Electronic lamp ballast dimming control means

Details Electronic lamp ballast dimming control means Electronic lamp ballast dimming control means

1991-12-30

1992-11-17

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315226, 315282, 315307, 315DIG4, 315DIG5, H05B 41391

Patent

active

051650533

ABSTRACT:
An electronic ballast including a dimming circuit for use with fluorescent lamps. An electromagnet located adjacent to a dual toroid coil transformer employed as part of a inverter circuit is used to control the saturation of the toroid coil to the control the on and off times of transistors included in the inverter circuitry, to limit saturation thereby controlling the intensity of the light emitted from the fluorescent lamps.

REFERENCES:
patent: 2915637 (1959-12-01), McAdam
patent: 4286195 (1981-08-01), Swinen, Jr.
patent: 4558262 (1985-12-01), Longenderfer et al.
patent: 4568870 (1986-02-01), Chikuma
patent: 4792729 (1988-12-01), Peters
patent: 4937504 (1990-06-01), Black, Jr. et al.
patent: 4950963 (1990-08-01), Sievers
patent: 4994718 (1991-02-01), Gordin
patent: 4998046 (1991-03-01), Lester
patent: 5004959 (1991-04-01), Nilssen

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