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JPH01135207

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DESCRIPTION JPH01135207
[0001]
TECHNICAL FIELD The present invention relates to a power amplifier for driving a speaker or the
like. 2. Description of the Related Art In recent years, the dynamic range of audio signals has
been expanded by digitization of audio equipment, and large output and low distortion are also
desired for speaker systems and power amplifiers. In particular, under the condition 2 where the
battery voltage is limited for vehicles, etc., a method of obtaining a larger output by lowering the
impedance of the speaker is used. Conventionally, a power amplifier as shown in FIG. 2 is used to
drive these low impedance speakers. In FIG. 2, -1 is an input terminal, 2 is an amplifier for
amplifying the power of the input signal, 3 is a low resistance for current detection, 4 is a voltage
amplifier, and 5 is an output terminal. In this conventional power amplifier, a resistor 3 for
detecting a load current of a speaker connected to the output terminal 5 is cascaded to the
output of the amplifier 2, and a voltage generated at the both ends of the resistor 3 is amplified
by the voltage amplifier 4 It feeds back in the reverse phase to the input of the amplifier 2 to
provide a constant current drive power amplifier. Problems to be Solved by the Invention
However, in the configuration shown in this conventional example, there is a problem that the
ratio of the power loss due to the resistor 3 increases and the efficiency decreases as the
impedance of the connected speaker decreases. The SUMMARY OF THE INVENTION In view of
the above problems, the present invention provides a power amplifier without power loss even
for a low impedance speaker. Means for Solving the Problem In order to achieve this object, the
power amplifier of the present invention comprises an amplifier for amplifying an input acoustic
signal and a superconductive conductor wound around the output line of the amplifier and
detecting the current of the output line. It comprises a coil made of a material and a currentvoltage converter which receives the output of the coil and feeds back the output in reverse
phase to the input of the amplifier. Operation With this configuration, the output current of the
amplifier can be detected without any loss by the superconducting coil, and the detected current
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can be converted into a voltage signal by the current-voltage converter and fed back to the
amplifier, thereby driving a low impedance speaker. Can realize a low loss power amplifier.
Embodiment An embodiment of the present invention will be described with reference to the
drawings. FIG. 1 shows the configuration of a power amplifier according to an embodiment of the
present invention. In FIG. 1, 7 is a superconducting carp / I / 6 wound on one power output line
of the power amplifier 2 is a current-voltage converter. Reference numeral 1 is an input terminal,
2 is an amplifier, and 5 is an output terminal. These are the same as the configuration of the
conventional example.
The operation of the power amplifier configured as described above will be described below.
First, a detection current proportional to the output current of the amplifier 2 can be obtained
without a power loss by the superconducting coil / I / 7 wound around the power output line of
the amplifier 2. Next, the detected current is converted into a voltage of an appropriate
magnitude by the current-voltage converter 6, and is added in reverse phase to the input of the
amplifier 2, and feedback is applied to make the output current of the amplifier 2 constant.
Therefore, the low impedance speaker connected to the output terminal 5 can be driven. Effects
of the Invention As described above, according to the present invention, the output current of the
power amplifier can be detected 5 to 7 by the superconducting carp / I / 7 without power loss,
so a low loss constant current output power amplifier is realized. it can.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the configuration of a power amplifier according to an
embodiment of the present invention, and FIG. 2 is a block diagram of a conventional power
amplifier.
1······················································································
· · · · · · · · · · · · · · · · · · · · · · · · · · · superconducting coils . Name of agent Attorney Nakao Toshio
Other 1 person Figure 1
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