Signal lightning protector

A signal lightning protection and signal line technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve the problem of not being able to design lightning protection performance active indicating circuits, lightning protection The performance is not very ideal, and the reliability of lightning protection performance is low, so as to achieve the effect of improving lightning protection effect, simple structure and reliable lightning protection protection.

Inactive Publication Date: 2002-07-17
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The signal lightning protector on the signal transmission line of the existing RS485 / RS422 and other equipment is generally composed of three transient suppression diodes (TVS tubes) arranged between two signal lines, wherein each transient suppression diode (TVS tube) is respectively It is connected between the two signal lines and between the two signal lines and the ground. Its main function is to discharge and clamp, and play a certain role in lightning protection. However, the lightning protection circuit of this structure is due to the transient suppression diode (TVS tube) Due to its own characteristics, its lightning protection performance is not ideal, and it is easily damaged when struck by lightning, and the reliability of lightning protection performance is low. However, this kind of lightning protection circuit has no stable voltage on its signal line, and some lines on the line The voltage is even lower than 1V, so there is no way to design an active indicator circuit for lightning protection performance (such as LED, etc.), so that the performance of the same lightning protection device often declines or even does not have the lightning protection function at all during use, and the lightning protection device is not replaced in time Damage RS485 / RS422 and other equipment when lightning strikes

Method used

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Examples

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Embodiment 1

[0012] As shown in Figures 1 to 2, this embodiment includes a lightning protection device composed of at least one transient suppression diode arranged between the two signal lines and the ground, and the lightning protection device also includes a lightning protection device arranged between the two signal lines A common-mode lightning protection circuit composed of at least one varistor between the two signal lines and the ground, the common-mode lightning protection circuit includes a varistor VR connected between the two signal lines 1 and a varistor VR connected between the two signal lines and ground 2 and VR 3 . Wherein the lightning protection device includes a transient suppression diode TZ connected between the two signal lines 1 And the transient suppression diode TZ connected between the two signal lines and the ground respectively 2 and TZ 3 . In order to further improve its lightning protection effect, the above lightning protection device also includes two ...

Embodiment 2

[0014] As shown in Figures 1 and 3, the difference between this embodiment and Embodiment 1 is that a gas discharge tube is used instead of a piezoresistor to form a common-mode lightning protection circuit, and the common-mode lightning protection circuit includes a Gas discharge tube G 1 And the gas gas electric tube G connected between the two signal lines and the ground 2 and G 3 , where the gas discharge tube G 1 Two ends of which are respectively connected to two signal lines, and the other end is grounded. All the others are almost the same as in Example 1, and will not be described in detail here.

Embodiment 3

[0016] As shown in Figure 1 and Figure 4, the difference between this embodiment and Embodiment 1 is that the combination of piezoresistor and gas discharge tube is used to form a common-mode lightning protection circuit, and the common-mode lightning protection circuit includes The varistor VR between 1 And the gas discharge tube G connected between the two signal lines and the ground 2 and G 3 . All the others are almost the same as in Example 1, and will not be described in detail here.

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Abstract

The signal lightning protection includes lightning protection device formed from at least more than one transient killer diode and placed between two signal lines and ground, and is characterized by that it also includes common-mode lightning protection circuit formed from at least more than one voltage-sensitive resistor and gaseous discharge tube or their combination and placed between two signal lines and between two signal lines and ground, so that said ivnention possesses double protection, and can effectively raise lightning protection performance of the equipment.

Description

technical field [0001] The invention relates to a lightning protector, in particular to a signal lightning protector used on a signal transmission line. Background technique [0002] The signal lightning protector on the signal transmission line of the existing RS485 / RS422 and other equipment is generally composed of three transient suppression diodes (TVS tubes) arranged between two signal lines, wherein each transient suppression diode (TVS tube) is respectively It is connected between the two signal lines and between the two signal lines and the ground. Its main function is to discharge and clamp, and play a certain role in lightning protection. However, the lightning protection circuit of this structure is due to the transient suppression diode (TVS tube) Due to its own characteristics, its lightning protection performance is not ideal, and it is easily damaged when struck by lightning, and the reliability of lightning protection performance is low. However, this kind of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/06
Inventor 马荣杰
Owner EMERSON NETWORK POWER CO LTD
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