Compact igniter for discharge lamps

Details Compact igniter for discharge lamps Compact igniter for discharge lamps

H - Electricity

05

B

315/51, 315/59

H05B 41/14 (2006.01) H05B 41/04 (2006.01) H05B 41/18 (2006.01)

Patent

CA 1239979

11 ABSTRACT Compact igniter for discharge lamps. A ballast-igniter apparatus for a discharge lamp with a ballast impedance (6) connected in series with said lamp and a con- trolled semiconductor switching device (12) connected to the lamp electrodes (3, 4) for preheating said electrodes, a PTC resistor (19) in series with a timing capacitor (17) connected to one of the input terminals, said PTC resistor changing over to a high resistance state after it heats up whereby the voltage developed across the timing capacitor (17) is insufficient to trigger the semiconductor device (12) into conduction.

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