H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/67
H05B 41/14 (2006.01) H05B 41/04 (2006.01)
Patent
CA 1040702
ABSTRACT A circuit arrangement for supplying alternating cur- rent to an electric discharge lamp has a pair of input ter- minals for connection to an alternating voltage source and a series arrangement of a stabilizing inductor and lamp being connected across the input terminals. A circuit consisting of a semiconductor switch is connected in shunt with the lamp and a control circuit is provided for triggering the semi- conductor switch. This control circuit is coupled to a con- trol electrode of the semiconductor switch and includes a branch having an element with a relatively short time con- stant such that the switch is triggered on and off at least several times during every second half cycle of the alternat- ing voltage source. This arrangement operates in the operating condition of the lamp and, together with a stablilizing ballast, generates voltage peaks which ensure rapid reignition of the lamp at each half cycle of the alternating current supply.
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