Patent ID: 6434029
Filing Date: 2002-08-13
Classification: H02M,Y02B

Abstract:
A power converter having two input terminals for connection to a power source, comprising:an inductor connected to a first one of said input terminals; a boost diode connected in series communication with said inductor, said boost diode having a cathode connected to a first output terminal; an output capacitor coupled across said first output terminal and a second output terminal; a control switch, connected between a first node at the junction of said series connected inductor and boost diode and a second of said input terminals, for controlling the application of voltage to said output terminals as a function of the duty cycle of said control switch, the second of said input terminals and said second output terminal being connected in common; a resonant network, coupled between said first node and said first output terminal, said resonant network including a snubber inductive element, a first resonant diode, a second resonant diode, a third resonant diode, and a fourth resonant diode, said snubber inductive element having a primary winding and secondary winding, said primary winding and said first resonant diode connected in series between said first node and a second node, the cathode of said first resonant diode coupled to said second node and the anode of said first resonant diode coupled to said primary winding, said second and third resonant diodes connected in series between said second node and said first output terminal, said secondary winding and said fourth resonant diode connected in series between said second input terminal and said second node, the anode of said fourth resonant diode coupled to said secondary winding and the cathode of said fourth resonant diode coupled to said second node; a first resonant capacitor coupled between said first node and the junction of said second and third resonant diodes; and an auxiliary switch, connected between said second node and said second output terminal, said auxiliary switch being turned on such that the voltage at said control switch is caused to reduce to zero when said control switch turns on.