Dimming fluorescent ballast system with shutdown control circuit
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United States of America Patent
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Sep 20, 2011
Grant Date -
Dec 17, 2009
app pub date -
Jun 16, 2008
filing date -
Jun 16, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A ballast system for, and a method of, controlling illumination of a lamp, include a dimmer switch having an actuator settable at different settings corresponding to different output voltages across the dimmer switch, a dimming electronic ballast operatively connected to an electrical power source and to the dimmer switch for dimming the lamp upon setting of the actuator, and a shutdown circuit, preferably provided in the ballast, for measuring the output voltages across the dimmer switch, and for automatically powering the ballast off and, in turn, for turning the lamp off when one of the voltages measured by the shutdown circuit does not exceed a reference voltage that corresponds to one of the settings of the actuator.
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