Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1982-08-09
1984-03-13
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 79, 363101, H02M 3335
Patent
active
044371462
ABSTRACT:
A boost power supply having a full-wave rectifier driving an inductor, diode, and the parallel combination of a filter capacitor and load. A shunting switch connected between the inductor and diode is periodically closed to draw current through the inductor, thereby charging the inductor. The switch is then opened so that the inductor, while discharging, generates a relatively high voltage which is applied to the load and filter capacitor through the diode. The shunting switch is opened and closed in a manner which causes the input current to follow a sinusoidal waveform in phase with the input voltage with an amplitude that maintains the output voltage of the power supply constant. Specifically, a harmonically pure sinusoidal waveform is multiplied by a voltage inversely proportional to the output voltage. An offset is then added and subtracted to this waveform to generate respective positive and negative reference waveforms which are both in phase with the input voltage but differ slightly in magnitude from each other. A signal indicative of the input current is compared to the positive and negative reference waveforms to open the shunting switch when the input current reaches the level of the positive reference waveform and to close the shunting switch when the input current falls to the level of the negative reference waveform. In order to maintain the operating frequency of the switch constant, the difference between the positive and negative reference waveforms may be varied throughout the sinusoidal cycle so that the time for the inductor to charge to the positive reference waveform and discharge to the negative reference waveform is constant.
REFERENCES:
patent: 3913000 (1975-10-01), Cardwell, Jr.
patent: 4155112 (1979-05-01), Miller et al.
patent: 4196469 (1980-04-01), Gurwicz
patent: 4264971 (1981-04-01), Courier de Mere
patent: 4322787 (1982-03-01), Kraus
patent: 4355277 (1982-10-01), Davis et al.
Silicon Zener Diode & Rectifier Handbook, Motorola, 2nd ed., 1961, p. 135.
Pacific Electro Dynamics, Inc.
Shoop William M.
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