Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1982-01-19
1983-08-09
Dixon, Harold A.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315119, 315209SC, 315244, 315DIG2, H05B 3702
Patent
active
043981283
ABSTRACT:
Method for heating and igniting as well as controlling or regulating the light flux of low-pressure gas-discharge lamps, including a ballast having an inverter for generating an ac voltage at inverter output terminals from a dc voltage generated from an ac supply network by rectifiers, the ac voltage having a frequency higher than line frequency, the ballast including an L-C circuit having a capacitor and a first choke connected between one of the inverter output terminals and a lamp, the lamp being in turn connected to another of the inverter output terminals, a second choke shunted across the lamp, the charge of the capacitor being constantly reversed by the inverter with controllable frequency, which comprises changing the inverter frequency in accordance with the desired light flux with constant ac voltage amplitude at the outputs of the inverter, tuning the frequency, voltage, capacitor, first choke and second choke to each other, circulating substantially the required heating current through heating coils of the lamp at low frequency before the lamp is ignited, decreasing the heating current at rising frequency until substantially 40% of the rated light flux of the lamp is reached after the lamp is ignited, and decreasing the heating current to less than 25% of its initial value as the frequency continues to rise until the rated light flux of the lamp is reached, and an apparatus for carrying out the method.
REFERENCES:
patent: 3449629 (1969-06-01), Wiggert
patent: 3514668 (1970-05-01), Johnson
patent: 3753071 (1973-08-01), Engel et al.
patent: 4017761 (1977-04-01), Woldring
patent: 4207497 (1980-06-01), Chapwell et al.
patent: 4251752 (1981-02-01), Stolz
Brown Boveri & Cie Aktiengesellschaft
Dixon Harold A.
Greenberg Laurence A.
Lerner Herbert L.
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