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1. (WO2006123905) SYNCHRONOUS RECTIFIER TYPE SERIES RESONANT CONVERTER FOR OPERATING IN INTERMITTENCE MODE

Pub. No.:    WO/2006/123905    International Application No.:    PCT/KR2006/001862
Publication Date: Nov 23, 2006 International Filing Date: May 18, 2006
IPC: H02M 3/28
Applicants: PSTEK Co.,Ltd.
SEONG, Hwanho
Inventors: SEONG, Hwanho
Title: SYNCHRONOUS RECTIFIER TYPE SERIES RESONANT CONVERTER FOR OPERATING IN INTERMITTENCE MODE
Abstract:
Disclosed is a synchronous rectifier type SRC for operating in an intermittence mode, which includes: an input power for supplying the input DC voltage; an input-side switching unit for switching four input-side switching devices to convert the input DC voltage to AC voltage, the input-side switching unit being connected to the input power, an LC resonance circuit for storing energy in a resonance inductor and a resonance capacitor by means of LC resonance, and outputting resonance voltage, the LC resonance circuit being connected to the input-side switching unit; a transformer with a primary winding and a secondary winding for converting the resonance voltage to voltage of a predetermined level according to a turn ratio to generate secondary voltage, and transferring the secondary voltage through the secondary winding, the primary winding being connected to the LC resonance circuit; an output-side switching unit for switching four output-side switching devices to convert the secondary voltage to the output DC voltage, the output-side switching unit being connected to the secondary winding of the transformer; and a gate driving circuit for detecting a polarity of secondary current flowing in the secondary winding, generating dead time, generating driving signals for driving the output-side switching device of the output-side switching unit according to the polarity, and then controlling turn-on or turn-off of the output-side switching devices, the gate driving circuit being connected to both the secondary winding of the transformer and the output-side switching unit. According to the synchronous rectifier type SRC, a no- load characteristic can be controlled with an easy scheme and a simple construction. In addition, a simple resistor is added, and thus dead time can be generated. Consequently, it is possible to simply reduce switching loss that may occur in zero voltage switching.