Method of operating a resonant push-pull converter in an above resonant frequency mode

Abstract

A method is disclosed for operating a push-pull converter in an above resonant frequency operating mode, where the above resonant frequency operating mode produces a switching frequency that is higher than the natural operating resonant frequency of the converter circuit. This in turn means that the resonant period is longer than the turn-on period of each of the switches in the primary circuit. A method for operating a push-pull converter in an above resonant frequency mode, the push-pull converter having a first power switch and a second power switch operating in alternating sequence with each, the push pull converter having a transformer with a primary winding coupled to the first and second power switches and with a secondary winding coupled to a secondary circuit and an output capacitor, comprises generating an operating resonant frequency from a leakage inductance of said transformer in series with a capacitance; and generating a switching frequency for the power switches that is higher than the operating resonant frequency.

Dependencies are inferred from the claim text.