CN207082106U - Protection circuit and interface switching device for serial communication - Google Patents
Protection circuit and interface switching device for serial communication Download PDFInfo
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- CN207082106U CN207082106U CN201721000162.0U CN201721000162U CN207082106U CN 207082106 U CN207082106 U CN 207082106U CN 201721000162 U CN201721000162 U CN 201721000162U CN 207082106 U CN207082106 U CN 207082106U
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- protection circuit
- serial port
- isolator
- interface
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Abstract
The utility model discloses a kind of protection circuit and interface switching device for serial communication.Wherein, the protection circuit includes：Serial port chip；Serial port connector, it is connected with serial port chip, includes at least one following to serial port chip, serial port connector for receiving serial communication signal, and serial communication signal being transmitted：Using the first serial line interface of the first running parameter, the second serial line interface using the second running parameter；Wherein, Transient Suppression Diode, the first high pressure ceramic disc capacitor and first resistor are connected between serial port connector and serial port chip in turn in order.The utility model solves the technical problem that existing serial ports EMC protectiving schemes can only realize the serial communication for protecting a kind of pattern and protection effect difference.
Description
Technical field
Circuit field is the utility model is related to, in particular to a kind of protection circuit and interface for serial communication
Conversion equipment.
Background technology
EMC (Electro Magnetic Compatibility) is Electro Magnetic Compatibility, refers to equipment or system in its electromagnetism
The operation that met the requirements in environment does not produce the ability of unaffordable electromagnetic interference to any equipment in its environment.It includes
The requirement of two aspects：On the one hand refer to equipment in normal course of operation to electromagnetic interference caused by the environment of place no more than
Certain limit value；On the other hand refer to that equipment has a certain degree of immunity to interference to electromagnetic interference present in the environment of place, i.e.,
Electromagnetic susceptibility.In other words, EMC protection is in order to which equipment or system can be transported in complex environment normally to a certain extent
Make, while also surrounding enviroment are not produced with serious interference.Especially industrial equipment is mostly to apply compared with complex environment, therefore
EMC protection is most important.
PCIE full name is PCI Express, is the universal serial bus using point-to-point transmission, with traditional pci bus not
With each equipment can have the special connection of oneself, without that to whole bus request bandwidth, can greatly improve data
Transmission rate, thus be widely used in PC mainboard, industrial control mainboard and embedded main board.Due to being led in Industry Control
Domain, serial ports are a kind of conventional communication interfaces, and the serial port board for possessing PCIE interfaces can be that main equipment expands out multiple serial ports.It is many
Well known, there is electromagnetic interference in serial communication, in order to which equipment or system can be transported in complex environment normally to a certain extent
Make, while also surrounding enviroment are not produced with serious interference, EMC (Electro Magnetic Compatibility, i.e. electromagnetism
Compatibility) protection it is particularly significant.
Existing technical grade PCIE turns 8 road UART 4 grades of designs of EMC electric power, only protects the serial ports of a certain pattern to lead to
Letter, due to the signal difference of different communication protocol, prior art is difficult to the serial ports EMC that a kind of scheme is applied to different mode
Protection.Further, since carrying out surge protection need to release, energy, pressure-resistant to casing, needs signal, isolator separates safety with casing
Distance, surge and pressure-resistant preventing principle are contradiction, and the equalization point that find therebetween is difficult, thus, existing work
PCIE turns of 8 road UART of industry level 4 grades of designs of EMC electric power can only realize one of them to surge and pressure-resistant protection.
For it is above-mentioned the problem of, not yet propose effective solution at present.
Utility model content
The utility model embodiment provides a kind of protection circuit and interface switching device for serial communication, with least
Solve existing serial ports EMC protectiving schemes can only realize the serial communication for protecting a kind of pattern and protection effect difference technology ask
Topic.
According to the one side of the utility model embodiment, there is provided a kind of protection circuit for serial communication, including：
Serial port chip；Serial port connector, it is connected with serial port chip, is transmitted for receiving serial communication signal, and by serial communication signal
To serial port chip, serial port connector includes at least one following：Using the first serial line interface of the first running parameter, using second
Second serial line interface of running parameter；Wherein, it is connected with transient state suppression between serial port connector and serial port chip in turn in order
Diode, the first high pressure ceramic disc capacitor and first resistor.
According to the another aspect of the utility model embodiment, a kind of interface switching device is additionally provided, including：Above-mentioned use
In the protection circuit of serial communication.
In the utility model embodiment, after rs 232 serial interface signal is received by serial port connector, rs 232 serial interface signal passes through successively
Serial port chip is transferred to after crossing Transient Suppression Diode, the first high pressure ceramic disc capacitor and first resistor, wherein, reach and passed through
Change running parameter to realize the purpose of the anti-tampering protection of the electromagnetism of a variety of serial line interfaces, it is achieved thereby that the string to different mode
Port communications carry out fast wink, surge and it is pressure-resistant take into account the technique effect of protection, and then solve existing serial ports EMC protectiving schemes only
The technical problem of the serial communication for protecting a kind of pattern and protection effect difference can be realized.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, forms the part of the application,
Schematic description and description of the present utility model is used to explain the utility model, does not form to of the present utility model improper
Limit.In the accompanying drawings：
Fig. 1 is a kind of protection circuit schematic diagram for serial communication according to the utility model embodiment；
Fig. 2 is according to a kind of optionally with the protection circuit schematic diagram of serial communication of the utility model embodiment；
Fig. 3 is to be illustrated according to a kind of of the utility model embodiment optionally with the circuit protected in serial ports RS485EMC
Figure；
Fig. 4 is to be illustrated according to a kind of of the utility model embodiment optionally with the circuit protected in serial ports RS232EMC
Figure.
Embodiment
In order that those skilled in the art more fully understand the utility model, it is real below in conjunction with the utility model
The accompanying drawing in example is applied, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that be described
Embodiment is only the embodiment of the utility model part, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all should
When the scope for belonging to the utility model protection.
It should be noted that term " first " in specification and claims of the present utility model and above-mentioned accompanying drawing,
" second " etc. is for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so
The data used can exchange in the appropriate case, so that embodiment of the present utility model described herein can be with except at this
In diagram or description those beyond order implement.In addition, term " comprising " and " having " and their any deformation, meaning
Figure be to cover it is non-exclusive include, be not necessarily limited to clearly arrange for example, containing a series of system of units, product or equipment
Those units gone out, but may include not list clearly or for the intrinsic other units of these products or equipment.
Embodiment 1
According to the utility model embodiment, there is provided a kind of protection circuit embodiment for serial communication, Fig. 1 is basis
A kind of protection circuit schematic diagram for serial communication of the utility model embodiment, as shown in figure 1, including：
Wherein, serial port chip 1；
Serial port connector 2, it is connected with serial port chip 1, is transmitted for receiving serial communication signal, and by serial communication signal
To serial port chip 1, serial port connector 2 includes at least one following：Using the first serial line interface 2-1 of the first running parameter, adopt
With the second serial line interface 2-2 of the second running parameter；
Wherein, Transient Suppression Diode 3-1, first are connected between serial port connector 2 and serial port chip 1 in turn in order
High pressure ceramic disc capacitor 3-2 and first resistor 3-3.
Alternatively, above-mentioned serial port connector 2 can communicate between wiring and the serial ports of other equipment or this equipment of serial, serial ports
Signal of communication passes through Transient Suppression Diode, can suppress to disturb caused by voltage fast transient, then by high pressure ceramic disc capacitor,
It can absorb and the energy of release fast wink or surge interference, then reach serial port chip through resistance and communicated, wherein, resistance can be with
Play a part of delay protection.
It should be noted that 6000V can be reached because high pressure ceramic disc capacitor is pressure-resistant so that carrying out surge protection reach common mode ±
4000V, differential mode ± 2000V, thus, the China Power academy of sciences can be met completely《" four unifications, four specifications " data communication network closes
Machine testing scheme (V1.3)》4 grades of carrying out surge protection requirements of electric power of proposition.
From the foregoing, it will be observed that in the above embodiments of the present application, after receiving rs 232 serial interface signal by serial port connector 2, serial ports letter
Number it is transferred to serial ports core after Transient Suppression Diode 3-1, the first high pressure ceramic disc capacitor 3-2 and first resistor 3-3 successively
Piece, wherein, serial port connector can connect the serial line interface of different serial port protocols.
By scheme disclosed in the above embodiments of the present application, reach by changing running parameter to realize a variety of serial interfaces
Mouthful the anti-tampering protection of electromagnetism purpose, it is achieved thereby that carrying out fast wink, surge and pressure-resistant simultaneous to the serial communication of different mode
The technique effect of protection is cared for, and then solves existing serial ports EMC protectiving schemes and can only realize and protect a kind of serial ports of pattern to lead to
The technical problem of letter and protection effect difference.
In a kind of optional embodiment, the output end of above-mentioned Transient Suppression Diode access outside isolator 8, above-mentioned the
The output end access the earth 9 of one high pressure ceramic disc capacitor.
Specifically, in the above-described embodiments, the output end of Transient Suppression Diode is accessed into outside isolator, can suppressed
Disturbed caused by fast transient；The output end of first high pressure ceramic disc capacitor is accessed into the earth, fast wink or surge can be disturbed
Energy is released to the earth, so as to eliminate High-frequency Interference.
In a kind of optional embodiment, as shown in Fig. 2 above-mentioned protection circuit also includes：At least one set of insulating power supply 4-1
Isolator 4-2, wherein, the public one group of insulating power supply of every two groups of rs 232 serial interface signals and isolator in the rs 232 serial interface signal of serial port chip.
Based on above-described embodiment, in a kind of optional embodiment, above-mentioned protection circuit can also include：Insulating power supply chip
4-3, for by digital power and being digitally converted to insulating power supply and isolator.
It should be noted that insulating power supply and be isolator by digital power and digitally to be changed by insulating power supply chip
, if 8 road rs 232 serial interface signals, due to the public one group of isolating and protecting of every two groups of rs 232 serial interface signals, then need 4 groups of insulating power supplies and
Isolator.
In a kind of optional embodiment, above-mentioned protection circuit also includes：Second resistance 5, magnetic bead is connected with isolator 4-2
6, it is connected with second resistance, wherein, second resistance and magnetic bead are used to isolator be converted to outside isolator.
It should be noted that high-frequency noise and spike that magnetic bead can be used for suppressing on power line disturb, electrostatic arteries and veins is absorbed
Punching.
In a kind of optional embodiment, above-mentioned protection circuit also includes：Second high pressure ceramic disc capacitor 7, the second high pressure porcelain
The first end of chip capacitor 7 is connected with second resistance 5, and the second end of the second high pressure ceramic disc capacitor 7 is connected with the earth 9.
It should be noted that the interference on isolator can be released to the earth by above-mentioned second high pressure ceramic disc capacitor 7.
Based on any one above-mentioned optional or preferred embodiment, in a kind of optional embodiment, above-mentioned first is serial
Interface can be serial ports RS232, and above-mentioned second serial line interface can be serial ports RS485.Wherein, it is serial ports in serial port connector
In the case of RS232, the peak-inverse voltage of Transient Suppression Diode uses first voltage；It is serial ports in serial port connector
In the case of RS485, the peak-inverse voltage of Transient Suppression Diode uses second voltage.
If as an alternative embodiment, EMC protection of the above-mentioned protection circuit for serial ports RS232, transient state
It can be SMCJ18CA to suppress diode model, i.e., using 18V peak-inverse voltage；If protection circuit is used for serial ports
RS485 EMC protection, then Transient Suppression Diode model can be SMCJ7.0CA, i.e., using 7V peak-inverse voltage.
It should be noted that by many experiments, surge and the equalization point of pressure-resistant protection can be found, it is fast so as to realize
Wink, surge, pressure-resistant take into account protection；And it is 6000V because high pressure ceramic disc capacitor is pressure-resistant, thus, the application provides each
Carrying out surge protection for serial communication protection circuit embodiment can reach common mode ± 4000V, differential mode ± 2000V requirement.
As a kind of preferred embodiment, Fig. 3 is one kind according to the utility model embodiment optionally with serial ports
The circuit diagram of RS485EMC protection, as shown in figure 3, including：3 model SMCJ7.0CA Transient Suppression Diode is (i.e.
D4, D5 and D6 in Fig. 3), the first high pressure ceramics (i.e. C121 and C120 in Fig. 3) of 2 10NF/6KV/DIP models, 2 75 Europe
The resistance (i.e. R140 and R157) of nurse first resistor.Serial port connector is connect before COM3_D+ and COM3_D- signals, is followed by the first order
TVS device is protected, be i.e. Transient Suppression Diode SMCJ7.0CA, can suppress to disturb caused by fast transient；Protected again through the second level
High pressure ceramic disc capacitor, the effect of high pressure ceramic disc capacitor be can eliminate High-frequency Interference, absorb and release fast wink or surge interference
Energy；Pass through 75 Ohmic resistances again afterwards, resistance is to prevent surge energy instantaneous interference to rear end, and the delay done is moved back
It is even, it is ensured that energy is largely absorbed and released by front end protective device.Press down in PCB design according to serial port connector, to transient state
Diode processed, to high pressure ceramic disc capacitor, to time delay resistance, arrive the order of serial port chip (RS485M3 and RS485P3) again and put
Part and cabling, and 4 groups of insulating power supplies and isolator be spaced apart safety creepage distance, rs 232 serial interface signal and isolator between the earth
Separate safe distance do it is pressure-resistant.For outside isolator, GND_EARTH is the earth to wherein COM3_4_GND, and pick shell.
As another preferred embodiment, Fig. 4 is one kind according to the utility model embodiment optionally with serial ports
The circuit diagram of RS232EMC protection, as shown in figure 4, including：2 model SMCJ18CA Transient Suppression Diode is (i.e.
D7 and D8), the first high pressure ceramics (i.e. C123 and C122 in Fig. 4) of 2 10NF/6KV/DIP models, 2 75 ohm first electricity
The resistance (i.e. R136 and R138 in Fig. 4) of resistance, the second high pressure ceramics of 1 10NF/6KV/DIP model, second resistance are 10 Europe
Nurse (R156), its principle and function are the same as serial ports 485；Wherein ISO3_4 for isolator, COM3_4_GND for it is outside isolator, GND_
EARTH is the earth, and pick shell, and TX3 is to send signal wire, and RX3 is reception signal line.
Pass through above-described embodiment, it is proposed that a kind of technical grade PCIE turns of 8 road UART EMC fast winks, surge, pressure-resistant protection electricity
Power level Four designs, and can protect serial ports 232 or 4 grades of 485 Communication power of serial ports fast wink, surge, pressure-resistant interference, and carrying out surge protection reaches altogether
Mould ± 4000V, differential mode ± 2000V, this department technical grade serial equipment normally can be operated in complex environment, while also not to week
Surrounding environment produces serious interference.
Embodiment 2
According to the utility model embodiment, additionally provide in a kind of interface switching device, including embodiment 1 that any one can
Protection circuit that is choosing or being preferably used in serial communication.
As a kind of optional embodiment, above-mentioned interface switching device is the interface switching device that PCIE turns serial ports.
Alternatively, above-mentioned PCIE turn serial ports interface switching device can apply to existing technical grade PCIE turn 8 road UART
The design of 4 grades of EMC electric power in, serial ports 232 or serial ports 485 can be protected, the protectiving scheme of the serial ports of both of which is identical, simply
Specific protective device parameter slightly has difference.
Above-mentioned the utility model embodiment sequence number is for illustration only, does not represent the quality of embodiment.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (10)
- A kind of 1. protection circuit for serial communication, it is characterised in that including：Serial port chip；Serial port connector, it is connected with the serial port chip, is passed for receiving serial communication signal, and by the serial communication signal The serial port chip is transported to, the serial port connector includes at least one following：Using the first serial interface of the first running parameter Mouthful, using the second serial line interface of the second running parameter；Wherein, Transient Suppression Diode, first are connected between the serial port connector and the serial port chip in turn in order High pressure ceramic disc capacitor and first resistor.
- 2. protection circuit according to claim 1, it is characterised in that the output end access of the Transient Suppression Diode is outer Isolator, the output end access of the first high pressure ceramic disc capacitor is greatly in portion.
- 3. protection circuit according to claim 2, it is characterised in that the protection circuit also includes：At least one set of insulating power supply and isolator, wherein, every two groups of rs 232 serial interface signals are public in the rs 232 serial interface signal of the serial port chip One group of insulating power supply and isolator.
- 4. protection circuit according to claim 3, it is characterised in that the protection circuit also includes：Insulating power supply chip, for by digital power and be digitally converted to the insulating power supply and it is described isolator.
- 5. protection circuit according to claim 3, it is characterised in that the protection circuit also includes：Second resistance, isolator it is connected with described；Magnetic bead, it is connected with the second resistance, wherein, the second resistance and the magnetic bead are used to isolator be converted to described The outside is isolator.
- 6. protection circuit according to claim 5, it is characterised in that the protection circuit also includes：Second high pressure ceramic disc capacitor, the first end of the second high pressure ceramic disc capacitor are connected with the second resistance, and described second Second end of high pressure ceramic disc capacitor is connected with the earth.
- 7. protection circuit as claimed in any of claims 1 to 6, it is characterised in that first serial line interface is Serial ports RS232, second serial line interface are serial ports RS485.
- 8. protection circuit according to claim 7, it is characterised in thatIn the case where the serial port connector is the serial ports RS232, the peak-inverse voltage of the Transient Suppression Diode Using first voltage；In the case where the serial port connector is the serial ports RS485, the peak-inverse voltage of the Transient Suppression Diode Using second voltage.
- 9. a kind of interface switching device, it is characterised in that including being used for serial communication described in any one in claim 1 to 8 Protection circuit.
- 10. interface switching device according to claim 9, it is characterised in that the interface switching device is that PCIE turns string The interface switching device of mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721000162.0U CN207082106U (en) | 2017-08-10 | 2017-08-10 | Protection circuit and interface switching device for serial communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721000162.0U CN207082106U (en) | 2017-08-10 | 2017-08-10 | Protection circuit and interface switching device for serial communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207082106U true CN207082106U (en) | 2018-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721000162.0U Active CN207082106U (en) | 2017-08-10 | 2017-08-10 | Protection circuit and interface switching device for serial communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207082106U (en) |
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2017
- 2017-08-10 CN CN201721000162.0U patent/CN207082106U/en active Active
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| GR01 | Patent grant | ||
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Denomination of utility model: A protection circuit and interface conversion device for serial communication Effective date of registration: 20190627 Granted publication date: 20180309 Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee Pledgor: Beijing Huadian UTS technology Limited by Share Ltd Registration number: 2019990000624 |