Power-factor-corrected electronic ballast

Details Power-factor-corrected electronic ballast Power-factor-corrected electronic ballast

1991-07-29

1993-01-19

Dzierzynski, Paul M.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Supply circuit current and/or potential actuated switch

315209R, 315247, 315244, 315170, 315194, 315DIG5, 315DIG7, 363 37, 363 46, 363 89, 363125, 323319, 323235, H05B 3700

Patent

active

051809508

ABSTRACT:
In a power-factor-corrected electronic ballast, an AC/DC converter comprises a half-bridge electronic self-oscillating inverter powered from non-filtered full-wave-rectified 120 Volt/60 HZ power line voltage, and its resulting amplitude-modulated 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 direct current to an energy-storing capacitor, from which a DC supply voltage is provided to a frequency-converting ballast which, in turn, provides a substantially non-modulated high-frequency AC output voltage used for powering a gas discharge lamp via a current-limiting inductor. 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: 3389299 (1968-06-01), Bell
patent: 3448335 (1969-06-01), Gregory et al.
patent: 3912969 (1975-10-01), Nakai et al.
patent: 4729081 (1988-03-01), Nilssen
patent: 4745539 (1988-05-01), Nilssen

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