Patent ID: 7227763
Filing Date: 2007-06-05
Classification: H05B

Abstract:
1. A power supply apparatus using a half-bridge circuit for rectifying an alternative current (AC) power source and providing the rectified power source to a load, comprising: a line voltage detecting means for detecting a voltage of an input power source provided to the load; an error amplifying means for comparing the voltage detected from the line voltage detecting means with a reference voltage and outputting a voltage corresponding to a difference therebetween; a pulse width modulating means for outputting a pulse having a variable width corresponding to an output level of the error amplifying means; a dead time controlling means for outputting a first pulse corresponding to a high side and a second pulse corresponding to a low side by the pulse output from the pulse width modulating means, wherein the first and second pulses have different pulse widths and different rising and falling time points; and a driving means for driving the power source supplied to the load as a constant current state by the first and second pulses.