FLYBACK SWITCHING POWER SUPPLY, SELF-POWERED CIRCUIT AND METHOD THEREOF

Abstract: disclosed are a flyback switching power supply and a self-powered circuit and method therefor. the self-powered circuit includes: a charging capacitor configured to draw power from a primary coil and supply power to a switching power supply chip; a withstand voltage switch tube for acquiring a power supply voltage of the primary coil and outputting a charging voltage; a charging switch tube for controlling whether to charge the charging capacitor; an adjustment control tube for limiting the charging voltage of the charging capacitor; a voltage limiting control unit for controlling the conduction state of the adjustment control tube according to the charging voltage; a charging control unit preset with a charging requirement; and an inverter for acquiring the conduction switch signal and controlling the voltage limiting control unit or the charging control unit to be connected to the adjustment control tube according to the conduction switch signal.

Inventor(s): Xinchun LIN, Lingbo ZHENG, Fulong WANG, Jie ZHANG

CPC Classification: H02M3/3353 (APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers ; dynamo-electric converters ; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters ))

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