Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1993-10-19
1995-08-01
Mis, David
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315158, 315209R, H05B 4129, H05B 4139
Patent
active
054382394
ABSTRACT:
A power-line-operated inverter-type ballast powers one or more fluorescent lamps in a lighting fixture. The ballast comprises self-oscillating inverter means wherein the frequency of oscillation can be influenced by receipt of a control signal at a pair of control terminals connected in circuit with the inverter's positive feedback circuit. The ballast also comprises optical sensor means so positioned and constituted as to sense the light level within the lighting fixture and to provide a control signal commensurate with that light level. This control signal is then applied to the control terminals in such manner as to regulate the inverter frequency as a function of the light level, thereby correspondingly to regulate the magnitude of the current fed to the fluorescent lamps. By providing a threshold means in combination with high gain in the control loop, the fixture light level may be accurately maintained at any desired value substantially regardless of any changes in magnitude of power line voltage and/or in lamp efficacies. The inverter's positive feedback is attained by way of saturable current transformer means, and control of inverter frequency is attained by providing more or less heat to the saturable magnetic material of the current transformer means, thereby correspondingly to decrease or increase the saturation limits of this magnetic material; which, in turn, correspondingly increases or decreases the frequency of inverter oscillation.
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