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Over current protection element

A technology for protecting components and overcurrent, applied in the direction of current response resistors, etc., can solve the problems of resistance rise, easy oxidation, poor resistance reproducibility, etc., and achieve the effect of cost reduction

Active Publication Date: 2009-04-15
POLYTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, if nickel is not tightly protected and insulated from air, it will be easily oxidized after a period of time, resulting in an increase in resistance.
In addition, after the conductive composite material is tripped, its resistance reproducibility is not good

Method used

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Embodiment Construction

[0016] The composition and manufacturing process of a preferred embodiment of the overcurrent protection device of the present invention are described below.

[0017] The composition and the weight of the used PTC material layer of the overcurrent protection element of the present invention are as follows: crystalline polymer-(HDPE density: 0.962g / cm 3 , 12.11g), crystalline polymer two (HDPE density: 0.943g / cm 3 , 3.03g), non-conductive filler (magnesium hydroxide: 4.2g) and conductive filler (titanium carbide: 85.75g). The particle size of titanium carbide is between 0.1 μm and 10 μm. The first and second crystalline polymers are high-density polyethylene.

[0018] The production process is as follows: set the feeding temperature of the batch mixer (Hakke-600) at 160°C, and the feeding time is 2 minutes. The feeding procedure is to first add a certain amount of crystalline polymer, stir for a few seconds, and then add conductive Filler (titanium carbide with a particle si...

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Abstract

The invention relates to an over-current protector, which comprises two metal foils and one positive-temperature coefficient PTC layer, wherein said PTC layer is between two metal foils and contains at least one crystal polymer, one oxygen-free conductive ceramic stuff and one non-conductive stuff; the diameter of conductive stuff has certain size and the volume resistance of said PTC layer is lower than 0.1omega-cm.

Description

technical field [0001] The present invention relates to an overcurrent protection element, more particularly, an overcurrent protection element with a PTC conductive composite material, the overcurrent protection element has a preferred volume resistance value and resistance reproducibility, and is especially suitable for mobile Power supply protection for communication equipment. Background technique [0002] Since the resistance of conductive composite materials with positive temperature coefficient (Positive Temperature Coefficient; PTC) characteristics is sensitive to temperature changes, it can be used as a material for current sensing elements, and has been widely used in overcurrent protection elements or circuit components. Since the resistance of the PTC conductive composite material can maintain the lowest value at normal temperature, the circuit or battery can operate normally. However, when an over-current or over-temperature phenomenon occurs in the circuit or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/13
Inventor 王绍裘朱复华罗国彰
Owner POLYTRONICS TECH