摘要 |
PROBLEM TO BE SOLVED: To efficiently rectify generated AC electromotive force and at the same time minimize a leakage current. SOLUTION: A diode D1 that is connected to one terminal AG1 where an AC voltage is supplied and a high-level side voltage Vdd, a diode D2 that is connected to the other terminal AG2 where an AC voltage is supplied and the high-level side voltage Vdd, a transistor 121 that is connected between the terminal AG1 and a low-level side voltage Vss', a transistor 122 that is connected between the terminal AG2 and a low-level side voltage Vss, and level shifters 123 and 124, where the level shifters 123 and 124 convert the voltage Vss to the voltage Vss'. Therefore, regardless of |Vss'|>|Vss|, the transistors 121 and 122 can be reliably turned off. |