Patent ID: 6650558
Filing Date: 2003-11-18
Classification: H02M

Abstract:
A full-wave switching power supply, comprising:first, second, third, and fourth controllable switches, each including a control electrode and a controlled current conducting main path; means connecting a first end of said main path of said first controllable switch to a second end of said main path of said third controllable switch to thereby define a first tap point; means connecting a first end of said main path of said second controllable switch to a second end of said main path of said fourth controllable switch, to thereby define a second tap point; an output transformer including a primary winding coupled to said first and second tap points, for being driven, during operation, with alternating voltage appearing thereacross; zero-voltage switching signal generating means; transformer means coupled to said zero-voltage switching signal generating means and to said control electrodes of said first, second, third, and fourth controllable switches; first, second, third and fourth subsidiary power supplies coupled to secondary windings of said transformer means, for generating subsidiary direct voltages in response to said switching signals; and first, second, third, and fourth control electrode switches coupled to said first, second, third, and fourth subsidiary power supplies, respectively, and to said control electrodes of said first, second, third, and fourth controllable switches, respectively, for coupling said first and third subsidiary direct voltages to said control electrodes of said first and third controllable switches, respectively, during their respective turn-on intervals, and for coupling said second and fourth subsidiary direct voltages to said control electrodes of said second and fourth controllable switches, respectively, during their respective turn-off intervals.