General Electric Company

Cherokee International Corporation

Moshe Domb

Amritlal H Patel

Jackie Tang

The disclosure provides a power factor correcting (PFC) circuit, a power supply and a method of manufacturing a power converter. In one embodiment, the PFC circuit has a positive input terminal, an output terminal and a ground terminal and includes: (1) a power factor inductor coupled in series between the positive input terminal and the output terminal, (2) a main switch configured to periodically connect the power factor inductor to the ground terminal and (3) a clamping capacitor coupled to the power factor inductor and configured to provide zero turn-off loss for the main switch.

Power factor correction efficiency improvement circuit, a converter employing the circuit and a method of manufacturing a converter

A lossless clamping circuit for use in a synchronous rectifier DC-DC converter in which at least one transistor switch (MOSFET) periodically connects two terminals of an output transformer winding across a main output and return terminal to provide a DC current at a selected voltage for a load connected between the output and reference terminals. A diode and an auxiliary capacitor are connected in series across the MOSFET's drain source so that the capacitor accumulates a charge in accordance with the reverse recovery current in the winding leakage inductance when the MOSFET is turned off and an auxiliary DC-DC converter is connected to the auxiliary capacitor for converting the accumulated charge across the capacitor to a DC current at a selected output voltage. Preferably the output of the auxiliary DC-DC converter is connected to the main output terminal to supplement the output power.

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Irvine, CA, United States of America

Moshe Domb