Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Plural load device systems
Patent
1984-07-23
1985-06-25
Dixon, Harold
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Plural load device systems
315 97, 315105, 315177, 315189, 315222, 315226, 315DIG2, 315DIG7, H05B 3900
Patent
active
045256497
ABSTRACT:
The above and other objects, advantages and capabilities are achieved in one aspect of this invention by a drive scheme for a plurality, that is, for N, where N-2, flourescent lamps. The drive circuit comprises (N+1) pairs of output terminals, each comprising associated first and second individual terminals. An output transformer is coupled at one end to the (0,1).sup.1 terminal and at another end to the (0,1).sup.N+1 terminal. N impedance elements, typically capacitors, are coupled across associated pairs of lamp filaments in a fashion whereby each impedance element is coupled at one end to the second terminal of one pair and at another end to the second terminal of the succeeding pair. To wit: The first impedance element is coupled between the second terminal of the first pair, and the N.sup.th element is coupled between the second terminal of the N.sup.th pair and the second terminal of the (N+1).sup.th pair. The impedance elements, in whatever form, are characterized by a lower impedance than the lamps prior to ignition and a greater impedance subsequent ignition. As a result, the cathodes are heated prior ignition and power consumption of same is minimized subsequent ignition.
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Bay David L.
Knoll William C.
Dixon Harold
GTE Products Corporation
McNeill William H.
Odozynski John A.
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