Patent ID: 9112424
Filing Date: 2015-08-18
Classification: H02M

Abstract:
1. A power supply device, comprising: a power supply unit supplying preset DC power by switching input power using a full bridge by a phase shift method; and a control unit controlling a switching time of a switch of the full bridge according to a load state in which the DC power is received from the power supply unit; wherein the switch of the full bridge of the power supply unit includes: wherein the control unit maintains a switching on time of at least one of the first and second lagging leg switches as before, in the case that the load current is above a predetermined load current; and wherein the control unit delays a switching on time of at least one of the first and second lagging leg switches, in the case that the load current is below the predetermined load current; wherein the switching on time is a point in time of switching on the first or second lagging leg.