Controlled-frequency series-resonant ballast

Details Controlled-frequency series-resonant ballast Controlled-frequency series-resonant ballast

1987-06-09

1989-07-25

Groody, James J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315244, 315282, 315284, 363 98, 363132, H05B 3702

Patent

active

048517399

ABSTRACT:
In a self-oscillating inverter-type fluorescent lamp ballast, the inverter's output is a squarewave voltage of frequency controllable about 30 kHz. The squarewave voltage is applied across a series-connected high-Q L-C circuit. The fluorescent lamp is connected in parallel with the tank capacitor of this L-C circuit. Before the lamp ignites, the magnitude of the voltage developing across the tank capacitor is a sensitive function of the frequency of the squarewave voltage and is controlled to a suitable level by correspondingly controlling the frequency of the squarewave voltage to be higher than the natural resonance frequency of the unloaded L-C circuit. After the lamp has ignited, the magnitude of the lamp current is a sensitive function of the frequency of the squarewave voltage and is controlled to a suitable level by correspondingly controlling the frequency of the squarewave voltage.

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