Patent ID: 6424543
Filing Date: 2002-07-23
Classification: H02M

Abstract:
An integral DC to DC converter for converting at least one input DC voltage into an output DC voltage, comprising:an input capacitor for providing an input DC voltage; a DC to AC circuit connected with said input capacitor for converting said input DC voltage to a high frequency first AC voltage wherein said DC to AC circuit comprises a full-bridge switching device having two switching devices located in a first bridge arm and two switching devices located in a second bridge arm; a transformer having primary and secondary windings for converting said first AC voltage into a second AC voltage wherein the primary winding of said transformer is connected to said DC to AC circuit; a rectifying circuit connected to the secondary winding of said transformer for rectifying said second AC voltage to said output DC voltage wherein said rectifying circuit comprises rectifier diodes; a filtering capacitor connected to said rectifying circuit for filtering said output DC voltage; and a control signal generator for providing a first control signal and a second control signal in response to said input DC voltage to control said full-bridge switching device in two alternative operation states, wherein said first control signal allows the two switching devices in said first bridge arm and the two switching devices in said second bridge arm to alternately conduct and shut, and said second control signal allows the two switching devices in said first bridge arm to alternately conduct and shut and allows the upper switching device in said second bridge arm to keep shutting and the lower switching device in said second bridge arm to keep conducting.