Two-stage resonant starting circuit for an electrodeless...

Details Two-stage resonant starting circuit for an electrodeless... Two-stage resonant starting circuit for an electrodeless...

H - Electricity

01

J

H01J 65/04 (2006.01) H01J 61/54 (2006.01) H05B 41/04 (2006.01) H05B 41/24 (2006.01) H05B 41/38 (2006.01)

Patent

CA 2056553

RD-20,855 TWO-STAGE RESONANT STARTING CIRCUIT FOR AN ELECTRODELESS HIGH INTENSITY DISCHARGE LAMP Abstract A starting circuit for an electrodeless HID lamp provides a two-stage resonant starting signal to a gas probe starter of the type comprising a starting chamber which contains a relatively low-pressure gas and is attached to the outer wall of the arc tube. The starting circuit comprises a resonant LC circuit of variable impedance including the series combination of a variable inductance and the parasitic capacitance between the gas probe starter and the excitation coil. In operation, the resonant circuit is tuned to a predetermined value so that, upon application of an RF signal to the excitation coil, resonant operation of the starting circuit results in the application of a sufficiently high starting voltage to the starting chamber to ignite a low- current glow discharge therein. Once the glow discharge is ignited, the starting circuit is retuned to ensure that a sufficiently high starting voltage is capacitively coupled to the arc tube to ionize the arc tube fill and initiate an arc discharge therein.

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