Can repeater

Abstract

The present application discloses a CAN repeater, comprising a processor and a CAN communication module, wherein the CAN communication module comprises a CAN signal input circuit and a CAN signal output circuit; an input end of the CAN signal input circuit is connected to a CAN main circuit and is configured to access a communication signal of the CAN main circuit; and an output end of the CAN signal input circuit is connected to a CAN signal input end of the processor, a CAN signal output end of the processor is connected to an input end of the CAN signal output circuit, and an output end of the CAN signal output circuit is electrically connected to a CAN branch circuit. When using star-shaped or tree-shaped wiring, the CAN repeater is added as a branch, so as to extend the communication distance of the branch circuit.

Description

A CAN repeater

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to application number 2024202538126 filed with the China Patent Office on January 31, 2024 and entitled “A CAN Repeater,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of bus communication technology, and in particular to a CAN repeater. Background Art

[0004] The statements in this section merely provide background technical information related to this application and do not necessarily constitute prior art.

[0005] The CAN communication network is a single-bus structure. The CAN bus uses a hand-in-hand wiring method, which can extend the transmission distance. However, this communication network structure does not have branch lines. When star-type, tree-type, and other wiring methods are required on site, the existing signal transmission devices lack a relay interface communication method between the main line and the branch line, and are therefore not suitable for star-type, tree-type, and other wiring methods.

[0006] Application Contents

[0007] In order to solve the above problems, the present application proposes a CAN repeater, which can be used as a branch when star or tree wiring is adopted to extend the communication distance of the branch line.

[0008] In order to achieve the above objectives, this application adopts the following technical solutions:

[0009] The present application provides a CAN repeater, comprising: a processor, a power supply module and a CAN communication module, wherein the CAN communication module comprises a CAN signal input circuit and a CAN signal output circuit;

[0010] The input end of the CAN signal input circuit is connected to the CAN main line and is configured to access the communication signal of the CAN main line;

[0011] The output end of the CAN signal input circuit is connected to the CAN signal input end of the processor, the CAN signal output end of the processor is connected to the input end of the CAN signal output circuit, and the output end of the CAN signal output circuit is electrically connected to the CAN branch line.

[0012] As an optional embodiment, the processor includes a first integrated chip;

[0013] The CAN access receiving pin of the first integrated chip is connected to the transmitting end of the CAN signal input circuit, and the CAN access transmitting pin of the first integrated chip is connected to the receiving end of the CAN signal input circuit, and is configured to receive the communication signal of the main line sent by the CAN signal input circuit;

[0014] The receiving pin of the CAN output of the first integrated chip is connected to the transmitting end of the CAN signal output circuit, and the transmitting pin of the CAN output of the first integrated chip is connected to the receiving end of the CAN signal output circuit, and is configured to send the communication signal of the main line to the CAN signal output circuit, so that the CAN signal output circuit sends the communication signal to the branch line.

[0015] As an optional embodiment, the CAN signal input circuit includes a fifth integrated chip, a CAN high level output pin and a CAN low level output pin of the fifth integrated chip are connected to the CAN main line, and is configured to receive the communication signal of the CAN main line;

[0016] The CAN signal output circuit includes a sixth integrated chip, a CAN high level output pin and a CAN low level output pin of the sixth integrated chip are connected to a CAN branch line, and is configured to transmit the communication signal of the CAN main line to the CAN branch line.

[0017] As an optional implementation, the CAN high and low level connection terminals of the CAN signal input circuit and the CAN high and low level connection terminals of the CAN signal output circuit are both provided with a protection circuit, and the protection circuit includes a voltage regulator connected in parallel to the CAN high and low level connection terminals and two groups of transient voltage suppression diodes connected in parallel to the CAN high and low level connection terminals respectively.

[0018] As an optional embodiment, the power supply module is connected to an external power source through a first puncture interface, the input end of the CAN communication module is connected to an external CAN main line through a second puncture interface, and the output end of the CAN communication module is connected to a branch line.

[0019] As an optional implementation, the power supply module is connected to an external power source through a first terminal, the input end of the CAN communication module is connected to an external communication line through a second terminal, and the output end of the CAN communication module is connected to a communication main line and a communication branch line respectively through third terminals.

[0020] As an optional implementation, the power supply module is further provided with at least one fourth wiring terminal, and the fourth wiring terminals are all short-circuited with the first wiring terminals to provide hand-in-hand power supply connections on the main line and the branch line.

[0021] As an optional embodiment, the power supply module includes an anti-reverse connection circuit, a first-level power supply step-down circuit, a second-level power supply step-down circuit and a third-level power supply step-down circuit connected in sequence; and the second-level power supply step-down circuit is configured to power the CAN communication module, and the third-level power supply step-down circuit is configured to power the processor.

[0022] As an optional implementation, the anti-reverse connection circuit includes a MOS tube, the positive electrode of the input power supply is connected in parallel to the gate and source of the MOS tube respectively through a voltage divider resistor, and the drain of the MOS tube is connected in parallel with the negative electrode of the input power supply through a capacitor and then grounded.

[0023] As an optional embodiment, the first-stage power step-down circuit, the second-stage power step-down circuit and the third-stage power step-down circuit all include a step-down chip, and the first-stage power step-down module also includes a fuse, and the fuse is configured for overload protection.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present application proposes a CAN repeater, which uses at least two CAN chips, wherein one CAN signal input circuit is configured to receive the communication signal of the main line and send it to the processor, which is then transmitted by the processor to another CAN signal output circuit, and then the communication signal of the main line is transmitted to the branch line through the CAN signal output circuit. Through the two CAN chips, when a star or tree type wiring is adopted, a CAN repeater is added as a branch to transmit the communication signal of the branch line, thereby extending the communication distance of the branch line.

[0026] The present application proposes a CAN repeater, which adopts a three-stage power supply step-down circuit connected in sequence to perform power supply voltage reduction, wherein the first-stage power supply step-down circuit is configured to reduce the input 48V voltage to 12V voltage, the second-stage power supply step-down circuit is configured to reduce the 12V voltage to 5V voltage, and the third-stage power supply step-down circuit is configured to reduce the 5V voltage to 3.3V voltage, and the second-stage power supply step-down circuit is configured to supply power to the CAN communication module, and the third-stage power supply step-down circuit is configured to supply power to the processor; the CAN repeater can realize the CAN branch wiring mode, and the output terminal and the input terminal are short-circuited for transmission on the CAN main line, and the CAN signal is processed by the processor on the branch line and then transmitted to the branch line for transmission; the power supply and CAN communication are connected to the repeater in a unified manner, which is convenient for on-site wiring, small construction volume, and convenient for later maintenance and replacement.

[0027] The advantages of additional aspects of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0029] FIG1 is a schematic diagram of the overall framework of a CAN repeater provided in an embodiment of the present application;

[0030] Figures 2(a) and 2(b) are schematic circuit diagrams of a power step-down module provided in an embodiment of the present application; Figure 2(a) is a schematic circuit diagram of the connection between the anti-reverse connection circuit and the first-stage power step-down circuit, and Figure 2(b) is a schematic circuit diagram of the connection between the first-stage power step-down circuit and the second-stage power step-down circuit;

[0031] FIG3 is a circuit diagram of a processor provided in an embodiment of the present application;

[0032] FIG4 is a circuit diagram of a CAN signal input circuit provided in an embodiment of the present application;

[0033] FIG5 is a circuit diagram of a CAN signal output circuit provided in an embodiment of the present application;

[0034] FIG6 is a schematic diagram of a wiring terminal according to an embodiment of the present application;

[0035] FIG7 is a second schematic diagram of a connection terminal provided in an embodiment of the present application;

[0036] FIG8 is a third schematic diagram of the connection terminal provided in an embodiment of the present application.

[0037] Among them, 1. power supply module, 2. processor, 3. CAN signal input circuit, 4. CAN signal output circuit, 5. first puncture interface, 6. second puncture interface, 7. first power interface, 8. second power interface, 9. third power interface, 10. first CAN interface, 11. second CAN interface, 12. third CAN interface, 13. power socket, 14. fourth CAN interface, 15. fifth CAN interface, 16. sixth CAN interface. DETAILED DESCRIPTION

[0038] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "comprise" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0042] As shown in FIG1 , this embodiment provides a CAN repeater, comprising: a processor 2 and a CAN communication module, wherein the CAN communication module comprises a CAN signal input circuit 3 and a CAN signal output circuit 4;

[0043] The input end of the CAN signal input circuit 3 is connected to the CAN main line and is configured to connect the communication signal of the CAN main line;

[0044] The output end of the CAN signal input circuit 3 is connected to the CAN signal input end of the processor 2, the CAN signal output end of the processor 2 is connected to the input end of the CAN signal output circuit 4, and the output end of the CAN signal output circuit 4 is electrically connected to the CAN branch line.

[0045] In this embodiment, the CAN repeater further includes a power supply module 1, which includes: an anti-reverse connection circuit and a three-stage power supply step-down circuit connected in sequence;

[0046] As shown in FIG2(a), the reverse connection prevention circuit includes: a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a MOS transistor Q1; one end of the capacitor C1 is connected to one end of the resistor R2, the other end of the capacitor C1 is connected to the drain of the MOS transistor Q1 and to ground, the source of the MOS transistor Q1 is connected to the other end of the resistor R2, and then connected in series with the resistors R4 and R3, the gate of the MOS transistor Q1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the connection point of the resistors R4 and R3.

[0047] The three-stage power supply step-down circuit connected in sequence includes a first-stage power supply step-down circuit, a second-stage power supply step-down circuit and a third-stage power supply step-down circuit; the first-stage power supply step-down circuit is configured to reduce the input 48V voltage to 12V voltage, the second-stage power supply step-down circuit is configured to reduce the 12V voltage to 5V voltage, and the third-stage power supply step-down circuit is configured to reduce the 5V voltage to 3.3V voltage, and the second-stage power supply step-down circuit is mainly configured to power the CAN communication module, and the third-stage power supply step-down circuit is mainly configured to power the processor.

[0048] In this embodiment, as shown in FIG2( a ), the first-stage power supply step-down circuit includes: a third integrated chip U3, a fuse F1, a chip resistor RV1, a first inductor L1, a first diode D1, a third diode D3, a tenth diode D10, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fifteenth resistor R15, a sixteenth resistor R16, a fifth capacitor C5, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, an eleventh capacitor C11, a fourteenth capacitor C14, a seventeenth capacitor C17, and an eighteenth capacitor C18;

[0049] Specifically:

[0050] The IN pin of the integrated chip U3 is connected to the EN pin through the resistor R8;

[0051] One end of the fuse F1 is connected to the resistor R3 of the anti-reverse connection circuit and is connected to the 48V voltage. The other end of the fuse F1 is connected in parallel to the varistor RV1, capacitor C5, diode D1, capacitor C7, capacitor C8 and capacitor C9, and then connected to the IN pin of the integrated chip U3.

[0052] The BS pin of the integrated chip U3 is connected in series with the resistor R9, the capacitor C11 and the inductor L1. The connection point between the capacitor C11 and the inductor L1 is connected to the SW pin of the integrated chip U3 and the output end of the diode D10.

[0053] The other end of the inductor L1 is connected in parallel to a capacitor C14, a resistor group consisting of a resistor R15 and a resistor R16, a capacitor C17, and a capacitor C18;

[0054] A parallel connection point of the capacitor C14 and the resistor R15 is connected to the FB pin of the integrated chip U3 , and the resistor R16 is connected in parallel to the input end of the diode DR10 .

[0055] Capacitor C18 is connected in parallel with resistor R10 and diode D3. Resistor R10 and diode D3 are connected in series. One end of resistor R10 is connected to the input end of diode D3. The output end of diode D3 is connected to capacitor C18 and grounded. The other end of resistor R10 is connected to capacitor C18 and outputs a 12V voltage.

[0056] Therefore, the integrated chip U3 is connected to 48V and then steps down the voltage to output 12V.

[0057] As an optional implementation method, the other ends of the parallel-connected chip resistor RV1, capacitor C5, diode D1, capacitor C7, capacitor C8 and capacitor C9, as well as the GND pin of the integrated chip U3, the input end of the parallel-connected diode D10, the resistor R16, capacitor C17, capacitor C18 and the output end of the diode D3 are all grounded.

[0058] As an optional implementation, the model of the integrated chip U3 is CAD100V06S0T236.

[0059] As an optional embodiment, the diode D1 is a transient voltage suppression (TVS) diode configured to reduce the forward voltage while preventing reverse current; the diode D10 is a Schottky diode configured to prevent pulses.

[0060] As an optional implementation, the model of the fuse F1 is FU63V3A1206.

[0061] In this embodiment, as shown in FIG2( b ), the second-stage power supply step-down circuit includes: a seventh integrated chip U7 , an eleventh resistor R11 , a twelfth resistor R12 , a thirteenth resistor R13 , a nineteenth capacitor C19 , a twenty-fourth capacitor C24 , a twenty-fifth capacitor C25 , and a second inductor L2 ;

[0062] Specifically:

[0063] The IN pin of the integrated chip U7 is connected to a 12V voltage;

[0064] The IN pin of the integrated chip U7 is connected to one end of the resistor R11, and the other end of R11 is connected to the EN pin of the integrated chip U7;

[0065] The IN pin of the integrated chip U7 is also connected to one end of the capacitor C19, and the other end of the capacitor C19 is connected to the GND pin of the integrated chip U7 and is grounded.

[0066] The BS pin of the integrated chip U7 is connected in series with the capacitor C24 and the inductor L2. The connection point between the capacitor C24 and the inductor L2 is connected to the SW pin of the integrated chip U7. The other end of the inductor L2 is connected in parallel with the resistor group consisting of the resistor R12 and the resistor R13 and the capacitor C25.

[0067] Resistor R12 and resistor R13 are connected in series, and the connection point is connected to the FB pin of the integrated chip U7;

[0068] One end of the capacitor C25 is connected to the resistor 12 and outputs a 5V voltage, and the other end of the capacitor C25 is connected to the resistor R13 and grounded.

[0069] Therefore, the integrated chip U7 is connected to 12V and then steps down the voltage to output 5V.

[0070] As an optional implementation, the model of the integrated chip U7 is RSD30V12S0T236.

[0071] In this embodiment, as shown in FIG2( b ), the third-stage power supply step-down circuit includes: an eighth integrated chip U8 , a twenty-sixth capacitor C26 , a twenty-seventh capacitor C27 , and a twenty-eighth capacitor C28 ;

[0072] Specifically:

[0073] The VIN pin of the integrated chip U8 is connected to a 5V voltage; the VIN pin and the CE pin of the integrated chip U8 are both connected to one end of the capacitor C26, and the other end of the capacitor C26 is grounded; the VSS pin of the integrated chip U8 is grounded.

[0074] The VOUT pin of the integrated chip U8 outputs a 3.3V voltage, and the VOUT pin of the integrated chip U8 is connected to a capacitor C27 and a capacitor C28 connected in parallel, and the other ends of the capacitor C27 and the capacitor C28 are grounded.

[0075] Therefore, the integrated chip U8 is connected to 5V and then steps down the voltage to output 3.3V voltage.

[0076] As an optional implementation, the model of the integrated chip U8 is LD06VR5A33S0T235.

[0077] It can be seen that the integrated chip U3, the integrated chip U7 and the integrated chip U8 are all step-down chips.

[0078] In this embodiment, as shown in FIG3 , the processor 2 includes an integrated chip U1;

[0079] The PB6 pin and PB5 pin on the integrated chip U1 are defined as the receiving and transmitting ends of the CAN signal input, respectively. Therefore, the PB6 pin of the integrated chip U1 is connected to the TXD pin of the CAN signal input circuit 3, and the PB5 pin of the integrated chip U1 is connected to the RXD pin of the CAN signal input circuit 3, and is configured to receive the communication signal of the main line sent by the CAN signal input circuit 3;

[0080] The PB12 pin and PB11 pin on the integrated chip U1 are defined as the receiving and transmitting ends of the CAN signal output, respectively. Therefore, the PA12 pin of the integrated chip U1 is connected to the TXD pin of the CAN signal output circuit 4, and the PA11 pin of the integrated chip U1 is connected to the RXD pin of the CAN signal output circuit 4, and is configured to send the communication signal of the main line to the CAN signal output circuit 4, so that the CAN signal output circuit 4 sends the communication signal to the remote device on the branch line.

[0081] As an optional implementation, the integrated chip U1 further integrates a start-up and reset circuit, a crystal oscillator circuit, a first protection circuit, and connection terminals.

[0082] Specifically:

[0083] The startup and reset circuit includes: one end of the resistor R5 is connected to the third-stage power supply step-down circuit, configured to access the 3.3V voltage, and the other end of the resistor R5 is connected to the NRST pin of the integrated chip U1, configured to reset;

[0084] The other end of resistor R5 is also connected to one end of capacitor C3, the other end of capacitor C3 is connected to one end of capacitor C4 and one end of resistor R6 and then grounded, the other end of capacitor C4 and the other end of resistor R6 are connected to the BOOTO pin of integrated chip U1, and are configured to start.

[0085] The crystal oscillator circuit includes: an integrated chip U2; the OUT pin of the integrated chip U2 is connected to the PD0 pin of the integrated chip U1, the VDD pin of the integrated chip U2 is connected to a 3.3V voltage, and the VDD pin of the integrated chip U2 is connected to the GND pin of the integrated chip U2 through a capacitor C2 and is grounded.

[0086] The first protection circuit includes: capacitors C6 and C10 connected in parallel, one end of capacitors C6 and C10 is connected to the VDD pin of the integrated chip U1 after being connected to a 3.3V voltage, and the other end is grounded. Capacitors C6 and C10 are both protection capacitors configured to maintain power stability.

[0087] As an optional implementation, a debugging interface is also provided on the integrated chip U1.

[0088] As an optional implementation, the model of the integrated chip U1 is AT32F413KBU7.

[0089] As an optional implementation, the model of the integrated chip U2 is CO8M2520S.

[0090] In this embodiment, the CAN communication module includes a CAN signal input circuit 3 and a CAN signal output circuit 4. The CAN signal input circuit 3 is configured to send the communication signal of the main line to the processor 2. After being transmitted from the processor 2 to the CAN signal output circuit 4, the communication signal of the main line is transmitted to the branch line through the CAN signal output circuit 4. Through two CAN chips, the transmission of the communication signal of the branch line is realized when star or tree wiring is adopted.

[0091] In this embodiment, as shown in Figure 4, the CAN signal input circuit 3 includes an integrated chip U5, the TXD pin of the integrated chip U5 is connected to the PB6 pin of the integrated chip U1, the RXD pin of the integrated chip U5 is connected to the PB5 pin of the integrated chip U1, and the CANH pin and CANL pin of the integrated chip U5 are connected to the main line, and are configured to receive the communication signal of the main line.

[0092] The VCC1 pin of the integrated chip U5 is connected to the second-stage power supply step-down circuit and is configured to access a 5V voltage; the VCC1 pin of the integrated chip U5 is connected to capacitors C12 and C15 in parallel, one end of capacitors C12 and C15 is connected to a 5V voltage, and the other end is connected to the GND1 pin of the integrated chip U5 and then grounded.

[0093] The integrated chip U5 also integrates a second protection circuit, specifically including: the VISO pin of the integrated chip U5 is connected to the capacitor C20 and the capacitor C21 connected in parallel, and the other ends of the capacitors C20 and C21 are connected to the GND2 pin of the integrated chip U5 and then grounded;

[0094] The CANH pin of the integrated chip U5 is connected to one end of the diode D4 and the first cathode port of the Zener diode D8, the CANL pin of the integrated chip U5 is connected to one end of the diode D5 and the second cathode port of the Zener diode D8, the other end of the diode D4, the other end of the diode D5 and the common anode port of the Zener diode D8 are connected, and then connected to the GND2 pin of the integrated chip U5 and grounded.

[0095] In this embodiment, as shown in Figure 5, the CAN signal output circuit 4 includes an integrated chip U6, the TXD pin of the integrated chip U6 is connected to the PA12 pin of the integrated chip U1, and the RXD pin of the integrated chip U6 is connected to the PA11 pin of the integrated chip U1; the CANH pin and CANL pin of the integrated chip U6 are connected to the branch line, and are configured to transmit the communication signal of the main line to the branch line.

[0096] The VCC1 pin of the integrated chip U6 is connected to the second-stage power supply step-down circuit and is configured to access a 5V voltage; the VCC1 pin of the integrated chip U6 is connected to capacitors C13 and C16 in parallel, one end of capacitors C13 and C16 is connected to a 5V voltage, and the other end is connected to the GND1 pin of the integrated chip U6 and then grounded.

[0097] The integrated chip U6 also integrates a third protection circuit, specifically including: the VISO pin of the integrated chip U6 is connected to the capacitor C22 and the capacitor C23 connected in parallel, and the other ends of the capacitors C22 and C23 are connected to the GND2 pin of the integrated chip U6 and then grounded;

[0098] The CANH pin of the integrated chip U6 is connected to one end of the diode D6 and the first cathode port of the Zener diode D9, the CANL pin of the integrated chip U6 is connected to one end of the diode D7 and the second cathode port of the Zener diode D9, the other end of the diode D6, the other end of the diode D7 and the common anode port of the Zener diode D9 are connected to the GND2 pin of the integrated chip U6 and grounded.

[0099] As an optional embodiment, the diodes D4 , D5 , D6 , and D7 are all transient voltage suppression (TVS) diodes configured to reduce forward voltage while preventing reverse current.

[0100] As can be seen, resistors R14 are connected in series between the two ends of the CAN bus, CANH and CANL, respectively, to match the bus impedance, absorb signal reflection and callback, and improve the anti-interference ability and reliability of data communication.

[0101] As an optional implementation, the model of the integrated chip U5 and the integrated chip U6 is CAN-CP-TR01.

[0102] As shown in Figure 6, the power supply module is connected to an external power source via a first puncture interface 5, the input end of the CAN signal input circuit is connected to an external CAN main line via a second puncture interface 6, and the output end of the CAN signal output circuit is connected to a branch line. In this wiring method, the power line and the CAN communication line are directly laid out on a main line, and the connection is directly made by puncturing at the required locations, which greatly reduces the complexity of on-site construction, reduces wiring difficulty, and improves construction efficiency.

[0103] As shown in Figure 7, compared with the previous embodiment, the main difference of this embodiment is that: the repeater is provided with a power socket 13, a fourth CAN interface 14, a fifth CAN interface 15 and a sixth CAN interface 16, the power supply module is externally connected to the power supply through the power socket 13, the input end of the CAN signal input circuit is externally connected to the CAN main line through the fourth CAN interface 14, the output end of the CAN signal output circuit is connected to the CAN main line and the communication branch line through the sixth CAN interface 16, the fifth CAN interface 15 is short-circuited with the fourth CAN interface 14, and connected to the CAN main line.

[0104] As shown in Figure 8, compared with the above-mentioned embodiment, the main difference of this embodiment is that: six wiring terminals are provided on the repeater of this embodiment, three of which are power wiring terminals, namely the first power interface 7, the second power interface 8 and the third power interface 9; three are CAN wiring terminals, namely the first CAN interface 10, the second CAN interface 11 and the third CAN interface 12. The first CAN interface 10, the second CAN interface 11 and the third CAN interface 12 can refer to the connection method of the above-mentioned embodiment, that is, the interface on the CAN main line is short-circuited, and the other interface is connected to the CAN signal output circuit. The first power interface 7, the second power interface 8 and the third power interface 9 are short-circuited with each other, that is, the power supply can be wired in a hand-in-hand connection manner.

[0105] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it does not limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or variations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application. Industrial Applicability

[0106] The CAN repeater of the present application includes a processor and a CAN communication module. The input end of the CAN signal input circuit of the CAN communication module is connected to the CAN main line, the output end of the CAN signal input circuit of the CAN communication module is connected to the CAN signal input end of the processor, the CAN signal output end of the processor is connected to the input end of the CAN signal output circuit, and the output end of the CAN signal output circuit is electrically connected to a CAN branch line. When a star or tree wiring is adopted, the CAN repeater can be added as a branch to extend the communication distance of the branch line.

Claims

1. A CAN repeater, characterized in that: include: A processor, a power supply module and a CAN communication module, wherein the CAN communication module includes a CAN signal input circuit and a CAN signal output circuit; The input end of the CAN signal input circuit is connected to the CAN main line and is configured to access the communication signal of the CAN main line; The output end of the CAN signal input circuit is connected to the CAN signal input end of the processor, the CAN signal output end of the processor is connected to the input end of the CAN signal output circuit, and the output end of the CAN signal output circuit is electrically connected to the CAN branch line.

2. A CAN repeater according to claim 1, characterized in that: The processor includes a first integrated chip; The CAN access receiving pin of the first integrated chip is connected to the transmitting end of the CAN signal input circuit, and the CAN access transmitting pin of the first integrated chip is connected to the receiving end of the CAN signal input circuit, and is configured to receive the communication signal of the main line sent by the CAN signal input circuit; The receiving pin of the CAN output of the first integrated chip is connected to the transmitting end of the CAN signal output circuit, and the transmitting pin of the CAN output of the first integrated chip is connected to the receiving end of the CAN signal output circuit, and is configured to send the communication signal of the main line to the CAN signal output circuit, so that the CAN signal output circuit sends the communication signal to the branch line.

3. A CAN repeater according to claim 1, characterized in that: The CAN signal input circuit includes a fifth integrated chip, a CAN high level output pin and a CAN low level output pin of the fifth integrated chip are connected to the CAN main line, and is configured to receive the communication signal of the CAN main line; The CAN signal output circuit includes a sixth integrated chip, a CAN high level output pin and a CAN low level output pin of the sixth integrated chip are connected to a CAN branch line, and is configured to transmit the communication signal of the CAN main line to the CAN branch line.

4. A CAN repeater as claimed in claim 3, characterized in that: The CAN high and low level connection terminals of the CAN signal input circuit and the CAN high and low level connection terminals of the CAN signal output circuit are both provided with a protection circuit, and the protection circuit includes a voltage regulator connected in parallel with the CAN high and low level connection terminals and two groups of transient voltage suppression diodes connected in parallel with the CAN high and low level connection terminals respectively.

5. A CAN repeater according to claim 1, characterized in that: The power supply module is connected to an external power source through a first puncture interface, the input end of the CAN communication module is connected to an external CAN main line through a second puncture interface, and the output end of the CAN communication module is connected to a branch line.

6. A CAN repeater according to claim 1, characterized in that: The power supply module is connected to an external power source through a first terminal, the input end of the CAN communication module is connected to an external communication line through a second terminal, and the output end of the CAN communication module is connected to a communication main line and a communication branch line respectively through a third terminal.

7. A CAN repeater as claimed in claim 6, characterized in that: The power supply module is further provided with at least one fourth wiring terminal, and the fourth wiring terminals are all short-circuited with the first wiring terminals to form hand-in-hand power supply connections on the main line and the branch line.

8. A CAN repeater as claimed in claim 1, characterized in that: The power supply module includes an anti-reverse connection circuit, a first-level power supply step-down circuit, a second-level power supply step-down circuit and a third-level power supply step-down circuit connected in sequence; and the second-level power supply step-down circuit is configured to power the CAN communication module, and the third-level power supply step-down circuit is configured to power the processor.

9. A CAN repeater as claimed in claim 8, characterized in that: The anti-reverse connection circuit includes a MOS tube. The positive electrode of the input power supply is connected in parallel to the gate and source of the MOS tube through a voltage divider resistor. The drain of the MOS tube is connected in parallel with the negative electrode of the input power supply through a capacitor and then grounded.

10. The CAN repeater according to claim 8, characterized in that: The anti-reverse connection circuit includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a MOS transistor; one end of the first capacitor is connected to one end of the second resistor, the other end of the first capacitor is connected to the drain of the MOS transistor and grounded, the source of the MOS transistor is connected to the other end of the second resistor and then connected in series with the fourth resistor and the third resistor, the gate of the MOS transistor is connected to one end of the first resistor, and the other end of the first resistor is connected to the connection point of the fourth resistor and the third resistor.

11. A CAN repeater according to claim 10, characterized in that: The first-stage power supply step-down circuit includes: a third integrated chip, a fuse, a chip resistor, a first inductor, a first diode, a third diode, a tenth diode, an eighth resistor, a ninth resistor, a tenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, an eleventh capacitor, a fourteenth capacitor, a seventeenth capacitor, and an eighteenth capacitor; The IN pin of the third integrated chip is connected to the EN pin via the eighth resistor; One end of the fuse is connected to the third resistor of the anti-reverse connection circuit and is connected to a 48V voltage, and the other end of the fuse is connected in parallel to the chip resistor, the fifth capacitor, the first diode, the seventh capacitor, the eighth capacitor, and the ninth capacitor, and then connected to the IN pin of the third integrated chip; The BS pin of the third integrated chip is connected in series with the ninth resistor, the eleventh capacitor, and the first inductor, and a connection point between the eleventh capacitor and the first inductor is connected to the SW pin of the third integrated chip and the output end of the tenth diode; The other end of the first inductor is sequentially connected in parallel to the fourteenth capacitor, the resistor group consisting of the fifteenth resistor and the sixteenth resistor, the seventeenth capacitor, and the eighteenth capacitor; A parallel connection point of the fourteenth capacitor and the fifteenth resistor is connected to the FB pin of the third integrated chip, and the sixteenth resistor is connected in parallel to the input end of the tenth diode; The eighteenth capacitor is connected in parallel with the tenth resistor and the third diode, and the tenth resistor and the third diode are connected in series. One end of the tenth resistor is connected to the input end of the third diode, the output end of the third diode is connected to the eighteenth capacitor and grounded, and the other end of the tenth resistor is connected to the eighteenth capacitor and outputs a 12V voltage.

12. A CAN repeater according to claim 9, characterized in that: The second-stage power supply step-down circuit includes: a seventh integrated chip, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a nineteenth capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, and a second inductor. The IN pin of the seventh integrated chip is connected to a 12V voltage; The IN pin of the seventh integrated chip is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the EN pin of the seventh integrated chip; The IN pin of the seventh integrated chip is further connected to one end of the nineteenth capacitor, and the other end of the nineteenth capacitor is connected to the GND pin of the seventh integrated chip and grounded; The BS pin of the seventh integrated chip is sequentially connected in series to the twenty-fourth capacitor and the second inductor, a connection point between the twenty-fourth capacitor and the second inductor is connected to the SW pin of the seventh integrated chip, and the other end of the second inductor is sequentially connected in parallel to a resistor group consisting of the twelfth resistor and the thirteenth resistor, and the twenty-fifth capacitor; The twelfth resistor and the thirteenth resistor are connected in series, and the connection point is connected to the FB pin of the seventh integrated chip; One end of the twenty-fifth capacitor is connected to the twelfth resistor and outputs a 5V voltage, and the other end of the twenty-fifth capacitor is connected to the thirteenth resistor and grounded.

13. The CAN repeater according to claim 9, characterized in that: The third-stage power supply step-down circuit includes: an eighth integrated chip, a twenty-sixth capacitor, a twenty-seventh capacitor, and a twenty-eighth capacitor; The VIN pin of the eighth integrated chip is connected to a 5V voltage; the VIN pin and the CE pin of the eighth integrated chip are both connected to one end of the twenty-sixth capacitor, and the other end of the twenty-sixth capacitor is grounded; the VSS pin of the eighth integrated chip is grounded; The VOUT pin of the eighth integrated chip outputs a 3.3V voltage, and the VOUT pin of the eighth integrated chip is connected to the 27th capacitor and the 28th capacitor in parallel, and the other ends of the 27th capacitor and the 28th capacitor are grounded.

14. A CAN repeater as claimed in claim 2, characterized in that: The first integrated chip further includes a startup and reset circuit, the startup and reset circuit comprising: a fifth resistor, one end of the fifth resistor being connected to the third-stage power supply step-down circuit and configured to receive a 3.3V voltage, and the other end of the fifth resistor being connected to the NRST pin of the first integrated chip and configured to reset; The other end of the fifth resistor is also connected to one end of the third capacitor, the other end of the third capacitor is connected to one end of the fourth capacitor and one end of the sixth resistor and then grounded, the other end of the fourth capacitor and the other end of the sixth resistor are connected to the BOOTO pin of the first integrated chip and are configured to start.

15. The CAN repeater according to claim 8, characterized in that: The first-stage power step-down circuit, the second-stage power step-down circuit and the third-stage power step-down circuit all include step-down chips, and the first-stage power step-down module also includes a fuse configured for overload protection.

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