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Thermistor type over-current and over-voltage protection device

A technology of overcurrent and overvoltage protection and thermistor, applied in emergency protection circuit devices, electrical components, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve thermal breakdown, varistor temperature High and limited problems, to avoid pressure-sensitive failure and improve reliability

Inactive Publication Date: 2012-04-04
溧阳杰敏电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zinc oxide varistor absorbs energy when it is turned on, and its temperature rises rapidly. Therefore, the energy that the varistor can absorb when it is turned on is limited. If the energy is too large, the temperature of the varistor will be too high and thermal breakdown will fail.

Method used

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  • Thermistor type over-current and over-voltage protection device
  • Thermistor type over-current and over-voltage protection device

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing and specific embodiment the technical scheme is further described as follows:

[0015] A thermistor type overcurrent and overvoltage protection device, comprising a zinc oxide varistor, a ceramic PTC thermistor and an encapsulation coating; one end of the zinc oxide varistor and one end of the ceramic PTC thermistor pass through a conductive layer Connection; the connecting end of the zinc oxide varistor and the ceramic PTC thermistor is connected to the lead wire, the other end of the zinc oxide varistor is connected to the lead wire, and the other end of the ceramic PTC thermistor is connected to the lead wire; Except for zinc varistors and ceramic PTC thermistors, only the leads are exposed.

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PUM

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Abstract

The invention discloses a thermistor type over-current and over-voltage protection device which comprises a zinc oxide piezoresistor, a ceramic PTC (Positive Temperature Coefficient) thermistor and a package coating; wherein one end of the zinc oxide piezoresistor is connected with one end of the ceramic PTC thermistor through a conductive layer; the connecting ends of the zinc oxide piezoresistor and the ceramic PTC thermistor are connected with a lead, and both the other end of the zinc oxide piezoresistor and the other end of the ceramic PTC thermistor are connected with the lead; and the package coating is coated outside the zinc oxide piezoresistor and the ceramic PTC thermistor so as to ensure that only the lead is exposed. The technical scheme has the effects of improving the reliability of the zinc oxide piezoresistor, avoiding the pressure-sensitive failure of the zinc oxide piezoresistor caused by long-time over-voltage; increasing the protecting speed of the ceramic PTC thermistor and reducing the influence of ambient temperature on the protecting speed of the ceramic PTC thermistor.

Description

technical field [0001] The technical proposal belongs to the technical field of electrical devices, in particular to a thermistor type overcurrent and overvoltage protection device. Background technique [0002] Zinc oxide varistors have nonlinear volt-ampere characteristics, and are generally used in electronic circuits as anti-overvoltage and anti-lightning protection devices. When the voltage is lower than the working voltage value of the varistor, the resistance of the varistor is extremely high, almost open circuit, so it will not affect the normal operation of the device or electrical equipment. When the voltage is momentarily higher than a certain value, the resistance of the varistor drops rapidly, conducts a large current, and clamps the voltage within the voltage range that the protected device or electrical equipment can withstand to protect the protected device or electrical equipment. The zinc oxide varistor absorbs energy when it is turned on, and its temperat...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H9/04
Inventor 漆光智王峰
Owner 溧阳杰敏电子有限公司
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