Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1996-09-18
1998-06-16
Pascal, Robert
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315224, 315307, 315306, 315DIG7, H05B 4116
Patent
active
057676305
ABSTRACT:
Power supply and control circuits are provided for driving a fluorescent lamp with a differential drive voltage from a low voltage DC power source. In one embodiment, the lamp is driven by a transformer having a primary and two independent secondary windings which produce the differential drive signal. A feedback signal indicative of the magnitude of current conducted by the lamp is produced from one of the secondary windings that is coupled to the control circuit so that the feedback signal is directly proportional to the energy required to light the lamp. In another embodiment, the lamp is driven by two independent transformers that are both driven by the control and drive circuit. The two secondary windings are each connected to one end of the lamp so that the lamp is driven by a differential drive signal. One of the secondary windings is also coupled to the control and drive circuit to provide a feedback signal indicative of the magnitude of current conducted by the lamp.
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Linear Technology Corporation
Morris Robert W.
Pascal Robert
Philogene Haissa
Rowland Mark D.
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