Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1985-01-22
1987-03-24
Moore, David K.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315246, 315287, 315307, H05B 3702
Patent
active
046527974
ABSTRACT:
A source of 120 Volt/60 Hz power line voltage is full-wave-rectified and yields an unfiltered DC voltage pulsed at 120 Hz rate. This pulsed DC voltage is applied to an inverter of a type that must be triggered into oscillation. At the beginning of each of the DC voltage pulses, the inverter is triggered into oscillation; and at the end of each of the DC voltage pulses, the inverter ceases to oscillate frm lack of adequate voltage to sustain oscillation.
The output of the inverter is a 30 kHz squarewave voltage amplitude modulated at the 120 Hz rate. Across the inverter output is connected a high-Q series L-C circuit resonant at about 30 kHz. A fluorescent lamp is connected in parallel with the tank capacitor of the L-C circuit.
With is high-Q resonant L-C circuit series-excited and parallel-loaded, the instantaneous magnitude of the current drawn by the inverter is substantially proportional to the instantaneous magnitude of the DC voltage provided; which implies that power is drawn from the power line with a relatively high power factor.
REFERENCES:
patent: 4045711 (1977-08-01), Pitel
patent: 4109307 (1978-08-01), Knoll
patent: 4388561 (1983-06-01), Koshimura et al.
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