Patent ID: 7158390
Filing Date: 2007-01-02
Classification: H02M,Y02B

Abstract:
1. A converter comprising: a first switch group including a first switch and a second switch coupled in series between an input power source and a ground power source; a second switch group including a third switch and a fourth switch coupled in series between the input power source and the ground power source; a transformer having a primary inductor coupled between a node of the first and second switches and a node of the third and fourth switches, and transmitting a power to the secondary according to a conductive path determined by the first to fourth switches; a load combined to the secondary of the transformer; a feedback circuit for outputting a signal corresponding to the power transmitted to the load; a PWM (pulse width modulation) unit for outputting pulse signals for driving the first to fourth switches based on the signal transmitted from the feedback circuit; and a switch driver for driving the first to fourth switches according to the pulse signals output by the PWM unit, wherein the PWM unit is operable to output pulse signals for controlling turning on/off operation of the first to fourth switches so that the first switch group and the second switch group may alternately perform zero voltage switching and to switch at the same current.