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PTC current protection device

A current protection and PTC technology, applied in the field of PTC current protection devices containing PTC polymer materials, can solve problems such as improvement and insufficient stability, and achieve the effect of good reliability

Inactive Publication Date: 2019-07-02
FUZETEC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this type of PTC element is operated at a higher voltage (such as 12Vdc), its stability is still insufficient and needs to be improved

Method used

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  • PTC current protection device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]

[0025] 10.5g HDPE (purchased from Taiwan Plastic Industry Co., Ltd., product model: HDPE9002, as non-grafted polyolefin), 10.5g HDPE grafted with maleic anhydride (purchased from DuPont, product model: MB100D, used as the Carboxylic anhydride grafted polyolefin), and 279g tungsten carbide particles [produced in an environment at about 1750°C and in the presence of hydrogen, the total carbon content is 5.9wt%, and the average particle size is 2.0 μm (by Fischer microsieve Classifier FSSS measurement), as the first tungsten carbide particles of granular conductive filler 22] mixed ingredients in a mixer (brand: Brabender), with a temperature of 200 ° C, a stirring speed of 50 rpm and a pressurized weight of 5 kg The ingredients were mixed for 10 min to obtain a mixture.

[0026] The mixture is hot-pressed at a temperature of 200°C and a pressure of 80kg / cm 2 The conditions were hot-pressed for 4 min to form a thin sheet of PTC polymer material 2 with a thickness of 0...

Embodiment 2 and 3

[0028]

[0029] The process conditions of the test samples in Examples 2 and 3 (E2 and E3) are similar to those in Example 1, except that the usage amounts of the first tungsten carbide particles, HDPE and grafted HDPE were changed as shown in Table 1.

Embodiment 4 to 8

[0030]

[0031] The process conditions of the test samples in Examples 4 to 8 (E4-E8) are similar to those in Example 2, except that the total carbon content of the first tungsten carbide particles is changed as shown in Table 1.

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Abstract

Disclosed is a PTC current protection device. The device includes a PTC polymer material and two electrodes. The PTC polymer material includes a polymer substrate and a granular conductive filler dispersed in the polymer substrate. The two electrodes are attached to the PTC polymer material. The polymer substrate is made of a polymer composition containing non-grated polyolefins. The conductive filler comprises first tungsten carbide particles. Based on the total weight of the first tungsten carbide particles, the total carbon content of the first tungsten carbide particles is less than 6.0 wt%. The PTC current protective device can operate at a voltage of 12 Vdc and exhibits good reliability.

Description

technical field [0001] The invention relates to a PTC current protection device, in particular to a PTC current protection device comprising a PTC polymer material. Background technique [0002] A positive temperature coefficient (Positive temperature coefficient, PTC) device exhibits a positive temperature coefficient effect equivalent to that of a circuit protection device such as a resettable fuse. The PTC element includes a PTC polymer material, and a first electrode and a second electrode contacting two opposite surfaces of the PTC polymer material. [0003] The PTC polymer material includes a polymer substrate containing crystal regions and non-crystal regions, and granular conductive fillers. The granular conductive filler is dispersed in the amorphous region of the polymer substrate and forms a continuous conductive path for electrically connecting the first electrode and the second electrode. The positive temperature coefficient effect refers to a phenomenon that ...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01C7/13
CPCH01C7/027H01C7/13
Inventor 陈继圣江长鸿
Owner FUZETEC TECHNOLOGY CO LTD
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