Preprocessor auxiliary power supply

Details Preprocessor auxiliary power supply Preprocessor auxiliary power supply

H - Electricity

02

M

321/75

H02M 7/06 (2006.01) H02M 3/155 (2006.01)

Patent

CA 2007517

Abstract of the Disclosure A preprocessor circuit for a front end based power converter utilizes a choke winding, a free-wheeling diode connected across the choke winding, and a semiconductor power switch. An auxiliary power supply for generating low voltage power for semiconductor switches and the like includes a secondary winding coupled to the choke winding. The secondary winding has a predetermined turns ratio with respect to the choke winding. The voltage induced into the second winding is rectified and summed to produce an output voltage which is equal to the input voltage to the preprocessor circuit divided by the turns ratio between the choke winding and the secondary winding.

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