Resistive lamp ballast with re-ignition circuit

Details Resistive lamp ballast with re-ignition circuit Resistive lamp ballast with re-ignition circuit

1984-09-20

1985-08-20

Dixon, Harold

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Filament or electric heater in series with a discharge...

315176, 315179, 315185R, 315307, 315 58, H01J 744, H05B 3702

Patent

active

045366802

ABSTRACT:
A discharge lamp is provided with a resistive ballast together with means for sensing lamp voltage conditions. If the lamp voltage exceeds a predetermined threshold then a control circuit operates to apply the output of a relatively high frequency oscillator to the lamp to achieve lamp re-ignition which must be accomplished twice during each alternating current cycle. Lamp re-ignition is necessitated by lamp current zero-crossing which occurs as a result of powering the lamp from an alternating current energy source.

REFERENCES:
patent: 4331905 (1982-05-01), Owen
patent: 4340843 (1982-07-01), Anderson
patent: 4350929 (1982-09-01), Katoogi
patent: 4356433 (1982-10-01), Linden
patent: 4376911 (1983-03-01), Kaneda
patent: 4471268 (1984-09-01), Brown et al.
patent: 4484107 (1984-11-01), Kaneda

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