Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1992-06-22
1995-11-21
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315307, 315219, 315160, G05F 100
Patent
active
054690285
ABSTRACT:
In an electronic ballast, a half-bridge inverter drives a series-connected LC circuit near the LC circuit's natural resonance frequency. A relatively high-magnitude substantially sinusoidal 30 kHz output voltage develops across the tank-capacitor of the LC circuit. Each of several instant-start fluorescent lamps is series-connected with a current-limiting capacitor, thereby resulting in several lamp-capacitor series-combinations, each of which is connected across the tank-capacitor. The ballast is powered from ordinary 120 Volt/60 Hz power line voltage by way of a full-wave rectifier. At the DC output terminals of this rectifier exists a DC voltage having an instantaneous absolute magnitude equal to that of the power line voltage. Within the ballast, the inverter is powered from a DC supply voltage of constant magnitude about equal to the peak magnitude of the power line voltage. By interposing power-drawing circuitry in series with each lamp-capacitor combination, an auxiliary DC voltage is developed across a pair of auxiliary DC terminals. When no current flows from the auxiliary DC terminals, the magnitude of the auxiliary DC voltage is equal to that of the DC supply voltage. The maximum DC current available from the auxiliary DC terminals varies with the magnitude of the combined lamp currents and is adjusted so as to be equal to the peak magnitude of the current drawn from the power line; which current, as a result, is nearly sinusoidal.
REFERENCES:
patent: 3845350 (1974-10-01), Luursema
patent: 3906302 (1975-09-01), Wijsboom
patent: 4045711 (1977-08-01), Pitel
Pascal Robert J.
Ratliff Reginald A.
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