发明名称 POWER SUPPLY DEVICE, ITS CONTROL METHOD, PORTABLE ELECTRONIC EQUIPMENT, AND ELECTRONIC CLOCK
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.
申请公布号 JP2000184724(A) 申请公布日期 2000.06.30
申请号 JP19980355250 申请日期 1998.12.14
申请人 SEIKO EPSON CORP 发明人 FUJISAWA TERUHIKO
分类号 G04G19/02;G04C10/00;G04G19/00;G04G99/00;H02J7/00;H02M7/12;H02M7/219 主分类号 G04G19/02
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