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Flyback Converter System Disclosure Number: IPCOM000051353D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10

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Rizzo, RP [+details]


In this power supply flyback converter system, unregulated input power Vin DC is obtained from AC source Vin AC, e.g., 115 volts - 60 Hz - single phase. Vin AC is rectified and filtered by full-wave bridge rectifier CR1-CR4 and capacitor filter network R1,C1. Vin DC is applied across the series-connected circuit elements of primary winding 1 of flyback transformer T1, collector-emitter circuit of NPN switching transistor Q4, and emitter resistor R32. Clamping circuit C10, R30, CR11 clamps the collector of transistor Q4 when Q4 is turning off.