Thermally-protected ballast for high-intensity-discharge lamps

Details Thermally-protected ballast for high-intensity-discharge lamps Thermally-protected ballast for high-intensity-discharge lamps

2005-10-25

2005-10-25

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S239000, C315S276000

Reexamination Certificate

active

06958579

ABSTRACT:
A ballast for electrical lighting fixtures has improved thermal protection features. The ballast has ballast laminations, primary and secondary coils, and a thermal protector, the thermal protector being wired in series with the secondary coil. When the ballast is of the type having multiple input voltage taps on the primary coil, the electrical positioning of the thermal protector in series with the secondary coil causes the wiring assembly of the thermal protector (as part of the ballast) to be independent of the primary coil input voltage tap used in a particular application. Improved electrical lighting circuits for high-intensity-discharge lamps may be obtained, the circuits having the above-described thermally-protected ballasts.

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