Patent ID: 8242712
Filing Date: 2012-08-14
Classification: H05B

Abstract:
1. A power supply apparatus, comprising: an alternating current (AC) to direct current (DC) converter; an open loop power switcher connected to the AC to DC converter, for providing an alternating current (AC) input voltage according to a DC power outputted by the AC to DC converter; a power isolation transformer, coupled to the open loop power switcher, having a primary-side winding, a first winding, and a second winding, wherein the first and second windings are disposed at a secondary-side of the power isolation transformer and the first winding is employed for generating a first voltage signal according to the AC input voltage; a backlight driving circuit, coupled to the first winding of the power isolation transformer, for driving a backlight module according to the first voltage signal; and a power circuit, coupled to the second winding of the power isolation transformer, for receiving a second voltage signal generated from the second winding according to the AC input voltage in order to generate an output power signal; wherein the open loop power switcher is disconnected from the backlight module receiving no feedback from the backlight module.