Over-current protection apparatus for high voltage

Details Over-current protection apparatus for high voltage Over-current protection apparatus for high voltage

2005-02-08

2005-02-08

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C338S0220SD, C338S0220SD

Reexamination Certificate

active

06853527

ABSTRACT:
The present invention discloses an over-current protection apparatus for high voltage, which connects the ceramic current-sensing element and polymer current-sensing element in series to form a novel over-current protection apparatus. By the characteristic of the polymer current-sensing element having higher switching off speed, the invention first responds to the over-current by raising its temperature, and then the heat is thermally conducted through the adhesive layer to the ceramic current-sensing element, resulting in a voltage drop produced by the over-current partially or predominantly received by the ceramic current-sensing element. Thus, the over-current protection device of the invention not only can endure high voltage (>600V), but also will not exhibit a negative temperature coefficient phenomenon.

REFERENCES:
patent: 4924074 (1990-05-01), Fang et al.
patent: 4967176 (1990-10-01), Horsma et al.
patent: 5166658 (1992-11-01), Fang et al.
patent: 5896264 (1999-04-01), Bijlenga et al.
patent: 6606023 (2003-08-01), Chiang et al.

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