CN100530886C - Signal lightning protection circuit - Google Patents
Signal lightning protection circuit Download PDFInfo
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- CN100530886C CN100530886C CN 200510006643 CN200510006643A CN100530886C CN 100530886 C CN100530886 C CN 100530886C CN 200510006643 CN200510006643 CN 200510006643 CN 200510006643 A CN200510006643 A CN 200510006643A CN 100530886 C CN100530886 C CN 100530886C
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- lightning protection
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- 230000001629 suppression Effects 0.000 claims abstract description 37
- 230000001052 transient effect Effects 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 abstract description 29
- 230000001681 protective effect Effects 0.000 abstract description 6
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 11
- 230000006378 damage Effects 0.000 description 5
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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. The circuit comprises a third transient suppression diode connected between the first signal line and the second signal line in a bridging mode, a second transient suppression diode connected between the first signal line and a signal ground, a first transient suppression diode connected between the second signal line and the signal ground, and a lightning protection device which is a first discharge tube and is connected between the signal ground and a protective ground. The circuit further includes a first capacitor connected between the first signal line and a protective ground and a second capacitor connected between the second signal line and the protective ground. The circuit further includes a third capacitor coupled in parallel with the first discharge tube. The first capacitor, the second capacitor and the third capacitor are safety capacitors. The invention can achieve the aim of common-mode lightning protection, improve the board-level lightning protection performance and simultaneously has the function of inhibiting radiation emission.
Description
[technical field]
The present invention relates to a kind of lightning protection circuit, relate in particular to a kind of signal lighting protection circuit that is used on the signal transmission line.
[background technology]
In Fig. 1, the lightning protection circuit of existing RS485/RS422 holding wire is generally formed by being arranged at Transient Suppression Diode TVS1, the TVS2 between two holding wires and the signal ground respectively and being arranged on two Transient Suppression Diode TVS3 between the holding wire, the effect of Transient Suppression Diode is a static discharge, and very weak lightning protection effect is also arranged.Because the characteristic of Transient Suppression Diode itself has determined that this circuit lightning protection properties is very low, when thunderbolt, damage easily.In addition because the Transient Suppression Diode of this circuit is received signal ground, so this circuit does not reach common mode lightning protection purpose yet.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of signal lighting protection circuit, can reach common mode lightning protection this purpose.
The present invention realizes by following technical scheme:
A kind of signal lighting protection circuit; comprise the 3rd Transient Suppression Diode TVS3 that is connected across between the first holding wire A, the secondary signal line B; be connected the second Transient Suppression Diode TVS2 between the first holding wire A, the signal ground GND; be connected the first Transient Suppression Diode TVS1 between secondary signal line B, the signal ground GND; also comprise lightning protection component; described lightning protection component one termination protection ground PGND, the other end is coupled on the holding wire
Also comprise first capacitor C 1 between the PGND and second capacitor C 2 between the PGND with being connected the first holding wire A, protection with being connected secondary signal line B, protection,
Wherein, described lightning protection component is first discharge tube.
The present invention further comprises and is connected in the 3rd electric capacity on first discharge tube.
Described first electric capacity, second electric capacity and the 3rd electric capacity are safety electric capacity.
Wherein, described lightning protection component comprises first discharge tube and second discharge tube; Described first discharge tube is connected between first holding wire and the protection ground, and second discharge tube is connected between secondary signal line and the protection ground.
The present invention further comprises the 3rd electric capacity, and described the 3rd electric capacity is connected between signal ground, the protection ground.
Described the 3rd electric capacity is safety electric capacity.
Further improvement of the present invention is, also comprises first resistance and second resistance that are serially connected in respectively on first holding wire, the secondary signal line.
The resistance of described first resistance and second resistance is less than 10 ohm.
Owing to adopted above-mentioned technical scheme, realized common mode lightning protection truly; Utilize the capacitance characteristic of safety electric capacity simultaneously, release thunder-strike current and inhibition thunderbolt voltage effectively improve the common mode lightning protection effect, and Transient Suppression Diode are played a protective role; Be connected in series the resistance of little resistance, played the effect of the Transient Suppression Diode between the guard signal line; The present invention has not only improved plate level lightning protection properties, can also suppress radiated emission simultaneously.
[description of drawings]
Fig. 1 is signal lighting protection circuit figure of the prior art.
Fig. 2 is a kind of signal lighting protection circuit figure of the present invention.
Fig. 3 is another kind of signal lighting protection circuit figure of the present invention.
[embodiment]
Embodiment one, a kind of signal lighting protection circuit as shown in Figure 2; comprise the 3rd Transient Suppression Diode TVS3 that is connected across between the first holding wire A, the secondary signal line B, be connected the second Transient Suppression Diode TVS2 between the first holding wire A, the signal ground GND and be connected the first Transient Suppression Diode TVS1 between secondary signal line B, the signal ground GND, the first discharge tube G1 is connected between signal ground GND and the protection ground PGND.When thunderbolt took place, thunder-strike current was released to by the first Transient Suppression Diode TVS1, the first discharge tube G1 and the second Transient Suppression Diode TVS2, the first discharge tube G1 two passes and is protected ground PGND, thereby reached the purpose of common mode lightning protection.
In circuit, also comprise first capacitor C 1 between the PGND and second capacitor C 2 between the PGND with being connected the first holding wire A, protection with being connected secondary signal line B, protection.Utilize I=C*dV/dT, first capacitor C 1 and second capacitor C 2 thunder-strike current of releasing strengthens the protective capacities of differential mode, common mode thunderbolt, protects the first Transient Suppression Diode TVS1, the second Transient Suppression Diode TVS2, avoids being burnt out because of common mode current is excessive.In addition, first capacitor C 1, second capacitor C 2 suppress the effect of the external radiated emission of circuit in addition.
In circuit, also comprise and be connected in the 3rd capacitor C 3 on the first discharge tube G1.Increase the in parallel of the 3rd capacitor C 3 and the first discharge tube G1, can improve the antistatic capacity of circuit.Because the discharge tube response speed is too slow, before the first discharge tube G1 works, can damage device at the too high electrostatic energy of signal ground plane accumulation, the 3rd capacitor C 3 a part of electrostatic energy of can releasing has been arranged.
Described first capacitor C 1, second capacitor C 2 and the 3rd capacitor C 3 are safety electric capacity.Safety electric capacity all is off state under situation about losing efficacy, and is used to be connected across between dangerous circuit (plane) and the safety circuit (plane).In circuit, the holding wire dangerous voltage that may be coupled under the situation of safety condenser failure, can avoid protection ground PGND to have dangerous voltage with the holding wire short circuit, thereby the protection related personnel avoids the injury of shocking by electricity.Adopt safety electric capacity, can improve the common mode lightning protection effect, the Transient Suppression Diode in simultaneously also can protective circuit also can be protected personal safety.
In embodiment two, a kind of signal lighting protection circuit as shown in Figure 3, comprise the 3rd Transient Suppression Diode TVS3 that is connected across between the first holding wire A, the secondary signal line B, be connected the second Transient Suppression Diode TVS2 between the first holding wire A, the signal ground GND and be connected the first Transient Suppression Diode TVS1 between secondary signal line B, the signal ground GND, also comprise the first discharge tube G1 and the second discharge tube G2; The first discharge tube G1 is connected between the first holding wire A and the protection ground PGND, and the second discharge tube G2 is connected between secondary signal line B and the protection ground PGND.Also comprise the 3rd capacitor C 3 in circuit, described the 3rd capacitor C 3 is connected between signal ground GND, the protection ground PGND.Described the 3rd electric capacity (C3) is safety electric capacity.
The discharge tube thunder-strike current of several KA of can releasing to tens KA.The Transient Suppression Diode reaction time is the nS level, and the reaction time of discharge tube is the uS level.When thunderbolt was arranged, Transient Suppression Diode is action earlier, and thunder-strike current is released protection on the ground through the first Transient Suppression Diode TVS1, the 3rd capacitor C 3 and the second Transient Suppression Diode TVS2, the 3rd capacitor C 3 earlier.Discharge tube action subsequently, thunder-strike current through the first discharge tube G1, the second discharge tube G2 with releasing protection.This shows that this circuit common mode lightning protection capability has obtained further reinforcement.
The effect of the 3rd capacitor C 3 is to form the common mode current path of releasing jointly with the first Transient Suppression Diode TVS1, the second Transient Suppression Diode TVS2.The purpose of using safety electric capacity is to avoid under the situation that the 3rd capacitor C 3 lost efficacy dangerous voltage being connected to protection on the ground, thereby avoids the person to be subjected to the dangerous voltage injury.
In Fig. 2 and Fig. 3, first resistance R 1 and second resistance R 2 on first holding wire that is serially connected in, the secondary signal line B all are the resistance of little resistance, and resistance plays metering function, avoid the 3rd Transient Suppression Diode TVS3 to flow through too big electric current and damage.Resistance has stray inductance L, utilizes the effect of L=dI/dT, and the current-rising-rate of the 3rd Transient Suppression Diode TVS3 is flow through in restriction, protects the 3rd Transient Suppression Diode TVS3.Owing to all have the resistance of characteristic impedance (characteristic impedance as RS485 is about 100 Europe) first resistance R 1, second resistance R 2 to cross the impedance that conference influences holding wire on the holding wire, cause signal distortion on the holding wire, generally better with interior effect in 10 Europe.They have played the effect of protecting the 3rd Transient Suppression Diode TVS3, strengthen differential mode lightning Protection ability.
The too high resistance to sparking of differential mode voltage is avoided in the effect that first capacitor C 1 in Fig. 2, second capacitor C 2 are protected first resistance R 1 and second resistance R 2 in addition.
Claims (10)
1, a kind of signal lighting protection circuit; comprise the 3rd Transient Suppression Diode (TVS3) that is connected across between first holding wire (A), the secondary signal line (B); be connected second Transient Suppression Diode (TVS2) between first holding wire (A), the signal ground; be connected first Transient Suppression Diode (TVS1) between secondary signal line (B), the signal ground; also comprise lightning protection component; described lightning protection component one termination protection ground (PGND); the other end is coupled on the holding wire, it is characterized in that:
Also comprise first electric capacity (C1) between (PGND) and second electric capacity (C2) between (PGND) with being connected first holding wire (A), protection with being connected secondary signal line (B), protection.
2, a kind of signal lighting protection circuit according to claim 1 is characterized in that: described lightning protection component is first discharge tube (G1).
3, a kind of signal lighting protection circuit according to claim 2 is characterized in that: also comprise and be connected in the 3rd electric capacity (C3) on first discharge tube (G1).
4, a kind of signal lighting protection circuit according to claim 1 is characterized in that: described first electric capacity (C1) and second electric capacity (C2) are safety electric capacity.
5, a kind of signal lighting protection circuit according to claim 3 is characterized in that: described the 3rd electric capacity (C3) is safety electric capacity.
6, a kind of signal lighting protection circuit according to claim 1 is characterized in that: described lightning protection component comprises first discharge tube (G1) and second discharge tube (G2); Described first discharge tube (G1) is connected between first holding wire (A) and the protection ground (PGND), and second discharge tube (G2) is connected between secondary signal line (B) and the protection ground (PGND).
7, a kind of signal lighting protection circuit according to claim 6 is characterized in that: also comprise the 3rd electric capacity (C3), described the 3rd electric capacity (C3) is connected between signal ground, the protection ground (PGND).
8, a kind of signal lighting protection circuit according to claim 7 is characterized in that: described the 3rd electric capacity (C3) is safety electric capacity.
9, the lightning protection circuit of a kind of holding wire according to claim 1 is characterized in that: also comprise first resistance (R1) and second resistance (R2) that are serially connected in respectively on first holding wire (A), the secondary signal line (B).
10, the lightning protection circuit of a kind of holding wire according to claim 9 is characterized in that: the resistance of described first resistance (R1) and second resistance (R2) is less than 10 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510006643 CN100530886C (en) | 2005-01-14 | 2005-01-14 | Signal lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510006643 CN100530886C (en) | 2005-01-14 | 2005-01-14 | Signal lightning protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1649228A CN1649228A (en) | 2005-08-03 |
| CN100530886C true CN100530886C (en) | 2009-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510006643 Active CN100530886C (en) | 2005-01-14 | 2005-01-14 | Signal lightning protection circuit |
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| CN (1) | CN100530886C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100508323C (en) * | 2005-12-12 | 2009-07-01 | 深圳市科陆电源技术有限公司 | Signal lightning protection circuit |
| CN101546901B (en) * | 2009-05-07 | 2012-09-26 | 北京玛斯特系统工程有限公司 | Circuit protection device for building automation system |
| CN102195283B (en) * | 2010-03-03 | 2015-02-25 | 华为终端有限公司 | Terminal product and safety protection method thereof |
| CN101872968A (en) * | 2010-03-05 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Protective circuit |
| CN103515942B (en) * | 2012-06-28 | 2017-12-22 | 中兴通讯股份有限公司 | The protection circuit of communication interface |
| CN103248035A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Start-up surge protection circuit |
| CN106253259A (en) * | 2016-10-13 | 2016-12-21 | 广西大学 | A kind of multiple lightning protection device of CAN |
| CN106655135A (en) * | 2016-11-17 | 2017-05-10 | 广西大学 | CAN bus lightning protection device capable of automatically detecting lightning stroke number |
| CN107230973A (en) * | 2017-07-20 | 2017-10-03 | 四川赛尔特科技有限公司 | A kind of single channel 3G HD videos Bidirectional lightning protection device |
| CN107171308A (en) * | 2017-07-20 | 2017-09-15 | 四川赛尔特科技有限公司 | Ultrahigh speed Ethernet monitors surge protection device |
| CN107221923A (en) * | 2017-07-20 | 2017-09-29 | 四川赛尔特科技有限公司 | A kind of coaxial high definition power supply video two-in-one lightning |
| CN115752788A (en) * | 2022-10-20 | 2023-03-07 | 深圳市虎一科技有限公司 | Handheld temperature probe for food cooking |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375022Y (en) * | 1999-05-28 | 2000-04-19 | 阎跃 | Lightning protection device |
| CN1359182A (en) * | 2001-12-31 | 2002-07-17 | 深圳安圣电气有限公司 | Signal lightning protector |
| CN2569411Y (en) * | 2002-08-14 | 2003-08-27 | 李锦添 | Lightning protector |
| CN2588637Y (en) * | 2002-09-06 | 2003-11-26 | 新疆金风科技股份有限公司 | Lightning protector for electric equipment |
-
2005
- 2005-01-14 CN CN 200510006643 patent/CN100530886C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375022Y (en) * | 1999-05-28 | 2000-04-19 | 阎跃 | Lightning protection device |
| CN1359182A (en) * | 2001-12-31 | 2002-07-17 | 深圳安圣电气有限公司 | Signal lightning protector |
| CN2569411Y (en) * | 2002-08-14 | 2003-08-27 | 李锦添 | Lightning protector |
| CN2588637Y (en) * | 2002-09-06 | 2003-11-26 | 新疆金风科技股份有限公司 | Lightning protector for electric equipment |
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| Publication number | Publication date |
|---|---|
| CN1649228A (en) | 2005-08-03 |
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Free format text: CORRECT: ADDRESS; FROM: STOCKHOLM, SWEDEN TO: NO. 1122, AVENUE F, LORAIN CITY, OHIO, THE USA |
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Effective date of registration: 20110323 Address after: The United States of Ohio city F Lorain Street No. 1122 Patentee after: Emerson Network Power Co., Ltd. Address before: Stockholm, Sweden Patentee before: Emerson Network Power Co., Ltd. |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Patentee before: Emerson Network Power Co., Ltd. |
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Effective date of registration: 20201117 Address after: Columbo Road, Ohio, Dearborn 1050 Patentee after: Dimension Corp. Address before: 1510 Kansas Avenue, Loren, Ohio, USA Patentee before: Emerson Energy Systems, AB |
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