Patent ID: 6483724
Filing Date: 2002-11-19
Classification: H02M,Y02B

Abstract:
An LSL (Low Switching Loss) full bridge DC/DC converter, comprising:first and second power input means for supplying a low ripple voltage to be converted to an isolated stable voltage; first, second, third, and fourth switching devices interconnected to form a full bridge circuit between said first and second power input means, wherein each of said first, second, third, and fourth switching devices include a control input, switched power input and output terminals, a predetermined minimum capacitance and current blocking diode effect paralleled between said switched power input and output terminals and further wherein said first and third switching devices are connected to said first power input means and said second and fourth switching devices are connected to said second power input means; a first bridge power output terminal interconnected to said first and second switching devices; a second bridge power output terminal interconnected to said third and fourth switching devices; first switching input means for providing an alternating voltage constant pulse width signal to said control input of said first and third switching devices; second switching input means for providing an alternating voltage pulse width modulated control signal to said control input of said second and fourth switching devices; an output transformer having primary and secondary windings; a primary clamp circuit including at least one diode and an inductance; means connecting said primary clamp circuit and the primary winding of said output transformer in series between said first and second bridge power output terminals; and output rectification circuitry, including at least a rectifier and an inductance, connected to said secondary winding of said output transformer.