Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1995-02-03
1996-08-27
Pascal, Robert
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315209R, 315224, 315307, 315DIG5, 315DIG7, 315244, H05B 3702
Patent
active
055504388
ABSTRACT:
A circuit for igniting and operating a discharge lamp includes a DC-AC converter provided with a first branch coupled to a DC voltage source and including at least one switching element for generating an alternating current at a frequency f. A load branch is coupled to the first branch and includes inductive means, capacitive means, and an inductor for coupling the lamp to the load branch. A control circuit switches the switching element at the frequency f and includes a resonant circuit of a further inductor and a further capacitor. An ignition voltage limiter includes a second branch coupled to the resonant circuit and comprising a series arrangement of a frequency-dependent impedance and a semiconductor element of variable impedance as a function of its control electrode potential. A third branch is coupled to the load branch and to the control electrode of the semiconductor element for influencing the potential of the control electrode dependent upon the lamp voltage. The voltages and currents in the circuit are thereby limited during lamp ignition.
REFERENCES:
patent: 4525648 (1985-06-01), De Bijl et al.
patent: 4954754 (1990-09-01), Nilssen
patent: 5036254 (1991-07-01), Shimizu
patent: 5097181 (1992-03-01), Kakitani
patent: 5172033 (1992-12-01), Smits
Blocker Edward
Franzblau Bernard
Kinkead Arnold
Pascal Robert
U.S. Philips Corporation
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