Power supply with reduced switching losses

Details Power supply with reduced switching losses Power supply with reduced switching losses

1987-12-10

1989-11-28

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 17, H02M 75387

Patent

active

048841862

ABSTRACT:
A switching power supply includes an output transformer including a primary winding and a secondary winding. The primary winding is coupled to a switching transistor. Of importance, a diode is coupled across the switching transistor. During the time period before the switching transistor turns on, the output transformer draws magnetizing current through the diode, and thus before the transistor turns on, the voltage across the transistor is limited to one diode voltage drop. Thus, the switching losses incurred when the transistor turns on are minimized. In one embodiment, the power supply is a full bridge converter including first and second transistors coupled to one lead of the primary winding, and third and fourth transistors coupled to a second lead of the primary winding. The output voltage of the converter is regulated by modulating the switching phase of the first and second transistors relative to the third and fourth transistors.

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Patterson et al., "Pseudo-Resonant Full Bridge DC/DC Converter", Power Electronics Specialist Conference (PESC) sponsored by IEEE, Virginia Polytechnic Institute & State Univ., Jun. 21-26, 1987, pp. 424-430.
"Semiconductor Power Circuits Handbook", published by Motorola, Inc. in 1968, pp. 2-1 to 2-29.
Patterson Thesis, "Pseudo-Resonant Full Bridge DC/DC Converter," Univ. of Wisconsin, Madison, Apr., 1987, pp. 1-108.

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