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Plug-in overcurrent protection element

A technology for protecting components and overcurrent, applied in electrical components, current-responsive resistors, circuits, etc., can solve problems such as loss of withstand voltage, and achieve good withstand voltage characteristics, high maintenance current, and high maintenance current per unit area. Effect

Active Publication Date: 2017-11-10
POLYTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if metal fillers are used, even when the PTC material can achieve a volume resistance value lower than 0.2Ω-cm, it often loses the characteristics of withstand voltage because the resistance value is too low

Method used

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Embodiment Construction

[0031] In order to make the above and other related technical contents, features and advantages of the present invention more comprehensible, relevant embodiments are specifically cited below and described in detail as follows.

[0032] figure 1 and figure 2 A plug-in type overcurrent protection element of the first embodiment of the present invention is shown. figure 2 for figure 1 right side view of . The plug-in overcurrent protection device 10 of the present invention includes a PTC device 11 , electrode pins 12 and 13 and an insulating coating 14 . The PTC element 11 includes a first conductive layer 15 , a second conductive layer 16 and a PTC material layer 17 stacked between the first and second conductive layers 15 and 16 . Generally speaking, the area of ​​this PTC element 11 (referring to figure 1 ) less than 300mm 2 , or especially less than 200mm 2 or 100mm 2 , even less than 50mm 2 , and the thickness is 0.2-2mm.

[0033] One end of the first electrode...

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PUM

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Abstract

A plug-in type overcurrent protection element includes a PTC element, first and second electrode pins and an insulating coating layer. The PTC element comprises first and second conductive layers and a PTC material layer stacked therebetween with volume resistivity less than 0.18Ω-cm. The PTC material layer comprises a crystalline polymer and conductive ceramic filler uniformly dispersed therein, the volume resistivity of the conductive ceramic filler is less than 500 μΩ-cm, and the volume percentage of the PTC material layer is between 35-65%. One end of the first electrode pin is connected to the first conductive layer, and one end of the second electrode pin is connected to the second conductive layer. The insulating covering layer covers the PTC element and the first and second electrode pins are connected to one end of the PTC element. The maintenance current of the plug-in overcurrent protection element at 25°C divided by the area of ​​the PTC element is between 0.027 and 0.3A / mm2. The cross-sectional area of ​​each of the first and second electrode pins is at least 0.16mm2.

Description

technical field [0001] The present invention relates to an overcurrent protection element, in particular to a radial-leaded type overcurrent protection element. 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 or temperature sensing elements, and has been widely used in overcurrent protection elements. or circuit components. 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 a circuit or battery, its resistance value will instantly increase to a high resistance state, that is, a trip phenomenon occurs, thereby reducing the current flow rate. current value. [0003] The PTC conductive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02H01C7/13H01C1/144
CPCH01C1/1406H01C1/028H01C1/144H01C7/027H01C17/0652H01C17/06566
Inventor 朱复华沙益安杨恩典蔡东成
Owner POLYTRONICS TECH