| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply capable of feeding stable voltage with low power consumption. SOLUTION: This power supply consists of an N buffer 22, a P buffer 23, a comparator 24, a variable resistance control circuit 25, voltage-dividing resistors R1 to R4, variable resistors r1 to r3 and a resistor Rr. The resistors R1 to R4 divide transformed voltages Vsup to divided voltages Vd1 to Vd3 and feed the divided voltages Vd1 to Vd3 to the buffer 22. The variable resistors r1 to r3 generate the voltages Vd1 to Vd3 and voltages Vd1' to Vd3' respectively having potential difference and feed the voltages Vd1 to Vd3 and the voltages Vd1' to Vd3' to the buffer 23. The buffers 22 and 23 alternately operate and output operating voltages V1 to V3 to an external device. The comparator 24 compares the voltage of the resistor Rr, generated by current caused to flow through the buffers 22 and 23 with a reference voltage Vref. The control circuit 25 sets resistance values of the resistors r1 to r3 according to the comparison results of the comparator 24.
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