| 摘要 |
A ballast for electrical lighting fixtures with improved thermal protection features has ballast laminations, primary and secondary coils, and a thermal protector, the thermal protector being wired in series with the secondary coil. The ballast preferably is of the type having multiple input voltage taps on the primary coil; in such cases, 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 have the above-described thermally-protected ballasts.
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