H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/36
H05B 33/08 (2006.01) H05B 41/24 (2006.01) H05B 41/285 (2006.01) H05B 41/298 (2006.01)
Patent
CA 1042064
ABSTRACT OF THE DISCLOSURE The present invention relates to an improved circuit used to supply operating power to fluorescent lamps. Conventional ballasts for fluorescent lamps are large, heavy, expensive, and electrically inefficient, wasting a substantial percentage of the power supplied to the lamp installation. The present invention eliminates the need for a ballast and offers a unique use for a switching arrangement. According to the invention, there is provided a circuit employing an oscillator having a feedback loop for supplying operating current at a frequency in the range 20-25 killohertz to a pair of fluorescent lamps connected in series. The heater filament of the first lamp is made a series element in the feedback loop of the oscillator, so that removal of that lamp disables the oscillator. Switching means is provided to bypass the open socket terminals of the second lamp when it is removed from its sockets, permitting power to continue to be supplied to the first lamp.
269215
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