CN102983914A - Plastic optical fiber controller area network (CAN) bus converter - Google Patents
Plastic optical fiber controller area network (CAN) bus converter Download PDFInfo
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- CN102983914A CN102983914A CN2012103521779A CN201210352177A CN102983914A CN 102983914 A CN102983914 A CN 102983914A CN 2012103521779 A CN2012103521779 A CN 2012103521779A CN 201210352177 A CN201210352177 A CN 201210352177A CN 102983914 A CN102983914 A CN 102983914A
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Abstract
The invention relates to a plastic optical fiber controller area network (CAN) bus converter. The plastic optical fiber CAN bus converter is characterized by comprising a plastic optical fiber transceiver module, an amplifying circuit module and a drive circuit module, wherein the amplifying circuit module is connected with a receiving end of the plastic optical fiber transceiver module and is used to amplify electric signals, converted by photoelectricity, of the receiving end of the plastic optical fiber transceiver module, and the drive circuit module is connected with a sending end of the plastic optical fiber transceiver module and is used to drive the electric signals to enable the sending end of the plastic optical fiber transceiver module to send visible light signals. The plastic optical fiber CAN bus converter solves the problems that an existing CAN bus is interfered by electromagnetism and is high in cost, and realizes a whole optical transmission network.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of plastic fiber CANBUS transducer.
Background technology
CANBUS(Controller Area Net-work Bus as the ISO11898CAN standard), be field equipment connecting in the manufactory (transducer, actuator, controller etc.), towards broadcasting serial bus system, be used for auto industry by General Motors Overseas Corporation (GM) exploitation at first, after day by day appear at increasedly in the manufacturing automation industry.
But the communication port that existing CANBUS transducer has is mainly silica fiber or copper cable, the silica fiber decay is low, bandwidth is high, it is the main medium of long distance transmit, but be not suitable for repeatedly plugging, crooked, vibrations, the construction testing maintenance cost is high, be difficult to popularize at user side, its interface unit cost and mounting cost have increased the cost of system greatly.And copper cable is subjected to electromagnetic radiation larger, is subjected to the restriction of loss, bandwidth and noise to become bottleneck.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of plastic fiber CANBUS transducer.This plastic fiber CANBUS transducer can utilize plastic fiber transmission CANBUS bus data.
The embodiment of the invention is to realize like this, a kind of plastic fiber CANBUS transducer, described plastic fiber CANBUS transducer, include a plastic fiber transceiver module, an amplifying circuit module and a drive circuit module, wherein the amplifying circuit module is connected with the receiving terminal of plastic fiber transceiver module, this module is used for the receiving terminal of plastic fiber transceiver module is amplified through the signal of telecommunication after the opto-electronic conversion, drive circuit module is connected with the transmitting terminal of plastic fiber transceiver module, and this module is used for driving the signal of telecommunication so that the transmitting terminal of plastic fiber transceiver module sends the visible light light signal.
The invention has the advantages that and realized a kind of plastic fiber CANBUS transducer, can utilize plastic fiber transmission CANBUS bus data, large fibre core makes its connection become easy, easily aims at, and installation cost is very low; Numerical aperture is large, and is high with the coupling efficiency of light source and receiving device; Material is cheap, and low cost of manufacture is of many uses, and the copper cash transmission medium that has solved existing Access Network is subject to electromagnetic interference, problem that cost is high.
Description of drawings
Fig. 1 is the structural principle block diagram of plastic fiber CANBUS transducer of the present invention;
Fig. 2 is the electrical schematic diagram of plastic fiber CANBUS transducer of the present invention.
Fig. 3 is the circuit diagram of plastic fiber CANBUS transducer of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical solution of the present invention is elaborated.
CANBUS(Controller Area Net-work Bus as ISO11898 CAN standard), be field equipment connecting in the manufactory (transducer, actuator, controller etc.), towards broadcasting serial bus system, it is one of most widely used fieldbus in the world, be used for auto industry by General Motors Overseas Corporation (GM) exploitation at first, CANBUS is designed as communication between the microcontroller in the automotive environment, exchange message between vehicle-mounted each electronic-controlled installation ECU forms the Vehicle Electronic Control network.It is a kind of serial communication bus of multiple host pattern, and the Basic Design code requirement has higher bit rate, high noise immunity, and can detect any mistake of generation.When signal transmission distance reaches 10Km, still can provide the message transmission rate up to 5Kbps.Because the CAN serial communication bus has these characteristics, what it was very natural is subject to extensive use in automobile, manufacturing industry and aircraft industry.
But the communication port that existing CANBUS transducer has is mainly silica fiber or copper cable, the silica fiber decay is low, bandwidth is high, it is the main medium of long distance transmit, but be not suitable for repeatedly plugging, crooked, vibrations, the construction testing maintenance cost is high, be difficult to popularize at user side, its interface unit cost and mounting cost have increased the cost of system greatly.And copper cable is subjected to electromagnetic radiation larger, is subjected to the restriction of loss, bandwidth and noise to become bottleneck.
Therefore, we consider to adopt plastic fiber (POF) as the transmission medium of communication network, plastic fiber is information industry one of the material that has theoretical significance and application prospect over nearly more than 20 years in the polymer science field, large fibre core makes its connection become easy, easily aim at, installation cost is very low; Numerical aperture is large, and is high with the coupling efficiency of light source and receiving device; Material is cheap, and low cost of manufacture is of many uses.
Plastic fiber (POF) is compared with copper cable, has the following advantages:
1. without electrical interference: POF exempts from electromagnetic interference, crosstalks and noise;
2. electricity isolation: the POF optical network apparatus is the electricity isolation;
3. saving space: to when young 50%, the shared space of therefore connecting up is little than TP twisted-pair feeder for the diameter of POF optical cable;
4. lightweight: POF is lighter at least 4 times than category-5 cable, therefore can save the shipment cost;
5. connect fast: can cut off at an easy rate and be connected;
6. reliability and durability: POF can stand larger vibrations;
7. install easily: because need not the inhibition of crosstalk and noise, therefore be easy to install;
8. it is simple to be communicated with test: only need do the test of link insertion loss;
9. have confidentiality and fail safe: the POF optical cable is difficult to be ravesdropping;
10. zero radiation: POF does not have electromagnetic radiation to produce;
11. service is good: the three-in-one service of Triply that is particularly suitable for video, data and voice.
We have developed a plastic fiber CANBUS transducer based on this.Its principle assumption diagram is as shown in fig. 1:
This plastic fiber CANBUS transducer, include a plastic fiber transceiver module, an amplifying circuit module and a drive circuit module, the receiving terminal of plastic fiber transceiver module wherein, the output of CANBUS transducer is connected with the amplifying circuit module, this module is used for the receiving terminal of plastic fiber transceiver module is amplified through the signal of telecommunication after the opto-electronic conversion, the transmitting terminal of plastic fiber transceiver module, the input of CANBUS transducer is connected with drive circuit module, and this module is used for driving the signal of telecommunication so that the transmitting terminal of plastic fiber transceiver module sends the visible light light signal.
The electrical schematic diagram that it is concrete and circuit diagram such as Fig. 2, shown in Figure 3:
Drive circuit module is a high speed large driven current density pipe, also it can be considered as one " with door ", drive the RCLED in the plastic fiber transceiver module, make it to send the visible light light signal corresponding with input signal, its specific implementation is TI SN75451 chip, and socket is CON-12P.
The amplifying circuit module adds the inverter chip CD4007 of National Semiconductor chip by two complementary pairs and a high sensitivity is amplified enhancement mode fet of triode PANJIT 2N7002(, also be a high-speed pulse amplifier) form, be used for the signal of telecommunication after the receiving terminal opto-electronic conversion of plastic fiber transceiver module is amplified to the needed level of CANBUS bus.
Plastic fiber transceiver module specific implementation is the 650nm analog optical fiber transceiver FC300T-111 of Firecomms company, and this transceiver module comprises a receiving terminal and a transmitting terminal.Receiving terminal receives the plastic fiber light signal, and is converted into the signal of telecommunication, and outputs to the amplifying circuit module.Transmitting terminal receives the signal of telecommunication that drive circuit module sends, and is converted into the plastic fiber light signal, sends to plastic fiber.
The CANBUS system connects industrial equipment (such as limit switch, photoelectric sensor, pipeline valve, motor starter, process sensor, frequency converter, display panel, PLC and PCI work station etc.) by corresponding CAN interface and consists of low-cost network.Directly connection not only provides the device level method for diagnosing faults, and has improved the interchangeability of communication efficiency and equipment.When the CANBUS message transmission rate was 1Mbit/s, transmission ultimate range was 40m, and speed is that 5kbps is that transmission ultimate range is 10km, basic website several 64.
The CANBUS data link layer protocol adopts equality formula (Peer to peer) communication mode, even main frame breaks down, system's remainder still can move (performance is subjected to certain influence certainly).When a station state changes, but its broadcast transmission information is to all websites.The communication of CANBUS is undertaken by message, and message frame has 4 types: Frame, remote frame, make mistakes frame and overload frame.The data fields of CANBUS frame is shorter, and less than 8B, data length provides in controlling filed.Short frame sends and has reduced on the one hand the message error rate, also is conducive to reduce simultaneously the transmission lag time of other websites.The affirmation that frame sends is finished jointly by dispatching station and receiving station, the ACK field that dispatching station sends comprises two " free time " position (recessive bit), receiving station sends one " occupying " position (dominant bit) immediately after receiving correct CRC field, give the answer of an affirmation of dispatching station.CANBUS also provides very strong error processing capacity, can distinguish bit-errors, fill-error, crc error, form error and reply mistake etc.CANBUS uses a kind of damage referee method towards bit-type and solves the collision problem that the media multiple access is brought.Its arbitrated procedure is: when bus was idle, circuit showed as " leaving unused " level (recessive level), and this moment, any station all can send message.The frame start field that dispatching station sends produces " occupying " level (dominant level), and sign sends beginning.All stations are come synchronously with the initial forward position of the frame that at first begins dispatching station.If there are a plurality of stations to send simultaneously, compare by turn in the arbitration field that sends so.The arbitration field comprises identifier ID (standard is llbit), corresponding its priority.Each stands in and sends when arbitrating the field, will send position and line level relatively, if identical then transmission; Withdraw from arbitration if difference learns then that priority is low, no longer send.System response time and website number are irrelevant, only depend on the priority of arrangement.Can find out that this media interviews control mode can cause data and channel width impaired unlike the CSMA/CDCA agreement of Ethernet.
The present invention be one with the plastic fiber CANBUS transducer of plastic fiber Ethernet interface, the communication port that existing CANBUS transducer has is mainly silica fiber or copper cable, the silica fiber decay is low, bandwidth is high, it is the main medium of long distance transmit, but be not suitable for repeatedly plugging, crooked, vibrations, the construction testing maintenance cost is high, is difficult to popularize at user side, and its interface unit cost and mounting cost have increased the cost of system greatly.And copper cable is subjected to electromagnetic radiation larger, is subjected to the restriction of loss, bandwidth and noise to become bottleneck.
The invention has the advantages that and can utilize plastic fiber transmission CANBUS bus data, large fibre core makes its connection become easy, easily aims at, and installation cost is very low; Numerical aperture is large, and is high with the coupling efficiency of light source and receiving device; Material is cheap, and low cost of manufacture is of many uses, and the copper cash transmission medium that has solved existing Access Network is subject to electromagnetic interference, problem that cost is high.
Above content is the further description of the present invention being done in conjunction with concrete optimal technical scheme, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (2)
1. plastic fiber CANBUS transducer, it is characterized in that, described plastic fiber CANBUS transducer, include a plastic fiber transceiver module, an amplifying circuit module and a drive circuit module, wherein the amplifying circuit module is connected with the receiving terminal of plastic fiber transceiver module, this module is used for the receiving terminal of plastic fiber transceiver module is amplified through the signal of telecommunication after the opto-electronic conversion, drive circuit module is connected with the transmitting terminal of plastic fiber transceiver module, and this module is used for driving the signal of telecommunication so that the transmitting terminal of plastic fiber transceiver module sends the visible light light signal.
2. plastic fiber CANBUS transducer as claimed in claim 1, it is characterized in that, described drive circuit module is TI SN75451 chip, the amplifying circuit module is amplified triode PANJIT 2N7002 and is formed for added the inverter chip CD4007 of National Semiconductor chip and a high sensitivity by two complementary pairs, and the plastic fiber transceiver module is the 650nm analog optical fiber transceiver FC300T-111 of Firecomms company.
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| CN2012103521779A CN102983914A (en) | 2012-09-21 | 2012-09-21 | Plastic optical fiber controller area network (CAN) bus converter |
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| CN2012103521779A CN102983914A (en) | 2012-09-21 | 2012-09-21 | Plastic optical fiber controller area network (CAN) bus converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991195A (en) * | 2016-03-03 | 2016-10-05 | 合肥工业大学 | Fiber-to-CAN circuit applied to plastic optical fiber network |
| CN111487895A (en) * | 2019-01-29 | 2020-08-04 | 海天塑机集团有限公司 | Communication system of displacement sensor and controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2661507Y (en) * | 2003-12-16 | 2004-12-08 | 中国科学院电工研究所 | Vehicle mounted CAN bus fiber concentrator |
| CN201398193Y (en) * | 2009-03-20 | 2010-02-03 | 东莞市一普实业有限公司 | SSF transmission/reception integrated optical module and plastic optical fiber communication system |
| CN101677280A (en) * | 2008-09-17 | 2010-03-24 | 中国科学院自动化研究所 | Optical fiber field bus communication system |
-
2012
- 2012-09-21 CN CN2012103521779A patent/CN102983914A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2661507Y (en) * | 2003-12-16 | 2004-12-08 | 中国科学院电工研究所 | Vehicle mounted CAN bus fiber concentrator |
| CN101677280A (en) * | 2008-09-17 | 2010-03-24 | 中国科学院自动化研究所 | Optical fiber field bus communication system |
| CN201398193Y (en) * | 2009-03-20 | 2010-02-03 | 东莞市一普实业有限公司 | SSF transmission/reception integrated optical module and plastic optical fiber communication system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991195A (en) * | 2016-03-03 | 2016-10-05 | 合肥工业大学 | Fiber-to-CAN circuit applied to plastic optical fiber network |
| CN111487895A (en) * | 2019-01-29 | 2020-08-04 | 海天塑机集团有限公司 | Communication system of displacement sensor and controller |
| CN111487895B (en) * | 2019-01-29 | 2023-05-05 | 海天塑机集团有限公司 | Communication system of displacement sensor and controller |
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Application publication date: 20130320 |