Patent ID: 7184279

Claim:
A switching circuit comprising: a dc power source; a switching device having a first and a second switching device terminals; a transformer having a first and a second primary winding terminals, and a first and a second secondary winding terminals, the second primary winding terminal connected to the second switching device terminal; a freewheeling diode have a first and a second freewheeling diode terminals, the second freewheeling diode terminal connected to the first primary winding terminal, the series combination of the switching device, the primary winding of the transformer and the freewheeling diode connected across the output of the dc power source; a load impedance; a choke connected in series with the load impedance, the series combination of the load impedance and the choke connected across the series combination of the freewheeling diode and the primary winding of the transformer; a first diode; a transferred energy storage capacitor, the transferred energy storage having a common connection with the anode of the first diode, the series combination of the first diode and transferred energy storage capacitor connected in parallel with the series combination of the load impedance and choke; a second diode; a transformer energy storage capacitor; the transfer energy storage capacitor having a common connection with the cathode of the second diode, the series combination of the winding transfer energy storage capacitor and second diode connected across the first and the second secondary winding terminals, the anode of the second diode connected to the second secondary winding terminal; a third diode; and a resonance inductor, the resonance inductor connected to the anode of the third diode, the series combination of the resonance inductor and the third diode connected between the common connection of the series combination of the first diode and transferred energy storage capacitor and the common connection of the series combination of the second diode and transformer energy storage capacitor.