Patent ID: 8072786

Claim:
A power supply module configured for converting an alternating current (AC) voltage to a first direct current (DC) voltage and applying the first DC voltage to a load, the power supply module comprising: a rectifying and filtering unit configured for rectifying the AC voltage into a primary DC voltage and filtering the primary DC voltage; a power factor correction (PFC) unit configured for correcting a power factor of the filtered primary DC voltage; a voltage transforming unit configured for converting the corrected primary DC voltage and generating the first DC voltage; an input port configured for receiving a first instruction or a second instruction and generating a first signal or a second signal correspondingly; and a switch unit coupled between the voltage transforming unit and the load, the switch unit configured for establishing an electrical connection between the voltage transforming unit and the load for applying the first DC voltage to the load according to the first signal, or configured for disabling the electrical connection between the voltage transforming unit and the load to stop applying the first DC voltage to the load according to the second signal, wherein the switch unit comprises: a first transistor comprising a base, a collector, and an emitter, the base electrically connected to the input port, and the emitter electrically grounded; a metal oxide semiconductor (MOS) transistor comprising a gate, a drain, and a source, the gate electrically connected to the collector of the first transistor, the drain electrically connected to the load, and the source selectively receiving the first DC voltage; and a first resistor, electrically connected between the source and the gate of the MOS transistor.