Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1989-07-10
1990-05-22
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315106, 315DIG2, 315DIG7, H05B 3702
Patent
active
049280392
ABSTRACT:
In a power-line-operated inverter-type fluorescent lamp ballast with a high-Q parallel-loaded resonant L-C circuit series-connected across the inverter's output, subject invention provides for means to prevent the destructive overload that may occur during the lamp starting period or if the lamp is removed or somehow fails to operate. In this ballast, the unfiltered pulsed DC output of a full-wave power-line-supplied rectifier means is applied to a pair of inverters: an auxiliary inverter for pre-conditioning the fluorescent lamp, and a main inverter for powering the lamp. The auxiliary inverter starts operating immediately upon application of power from the power line, and therefore immediately starts the process of pre-conditioning. The main inverter, however, is not started until after the lamp has completed its conditioning, at which time the lamp will adequately load the series-resonant L-C circuit and thereby prevent destructive overload. If at any time the main inverter is operating, but if the lamp is removed or otherwise fails to adequately load the L-C circuit, the main inverter is immediately disabled for a pre-determined period.
REFERENCES:
patent: 4029993 (1977-06-01), Alley et al.
patent: 4045711 (1977-08-01), Pitel
patent: 4127798 (1978-11-01), Anderson
patent: 4184128 (1980-01-01), Nilssen
patent: 4188661 (1980-02-01), Bower et al.
patent: 4288831 (1981-09-01), Dolikian
patent: 4438372 (1984-03-01), Zuchtriegel
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