Method and driving circuit for HID lamp electronic ballast

Details Method and driving circuit for HID lamp electronic ballast Method and driving circuit for HID lamp electronic ballast

1999-05-14

2000-11-07

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315209R, 315224, 315DIG5, G05F 100

Patent

active

061441724

ABSTRACT:
A circuit arrangement and method thereof for operating high intensity discharge (HID) lamps with a lower frequency rectangular current waveform, in which the frequency of the higher frequency ripple superimposed on the lower frequency rectangular current is modulated by a pseudo-random noise signal. The pseudo-random noise may be generated by a feedback shift register. The feedback shift register may incorporate run length interrupt logic to address PWM frequency stagnation by reducing the longest run length or lengths of the feedback shift register. The feedback shift register may also or alternatively include an RC low pass analog filter to address PWM frequency stagnation. The center frequency and frequency band of the pseudo-randomly generated noise may be adjustable.

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"White-Noise Modulation of High-Frequency High-Intensity Discharge Lamp Ballasts", Laszlo Laskai, IEEE Industrial Applications Society Conference, 1994 (IEEE Pub. 0-7803-1993-1/1994).
"High-Frequency Ballasting Techniques for High-Intensity Discharge Lamps", Laszlo Laskai, Ph.D. Dissertation, Texas A&M University, Dec., 1994.
"How to Build and Test a 5 stage PN Generator", Spread Spectrum Scene, World Wide Web url: http://www.sss-mag.com/png0.html, printed on Mar. 30, 1999.

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