Driver circuit for discharge lamps

Details Driver circuit for discharge lamps Driver circuit for discharge lamps

1995-04-14

1996-08-27

Gonzalez, Frank

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315106, 315 86, 315 88, H05B 3900

Patent

active

055504337

ABSTRACT:
Driver circuit for discharge lamps. The driver circuit contains an inverter driving a lamp circuit with a discharge lamp and the current in the lamp circuit is measured as a voltage U.sub.ILC over a resistor, with a control circuit comprising a strike detector that determines if the lamp did strike during a start-up phase of the driver, and if not, the inverter is switched off, with the control circuit going into a monitoring state where it operates the inverter for short periods at regular intervals, and during each such period, the voltage U.sub.ILC is monitored to detect a removal or an insertion of a lamp, so that, once the lamp has been replaced, a new start-up phase begins.

REFERENCES:
patent: 3356891 (1967-12-01), Godard
patent: 4063108 (1977-12-01), Klett et al.
patent: 5426347 (1995-06-01), Nilssen

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