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Lightning protection circuit

A lightning protection circuit and lightning protection technology, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of short circuit of the protected equipment and poor lightning protection effect, and achieve the effect of good lightning protection effect

Active Publication Date: 2014-12-17
SHENZHEN YZ TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a lightning protection circuit, aiming at solving the problem that the surge protector cannot completely short-circuit the protected equipment in the lightning protection circuit provided by the prior art, so that part of the lightning strike current flows through the protected equipment. The problem of poor lightning protection effect

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Embodiment 1

[0021] Embodiment 1 of the present invention proposes a lightning protection circuit, such as figure 1 As shown, it includes a lightning absorbing and isolation circuit 11 whose input end is connected to an external power supply / signal source, and whose output end is connected to the protected device, which is used to absorb part of the lightning current in the output current of the external power supply / signal source, and protect the external power supply / signal The output current of the source is frequency-selectively filtered, and then the power frequency current or carrier signal is output to the protected equipment.

[0022] In one case, such as figure 2 As shown, the lightning absorption and isolation circuit 11 includes: a lightning absorption circuit 111, the input end of the lightning absorption circuit 111 is used as the input end of the lightning absorption and isolation circuit 11, and is used to absorb part of the lightning current in the output current of the ex...

Embodiment 2

[0035] Embodiment 2 of the present invention proposes a lightning protection circuit, such as Figure 6 shown. Different from that shown in Embodiment 1, in Embodiment 2, the lightning protection circuit further includes: a first surge protection circuit 12, and the first surge protection circuit 12 is arranged between the external power supply / signal source and the lightning absorption and isolation circuit 11 , and the input end of the first surge protection circuit 12 is connected to the power supply line of the protected equipment to provide a discharge path for part of the lightning current in the output current of the external power supply / signal source.

[0036] Furthermore, when the external power supply / signal source is a single-phase power supply, such as Figure 7 As shown, the first surge protection circuit 12 may include: a piezoresistor RV1 and a discharge tube G1. Wherein, both ends of the piezoresistor RV1 are connected in parallel between the live line and t...

Embodiment 3

[0040] Embodiment 3 of the present invention proposes a lightning protection circuit, such as Figure 8 shown. Different from that shown in Embodiment 2, in Embodiment 3, the lightning protection circuit further includes: a second surge protection circuit 13, and the second surge protection circuit 13 is arranged between the lightning absorption and isolation circuit 11 and the protected equipment, Moreover, the input terminal of the second surge protection circuit 13 is connected to the power supply line of the protected equipment, and is used to provide a discharge path for the residual lightning current in the current output by the lightning absorption and isolation circuit 11 .

[0041] Furthermore, when the external power supply / signal source is a single-phase power supply, such as Figure 9 As shown, the second surge protection circuit 13 may include: a piezoresistor RV2 and a discharge tube G2. Wherein, both ends of the varistor RV2 are connected in parallel between t...

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Abstract

The invention belongs to the technical field of lightning protection, and provides a lightning protection circuit. The lightning protection circuit comprises a thunder and lightning absorption and isolation circuit connected in series to a power supply line of a device to be protected; the thunder and lightning absorption and isolation circuit comprises a thunder and lightning absorption circuit for absorbing lightning current and a thunder and lightning isolation circuit for performing frequency-selecting and filtering to the current passing therethrough, so that a power frequency signal or a carrier signal passes through to prevent transmission of lightning current, thus playing a role in lightning protection. Compared with the prior art, the lightning protection circuit distributes a shunt proportion of the lightning current without relying on a resistance value of a grounding grid and characteristic impedance of the device to be protected, thus being good in lightning protection effect. In addition, a first surge protection circuit and a second surge protection circuit can be added to further strengthen the lightning protection effect and the requirement of the resistance value of the grounding grid can be greatly reduced, namely the grounding grid with high resistance value can be used, and thereby construction cost of the grounding grid is greatly reduced, and construction period is shortened.

Description

technical field [0001] The invention belongs to the technical field of lightning protection, in particular to a lightning protection circuit. Background technique [0002] Lightning disaster is one of the ten most serious natural disasters announced internationally. Every year, lightning disasters occur frequently and involve a wide range of areas, posing a serious threat to the lives and property of the general public. Especially in today's rapid development of microelectronics technology, lightning discharge not only damages buildings and equipment at the lightning strike point, but also rapidly spreads in all directions in the form of electromagnetic wave radiation and line propagation, which can make many nearby electronic equipment or power transmission Lines are destroyed at the same time, therefore, reducing lightning disasters is the primary goal of modern lightning protection technology. [0003] For this reason, the prior art provides a lightning protection circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/06
Inventor 牛会甫张庭炎
Owner SHENZHEN YZ TECH
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