CN211859600U - Lightning protection diode device - Google Patents
Lightning protection diode device Download PDFInfo
- Publication number
- CN211859600U CN211859600U CN202020538066.7U CN202020538066U CN211859600U CN 211859600 U CN211859600 U CN 211859600U CN 202020538066 U CN202020538066 U CN 202020538066U CN 211859600 U CN211859600 U CN 211859600U
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- inductance
- discharge tube
- overvoltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000001629 suppression Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000452 restraining effect Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 description 6
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a lightning protection diode device belongs to electronic circuit technical field, including inductance suppression circuit and excessive pressure ground protection circuit, excessive pressure ground protection circuit one end is connected with the output of external detection loop, and the other end is connected with inductance suppression circuit, and inductance suppression circuit is connected with alarm system through diode circuit. The utility model discloses a set up discharge tube and piezo-resistor, can the hou mian diode circuit of effectual protection and alarm system, after the thunder and lightning got off from detecting loop, can directly follow overvoltage earthing protection circuit access ground, played the effect of earial drainage, the effectual effect of restraining the electric current that carries on of inductance suppression circuit simultaneously, effectual the hou mian diode circuit and alarm system of having protected.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a lightning protection diode device.
Background
The detection loop is generally connected with an alarm system or other alarm systems along the railway, the detection loop is a loop which is connected with a series of sensors and is arranged on a detection net, the length of the loop is dozens of meters to hundreds of meters, and the detection net is open air and is arranged on the bottom of a mountain or the waist of the mountain, so the loop is easy to be split by a thunder or has thunder induction, the induction thunder enters a diode or even a detection device through the detection loop, and the diode or the detection device is split, so a lightning protection device is required to be arranged for protection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a lightning protection diode device solves the railway alarm system along the line and is split or have the technical problem of thunder and lightning response by the thunder easily.
A lightning protection diode device comprises an inductance suppression circuit and an overvoltage grounding protection circuit, wherein one end of the overvoltage grounding protection circuit is connected with the output end of an external detection loop, the other end of the overvoltage grounding protection circuit is connected with the inductance suppression circuit, and the inductance suppression circuit is connected with an alarm system through a diode circuit.
The inductance suppression circuit comprises an inductance L1 and an inductance L2, one end of the inductance L1 is connected with the overvoltage grounding protection circuit, the other end of the inductance L1 is connected with the diode circuit, one end of the inductance L2 is connected with the overvoltage grounding protection circuit, and the other end of the inductance L2 is connected with the diode circuit.
The diode circuit comprises a diode D1 and a diode D2, wherein the input end of the diode D1 is connected with the alarm system, the output end of the diode D1 is connected with an inductor L1, the input end of the diode D2 is connected with an inductor L2, and the output end of the diode D2 is connected with the alarm system.
The inductor L1 and the inductor L2 are common mode inductors, the common mode inductors are two groups of coils which are wound on the same iron core and have the same number of turns, the same diameter of the lead and opposite winding directions, and magnetic fluxes formed by the two inductors are mutually counteracted, so that the inductance of the coils is increased, the coils are made to be high-impedance, a strong suppression effect is generated, and common mode current is attenuated.
The overvoltage grounding protection circuit comprises resistors R1-R3 and a discharge tube T1-T2, wherein the input end of the discharge tube T1 is respectively connected with one end of an inductor L1, one end of a resistor R3 and an input X1 line of an external detection loop, the output end of the discharge tube T1 is respectively connected with one end of an inductor L2, one end of the resistor R2 and an input X2 line of the external detection loop, the other end of the resistor R2 is connected with the input end of a discharge tube T2, the other end of the resistor R1 is connected with the output end of the discharge tube T2, and the grounding end of the discharge tube T2 is grounded.
The resistors R1-R3 are all piezoresistors, and the discharge tubes T1-T2 are all ceramic discharge tubes of the type 3R 230.
The utility model adopts the above technical scheme, the utility model discloses following technological effect has:
the utility model discloses a set up discharge tube and piezo-resistor, can the hou mian diode circuit of effectual protection and alarm system, after the thunder and lightning got off from detecting loop, can directly follow overvoltage earthing protection circuit access ground, played the effect of earial drainage, the effectual effect of restraining the electric current that carries on of inductance suppression circuit simultaneously, effectual the hou mian diode circuit and alarm system of having protected.
Drawings
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a schematic diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in fig. 1-2, according to the utility model discloses a lightning protection diode device, including inductance suppression circuit and excessive pressure ground protection circuit, excessive pressure ground protection circuit one end is connected with the output of external detection loop, and the other end is connected with inductance suppression circuit, and inductance suppression circuit is connected with alarm system through diode circuit. The inductance suppression circuit comprises an inductance L1 and an inductance L2, one end of the inductance L1 is connected with the overvoltage grounding protection circuit, the other end of the inductance L1 is connected with the diode circuit, one end of the inductance L2 is connected with the overvoltage grounding protection circuit, and the other end of the inductance L2 is connected with the diode circuit. The diode circuit comprises a diode D1 and a diode D2, wherein the input end of the diode D1 is connected with the alarm system, the output end of the diode D1 is connected with an inductor L1, the input end of the diode D2 is connected with an inductor L2, and the output end of the diode D2 is connected with the alarm system.
As shown in fig. 2, the overvoltage ground protection circuit includes resistors R1-R3 and discharge tubes T1-T2, wherein input terminals of the discharge tube T1 are respectively connected to one end of an inductor L1, one end of a resistor R3 and an input X1 of an external detection loop, output terminals of the discharge tube T1 are respectively connected to one end of an inductor L2, one end of the resistor R2 and an input X2 of the external detection loop, the other end of the resistor R2 is connected to an input terminal of a discharge tube T2, the other end of the resistor R1 is connected to an output terminal of the discharge tube T2, and a ground terminal of the discharge tube T2 is grounded. The resistors R1-R3 are all piezoresistors, and the discharge tubes T1-T2 are all ceramic discharge tubes of the type 3R 230. 20D241K was used as the resistor, and the discharge tube was a gas discharge tube.
Because the discharge tube has residual voltage, if the discharge tube with higher residual voltage is selected (so as to meet 1.7 times of the highest input voltage), the ignition breakdown voltage of the discharge tube is also very high, which may not play an overvoltage protection role for some equipment requiring lower protection voltage, so that the discharge tube with lower residual voltage can be selected to be used in series with the piezoresistor, thus the threshold of surge voltage can be reduced, and meanwhile, the discharge tube also plays a certain protection role for the piezoresistor (the voltage applied to two ends of the piezoresistor is relatively reduced).
In addition, the piezoresistor has larger leakage current due to larger parasitic capacitance, and the leakage current of the gas discharge tube is very small, so that the system has almost no leakage current. In the absence of transient voltages, the GDT isolates the MOV from the system, making the shunt leakage very low. When overvoltage occurs, the discharge tube discharges, which is mainly acted by the varistor, because the voltage drop generated by the discharge tube is low. The interference returns to the off state after the interference has passed to isolate the varistor from ground. The piezoresistors can also be isolated by gas discharge tubes if short-circuit failure occurs during surge energy absorption.
In the communication circuit, the varistor must be used in series with the discharge tube because the distributed capacitance of the varistor is very large (hundreds of PF to thousands of PF) and the distributed capacitance of the discharge tube is very small (only a few PF) without short-circuiting the signal.
As shown in fig. 2, the specific process of circuit protection is as follows:
1. when an induction lightning enters the lead X1 from the pin 1 of the interface J2, a potential difference is formed between the X1 and the ground wire G, namely when the voltage between the X1 and the G is larger than the threshold voltages of the R3 and the T2, the R3 and the T2 are conducted, and the induction lightning flows to the ground wire G.
2. When an induction lightning enters the lead X2 from the pin 3 of the interface J2, a potential difference is formed between the X2 and the ground wire G, namely when the voltage between the X2 and the G is larger than the threshold voltages of the R2 and the T2, the R2 and the T2 are conducted, and the induction lightning flows to the ground wire G.
3. When the inductive lightning enters from any pin 1 or 3 of J2, a potential difference is formed between X1 and X2, namely when the voltage between X1 and X2 is larger than the threshold voltage of R1 and T1, R1 and T1 are conducted, X1 and X2 are short-circuited, the inductive lightning flows from X1 to X2 or from X2 to X1, and simultaneously flows from R2, R3 and T2 to the ground G, and the leakage current is accelerated.
4. The inductor has the function of inhibiting the change of current, the rising rate of lightning is fast, and the function of the inductor is that the current passing through the inductor cannot jump and is prevented from passing fast. Without the inductor, the inductive lightning partially flows to the protected devices D1 and D2 before it is affected by the piezoresistors and the ceramic discharge tubes. When the inductor is added, the inductor has a certain inhibiting effect on the sudden change current, so that when the lightning is induced, the piezoresistor is firstly influenced by the ceramic discharge tube to remove a high voltage, then the voltage remained in the rear-stage circuit is the residual voltage on the piezoresistor and the ceramic discharge tube, and the proper inductor size is selected to reduce the residual voltage to the voltage which can be accepted by the protected device.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A lightning protection diode device, its characterized in that: the overvoltage grounding protection circuit comprises an inductance suppression circuit and an overvoltage grounding protection circuit, wherein one end of the overvoltage grounding protection circuit is connected with the output end of an external detection loop, the other end of the overvoltage grounding protection circuit is connected with the inductance suppression circuit, and the inductance suppression circuit is connected with an alarm system through a diode circuit.
2. The lightning protection diode device of claim 1, wherein: the inductance suppression circuit comprises an inductance L1 and an inductance L2, one end of the inductance L1 is connected with the overvoltage grounding protection circuit, the other end of the inductance L1 is connected with the diode circuit, one end of the inductance L2 is connected with the overvoltage grounding protection circuit, and the other end of the inductance L2 is connected with the diode circuit.
3. The lightning protection diode device of claim 2, wherein: the diode circuit comprises a diode D1 and a diode D2, wherein the input end of the diode D1 is connected with the alarm system, the output end of the diode D1 is connected with an inductor L1, the input end of the diode D2 is connected with an inductor L2, and the output end of the diode D2 is connected with the alarm system.
4. A lightning protection diode device according to claim 3, characterized in that: the overvoltage grounding protection circuit comprises resistors R1-R3 and a discharge tube T1-T2, wherein the input end of the discharge tube T1 is respectively connected with one end of an inductor L1, one end of a resistor R3 and an input X1 line of an external detection loop, the output end of the discharge tube T1 is respectively connected with one end of an inductor L2, one end of the resistor R2 and an input X2 line of the external detection loop, the other end of the resistor R2 is connected with the input end of a discharge tube T2, the other end of the resistor R1 is connected with the output end of the discharge tube T2, and the grounding end of the discharge tube T2 is grounded.
5. The lightning protection diode device of claim 4, wherein: the resistors R1-R3 are all piezoresistors, and the discharge tubes T1-T2 are all ceramic discharge tubes of the type 3R 230.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538066.7U CN211859600U (en) | 2020-04-13 | 2020-04-13 | Lightning protection diode device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538066.7U CN211859600U (en) | 2020-04-13 | 2020-04-13 | Lightning protection diode device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211859600U true CN211859600U (en) | 2020-11-03 |
Family
ID=73143849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020538066.7U Expired - Fee Related CN211859600U (en) | 2020-04-13 | 2020-04-13 | Lightning protection diode device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211859600U (en) |
-
2020
- 2020-04-13 CN CN202020538066.7U patent/CN211859600U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103474977B (en) | A kind of lightning protection device, lightning protection combination and lightning protection cabinet | |
| US8503150B2 (en) | Electrical interface protecting apparatus | |
| CN106093494A (en) | A kind of signal for electronic mutual inductor protects filter circuit | |
| CN103795053A (en) | Novel lightning protection device for antenna port | |
| CN102611091A (en) | Lightning stroke prevention surge test protection circuit for electronic equipment | |
| CN105119260A (en) | Two-wire system channel lightning protection apparatus circuit structure | |
| CN202159972U (en) | Signal lightning protection device | |
| CN103414177A (en) | Electromagnetic protection circuit of analog signal input line | |
| EP4318839A1 (en) | Charging device interface circuit and charging device | |
| CN211859600U (en) | Lightning protection diode device | |
| CN204578080U (en) | A kind of surge protection circuit | |
| CN213212572U (en) | Lightning protection type anti-interference isolator of electric power meter reading system | |
| CN211405467U (en) | Electric power direct current signal acquisition return circuit protection circuit | |
| CN220822912U (en) | EMC filter circuit | |
| CN208623329U (en) | One kind having the compatible immunity to interference mould group of lightning protection EMC multifunction electromagnetic | |
| CN107017612A (en) | The protection against lightning surge circuit and its implementation of a kind of gigabit Ethernet mouthful | |
| CN110429565A (en) | A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer | |
| CN115877050A (en) | Lightning impulse neutral point current waveform high-frequency oscillation suppressor and test circuit | |
| CN212462773U (en) | High-voltage filtering protection circuit | |
| JP2010207057A (en) | Lightning arrester | |
| CN110190480A (en) | USB data line | |
| CN203086133U (en) | Lightning prevention and surge current prevention circuit | |
| CN106655135A (en) | CAN bus lightning protection device capable of automatically detecting lightning stroke number | |
| CN217956691U (en) | Anti-surge protection circuit | |
| CN207336589U (en) | A kind of filter being applied in EMC test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201103 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |