CN206820469U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
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- CN206820469U CN206820469U CN201720363684.0U CN201720363684U CN206820469U CN 206820469 U CN206820469 U CN 206820469U CN 201720363684 U CN201720363684 U CN 201720363684U CN 206820469 U CN206820469 U CN 206820469U
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- level
- protective device
- low pressure
- signalling channel
- voltage
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Abstract
It the utility model is related to a kind of surge protection circuit, including multiple signal channels, multiple one-level low pressure protective devices, one-level high voltage protection device, multiple decoupling devices and multiple two level protective devices；Each signalling channel is subjected to preliminary voltage clamping by the less one-level low pressure protective device of a volume to surge voltage respectively; and energy is carried out by a public one-level high voltage protection device and released; then the residual amount of energy on one-level low pressure protective device is further released by decoupling device and two level protective device; and by the voltage clamping of signalling channel in safe range; surge protection can be realized to the circuit module of signalling channel end; circuit structure is simple, takes small volume.
Description
Technical field
Circuit protection field is the utility model is related to, more particularly to a kind of surge protection circuit.
Background technology
Electronic equipment under electric power and the vehicle-mounted application environment of track, to bear surge impact voltage caused by electromagnetic environment
And will not damage, these electronic equipments generally all take voltage restriction to protect low level signal line.
At present, conventional method is to carry out voltage clamping protection to each signal wire.Specifically, to each signal wire
All carry out energy using high voltage protection device to release, n signal wire then needs n high voltage protection device, and circuit structure is multiple
It is miscellaneous, it is big to take volume.
Utility model content
Based on this, it is necessary to provide a kind of surge protection circuit, circuit structure is simple, takes small volume.
A kind of surge protection circuit, including：
Multiple signal channels, one end per road signalling channel receive electric signal, and the other end connects the circuit mould of electronic equipment
Block, for giving the electric signal transmission to the circuit module each connected；
Multiple one-level low pressure protective devices, one end of each one-level low pressure protective device are connected to signalling channel all the way
On, the other end is all connected with the signal ground of the electronic equipment, for entering to the signalling channel where each one-level low pressure protective device
Row voltage clamping；
One-level high voltage protection device, one end connect each one-level low pressure protective device and described one end being signally connected, separately
One end connects the protecting field of the electronic equipment, is released for carrying out energy to the signalling channel, the one-level high voltage protection
The pressure-resistant of device is higher than the pressure-resistant of the one-level low pressure protective device；
Multiple decoupling devices, one end of each decoupling device connect what the one-level low pressure protective device was connected with signalling channel
One end, the other end connect the circuit module；
Multiple two level protective devices, one end of each two level protective device connect the decoupling device and connected with the circuit module
The one end connect, the other end connects the signal ground of the electronic equipment, for entering to the signalling channel where each two level protective device
The further voltage clamping of row.
Above-mentioned surge protection circuit, including multiple signal channels, multiple one-level low pressure protective devices, one-level high voltage protection device
Part, multiple decoupling devices and multiple two level protective devices；Each signalling channel is low by a less one-level of volume respectively
Press protective device to carry out preliminary voltage clamping to surge voltage, and energy is carried out by a public one-level high voltage protection device
Release, then the residual amount of energy on one-level low pressure protective device is carried out by decoupling device and two level protective device further
Release, and by the voltage clamping of signalling channel in safe range, can realize that surge is protected to the circuit module of signalling channel end
Shield, circuit structure is simple, takes small volume.
In one of the embodiments, the multiple signal channels are low level signal passage.
In one of the embodiments, the one-level low pressure protective device is TSS semiconductor discharge tubes.
In one of the embodiments, the one-level high voltage protection device is gas-discharge tube.
In one of the embodiments, the two level protective device is TVS diode.
In one of the embodiments, the two level protective device is voltage-stabiliser tube.
In one of the embodiments, the decoupling device is resistance.
In one of the embodiments, the resistance of the resistance is 2~5 Ω.
Brief description of the drawings
Fig. 1 is the circuit diagram of surge protection circuit in an embodiment.
Embodiment
Referring to Fig. 1, Fig. 1 is the circuit diagram of surge protection circuit in an embodiment.
In the present embodiment, the surge protection circuit, including multiple signal channels, multiple and of one-level low pressure protective device 12
One-level high voltage protection device 13, multiple decoupling devices 14 and multiple two level protective devices 15.
Multiple signal channels, one end per road signalling channel receive electric signal, and the other end connects the circuit of electronic equipment 10
Module, for giving the electric signal transmission to the circuit module each connected.
Electronic equipment 10 under electric power and the vehicle-mounted application environment of track is in electromagnetic environment, and it has multiple signals to lead to
Road, including signalling channel 1, signalling channel 2 ... signalling channel n, are respectively used to receive different signals, such as signal of communication, control
Signal etc., these signals are low level signal, and each circuit module of electronic equipment 10 receives these signals and carried out corresponding
Processing.Specifically, signalling channel 1 transmits a signal to the first circuit module, signalling channel 2 transmits a signal to second circuit mould
Block, signalling channel n transmit a signal to the n-th circuit module.
When the electric current that the electromagnetic environment residing for electronic equipment 10 flows through is larger or produces instantaneous high pressure, because electromagnetism is imitated
Bigger surge current and surge voltage should will be produced in signalling channel, the signalling channel of electronic equipment 10 is by very big
Interference, the safety of circuit module in possible entail dangers to electronic equipment 10, influence the normal operation of electronic equipment 10.
One end of each one-level low pressure protective device 12 is connected to all the way in signalling channel, and the other end is all connected with the electricity
The signal ground GND1 of sub- equipment 10, for carrying out voltage clamping to the signalling channel where each one-level low pressure protective device 12.
The electronic equipment 10 is floating connection mode, and above-mentioned signal ground GND1 refers to its internal circuit, including foregoing circuit
The ground wire of module connection, the voltage at the ground wire is reference potential 0V, and protecting field GND2 refers to be connected to greatly by device housings
The ground wire on ground, plays a protective role to equipment.Signal ground GND1 is connected with the earth without conductor, is not influenceed by the earth electrical property,
Isolation resistance is very big between signal ground GND1 and protecting field GND2, can prevent altogether impedance circuit coupling caused by electromagnetism do
Disturb.
Specifically, the one-level low pressure protective device 12 is TSS (Thyristor Surge Suppressor, voltage switch
Type Transient Suppression Diode) semiconductor discharge tube, when the overvoltage at TSS semiconductor discharge tubes both ends is discharged more than TSS semiconductors
During the breakdown voltage of pipe, TSS semiconductor discharge tubes are by overvoltage clamper to the level close to 0V lower than its breakdown voltage
On, TSS semiconductor discharge tubes continue this short-circuit condition afterwards, and the overcurrent until flowing through TSS semiconductor discharge tubes, which drops to, faces
After below dividing value, TSS recovers open-circuit condition.Further, it uses DO214AA to encapsulate, and what can be born is instantaneous through-flow reachable
150A, preliminary clamper can be carried out to the surge voltage in signalling channel and energy is released.
One end of one-level high voltage protection device 13 connects each one-level low pressure protective device 12 and is connected with the signal ground GND1
One end, the other end connects the protecting field GND2 of the electronic equipment 10, released for carrying out energy to the signalling channel, one
The pressure-resistant of level high voltage protection device 13 is higher than the pressure-resistant of the one-level low pressure protective device 12.
Surge voltage in signalling channel 1 to signalling channel n carries out preliminary electricity by respective one-level low pressure protective device 12
Pressing tongs position and energy are released, and are carried out substantial amounts of energy by a public one-level high voltage protection device 13 and released, by signal
Voltage on passage drops to certain limit.
Specifically, the one-level high voltage protection device 13 is gas-discharge tube, its voltage that can be born is up to 3500V, can
To carry out the selection of pressure voltage according to the actual requirements, gas-discharge tube, which can play, releases Lightning Transient overcurrent and limited electricity
The effect of pressure, electric energy caused by surge current and surge voltage can be released.When caused surge electricity in signalling channel
When pressure is more than the cut-in voltage sum of one-level low pressure protective device 12 and one-level high voltage protection device 13, the two will be turned off by high resistant
State enters low-resistance conducting state, formed high current (>100A) leakage path and most energy are consumed, form one-level energy
Leakage path.
The volume of one-level low pressure protective device 12 is much smaller than one-level high voltage protection device 13, high by a public one-level
Pressure protective device 13 carries out energy and released, and the surge protection circuit is greatly reduced in the case where ensureing communication port safety
Volume, circuit structure is simple.
One end of each decoupling device 14 connects one end that the one-level low pressure protective device 12 is connected with signalling channel, another
End connects the circuit module.
One end of each two level protective device 15 connects one end that the decoupling device 14 is connected with the circuit module, another
End connects the signal ground GND1 of the electronic equipment 10, for entering traveling one to the signalling channel where each two level protective device 15
The voltage clamping of step.
Due to the C-V characteristic of one-level low pressure protective device 12, when it passes through high current, there will be higher voltage thereon,
The voltage being now carried in signalling channel is still higher, further by Secondary energy leakage path release one-level low pressure protect
Residual amount of energy on device 12, reduce its voltage.Disappear specifically, carrying out energy by decoupling device 14 and two level protective device 15
Consumption, and by the voltage clamping of one-level low pressure protective device 12 to security level, so as to protect the internal circuit mould of electronic equipment 10
Block is from excessive pressure damages.
In one of the embodiments, two level protective device 15 is TVS (Transient Voltage Suppresser winks
State voltage suppressor) diode.It has the response time (subnanosecond level) being exceedingly fast and at a relatively high surge absoption ability.When it
Both ends when being subjected to the high energy impact events of moment, TVS diode can with high speed the impedance value between both ends by high impedance
Be changed into Low ESR, to absorb an instantaneous large-current, so as to its both end voltage strangulation one it is predetermined numerically, and then
By the voltage clamping of signalling channel in security level, circuit module below is protected not impacted by high voltage transient spike.
In one of the embodiments, two level protective device 15 is voltage-stabiliser tube.When the both ends of one-level low pressure protective device 12
For voltage-drop loading when on Secondary energy leakage path, voltage-stabiliser tube enters reverse-conducting state, and the voltage clamping of signalling channel is existed
Its breakdown reverse voltage, and then by the voltage clamping of signalling channel in security level.
Wherein, when cut-in voltage of the surge voltage in signalling channel less than one-level energy leakage path, but two are greater than
During the cut-in voltage of level energy leakage path, surge voltage is all carried on Secondary energy leakage path, two level protective device
15 conductings, i.e. TVS diode or voltage-stabiliser tube conducting, undertake a part of pressure drop, to prevent two level from preventing by above-mentioned decoupling device 14
Shield device 15 persistently bears high pressure and causes over-voltage breakdown or burn, and causes signalling channel short-circuit.
Meanwhile the cut-in voltage of one-level low pressure protective device 12 is rationally designed, when Secondary energy leakage path turns on, and two
Before the voltage that level protective device 15 is born reaches its upper limit, one-level low pressure protector 12 is rapid to be opened, most of surge electricity
Stream passes through from one-level energy leakage path, and fraction surge current flows through two level protective device 15, avoids two level protective device 15
Overcurrent damage.
Specifically, decoupling device 14 is resistance, the resistance of the resistance is 2~5 Ω, can be hindered according to specific demand
The selection of value.
When the voltage in signalling channel is normal, the voltage is less than one-level energy leakage path and Secondary energy leakage path
Cut-in voltage, i.e. one-level low pressure protective device 12, one-level high voltage protection device 13 and two level protective device 15 be in high resistant
Off state, the normal work influence on signalling channel is minimum, can be ignored.
Above-mentioned surge protection circuit, each signalling channel is passed through into the less one-level low pressure protective device of a volume respectively
12 pairs of surge voltages carry out preliminary voltage clamping, and carry out energy by a public one-level high voltage protection device 13 and release,
Then the residual overpressure on one-level low pressure protective device 12 and energy are carried out by decoupling device 14 and two level protective device 15
Further release, and by the voltage clamping of signalling channel in safe range, can be real to the circuit module of signalling channel end
Existing surge protection, circuit structure is simple, takes small volume.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (8)
- A kind of 1. surge protection circuit, it is characterised in that including：Multiple signal channels, one end per road signalling channel receive electric signal, and the other end connects the circuit module of electronic equipment, uses In giving the electric signal transmission to the circuit module that each connects；Multiple one-level low pressure protective devices, one end of each one-level low pressure protective device are connected to all the way in signalling channel, separately One end is all connected with the signal ground of the electronic equipment, for carrying out voltage to the signalling channel where each one-level low pressure protective device Clamper；One-level high voltage protection device, one end connect each one-level low pressure protective device and described one end being signally connected, the other end The protecting field of the electronic equipment is connected, is released for carrying out energy to the signalling channel, the one-level high voltage protection device It is pressure-resistant pressure-resistant higher than the one-level low pressure protective device；Multiple decoupling devices, one end of each decoupling device connect the one-level low pressure protective device is connected with signalling channel one End, the other end connect the circuit module；Multiple two level protective devices, one end of each two level protective device connect what the decoupling device was connected with the circuit module One end, the other end connect the signal ground of the electronic equipment, for entering to advance to the signalling channel where each two level protective device The voltage clamping of one step.
- 2. surge protection circuit according to claim 1, it is characterised in that the multiple signal channels are low level letter Number passage.
- 3. surge protection circuit according to claim 1, it is characterised in that the one-level low pressure protective device is TSS half Conductive discharge pipe.
- 4. surge protection circuit according to claim 1, it is characterised in that the one-level high voltage protection device is put for gas Fulgurite.
- 5. surge protection circuit according to claim 1, it is characterised in that the two level protective device is TVS diode.
- 6. surge protection circuit according to claim 1, it is characterised in that the two level protective device is voltage-stabiliser tube.
- 7. surge protection circuit according to claim 1, it is characterised in that the decoupling device is resistance.
- 8. surge protection circuit according to claim 7, it is characterised in that the resistance of the resistance is 2~5 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720363684.0U CN206820469U (en) | 2017-04-05 | 2017-04-05 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720363684.0U CN206820469U (en) | 2017-04-05 | 2017-04-05 | Surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206820469U true CN206820469U (en) | 2017-12-29 |
Family
ID=60752021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720363684.0U Active CN206820469U (en) | 2017-04-05 | 2017-04-05 | Surge protection circuit |
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| Country | Link |
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| CN (1) | CN206820469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365001A (en) * | 2018-04-11 | 2019-10-22 | 江苏北斗星通汽车电子有限公司 | A kind of surge protection circuit |
-
2017
- 2017-04-05 CN CN201720363684.0U patent/CN206820469U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365001A (en) * | 2018-04-11 | 2019-10-22 | 江苏北斗星通汽车电子有限公司 | A kind of surge protection circuit |
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| GR01 | Patent grant | ||
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Effective date of registration: 20230713 Address after: 518000 1701, Yanxiang Science and Technology Building, No. 31, High-tech Middle 4th Road, Maling Community, Yuehai Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Yanxiang smart IOT Technology Co.,Ltd. Address before: 518107 5th floor, No.1, Yanxiang Zhigu chuangxiangdi, No.11, Gaoxin Road, Guangming New District, Shenzhen City, Guangdong Province Patentee before: EVOC INTELLIGENT TECHNOLOGY Co.,Ltd. |