Patent ID: 8184455
Filing Date: 2012-05-22
Classification: H02M,Y02B

Abstract:
1. A power adapter to receive at least one input power and transform to DC primary output power, comprising: a power factor correction circuit connecting to an AC input end to receive an AC input power and modulating the power factor of the AC input power to deliver a modulated power; an isolation voltage step-down circuit connecting to the power factor correction circuit to receive the modulated power and modulating the modulated power to a lower voltage to deliver a modulated lower voltage power; a switch voltage regulation circuit connecting to the isolation voltage step-down circuit to receive the modulated lower voltage power and having a determined output level to transform the modulated lower voltage power to output a determined power; a voltage stabilization circuit connecting to the switch voltage regulation circuit to modulate the determined power to become the primary output power sent to a primary output end and receive potential alterations of the primary output end and modulate the potential of the primary output power; and a power adaptation circuit, coupled between the power factor correction circuit and the voltage stabilization circuit; wherein when the power adapter is under a first operation mode, the power factor correction circuit, the isolation voltage step-down circuit, the switch voltage regulation circuit and the voltage stabilization circuit are operative to generate the primary output power; and when the power adapter is under a second operation mode, the isolation voltage step-down circuit and the switch voltage regulation circuit stop operations, and the power factor correction circuit transmits the modulated power to the voltage stabilization circuit through the power adaptation circuit to maintain an output of the power adapter.