Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1993-09-27
1995-05-30
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315330, 315335, 315340, 315351, 315354, 315DIG1, 315DIG4, G05F 100
Patent
active
054204810
ABSTRACT:
An apparatus is provided for controlling the luminous output of a fluorescent lamp over a wide dimming range. The luminous output is controlled by controlling the lamp current, while the lamp is immersed in a lateral electrostatic field. The lamp and external electrostatic ionization electrodes are driven by a true analog voltage-to-current converter that has a dynamic range inherently wider than conventional PWM circuits. A modified, transformer coupled, push-pull converter with an analog-current-driven primary circuit is used in one embodiment of the apparatus. The lamp driver must be capable of providing a high compliance voltage consistent with the I-V profile of the lamp. A subordinate primary winding on the transformer may be used to reduce magnetization current and to supply sufficient energy for supporting the lateral electrostatic field that is generated by the ionization electrodes which may be printed on a PWB mounted behind the lamp.
REFERENCES:
patent: 2864035 (1958-12-01), Davis
patent: 3890540 (1975-06-01), Ott
patent: 5030894 (1991-07-01), Yoshiike et al.
Casella Anthony J.
Hespos Gerald E.
Pascal Robert J.
Ratliff Reginald A.
Smiths Industries
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