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Surface labeling type polymer PTC senistor and manufacturing method thereof

A thermistor, surface mount technology, used in current-responsive resistors, resistors with positive temperature coefficients, etc. The effect of weather resistance

Active Publication Date: 2008-09-24
上海神沃电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface-mounted polymer PTC thermistors commonly used at present, because the polymer PTC materials on the side, especially the polymer PTC materials containing metal fillers, are directly exposed to the air, they are easily affected by oxygen and water vapor in the external environment. Intrusion, resulting in poor weather resistance of components
There are also surface mount polymer PTC thermistors that seal the polymer PTC chip inside the product, but the packaging process is complicated and the cost is high

Method used

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  • Surface labeling type polymer PTC senistor and manufacturing method thereof
  • Surface labeling type polymer PTC senistor and manufacturing method thereof
  • Surface labeling type polymer PTC senistor and manufacturing method thereof

Examples

Experimental program
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Effect test

specific Embodiment 1

[0027] Press the polymer PTC material into a sheet with a thickness of 0.45mm, and then use a flat vulcanizer to coat copper foil with a thickness of 0.035mm on both sides, and hot press to form a composite sheet with a total thickness of 0.52mm, that is, the polymer PTC chip 3. After electron accelerator radiation cross-linking, use a punch to punch into 3.0*3.8mm rectangular pieces, wash and dry them for later use.

[0028] Utilize the reflow soldering process to weld the lead-out electrodes on the upper and lower surfaces of the polymer PTC chip 3 ( image 3 shown). Then apply epoxy resin ( figure 1 shown), heating and curing. That is, a surface mount type polymer PTC thermistor is obtained.

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Abstract

The invention discloses a surface bonding typed polymeric PTC thermo-sensitive resistor, and a fabrication method of the thermo-sensitive resistor. The thermo-sensitive resistor comprises a first extraction electrode, a second extraction electrode and a polymeric PTC chip; the lower surface of the first extraction electrode is connected with the upper surface of the polymeric PTC chip; the upper surface of the first extraction electrode is a first extraction terminal; the second extraction electrode is connected with the lower surface of the polymeric PTC chip; the thermo-sensitive resistor is characterized in that an encapsulating layer is also included; the encapsulating layer is covered on other surfaces of the polymeric PTC chip which are not contacted with the extraction electrode. The polymeric PTC chip is completely sealed inside an element by the thermo-sensitive resistor, thus achieving the aim that the polymeric PTC material is completely isolated from the air, and improving the weatherability of the surface bonding typed polymeric PTC thermo-sensitive resistor.

Description

technical field [0001] The invention relates to an electronic component for overcurrent protection, in particular to a surface mount polymer PTC thermistor with polymer material as the main raw material. Background technique [0002] Functional polymer materials are currently a hot spot in material science research, and polymer composite conductive materials with PTC characteristics are among the best. So far, the academic and industrial circles are actively researching and developing it. The so-called polymer PTC composite conductive material is a polymer composite conductive material with positive temperature coefficient resistance characteristics. That is to say, within a certain temperature range, the resistivity of the conductive material itself will increase with the increase of temperature. [0003] The polymer PTC thermistor made of polymer PTC material can be used as an overcurrent protection device for the circuit. It is used in the circuit in series. When the ci...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01C7/13
Inventor 权秀衍张永谢
Owner 上海神沃电子有限公司
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