High pressure discharge lamp having overcurrent fuse protection

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements

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315 71, 315 72, 315 73, H01J 744

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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.

REFERENCES:
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patent: 3978443 (1976-08-01), Dennis et al.
patent: 4258288 (1981-03-01), Michael et al.
patent: 4755721 (1988-07-01), Okada et al.
patent: 4792782 (1988-12-01), Hammond
patent: 4901051 (1990-02-01), Murata et al.
patent: 5008583 (1991-04-01), Carleton
patent: 5015916 (1991-05-01), Mazza et al.
patent: 5159242 (1992-10-01), Ravi
U.S. patent application Ser. No. 07/966,245.

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