Electronic ballast circuit with lamp dimming control

Details Electronic ballast circuit with lamp dimming control Electronic ballast circuit with lamp dimming control

1991-09-30

1993-03-30

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, 315291, H05B 3702

Patent

active

051987260

ABSTRACT:
A circuit arrangement for operating a discharge lamp having a load branch provided with lamp connection terminals and coupled to a branch of a DC-AC converter. The branch of the converter includes at least one switching element for generating and supplying a current of alternating polarity to the load branch by being alternately conductive and non-conductive at a frequency f. A drive circuit makes the switching element alternately conductive and non-conductive at the frequency f. A control circuit is coupled to the drive circuit and to the discharge lamp for generating a control signal which is dependent on the lamp current and serves to influence the frequency. The control signal is also dependent on a signal S which is a measure of comparatively rapid changes in the power consumed by the discharge lamp. The lamp power thus can be adjusted over a wide range irrespective of the type of discharge lamp used.

REFERENCES:
patent: 3913002 (1975-10-01), Steigerwald
patent: 4894587 (1990-01-01), Jungreis
patent: 4906901 (1990-03-01), Carroll
patent: 5066894 (1991-11-01), Klier
patent: 5075602 (1991-12-01), Overgoor
patent: 5097181 (1992-03-01), Kakitani
patent: 5103142 (1992-04-01), Daub

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