Switching power supply

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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363 75, H02M 3335

Patent

active

045959730

ABSTRACT:
A switching power supply has a saturable transformer provided with first to fourth windings. The first winding is inserted in series in a first path from a DC power source to a primary winding of a power transmitting transformer. A main switch is inserted in series in the first path and controlled by an output of the second winding. The operation of the main switch is positively fed back through the saturable transformer. A capacitor is connected in parallel to a series circuit consisting of the main switch and the first winding. An auxiliary source for generating a predetermined direct current output is provided to drive the third winding by a polarity opposite to that of the first winding. An auxiliary switch is inserted in series in a second path from the auxiliary source to the third winding and controlled by an output of the fourth winding. The operation of the auxiliary switch is positively fed back through the saturable transformer.

REFERENCES:
patent: 3697851 (1972-10-01), Mast
patent: 4318164 (1982-03-01), Onodera et al.
Kohno et al., "A Saturable Reactor Controlled Ringing Choke Converter", INTELEC 1979, Wash., D.C., USA, (Nov. 26-29 1979), pp. 265-271.
PESC '82 Record (IEEE 82CH-1762-4) pp. 27-32 "On the High-Speed Switching of the Free-Run DC-to-DC Converter With a Saturating Core"; K. Harada et al., Jun. 14-17, 1982.

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