Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1995-04-13
1996-10-08
Gonzalez, Frank
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315291, 315308, 315DIG5, 315DIG7, G05F 100
Patent
active
055634770
ABSTRACT:
Method for operating a ballast for discharge lamps. The ballast comprises a rectifier for rectifying and filtering an AC line voltage, with the rectified voltage being smoothed with a capacitor and fed to an inverter, wherein the inverter drives a resonant lamp circuit that includes a gas discharge lamp, with the frequency of the inverter being generated by a voltage controlled oscillator and a control circuit, so that during normal operation of the lamp, the inverter frequency is chosen according to the current value of the rectified voltage, and during start-up of the ballast, the inverter frequency is lowered from a high starting frequency, while being continuously monitored to ensure the latter does not fall below a minimum frequency, with the value of the minimum frequency depending on the value of the rectified voltage, thus decreasing the dependence of the light flux on the rectified voltage and assuring a safe start-up process.
REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4723098 (1988-02-01), Grubbs
patent: 4873471 (1989-10-01), Dean et al.
patent: 5049790 (1991-09-01), Herfurth et al.
patent: 5138234 (1992-08-01), Moisin
patent: 5148087 (1992-09-01), Moisin et al.
European Search Report of Jul. 17, 1995.
Ribarich Thomas
Tobler Felix
Gonzalez Frank
Knobel AG Lichttechnische Komponenten
Ratliff Reginald A.
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