Switching device having varying RC time period for ignition of a

Details Switching device having varying RC time period for ignition of a Switching device having varying RC time period for ignition of a

1996-03-11

1999-07-27

Shingleton, Michael B

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315224, 315DIG7, 315291, 315244, H05B 3702

Patent

active

059295732

ABSTRACT:
The invention relates to a switching device for operating a lamp by means of a high-frequency current, which switching device comprises a DC-AC converter whose oscillation frequency is determined by a timer circuit comprising a resistor and a capacitor. In accordance with the invention, the timer circuit also comprises a chain C which includes a switching element and which is used to increase the RC period of the timer circuit during ignition of the lamp, thereby increasing the amplitude of the voltage across the lamp.

REFERENCES:
patent: 3628086 (1971-12-01), Nuckolls
patent: 4525648 (1985-06-01), De Bijl et al.
patent: 4684851 (1987-08-01), Van Meurs
patent: 4712045 (1987-12-01), Van Meurs
patent: 5381077 (1995-01-01), McGuire
patent: 5404083 (1995-04-01), Nilssen
patent: 5414327 (1995-05-01), Reijnaerts

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