Ballast circuit for reducing striations in a discharge lamp

Details Ballast circuit for reducing striations in a discharge lamp Ballast circuit for reducing striations in a discharge lamp

1996-09-18

2000-05-30

Shingleton, Michael B.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315DIG7, 315247, 315224, 315219, H05B 2702

Patent

active

06069453&

ABSTRACT:
A circuit for operating a discharge lamp from input terminals of a low frequency (f) supply voltage source with a rectifier coupled to the input terminals for rectifying the low-frequency supply voltage. A capacitor is coupled to the output of the rectifier. A DC-AC converter is coupled to the capacitor for generating a lamp current which comprises a DC component and a high-frequency AC component, the amplitude of the high-frequency AC component being modulated with a low frequency which is equal to twice the frequency f. An apparatus (V) adjusts the lamp power. The circuit parameters are chosen such that during operation the average amplitude of the high-frequency lamp current component is at least 500 times the amplitude of the low-frequency modulation of the high-frequency lamp current component with the power set for its maximum adjustable value. As a result, the discharge lamp can be dimmed over a wide range without striations occurring.

REFERENCES:
patent: 4682082 (1987-07-01), Mac Askill et al.
patent: 5189343 (1993-02-01), Pacholok
patent: 5369339 (1994-11-01), Rejjnaerts
patent: 5382881 (1995-01-01), Farkas
patent: 5471117 (1995-11-01), Ranganath et al.

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