Resettable fuse type overvoltage and overcurrent protection circuit

A self-recovery fuse, overvoltage and overcurrent protection technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve thermal breakdown, varistor temperature High, limited and other problems, to solve the effect of slow protection or even no protection

Inactive Publication Date: 2012-05-02
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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  • Resettable fuse type overvoltage and overcurrent protection circuit
  • Resettable fuse type overvoltage and overcurrent protection circuit

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing and specific embodiment the technical scheme is further described as follows:

[0016] A resettable fuse type overvoltage and overcurrent protection circuit, comprising a varistor, a ceramic PTC thermistor, a resettable fuse and a protected circuit; the protected circuit is connected in series with the varistor and the ceramic PTC thermistor After the resistors formed by the connection are connected in parallel, they are connected in series with the resettable fuse; the piezoresistor and the resettable fuse have a common connection end.

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PUM

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Abstract

The invention discloses a resettable fuse type overvoltage and overcurrent protection circuit, comprising a piezoresistor, a PTC (Positive Temperature Coefficient) ceramic thermistor, a resettable fuse and a protected circuit, wherein the protected circuit is connected with a resistor, formed by connecting the piezoresistor and the PTC ceramic thermistor in series, in parallel and then is connected with the resettable fuse in series; and the piezoresistor and the resettable fuse comprise a common connecting end. The technical scheme provided by the invention has the advantages of increasing the reliability of a zinc oxide piezoresistor so as to prevent a voltage-sensitive failure due to long-term overvoltage, solving the problem of the voltage-sensitive failure of a conventional overvoltage and overcurrent protection device due to over-low protection speed of the resettable fuse, and overcoming the defects that the resettable fuse is slow in protection and unavailable for protection in a low-temperature environment.

Description

technical field [0001] The technical proposal belongs to the technical field of electronic circuits, in particular to a self-restoring fuse type overvoltage and overcurrent 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 i...

Claims

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Application Information

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