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Signal lighting protection circuit

A technology for signal lightning protection and lightning protection circuits, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of easy damage, failure to achieve common mode lightning protection, and low lightning protection performance, and achieve improved protection Lightning performance, suppression of radiation emission, and improvement of common mode lightning protection effect

Active Publication Date: 2009-08-19
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the TVS diode itself, the lightning protection performance of the circuit is very low, and it is easy to be damaged when struck by lightning.
In addition, because the transient suppression diode of the circuit is connected to the signal ground, the circuit cannot achieve the purpose of common-mode lightning protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one, as figure 2 The signal lightning protection circuit shown includes a third transient suppression diode TVS3 connected between the first signal line A and the second signal line B, and a third transient suppression diode TVS3 connected between the first signal line A and the signal ground GND. The second transient suppression diode TVS2 and the first transient suppression diode TVS1 are connected between the second signal line B and the signal ground GND, and the first discharge tube G1 is connected between the signal ground GND and the protection ground PGND. When a lightning strike occurs, the lightning strike current is discharged to the protection ground PGND through two channels of the first transient suppression diode TVS1, the first discharge tube G1, the second transient suppression diode TVS2, and the first discharge tube G1, so as to achieve common mode protection. Ray's purpose.

[0020] The circuit also includes a first capacitor C1 connecte...

Embodiment 2

[0023] Embodiment two, such as image 3 The signal lightning protection circuit shown includes a third transient suppression diode TVS3 connected across the first signal line A and the second signal line B, connected between the first signal line A and the signal ground GND The second transient suppression diode TVS2 and the first transient suppression diode TVS1 connected between the second signal line B and the signal ground GND also include the first discharge tube G1 and the second discharge tube G2; the first discharge tube G1 It is connected between the first signal line A and the protection ground PGND, and the second discharge tube G2 is connected between the second signal line B and the protection ground PGND. A third capacitor C3 is also included in the circuit, and the third capacitor C3 is connected between the signal ground GND and the protection ground PGND. The third capacitor (C3) is a safety capacitor.

[0024] The discharge tube can discharge the lightning ...

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PUM

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Abstract

The invention discloses a signal lightning protection circuit, and relates to a signal lightning protection circuit used on a signal transmission line. In the circuit, the third transient suppression diode connected between the first signal line and the second signal line, the second transient suppression diode connected between the first signal line and the signal ground, and the second transient suppression diode connected between the second The first transient suppression diode between the signal line and the signal ground also includes a lightning protection device, and the lightning protection device is a first discharge tube connected between the signal ground and the protection ground. The circuit further includes a first capacitor connected between the first signal line and the protection ground, and a second capacitor connected between the second signal line and the protection ground. The circuit further includes a third capacitor connected in parallel to the first discharge tube. The first capacitor, the second capacitor and the third capacitor are safety capacitors. The invention can achieve the purpose of common-mode lightning protection, can improve the board-level lightning protection performance, and has the function of suppressing radiation emission at the same time.

Description

[technical field] [0001] The invention relates to a lightning protection circuit, in particular to a signal lightning protection circuit used on a signal transmission line. [Background technique] [0002] exist figure 1 Among them, the lightning protection circuit of the existing RS485 / RS422 signal line is generally composed of TVS1 and TVS2 respectively arranged between the two signal lines and the signal ground and a TVS diode arranged between the two signal lines Composed of TVS3, the function of the transient suppression diode is electrostatic discharge, and it also has a very weak lightning protection effect. Due to the characteristics of the TVS diode itself, the lightning protection performance of the circuit is very low, and it is easy to be damaged when struck by lightning. In addition, because the transient suppression diode of the circuit is connected to the signal ground, the circuit cannot achieve the purpose of common-mode lightning protection. [Content of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H9/06
Inventor 杜亚东
Owner VERTIV CORP