Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Plural load device systems
Patent
1985-04-22
1987-02-03
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Plural load device systems
315224, 315244, 315DIG7, 315209R, 315226, H05B 3702
Patent
active
046410619
ABSTRACT:
A solid state ballast for starting and operating a plurality of fluorescent lamps comprises a plurality of parallel connected, series LC circuits each coupled by a capacitor to a lamp so that voltage existing across the series capacitors is applied across the lamps and driven by an inverter at a DC power source voltage and at a selected frequency high enough to develop a lamp starting voltage but substantially below their resonant frequency. After starting the resonant frequency of the LC circuits is reduced substantially below the selected frequency by the added capacitive reactances of the coupling capacitors whereby the destructive high voltage at the upper and lower resonances is avoided and the independent selection of the values of L and C and the coupling capacitors to control starting voltage and conduction after starting at the selected frequency is provided.
REFERENCES:
patent: 3753071 (1973-08-01), Engel
patent: 4045711 (1977-08-01), Pitel
patent: 4053813 (1977-10-01), Kornrumpf
patent: 4525648 (1985-06-01), DeBijl et al.
patent: 4544863 (1985-10-01), Hashimoto
Dixon Harold
Emerson Electric Co.
Markham Charles E.
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