Peak voltage clamped power supply

Details Peak voltage clamped power supply Peak voltage clamped power supply

1981-12-09

1984-03-13

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363126, 363 53, 323274, H02P 1326

Patent

active

044371489

ABSTRACT:
The cost and energy efficiency of a power supply are optimized in a semi-regulated circuit wherein regulation occurs only under a high voltage, low current condition when peak output voltage would otherwise exceed a maximum specified voltage. The circuit includes a full wave rectifier (21-24) driving a modified pi filter (33-35). A transistor (62) in series with the filter is biased by a resistor (65) to normally operate in a fully saturated, low power dissipating mode. When the output (31-32) voltage approaches the specified maximum, the breakdown voltage of a zener diode (71) is exceeded, and the output voltage is clamped to the specified maximum through the zener diode and the base-emitter junction of the transistor.

REFERENCES:
patent: 2862170 (1958-11-01), Hjermstad
patent: 3456155 (1969-07-01), Buchanan
patent: 3470451 (1969-09-01), Arase
patent: 4075685 (1978-02-01), Fisler
patent: 4183082 (1980-01-01), Ishii
"The Radio Amateur's Handbook", 1976, pp. 120-123.
Pressman, "Switching and Linear Power Supply, Power Converter Design", Hayden Book Co., Inc., 1977, pp. 24-32.
"Electronics Magazine", Jun. 16, 1981, pp. 106-138.

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