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|1. (WO2018040789) POWER SUPPLY PROTECTION CIRCUIT, METHOD AND DEVICE|
|Title:||POWER SUPPLY PROTECTION CIRCUIT, METHOD AND DEVICE|
A power supply protection circuit comprises: an auxiliary winding for sampling voltages at two ends of a capacitor in a switching power supply; a resistance-capacitance (RC) charging circuit connected to the auxiliary winding and used to convert voltages sampled by the auxiliary winding into current signals; and a control circuit used to control, according to the current signals, switching on and off of the switching power supply.