CN102082612A - Controller area network (CAN) bus-based anti-electromagnetic interference method and device - Google Patents
Controller area network (CAN) bus-based anti-electromagnetic interference method and device Download PDFInfo
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- CN102082612A CN102082612A CN2010105719732A CN201010571973A CN102082612A CN 102082612 A CN102082612 A CN 102082612A CN 2010105719732 A CN2010105719732 A CN 2010105719732A CN 201010571973 A CN201010571973 A CN 201010571973A CN 102082612 A CN102082612 A CN 102082612A
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Abstract
The invention discloses a controller area network (CAN) bus-based anti-electromagnetic interference method and a CAN bus-based anti-electromagnetic interference device, which belong to the technical field of battery electric vehicle buses. Each control unit of a battery electric vehicle shares all information and resources by a CAN bus so as to fulfill the aims of simplifying wiring, reducing the number of sensors, avoiding the repetition of control functions, improving the reliability and maintainability of a system, reducing the cost and better matching and coordinating each control system. The key for well control over the battery electric vehicle is the reliability of CAN bus communication. The battery electric vehicle is a high-mechatronics product, and the whole system may generate a great number of high frequency signals when working to influence the normal communication of the CAN bus. The method and the device aim to improve the anti-interference capability of the CAN bus; and an anti-interference circuit is designed by utilizing the principle of CAN bus transmission, and a common mode choke is arranged to filter common mode electromagnetic interference on a signal wire and suppress the external transmission of own electromagnetic interference so as to greatly improve the reliability of the CAN bus communication.
Description
Technical field
The present invention relates to a kind of anti-electromagnetic interference method and device, belong to pure electric automobile bussing technique field based on the CAN bus.
Background technology
Pure electric automobile is the product of height electromechanical integration, compare with traditional internal-combustion engines vehicle, it has increased many electric components, as motor, electrokinetic cell, power converter and various controllers etc., can produce a large amount of frequency electromagnetic waves during their work and interfere with each other, this just means that pure electric automobile is at the anti-interference more acid test that is faced with of electromagnetism.
It is to realize the key of electric automobile reliability service that pure electric automobile control needs good communication harmony and operational reliability, good communication system.The CAN bus structures are serial communication networks of distributed control of a kind of effective support or real-time control.Pure electric automobile CAN bus structures generally comprise a plurality of equipment such as main electric machine controller, batteries management system, entire car controller and electric automobile on-screen display system of car load power section, carry out data communication and command transfer by CAN between these subsystems, each node device can both independently be finished the operation of self system under the situation that breaks away from the CAN bus, thereby satisfies the needs of vehicle operating fail safe.The phenomenon of system configuration collapse can not appear because of the disengaging of certain equipment in the CAN bus yet simultaneously.
When the whole system of pure electric automobile was worked, the CAN bus was subjected to very big interference.The signal transmission rate of CAN is very big to the power and the Safety Effect of car load; for dynamic property and the fail safe that improves car load; need to improve the antijamming capability of CAN bus; protection power CAN bus is not disturbed by extraneous factor in high speed signal reciprocal process as far as possible, guarantees system's reliability service.
The anti-electromagnetic interference method of using on pure electric automobile at present of CAN bus is the signal end increase photoisolator at the CAN transceiver, makes input and output realize the electrical isolation of signal, plays the filtered signal effects of jamming.Harassing and wrecking have the inhibition effect but photoisolator is to differential mode, and to not obviously effect of common mode harassing and wrecking, can not solve the electromagnetic interference problem on the CAN bus fully.
Summary of the invention
The object of the present invention is to provide a kind of anti-electromagnetic interference method and device based on the CAN bus.The CAN bus signals is a differential signal, and when the whole system of pure electric automobile was worked, the CAN signal can be interfered in transmission course, in order to strengthen the reliability of CAN communication, guarantees that the whole system operation is normal.
The present invention relates to a kind of anti-electromagnetic interference method, comprise that step is as follows based on the CAN bus:
Signal and communication end at the CAN transceiver increases a common mode choke, plays the buffer action to High-frequency Interference.Common mode choke can transmit difference mode signal, and the difference mode signal that direct current and frequency are very low can pass through, and then presents very big impedance for high frequency common mode noise, has brought into play the effect of an impedor.Common mode choke is also referred to as common mode inductance, is the coil that symmetrical coiling direction is opposite on a closed magnet ring, the number of turn is identical.Be usually used in filtering the electromagnetic interference of common mode, suppress the electromagnetic wave outside radiated emission that HW High Way produces, improve the Electro Magnetic Compatibility of system.Its operation principle is to flow through two around to opposite coil the time when operating current, produces two magnetic fields of cancelling out each other, and this moment, operating current mainly was subjected to the damping of little leakage inductance under coil Ohmic resistance and the negligible operating frequency; If when having interference signal to flow through coil, coil promptly presents high impedance, produces very strong damping, reaches the effect of decay interference signal; It comes down to a bidirectional filter, common mode electromagnetic interference on the one hand can the filtered signal line, can inhibition itself outwards not send electromagnetic interference again on the other hand, avoid influencing the operate as normal of other electronic equipments under the same electromagnetic environment, thereby guarantee whole system reliability of operation on CAN communication and the car.
At the high resistance that has disposed two and value 120 Ω with CAN between low of the two ends of CAN bus CAN, its effect is the bus matched impedance, can increase the stability and the antijamming capability of bus transfer, the error rate in the minimizing transfer of data; High and the CAN low signal end placement filter capacitor at CAN, the filtering electrostatic interference improves the reliability of CAN communication.
The CAN bus signals is by carrying out the information transmission between CAN transponder chip TLE6250G and the microcontroller; TLE6250G is the CAN transceiver at automotive environment design, except having as the general function of CAN transceiver, itself also has electrostatic protection and anti-electromagnetic interference.
A kind of anti-electromagnetic interference circuit arrangement based on the CAN bus, first pin 1 of transponder chip links to each other with data receiver (CAN_RXD) with the data sending terminal (CAN_TXD) of microcontroller respectively with the 4th pin 4; The 5th pin 5 connects VCC_5V, promptly links to each other with the 5V power supply; High first resistance that is connected with the low input of CAN of differential signal end CAN and the 3rd resistance are in order to terminated line; Differential signal end CAN is high to be hanged down input with CAN and is connected the 5th electric capacity and the 6th electric capacity and is used for the filtering electromagnetic interference; Connect first electric capacity between 5V power supply and the earth signal and absorb static discharge; One end of the 4th resistance connects the 6th pin 6 of CAN transponder chip; One end of second resistance connects the 7th pin 7 of CAN transponder chip; Two line ends of one end of common mode choke connect the two ends of the 4th resistance respectively, and two line ends of the other end of common mode choke connect the two ends of second resistance respectively.
Signal CAN_H and signal CAN_L enter the CAN transponder chip before through the electromagnetic interference on the common mode choke filtering bus.
A kind of anti-electromagnetic interference circuit arrangement based on the CAN bus comprises following device: one of CAN transponder chip, one of common mode choke, resistance five (resistance value is different with encapsulation) and six of electric capacity (capacitance is different).
A kind of remarkable advantage of the anti-electromagnetic interference circuit arrangement based on the CAN bus is to have solved the unreliability of CAN signal in communication.Carry out upgrading processing by antijamming capability, thereby reach desirable anti-electromagnetic interference effect each components and parts in the circuit arrangement; Common mode choke is actual to be a kind of low pass filter, and inductance value is again littler than larger volume, when inductance value is enough big, can produce effect to electric fast-pulse group.When reality is used, should be noted that the number of turn of adjusting choke, be together in series with two different number of turn chokes in case of necessity, take into account the requirement of high and low frequency.
Description of drawings
When considered in conjunction with the accompanying drawings, by the reference following detailed, can more completely understand the present invention better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present invention, constitute a part of the present invention, illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute to improper qualification of the present invention, wherein:
Fig. 1 is the CAN transceiver circuit figure of no anti-interference design;
Fig. 2 is the CAN transceiver circuit figure of band Anti-interference Design of the present invention.
Embodiment
Referring to figs. 1 through Fig. 2 embodiments of the invention are described.
Embodiment:
As shown in Figure 1, 2, CAN_H on the CAN bus and CAN_L signal are by carrying out data communication and command transfer between CAN transceiver and the microcontroller, the signal transmission rate of CAN is very big to the dynamic property and the Safety Effect of Full Vehicle System, for guaranteeing the reliability of CAN communication, designed the CAN transceiver circuit of anti-electromagnetic interference.
Technical scheme figure of the present invention sees Fig. 2 for details.Among Fig. 2, TLE6250G is a CAN transponder chip of company of Infineon, and the 5V power voltage supply supports to pass speed up to 1Mbps, and the CAN bus signals is by carrying out the information transmission between TLE6250G and the microcontroller; TLE6250G is that its working range is very broad :-40～150 ℃ at the CAN transceiver of automotive environment design; Except having, itself also have characteristics such as good anti-transition, anti-radio frequency, electrostatic protection and anti-electromagnetic interference as the general function of CAN transceiver.
Place filtering the 5th capacitor C 605 and the 6th capacitor C 606 in high the connection with CAN low signal end of CAN, the filtering electrostatic interference improves the reliability of CAN communication; Connect between 5V power supply and the earth signal and place second capacitor C, 602 absorption static discharges; One end of one end of first resistance R 601 and the 3rd resistance R 603 is connected the back and is connected with the end of the electricity first appearance C601, and first holds the other end ground connection of C601, and first capacitor C 601 strobes.
Signal CAN_H and CAN_L enter the CAN transponder chip before through the electromagnetic interference on the common mode choke L601 filtering bus.Two line ends of the end of common mode choke L601 connect the two ends of the 4th resistance R 604 respectively, and two line ends of the other end of common mode choke L601 connect the two ends of second resistance R 602 respectively.Common mode choke is a pith in the equipment such as Switching Power Supply, frequency converter, UPS (uninterruptible power system) power supply.Its operation principle is to flow through two around to opposite coil the time when operating current, produces two magnetic fields of cancelling out each other, and this moment, operating current mainly was subjected to the damping of little leakage inductance under coil Ohmic resistance and the negligible operating frequency; If when having interference signal to flow through coil, coil promptly presents high impedance, produces very strong damping, reaches the effect of decay interference signal; Common mode choke comes down to a bidirectional filter, common mode electromagnetic interference on the one hand can the filtered signal line, can inhibition itself outwards not send electromagnetic interference again on the other hand, avoid influencing the operate as normal of other electronic equipments under the same electromagnetic environment, thereby guarantee whole system reliability of operation on CAN communication and the car.
Common mode choke can transmit difference mode signal, and the difference mode signal that direct current and frequency are very low can pass through, and then presents very big impedance for high frequency common mode noise, has brought into play the effect of an impedor.Common mode choke is also referred to as common mode inductance, is the coil that symmetrical coiling direction is opposite on a closed magnet ring, the number of turn is identical.For desirable inductor models, when coil after intact, all magnetic fluxs all concentrate on coil in intracardiac.But generally loop coil can be around a full week, or coiling is not tight, can cause leakage of magnetic flux like this, utilizes the leakage inductance of common mode inductance to produce an amount of differential mode inductance, plays the inhibitory action to differential-mode current.Sometimes, also the very important person improves the differential mode inductance amount, to reach better filter effect for increasing the leakage inductance of common mode choke.
Common mode choke is a kind of low pass filter, and inductance value is again littler than larger volume, when inductance value is enough big, can produce effect to electric fast-pulse group.When reality is used, should be noted that the number of turn of adjusting choke, be together in series with two different number of turn chokes in case of necessity, take into account the requirement of high and low frequency.
Obviously, the many modifications and variations done based on aim of the present invention of those skilled in the art belong to protection scope of the present invention.
Terminological interpretation:
Common mode choke: being also referred to as common mode inductance, is the coil that symmetrical coiling direction is opposite on a closed magnet ring, the number of turn is identical.It comes down to a bidirectional filter, on the one hand can the filtered signal line on the common mode electromagnetic interference, can inhibition itself outwards not send electromagnetic interference again on the other hand, avoid influencing the operate as normal of other electronic equipments under the same electromagnetic environment.
Electromagnetic interference: two kinds of conducted interference and radiated interference are arranged.Conducted interference is meant by conducting medium another electric network is arrived in the coupling of the signal on the electric network (interference).Radiated interference is meant that interference source arrives another electric network to its signal coupling (interference) by the space.
As mentioned above, embodiments of the invention are explained, but as long as not breaking away from inventive point of the present invention and effect in fact can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within protection scope of the present invention.
Claims (5)
1. the anti-electromagnetic interference circuit arrangement based on the CAN bus is characterized in that first pin of transponder chip links to each other with data receiver (CAN_RXD) with the data sending terminal (CAN_TXD) of microcontroller respectively with the 4th pin; The 5th pin connects VCC_5V, promptly links to each other with the 5V power supply; Differential signal end CAN high with first resistance that is connected between CAN hangs down and the 3rd resistance in order to terminated line; Differential signal end CAN is high to be hanged down input with CAN and is connected the 5th electric capacity and the 6th electric capacity and is used for the filtering electromagnetic interference; Connect second electric capacity between 5V power supply and the earth signal and absorb static discharge; One end of the 4th resistance connects the 6th pin of CAN transponder chip; One end of second resistance connects the 7th pin of CAN transponder chip; Two line ends of one end of common mode choke connect the two ends of the 4th resistance respectively, and two line ends of the other end of common mode choke connect the two ends of second resistance respectively.
2. a kind of anti-electromagnetic interference circuit arrangement based on the CAN bus according to claim 1 is characterized in that having six of one of CAN transponder chip, one of common mode choke, five of resistance and electric capacity.
3. the anti-electromagnetic interference method based on the CAN bus is characterized in that the CAN bus signals is by carrying out the information transmission between CAN transponder chip TLE6250G and the microcontroller; TLE6250G is the CAN transceiver, except having the function as the CAN transceiver, itself also has electrostatic protection and anti-electromagnetic interference.
4. a kind of anti-electromagnetic interference method according to claim 3 based on the CAN bus, it is characterized in that increasing in the design circuit common mode choke, when operating current flows through two around to opposite coil the time, produce two magnetic fields of cancelling out each other, this moment, operating current mainly was subjected to the damping of little leakage inductance under coil Ohmic resistance and the negligible operating frequency; If when having interference signal to flow through coil, coil promptly presents high impedance, produces very strong damping, reaches the effect of decay interference signal; Common mode choke is a bidirectional filter, on the one hand can the filtered signal line on the common mode electromagnetic interference, can inhibition itself outwards not send electromagnetic interference again on the other hand, avoid influencing the operate as normal of other electronic equipments under the same electromagnetic environment.
5. a kind of anti-electromagnetic interference method according to claim 3 based on the CAN bus, it is characterized in that having disposed two resistance with value 120 Ω between low with CAN in that the two ends of CAN bus CAN is high, its effect is the bus matched impedance, can increase the stability and the antijamming capability of bus transfer, reduce the error rate in the transfer of data; High and the CAN low signal end placement filter capacitor at CAN, the filtering electrostatic interference improves the reliability of CAN communication.
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| CN2010105719732A CN102082612A (en) | 2010-11-29 | 2010-11-29 | Controller area network (CAN) bus-based anti-electromagnetic interference method and device |
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| CN2010105719732A CN102082612A (en) | 2010-11-29 | 2010-11-29 | Controller area network (CAN) bus-based anti-electromagnetic interference method and device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143911A (en) * | 2013-05-10 | 2014-11-12 | 弗里沃制造有限公司 | Improved choke circuit, and bus power supply incorporating same |
| CN104950881A (en) * | 2015-07-20 | 2015-09-30 | 桂凌云 | Data recorder, remote program updating system based on data recorder and application method of remote program updating system |
| CN107005499A (en) * | 2014-11-14 | 2017-08-01 | 株式会社自动网络技术研究所 | Communication system and communicator |
| CN107846255A (en) * | 2017-12-14 | 2018-03-27 | 安徽锐能科技有限公司 | Telecommunication circuit for battery management system |
| CN108123859A (en) * | 2016-11-30 | 2018-06-05 | 中国科学院沈阳自动化研究所 | Enhance the circuit system of the capable of resisting common-mode noise interference ability of CAN bus signal |
| CN109167606A (en) * | 2018-07-27 | 2019-01-08 | 安徽安为科技有限公司 | Means for anti-jamming built in a kind of locomotive information service terminal |
| CN109857021A (en) * | 2019-01-30 | 2019-06-07 | 烟台东方威思顿电气有限公司 | For the jamproof active shield system and method for M-bus bus |
| CN111431502A (en) * | 2020-03-31 | 2020-07-17 | 四川九八村信息科技有限公司 | System and method for electromagnetic compatibility prevention and control of analog signals |
| CN111625491A (en) * | 2020-06-29 | 2020-09-04 | 科华恒盛股份有限公司 | Multi-machine serial communication device and method |
| CN112698134A (en) * | 2020-12-21 | 2021-04-23 | 中国汽车工程研究院股份有限公司 | Whole vehicle electromagnetic self-compatibility risk diagnosis system and method based on global bus network |
| CN113239530A (en) * | 2021-04-28 | 2021-08-10 | 浙江威星智能仪表股份有限公司 | Magnetic ring selection method suitable for low-power communication equipment |
| CN114423270A (en) * | 2022-03-04 | 2022-04-29 | 长春捷翼汽车零部件有限公司 | Circuit, distribution box, new energy automobile and method for reducing electromagnetic interference |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143911A (en) * | 2013-05-10 | 2014-11-12 | 弗里沃制造有限公司 | Improved choke circuit, and bus power supply incorporating same |
| CN107005499A (en) * | 2014-11-14 | 2017-08-01 | 株式会社自动网络技术研究所 | Communication system and communicator |
| CN107005499B (en) * | 2014-11-14 | 2020-07-17 | 株式会社自动网络技术研究所 | Communication system |
| CN104950881A (en) * | 2015-07-20 | 2015-09-30 | 桂凌云 | Data recorder, remote program updating system based on data recorder and application method of remote program updating system |
| CN108123859A (en) * | 2016-11-30 | 2018-06-05 | 中国科学院沈阳自动化研究所 | Enhance the circuit system of the capable of resisting common-mode noise interference ability of CAN bus signal |
| CN107846255A (en) * | 2017-12-14 | 2018-03-27 | 安徽锐能科技有限公司 | Telecommunication circuit for battery management system |
| CN109167606A (en) * | 2018-07-27 | 2019-01-08 | 安徽安为科技有限公司 | Means for anti-jamming built in a kind of locomotive information service terminal |
| CN109857021A (en) * | 2019-01-30 | 2019-06-07 | 烟台东方威思顿电气有限公司 | For the jamproof active shield system and method for M-bus bus |
| CN111431502A (en) * | 2020-03-31 | 2020-07-17 | 四川九八村信息科技有限公司 | System and method for electromagnetic compatibility prevention and control of analog signals |
| CN111625491A (en) * | 2020-06-29 | 2020-09-04 | 科华恒盛股份有限公司 | Multi-machine serial communication device and method |
| CN112698134A (en) * | 2020-12-21 | 2021-04-23 | 中国汽车工程研究院股份有限公司 | Whole vehicle electromagnetic self-compatibility risk diagnosis system and method based on global bus network |
| CN112698134B (en) * | 2020-12-21 | 2024-02-27 | 中国汽车工程研究院股份有限公司 | Whole vehicle electromagnetic self-compatibility risk diagnosis system and method based on global bus network |
| CN113239530A (en) * | 2021-04-28 | 2021-08-10 | 浙江威星智能仪表股份有限公司 | Magnetic ring selection method suitable for low-power communication equipment |
| CN113239530B (en) * | 2021-04-28 | 2022-06-28 | 浙江威星智能仪表股份有限公司 | Magnetic ring selection method suitable for low-power communication equipment |
| CN114423270A (en) * | 2022-03-04 | 2022-04-29 | 长春捷翼汽车零部件有限公司 | Circuit, distribution box, new energy automobile and method for reducing electromagnetic interference |
| CN114423270B (en) * | 2022-03-04 | 2023-09-15 | 长春捷翼汽车科技股份有限公司 | Circuit for reducing electromagnetic interference, distribution box, new energy automobile and method |
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Application publication date: 20110601 |