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Overcurrent protection component

An overcurrent and component technology, applied in the field of overcurrent protection components, can solve the problems of small maintenance current, high resistance, and inability to effectively increase heat dissipation efficiency.

Active Publication Date: 2010-05-19
POLYTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The components traditionally using carbon black as conductive filler have high resistance, which maintains the current I hold Small, (the maintenance current is the maximum current without triggering), so the heat dissipation efficiency cannot be effectively increased

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0013] The following will take the addition of different proportions of PVDF as an example to illustrate the characteristics of the conductive polymer of the present invention and the overcurrent protection component composed of it.

[0014] Table 1 shows the formula ingredients of each experimental group (Ex.1 to Ex.6) and the control group (Comp.1 and Comp.2) shown in volume percentage, wherein the carbon black as the conductive filler is selected from Columbia Chemical Company (Columbian Chemical Company ) produced model RAVEN 430ULTRA product, titanium carbide ceramic powder used as conductive filler is model TI-302 product produced by Micron Metals, Inc.; high density polyethylene (HDPE) of polyolefin polymer substrate is selected The model TAISOX HDPE-8010 product produced by Formosa Plastics, Inc., and the PVDF are selected from the model KYNAR741 and KYNAR761 products of ATOFINA Chemical Company.

[0015] Table I

[0016]

Titanium carbide

TiC

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Abstract

The invention discloses an overcurrent protection component, comprising two metal foils and a positive temperature coefficient (PTC) material layer which is piled between the two metal foils. The PTCmaterial layer comprises: (1) the high molecular polymer backing material, the percentage by volume of the high molecular polymer backing material is from 35 to 60 percent; moreover, the high molecular polymer backing material comprises the fluoride bearing crystallinity high molecular polymer (such as the polyvinylidine fluoride; PVDF) of which the melting pointing is above 150 DEG C; and(2) theconducting ceramic filler(ex. the titanium carbide), the conducting ceramic filler is separately arranged in the high molecular polymer backing material. The percentage by volume of the conducting ceramic filler is from 40 to 65 percent, the volume resistance of the conducting ceramic filler is less than 500u ohm-cm. The volume resistance of the PTC material layer is less than 0.1u ohm-cm; when the temperature is 25 DEG C, the rate between the standby current and the area of the PTC material layer is 0.05 to 0.2 A / mm<2>.

Description

technical field [0001] The present invention relates to an overcurrent protection component, more particularly, to an overcurrent protection component with high hold current. 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 components, and has been widely used in overcurrent protection components or circuits. on the component. Because the resistance of the PTC conductive composite material can maintain an extremely low 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 battery, its resistance value will instantly increase to a high resistance state (at least 10 4 ohm), which is the so-called trip, and the excessive current is counteracted in reverse to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/13H01C7/02
Inventor 王绍裘游志明
Owner POLYTRONICS TECH
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