Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1978-12-29
1981-01-13
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315DIG2, 315DIG5, 315DIG7, 315239, 315209R, 331113A, H05B 3700, H05B 3900, H05B 4114
Patent
active
042451779
ABSTRACT:
A dc to ac inverter for operating a gaseous discharge lamp through pre-ignition, arc stabilization, warm-up and final run states is disclosed. The arrangement comprises a transformer and a pair of transistors connected for alternate conduction in a self-oscillating configuration in which turn off occurs at a predetermined flux level in each conduction period. The flux limit is used to preclude excess current drain during warm-up when the lamp resistance is at a minimum. A capacitor is provided, resonant at a harmonic of the inverter output waveform for producing the enhanced output voltage required for pre-ignition. The capacitor also helps to maintain a higher harmonic content during warm-up, enhancing the effective ballasting reactance during that period in relation to that during final run operation. A shift of the oscillating frequency of the inverter from pre-ignition to final run operation further enhances inverter operation.
REFERENCES:
patent: 4002999 (1977-01-01), Hesler et al.
patent: 4060751 (1977-11-01), Anderson
patent: 4127798 (1978-11-01), Anderson
Baker Carl W.
Chatmon, Jr. Saxfield
General Electric Company
Lang Richard V.
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