Circuit arrangement for controlling luminous flux of a discharge

Details Circuit arrangement for controlling luminous flux of a discharge Circuit arrangement for controlling luminous flux of a discharge

1996-07-09

1998-11-24

Kinkead, Arnold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315291, 315224, H05B 4100

Patent

active

058412468

ABSTRACT:
A circuit arrangement for the square-wave modulated high-frequency voltage operation of a discharge lamp, including means to control the duty cycle of the square wave, has a measuring circuit for detecting the ignition of the discharge lamp during each cycle of the substantially square-wave modulation and a timer circuit coupled to the measuring circuit for rendering the amplitude of the high-frequency voltage substantially equal to zero when a time interval has elapsed after the ignition of the discharge lamp, whereby the luminous flux of the discharge lamp fluctuates to a low degree only.

REFERENCES:
patent: 5105127 (1992-04-01), Lavaud
patent: 5243261 (1993-09-01), Bergervoet et al.

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