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(A) Industrial Application Field The present invention relates to a power consumption efficient
amplifier circuit. (B) Prior Art FIG. 1 shows a conventional 5 EPP amplifier circuit with an OC
(OUTPUT CODENDERS). (1) and (2) are a left channel signal input terminal and a right channel
signal input terminal, respectively. By the way, the input signal of the audio amplifier is a low
frequency signal 8 (audio frequency signal), and the left channel signal (L) and the right channel
signal (R) are often in phase. Therefore, when a positive half cycle signal is input to such a 5EPP
amplifier circuit (3) <4), a current loop as shown by a solid line (IL1) (IRI) is formed. Therefore,
the smoothing capacitor (6) on the secondary side of the power supply circuit (5) needs a large
capacity, and if the output of the audio signal (L) (R) is to be amplified to about 20 Hz, the power
supply circuit (5 Although it depends on the design of the transformer), a capacity of about 10 °
000 μF is required. In addition, if amplification is attempted to about 20 Hz without increasing
the capacity of the smoothing capacitor (6), the power supply voltage must be increased. As
described above, if the power supply voltage is improved or the capacity of the smoothing
capacitor (6) is increased, it is sufficient for audio output at 20 Hz, but there is an allowance for
1000 I (audio output at z. Such a large cost in the capacity required by the frequency makes it
commercially inefficient. (C) Object of the Invention The present invention has been made in view
of the above-mentioned problems, and provides a power supply circuit which improves the
utilization efficiency of the power supply and which requires a relatively small capacity
smoothing capacitor, Provides an amplifier circuit capable of obtaining The present invention is
configured to invert one of the left channel signal and the right channel signal. (E) Embodiment
FIG. 2 is a circuit diagram of an amplification circuit obtained by implementing the present
invention J. The same components as in FIG. 1 are assigned the same reference numerals. 9) is a
5EPP amplification circuit for amplifying the left channel @ No. 6) is an operational amplifier in
which a feedback element (73) is connected to the inverting input terminal (to), and an output
capacitor (C +) The resistor (RL) is grounded in series. ("Is the right channel (i14 (R> is a 5EPP
amplification circuit that amplifies" 4 ") is an operational amplifier whose feedback element (f3)
is connected to the inverting input terminal (→), between its output end and ground) The output
capacitor (C2) and the load resistance (RR) are connected in series.
The non-inverted input terminal (1-) Q of the 5EPP amplifier circuit (4) receives the right channel
signal (R) via the inverter 17 and works. ! Reference numeral 5+ is a power supply circuit, which
comprises an AC power supply input terminal, a double-f Aodo rectifier circuit (s +), and a
smoothing capacitor 00), and the positive side of the smoothing capacitor (b) is a power supply
terminal of the operational amplifier 6υIAI. , The negative side is the operational amplifier (31)!
41)-The power supply terminal is connected between the connection point of the load resistance
(RL) (RR) and the ground. The operation of the present invention having such a configuration will
be described. Now, the left channel (il $ 9 (L) and right channel signal (R) in phase positive cattle
cycle signals are input to the left channel signal input terminal (1) and the right channel signal
input terminal (2). Then, since the positive left channel No. d (L) is amplified by the op amp 1),
the solid current (IL +) loop shown in FIG. 2 is formed, and the power is load (RL) from the
smoothing capacitor @ 0). Supplied to By the way, since the right channel signal +) (R) is inverted
by the inverter (7) and converted into a negative half cycle, the output of the operational
amplifier '41) becomes a negative potential and the charge stored in the output capacitor (C2) is
a load It is released 71 j to resistance (RR) to form a military loop (IRI). Therefore, at this time,
the power supplied to the load resistance (RR) K is not the smoothing capacitor @ 0) but the
power of the output capacitor (C2), so 珀 11N of the smoothing capacitor @ 0 is of the left
channel signal (L) It will only be a burden. In the negative half cycle of the left channel signal (L)
and the right channel channel-(R), as shown by the dotted line, the discharge current loop (RL2)
of the output capacitor (C1) and the smoothing capacitor (6 (]) K Becomes a current loop (IR2),
jF? The burden on the i7 Condenser is lightened. By the way, load at this time (R1? The power of
reverse phase is supplied to the), but the @ load (RR) actually connected is the speaker, so as
shown in FIG. 6, the ■ and θ terminals of the speaker (8) are reversed. Connect if it's 17-I. (E)
Effects of the Invention As described above, according to the present invention V, it is simple
because only the inverting circuit for inverting the phase of one channel signal among the
channel signals of half of the capacity pair of the conventional power supply is provided. Still,
with battery operation, the peak value of the current consumption is only half that of the
conventional one, so the battery life is extended.
Brief description of the drawings
FIG. 1 is a diagram showing an amplifier circuit comprising a conventional 5EPP amplifier circuit
with OC, FIG. 2 is a diagram showing an amplifier circuit according to the present invention, and
FIG. 6 is a diagram provided for detailed explanation of the present invention.
(1) ... left channel signal terminal, (2) ... right channel turn terminal, (3) (4) ... 5 EPP amplification
circuit, (5) ... power supply circuit, (7) ... -Inverter (inverting circuit),---smoothing capacitor. Figure
1 Figure 3