Dimmable parallel-resonant electric ballast

Details Dimmable parallel-resonant electric ballast Dimmable parallel-resonant electric ballast

1993-07-08

1995-06-06

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315223, 315224, 315226, 315307, 315DIG4, 315DIG5, H05B 4129, H05B 41392

Patent

active

054225469

ABSTRACT:
A pre-converter is connected with AC power line voltage and provides DC voltage across a pair of DC terminals. A current-limiting inductor, a self-oscillating parallel-resonant inverter, and a periodically activated FET switch are series-connected with one another across the DC terminals. The inverter provides a high-frequency (e.g., 20-30 kHz) substantially sinusoidal output voltage across its output terminals. Each of plural rapid-start fluorescent lamps is connected across the output terminals by way of a current-limiting capacitor. The magnitude of the resulting lamp current depends on the RMS magnitude of the output voltage. In turn, for a given load condition, this RMS magnitude depends on the average magnitude of the unidirectional current drawn by the inverter from the DC terminals; which average magnitude is determined by the ON/OFF duty-cycle of the FET switch. The FET switch is turned ON/OFF at twice the frequency of the inverter's output voltage. By adjusting the ON/OFF-ratio, the average magnitude of the unidirectional current supplied to the inverter is correspondingly adjusted, thereby resulting in a corresponding adjustment in the magnitude of the lamp current.

REFERENCES:
patent: 4734624 (1988-03-01), Nagase et al.
patent: 5235255 (1993-08-01), Blom
patent: 5262701 (1993-11-01), Derra et al.

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