CN206363307U - A kind of serial port circuit of band isolation - Google Patents
A kind of serial port circuit of band isolation Download PDFInfo
- Publication number
- CN206363307U CN206363307U CN201621037687.7U CN201621037687U CN206363307U CN 206363307 U CN206363307 U CN 206363307U CN 201621037687 U CN201621037687 U CN 201621037687U CN 206363307 U CN206363307 U CN 206363307U
- Authority
- CN
- China
- Prior art keywords
- power supply
- chip
- electric capacity
- isolation
- voltage
- 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.)
- Active
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 8
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 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 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Elimination Of Static Electricity (AREA)
- Power Sources (AREA)
Abstract
本实用新型提供一种带隔离的串口电路，其特征在于：包括232芯片U1，隔离芯片U2，DC/DC隔离电源U3，稳压二极管D1，TVS管V1、V2，电阻R1、R2、R3、R4，电容C1、C2、C3、C4、C5、C6、C7、C8、C9、C10、C11、C12，RJ45口J1组成，隔离电源U3将输入的电源VCC_5V，转化为隔离的5V电源VCC_5V_2供给隔离芯片U2和232芯片U1；稳压二极管D1将输出的电压限制在一定的幅度之内，防止隔离电源U3电压输出过高。可有效地防止外部干扰损坏内部电路，可以将干扰滤除在外，保证装置的正常运行。可以在恶劣的环境下稳定运行，具有工作性能稳定，抗干扰能力强等优点。
The utility model provides a serial port circuit with isolation, which is characterized in that it includes 232 chip U1, isolation chip U2, DC/DC isolation power supply U3, voltage stabilizing diode D1, TVS tubes V1, V2, resistors R1, R2, R3, R4, capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, RJ45 port J1, the isolated power supply U3 converts the input power supply VCC_5V into an isolated 5V power supply VCC_5V_2 for isolation Chip U2 and 232 chip U1; Zener diode D1 limits the output voltage within a certain range to prevent the voltage output of the isolated power supply U3 from being too high. It can effectively prevent external interference from damaging the internal circuit, filter out the interference, and ensure the normal operation of the device. It can run stably in harsh environments, and has the advantages of stable working performance and strong anti-interference ability.
Description
Technical field
The utility model is related to the technical field of distribution automation, more particularly to the serial port circuit that a kind of band is isolated.
Background technology
Serial ports is also known as serial communication interface, and serial ports is the more commonly used interface in personal computer, in serial communication,
It is required that communication two party allows different equipment easily to connect and communicated all using a standard interface.Standard
Serial line interface is connected using DB-9 connectors, there is 9 signals, in automatic field, general only to use RXD, TXD, GND tri-
Line, is a kind of very general interface, facilitate device debugging and equipment between short haul connection.
In industrial environment, because use environment is more severe, such as impact, electrostatic when thunderbolt, killer switch are put
Electricity etc., requires higher to the antijamming capability of circuit.If directly device serial ports directly led out without isolation,
When there is interference, interference can be directly entered CPU by serial ports, damage CPU, cause device to be stopped, and influence great.Cause
This, it is necessary to design a kind of serial port circuit of band isolation.
Utility model content
The purpose of this utility model is to provide the serial port circuit that band is isolated, solves in the case of bad environments and work, resist
Interference performance is poor, poor work stability, device easily impacted be stopped and cause the problems such as industrial efficiency is low.
The utility model provides a kind of serial port circuit of band isolation, it is characterised in that：Including 232 chip U1, isolating chip
U2, DC/DC insulating power supply U3, voltage-regulator diode D1, TVS pipe V1, V2, resistance R1, R2, R3, R4, electric capacity C1, C2, C3, C4,
C5, C6, C7, C8, C9, C10, C11, C12, RJ45 mouthfuls of J1 composition, insulating power supply U3 by the power supply VCC_5V of input, be converted into every
From 5V power supplys VCC_5V_2 supply isolating chip U2 and 232 chip U1, voltage-regulator diode D1 the voltage of output is limited in one
Within fixed amplitude, prevent that insulating power supply U3 voltage outputs are too high, resistance R3, R4 are load resistance, prevent that insulating power supply U3 is defeated
Go out zero load, electric capacity C9, C10, C11, C12 are power filtering capacitor, prevent influence of the High-frequency Interference to power supply.
It is preferred that, it is defeated that CPU side signal includes VCC_5V, GND, VCC_3.3V, serial ports input signal UART_SIN1, serial ports
Go out signal UART_SOUT1, other signals are isolated by DC/DC insulating power supplies U3 and isolating chip U2 with CPU side signal, prevented
External signal disturbs CPU side signal.
It is preferred that, the serial ports input signal UART_SIN1 and serial ports output signal U ART_SOUT1 are through isolating chip U2
After isolation, it is connected, then is connected through resistance R1, R2 with RJ45 mouthfuls of J1 with 232 chip U1, here by RJ45 mouthfuls of connection, you can with
The space on pcb board is saved, and then reduces the size of device.
It is preferred that, described electric capacity C3, C5, C6, C7, C8 are power filtering capacitor, prevent influence of the High-frequency Interference to power supply；
Electric capacity C2, C4 play a part of charge pump, and 5V signal can be converted into 232 level of standard；Electric capacity C1 is safety electric capacity,
Play a part of leakage current, prevent interference from further sealing in internal circuit, TVS pipe V1, V2 can prevent static discharge to circuit
Influence.
The serial port circuit for the band isolation that the utility model is provided has advantages below：
1st, the serial port circuit of band isolation disclosed in the utility model, can effectively prevent external disturbance from damaging internal electricity
Road, can be by interference filtering outside, it is ensured that the normal operation of device.
2nd, the serial port circuit of band isolation described in the utility model can be in stable operation under rugged environment, with work
The advantages of performance stabilization, strong antijamming capability.
Brief description of the drawings
Fig. 1 is the structure arrangement schematic diagram described in the utility model for being applied to the serial port circuit with isolation.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below by accompanying drawing and implementation
Example, is described in further detail to the technical solution of the utility model.It should be appreciated that specific reality described herein
Apply example to be only used for explaining principle of the present utility model, be not used to limit the utility model.
The utility model provides a kind of serial port circuit of band isolation, as shown in figure 1, the serial port circuit of band isolation includes
232 chip U1, isolating chip U2, DC/DC insulating power supply U3, voltage-regulator diode D1, TVS pipe V1, V2, resistance R1, R2, R3, R4,
Electric capacity C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, RJ45 mouthfuls of J1 compositions, insulating power supply U3 is by the electricity of input
Source VCC_5V, the 5V power supplys VCC_5V_2 supply isolating chip U2 and 232 chip U1, voltage-regulator diode D1 for being converted into isolation will be defeated
The voltage gone out is limited within certain amplitude, prevents that insulating power supply U3 voltage outputs are too high, and resistance R3, R4 are load resistance,
Insulating power supply U3 output no-loads are prevented, electric capacity C9, C10, C11, C12 are power filtering capacitor, prevent High-frequency Interference to power supply
Influence.
It is preferred that, it is defeated that CPU side signal includes VCC_5V, GND, VCC_3.3V, serial ports input signal UART_SIN1, serial ports
Go out signal UART_SOUT1, other signals are isolated by DC/DC insulating power supplies U3 and isolating chip U2 with CPU side signal, prevented
External signal disturbs CPU side signal.
It is preferred that, the serial ports input signal UART_SIN1 and the serial ports output signal U ART_SOUT1 are through isolated core
After piece U2 isolation, it is connected, then is connected through resistance R1, R2 with RJ45 mouthfuls of J1 with 232 chip U1, is connected here by RJ45 mouthfuls, i.e.,
The space on pcb board can be saved, and then reduces the size of device.
It is preferred that, described electric capacity C3, C5, C6, C7, C8 are power filtering capacitor, prevent influence of the High-frequency Interference to power supply；
Electric capacity C2, C4 play a part of charge pump, and 5V signal can be converted into 232 level of standard；Electric capacity C1 is safety electric capacity,
Play a part of leakage current, prevent interference from further sealing in internal circuit, TVS pipe V1, V2 can prevent static discharge to circuit
Influence.
The serial port circuit of band isolation disclosed in the utility model, can effectively prevent external disturbance from damaging internal electricity
Road, can be by interference filtering outside, it is ensured that the normal operation of device.Can be in stable operation under rugged environment, with work
The advantages of performance stabilization, strong antijamming capability.
Above-described embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step is described in detail.The utility model still has numerous embodiments, institute formed by all use equivalents or equivalent transformation
There is technical scheme, all fall within protection domain of the present utility model.
Claims (2)
1. a kind of serial port circuit of band isolation, it is characterised in that：Including 232 chip U1, isolating chip U2, DC/DC insulating power supply
U3, voltage-regulator diode D1, TVS pipe V1, V2, resistance R1, R2, R3, R4, electric capacity C1, C2, C3, C4, C5, C6, C7, C8, C9,
The power supply VCC_5V of input is converted into the 5V power supplys VCC_ of isolation by C10, C11, C12, RJ45 mouthfuls of J1 compositions, insulating power supply U3
5V_2 supplies isolating chip U2 and 232 chip U1；The voltage of output is limited within certain amplitude by voltage-regulator diode D1, is prevented
Only insulating power supply U3 voltage outputs are too high；Resistance R3, R4 are load resistance, prevent insulating power supply U3 output no-loads；Electric capacity C9,
C10, C11, C12 are power filtering capacitor, prevent influence of the High-frequency Interference to power supply；CPU side signal include VCC_5V, GND,
VCC_3.3V, serial ports input signal UART_SIN1, serial ports output signal U ART_SOUT1, other signals pass through with CPU side signal
DC/DC insulating power supplies U3 and isolating chip U2 isolation, prevents external signal from disturbing CPU side signal；The serial ports input signal
After UART_SIN1 and serial ports output signal U ART_SOUT1 isolates through isolating chip U2, it is connected with 232 chip U1, then through resistance
R1, R2 are connected with RJ45 mouthfuls of J1, here by RJ45 mouthfuls of connections, you can to save the space on pcb board, and then reduce device
Size.
2. the serial port circuit of band isolation according to claim 1, it is characterised in that：Described electric capacity C3, C5, C6, C7, C8 are
Power filtering capacitor, prevents influence of the High-frequency Interference to power supply；Electric capacity C2, C4 play a part of charge pump, can be by 5V letter
Number it is converted into 232 level of standard；Electric capacity C1 is safety electric capacity, plays a part of leakage current, prevents interference from further sealing in
Internal circuit, TVS pipe V1, V2 can prevent influence of the static discharge to circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621037687.7U CN206363307U (en) | 2016-09-05 | 2016-09-05 | A kind of serial port circuit of band isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621037687.7U CN206363307U (en) | 2016-09-05 | 2016-09-05 | A kind of serial port circuit of band isolation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206363307U true CN206363307U (en) | 2017-07-28 |
Family
ID=59369382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621037687.7U Active CN206363307U (en) | 2016-09-05 | 2016-09-05 | A kind of serial port circuit of band isolation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206363307U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388190A (en) * | 2018-05-07 | 2018-08-10 | 中山永裕智能科技有限公司 | A kind of sewing machine control system and sewing machine |
-
2016
- 2016-09-05 CN CN201621037687.7U patent/CN206363307U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388190A (en) * | 2018-05-07 | 2018-08-10 | 中山永裕智能科技有限公司 | A kind of sewing machine control system and sewing machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104135148B (en) | A kind of usb circuit | |
| CN104317760B (en) | A kind of isolating and protecting device of USB3.0 interface at full speed | |
| US20140036400A1 (en) | Protection circuit of power over ethernet port and ethernet power-sourcing equipment | |
| CN102611091A (en) | Lightning stroke prevention surge test protection circuit for electronic equipment | |
| CN102842903A (en) | Power over Ethernet system and surge protection device thereof | |
| CN101719665B (en) | Ethernet port lightning protection device and lightning protection circuit | |
| CN206363307U (en) | A kind of serial port circuit of band isolation | |
| CN105703345A (en) | USB electrostatic protection circuit | |
| CN102545373A (en) | Dual power switching device for intelligent electronic equipment | |
| CN206282265U (en) | A kind of hot-plug protection system | |
| CN202550527U (en) | Special driver 485 communication circuit for intelligent motor | |
| CN206224464U (en) | A kind of communicator with antijamming capability | |
| CN204334358U (en) | A kind of interface power supply circuit being applicable to computer | |
| CN103973290A (en) | Transmission circuit for Ethernet and protection element group thereof | |
| CN103633985A (en) | RS485 communication circuit | |
| CN207853916U (en) | A kind of communication manager serial ports test device | |
| CN105068443B (en) | A kind of design method of safe interface device for HWIL simulation | |
| CN203086124U (en) | USB 3.0 port static electricity discharge circuit and USB 3.0 port | |
| CN202285370U (en) | System power supply module used in underground measuring instrument | |
| CN206639216U (en) | A kind of RS232 interface EMC Design circuit | |
| CN207965879U (en) | Usb data signal transmission isolating device | |
| CN206322953U (en) | A kind of RJ45 connectors of integrated lightning protection function | |
| CN206370683U (en) | An optocoupler isolation lightning protection circuit for practical switching value input digital signal | |
| CN205265224U (en) | Current foldback circuit | |
| CN204392103U (en) | A kind of power circuit for switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |