Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1986-08-28
1987-06-09
Beha, Jr., William H.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323222, 323224, 323288, G05F 1575
Patent
active
046723030
ABSTRACT:
A DC to DC power converter having reduced switching loss for operation at high frequencies. As disclosed, a buck, or forward, converter includes a first FET as the switching device in series with an inductor and a second FET as the flywheel device. At the common node to which the two FET's and the inductor are connected, there is sufficient capacitance that the FET's may be turned off without appreciable voltage change across the FET's. The value of the inductor is chosen, with respect to the input and output voltages and frequencies of operation involved, to insure that the inductor current polarity reverses each cycle, raising the node voltage to the level of the input voltage, substantially eliminating turn-on losses of the first FET. Control circuitry is provided for regulation of the power converter to control the peak-to-peak current in the inductor and to insure that at least a selected minimum value of the inductor current is present for each cycle of operation of the converter. An over-voltage protection circuit for the output of the converter is also provided.
REFERENCES:
patent: 4392103 (1983-07-01), O'Sullivan et al.
patent: 4459539 (1984-07-01), Cordy
patent: 4553082 (1985-11-01), Nesler
patent: 4555655 (1985-11-01), Tanaka
Beha Jr. William H.
International Business Machines - Corporation
McArdle, Jr. John J.
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