Pulse width modulated dc to dc power supply

H - Electricity – 02 – M

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321/29

H02M 3/335 (2006.01) H02P 13/24 (1980.01)

Patent

CA 1114448

ABSTRACT: A switched-mode supply circuit whose out- put direct voltage is substantially independent of varia- tions in the input direct voltage by means of a pulse duration modulation of a controlled switch connected in series with the primary winding of a transformer. A first rectifier connected to a first secondary winding of the transformer conducts during the out off period of the switch whereas a second rectifier connected to a second secondary winding of the transformer conducts during the conduction period of the switch. A load is coupled to both rectifiers so that the output voltage across the load is the sum of the first and second direct voltages derived from the first and second rectifiers, respectively, the second voltage being greater than the first voltage. This permits a substantial reduction in size of the transformer and a tighter coupling between the windings thereof.

298312

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