Electronic lamp ballast dimming control means employing pulse wi

Details Electronic lamp ballast dimming control means employing pulse wi Electronic lamp ballast dimming control means employing pulse wi

1991-12-30

1993-05-18

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315209R, 315226, 315291, 315DIG4, H05B 4129, H05B 41391

Patent

active

052124274

ABSTRACT:
An electronic ballast for use with fluorescent lamps including a dimming means consisting of a permanent magnet supported over and in proximity to a dual toroid coil assembly utilized as part of an included inverter circuit included in the ballast. The permanent magnet is movable to control the amount of saturation of the transformers thus determining the width of pulses generated by the transistors included in the inverter circuit and thereby controlling the intensity of light emitted from the fluorescent lamps.

REFERENCES:
patent: 2915637 (1959-12-01), McAdam
patent: 4677345 (1987-06-01), Nilssen
patent: 5004959 (1991-11-01), Nilssen

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