Patent ID: 7843708
Filing Date: 2010-11-30
Classification: H02M,Y02B,Y02P

Abstract:
1. A synchronous rectifier type Series Resonant Converter (SRC) for converting input DC voltage to output DC voltage having a level different from that of the input DC voltage, the synchronous rectifier type SRC comprising: 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 based on the polarity and the generated dead time, and then controlling turn-on or turn-off of the output-side switching devices based on the generated driving signals, the gate driving circuit being connected to both the secondary winding of the transformer and the output-side switching unit.