Igniting circuit operated by varying the impedance value of the

Details Igniting circuit operated by varying the impedance value of the Igniting circuit operated by varying the impedance value of the

1997-07-07

1999-05-11

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315291, 315DIG5, 315360, H05B37/02;37/00

Patent

active

059031107

ABSTRACT:
A circuit arrangement for igniting and operating a discharge lamp (1) comprising inductive means, which include a primary winding (PRIM) which passes a high-frequency current during ignition and during lamp operation, and a secondary winding (SEC) which is magnetically coupled to the primary winding and electrically coupled to an impedance M (C1, C3) for limiting the current passed by the secondary winding. The current through the secondary winding generates a DC voltage via rectifying means, by which current a part of the circuit arrangement is supplied. The circuit arrangement is also provided with apparatus X (R, S1) for increasing the impedance value of the impedance M after ignition of the discharge lamp. The amplitude of the DC voltage is thereby at a desired level both before and after ignition of the discharge lamp, while no major power dissipation takes place during stationary lamp operation.

REFERENCES:
patent: 4532456 (1985-07-01), Knoll et al.
patent: 4937498 (1990-06-01), Bolhuis et al.
patent: 4949016 (1990-08-01), De Bijl et al.
patent: 5569984 (1996-10-01), Holtslag
patent: 5670849 (1997-09-01), Melai

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