Resistive lamp ballast with re-ignition circuit

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

H - Electricity

05

B

315/56

H05B 41/36 (2006.01) H05B 41/14 (2006.01)

Patent

CA 1210443

RESISTIVE LAMP BALLAST WITH RE-IGNITION CIRCUIT Abstract of the Disclosure 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 con- trol 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 cur- rent 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.

431415

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