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PTC (Positive Temperature Coefficient) ceramic thermistor

A thermistor and ceramic technology, which is applied to resistors with positive temperature coefficients, etc., can solve the problems of less than 20% production pass rate, difficult to meet the requirements of resistance value and withstand voltage of resistors, low efficiency, etc., and achieve reliability. High, safe to use, low power effect

Inactive Publication Date: 2012-02-15
DONGGUAN YUCHI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the existing barium carbonate-based PTC thermistor material is difficult to meet the requirements for the resistance and withstand voltage of the resistor, the production pass rate is less than 20%, and the efficiency is too low

Method used

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Experimental program
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Embodiment Construction

[0016] In this embodiment, the PTC ceramic thermistor is based on barium carbonate with a purity of 99.5%-99.99% and a particle size of 0.1-2 microns, and the weight percentage of the material is:

[0017] Barium Carbonate Electronic Grade 57.53%

[0018] Strontium Carbonate Electronic Grade 11.83%

[0019] Yttrium oxide Electronic grade 0.4321%

[0020] Silicon oxide Electronic grade 0.4013%

[0021] Titanium Oxide Electronic Grade 30.41%

[0022] Manganese Oxide Electronic Grade 0.417%.

[0023] Barium carbonate, as the main material, is the basis for the PTC effect. With the increase of its purity and particle size, the resistance value of the material decreases, and the voltage gradient increases; yttrium oxide can significantly improve the semiconductivity of the material. Larger, its resistance will rise; silicon oxide has the effect of increasing the withstand voltage of ceramic pieces and adsorbing harmful impurities on the interface. With the increase of doping am...

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Abstract

The invention relates to a PTC ceramic thermistor, which is produced with barium carbonate as base material, the purity of the barium carbonate is 99.5 to 99.99 percent, the granularity of the barium carbonate is 0.1 to 2 microns, and the percentages of materials by weight are as follows: 57.53 percent of electron-level barium carbonate; 11.83 percent of electron-level strontium carbonate; 0.4321 percent of electron-level yttrium oxide; 0.4013 percent of electron-level silicon oxide; 30.41 percent of electron-level titanium oxide; and 0.417 percent of electron-level manganese oxide. The PTC ceramic thermistor has the characteristics of high voltage withstanding, low aftercurrent, low power, high reliability, long service life and the like, and is safe to use.

Description

[0001] technical field [0002] The invention relates to a PTC ceramic thermistor. [0003] Background technique [0004] In order to eliminate the influence of stray magnetic fields such as color tube shadow mask, anti-riot ring residual magnetism and geomagnetism on color pictures, PTC thermistors for automatic degaussing have become one of the important components of color TV sets and color monitors. PTC thermistor degaussing principle: at the moment when the switch is closed, since the initial resistance of the thermistor is very small, the initial current is very large. As the temperature of the thermistor rises, the resistance value gradually increases, reducing the loop current. Therefore, a periodically attenuating alternating electric field is generated in the degaussing coil, so the hysteresis loop must also decrease periodically, so as to achieve the purpose of degaussing. However, the existing barium carbonate-based PTC thermistor material is difficult to meet ...

Claims

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Application Information

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IPC IPC(8): H01C7/02
Inventor 张习莲
Owner DONGGUAN YUCHI ELECTRONICS
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