Electronic ballast for gaseous discharge lamp operation

Details Electronic ballast for gaseous discharge lamp operation Electronic ballast for gaseous discharge lamp operation

1992-08-24

1994-07-19

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315307, 315291, 315DIG5, 315DIG7, H05B 3702

Patent

active

053312538

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.

REFERENCES:
patent: 4472057 (1984-09-01), Wurm et al.
patent: 4612479 (1986-09-01), Zansky
patent: 4677346 (1987-06-01), Roberts et al.
patent: 4700113 (1987-10-01), Stupp et al
patent: 4704563 (1987-11-01), Hussey

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