Method and apparatus for variable current control of a negative

Details Method and apparatus for variable current control of a negative Method and apparatus for variable current control of a negative

1981-11-30

1983-05-24

Dixon, Harold A.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315207, 315208, 315224, 315DIG4, G05F 100, H05B 3702

Patent

active

043852629

ABSTRACT:
A fluorescent lamp is adjusted in illumination intensity by controlling the DC current in the lamp during each alternate direct current flow through the lamp. The magnitude of the current applied to the lamp is set each time the direction of current through the lamp is switched, and the current change between switch times is limited. Inductors are used as current change limiting devices so that in each direction of current flow through the lamp, the current can not rapidly change. The amount of current is set, and the direction of current flow is switched when a current monitor detects that the current through one of the inductors is equal to the current desired for the operating point of the lamp. In this way, uniform selectable illumination levels may be achieved even though the lamp is operating in the negative resistance portion of its resistance characteristic.

REFERENCES:
patent: 4051412 (1977-09-01), Knoble et al.
patent: 4121136 (1978-10-01), Fournier et al.
patent: 4234823 (1980-11-01), Charlot

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