Patent ID: 8705252
Filing Date: 2014-04-22
Classification: H02M,Y02B

Abstract:
1. An off line resonant converter, comprising: a boost storage inductance circuit to be coupled to receive an ac input line voltage; a switcher circuit coupled to the boost storage inductance circuit, the switcher circuit including stacked first and second passive switching devices coupled to the boost storage inductance circuit, the switcher circuit further including stacked first and second active bidirectional switching devices coupled to the stacked first and second passive switching devices, wherein the stacked first and second active bidirectional switching devices are controlled to generate a square wave signal and to alternately store energy in and receive energy from the boost storage inductance circuit such that a pulsating current is conducted between the boost storage inductance circuit and the switcher circuit, wherein the pulsating current is bidirectional and flows in a first direction when the ac input line voltage is at a first polarity and wherein the pulsating current flows in an opposite second direction when the ac input line voltage is at a second polarity, wherein the pulsating current conducted through the boost storage inductance circuit starts from zero each switching cycle; and a resonant circuit coupled to an output of the switcher circuit to receive the square wave signal from the switcher circuit to generate an output of the resonant converter.