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Reduced voltage stress across leads between a ballast and a metal halide lamp Disclosure Number: IPCOM000008523D
Publication Date: 2002-Jun-20
Document File: 1 page(s) / 20K

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The Prior Art Database


ID606240 and ID606242

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Reduced voltage stress across leads between a ballast and a metal halide lamp

Metal halide lamps as a class of high intensity discharge (HID) lamps require high ignition voltages in the range of 3 to 4.5kV and for systems featuring hot restrike ignition, the ignition voltage may reach even 20kV. To cope with so excessive voltages, high voltage isolation has to be implemented for both the leads towards the lamp as well as the connectors of the leads.

This imposes very rigorous specifications on HID lamp system design, which is a drawback.

The drawback is largely remedied by combining the lamp with an integrated interface-ignitor. In this way the lamp ignition voltage is generated by the circuit in the immediate proximity of the lamp, thus high voltage is not present across any wires outside the lamp-ignitor system. Since the parameters of the ignition voltage can be adjusted by the design of the integrated ignitor, the input voltage to the ignitor can have a substantially lower value.

The thus formed new HID lamp system is of particular interest for indoor lighting applications.

An additional advantage of this new development is that new application areas with very stringent safety regulations become available.