Low EMI high intensity discharge RF driven lamp

Details Low EMI high intensity discharge RF driven lamp Low EMI high intensity discharge RF driven lamp

1995-06-07

1996-11-19

Pascal, Robert

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315267, 315338, 315344, H01J 100

Patent

active

055765998

ABSTRACT:
A high intensity discharge light source that uses a pseudo-random sequence generator to modulate an RF drive signal, and reduce electromagnetic interference (EMI) produced by the light source. The light source includes a high intensity RF discharge lamp, control and RF drive electronics that are coupled between a power source and the lamp. The control and drive electronics include an electromagnetic interference filter, and a regulator that outputs a bias voltage. The drive electronics provide RF power to the lamp, and includes an oscillator, a mixer/modulator, an amplifier, and an impedance matching network. The control circuit includes a pseudo-random sequence generator that generates a pseudo-random sequence of pulses to modulate the mixer/modulator and thus the output of the oscillator to thereby reduce the EMI spectral density generated in driving the RF discharge lamp.

REFERENCES:
patent: 4187447 (1980-02-01), Stout et al.
patent: 4383203 (1983-05-01), Stanley
patent: 4507796 (1985-03-01), Stumfall
patent: 5056912 (1991-10-01), Hamada et al.
patent: 5118196 (1992-06-01), Ault et al.

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