Discharge lamp fast preheat circuit independent of type of balla

Details Discharge lamp fast preheat circuit independent of type of balla Discharge lamp fast preheat circuit independent of type of balla

1994-10-07

1995-12-19

Pascal, Robert J.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315107, 315105, 315208, 315244, 315DIG7, H05B 3904

Patent

active

054771099

ABSTRACT:
A circuit arrangement for preheating electrodes of a discharge lamp connected in series with a ballast by means of a supply voltage of alternating polarity. The circuit arrangement is provided with a switching element (S) which shunts the lamp and which is operated by means of a control signal. A circuit portion (II) adjusts both the phase and the frequency of the control signal in dependence on whether the ballast is inductive or capacitive. The electrodes of the lamp are preheated in a short period both for an inductive ballast and for a capacitive ballast.

REFERENCES:
patent: 3919590 (1975-10-01), Remery et al.
patent: 3924155 (1975-12-01), Vogeli
patent: 4177403 (1979-12-01), Remery
patent: 4253043 (1981-02-01), Chemin et al.
patent: 4380719 (1983-04-01), De Bijl et al.

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