Thermistor type overvoltage/overcurrent protection circuit

A technology of overcurrent and overvoltage protection and thermistor, which is applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, emergency protection circuit device, protection reacting to overcurrent, etc., and can solve thermal breakdown , varistor high temperature, limited and other 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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  • Abstract
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  • 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 a...

Method used

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  • Thermistor type overvoltage/overcurrent protection circuit
  • Thermistor type overvoltage/overcurrent protection circuit

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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 circuit, comprising a zinc oxide varistor, a ceramic PTC thermistor and a protected circuit; after the protected circuit is connected in parallel with the ceramic PTC thermistor, The resistors are connected in series.

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Abstract

A thermistor type overvoltage/overcurrent protection circuit comprises a zinc oxide piezoresistor, a ceramic PTC (Positive Temperature Coefficient) thermistor and a protected circuit, wherein the protected circuit is connected in series with the zinc oxide piezoresistor after being connected in parallel with the ceramic PTC thermistor. The technical proposal has the following advantages that: the reliability of the zinc oxide piezoresistor is improved and voltage-sensitive effectiveness loss due to long-term overvoltage is avoided; the protection speed of the ceramic PTC thermistor is increased; and the influence of the ambient temperature on the protection speed of the ceramic PTC thermistor is reduced.

Description

technical field [0001] The technical solution belongs to the technical field of electronic circuits, specifically a thermistor type overcurrent and overvoltage protection circuit. 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 temperatur...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H3/08
Inventor 漆光智王峰
Owner 溧阳杰敏电子有限公司
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