| 摘要 |
PROBLEM TO BE SOLVED: To realize stable output voltage and current balance in an output voltage variable power supply which can vary the output voltage. SOLUTION: This power supply comprises a pulse width control circuit 1 for controlling on and off conditions of a switching transistor Q1, a voltage detecting unit 2 for detecting an output voltage Vout, a current detecting unit 3 for detecting a current, an arithmetic amplifier 5 for outputting a difference between a current detection value by the current detecting unit 3 and a current detection value of the other power supply from the current balance terminal CB, an arithmetic amplifier 4 for superimposing an output signal of the arithmetic amplifier 5 to the reference value via a first diode D1 to compare it with the voltage detection value of the voltage detecting unit 3 and then inputting the signal to a pulse width control circuit 1, a reference voltage circuit including series regulator SRG or the like, and a second diode D2 for clamping to a partial potential of the reference voltage circuit the connecting point potential of the first and second resistors R4, R5 connected to the output terminal of the arithmetic amplifier 5.
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