OVERVOLTAGE PROTECTION CIRCUIT FOR MULTI-OUTPUT CONVERTER

PURPOSE:To reduce the number of specified component parts, by detecting the overvoltage of a plurality of outputs, and by transmitting the detected result to a primary side circuit by one photocoupler set in common. CONSTITUTION:A switching element Q is ON/OFF-driven, and a plurality of outputs are...

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Hauptverfasser:	KOYASHIKI TORU, YOSHIZAWA KINPEI, ICHIHARA SEIJI, YOSHIKAWA TAKETOSHI, OGATA TSUTOMU, SAWAHATA SATORU
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:	PURPOSE:To reduce the number of specified component parts, by detecting the overvoltage of a plurality of outputs, and by transmitting the detected result to a primary side circuit by one photocoupler set in common. CONSTITUTION:A switching element Q is ON/OFF-driven, and a plurality of outputs are obtained on the secondary side via a transformer T. Output voltage is compared respectively with the Zener voltage of the Zener diodes ZD1 and ZD3, ZD2 and ZD4. When the output voltage exceeds the Zener voltage, then current flows to the luminous diode PC of a photocoupler, and a light-receiving transistor PC' is worked in the conducting direction, and the switching element Q is made non-conductive by a switching element driving stop circuit 2.