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JPH11317629

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DESCRIPTION JPH11317629
[0001]
FIELD OF THE INVENTION The present invention relates to a system such as a television receiver
using a class D amplifier.
[0002]
2. Description of the Related Art Japanese Patent Laid-Open Publication Nos. 5-160649, 6303049 and 6-216664 disclose arrangements for securing the performance when a class D
amplifier is used alone. As described above, in a system using a class D amplifier such as a
television receiver, PWM modulation (pulse width modulation) generated from the class D
amplifier is performed in a system using a class D amplifier such as a television receiver.
Consideration must be given to disturbances because the fundamental wave components and
harmonics components affect other circuits in the vicinity as disturbances. In particular, when
two or more class D amplifiers are used as audio amplifiers to reproduce stereo broadcasting,
each class D amplifier generates an oscillation fundamental frequency wave of the PWM signal as
a disturbance wave, and the oscillation fundamental frequency waves cause interference with
each other. There is a problem that the interference wave is superimposed as an interference
wave on the sound output itself, and an interference component can be heard from the sound.
[0003]
When a class D amplifier is used as an audio amplifier in a television receiver, the maximum
value of the audio frequency is as high as 20 kHz, so the fundamental frequency for PWM
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modulation used in the class D amplifier needs to be 100 kHz or more in practical use. Thus, the
harmonic components extend to the television video frequency band, and thus there is a problem
that when a class D amplifier is used, video interference appears.
[0004]
Heretofore, the study for solving the problem due to the disturbance generated from the class D
amplifier is not sufficient, and in order to eliminate the influence due to the disturbance, the class
D amplifiers are individually shielded one by one with a shield case or the like. The method was
common.
[0005]
However, there still remains the problem that the countermeasure against the disturbance in the
system using the conventional class D amplifier is not sufficient.
[0006]
The present invention is intended to solve such a problem, and it is an object of the present
invention to eliminate the influence of an interference wave generated from a class D amplifier in
a system using a class D amplifier.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, a system using a class D
amplifier according to the present invention has fundamental wave components generated
simultaneously by two class D amplifiers for PWM modulation of an input signal. The
interference wave generated by interference between the oscillation fundamental frequency
waves caused by interference between the oscillation fundamental frequency waves is a
frequency band that can not be used by circuits, devices, LSIs, etc. Even if two Class D amplifiers
are used simultaneously, an adverse effect appears because the interference waves due to the
interference of the oscillation fundamental frequency waves are in a frequency band that can not
be used by the subsequent devices. It will not be.
[0008]
Further, a system using the class D amplifier of the present invention is obtained by magnetically
shielding a coil used as an inductor component of an LC filter used in the class D amplifier, so
that the magnetism generated inside the coil is not leaked to the outside By doing this, it is
possible to eliminate the adverse effect of the interference wave generated from the circuit using
the class D amplifier.
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[0009]
Further, the system using the class D amplifier of the present invention is a system in which the
LSI incorporating the class D amplifier itself is coated with a magnetic shield material, and the
adverse effect due to the interference wave generated from the LSI incorporating the class D
amplifier is eliminated. It is a thing.
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the
present invention is an oscillation fundamental frequency wave of fundamental wave
components simultaneously generated by two class D amplifiers for PWM modulation of an input
signal. Class D amplifier is set so that the interference wave generated by interference between
frequency waves becomes a frequency band that can not be used by circuits, devices, LSIs, etc.
connected downstream of that class D amplifier. The system used is that no adverse effects
appear even if two Class D amplifiers are used simultaneously because the interference waves
due to the interference of the oscillation fundamental frequency waves are in a frequency band
that can not be used by the post-stage devices. Have.
[0012]
According to the invention of claim 2 of the present invention, assuming that the oscillation
fundamental frequencies of the fundamental wave components generated by the two class D
amplifiers are f1 and f2, and the frequency band available to the post-stage device is B1, f1 and
The system using the class D amplifier according to claim 1, wherein the difference of f2 is set to
be larger than B1, the modulation wave frequency f1 of the first class D amplifier and the
modulation wave of the second class D amplifier Interference due to interference between the
modulation wave frequency f1 of the first class D amplifier and the modulation wave frequency
f2 of the second class D amplifier by making the difference with the frequency f2 larger than the
usable frequency band B1 of the post-stage device Since the frequency is in a frequency range
higher than B1, even in the case where two class D amplifiers are operated at the same time,
there is an effect that the post-stage device is not affected by the interference due to the
interference of the modulation wave frequency.
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[0013]
The invention according to claim 3 of the present invention is a system using the class D
amplifier according to claim 2, wherein two class D amplifiers are incorporated in one LSI, and
the two class D amplifiers are Even in the case of being incorporated in the same package of one
LSI and operated simultaneously, it has an effect that the post-stage device is not affected by the
interference due to the interference of the modulation wave frequency.
[0014]
The invention according to claim 4 of the present invention is characterized in that the oscillation
fundamental frequencies f1 and f2 of fundamental wave components simultaneously generated
by two class D amplifiers for PWM modulation of the input signal are equalized, This is a system
using a class D amplifier in which the amplifier is built in one LSI, and the modulation wave
frequency f1 of the first class D amplifier and the first class D amplifier are set by setting the
relationship between the respective modulation wave frequencies to f1 = f2. Interference with the
modulation wave frequency f2 of the two class D amplifiers is reduced, and even when two D
class amplifiers built in the same package are operated at the same time, the influence of
interference by the interference of the modulation wave frequency on the post-stage device Have
the effect of not receiving
[0015]
The invention according to claim 5 of the present invention uses two systems using the class D
amplifier according to claim 4 and generates oscillations of fundamental wave components
generated by two class D amplifiers in each LSI. Assuming that the fundamental frequency is f1
and f2 for each LSI, and the usable frequency band of the rear stage device of the class D
amplifier is B1, the class D amplifier is used in which the difference between f1 and f2 is set to be
larger than B1. Since the system is a system where the interference frequency due to the
interference between the modulation wave frequency f1 of the first LSI and the modulation wave
frequency f2 of the second LSI is in a frequency range higher than B1, two LSIs are in the same
system. Even when the class D amplifier is operated at the same time by arranging them, there is
an effect that the post-stage device is not affected by interference due to the interference of the
modulation wave frequency.
[0016]
The invention according to claim 6 of the present invention combines a system using the class D
amplifier according to claim 4 and a class D amplifier one by one and uses the class D amplifier
according to claim 4 The oscillation fundamental frequency of the fundamental wave component
generated by the class D amplifier in the system is f1, the oscillation fundamental frequency of
the fundamental wave component generated by the other class D amplifier combined is f2, and A
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4
system using a class D amplifier in which a difference between f1 and f2 is set to be larger than
B1 when an available frequency band is B1, a system using the class D amplifier according to
claim 4 Because the interference frequency due to the interference between the modulation wave
frequency f1 of LSI and the modulation wave frequency f2 of class D amplifier in the above is in
the frequency range higher than B1, the LSI and the class D amplifier in the same system Also
succeeding apparatus when it is operated by closely spaced simultaneously has the effect that is
not affected by the disturbances due to interference of the modulating wave frequency.
[0017]
The invention according to claim 7 of the present invention comprises a signal output source, a
class D amplifier, an integrator for integrating the PWM output of the class D amplifier, and a
regeneration device, the integrator comprising a class D amplifier and a regeneration device And
an LC filter consisting of a coil inserted in series between the coil and a capacitor inserted
between the connection point of the coil and the reproducing device and the ground, and the coil
is a magnetic shield that does not leak the generated magnetic component to the outside A
system using a class D amplifier in which the pulse modulation wave frequency is generated from
a system using a class D amplifier by using a magnetic shield type coil that does not leak the
magnetic component generated from the coil to the outside. Has the effect of reducing
interference such as harmonic components of the clock signal and harmonic components of the
clock signal.
[0018]
The invention according to claim 8 of the present invention is an LSI comprising a class D
amplifier, an LSI incorporating a signal output source and a class D amplifier, an integrator for
integrating the PWM output of the class D amplifier, and a reproduction device. Is a system that
uses a class D amplifier that uses a magnetic shield material that does not leak magnetic
components generated from the inside of the LSI as the package material that covers the
package, and harmonics of the pulse modulation wave frequency generated from the circuit that
uses the class D amplifier It has the effect of reducing disturbances such as components and
harmonic components of the clock signal.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
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(First Embodiment) FIG. 1 is a system configuration diagram of a system using a class D amplifier
according to a first embodiment of the present invention, and 1 outputs a signal having a
constant frequency band B0, such as an audio signal. A first signal output source, 2 amplifies and
amplifies the input signal from the first signal output source 1 by PWM modulation with a clock
of a modulation wave frequency f1 sufficiently high in frequency compared to B0. The first class
D amplifier for outputting a PWM wave, 3 integrates the output signal from the first class D
amplifier 2 and operates clock component of the modulation wave frequency f1 of the first class
D amplifier 2 and the modulation The reproduction device 4 reproduces the output signal from
the first integrator 3 in a first integrator for attenuating the harmonic components of the wave
frequency f1 and the frequency components of the reproduction frequency band B1 or more of
the reproduction device 4 It has an action.
[0020]
Also, 5 is a second signal output source that outputs a signal having a constant frequency band
B0, such as an audio signal, for example. 6 is sufficient to compare the input signal from the
second signal output source 5 with B0. And a second class D amplifier for outputting a PWM
wave amplified and amplified by a clock of the modulation wave frequency f2 having a high
frequency, and 7 integrates the output signal from the second class D amplifier A second
integrator for attenuating an operating clock component of the modulation wave frequency f2 of
the second class D amplifier 6, a harmonic component of the modulation wave frequency f2 and
a frequency component over the reproducible frequency band B1 of the reproduction device 8
The reproduction device 8 has the function of reproducing the output signal from the second
integrator 7.
[0021]
Here, the difference between the modulation wave frequency f1 of the operation clock of the first
class D amplifier 2 and the modulation wave frequency f2 of the operation clock of the second
class D amplifier 6 is the reproduction of the reproduction device 4 and the reproduction device
8. The modulation wave frequency f1 and the modulation wave frequency f2 are selected to be
larger than the possible frequency band B1, and even if the modulation wave frequency f1 and
the beat component of the modulation wave frequency f2 are generated as interference
components, the reproduction device 4 and the reproduction It has the effect that the
interference component is not regenerated from the device 8.
[0022]
In the above system configuration, specifically, for example, the first signal output source 1 and
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the second signal output source 5 are audio signal controllers, and the reproduction device 4 and
the reproduction device 8 are speakers.
At this time, generally B0 = B1.
[0023]
In another example, the first signal output source 1 and the second signal output source 5 are
deflection signal generators, and the reproduction device 4 and the reproduction device 8 are
deflection coils.
At this time, in general, B0 = B1 is not limited.
[0024]
(Second Embodiment) FIG. 2 is a system configuration diagram of a system using a class D
amplifier according to a second embodiment of the present invention, and 9 outputs a signal
having a constant frequency band B0, such as an audio signal. A first signal output source, 10 is
a second signal output source that outputs a signal having a constant frequency band B0, for
example, an audio signal, 11 is an internal two first class D amplifier 12 and a second A class D
amplifier 13 is built in, the input signal from the first signal output source 9 is amplified by the
first class D amplifier 12, and output as an amplified PWM signal, and at the same time, the
second signal output This is an LSI that amplifies the input signal from the source 10 with the
second class D amplifier 13 and outputs it as an amplified PWM signal.
Here, the first class D amplifier 12 amplifies and amplifies the input signal from the first signal
output source 9 with the clock of the modulation wave frequency f1 whose frequency is
sufficiently high compared to B0. The second class D amplifier 13 modulates the frequency of
the input signal from the second signal output source 10 sufficiently higher than that of B0.
There is an action of outputting a PWM wave which is PWM-modulated and amplified by a clock
of the wave frequency f2 and amplified.
14 integrates an output signal from the first class D amplifier 12 built in the LSI 11, and operates
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an operating clock component of the modulation wave frequency f1 of the first class D amplifier
12 and a harmonic component of the modulation wave frequency f1 and A first integrator for
attenuating frequency components above the reproducible frequency band B1 of the reproducing
device 15. A first integrator 16 integrates the output signal from the second class D amplifier 13
built in the LSI 11, and the second class D A second integrator for attenuating an operating clock
component of the modulation wave frequency f2 of the amplifier 13, a harmonic component of
the modulation wave frequency f2 and a frequency component of the reproduction frequency
band B1 or more of the reproduction device 17; The function of reproducing the output signal
from the first integrator 14 and the function of reproducing the output signal from the second
integrator 16 .
[0025]
Here, even if the LSI 11 incorporates two of the first class D amplifier 12 and the second class D
amplifier 13 in the same package, the LSI 11 operates as an operating clock for the first class D
amplifier 12 contained therein. The modulation wave frequency f1 is set so that the difference
between the modulation wave frequency f1 and the modulation wave frequency f2 of the
operation clock of the second class D amplifier 13 is larger than the reproducible frequency band
B1 of the reproduction device 15 and the reproduction device 17. Even if the modulation wave
frequency f2 is selected and the beat components of the modulation wave frequency f1 and the
modulation wave frequency f2 are generated as interference components, the interference
components are not reproduced from the reproduction devices 15 and 17.
[0026]
In the above system configuration, specifically, for example, the first signal output source 9 and
the second signal output source 10 are audio signal controllers, and the reproduction device 15
and the reproduction device 17 are speakers.
At this time, generally B0 = B1.
[0027]
In another example, the first signal output source 9 and the second signal output source 10 are
deflection signal generators, and the reproduction device 15 and the reproduction device 17 are
deflection coils.
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At this time, in general, B0 = B1 is not limited.
[0028]
(Third Embodiment) FIG. 3 is a system configuration diagram of a system using a class D
amplifier according to a third embodiment of the present invention, showing a system
configuration diagram of a system using a class D amplifier according to the second embodiment.
The only difference from FIG. 2 is that the modulation wave frequency of the first class D
amplifier 12 and the modulation wave frequency of the second class D amplifier 13 become the
same f1, and the other configuration is the same as FIG. is there.
[0029]
In the above configuration, even if the LSI 11 incorporates two of the first class D amplifier 12
and the second class D amplifier 13 in the same package, the LSI 11 can use the operation clock
of the first class D amplifier 12 contained therein. Since the modulation wave frequency f1 and
the modulation wave frequency f1 of the operation clock of the second class D amplifier 13 are
equal to each other, no beat component due to the modulation wave frequency f1 and the
modulation wave frequency f1 is generated as an interference component. And 17 have the
effect that the interfering component is not regenerated.
[0030]
(Fourth Embodiment) FIG. 4 is a system configuration diagram of a system using a class D
amplifier according to a fourth embodiment of the present invention, which comprises two
systems, system 18 and system 19, and in systems 18 and 19 The configuration is the same as
that of FIG. 3 which is a block diagram of a system using a class D amplifier in the third
embodiment, and the modulation wave frequency f1 is the same as that of the two class D
amplifiers 12 and 13 in the system 18. The difference from the modulation wave frequency f2
having the same value of the two class D amplifiers 12 and 13 in the system 19 is larger than the
reproducible frequency band B1 of the reproduction device 15 and 17, and the four input signal
sources 9, 10, 9 , 10 are amplified by the four class D amplifiers 12, 13, 12, 13, even if the beat
components of f1 and f2 are generated as interference components, Interfering components from
15,17,15,17 has an effect that does not play.
[0031]
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Further, since the modulation wave frequency f1 of the two class D amplifiers 12 and 13 in the
system 18 is equal, the beat component due to the modulation wave frequency f1 and the
modulation wave frequency f1 does not occur as an interference component, and the
reproduction devices 15 and 17 disturb Having the effect that the component is not regenerated
is the same as in the third embodiment.
The same applies to the system 19.
[0032]
(Fifth Embodiment) FIG. 5 is a system configuration diagram of a system using a class D amplifier
according to a fifth embodiment of the present invention, which comprises two systems, a system
20 and a system 21. 3 is the same as FIG. 3 showing a system configuration diagram of a system
using a class D amplifier in No. 3 and the system 21 is a system configuration diagram of a
system using a class D amplifier in the first embodiment; The configuration is the same as that of
the output source 1, the first class D amplifier 2, the first integrator 3, and the reproduction
device 4.
[0033]
Here, the difference between the modulation wave frequency f1 of the two class D amplifiers 12
and 13 of the system 20 and the modulation wave frequency f2 of the class D amplifier 2 of the
system 21 is the reproducible frequency band B1 of the reproducing devices 4, 15 and 17. In the
case where the signals from the three input signal sources 1, 9 and 10 are amplified by the class
D amplifiers 2, 12 and 13, the beat components of the modulation wave frequency f1 and the
modulation wave frequency f2 are generated as interference components. Even in this case, the
interference component is not reproduced from the reproduction devices 4, 15, 17.
[0034]
Also, as a matter of course, in the system 20, since the modulation wave frequencies f1 of the
two class D amplifiers 12 and 13 are equal, no beat component due to the modulation wave
frequency f1 and the modulation wave frequency f1 is generated as an interference component.
It also has the effect that the interfering components are not regenerated from the regeneration
devices 15 and 17.
[0035]
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Sixth Embodiment FIG. 6 is a system configuration diagram of a system using a class D amplifier
according to a sixth embodiment of the present invention, and is a diagram showing a system
configuration using a class D amplifier according to the first embodiment. The first integrator 3 is
the same as the configuration including the first signal output source 1 of FIG. 1, the first class D
amplifier 2, the first integrator 3 and the reproduction device 4, and the first integrator 3 is the
first class D An LC filter is constituted by a coil 22 inserted in series between the amplifier 2 and
the regeneration device 4 and a capacitor 23 inserted between the connection point of the coil
22 and the regeneration device 4 and the ground.
The coil 22 is a component magnetically shielded with a ferrite resin or a silicon plate in order
that its winding and core prevent leakage flux to the outside of the component, and used in the
integrator 3 for integrating a PWM wave having a large current Thus, the magnetism generated
when current flows through the coil 22 is prevented from leaking to the outside of the
component, and the influence of the leakage flux on other electronic circuits, interference or
interference is prevented.
[0036]
Seventh Embodiment FIG. 7 is a system configuration diagram of a system using a class D
amplifier according to a seventh embodiment of the present invention, and is a diagram showing
a system configuration using a class D amplifier according to the first embodiment. It is the same
as the configuration including the first signal output source 1 of FIG. 1, the first class D amplifier
2, the first integrator 3 and the reproduction device 4, and the first class D which generates a
large PWM wave. The amplifier 2 is built in the LSI, and the whole LSI is magnetically shielded by
a package material 24 made of a ferrite resin or a magnetic plate made of a silicon plate so that
the magnet generated by the class D amplifier 2 itself is not leaked to the outside of the
components. Prevents the leakage of the magnetism generated when the class D amplifier 2
operates and the current flows to the outside of the component, and the influence, interference
or interference to other electronic circuits due to the leakage flux Having an iodine.
[0037]
As described above, according to the present invention, it is possible to provide a system using a
class D amplifier which reduces interference caused by using a class D amplifier.
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