Electronic ballast having a triac dimming filter with preconditi

Details Electronic ballast having a triac dimming filter with preconditi Electronic ballast having a triac dimming filter with preconditi

1995-03-31

1997-02-18

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315247, 315306, 315224, 315287, 315DIG4, G05F 100

Patent

active

056044119

ABSTRACT:
A dimming ballast for use with a phase control dimmer, and particularly a triac dimmer, includes an EMI filter selected with a high impedance to avoid excessive voltage and peak currents in the filter due to resonance with the phase controlled AC waveform at low conduction angles, when the load presented by the lamp is low. The EMI filter includes a filter capacitor connected at the output of a rectifier. The ballast also includes circuitry to sense the rectified DC voltage and to discharge the filter capacitor when the rectified voltage is at or near zero, to thereby keep the EMI filter loaded and prevent misfiring of the triac dimmer. In a favorable embodiment, the sensing and discharge function is carried out by a pre-conditioner of the switched-mode type.

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Research Dislosure No.: 34878, Entitled: "Electronic Fluorescent Ballast Compatible with an Incandescent Lamp Dimmer"no date.

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