OVERVOLTAGE PROTECTION CIRCUIT AND ELECTRONIC APPARATUS USING THE SAME

PROBLEM TO BE SOLVED: To provide an overvoltage protection circuit utilizing an N-channel MOSFET as a switch transistor. SOLUTION: The switch transistor M1 as an N-channel MOSFET is provided between an input terminal 102 and an output terminal 104. A clamping circuit 40 clamps an input voltage Vdc t...

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1. Verfasser:	TAMEGAI YOICHI
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 CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an overvoltage protection circuit utilizing an N-channel MOSFET as a switch transistor. SOLUTION: The switch transistor M1 as an N-channel MOSFET is provided between an input terminal 102 and an output terminal 104. A clamping circuit 40 clamps an input voltage Vdc to a predetermined clamp voltage Vcl or lower. A charge pump circuit 10 steps up an output voltage Vdc2 of the clamping circuit 40, and outputs the stepped-up voltage to a gate of the switch transistor M1. An overvoltage monitoring section 20 compares the input voltage Vdc with a predetermined overvoltage threshold value Vovp, and instructs the charge pump circuit 10 to perform a voltage step-up operation if the input voltage Vdc is lower than the overvoltage threshold voltage Vovp. COPYRIGHT: (C)2009,JPO&INPIT