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Low-resistance high-reproducibility PTC over-current protection element

A technology for protecting components and overcurrents, applied in electrical components, resistors and circuits that respond to currents, etc., can solve the problems of abnormal rise and resistance of polymer PTC products, affecting performance, and PTC products getting wet, etc., to improve environmental reliability and performance. Effect

Pending Publication Date: 2021-11-19
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current low-resistance products generally use metal powder and metal carbide as conductive fillers. Metal powder and metal carbide are easily oxidized by air or absorb moisture when exposed to the air for a long time, resulting in abnormal rise and resistance of polymer PTC products, affecting intelligence. Equipment
[0004] In the existing disclosed technology, the material side of the surface mount component is exposed in the air, causing the PTC product to be damp after the component is placed in the air or used for a period of time, and the resistance value increases, which seriously affects its performance.

Method used

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  • Low-resistance high-reproducibility PTC over-current protection element
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  • Low-resistance high-reproducibility PTC over-current protection element

Examples

Experimental program
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Effect test

preparation example Construction

[0048] Preparation of polymer PTC composite sheet:

[0049] The base layer of conductive polymer composite material with positive temperature coefficient of resistance effect is composed of high-density polyethylene and dispersed in the polymer. The volume resistivity is 0.1-100mΩ.cm, and the particle size is:

[0050] 0.1 μm ~ 50 μm conductive filler metal tungsten carbide, the two are mixed in a high-speed mixer in proportion for 30 minutes, and the mixture components are granulated in a twin-screw granulator at a temperature of 180 ° C, cooled, crushed, and then passed through a single After extrusion and calendering by the screw extruder, electrode foils are attached to the upper and lower surfaces of the polymer sheet, and pressed into an area of ​​400cm 2 , 0.3mm thick polymer composite base layer 5, after heat treatment in a vacuum oven at 120°C for 0.5 hours, use gamma rays (Co 60 ) irradiation with a dose of 16Mrad; after that, a polymer PTC composite sheet was obtai...

Embodiment 1

[0052] A low-resistance polymer PTC overcurrent protection component that can effectively increase the environmental reliability of the product. It is made of a surface-mounted polymer PTC overcurrent protection component using printed circuit board technology, including polymer PTC composite sheets and terminal electrodes. , conductive electrodes, insulating layers and conductive vias, where,

[0053] An encapsulation layer or plating layer is added on the side of the overcurrent protection element to isolate the polymer PTC composite sheet from the air, so as to improve the environmental reliability of the overcurrent protection element;

[0054] A polymer PTC composite sheet, composed of first and second conductive electrodes 4, 6 and a polymer composite material base layer 5;

[0055]The polymer PTC composite sheet is etched into insulating grooves on the first conductive electrode 4 and the second conductive electrode 6 respectively through PCB etching processing technolo...

Embodiment 2

[0058] A low-resistance polymer PTC overcurrent protection element that can effectively increase the environmental reliability of the product is made of a surface-mounted polymer PTC overcurrent protection element using a printed circuit board process, which is similar to Example 1, wherein,

[0059] An encapsulation layer or coating is added to the side and front of the overcurrent protection element to isolate the polymer PTC composite sheet from the air, so as to improve the environmental reliability of the overcurrent protection element;

[0060] A polymer PTC composite sheet, composed of first and second conductive electrodes 4, 6 and a polymer composite material base layer 5;

[0061] The polymer PTC composite sheet is processed by PCB etching technology, so that the first conductive electrode 4 and the second conductive electrode 6 are respectively etched into insulating grooves, and then the upper insulating layer 3 is superimposed on the first conductive electrode 4, a...

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Abstract

The invention relates to a low-resistance high-reproducibility PTC over-current protection element, which has a function of effectively improving the environmental reliability of a product and is a low-resistance surface-mounted polymer PTC over-current protection element mainly made of a polymer PTC composite sheet and having excellent environmental stability. The side surface of theprotection element, or the side surface and the front surface of the protection element is provided with a coating layer or a plating layer, so that the conductive composite material base layer is isolated from the external environment. The low-resistance high-reproducibility PTC over-current protection element has the following characteristics that 1, any combination surface of the four side surfaces of the element is coated with a coating layer or a plating layer, and one front surface can be coated with or not coated with the coating layer, so that the polymer PTC composite sheet of the element is isolated from the environment, and the resistance reproducibility of the product is improved; 2, the conductive holes playing a role in electrical connection are positioned on two sides of the element, so that the element has good welding performance; and 3, the structure of the existing product is not changed, and the existing assembly mode can be completely adopted.

Description

technical field [0001] The invention relates to an electronic component with a conductive polymer composite material as the main material, in particular to a low-resistance and high-reproducibility PTC overcurrent protection component. Background technique [0002] PTC materials with positive temperature coefficient characteristics can maintain a low resistance value at normal temperatures, and have the characteristics of being sensitive to temperature changes, that is, when an overcurrent or overtemperature occurs in the circuit, its resistance will instantly increase to a high value. The resistance value keeps the circuit in an open circuit state to achieve the purpose of protecting circuit components. Therefore, the polymer-based conductive composite material can be connected to the circuit as a material for the current sensing element. Overcurrent protection components made of such materials have been widely used in electronic circuits. [0003] In recent years, with t...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01C7/13
CPCH01C7/021H01C7/02H01C7/13
Inventor 高道华夏坤张锐黄贺军方勇吴国臣张伟
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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