Patent ID: 7738270

Claim:
A power supply device with power conversion capabilities, comprising: an input module for receiving an alternating current power; a power converting module coupled to the input module for converting the alternating current power to a direct current power, wherein the alternating current power is received from a first output node and a second output node of the input module; and an output module coupled to the power converting module for outputting the direct current power, wherein the power converting module further comprises: an alternating current impedance circuit composed of a variable resistor and a capacitor, wherein the capacitor has a first node coupled to the second output node of the input module for choking the alternating current power; a rectifying circuit coupled to the alternating current impedance circuit having two alternating current input nodes and two direct current output nodes for converting the alternating current power to a direct current power, wherein a first alternating current input node is coupled to the first output node of the input module, a second alternating current input node is coupled to a second node of the capacitor and the variable resistor is coupled in parallel to the two alternating current input nodes of the rectifying circuit; and a direct current impedance circuit coupled to the two direct current input nodes of the rectifying circuit for outputting the direct current power.