Apparatus for coupling power into a body of gas

H - Electricity – 05 – H

Patent

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H05H 1/46 (2006.01) H01J 37/32 (2006.01) H01J 65/04 (2006.01)

Patent

CA 2332860

Apparatus for coupling power into a body of gas by induction to provide a gas discharge, comprises a source of a/c power (3) coupled to a circuit arrangement having an inductor comprising two coils (1, 2), each constituted by a respective elongate conductor, the conductors each having one end coupled to the circuit arrangement at opposite respective sides of the inductor, and having the other end at a floating potential. The mutual capacitance between the coils, together with the inductance of the inductor as a whole, constitute a balanced self-resonant circuit having a resonant frequency which is greater than 1 MHz and less than 100 MHz. This arrangement can reduce temperature variations in the resonant frequency and can reduce unwanted r.f. emissions.

Dispositif qui permet de coupler par induction de l'énergie à l'intérieur d'un corps gazeux afin de produire une décharge gazeuse. Le dispositif comprend une source (3) de courant alternatif, couplée à un agencement de circuit comportant un inducteur formé de deux bobines (1, 2). Chaque bobine est constituée par le conducteur allongé correspondant. Chaque conducteur est couplé par une de ses extrémités à l'agencement de circuit sur les côtés opposés de l'inducteur, et, par l'autre extrémité, à une tension flottante. La capacité mutuelle entre les bobines, avec l'inductance de l'inducteur dans sa totalité, constitue un circuit résonant à la fréquence propre équilibré, ayant une fréquence de résonance supérieure à 1 MHz et inférieure à 100 MHz. Cet agencement atténue les variations de température dans la fréquence de résonance, ainsi que les émissions RF indésirables.

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