Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1982-09-09
1984-11-06
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 80, H02M 3335
Patent
active
044815646
ABSTRACT:
A switched-mode power supply providing high speed switch operation and high efficiency is disclosed. Faster switch turn-off is accomplished by means of an additional primary winding in the power supply's converter transformer which causes switching current to be diverted from the switch element when the oscillating switch transitions to the cut-off state. More rapid switch turn-on is achieved by shunting current from the regulation circuit of the power supply during initial switch turn-on in providing the entire switch control output of a blocking oscillator to the switch element. Power supply regulation is provided by an optical link including a photodiode coupled to a secondary of the converter transformer and a phototransistor which controls the input provided to the switch by the blocking oscillator. More rapid switch operation improves the inductive transfer of energy in the switched-mode power supply thus increasing power supply efficiency and prolongs the operating lifetime of the power supply's switch element.
REFERENCES:
patent: 3873846 (1975-03-01), Morio et al.
patent: 3889173 (1975-06-01), Klusmann et al.
patent: 4063307 (1977-12-01), Stephens
patent: 4092709 (1978-05-01), Voigt et al.
patent: 4130862 (1978-12-01), Holt
patent: 4208705 (1980-06-01), Hosoya
patent: 4228493 (1980-10-01), de Sartre et al.
patent: 4253137 (1981-02-01), Rao
patent: 4276586 (1981-06-01), Boekhorst
patent: 4327404 (1982-04-01), Horiguchi
Boschert, Flyback Converters, Electronics, Dec. 21, 1978; pp. 100-104.
Shoop William M.
Starrett Jeffrey
Zenith Electronics Corporation
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