H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/24 (2006.01) H03L 7/06 (2006.01) H05B 41/282 (2006.01) H02M 7/538 (2006.01)
Patent
CA 2104624
ABSTRACT An embodiment of the present invention is a lighting system comprising a full-wave bridge, a filter capacitor, a control logic that drives a pair of output transistors and an output network that includes an output transformer that powers a pair of fluorescent lamps. The output transformer has a natural resonant frequency that will produce maximum power transfer to the lamps if the transistors are switched by the control logic at a rate near the natural resonant frequency. Precise frequency control within the control logic maintain consistent levels of output current through the lamps by phase lock loop (PLL) synchronizing its output switching frequency to the sixty Hz commercial line frequency as sampled through a resistor and a digital- integrator that prevents false triggering.
Smart & Biggar
Usi Lighting Inc.
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