Patent ID: 6097614
Filing Date: 2000-08-01
Classification: H02M,Y02B

Abstract:
An asymmetrical pulse width modulated converter, comprising:a chopper circuit operative to convert a DC input signal to an AC signal of a high frequency, said chopper circuit including two switches, each having a snubber capacitor coupled there-across, said switches being alternately made conducting by respective gate pulse signals applied thereto, said gate pulse signals having complementary duty cycles;a compensation network, coupled to said chopper circuit, operative to provide zero voltage switching of said two switches, said compensation network including a first auxiliary capacitor coupled in series with a second auxiliary capacitor, the series connected auxiliary capacitors coupled between the input signal and said two switches, and an inductive element coupled to a center point between the series connected auxiliary capacitors and a center point between said two switches;a resonant circuit, coupled to said chopper circuit, said resonant circuit sending said high frequency AC signal to a transformer, said transformer providing a secondary AC signal; anda rectifier circuit, coupled to said transformer, said rectifier circuit operative to generate a stable DC output signal in response to said secondary AC signal.