Starting circuit for an electrodeless high intensity...

Details Starting circuit for an electrodeless high intensity... Starting circuit for an electrodeless high intensity...

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/24 (2006.01) H05B 41/28 (2006.01) H05B 41/38 (2006.01)

Patent

CA 2068151

RD-20,854 IMPROVED STARTING CIRCUIT FOR AN ELECTRODELESS HIGH INTENSITY DISCHARGE LAMP Abstract A passive starting circuit for an electrodeless HID lamp includes a series resonant LC circuit including an inductor of variable impedance coupled in series with the parasitic capacitance between a starting probe and the excitation coil of the lamp, and further including a coupling capacitance for directly coupling the starting circuit to the excitation coil. The coupling capacitance is connected between the high terminal of the excitation coil, or a point in the circuit at approximately the same potential thereof, and a conductive support for holding the lamp and starting probe in a lamp fixture. In this way, the starting voltage is maximized for more efficient and rapid starting. Preferably, the series resonant capacitance of the starting circuit is optimized so that the ballast requires little, if any, retuning after the lamp has started.

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