| 摘要 |
PURPOSE:To vary the reference voltage of a reference voltage generator in a power supply apparatus upto an identical ratio with an identical circuit regardless of the value of a standard output voltage and realize the commonization and the integration among the power supply apparatuses having different voltages. CONSTITUTION:A reference voltage supply 1 which outputs a reference voltage Vref, a variable element voltage generator 2 which outputs the variable element voltage of a necessary step proportional to the reference voltage Vref in accordance with the reference voltage Vref and an addition and subtraction circuit 3 which adds or subtracts the variable element voltage to or from the reference voltage Vref are provided and a voltage which is obtained by adding or sutracting the variable element voltage which is proportional to the reference voltage Vref with the necessary step to or from the arbitrary reference voltage Vref is outputted. |
