Patent ID: 7196916
Filing Date: 2007-03-27
Classification: H02M

Abstract:
1. A half-bridge DC-to-DC converter having alternated duty cycle control comprising: a primary side circuit having a half-bridge rectifier having a transformer with a primary and a secondary side, a serial first and a second half-bridge switch in parallel with a serial first and second half-bridge capacitor across an input voltage source, a common end of the first and second half-bridge capacitor connected to one end of the transformer primary and a common end of the first and second half-bridge switch connected to the opposite end of the transformer primary; a secondary side circuit having a first and second inductor serially connected across the transformer secondary and a first and a second secondary side switch connected in series with the first and second inductor, respectively, wherein the input power is delivered to the output alternatingly through the first and second inductor and corresponding one of the first and second secondary side switches; and an alternated duty cycle controller for producing alternating first and second control signals for controlling the first and second half-bridge switches on the primary side for alternating zero-voltage switching of the first and second half-bridge switches during alternating switching cycles, keeping equal power losses distribution between the first and second half-bridge switches.