Electric lamp and discharge devices: systems – With signal – indicator – or alarm
Patent
1992-10-02
1995-08-29
Mis, David
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
315151, 315158, H05B 3703, H05B 4138
Patent
active
054463424
ABSTRACT:
A lighting fixture is powered from an ordinary power line and has an inverter-type ballast for powering a fluorescent lamp. This ballast comprises an inverter means whose frequency of oscillation can be influenced by receipt of a control signal at a pair of control terminals. An optical sensor is located within the fixture in such manner as to intercept part of the light emitted by the fluorescent lamp. This sensor provides a control signal proportional to the amount of light emitted by the lamp, and this control signal is applied to the ballast 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 lamp. 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 efficacy. When lamp efficacy falls below some minimum level, a warning signal is provided.
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