Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1986-12-01
1988-03-01
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 48, 363 98, 363126, H02M 3335
Patent
active
047290811
ABSTRACT:
An AC/DC converter comprises a half-bridge electronic self-oscillating inverter powered from the non-filtered full-wave-rectified 120 Volt/60 Hz power line voltage, and its resulting amplitude-modulted 30 kHz output voltage is applied to a series-resonant L-C circuit. The 30 kHz voltage developing across the tank capacitor of this L-C circuit is rectified and applied as DC to an energy-storing capacitor, from which the AC/DC converter's output is supplied. Trigger pulses are provided to trigger the inverter into self-oscillation at the beginning of each pulse of DC voltage provided by the unfiltered rectified power line voltage. As soon as the magnitude of the DC voltage across the energy-storing capacitor exceeds a first level, the trigger pulses cease to be provided. As soon as the magnitude of the DC voltage on the energy-storing capacitor falls below a second level, the trigger pulses are again provided. As long as the inverter is in operation, the current pulled from the power line is essentially of constant magnitude and therefore providing for a power factor of about 90%.
REFERENCES:
patent: 4193111 (1980-03-01), Wester
patent: 4199807 (1980-04-01), Crowe et al.
patent: 4263642 (1981-04-01), Simmons et al.
patent: 4340931 (1982-07-01), Endo et al.
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