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positive temperature coefficient element

A positive temperature coefficient and component technology, applied in the direction of resistors with positive temperature coefficients, electrical components, non-adjustable metal resistors, etc., can solve the problem of reducing the PTC trigger temperature, no teaching, no teaching low molecular weight organic compound melting temperature concentration to achieve the effect of high maintenance current

Active Publication Date: 2018-05-18
POLYTRONICS TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

This technology does not teach how to generate the PTC effect through the melting expansion of low molecular weight organic compounds, nor does it teach how to achieve high sustaining current and reduced PTC at 60°C at the same time by increasing the concentration of the melting temperature of low molecular weight organic compounds trigger temperature

Method used

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Embodiment Construction

[0028] In order to make the above and other technical contents, features and advantages of the present invention more comprehensible, the following specifically cites relevant embodiments, together with the accompanying drawings, for a detailed description as follows.

[0029] The structure of the PTC element of the present invention is exemplified as figure 1The PTC element 10 includes two electrode layers 12 and a PTC material layer 11 stacked between the two electrode layers 12 . The PTC material layer 11 includes crystalline high molecular polymer, conductive ceramic filler and crystalline low molecular weight organic compound. The crystalline high molecular polymer is used as the base material of the PTC material layer 11, and the conductive ceramic filler and the crystalline low molecular weight organic compound are uniformly dispersed in the base material formed by the crystalline high molecular polymer. The crystallinity of crystalline low-molecular-weight organic com...

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Abstract

A PTC device comprises two electrode layers and a PTC material layer laminated therebetween. The PTC material layer has a volumetric resistivity less than 0.2 &OHgr;-cm, and comprises a crystalline polymer, conductive ceramic fillers and crystalline low molecular weight organic compound. The crystalline polymer comprises thermoplastic polymer, thermosetting polymer or combination thereof. The conductive ceramic fillers dispersed in the crystalline polymer have volumetric resistivity less than 500 μ&OHgr;-cm, and comprise 40-70% by volume of the PTC material layer. The crystalline low molecular weight organic compound has a molecular weight less than 5000, and comprises 6-30% by volume of the PTC material layer. The hold current at 60° C. divided by a covered area of the PTC device is greater than 0.2 A / mm2, the hold current at 60° C. is 40-95% of the hold current at 25° C., and the trip temperature of the PTC device is less than 95° C.

Description

technical field [0001] The present invention relates to a positive temperature coefficient (positive temperature coefficient; PTC) element, which has a positive temperature coefficient characteristic that the resistance value increases as the temperature rises, and can be applied to a temperature sensor (temperature sensor) and an overcurrent protection (over -current protection). Background technique [0002] Since the resistance of the conductive composite material with PTC characteristics is sensitive to temperature changes, it can be used as a material for current or temperature sensing elements, and has been widely used in overcurrent protection elements or circuit elements. 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 over-current or over-temperature occurs in the circuit or battery, the crystalline polymer in the PTC conductive comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02
CPCH01C7/027H01C17/06586
Inventor 罗国彰张耀德
Owner POLYTRONICS TECH
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