THERMALLY-PROTECTED BALLAST FOR HIGH-INTENSITY-DISCHARGE LAMPS

摘要

A ballast (100) for electrical lighting fixtures with improved thermal protection features. The ballast has ballast laminations (16), primary (18) and secondary (20) coils, and a thermal protector (12), the thermal protecto r being wired in series with the secondary coil. When the ballast is of the ty pe having multiple input voltage taps on the primary coil; the electrical positioning of the thermal protector in series with the secondary coil cause s 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.