Patent ID: 8242628
Filing Date: 2012-08-14
Classification: H02M,Y02B,Y02P

Abstract:
1. A power device, comprising: an input unit comprising a first rectifying circuit to rectify input power; a power factor unit comprising an input end to receive the rectified power from the first rectifying circuit, an output end, a power factor correction circuit, and a first detection circuit connected to both the output end and the power factor correction circuit; a first electronic switch connected to the first detection circuit in series; an output unit comprising an output transformer having a primary winding and at least one secondary winding, a power switch, a pulse width modulation (PWM) circuit and at least one second rectifying circuit, wherein the primary winding receives output power from the power factor unit, wherein the at least one secondary winding is connected to the at least one second rectifying circuit, and the power switch is connected to the primary winding and is under control of the PWM circuit; and a control signal port to control an on/off state of the first electronic switch; wherein when the power device is in a standby state, the control signal port controls the first electronic switch off to deny power to the first detection circuit.