Jackie T Tang

age ~72

from Riverside, CA

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Power Factor Correction Circuit For Dc-Dc Converters With Low Resonance Current
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US Patent:

20060267561, Nov 30, 2006
Filed:

May 27, 2005
Appl. No.:

11/139162
Inventors:

Moshe Domb - Irvine CA, US
Jackie Tang - Irvine CA, US
International Classification:

G05F 1/00
US Classification:

323222000
Abstract:

An improvement in a power factor correction circuit with ZVS provides low resonance current. The basic circuit includes a positive input and ground terminal and an output capacitor connected between a positive output terminal and ground. A power factor indicator (Lin) and an output diode (D) are connected between the positive input and output terminals. A main transistor switch (Q) periodically connects a node between Lin and Dto ground to store energy in Lin which is transferred to the output when Qis turned off. A resonant indicator (Lr) and an auxiliary transistor switch, connected across Q, discharges Q's source drain capacitance prior to turning Qon to provide ZVS. The improvement comprises an additional inductor (L) connected in series between Lin and Dto isolate D's reverse recovery current from the resonant current in Lr.

Lossless Clamp Circuit For Dc-Dc Converters
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US Patent:

7342811, Mar 11, 2008
Filed:

May 27, 2005
Appl. No.:

11/140315
Inventors:

Moshe Domb - Irvine CA, US
Amritlal H. Patel - Anaheim CA, US
Jackie Tang - Irvine CA, US
Assignee:

Cherokee International Corporation - Tustin CA
International Classification:

H02M 3/335
H02H 7/122
US Classification:

363 2106, 363 5601
Abstract:

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.