| 摘要 |
PROBLEM TO BE SOLVED: To provide an AC/DC separating circuit which can separate an AC voltage from a DC voltage without using a large-scale inductor, and further has a high input impedance with the small number of parts. SOLUTION: The AC/DC separating circuit 4 separates an input voltage in which an AC voltage Vac is superimposed on a DC voltage Vdc into a DC voltage and an AC voltage. The AC voltage Vac is inputted into a non-inverting amplifier A having a high input impedance through a first capacitor C1, and an AC voltage Vac1 is extracted. The output of the amplifier A is applied to a connection point between first and third inductors L1, L3 through a second capacitor C2 and a second inductor L2 to make the inductance of the first inductor L1 equivalently infinite. A DC voltage Vdc2 obtained by attenuating and removing an AC voltage Vac2 with a low-pass filter consisting of a third capacitor C3 and a third inductor L3 is supplied to a DC load Zdc. COPYRIGHT: (C)2004,JPO
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