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Composite varistor overvoltage protection circuit

An overvoltage protection circuit, varistor technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve problems such as reducing the protection effect of varistors , to achieve the effect of high power frequency withstand voltage and reduce failure rate

Active Publication Date: 2016-08-10
HUNAN JINYANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to propose a compound varistor overvoltage protection circuit, which can solve the problem that the varistor itself is easy to become a Fault point, when the varistor voltage is selected too high, the high residual voltage drop will reduce the protection effect of the varistor on the protected object

Method used

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  • Composite varistor overvoltage protection circuit
  • Composite varistor overvoltage protection circuit
  • Composite varistor overvoltage protection circuit

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Embodiment Construction

[0020] In the following, the present invention will be further described in conjunction with the drawings and specific embodiments.

[0021] Such as Figure 4 and Figure 5 As shown, a composite piezoresistor overvoltage protection circuit includes a positive temperature coefficient (PTC) thermistor chip 5, a piezoresistor chip 4 and a gas discharge tube 6; the positive temperature coefficient thermistor chip 5 The electrode on one side and the electrode on one side of the varistor chip 4 are connected together by solder to form a common terminal, which is drawn out through the second pin 2; the electrode on the other side of the positive temperature coefficient thermistor chip 5 is drawn out through the first pin 1; The electrode on the other side of the sensitive resistance chip 4 is drawn out through the third pin 3; the positive temperature coefficient thermistor chip 5 and the piezoresistor chip 4 form a composite PTC thermistor; one end of the gas discharge tube 6 is co...

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PUM

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Abstract

The invention relates to an overvoltage production circuit of a composite type piezoresistor. The overvoltage production circuit comprises a composite type PTC (Positive Temperature Coefficient) thermistor comprising a positive temperature coefficient thermistor chip and a piezoresistor chip; one end of a gas discharge tube is connected with a first pin, and the other end of the gas discharge tube is connected with a second pin; and the composite type PTC thermistor is connected with the input end of a to-be-protected object in parallel through the first pin and a third pin. The overvoltage production circuit disclosed by the invention has response speed of the gas discharge tube, circulating capacity of the piezoresistor, residual voltage 50 VDC higher than voltage-sensitive residual voltage drop and higher working frequency withstand voltage and is used for protecting the to-be-protected object better with lower residual voltage drop.

Description

technical field [0001] The present invention relates to overvoltage protection circuits. Background technique [0002] The current overvoltage protection circuit consists of the following three types. [0003] (1) if figure 1 As shown, the varistor Rm is a voltage-limiting protection device, which is widely used in various electronic equipment due to its excellent voltage non-linear characteristics. If the varistor Rm fails, it will catch fire or even explode. [0004] In order to solve this phenomenon, people have to gradually increase the varistor value of the varistor Rm, or use a fuse F with a larger current, which will cause the excessive residual voltage drop after the varistor voltage is increased to affect the protected object. If the protection function is lost, or the fuse does not blow when the protected object fails, the meaning of assembly will be lost. [0005] (2) if figure 2 As shown, the gas discharge tube GDT is a switch-type protective device. When t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H9/06
Inventor 沈朝阳
Owner HUNAN JINYANG ELECTRONICS CO LTD
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