H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/24 (2006.01) H05B 41/28 (2006.01)
Patent
CA 2091496
RD-21,327 MAGNETICALLY TUNABLE STARTING CIRCUIT FOR AN ELECTRODELESS HIGH INTENSITY DISCHARGE LAMP Abstract A series resonant starting circuit for providing a starting voltage to a starting probe for initiating an arc discharge in an electrodeless HID lamp includes an electrically variable inductance. The HID lamp is of a type having an excitation coil situated around an arc tube containing an ionizable fill in which the arc discharge is ignited. The electrically variable inductance includes a magnetic core having a main winding wound thereon that is coupled in series with a resonant capacitance. A bias winding is also wound on the magnetic core. Either the bias winding is coupled in series with a bias inductor, or, alternatively, the main and bias windings are configured on the magnetic core as a cross-field inductor. A bias circuit supply provides dc or relatively low-frequency ac current to the bias winding in order to vary the permeability of the magnetic core, and hence the inductance of the main winding, thereby tuning the starting circuit.
Anderson John Melvin
Cocoma John Paul
Farrall George Albert
Roberts Victor David
Company General Electric
Craig Wilson And Company
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