Multi-channel CAN / LIN communication switching board card

Abstract

The utility model relates to the technical field of automobile communication, and discloses a multichannel CAN / LIN communication switching board card, which comprises a power supply unit, a control unit, a CAN switching unit and an LIN switching unit, and is characterized in that the power supply unit is respectively connected with the control unit, the CAN switching unit and the LIN switching unit; and the control unit is respectively connected with the CAN switching unit and the LIN switching unit. By adopting a highly integrated design, a plurality of channels and a plurality of functions are integrated into a compact circuit board, so that the complexity and the size of the system are reduced, and the integration level and the reliability are improved. And meanwhile, independent CAN (Controller Area Network) and LIN (Local Interconnect Network) channels are provided, so that data transmission among a plurality of communication networks can be processed at the same time, higher flexibility is provided, and connection and control of a complex system and switching of various types of communication are supported.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of multi-channel CAN / LIN communication switching board card in the field of automobile communication technology, specifically relates to a kind of multi-channel CAN / LIN communication switching board card. BACKGROUND

[0002] With the rapid development of automotive electronics technology, the CAN / LIN communication of controller has the function of supporting high-speed data transmission, meets the demand of fast, real-time communication in various application fields. High-speed CAN-FD protocol and LIN 2.X can provide faster transmission rate and larger data load. At the same time, the integration of controller is higher and higher, and data transmission between multiple communication networks is more and more common. Therefore, multi-channel high-speed communication switching board card plays a very important role in the work of automobile controller.

[0003] However, the conventional operation is to set CAN and LIN communication separately into two kinds of board cards. But such setting has the following defects: first, the space utilization is not enough, when the number of board selection using dial switch is more, the space occupied by the required board card will be very large, at the same time, it also increases the risk of misoperation. Secondly, separate setting of board card will significantly increase the cost. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a kind of multi-channel CAN / LIN communication switching board card to solve the problem of insufficient space utilization and cost increase caused by setting CAN and LIN communication separately into two kinds of board cards.

[0005] The utility model provides a kind of multi-channel CAN / LIN communication switching board card, the multi-channel CAN / LIN communication switching board card includes: power supply unit, control unit, CAN switching unit and LIN switching unit, wherein,

[0006] The power supply unit is connected with the control unit, the CAN switching unit and the LIN switching unit respectively, and the power supply unit is used to power the control unit, the CAN switching unit and the LIN switching unit;

[0007] The control unit is connected with the CAN switching unit and the LIN switching unit respectively, and the control unit is used to output enable signal to the CAN switching unit and the LIN switching unit;

[0008] The CAN switching unit selects communication signal channel according to the enable signal and outputs communication signal;

[0009] The LIN switching unit selects communication signal channel according to the enable signal and outputs communication signal.

[0010] The utility model provides a kind of multi-channel CAN / LIN communication switching board, with highly integrated design, multiple channels and multiple functions are integrated into a compact circuit board, reduce the complexity and volume of system, improve the integration level and reliability. It has independent CAN and LIN channels simultaneously, can handle data transmission between multiple communication networks, provide greater flexibility, support complex system connection and control, and switching of multiple communications.

[0011] In an alternative embodiment, the control unit includes an enable module, the power supply pin of the enable module is connected with the power supply unit, the signal input pin of the enable module inputs level signal, and the signal output pin of the enable module is connected with the enable pin of the CAN switching unit and the enable pin of the LIN switching unit respectively.

[0012] The multi-channel CAN / LIN communication switching board has reliable hardware switching function, and can realize fast and reliable channel switching through control instruction. Meanwhile, the board also has automatic switching function, and can automatically switch channels according to predefined conditions and trigger events.

[0013] In an alternative embodiment, the CAN switching unit includes at least one CAN communication switching module, the power supply pin of each CAN communication switching module is connected with the power supply unit, the enable pin of each CAN communication switching module is connected with the signal output pin of the enable module, and each CAN communication switching module selects communication signal channel and outputs communication signal according to the enable signal.

[0014] In an alternative embodiment, the LIN switching unit includes at least one LIN switching unit, the power supply pin of each LIN communication switching module is connected with the power supply unit, the enable pin of each LIN communication switching module is connected with the signal output pin of the enable module, and each LIN communication switching module selects communication signal channel and outputs communication signal according to the enable signal.

[0015] The multi-channel CAN / LIN communication switching board has multiple independent CAN and LIN channels, can handle data transmission between multiple communication networks simultaneously, provide greater flexibility, and support complex system connection and control. It can support switching of multiple communications such as FlexRay, MOST and Ethernet.

[0016] In an alternative embodiment, when the CAN switching unit includes at least two CAN communication switching modules, the CAN communication switching modules realize cascade through the enable signal.

[0017] In an alternative embodiment, when the LIN switching unit comprises at least two LIN communication switching modules, the LIN communication switching modules are cascaded through the enable signal.

[0018] In an alternative embodiment, the power supply unit comprises: a first power module and a second power module, wherein,

[0019] The input pin of the first power module is connected to a DC power supply, the output pins of the first power module are respectively connected to the input pins of the second power module, the power supply pin of the CAN switching unit and the power supply pin of the LIN switching unit, and the ground pin of the first power module is grounded;

[0020] The output pin of the second power module is connected to the power supply pin of the control unit, and the ground pin of the second power module is grounded.

[0021] In an alternative embodiment, the power supply unit further comprises: a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein,

[0022] The first capacitor is connected in parallel between the input pin and the ground pin of the first power module;

[0023] The second capacitor is connected in parallel between the output pin and the ground pin of the first power module;

[0024] The third capacitor is connected in parallel between the input pin and the ground pin of the second power module;

[0025] The fourth capacitor is connected in parallel between the output pin and the ground pin of the second power module.

[0026] In an alternative embodiment, the power supply unit further comprises: a fifth capacitor, a first resistor and a second resistor, wherein,

[0027] One end of the first resistor is connected to the input pin of the second power module, the other end of the first resistor is respectively connected to one end of the fifth capacitor and the enable pin of the second power module, and the other end of the fifth capacitor is grounded;

[0028] One end of the second resistor is connected to the input pin of the first power module, and the other end of the second resistor is grounded.

[0029] In an alternative embodiment, the power supply unit further comprises: a first diode and a second diode, wherein,

[0030] The anode of the first diode is connected with a direct current power supply and one end of the second diode respectively, the cathode of the first diode is connected with an input pin of the first power module, and the other end of the second diode is grounded. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0032] Figure 1 is a system block diagram of a multi-channel CAN / LIN communication switching board card according to an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of a power supply unit according to an embodiment of the present application;

[0034] Figure 3 is a schematic diagram of a control unit according to an embodiment of the present application;

[0035] Figure 4 is a schematic diagram of a 2-way CAN communication switching module according to an embodiment of the present application;

[0036] Figure 5 is a schematic diagram of a 4-way LIN communication switching module according to an embodiment of the present application;

[0037] Figure 6 is a schematic diagram of an 8-way CAN communication switching module according to an embodiment of the present application;

[0038] Figure 7 is a schematic diagram of an 8-way LIN communication switching module according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] In the description of the utility model, it is necessary to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relation based on the orientation or positional relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the utility model, it is necessary to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relation based on the orientation or positional relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0043] The utility model provides a kind of multi-channel CAN / LIN communication switching board card. Figure 1 As shown in the figure, multi-channel CAN / LIN communication switching board card includes: power unit, control unit, CAN switching unit and LIN switching unit. Among them, power unit is connected with control unit, CAN switching unit and LIN switching unit respectively. Control unit is connected with CAN switching unit and LIN switching unit respectively.

[0044] Specifically, power unit is used to power control unit, CAN switching unit and LIN switching unit. Control unit is used to output enable signal to CAN switching unit and LIN switching unit. CAN switching unit selects communication signal channel according to enable signal and outputs communication signal. LIN switching unit selects communication signal channel according to enable signal and outputs communication signal.

[0045] The utility model provides a kind of multi-channel CAN / LIN communication switching board card, adopts highly integrated design, integrates multiple channels and multiple functions into a compact circuit board, reduces the complexity and volume of system, improves integration level and reliability. While having independent CAN and LIN channel, it can process data transmission between multiple communication networks simultaneously, provide greater flexibility, support connection and control of complex system and switching of multiple communications.

[0046] In an alternative embodiment, as shown in FIG. 4, the power supply unit comprises a first power module U101 and a second power module U102. The input pin of the first power module U101 is connected to a DC power supply. The output pin of the first power module U101 is connected to the input pin of the second power module U102, the power pin of the CAN switching unit and the power pin of the LIN switching unit respectively. The ground pin of the first power module U101 is grounded. The output pin of the second power module U102 is connected to the power pin of the control unit. The ground pin of the second power module U102 is grounded. Figure 2 Specifically, as shown in FIG. 5, the hardware part structure comprises a DC / DC voltage conversion principle diagram. The hardware part structure comprises a first power module U101 and a second power module U102. The functions of the two parts are mainly to convert voltage. The main function of the first power module U101 is to convert the 24V input voltage into a stable 15V output, which is used to supply power to the CAN switching unit and the LIN switching unit through VCC150. The second power module U102 is used to convert the converted 15V voltage into a 5V output, which is used to supply power to the control unit through VCC50. The model of the first power module U101 is LM2940S-5.0. The model of the second power module U102 is NCV4266ST50T.

[0047] Figure 2 In an alternative embodiment, as shown in FIG. 6, the power supply unit further comprises a first capacitor C101, a second capacitor C102, a third capacitor C103 and a fourth capacitor C104. The first capacitor C101 is connected in parallel between the input pin and the ground pin of the first power module U101. The second capacitor C102 is connected in parallel between the output pin and the ground pin of the first power module U101. The third capacitor C103 is connected in parallel between the input pin and the ground pin of the second power module U102. The fourth capacitor C104 is connected in parallel between the output pin and the ground pin of the second power module U102.

[0048] Specifically, as shown in FIG. 7, the main function of the capacitor C101 is to ensure the stability of the input signal of the first power module U101. The main function of the capacitor C102 is to improve the stability of the output voltage of the first power module U101. The main function of the capacitor C103 is to ensure the stability of the input signal of the second power module U102. The main function of the capacitor C104 is to improve the stability of the output voltage of the second power module. Figure 2 In an alternative embodiment, as shown in FIG. 8, the power supply unit further comprises a first capacitor C101, a second capacitor C102, a third capacitor C103 and a fourth capacitor C104. The first capacitor C101 is connected in parallel between the input pin and the ground pin of the first power module U101. The second capacitor C102 is connected in parallel between the output pin and the ground pin of the first power module U101. The third capacitor C103 is connected in parallel between the input pin and the ground pin of the second power module U102. The fourth capacitor C104 is connected in parallel between the output pin and the ground pin of the second power module U102.

[0049] In an alternative embodiment, as shown in FIG. 9, the power supply unit further comprises a first capacitor C101, a second capacitor C102, a third capacitor C103 and a fourth capacitor C104. The first capacitor C101 is connected in parallel between the input pin and the ground pin of the first power module U101. The second capacitor C102 is connected in parallel between the output pin and the ground pin of the first power module U101. The third capacitor C103 is connected in parallel between the input pin and the ground pin of the second power module U102. The fourth capacitor C104 is connected in parallel between the output pin and the ground pin of the second power module U102.

[0050] Figure 2 ​​As shown, the power supply unit further comprises a fifth capacitor C105, a first resistor R101 and a second resistor R102. One end of the first resistor R101 is connected to the input pin of the second power module U102, the other end of the first resistor R101 is connected to one end of the fifth capacitor C105 and the enable pin of the second power module U102 respectively, and the other end of the fifth capacitor C105 is grounded. One end of the second resistor R102 is connected to the input pin of the first power module U101, and the other end of the second resistor R102 is grounded.

[0051] Specifically, the capacitor C105 mainly clamps the voltage of the enable pin of the second power module U102. The main function of the resistors R101 and R102 is current limiting. The LED lamp is a power supply indicator lamp.

[0052] In an alternative embodiment, as shown in Figure 2 As shown, the power supply unit further comprises a first diode D101 and a second diode D103. The anode of the first diode D101 is connected to the DC power supply and one end of the second diode D103 respectively, the cathode of the first diode D101 is connected to the input pin of the first power module U101, and the other end of the second diode D103 is grounded.

[0053] Specifically, the first diode D101 added at the interface position of the 24V DC power supply can prevent reverse connection. The main function of the transient suppression diode D103 connected in parallel at the interface position of the 24V DC power supply is to absorb transient overvoltage impact, maintain the stability of the input power supply voltage, shunt the excess voltage to the ground, protect the stability of the power supply input and other elements in the circuit from damage.

[0054] In an alternative embodiment, as shown in Figure 3 As shown, the control unit comprises an enable module U201, the power supply pin 16 of the enable module U201 is connected to the power supply unit, the signal input pins Q0.0-Q0.2 of the enable module U201 input level signals, and the signal output pins EN_00-EN_07 of the enable module U201 are connected to the enable pins of the CAN switching unit and the enable pins of the LIN switching unit respectively.

[0055] Specifically, Figure 2 The second power module U102 in the control unit supplies 5V voltage to the power supply pin 16 of the enable module U201 to supply power to the enable module U201. The capacitor C201 connected in parallel at the power supply pin 16 to the GND of the board ensures the stability of the power supply voltage. All GNDs in the board need to be common.

[0056] Further, the pin 6 of the enable module U201 controls the control chip of the enable module U201 to be enabled. Then, according to the combination logic level input by the input pins Q0.0-Q0.2 of the enable module U201, the signal output pins EN_00-EN_07 of the enable module U201 output corresponding enable signals. The model of the enable module U201 is SN74HC138-Q1.

[0057] The multi-channel CAN / LIN communication switching board card has reliable hardware switching function, and can realize fast and reliable channel switching through control instructions. Meanwhile, the board card also has automatic switching function, and can automatically switch channels according to predefined conditions and trigger events.

[0058] In an alternative embodiment, the CAN switching unit comprises at least one CAN communication switching module, the power supply pin VDD of each CAN communication switching module is connected with the power supply unit, the enable pins IN1-IN4 of each CAN communication switching module are connected with the signal output pins EN_00-EN_07 of the enable module U201, and each CAN communication switching module selects a communication signal channel and outputs a communication signal according to the enable signal.

[0059] Specifically, the CAN communication switching module is as shown in Figure 4 The CAN communication switching module U301 takes the VCC150 output by the first power supply module U101 as the power supply, and controls each CAN communication switching module in the CAN switching unit to switch signals according to the enable signals output by the signal output pins EN_00-EN_07 of the enable module U201. For example, when the enable pins IN1-IN4 of the CAN communication switching module U301 receive the enable signals, the communication signals will be switched from the S1-S4 channel to the D1-D4 channel. Through the CAN communication switching module U301, the input signals can be switched to the S1-S4 channel or the D1-D4 channel for output, or one signal can be selected from the S1-S4 channel and the D1-D4 channel for output, and the high-frequency digital signals can be quickly switched, so as to realize the routing, selection and distribution of signals. In addition, the CAN communication switching module U301 also has the functions of signal routing, signal selection and signal isolation. The power supply VCC150 of the CAN communication switching module U301 is connected with the capacitor C301 in parallel, which mainly ensures the stability of the power supply. The model of the CAN communication switching module is ADG1611BRUZ.

[0060] In an alternative embodiment, the LIN switching unit comprises at least one LIN switching module, the power supply pin VDD of each LIN switching module is connected to the power supply unit, the enable pin IN1-IN4 of each LIN switching module is connected to the signal output pin EN_00-EN_07 of the enable module U201, and each LIN switching module selects a communication signal channel according to the enable signal and outputs the communication signal.

[0061] Specifically, the LIN switching module is as shown in Figure 5 The LIN switching module U305 uses the VCC150 output by the first power supply module U101 as the power supply, and controls each LIN switching module in the LIN switching unit according to the enable signal output by the signal output pin EN_00-EN_07 of the enable module U201. For example, when the enable pin IN1-IN4 of the LIN switching module U301 receives the enable signal, the communication signal is switched from the S1-S4 channel to the D1-D4 channel. The LIN switching module U301 can switch the input signal to the S1-S4 channel or the D1-D4 channel for output, or select a signal from the S1-S4 channel and the D1-D4 channel for output, and can quickly switch high-frequency digital signals to realize signal routing, selection and distribution. In addition, the LIN switching module U301 also has the functions of signal routing, signal selection and signal isolation. The parallel capacitor C305 at the power supply VCC150 of the LIN switching module U301 mainly ensures the stability of the power supply. The model of the LIN switching module is ADG1611BRUZ.

[0062] The multi-channel CAN / LIN communication switching board has multiple independent CAN and LIN channels, can simultaneously process data transmission between multiple communication networks, provides greater flexibility, and supports connection and control of complex systems. It can support switching of multiple communications such as FlexRay, MOST and Ethernet.

[0063] In an alternative embodiment, as shown in Figure 6 When the CAN switching unit comprises at least two CAN switching modules, the CAN switching modules are cascaded by the enable signal.

[0064] Specifically, an 8-channel CAN communication switching circuit schematic diagram is as shown in Figure 6 This part is composed of four 2-channel CAN communication switching modules, which are cascaded by the enable module U201 Figure 3 to a certain extent to meet higher demands.

[0065] In an alternative embodiment, as shown inFigure 7 As shown, when the LIN switching unit includes at least two LIN communication switching modules, the LIN communication switching modules are cascaded through an enable signal.

[0066] Specifically, an 8-way LIN communication switching circuit schematic diagram is as shown in the figure. Figure 7 As shown, this part is composed of two 4-way LIN communication switching modules, and the two modules are cascaded through an enable module U201, which can meet different switching requirements. Figure 3 As shown, this part is composed of two 4-way LIN communication switching modules, and the two modules are cascaded through an enable module U201, which can meet different switching requirements.

[0067] The multi-channel CAN / LIN communication switching board card supports higher data transmission rate and larger information load rate. It can realize faster and more stable data transmission through CAN-FD protocol and LIN 2.x technology, and adapt to various real-time communication requirements. At the same time, the multi-channel CAN / LIN communication switching board card is suitable for various application scenarios, including automobile electronic systems, industrial control, communication equipment, etc. It can help users to realize multi-channel data transmission and control in complex communication environment.

[0068] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A multi-channel CAN / LIN communication switching board card, characterized in that, The multi-channel CAN / LIN communication switching board card comprises a power supply unit, a control unit, a CAN switching unit and a LIN switching unit, wherein, The power supply unit is connected with the control unit, the CAN switching unit and the LIN switching unit respectively, and is used for supplying power to the control unit, the CAN switching unit and the LIN switching unit; The control unit is connected with the CAN switching unit and the LIN switching unit respectively, and is used for outputting an enable signal to the CAN switching unit and the LIN switching unit; The CAN switching unit selects a communication signal channel according to the enable signal and outputs a communication signal; The LIN switching unit selects a communication signal channel according to the enable signal and outputs a communication signal.

2. The multi-channel CAN / LIN communication switch board card of claim 1, wherein, The control unit comprises an enable module, a power supply pin of the enable module is connected with the power supply unit, a signal input pin of the enable module inputs a level signal, and signal output pins of the enable module are connected with an enable pin of the CAN switching unit and an enable pin of the LIN switching unit respectively.

3. The multi-channel CAN / LIN communication switch board card of claim 2, wherein, The CAN switching unit comprises at least one CAN communication switching module, a power supply pin of each CAN communication switching module is connected with the power supply unit, an enable pin of each CAN communication switching module is connected with the signal output pin of the enable module, and each CAN communication switching module selects a communication signal channel according to the enable signal and outputs a communication signal.

4. The multi-channel CAN / LIN communication switch board card of claim 2, wherein, The LIN switching unit comprises at least one LIN communication switching module, a power supply pin of each LIN communication switching module is connected with the power supply unit, an enable pin of each LIN communication switching module is connected with the signal output pin of the enable module, and each LIN communication switching module selects a communication signal channel according to the enable signal and outputs a communication signal.

5. The multi-channel CAN / LIN communication switch board card of claim 3, wherein, When the CAN switching unit comprises at least two CAN communication switching modules, the CAN communication switching modules are cascaded through the enable signal.

6. The multi-channel CAN / LIN communication switch board card of claim 4, wherein, When the LIN switching unit comprises at least two LIN communication switching modules, the LIN communication switching modules are cascaded through the enable signal.

7. The multi-lane CAN / LIN communication switch board card of claim 1, wherein, The power supply unit comprises a first power supply module and a second power supply module, wherein, An input pin of the first power supply module is connected with a direct current power supply, output pins of the first power supply module are connected with an input pin of the second power supply module, a power supply pin of the CAN switching unit and a power supply pin of the LIN switching unit respectively, and a grounding pin of the first power supply module is grounded; An output pin of the second power supply module is connected with a power supply pin of the control unit, and a grounding pin of the second power supply module is grounded.

8. The multi-lane CAN / LIN communication switch board card of claim 7, wherein, The power supply unit further comprises a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein, The first capacitor is connected in parallel between the input pin and the grounding pin of the first power supply module; The second capacitor is connected in parallel between the output pin and the grounding pin of the first power supply module; The third capacitor is connected in parallel between the input pin and the grounding pin of the second power supply module; The fourth capacitor is connected in parallel between the output pin and the grounding pin of the second power supply module. The fourth capacitor is connected in parallel between an output pin and a ground pin of the second power module.

9. The multi-lane CAN / LIN communication switch board card of claim 7, wherein, The power supply unit further comprises a fifth capacitor, a first resistor and a second resistor, wherein One end of the first resistor is connected to an input pin of the second power module, and the other end of the first resistor is respectively connected to one end of the fifth capacitor and an enable pin of the second power module, and the other end of the fifth capacitor is grounded. One end of the second resistor is connected to an input pin of the first power module, and the other end of the second resistor is grounded.

10. The multi-lane CAN / LIN communication switch board card of claim 7, wherein, The power supply unit further comprises a first diode and a second diode, wherein An anode of the first diode is respectively connected to a direct current power supply and one end of the second diode, a cathode of the first diode is connected to an input pin of the first power module, and the other end of the second diode is grounded.

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