Electronic ballast with interface circuitry for phase angle dimm

Details Electronic ballast with interface circuitry for phase angle dimm Electronic ballast with interface circuitry for phase angle dimm

1995-03-31

1996-09-24

Pascal, Robert

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315307, 315DIG4, 315219, 315209R, 315224, H05B 3702

Patent

active

055593950

ABSTRACT:
A gas discharge lamp dimming ballast has a two wire input for connection to the hot dimmed and neutral leads of a phase control dimmer. The ballast has an improved topology in which a pre-conditioner supplies a substantially constant DC voltage to a ballast stage including an inverter, a resonant tank output and a control circuit. A dimming interface circuit derives a dimming signal having a voltage equal to the average value of the rectified output voltage of a full-bridge rectifier feeding the pre-conditioner circuit. The dim signal is independent of the DC rail voltage and, in combination with the maintenance of a substantially constant DC rail voltage, permits of improved dimming control while providing the ease of installation of a two wire ballast. The response time of the interface circuit relative to the pre-conditioner is selected to avoid power imbalances. The ballast also includes an EMI filter and circuitry to prevent capacitive hold-up by the EMI filter of the rectified voltage to preserve the conduction angle for the interface circuit.

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Research Disclosure No.: 34878, Entitled: "Electronic Fluorescent Ballast Compatible With An Incandescent Lamp Dimmer". Dated before the invention thereof by applicant.

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