Apparatus for coupling power into a body of gas
AssigneeCentral Research Laboratories Limited
InventorIan Macdonald Green
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Abstract
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.
Claims6
Apparatus for coupling power into a body of gas by induction to provide a gas discharge, comprising:
- an input for a/c power coupled to an inductor comprising a plurality of turns of a conductor surrounding a space having a body of gas, the inductor comprising two coils, each of the two coils comprising a respective elongate conductor;
- wherein the two coils each has one end coupled to the input for a/c power at either side of the inductor, and each has the other end at a floating potential.
Apparatus as claimed in any preceding claim, wherein:
- the apparatus is included in a drive circuit of an electrodeless lamp.
Dependencies are inferred from the claim text.