CN206237433U - Strengthen the circuit system of the capable of resisting common-mode noise interference ability of CAN signal - Google Patents
Strengthen the circuit system of the capable of resisting common-mode noise interference ability of CAN signal Download PDFInfo
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- CN206237433U CN206237433U CN201621297281.2U CN201621297281U CN206237433U CN 206237433 U CN206237433 U CN 206237433U CN 201621297281 U CN201621297281 U CN 201621297281U CN 206237433 U CN206237433 U CN 206237433U
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- 239000000919 ceramic Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 17
- 238000004088 simulation Methods 0.000 description 5
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- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model is related to a kind of circuit system of the capable of resisting common-mode noise interference ability for strengthening CAN signal, including CAN transceiver circuit, the power supply of the CAN transceiver circuit is just accessing the positive pole of power supply, power supply ground accesses the ground of power supply, power supply is just and power supply ground between and connects filter capacitor；The CANH pins and CANL pins of CAN transceiver circuit positive concatenation are between common mode inductance, and CANH pins and CANL pins and connect bi-directional voltage stabilizing device, and CANH pins and the positive concatenation self- recoverage of CANL pins insure.The utility model is effectively improved CAN and communicates jamproof ability, can normal work in strong electromagnetic interference environment.
Description
Technical field
The utility model is related to underwater robot bus communication field, specifically a kind of enhancing CAN signal
The circuit system of capable of resisting common-mode noise interference ability.
Background technology
With the development of exploration of ocean resources technology, underwater robot technology has obtained very fast development, machine under domestic water
Device people technology also achieves very big achievement.The extension of underwater robot application field, it is desirable to which underwater robot function is increasingly
Many, underwater robot Portable device node also just increases therewith.Underwater test environment it is intricate, this requires underwater
Between people each equipment the real-time of data transfer will height, stability is eager to excel.
The current differential bus communications field mainly including CAN, RS485 etc., long transmission distance, signal due to differential signal
Stabilization, channel node it is many, it is real-time the advantages of, be widely used in industry-by-industry field.CAN has become the serial logical of ISO
Letter consensus standard, CAN communicates many advantages, such as with good real-time, reliability and security, substantially meets it
The requirement of current underwater robot communication bus data transfer, therefore it is widely used in the bus communication of underwater robot
In, it can couple together main frame with many from machine controller, sensor, executing agency etc., and data are transmitted by CAN
Order, read status information, to perform corresponding operating.Be converted into for the logical signal that CAN controller is exported available by CAN transceiver
In the differential signal of communication, transfer bus message information, it is also possible to read bus message information is then converted to logical signal passback
CAN controller.In modern control system, along with increasing for power component equipment, alternation equipment or motor etc. are in work
During, very strong electromagnetic interference signal, such as pulse signal, surge current, electromagnetic radiation etc., these interference signals can be produced
It is crosstalked into communication bus loop by circuit loop, if the design of certain single equipment CAN node circuits is improper in system, such as electricity
Deal with improperly to source, signal isolation ability and bus barrier ability go wrong etc., can all have influence on whole CAN and lead to
Communication network, when serious, or even causes the operation of whole communication network not smooth, loss of data or error of transmission etc..
CAN simulation waveforms under common mold noise interference as shown in Figure 4.Noise interference is more serious on CAN waveforms, especially
It occurs in that regular burr spike in low level, when some burr spike peak values are higher, can badly influence system total
Communication between built-in unit.In actual applications, some equipment being articulated in bus occur in that communication reports an error or packet loss is existing
As, by measurement, noise spectrum being contrasted, discovery is relevant with motor driving apparatus, is the common mold noise interference between bus apparatus.
Utility model content
In view of the shortcomings of the prior art, the utility model provides a kind of CAN telecommunication circuit, improves its communication stabilization
Property, anti-electromagnetic interference capability, and under water many CAN nodal communication networks of robot be in forceful electric power magnetic environment in be verified.
The technical scheme that the utility model is used to achieve the above object is：
A kind of circuit system of the capable of resisting common-mode noise interference ability for strengthening CAN signal, including CAN transceiver electricity
Road,
The power supply of the CAN transceiver circuit is just accessing the positive pole of power supply, and power supply ground accesses power supply
Ground, power supply is just and power supply ground between and connects filter capacitor；The CANH pins and CANL pins of CAN transceiver circuit are positive
Concatenation is between common mode inductance, and CANH pins and CANL pins and connects bi-directional voltage stabilizing device, and CANH pins and CANL pins are positive
Concatenation self- recoverage insurance.
The filter capacitor is ceramic filter capacitor, for filtering noise jamming in supply line.
The common mode inductance is the special common mode inductance of WE serial bus, for filtering the common-mode noise in bus.
The bi-directional voltage stabilizing device is used to suppress the differential voltage between CANH pins and CANL pins, improves bus differential
The identification voltage threshold of signal.
The self- recoverage is insured for carrying out overcurrent protection to CAN transceiver circuit.
The utility model has the advantages that and advantage：
1. the utility model improves communication by the common mode inductance and bi-directional voltage stabilizing device that are connected with CAN transceiver
Stability and anti-electromagnetic interference capability；
2. the utility model is insured by self- recoverage carries out overcurrent protection.
Brief description of the drawings
Fig. 1 is system architecture diagram of the present utility model；
Fig. 2 is system architecture circuit theory diagrams of the present utility model, wherein 1 be common mode inductance, 2 be bi-directional voltage stabilizing device, 3
For self- recoverage insures；
Fig. 3 is CAN simulation waveforms of the present utility model；
Fig. 4 is the CAN simulation waveforms under common mold noise interference.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to the utility model.
It is as shown in Figure 1 system architecture diagram of the present utility model.
The circuit system is mainly made up of 3 parts, respectively common mode inductance, bi-directional voltage stabilizing device and self- recoverage insurance；CAN
Bus coherent signal include CANH, CANL, power supply just with power supply ground, wherein power supply is just linked into powersupply system with power supply
Positive pole and ground, and two ends and connect ceramic filter capacitor；Common mode inductance employs the special common mode of bus of WE series in circuit
Inductance, has effectively filtered out the common-mode noise in bus, improves the noise margin of CAN；Bi-directional voltage stabilizing device is used to suppress
Differential voltage between CANH and CANL, improves the identification voltage threshold of bus differential signal；It is right that self- recoverage insurance is mainly used in
The protection of transceiver, from being damaged by big crossfire in adverse circumstances.
It is illustrated in figure 2 system architecture circuit theory diagrams of the present utility model.
CAN transceiver is powered by power supply VCC, is designated GND power supply, and two output ends of bus signals are individually identified as
CANH and CANL, between CANH and CANL and connects 120 Ω resistance；When in actual access system, bus both sides respectively and connect
120 ohm of build-out resistors, the matching impedance of actual bus is 60 Ω.
Common mode inductance 1, when CAN communication baud rate is 500Kbps, crosstalk common-mode noise is in 10K- in bus
Can all exist in the range of 50MHz, therefore the MnZn system core inductance of low-frequency high-impedance characteristic is chosen in type selecting.In view of inductance value
Higher, improvement Electro Magnetic Compatibility is stronger, but also signal waveform integrality can be had a certain impact simultaneously, after considering, choosing
Take 100mH Wu Erte sequence of communications network inductance.
Bi-directional voltage stabilizing device 2, it is contemplated that CAN transceiver differential signal end maximum receives pressure difference 4V, it is common when existing in bus
Pressure difference can exceed when mould is disturbed, between differential signal allows maximum differential pressure value, causes signal to receive error, therefore bi-directional voltage stabilizing device is selected
Type is the fast conducting TVS of 3.5V mark lining magnitudes of voltage.
Self- recoverage insurance 3, CANH, CANL according to CAN transceiver allow maximum short circuit current to choose respective model.Pass through
After these are improved, underwater robot can be met substantially under the forceful electric power magnetic environment such as motor controller, charger, carry out CAN
The requirement of bus networking.
It is illustrated in figure 3 CAN simulation waveforms of the present utility model.
CAN waveforms substantially standard of comparison, waveform quality is greatly improved.With do not add anti-interference process circuit phase
Than, CAN signal noise spike spike is reduced, on waveform under along steepening.Shown by practical application, this circuit system is effective
The twisted pair signal transmission quality for enhancing underwater robot CAN, antijamming capability makes it may apply to strong electromagnetic
In interference environment.
It is illustrated in figure 4 the CAN simulation waveforms under common mold noise interference.
Noise interference is more serious on CAN waveforms, and regular burr spike, some hairs are especially occurred in that in low level
When puncture tip peak-to-peak value is higher, the communication between equipment on system bus can be badly influenced.In actual applications, it is articulated to bus
On some equipment occur in that communication reports an error or packet loss phenomenon, by measurement, contrast noise spectrum, find and motor driving apparatus
It is relevant, it is the common mold noise interference between bus apparatus.
Claims (5)
1. a kind of circuit system of the capable of resisting common-mode noise interference ability for strengthening CAN signal, including CAN transceiver electricity
Road, it is characterised in that：
The power supply of the CAN transceiver circuit is just accessing the positive pole of power supply, and power supply ground accesses the ground of power supply,
Power supply is just and power supply ground between and connects filter capacitor；The positive concatenation of the CANH pins and CANL pins of CAN transceiver circuit
Between common mode inductance, and CANH pins and CANL pins and connect bi-directional voltage stabilizing device, CANH pins and the positive concatenation of CANL pins
Self- recoverage insures.
2. it is according to claim 1 enhancing CAN signal capable of resisting common-mode noise interference ability circuit system, its feature
It is：The filter capacitor is ceramic filter capacitor, for filtering noise jamming in supply line.
3. it is according to claim 1 enhancing CAN signal capable of resisting common-mode noise interference ability circuit system, its feature
It is：The common mode inductance is the special common mode inductance of WE serial bus, for filtering the common-mode noise in bus.
4. it is according to claim 1 enhancing CAN signal capable of resisting common-mode noise interference ability circuit system, its feature
It is：The bi-directional voltage stabilizing device is used to suppress the differential voltage between CANH pins and CANL pins, improves bus differential letter
Number identification voltage threshold.
5. it is according to claim 1 enhancing CAN signal capable of resisting common-mode noise interference ability circuit system, its feature
It is：The self- recoverage is insured for carrying out overcurrent protection to CAN transceiver circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621297281.2U CN206237433U (en) | 2016-11-30 | 2016-11-30 | Strengthen the circuit system of the capable of resisting common-mode noise interference ability of CAN signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621297281.2U CN206237433U (en) | 2016-11-30 | 2016-11-30 | Strengthen the circuit system of the capable of resisting common-mode noise interference ability of CAN signal |
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| Publication Number | Publication Date |
|---|---|
| CN206237433U true CN206237433U (en) | 2017-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621297281.2U Expired - Fee Related CN206237433U (en) | 2016-11-30 | 2016-11-30 | Strengthen the circuit system of the capable of resisting common-mode noise interference ability of CAN signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317134A (en) * | 2017-06-30 | 2017-11-03 | 上海青橙实业有限公司 | USB attachment means, USB fabric and terminal |
| CN108255098A (en) * | 2017-12-12 | 2018-07-06 | 贵州航天控制技术有限公司 | Servo mechanism feedback control circuit and CAN bus communication means based on bus |
| CN111781916A (en) * | 2020-07-01 | 2020-10-16 | 东风越野车有限公司 | Anti-electromagnetic interference integrated controller for whole vehicle |
-
2016
- 2016-11-30 CN CN201621297281.2U patent/CN206237433U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317134A (en) * | 2017-06-30 | 2017-11-03 | 上海青橙实业有限公司 | USB attachment means, USB fabric and terminal |
| CN108255098A (en) * | 2017-12-12 | 2018-07-06 | 贵州航天控制技术有限公司 | Servo mechanism feedback control circuit and CAN bus communication means based on bus |
| CN111781916A (en) * | 2020-07-01 | 2020-10-16 | 东风越野车有限公司 | Anti-electromagnetic interference integrated controller for whole vehicle |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170609 |