Surge protector with multi-channel protection

A surge protector, multi-channel technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, electrical components, etc., can solve the problem of large surge impact energy, increased manufacturing costs, Installation volume increase and other problems, to achieve the effect of reducing production costs

Pending Publication Date: 2021-04-27
CHENGDU TIEDA ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some defects in this solution. In SPD applications, due to exposure to the open air, the surge impact energy is relatively large. Generally, a piezoresistor chip with a relatively large effective diameter is used to make a series circuit composed of a piezoresistor and a piezoresistor. It is the main channel to absorb the surge pulse, so the varistor and the varistor must meet the requirements of having a large surge withstand capability, and because the performance of the varistor to withstand the surge impact is higher than that of the varistor. The performance of surge impact has led to an increase of at least two times its manufacturing cost, and the same increase in installation volume

Method used

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Experimental program
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Effect test

Embodiment 1

[0047] This embodiment discloses a surge protector with multi-channel protection, which aims to improve the problem of high cost of SPD equipment formed by serial-parallel connection of multiple devices in the prior art. By optimizing the circuit connection mode, it can be used in When selecting materials, select materials with lower specifications and ensure that they have relatively stable breaking capacity.

[0048] Specifically, the surge protector is connected to an external circuit, has two terminals, and a parallel main channel and a secondary channel are provided between the two terminals. The main channel serves as the main channel for absorbing surge pulses. A first piezoresistor 1 with better surge resistance performance is provided, so that a large part of the surge energy can be discharged through this circuit. The secondary channel is a series branch composed of the second piezoresistor 2 and the third piezoresistor 3, which serves as a secondary channel for abso...

Embodiment 2

[0057] This embodiment also discloses a surge protector for multi-channel protection, such as figure 1 As shown, there are also two terminals connected to the external circuit, and a main channel and a secondary channel are arranged in parallel between the two terminals. The surge through the two terminals flows through the main channel and the secondary channel at the same time, and the main channel The channel is provided with a first varistor 1, and the auxiliary channel is provided with a second varistor 2 and a third varistor 3 connected in series, and the third varistor 3 has high surge impact resistance The surge impact resistance performance of the second varistor 2 is used.

[0058] A thermal protection structure connected in parallel with the third piezoresistor 3 is also provided on the auxiliary channel, and a thermal tripping structure is provided at any end. The positive temperature coefficient thermistor 5 and the thermal The trip structure is thermally coupled...

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Abstract

The invention belongs to the field of lightning protection equipment, and discloses a surge protector with multi-channel protection. The surge protector is provided with two ends connected with an external circuit and is provided with a main channel and an auxiliary channel which are connected between the two ends in parallel, surge passing through the two ends flows through the main channel and the auxiliary channel at the same time,a first varistor is arranged on the main channel, a second varistor and a third varistor which are connected in series are arranged on the auxiliary channel, the surge resistance of the first varistor is higher than that of the second varistor and that of the third varistor , and the surge impact resistance of the third varistor is higher than that of the second varistor ; and a positive temperature coefficient thermistor arranged in the thermal protection structure is thermally coupled with a thermal tripping structure through the structure. The surge is discharged through the main channel and the auxiliary channel, and the purpose of fixed-point failure is achieved according to different current density distribution, so that the surge discharge resistance of the auxiliary channel is reduced, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of lightning protection equipment, and in particular relates to a surge protector for multi-channel protection. Background technique [0002] SPD is a surge protector, also called a lightning protector, which is an electronic device that provides safety protection for various electronic equipment, instruments, and communication lines. The core component of the SPD is a surge suppression component, the most commonly used is a varistor ceramic chip. Due to the long transmission distance of power transmission and distribution lines and their exposure to the open air, they are more likely to suffer from high-energy surge pulses than indoor electrical equipment. During the design life of the SPD, the varistor ceramic chips are more likely to be damaged beyond the rated specifications The multiple impacts of the high-energy surge caused the deterioration and failure of the varistor. Since the varistor is a short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H7/00
CPCH02H7/00H02H9/02H02H9/026
Inventor 石小龙张治成叶磊詹俊鹄章俊张旭黎科康杰
Owner CHENGDU TIEDA ELECTRONICS CORP
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