Over-current protection device

Details Over-current protection device Over-current protection device

2007-10-23

2007-10-23

Lee, K. Richard (Department: 2832)

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

C338S328000, C338S332000, C252S512000, C252S518100

Reexamination Certificate

active

11654842

ABSTRACT:
An over-current protection device comprises two metal foils and a positive temperature coefficient (PTC) material layer laminated between the two metal foils. The PTC material layer includes: (1) a polymer substrate, being 35-60% by volume of the PTC material layer and including a fluorine-containing crystalline polymer with a melting point higher than 150° C., e.g., polyvinylidine fluoride (PVDF); and (2) a conductive ceramic filler (e.g., titanium carbide) distributed in the polymer substrate. The conductive ceramic filler is 40-65% by volume of the PTC material layer, and has a volume resistivity less than 500 μΩ-cm. The volume resistivity of the PTC material layer is less than 0.1 Ω-cm, and the ratio of the hold current of the PTC material layer at 25° C. to the area of the PTC material layer is between 0.05 and 0.2 A/mm2.

REFERENCES:
patent: 5793276 (1998-08-01), Tosaka et al.
patent: 6452476 (2002-09-01), Handa
patent: 6593844 (2003-07-01), Iwao et al.
patent: 6778062 (2004-08-01), Handa et al.
patent: 2002/0093007 (2002-07-01), Handa et al.
patent: 2004/0041683 (2004-03-01), Tosaka et al.

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