Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1995-09-19
1998-04-07
Pascal, Robert
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315101, H05R 3702
Patent
active
057368171
ABSTRACT:
The cathodes of a fluorescent lamp are preheating and the medium between the cathodes is ignited into a plasma by heating the cathodes for a predetermined warm-up time period by conducting current from a supply power source through the cathodes for a conductive time interval, and applying a relatively high voltage starting pulse to the cathodes at the end of the conductive time interval or alternatively suppressing the high voltage starting pulse during the predetermined warm-up time period. Suppressing the high voltage starting pulse during the warm-up time period, thereby preventing erosion the thermionic coating of the cathodes due to positive ion bombardment. A controllable semiconductor switch is connected to the cathodes to control the current flow through them. The high voltage starting pulse is derived from commutating the semiconductor switch into a nonconductive state when the applied current level drops to the characteristic holding current value of the switch. The high voltage starting pulse is suppressed by triggering the semiconductor switch at the time when it would otherwise be commutating to the nonconductive state.
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Johnson Samuel A.
Noble Glenn A.
Rothenbuhler Dan E.
Seubert Jon P.
Beacon Light Products, Inc.
Ley John R.
Pascal Robert
Shingleton Michael
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