Booster driven inverter ballast employing the output from the in

Details Booster driven inverter ballast employing the output from the in Booster driven inverter ballast employing the output from the in

1994-02-25

1995-10-24

Lee, Benny

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315247, 315DIG5, 315DIG7, 315224, 315307, H05B 3702

Patent

active

054612870

ABSTRACT:
An electronic ballast includes a triggered boost circuit, a driven inverter, and a low voltage signal generator in a a half-bridge, push-pull, series resonant, parallel loaded configuration. The boost circuit is triggered by a voltage from the inverter and the inverter is controlled by the low voltage signal generator. The boost circuit includes a low voltage output for powering the signal generator. In the event of a fault, the operation of the signal generator is interrupted, thereby shutting off the boost circuit and the inverter. A DC blocking capacitor is in series with the lamps and a resistor is connected in parallel with the DC blocking capacitor. The ballast is started by a pulse of displacement current through the lamp filaments to the boost circuit. Since the lamp filaments must be intact, the ballast does not begin a lamp starting sequence until lamps are connected to the ballast.

REFERENCES:
patent: Re32901 (1989-04-01), Nilssen
patent: 4277728 (1981-07-01), Stevens
patent: 4463286 (1984-07-01), Justice
patent: 4513226 (1985-04-01), Josephson
patent: 5051662 (1991-09-01), Counts
patent: 5353214 (1994-10-01), Kim

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