WO2020109315A1 - Dispositif de limitation en mode commun pour un bus d'un système de bus et procédé de limitation de bruitage en mode commun dans un système de bus - Google Patents

Dispositif de limitation en mode commun pour un bus d'un système de bus et procédé de limitation de bruitage en mode commun dans un système de bus Download PDF

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Publication number
WO2020109315A1
WO2020109315A1 PCT/EP2019/082605 EP2019082605W WO2020109315A1 WO 2020109315 A1 WO2020109315 A1 WO 2020109315A1 EP 2019082605 W EP2019082605 W EP 2019082605W WO 2020109315 A1 WO2020109315 A1 WO 2020109315A1
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WO
WIPO (PCT)
Prior art keywords
bus
common mode
limiting device
current mirror
bus system
Prior art date
Application number
PCT/EP2019/082605
Other languages
German (de)
English (en)
Inventor
Simon Weissenmayer
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2020109315A1 publication Critical patent/WO2020109315A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
    • H04L25/027—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling specifically for telegraph signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
    • H04L25/085—Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN

Definitions

  • the present invention relates to a common mode limiting device for a bus of a bus system, which is in particular a serial bus system, and a method for limiting common mode interference, in particular
  • Bus systems which use data transmission protocols for the transmission of data are common in many areas of technology today.
  • a bus system is increasingly used between sensors and control devices, for example in vehicles, in which data is transmitted as messages in the ISO11898-l: 2015 standard as a CAN protocol specification with CAN FD. The messages are between the
  • CAN FD is currently in the first step mostly with a data bit rate of 2Mbi1 / s for the transmission of bits of the data field and with an arbitration bit rate of 500kbit / s for the
  • a common mode limiting device for a bus of a bus system and a method for limiting common mode interference in a bus system which solve the aforementioned problems.
  • a common mode limiting device for a bus of a bus system and a method for limiting common mode interference in a bus system are to be provided, in which capacitive couplings do not result in a loss of signal on the bus.
  • Common mode limiting device has at least one current mirror which is connected between a first and a second bus line of the bus, the current mirror having a first transistor and a second transistor, the control connections of which are connected to one another, and at least two connections of the first and second transistors to one another and to ground are connected.
  • the described common mode limiting device also enables a limitation of by limiting the common mode interference
  • Participant stations of the bus system are transmitted. Interfering common mode voltages in a bus system therefore do not lead to a reduction in the bit rate in the bus system. As a result, the data rate in the bus system can be increased without the communication due to
  • the current mirror is between the
  • Bus lines connected to equalize the currents from the
  • the common mode limiting device also has a zener diode, which is connected between the second bus line and the second transistor of the current mirror, the first transistor of the current mirror being connected directly to the first bus line.
  • the common mode limiting device also has a zener diode which is connected between a connection of the first transistor and a connection of the second transistor, and a diode which is connected between the zener diode and ground.
  • the common mode limiting device also has a resistor which is connected between the connection of the first and second transistor and ground. It is possible here for at least one current mirror to be connected to ground via the resistor, and for at least one current mirror to be connected to ground without the resistor.
  • a first Zener diode can be connected between the second bus line and the at least one first current mirror, and a second Zener diode can be connected to the at least one second current mirror, the second Zener diode having a breakdown voltage that is greater than that
  • Breakdown voltage of the first zener diode Breakdown voltage of the first zener diode.
  • the at least one current mirror is designed to derive voltages greater than approximately 58 V and voltages less than approximately -58 V to ground.
  • the common mode limiting device has at least one current mirror, which is used to limit positive
  • Common mode voltages is configured, and at least one current mirror, which is designed to limit negative common mode voltages.
  • the common-mode limiting device also has a first suppressor diode, which is connected between a first bus line of the bus and ground, and a second suppressor diode, which is connected between a second bus line of the bus and ground, each of the first and second suppressor diodes for deriving Voltages greater than about 58 V and from voltages less than about -58 V to the ground.
  • the common mode limiting device described above can be part of a subscriber station for a bus system, which also has a transmission and Receiving device for sending messages on a bus of the
  • the common mode limiting device can be integrated in the transmitting and receiving device.
  • the subscriber station may also have one
  • Communication control device for generating and sending messages to the transmitting and receiving device and for receiving and evaluating messages from the sending and receiving device
  • Communication control device is configured to generate the messages such that in the first communication phase for sending the
  • Messages on the bus between the subscriber stations of the bus system is negotiated, which of the subscriber stations in the subsequent second communication phase at least temporarily has exclusive, collision-free access to the bus of the bus system.
  • At least two subscriber stations can be part of a bus system which also has a bus, so that the at least two subscriber stations are connected to one another via the bus in such a way that they can communicate with one another in series.
  • the bus system has at least one previously described common mode limiting device for at least one bus line of the bus.
  • At least one of the at least two subscriber stations may be a previously described subscriber station.
  • the aforementioned object is also achieved by a method for limiting common mode interference in a bus system according to claim 14.
  • the method has the steps: Sending a message in the bus system via a bus, between whose bus lines a common-mode limiting device is connected, which has at least one current mirror, which is connected between the first and second bus lines of the bus, the current mirror comprising a first transistor and a has second transistor whose
  • Control connections are connected to one another, and at least two connections of the first and second transistors to one another and to ground are connected, and deriving electrical currents from the bus lines with the common mode limiting device to avoid common mode interference on the
  • FIG. 1 shows a simplified block diagram of a bus system according to a first exemplary embodiment
  • FIG. 2 shows an electrical circuit of a common mode limiting device for the bus system according to the first exemplary embodiment
  • FIG. 3 shows an electrical circuit of a common mode limiting device for the bus system according to a second exemplary embodiment
  • FIG. 5 shows an electrical circuit of a common mode limiting device for a bus system according to a fourth exemplary embodiment.
  • bus system 1 shows an example of a bus system 1, which is configured in particular fundamentally for a classic CAN bus system, a CAN FD bus system or CAN FD successor bus systems, as described below.
  • the bus system 1 can be used in a vehicle, in particular a motor vehicle, an aircraft, etc., or in a hospital, etc.
  • the bus system 1 has a multiplicity of subscriber stations 10, 20, 30, each of which is connected to a bus 40 with a first bus line 41 and a second bus line 42.
  • the bus 40 is terminated at both ends with line terminations 50.
  • line terminations 50 One of them is
  • Line terminations 50 are provided at subscriber station 30.
  • Subscriber stations 10, 20 are each connected to the bus 40 with a stub line. There is one at each of the subscriber stations 10, 20, 30
  • Common mode limiting device 60 is provided.
  • the bus lines 41, 42 can also be called CAN_H and CAN_L and are used, using a TX signal in the transmit state, for electrical signal transmission after coupling in of the dominant levels or states 401 or generation or active driving of recessive levels or states 402.
  • the states 401, 402 are only shown very schematically in the subscriber station 20.
  • the states 401, 402 correspond to the states of a TX signal from a transmitting subscriber station 10, 20, 30.
  • the signals from the subscriber stations 10, 20, 30 become an RX signal receive.
  • Messages 45, 46 in the form of the signals CAN_H and CAN_L can be transmitted serially between the individual subscriber stations 10, 20, 30 via the bus 40.
  • the subscriber stations 10, 20, 30 are, for example, control devices, sensors, display devices, etc. of a motor vehicle.
  • subscriber station 10 has one
  • the subscriber station 20 has one Communication control device 21 and a transceiver 22, in which the common mode limiting device 60 is installed.
  • Subscriber station 30 has a communication control device 31, a transceiver 32, the line termination 50 and one
  • Common mode limiting device 60 In the subscriber station 30, the line termination 50 and the common mode limiting device 60 form a unit or have an integrated structure.
  • the transceivers 12, 22, 32 of the subscriber stations 10, 20, 30 are each connected directly to the bus 40, even if this is not illustrated in FIG. 1.
  • the transmitting / receiving devices 12, 22 are each connected to the bus 40 with a spur line.
  • the communication control devices 11, 21, 31 each serve to control communication of the respective subscriber station 10, 20, 30 via the bus 40 with one or more other subscriber stations of the subscriber stations 10, 20, 30, which are connected to the bus 40.
  • the communication control devices 11, 21, 31 each serve to control communication of the respective subscriber station 10, 20, 30 via the bus 40 with one or more other subscriber stations of the subscriber stations 10, 20, 30, which are connected to the bus 40.
  • Communication control devices 11, 21, 31 each have a transmission signal, which is also called a TX signal, for the messages 45, 46 to be transmitted and send the TX signal to the associated transmission and reception device 12, 22, 32.
  • the respective communication control device can 11, 21, 31 a receive signal, which is also called an RX signal, for the message 45, 46 received by the bus 40 from the associated transmit and
  • the communication control devices 11, 21, 31 can generate the messages 45, 46 in such a way that in a first communication phase for sending the messages 45, 46 on the bus 40 between the subscriber stations 10, 20, 30, which of the subscriber stations 10, 20 is negotiated , 30 in the
  • subsequent second communication phase at least temporarily has exclusive, collision-free access to bus 40 of bus system 1.
  • the useful data of the messages 45, 46 can be sent on the bus 40.
  • the communication control device 11 can be designed like a conventional Classical CAN or CAN FD controller.
  • the Communication control device 11 creates and reads first messages 45, which are, for example, Classical CAN messages or CAN FD messages.
  • the Classical CAN messages are constructed in accordance with the Classical basic format, in which a number of up to 8 data bytes can be included in the first message 45.
  • the CAN FD message is structured according to the CAN FD format, in which a number of up to 64 data bytes can be included, which in addition with a significantly faster and thus higher
  • the transceiver 12 can be designed like a conventional CAN transceiver and / or CAN FD transceiver.
  • Each of the communication control devices 21, 31 creates and reads first messages 45, as described above, or optionally second messages 46.
  • the second messages 46 are constructed on the basis of a format which is referred to as the CAN FD successor format and, for example, data in the data phase can transmit a higher bit rate than CAN FD.
  • Each of the transmitting / receiving devices 22, 32 can be designed as a CAN transceiver, which, as required, provides one of the previously described first messages 45 or a second message 46 in accordance with the CAN FD successor format for the associated communication control device 21, 31 or receives it from the latter can.
  • FIG. 2 shows an electrical circuit of the common mode limiting device 60 for the bus lines 41, 42 of the bus 40 according to the present
  • Common mode limiting device 60 suppressor diodes 61, 62, a zener diode 63 and a current mirror 64.
  • Current mirror 64 has first and second transistors 641, 642.
  • MOSFET metal oxide semiconductor field effect transistor
  • metal oxide semiconductor field effect transistor metal oxide semiconductor field effect transistor
  • the current mirror 64 can alternatively be designed as a cascode current mirror or as a Wilson current mirror, or another variant. In particular, a variant with three bipolar transistors is possible for the current mirror 64.
  • control connections of the transistors 641, 642 are connected to one another.
  • the control terminals of transistors 641, 642 are also connected to another terminal of transistor 642.
  • the control connection of the transistors 641, 642 is the gate connection in a MISFET.
  • the other connection of transistor 642 is, for example, the drain connection.
  • two other connections of the transistors 641, 642 are connected to one another and to ground 43. In the case of a MISFET, these other connections of the transistors 641, 642 are, for example, the source connections.
  • the suppressor diode 61 is connected between the bus line 41 and ground 43.
  • the suppressor diode 62 is connected between the bus line 42 and ground 43.
  • the Zener diode 63 is connected between the bus line 42 and the current mirror 64.
  • the cathode of the Zener diode 63 is connected to the bus line 42.
  • the anode of the zener diode 63 is connected to the transistor 642 of the current mirror 64. 2, the anode of zener diode 63 is connected to the drain terminal of transistor 642.
  • a current IH from CAN_H and a current I I from CAN_L flow into the current mirror 64 Common mode limiting device 60.
  • the current mirror 64 is also connected to ground 43 at the connection of the two transistors 641, 642, as already mentioned with reference to the transistors 641, 642.
  • the current mirror 64 is designed in such a way that the current mirror 64 is only active in voltage ranges in which a common mode disturbance, which is noticeable as a common mode voltage Us, can be excluded by ground offset. It is taken into account that low common-mode disturbances can also be caused by mass offset, in which the
  • the common-mode limiting device 60 is preferably used at those points of the bus system 1 at which common-mode interference is coupled into the bus system 1, so that the interference does not first spread and can possibly be converted into push-pull interference.
  • Common mode limiting device 60 can be installed next to the transceiver 12 on the circuit board of the subscriber station 10.
  • the common mode limiting device 60 can be installed in the transceiver 12, as shown for the transceiver 22 of the subscriber station 20 in FIG. 1.
  • the assembly variants mentioned for the common-mode limiting device 60 can be selected as desired at the different locations of the bus system 1.
  • the common mode limiting device 60 is in
  • Control units can be installed or attached to the control units, which only loop through the CAN lines 41, 42 but do not actively participate in the data transmission.
  • the common mode disturbance in particular
  • the common-mode limiting device 60 has the effect that the currents with respect to ground 43 are of the same size regardless of the differential voltage on both lines 41, 42.
  • FIG. 3 shows an electrical circuit of a common mode limiting device 60A for the bus lines 41, 42 of the bus 40 according to a second
  • the common mode limiting device 60A can be used instead of at least one common mode limiting device 60 for the bus lines 41, 42 of the bus 40 from FIG. 1.
  • the bus system 1 can thus have at least one common mode limiting device 60 and / or at least one common mode limiting device 60A.
  • the common mode limiting device 60A additionally has a resistor 65 which is connected between ground 43 and the current mirror 64.
  • the resistor 65 is therefore connected in series with the current mirror 64.
  • the current mirror 64 with resistor 65 reduces small common mode couplings and the current mirror 64 without resistor 65 reduces the common mode couplings which are so large that they cannot be compensated for by current mirror 64 with resistor 65.
  • the zener diode 63 for the current mirror 64 with resistor 65 has a breakdown voltage that is greater than that
  • Breakdown voltage of the Zener diode 63 for the current mirror 64 without the resistor 65 This can cause small
  • FIG. 4 shows an electrical circuit of a common mode limiting device 60B for the bus lines 41, 42 of the bus 40 according to a third
  • the common mode limiting device 60B can be used instead of at least one common mode limiting device 60 for the bus lines 41, 42 of the bus 40 from FIG. 1.
  • the bus system 1 can thus have at least one common mode limiting device 60 and / or at least one common mode limiting device 60A and / or at least one
  • the common mode limiting device 60B is different from that
  • no suppressor diodes 61, 62 no suppressor diodes 61, 62.
  • the current mirror 64 is designed to be particularly powerful. As a result, the current mirror 64 takes over the function of the suppressor diodes 61, 62.
  • the additional protective circuitry provided by the suppressor diodes 61, 62 can thus be dispensed with.
  • the common mode limiting device 60B has fewer components than the common mode limiting devices 60, 60B.
  • 5 shows an electrical circuit of a common mode limiting device 60C for the bus lines 41, 42 of the bus 40 according to a fourth
  • the common mode limiting device 60C can be used instead of at least one common mode limiting device 60 for the bus lines 41, 42 of the bus 40 from FIG. 1.
  • the bus system 1 can thus have at least one common mode limiting device 60 and / or at least one common mode limiting device 60A and / or at least one
  • the common mode limiting device 60C has two common mode limiting units 640, 6400.
  • the first common mode limiting unit 640 more precisely its current mirror 64, is used to limit positive common mode voltages Us.
  • the second common mode limiting unit 6400, more precisely its current mirror 64, serves to limit negative common mode voltages Us.
  • a diode 66 is connected between ground 43 and the connection of the current mirror 64 to ground 43. This connection is formed in the case of MOSFETs as transistors 641, 642 by the source connections.
  • the cathode of diode 66 is connected to ground 43.
  • the anode of the diode 63 is connected to the current mirror 64.
  • a zener diode 630 is connected between the current mirror 64A and the connection to ground 43.
  • a diode 660 is connected between the connection of the current mirror 64A to ground 43 and ground 43.
  • this connection is formed by the gate connections of the transistors 6410, 6420 and the drain connection of the second transistor 6420.
  • the cathode of the diode 660 is connected to the cathode of the zener diode 630.
  • the anode of zener diode 630 is connected to current mirror 64A.
  • the anode of diode 660 is connected to ground 430.
  • the second zener diode 630 can have a breakdown voltage that is greater than the breakdown voltage of the first zener diode 63.
  • Subscriber stations 10, 20, 30, the transceiver 12, 22, 32, the bus system 1 and the method carried out therein can be used individually or in all possible combinations.
  • all features of the exemplary embodiments described above and / or their modifications can be combined as desired.
  • the following modifications are particularly conceivable.
  • Each of the common mode limiting devices 60, 60A, 60B may have more than one current mirror.
  • the common mode limiting device 60C may have more than the two current mirrors, for example a further current mirror with a resistor 65.
  • common mode limiting devices 60, 60A, 60B, 60C are described in relation to the CAN bus system, the invention is not limited to this.
  • the common mode limiting devices 60, 60A, 60B, 60C of the exemplary embodiments and their modifications can be used in all branched bus systems, that is to say not only in CAN and CAN FD networks.
  • USB Universal Serial Bus
  • LIN Local Interconnection network
  • SPI Serial Peripheral Interface
  • the common mode limiting devices 60, 60A, 60B, 60C can be used in a parallel bus system, such as one
  • bus system 1 Internal control unit communication, especially in a microcontroller.
  • the previously described bus system 1 according to the exemplary embodiments is described using a bus system based on the CAN protocol.
  • the bus system 1 according to the exemplary embodiments can also be another type of communication network, in which data can be transmitted serially at two different bit rates. It is advantageous, but not inevitable, that an exclusive, collision-free access of one at least for certain periods of time in the bus system 1
  • Subscriber station 10, 20, 30 is guaranteed on a common channel.
  • Bus system 1 of the exemplary embodiments is arbitrary. It is possible for one or more of the subscriber stations 10 or 20 or 30 to be present in the bus system 1.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Small-Scale Networks (AREA)

Abstract

Dispositif de limitation en mode commun (60, 60A, 60B, 60C) pour un bus (40) d'un système de bus (1) et procédé de limitation de bruitage en mode commun dans un système de bus (1). Le dispositif de limitation en mode commun (60, 60A, 60B, 60C) comporte au moins un miroir de courant (64, 64A) monté entre une première et une deuxième ligne de bus (41, 42) du bus (40) et comportant un premier transistor (641, 6410) et un deuxième transistor (642, 6420), dont les bornes de commande sont reliées les une aux autres. Au moins deux bornes du premier et du deuxième transistor (641, 6410, 642, 6420) sont reliées les unes aux autres et à la masse (43).
PCT/EP2019/082605 2018-11-28 2019-11-26 Dispositif de limitation en mode commun pour un bus d'un système de bus et procédé de limitation de bruitage en mode commun dans un système de bus WO2020109315A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018220502.7A DE102018220502A1 (de) 2018-11-28 2018-11-28 Gleichtaktbegrenzungsvorrichtung für einen Bus eines Bussystems und Verfahren zum Begrenzen von Gleichtaktstörungen in einem Bussystem
DE102018220502.7 2018-11-28

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WO2020109315A1 true WO2020109315A1 (fr) 2020-06-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10251473B3 (de) * 2002-11-05 2004-06-17 Siemens Ag Schutzschaltung zum Schutz gegen Überspannung für einen CAN-Bus-Transceiver
DE102005028211A1 (de) * 2005-06-17 2006-12-28 Infineon Technologies Ag Schaltungsanordnung zum Verbinden eines ersten Schaltungsknotens mit einem zweiten Schaltungsknoten und zum Schutz des ersten Schaltungsknotens vor einer Überspannung
DE102013222786A1 (de) * 2013-11-08 2015-05-13 Robert Bosch Gmbh Teilnehmerstation für ein Bussystem und Verfahren zur Reduzierung von leitungsgebundenen Emissionen in einem Bussystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10251473B3 (de) * 2002-11-05 2004-06-17 Siemens Ag Schutzschaltung zum Schutz gegen Überspannung für einen CAN-Bus-Transceiver
DE102005028211A1 (de) * 2005-06-17 2006-12-28 Infineon Technologies Ag Schaltungsanordnung zum Verbinden eines ersten Schaltungsknotens mit einem zweiten Schaltungsknoten und zum Schutz des ersten Schaltungsknotens vor einer Überspannung
DE102013222786A1 (de) * 2013-11-08 2015-05-13 Robert Bosch Gmbh Teilnehmerstation für ein Bussystem und Verfahren zur Reduzierung von leitungsgebundenen Emissionen in einem Bussystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEPKOWSKI J ET AL: "EMI/ESD solutions for the CAN network", NETWORKING, SENSING AND CONTROL, 2005. PROCEEDINGS. 2005 IEEE TUCSON, AZ, USA MARCH 19-22, 2005, PISCATAWAY, NJ, USA,IEEE, 19 March 2005 (2005-03-19), pages 413 - 418, XP010813367, ISBN: 978-0-7803-8812-3, DOI: 10.1109/ICNSC.2005.1461226 *

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