Module for parallel lighting and balancer coil for discharge lamp
AssigneeHong-Fei Chen
InventorMasakazu Ushijima
Life of this patent
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Abstract
A small balancer coil for cold-cathode florescent lamps having sufficient shunt/balance effects, comprises a discharge lamp, a conductor located close to the discharge lamp, and two coils whose magnetic fluxes face each other. The magnetic fluxes generated in the coils face and cancel each other. Lamp currents of the discharge lamps are balanced by making the sum of the reactances of the mutual inductance of the balancer coil larger than the negative resistance of the discharge lamp. Section winding is applied to each coil of the balancer coil so as to maintain shunt and balance effects even in a small/flat balancer coil by making self-resonance frequency of each of the coils higher.
Claims9
A balancer coil for discharge lamps comprising:
- first and second coils wound around a common core in such a manner that currents flowing through the first and second coils generate respective magnetic fluxes in the core, at least one of the first and second coils being operably connected to an electrode of a respective one of the discharge lamps,
- wherein, during operation of the balancer coil,
- the respective magnetic fluxes are generated towards one another in the core such that the respective magnetic fluxes are substantially canceled out,
- a sum of reactances of mutual inductance of the balancer coil are larger than a negative resistance of each of the discharge lamps thereby balancing currents of the discharge lamps, and
- section winding or oblique winding or concentric winding is applied to each of the first and second coils of the balancer coil so as to make self-resonance frequency of each of the two coils higher than an operational frequency of the discharge lamps.
Dependencies are inferred from the claim text.