Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Patent
1992-10-26
1994-07-05
Mullins, James B.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
315 71, 315 72, 315 73, H01J 744
Patent
active
053270460
ABSTRACT:
A high intensity discharge (HID) lamp includes a resistive fuse for overcurrent protection of its associated ballast, which fuse is connected electrically in series with the discharge vessel of the lamp and continuously dissipates power during lamp operation. The resistive fuse is heated by passage of the operating current through the discharge vessel during lamp operation to a temperature substantially controlled by the operating current. In response to an increase in the operating current to a predetermined overcurrent, the resistive fuse reaches a temperature such that it breaks and disconnects the discharge vessel from its source of electric potential within a predetermined time period. The fuse passes short-term high starting currents and does not disconnect the discharge vessel during each lamp start-up at least until the operating current reaches the predetermined over-current during lamp life.
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U.S. patent application Ser. No. 07/966,245.
Luijks Gerard
Ravi Jagannathan
Dudek J.
Mullins James B.
North American Philips Corporation
Wieghaus Brian J.
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