Power supply and method of operating the same

Abstract

A power supply includes an AC-DC converter, a feedback circuit, an undervoltage protection circuit, a control signal generation circuit, a voltage anomaly protection circuit, and an auxiliary undervoltage detection circuit. The AC-DC converter converts AC voltage to DC voltage. The feedback circuit generates a feedback signal corresponding to the DC voltage. The control signal generation circuit configures the AC-DC converter to convert the AC voltage to DC voltage. When the auxiliary undervoltage detection circuit detects that the AC voltage has been below a predetermined voltage for a period exceeding a preset time, the auxiliary undervoltage detection circuit changes the signal value of the first feedback signal, thereby triggering the control signal generation circuit to configure the AC-DC converter to execute a soft-start procedure via the voltage anomaly protection circuit.

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