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DESCRIPTION JPS5341275

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DESCRIPTION JPS5341275
Specification 1, Title of the Invention Power detection device t The output signal of the amplifier
at the input of the Hall element. Prior to placing the Hall element in the magnetic field of the coil
to which the signal current 7 current is supplied. A power detection device for detecting the
output power of the amplifier. . 2 The coil is connected to the output terminal of the amplifier.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a power detection device
for detecting the output power of an amplifier. A low frequency power amplifier, such as a sound
reproduction device, is provided with a power detection device that displays the output signal
level and detects the output power to protect the load. Applied to the speaker in the audio power
amplifier! Conventional J-force test to detect and display force , The hanging device is shown in
FIG. In FIG. 1, reference numeral 3 denotes an audio power amplifier provided with a feedback
circuit of a resistor 4.5 and a capacitor 6, and a coupling capacitor 1 and a resistor 2 are
connected to the input terminal thereof. The speaker 9 is connected to the output terminal
through the coil 8 for preventing parasitic vibration and the resistor 7. ま。 Directly between the
connection point of the coil 8 and the speaker 9 and the ground. Two resistors 10.11 connected
in series are connected, and the anode of the rectifying diode 12 is connected to the connection
point of the resistors 10.11 (a capacitor is connected to a cathode of the diode 12). A sensor 15
is connected, and an indicator 14 for indication is connected. Then, the output of the amplifier 3
is divided by 2 (a resistor 10.11 of lii, taken out, rectified by a diode 12, smoothed and supplied
to an instrument 14 to display an output signal level. Since this circuit detects the output voltage
of the amplifier 3, the power actually applied to the speaker 9 is different if the nominal
impedance of the speaker 9 is different even if the indicated value of the meter 14 is the same.
Become. Normally, the speaker's nominal impedance is often EndPage: 14 Ω and 80. However,
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the display section of the meter needs to display power for 4 Ω and 80 for the display part of the
meter. Also, even if the nominal impedance is 80 speakers, the actual impedance of the speaker
varies with the frequency of the signal supplied to it, and the frequency / impedance
characteristics thereof are not constant. For this reason, for example, even if the power display
converted to 8 Ω is described on the display unit of the meter, the power displayed by the meter
14 has a disadvantage that it differs from the power actually supplied to the speaker 9. The
present invention does not have the disadvantages of the prior art, and provides a power
detection device that truly detects the power applied to the load regardless of the load
impedance. The present invention utilizes a Hall element as a multiplier, . Detects the voltage and
current of the audio power amplifier output terminal. To determine the power applied to the
load. . The power detection apparatus according to the present invention is shown in FIG. This
will be described according to a first embodiment. Referring to FIG. 2, the output terminal 1 of
the power amplifier 3 is connected to the speaker 9 through a coil 8 for preventing parasitic
vibration and a resistor 7 connected in parallel thereto.
A resistor 16 and a variable resistor 15 connected in series are connected to a connection point
of the coil 8 and the speaker 9, and the variable resistor 15 is connected to one input terminal of
the Hall element 17. The ball element 17 is disposed in the vicinity of the coil 8 and is a coil.
Under the influence of the magnetic field of 8, the other input terminal is grounded, and the pair
of output terminals are connected to the amplifier 190 input terminal through the resistor 18.
The amplifier 19 is a normal amplifier fed back by a resistor 20, and its output terminal passes
through the smoothing capacitor 21 to the meter 14. It is connected. The output signal of the
amplifier 5 in such a device. Is supplied to the speaker 9 through the coil 8 and the resistor 7 and
a magnetic field is generated in the coil 8 by this signal current. The magnetic field is applied to
the Hall element 17. Further, the output signal of the amplifier 3 is taken out by the resistor
15.16, supplied to the Hall element 17, and the Hall element 17. The flow is flowing. Further,
since the Hall element 17Fi and the parasitic vibration preventing coil 80 are disposed near each
other, they are influenced by a magnetic field proportional to the output current of the amplifier
3. Therefore, the output of the Hall element 17. At the terminals, a voltage proportional to the
product of the output voltage of the amplifier 3 and the output current can be obtained. That is, a
voltage proportional to the power applied to the speaker 9 is obtained at the output terminal of
the Hall element 17. This voltage is amplified by the amplifier 19, and the 0 resistance 16 and
the variable resistance 15 applied to the meter 14 limit the current flowing to the input terminal
of the Hall element 17. In particular, the variable resistance 15 is the Hall element 17. I live by
what adjusts the input current of. The inductance of the parasitic vibration preventing coil 8 is
usually 2 to 3 μH, and the resistance 7 is 10 to. Most of the audio signal is about -20 ohms.
Flows through the eight. In addition, the condenser 21 controls the falling time of the pointer of
the meter 14 °. . Thus, according to the detection device of the present invention, the number
increases. 4. to detect the voltage and current of the output signal of the amplifier ,. The true
output power of the amplifier can be detected and the power delivered to this load can be
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detected even if the impedance of the load changes. In the embodiment, a case where it is used
for a display device for displaying the detected power by a meter is described, and Sparrow trains
the load protection circuit with the output of the Hall element. Control, and control the film
formation and control of the amplifier itself. ができる。
4. Brief Description of the Drawings FIG. 1 is a circuit diagram 1 of a conventional power
detection device, and FIG. 2 shows an embodiment of the power detection device according to
the present invention. It is a circuit diagram. 3: Power amplifier 8: Parasitic vibration prevention
coil 9: Speaker 14: Instrument 17: Hall element 19: Amplifier y ',' A. 2 Figure EndPage: 3
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