Anti-static and lightning-prevention dual protection circuit

A double protection and anti-static technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve problems affecting EMC performance of electronic equipment, damage to electronic equipment, etc. To achieve the effect of flexible use, avoiding injury or damage, and simple structure

Inactive Publication Date: 2012-09-19
JIANGSU LEMOTE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the electronic equipment is subjected to lightning strikes and ESD, transient overvoltage or overcurrent will be generated in its internal circuit, which will affect the EMC performance of the electronic equipment in the slightest, and cause irreversible damage to the electronic equipment in severe cases.

Method used

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  • Anti-static and lightning-prevention dual protection circuit
  • Anti-static and lightning-prevention dual protection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] see figure 1 , an anti-static and lightning protection double protection circuit, including a differential signal interface 1 at both ends and a first differential signal line 2 and a second differential signal line 3 connected to the differential signal interface 1, the first differential signal line 2 and the second differential signal line At least one gas discharge tube 4 connected in series with the differential signal interface 1 is arranged between the signal lines 3, and the gas discharge tube 4 is one. The gas discharge tube 4 has three pins, one of which is used for grounding, and the second pin is used for grounding. The first differential signal line 2 and the second differential signal line 3 are both provided with a resistor 5 , and a transient voltage suppressor 6 connected in parallel with the differential signal interface 1 is provided between the first differential signal line 2 and the second differential signal line 3 .

[0015] First of all, let the...

Embodiment 2

[0017] see figure 2 , an anti-static lightning protection double protection circuit, including a differential signal interface at both ends and a first differential signal line 2 and a second differential signal line 3 connected to the differential signal interface 1, the first differential signal line 2 and the second differential signal line At least one gas discharge tube 4 connected in series with the differential signal interface 1 is arranged between the lines 3, the first differential signal line 2 and the second differential signal line 3 are provided with a resistor 5, the first differential signal line 2 and the second differential signal line A transient voltage suppressor 6 connected in parallel with the differential signal interface 1 is provided between the differential signal lines 3 .

Embodiment 3

[0018] Embodiment 3: The difference from other embodiments is that the gas discharge tube 4 is a ceramic gas discharge tube, which can prolong the service life of the gas discharge tube.

[0019] The so-called gas discharge tube 4 in the present invention includes a diode and a triode, and the voltage range is from 75V to 3500V. It is used for the first or first two stages in the multi-level protection circuit and is a common discharge tube on the market.

[0020] The so-called transient voltage suppressor 6 in the present invention is a high-efficiency protection device in the form of a diode. When the transient voltage suppressor 6 diode is subjected to an instantaneous high-energy impact, it can turn it off at a speed of 10 seconds to 20 seconds. The high impedance between the two poles becomes low impedance, absorbing surge power of several thousand watts, making the voltage box between the two poles at a predetermined value, effectively protecting the precision components ...

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PUM

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Abstract

The invention discloses an anti-static and lightning-prevention dual protection circuit, which comprises differential signal interfaces at two ends, a first differential signal wire and a second differential signal wire, wherein the first differential signal wire and the second differential signal wire are used for connecting the differential signal interfaces, at least one gas discharge tube in mutual serial connection is arranged between the first differential signal wire and the second differential signal wire and is connected with the differential signal interfaces in parallel, the first differential signal wire and the second differential signal wire are both provided with resistors, and a transient voltage suppressor in parallel connection with the differential signal interfaces is arranged between the first differential signal wire and the second differential signal wire. The anti-static and lightning-prevention dual protection circuit disclosed by the invention can achieve the dual protection effect, the gas discharge tube is used as first-stage protection, the transient voltage suppressor is used as second-stage protection, so that a protection coefficient is increased, and the damages or destructions caused by static or lightning are avoided effectively.

Description

technical field [0001] The invention relates to the field of antistatic or lightning protection, in particular to an antistatic and lightning double protection circuit. Background technique [0002] With the development of science and technology, the increasingly widely used microelectronics technology and the gradual realization of electrification have formed a complex electromagnetic environment. Therefore, electromagnetic compatibility (EMC-Electro Magnetic Compatibility) plays a very important role in electronic equipment. It refers to the coexistence state of each component of electronic equipment in a common electromagnetic environment, that is, it requires various equipment in the same electromagnetic environment. They can work normally without interfering with each other and reach the state of electromagnetic compatibility. [0003] Among the many factors affecting EMC performance, ESD (Electro-Static discharge, electrostatic discharge) is a very common natural phen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/06H02H9/04
Inventor 吴少刚张福新李军刘瑞斌张斌徐锋崔太有
Owner JIANGSU LEMOTE TECH CORP
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