined constant voltage. Thereafter,
when the voltage of the large capacity capacitor 52 reaches a constant voltage, the current from
the battery 16 flows through the inrush current prevention circuit 72 and flows through the
large capacity capacitor 52 to the DCDC upconverter side. Therefore, the suppression circuit 60A
can start the microphone slave unit 2 stably. Since the microphone slave operates with a stable
current value, the battery can be used with, for example, one AA battery.
[0081]
In the microphone slave unit 2 according to the second embodiment, the current suppression
circuit 71 has a resistance value for reducing the inrush current, and suppresses the inrush
current from the battery 16. The rush current prevention circuit 72 can be switched to a
resistance value (impedance) higher or lower than the resistance value (an example of the first
impedance) of the current suppression circuit 71, and suppresses rush current from the battery
16. The voltage monitor circuit 73 monitors the voltage due to the charge stored in the large
capacity capacitor 52, and switches the resistance value of the inrush current prevention circuit
72 according to the voltage. The voltage monitor circuit 73 sets the resistance value of the inrush
current prevention circuit 72 to the current suppression circuit 71 when the voltage reaches a
predetermined constant voltage (in other words, it is determined that the charge of the large
11-04-2019
23
capacity capacitor 52 exceeds the predetermined amount). Switch to be lower than the resistance
value of. As a result, the peak current of the inrush current flowing to the large capacity
capacitor 52 when the battery 16 is started (turned on) is suppressed. Therefore, deterioration of
the large capacity capacitor 52 is suppressed, leading to prolonging the life of the component. In
addition, since the value of the current flowing through the microphone handset 2 can be
relatively suppressed to a fixed value or less, it is possible to cope with rapid charging.
[0082]
Third Embodiment In the first embodiment, the rush current preventing circuit 51 suppresses
the rush current flowing through the large capacity capacitor 52. In the second embodiment, the
voltage monitor circuit 73 suppresses the current flowing as the inrush current to a
predetermined constant current, and when the operating voltage is lower as compared to the
others, as in the DCDC up converter 53, the off signal (see above). As it is, the DCDC upconverter
53 is operable. Therefore, there is a time lag when the DCDC upconverters 53, 54, 55, 56 start
up.
[0083]
In the third embodiment, as in the second embodiment, various DCDC up converters 53, 54, 55,
and the like provided in the microphone slave unit 2 while keeping constant the amount of
inrush current when the battery 16 is turned on. An example will be described in which the
microphone slave unit 2 is activated more stably by aligning the timing at which the engine 56 is
activated.
[0084]
The power supply unit 50 of the microphone handset 2 according to the third embodiment has
the same configuration as the power supply unit 50 of the microphone handset 2 according to
the first and second embodiments except for the suppression circuit 60B. The same components
as those in 2 and 3 are denoted by the same reference numerals, and the description thereof will
be simplified or omitted.
[0085]
FIG. 9 is a diagram showing a configuration example of the suppression circuit 60B according to
the third embodiment.
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Similar to the suppression circuit 60A according to the second embodiment, the suppression
circuit 60B includes a current suppression circuit 71, an inrush current prevention circuit 72,
and a voltage monitor circuit 73A.
The voltage monitor circuit 73A outputs an ON / OFF control signal to the rush current
prevention circuit 72, and also outputs an ON / OFF control signal to the DCDC up converters 53
to 56 in the subsequent stage. Here, the ON / OFF control signal output to the inrush current
prevention circuit 72 is a signal for turning on or off the inrush current prevention circuit 72.
Further, the ON / OFF control signal output to the DCDC upconverters 53, 54, 55, 56 is a signal
for turning on or off the DCDC upconverters 53, 54, 55, 56.
[0086]
The DCDC upconverters 53, 54, 55, and 56 each have an on / off input terminal, and when an on
signal (that is, an on / off control signal for turning on the corresponding DCDC upconverter) is
input, Start up and become operational. On the other hand, the DCDC upconverters 53, 54, 55,
and 56 are deactivated when the off signal (ie, the ON / OFF control signal for turning off the
corresponding DCDC upconverter) is input.
[0087]
FIG. 10 is a flowchart illustrating in detail an example of the start-up operation procedure of the
microphone slave device 2 according to the third embodiment. In the description of FIG. 10, the
operations of steps ST1, ST2, ST3, ST4, and ST8 are the same as the start-up operation procedure
(refer to FIG. 8) according to the second embodiment, so the description will be simplified or
omitted. explain.
[0088]
In FIG. 10, voltage monitor circuit 73A turns on each of inrush current prevention circuit 72 and
DCDC up converter 53, 54, 55, 56 when the voltage of large capacity capacitor 52 reaches a
predetermined constant voltage (ST4, YES). A signal (that is, an ON / OFF control signal for
11-04-2019
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turning on each of the DCDC up converters 53, 54, 55, and 56) is output (ST5A). Similar to the
first embodiment, the inrush current prevention circuit 72 has a low resistance when it is on. The
DCDC upconverters 53, 54, 55 and 56 are simultaneously activated by the on signal (see above),
and output voltage (constant voltage) adapted to the input voltage for each of the constant
voltage regulators 57, 58A, 58B and 59. ) Is applied (ST6A). When the output voltages of the
DCDC upconverters 53, 54, 55, and 56 are applied to the constant voltage regulators 57 to 59,
the respective units of the microphone slave unit 2 operate (ST 8). Further, the output voltage of
the DCDC up converter 56 is directly applied to the display unit 14. As a result, the microphone
slave unit 2 can perform the sound collecting operation.
[0089]
As described above, in the suppression circuit 60B, the rush current from the battery 16 is stored
as the charge in the large capacity capacitor 52 before the DCDC upconverters 53, 54, 55, and
56 are turned on. When the DCDC upconverters 53, 54, 55, 56 are simultaneously turned on by
the on signal from the voltage monitor circuit 73A, the inrush current from the battery 16 is
simultaneously supplied to the DCDC upconverters 53, 54, 55, 56. Ru. Therefore, the suppression
circuit 60B can turn on the DCDC upconverters 53, 54, 55, and 56 simultaneously. Compared
with the case where the DCDC upconverters 53, 54, 55, 56 start separately due to the DCDC
upconverters 53, 54, 55, 56 being turned on all at once, although the microphone slave unit 2 is
not started up As a result, unnecessary consumption of power can be suppressed. Also, by
activating the microphone handset 2 in a state where the microphone handset 2 is not
sufficiently charged, the operation of the microphone handset 2 can be suppressed from
becoming unstable, and the microphone handset 2 can be stably started. .
[0090]
In addition, by setting the DCDC up converters 53, 54, 55, and 56 to be in the OFF state before
the charges reaching the constant voltage are stored in the large capacity capacitor 52, the
power consumption can be suppressed until then. In addition, unnecessary power consumption
can be suppressed, and the charging time of the large capacity capacitor 52 can be shortened.
The suppression circuit 60B of the third embodiment may be configured in combination with the
microphone slave according to the first and second embodiments.
[0091]
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As described above, in the slave device 2 according to the third embodiment, the voltage
monitoring circuit 73A determines that the voltage of the large capacity capacitor 52 has
reached a constant voltage (it is determined that the charge stored in the large capacity capacitor
52 exceeds a predetermined amount And DCDC upconverters 53, 54, and 55, and an ON signal
(an example of a start signal for starting each of a plurality of transformers) to turn on the DCDC
upconverters 53, 54, 55, and 56 simultaneously. Output to 55 and 56 respectively. As a result,
the DCDC upconverters 53, 54, 55, 56 can be turned on all at once, the operation of the
microphone slave 2 can be suppressed from becoming unstable, and the microphone slave 2 can
be stably started. Can.
[0092]
Fourth Embodiment In the first embodiment, the rush current preventing circuit 51 suppresses
the rush current flowing through the large capacity capacitor 52. In the second embodiment, the
current flowing as the inrush current is suppressed to a constant current. In the third
embodiment, the loads incorporated in the microphone slave device 2 are simultaneously
activated. In the fourth embodiment, an example will be described in which a plurality of loads
incorporated in the microphone slave device 2 are sequentially activated according to the
priority. For example, a priority (for example, the control unit 10) which takes a long time to start
and become stable is activated first, and a load (for example, the display unit 14) which
immediately starts and stabilizes is activated later. You may decide.
[0093]
Specifically, in the fourth embodiment, the DCDC upconverter 53 for supplying current to the
control unit 10 has the highest priority, and DCDC up for supplying current to the radio unit 11
(including the preamplifier 11z) and the power amplifier 11A. Converters 54 and 55 have the
next highest priority, and DCDC upconverter 56 that supplies current to memory 15 and display
unit 14 has the lowest priority.
[0094]
FIG. 11 is a diagram showing an example of a schematic configuration of a power supply unit
50A according to the fourth embodiment.
11-04-2019
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Power supply unit 50A has substantially the same configuration as power supply unit 50
according to the first embodiment, and includes suppression circuit 60B according to the third
embodiment in place of rush current prevention circuit 51 according to the first embodiment.
The description will be simplified or omitted by attaching the same reference numerals to the
same components.
[0095]
The power supply unit 50A has delay units 84 and 82. The delay unit 84 intervenes in a signal
line connecting the output of the DCDC upconverter 53 and the on / off terminals of the DCDC
upconverters 54 and 55, and turns on the DCDC upconverters 54 and 55 output from the DCDC
upconverter 53. Delay the signal or the off signal. Further, the delay unit 82 intervenes in a
signal line connecting the output of the DCDC upconverter 54 and the on / off terminal of the
DCDC upconverter 56, and the on signal or off of the DCDC upconverter 56 output from the
DCDC upconverter 54. Delay the signal.
[0096]
In the power supply unit 50A, the voltage monitor circuit 73A outputs the on / off signal to the
inrush current prevention circuit 72 and outputs the on / off signal only to the DCDC up
converter 53 in the subsequent stage. The output voltage of the DCDC upconverter 53 is input to
the on / off terminals of the DCDC upconverters 54 and 55 via the delay unit 84 as an on / off
signal. Further, the output voltage of the DCDC up converter 54 is input to the on / off terminal
of the DCDC up converter 56 via the delay unit 82 as an on / off signal.
[0097]
When the voltage of the large capacity capacitor 52 reaches a predetermined constant voltage,
the DCDC upconverter 53 is activated first, then the DCDC upconverters 54 and 55 are activated,
and finally the DCDC upconverter 56 is activated. The DCDC upconverters 54 and 55 supply
current to the radio unit 11 (including the preamplifier 11z) and the power amplifier 11A, so that
the transmission operation in the wireless communication is stabilized by activating
simultaneously.
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[0098]
FIG. 12 is a flowchart illustrating in detail an example of the start-up operation procedure of the
microphone slave device 2 according to the fourth embodiment. In the description of FIG. 12, the
operations of steps ST1, ST2, ST3, ST4, and ST8 are the same as the start-up operation procedure
(refer to FIG. 10) according to the third embodiment. explain.
[0099]
In FIG. 12, when the voltage of the large capacity capacitor 52 reaches a predetermined constant
voltage (ST4, YES), the voltage monitor circuit 73A sends an on signal to the inrush current
prevention circuit 72 and the DCDC up converter 53 (that is, the DCDC up converter 53). (ON /
OFF control signal) for turning on (ST5B). Similar to the first embodiment, the inrush current
prevention circuit 72 has a low resistance when it is on. The DCDC upconverter 53 (an example
of the first DCDC upconverter) is activated by the above-mentioned ON signal, and applies an
output voltage (constant voltage) adapted to the input voltage to the constant voltage regulator
57 (ST6B). In addition, the DCDC upconverter 53 outputs an on signal (that is, an ON / OFF
control signal for turning on the DCDC upconverters 54, 55) to the DCDC upconverters 54, 55
via the delay unit 84 (ST6C) . The DCDC upconverters 54 and 55 (an example of the second and
third DCDC upconverters) are activated by the above-described ON signal, and output voltages
(constant voltages) adapted to the input voltages to the respective constant voltage regulators 57
and 58 respectively Apply. Further, the DCDC upconverter 54 outputs an ON signal (that is, an
ON / OFF control signal for turning on the DCDC upconverter 56) to the DCDC upconverter 56
via the delay unit 82 (ST6D). Note that, instead of the DCDC upconverter 54, the DCDC
upconverter 55 may output an on signal to the DCDC upconverter 56 via a delay unit.
[0100]
The DCDC up converter 56 is activated by the above-mentioned ON signal, and applies an output
voltage (constant voltage) adapted to the input voltage to the constant voltage regulator 59.
Further, the DCDC up converter 56 directly applies the output voltage to the display unit 14
which is a load, without passing through the constant voltage regulator. When the output voltage
of the DCDC up converter 56 is applied to the constant voltage regulator 59, each part of the
microphone slave unit 2 operates (ST8). As a result, the microphone slave unit 2 can perform the
sound collecting operation.
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29
[0101]
As described above, in the power supply unit 50A, the delay devices 84 and 82 are provided, and
the timings at which the DCDC up converters 53 to 56 are activated are shifted to disperse the
current flowing at the time of rushing to the DCDC up converters 53 to 56. Can. Moreover, it is
also possible to arrange the activation of the control unit 10, the wireless unit 11, the power
amplifier 11A, the memory 15, and the display unit 14 which are loads. By unifying the
activation of all the loads, it is possible to suppress the wasteful consumption of power to some
of the loads despite the unstable operation or non-operation of the microphone slave unit.
[0102]
Alternatively, after applying a voltage to the DCDC upconverter 53 and activating the control unit
10 as a load, the voltage may be applied so as to activate the remaining DCDC upconverters 54,
55, and 56 simultaneously. Further, in the power supply unit 50A, the delay devices 84 and 82
are provided to delay the on signal. However, when it takes time to start up the DCDC
upconverter, a delay occurs even if only a plurality of DCDC upconverters are connected in
series. . In this case, it is not necessary to provide a delay, and the delay can be omitted.
Therefore, the number of parts can be reduced and cost increase can be suppressed. Further, the
power supply unit 50A of the fourth embodiment may be configured in combination with the
microphone slave device 2 according to the first and second embodiments.
[0103]
As described above, in microphone slave unit 2 according to the fourth embodiment, the kth (k: 2
to n, n: positive integer indicating the total number of DCDC upconverters) DCDC upconverters
among DCDC upconverters 53 to 56. Starts up after the (k−1) th DCDC upconverter starts up. As
a result, rush current to DCDC upconverters 53 to 56 can be dispersed without rush current to
DCDC upconverters 53 to 56. Therefore, the storage capacity of the battery can be reduced, and
the microphone slave device 2 can be used with a minimum number of batteries, for example,
one battery.
[0104]
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30
As mentioned above, although various embodiments were described, referring to an
accompanying drawing, this indication is not limited to this example. It is obvious that those
skilled in the art can conceive of various modifications, alterations, replacements, additions,
deletions and equivalents within the scope of the claims. It is understood that within the technical
scope of the present disclosure. Moreover, in the range which does not deviate from the meaning
of invention, you may combine each component in various embodiment mentioned above
arbitrarily.
[0105]
The present disclosure is useful as a microphone device that supplies voltages to various loads
that constitute the built-in electric circuit and improves the handling at the time of use to
improve the convenience of the user even with the use of one battery. .
[0106]
2 microphone slave unit 10 control unit 11 radio unit 11A power amplifier 14 display unit 15
memory 16 battery 17 power switch 50 power supply unit 51, 72 rush current prevention
circuit 52 large capacity capacitor 53, 54, 55, 56 DCDC up converter 57, 58A , 58B, 59 Constant
voltage regulator 60A, 60B suppression circuit 71 Current suppression circuit 73 Voltage
monitor circuit
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