Patent ID: 6449180
Filing Date: 2002-09-10
Classification: H02M

Abstract:
A world wide power supply apparatus, comprising:a full-wave rectifier circuit having a pair of AC input terminals and a pair of DC output terminals; a pair of capacitors connected in series between said pair of DC output terminals; a relay switch connected between a common connection point of said capacitors and one of said pair of AC input terminals; and a relay driving circuit driving said relay switch so that said relay switch operates in a voltage doubling mode by turning on said relay switch when an AC voltage supplied to said pair of AC input terminals is a low voltage, and operates in a full-wave rectification mode by turning off said relay when said AC voltage supplied to said pair of AC input terminals is a high voltage, wherein said relay driving circuit comprises: a voltage convention part converting said AC voltage supplied to said pair of AC input terminals to a DC voltage, an operation delay part maintaining said relay switch in a turn-off state for a constant time in an initial operation, and a driving part driving said relay switch in response to said voltage conversion part after said constant time is passed.