CHARGE PUMP CIRCUIT

PROBLEM TO BE SOLVED: To provide a charge pump circuit reducing the area of a used capacitor, compared with a conventional technique. SOLUTION: When an input terminal 101 has a voltage 0, the output voltage of an pulse voltage step-up circuit 102 becomes 0, and a capacitor 106 is charged with a powe...

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Hauptverfasser:	MATOBA SHINJI, CHIN GIYOUSHIYOU, ASANO MASAMICHI, OKAMURA SHUJI, TOKUNAGA TOMOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a charge pump circuit reducing the area of a used capacitor, compared with a conventional technique. SOLUTION: When an input terminal 101 has a voltage 0, the output voltage of an pulse voltage step-up circuit 102 becomes 0, and a capacitor 106 is charged with a power supply voltage Vcc via an FET 110. Here, the forward drop voltage of the FET is not considered. Then, when the input terminal 101 has a voltage Vcc, the output voltage of the pulse step-up circuit 102 is a voltage 2Vcc, and the voltage of a point C1 is 3Vcc. At this time, the voltage of an inverter 103 is 0, and the output voltage of the pulse voltage step-up circuit 104 is 0. As a result, a capacitor 107 is charged with a voltage 3Vcc. Then, when the voltage of the input terminal 101 is 0, the output of the inverter 103 is a voltage Vcc, the output voltage of the pulse voltage step-up circuit 104 is 2Vcc, and the voltage of the point C2 is 5Vcc. The voltage of a point C2 is outputted through the FET 112. COPYRIGHT: (C)2009,JPO&INPIT