CAN bus driving circuit, CAN transceiver and CAN bus structure

Abstract

The invention provides a CAN bus driving circuit, a CAN transceiver and a CAN bus structure, and the CAN bus driving circuit comprises a bias generation module which generates a first bias signal and a second bias signal; the current slope control module is connected to the output end of the bias generation module, receives the sending signal, and is used for generating a first current and a second current and carrying out step-by-step control on the sizes of the first current and the second current; one end of the first high-voltage driving module is connected with the first current, and the other end outputs a first output signal for providing high-voltage protection; one end of the second high-voltage driving module is connected with second current, and the other end outputs a second output signal for providing high-voltage protection; the first output signal and the second output signal form a differential signal. According to the invention, not only is the high-voltage protection function realized, but also the provided bus signal has excellent stability and symmetry, so that the electromagnetic radiation performance is relatively low.

Description

Technical Field

[0001] The present invention relates to the field of analog integrated circuit design, and in particular to a CAN bus driving circuit, a CAN transceiver and a CAN bus structure. Background Art

[0002] Controller Area Network (CAN) is a serial communication protocol bus for real-time applications. It can use twisted pair cables to transmit signals and is one of the most widely used field buses in the world. The CAN protocol is used for communication between various components in the car to replace expensive and bulky distribution harnesses. The perfection of the protocol has extended its use to applications such as automation and industry.

[0003] The symmetry and stability of the existing CAN bus drive circuit need to be improved, and the high-voltage protection function is relatively imperfect. Therefore, how to improve the symmetry and stability of the CAN bus drive circuit while improving the high-voltage protection function of the CAN bus driver has become one of the technical problems that technicians in this field need to solve urgently.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a CAN bus driving circuit, a CAN transceiver and a CAN bus structure, which are used to solve the problems of poor symmetry and stability of the CAN bus driving circuit in the prior art, and imperfect high-voltage protection function.

[0006] To achieve the above-mentioned object and other related objects, the present invention provides a CAN bus driving circuit, wherein the CAN bus driving circuit at least comprises:

[0007] A bias generating module, a current slope controlling module, a first high voltage driving module and a second high voltage driving module;

[0008] The bias generating module is used to generate a first bias signal and a second bias signal;

[0009] The current slope control module is connected to the output end of the bias generation module and receives a transmission signal, and is used to generate a first current and a second current, and to control the magnitudes of the first current and the second current step by step;

[0010] One end of the first high-voltage driving module is connected to the first current, and the other end thereof outputs a first output signal for providing high-voltage protection;

[0011] One end of the second high-voltage driving module is connected to the second current, and the other end outputs a second output signal for providing high-voltage protection; the first output signal and the second output signal form a differential signal.

[0012] Optionally, the current slope control module includes N levels of slope control units cascaded in sequence, N being a natural number greater than or equal to 2; each slope control unit generates a corresponding pull-up current and a pull-down current based on the first bias signal and the second bias signal; and outputs the corresponding pull-up current and the pull-down current step by step when switching to the dominant working state based on the control of the sending signal, and shuts off the corresponding pull-up current and the pull-down current step by step when switching to the recessive working state;

[0013] The sum of the pull-up currents of the slope control units constitutes the first current; and the sum of the pull-down currents of the slope control units constitutes the second current.

[0014] More optionally, each slope control unit includes a first inverter, a second inverter, a first transmission gate, a second transmission gate, a pull-up tube, a pull-down tube, a first PMOS tube and a first NMOS tube;

[0015] The input end of the first inverter serves as the input end of the slope control unit, and the output end is connected to the input end of the second inverter; the output end of the second inverter serves as the output end of the slope control unit;

[0016] The source of the first PMOS tube is connected to the power supply voltage, the gate is connected to the first bias signal via the first transmission gate, and the drain is connected to the first high-voltage driving module;

[0017] The source of the first NMOS tube is grounded, the gate is connected to the second bias signal via the second transmission gate, and the drain is connected to the second high-voltage driving module;

[0018] The control ends of the first transmission gate and the second transmission gate are connected to the first inverter, and the first transmission gate and the second transmission gate are turned on when switched to the dominant working state, and the first transmission gate and the second transmission gate are turned off when switched to the recessive working state;

[0019] The source of the pull-up tube is connected to the power supply voltage, the drain is connected to the gate of the first PMOS tube, and the gate is connected to the output end of the first inverter;

[0020] The source of the pull-down tube is grounded, the drain is connected to the gate of the first NMOS tube, and the gate is connected to the input end of the first inverter;

[0021] The input end of the first-stage slope control unit receives the transmission signal, and the input end of the subsequent-stage slope control unit is connected to the output end of the previous-stage slope control unit.

[0022] More optionally, the pull-up tube is a PMOS tube, and the pull-down tube is an NMOS tube.

[0023] More optionally, N is set to 10-30.

[0024] More optionally, the bias generating module includes a second PMOS tube, a second NMOS tube and a current source; the source of the second PMOS tube is connected to the power supply voltage, the gate and the drain are connected and output the first bias signal; the source of the second NMOS tube is grounded, the gate and the drain are connected and output the second bias signal; the current source is connected between the drain of the second PMOS tube and the drain of the second NMOS tube.

[0025] More optionally, the first high-voltage driving module includes a first high-voltage PMOS tube and a first high-voltage NMOS tube; the source of the first high-voltage NMOS tube receives the first current, and the drain is connected to the source of the first high-voltage PMOS tube; the drain of the first high-voltage PMOS tube outputs the first output signal; the gates of the first high-voltage PMOS tube and the first high-voltage NMOS tube receive a driving control signal.

[0026] More optionally, the second high-voltage driving module includes a second high-voltage PMOS tube and a second high-voltage NMOS tube; the source of the second high-voltage NMOS tube receives the second current, and the drain is connected to the source of the second high-voltage PMOS tube; the drain of the second high-voltage PMOS tube outputs the second output signal; the gates of the second high-voltage PMOS tube and the second high-voltage NMOS tube receive a driving control signal.

[0027] In order to achieve the above-mentioned object and other related objects, the present invention also provides a CAN transceiver, and the CAN transceiver at least includes: the above-mentioned CAN bus driving circuit.

[0028] To achieve the above-mentioned purpose and other related purposes, the present invention also provides a CAN bus structure, which at least includes: a CAN controller, a bus and the above-mentioned CAN transceiver; one end of the CAN transceiver is connected to the CAN controller, and the other end is connected to the bus for transmitting and receiving signals.

[0029] As described above, the CAN bus driving circuit, CAN transceiver and CAN bus structure of the present invention have the following beneficial effects:

[0030] The CAN bus driving circuit, CAN transceiver and CAN bus structure of the present invention not only have a high-voltage protection function, but also provide a bus signal with excellent stability and symmetry, and thus have lower electromagnetic radiation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shown is a structural schematic diagram of the CAN bus driving circuit of the present invention.

[0032] Figure 2 Shown is a structural schematic diagram of the current slope control module of the present invention.

[0033] Figure 3 Shown is a schematic diagram of the working principle of the CAN bus driving circuit of the present invention.

[0034] Figure 4 Shown is a schematic diagram of the CAN bus structure of the present invention.

[0035] Component number description

[0036] 1 CAN transceiver

[0037] 10 CAN bus drive circuit

[0038] 11 Bias generation module

[0039] 12 Current slope control module

[0040] 12a Slope control unit

[0041] 13. First high voltage driver module

[0042] 14. Second high voltage driver module

[0043] 2 CAN controller DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0045] See also Figure 1 to Figure 4 It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0046] like Figure 1 As shown, the present invention provides a CAN bus driving circuit 10, and the CAN bus driving circuit 10 at least includes:

[0047] The bias generating module 11 , the current slope controlling module 12 , the first high voltage driving module 13 and the second high voltage driving module 14 .

[0048] like Figure 1 As shown, the bias generating module 11 is used to generate a first bias signal vbp and a second bias signal vbn.

[0049] Specifically, in this embodiment, the bias generating module 11 includes a second PMOS transistor PM2, a second NMOS transistor NM2 and a current source Idc. The source of the second PMOS transistor PM2 is connected to the power supply voltage VCC, and the gate and the drain are connected and output the first bias signal vbp. The source of the second NMOS transistor NM2 is grounded GND, and the gate and the drain are connected and output the second bias signal vbn. The current source Idc is connected between the drain of the second PMOS transistor PM2 and the drain of the second NMOS transistor NM2. As an example, the current source Idc is a current mirror structure.

[0050] It should be noted that, in actual use, any circuit structure that can generate the first bias signal vbp and the second bias signal vbn is applicable to the present invention, and is not limited to this embodiment.

[0051] like Figure 1 As shown, the current slope control module 12 is connected to the output end of the bias generating module 11 and receives a transmission signal TXD, and is used to generate a first current CH and a second current CL, and to control the magnitudes of the first current CH and the second current CL step by step.

[0052] Specifically, the current slope control module 12 includes N levels of slope control units 12a cascaded in sequence, where N is a natural number greater than or equal to 2. Each slope control unit 12a generates a corresponding pull-up current and a pull-down current based on the first bias signal vbp and the second bias signal vbn; the corresponding pull-up current is obtained by mirroring the first bias signal vbp, and the corresponding pull-down current is obtained by mirroring the second bias signal vbn. Each slope control unit also outputs the corresponding pull-up current and pull-down current step by step when switching to the dominant working state based on the control of the transmission signal TXD, and turns off the corresponding pull-up current and pull-down current step by step when switching to the recessive working state; the transmission signal TXD controls the conduction and shutdown of each slope control unit 12a in turn through delay. Among them, the sum of the pull-up currents of each slope control unit 12a constitutes the first current CH; the sum of the pull-down currents of each slope control unit 12a constitutes the second current CL.

[0053] More specifically, if Figure 2As shown, in this embodiment, each slope control unit 12a includes a first inverter INV1, a second inverter INV2, a first transmission gate TG1, a second transmission gate TG2, a pull-up tube UP, a pull-down tube DN, a first PMOS tube PM1 and a first NMOS tube NM1. The input end of the first inverter INV1 serves as the input end step_in of the slope control unit, and the output end is connected to the input end of the second inverter INV2; the output end of the second inverter INV2 serves as the output end step_out of the slope control unit; the first inverter INV1 and the second inverter INV2 both have a delay. As an example, the delay of the first inverter INV1 is as small as possible, so that the switch control signals of the input and output ends of the first inverter INV1 are as synchronized as possible, and the delay time of the second inverter INV2 can be configured according to the delay time required for each stage and the number of stages N. The source of the first PMOS tube PM1 is connected to the power supply voltage VCC, the gate is connected to the first bias signal vbp via the first transmission gate TG1, and the drain is connected to the first high-voltage driving module 13. The source of the first NMOS tube NM1 is grounded GND, the gate is connected to the second bias signal vbn via the second transmission gate TG2, and the drain is connected to the second high-voltage driving module 14. The control ends of the first transmission gate TG1 and the second transmission gate TG2 are connected to the first inverter INV1. When switching to the dominant working state, the first transmission gate TG1 and the second transmission gate TG2 are turned on, and when switching to the recessive working state, the first transmission gate TG1 and the second transmission gate TG2 are turned off; in this example, the positive control end of the first transmission gate TG1 (i.e., the gate of the PMOS) is connected to the input end of the first inverter INV1, and the negative control end (i.e., the gate of the NMOS) is connected to the output end of the first inverter INV1; the positive control end of the second transmission gate TG2 is connected to the input end of the first inverter INV1, and the negative control end is connected to the output end of the first inverter INV1. The source of the pull-up tube UP is connected to the power supply voltage VCC, the drain is connected to the gate of the first PMOS tube PM1, and the gate is connected to the output end of the first inverter INV1; as an example, the pull-up tube UP is a PMOS tube. The source of the pull-down tube DN is grounded GND, the drain is connected to the gate of the first NMOS tube NM1, and the gate is connected to the input end of the first inverter INV1; as an example, the pull-down tube DN is an NMOS tube.In the cascade structure, the input terminal step_in of the first-stage slope control unit receives the transmission signal TXD, the input terminal step_in of the subsequent-stage slope control unit is connected to the output terminal step_out of the previous-stage slope control unit, that is, the input terminal step_in of the second-stage slope control unit is connected to the output terminal step_out of the first-stage slope control unit, the input terminal step_in of the third-stage slope control unit is connected to the output terminal step_out of the second-stage slope control unit, and so on. The output terminal of the last-stage slope control unit is suspended or used as an input signal of other circuits, which will not be described one by one here. In actual use, any circuit structure that can realize current slope control is applicable to the present invention, not limited to this embodiment.

[0054] It should be noted that the larger the number N of the slope control units 12a included in the current slope control module 12, the smoother the bus switching, but the corresponding design difficulty also increases. The smoothness and design difficulty can be weighed to determine the value of N as needed. As an example, N is set to 10 to 30, including but not limited to 12, 15, 18, 20, 23, 27, and 29.

[0055] like Figure 1 As shown, one end of the first high-voltage driving module 13 is connected to the first current CH, and the other end outputs a first output signal CANH for providing high-voltage protection.

[0056] Specifically, the device in the first high-voltage driving module 13 is a high-voltage tube. In this embodiment, the first high-voltage driving module 13 includes a first high-voltage PMOS tube HP1 and a first high-voltage NMOS tube HN1. The source of the first high-voltage NMOS tube HN1 receives the first current CH, and the drain is connected to the source of the first high-voltage PMOS tube HP1. The drain of the first high-voltage PMOS tube HP1 outputs the first output signal CANH. The gates of the first high-voltage PMOS tube HP1 and the first high-voltage NMOS tube HN1 receive a driving control signal. Any circuit that can realize driving and high-voltage protection is applicable to the present invention, not limited to this embodiment.

[0057] like Figure 1 As shown, one end of the second high-voltage driving module 14 is connected to the second current CL, and the other end outputs a second output signal CANL for providing high-voltage protection.

[0058] Specifically, the device in the second high-voltage driving module 14 is a high-voltage tube. In this embodiment, the second high-voltage driving module 14 includes a second high-voltage PMOS tube HP2 and a second high-voltage NMOS tube HN2. The source of the second high-voltage NMOS tube HN2 receives the second current CL, and the drain is connected to the source of the second high-voltage PMOS tube HP2. The drain of the second high-voltage PMOS tube HP2 outputs the second output signal CANL. The gates of the second high-voltage PMOS tube HP2 and the second high-voltage NMOS tube HN2 receive a driving control signal. Any circuit that can realize driving and high-voltage protection is applicable to the present invention, not limited to this embodiment.

[0059] It should be noted that the first high-voltage driving module 13 and the second high-voltage driving module 14 are used to provide high-voltage protection. When switched to the dominant working state, the first high-voltage driving module 13 and the second high-voltage driving module 14 can be regarded as linear region resistors. The output signals of the first high-voltage driving module 13 and the second high-voltage driving module 14 constitute differential signals.

[0060] The working principle of the CAN bus driving circuit 10 is as follows:

[0061] When the recessive state is switched to the dominant state, the transmission signal TXD changes from a high level to a low level, that is, the input signal of the first inverter INV1 in the first-stage slope control unit changes from a high level to a low level, the output signal of the first inverter INV1 in the first-stage slope control unit changes from a low level to a high level, the first transmission gate TG1 and the second transmission gate TG2 in the first-stage slope control unit switch from the off state to the on state, and the pull-up tube UP and the pull-down tube DN are both turned off. At this time, the gate of the first PMOS tube PM1 is connected to the first bias signal vbp, generating a corresponding pull-up current, and flowing into the first high-voltage driving module 13; the gate of the first NMOS tube NM1 is connected to the second bias signal vbn, generating a corresponding pull-down current, and flowing into the second high-voltage driving module 14. After a delay, the input signal of the first inverter INV1 in the second-stage slope control unit jumps from a high level to a low level, and performs the same operation as the first-stage slope control unit, and generates a second-stage pull-up current and a pull-down current. After a delay, N levels of pull-up current and pull-down current are generated in sequence. The N-level pull-up currents are merged to form the first current CH (gradually increasing), and the N-level pull-down currents are merged to form the second current CL (gradually increasing).

[0062] When the dominant state is switched to the recessive state, the transmission signal TXD changes from a low level to a high level, that is, the input signal of the first inverter INV1 in the first-stage slope control unit changes from a low level to a high level, the output signal of the first inverter INV1 in the first-stage slope control unit changes from a high level to a low level, the first transmission gate TG1 and the second transmission gate TG2 in the first-stage slope control unit switch from an on state to an off state, and the pull-up tube UP and the pull-down tube DN are both turned on. At this time, the gate of the first PMOS tube PM1 is pulled up to the power supply voltage VCC, in an off state, and the corresponding pull-up current is turned off; the gate of the first NMOS tube NM1 is pulled down to the ground GND, in an off state, and the corresponding pull-down current is turned off. After a delay, the input signal of the first inverter INV1 in the second-stage slope control unit jumps from a low level to a high level, performs the same operation as the first-stage slope control unit, and turns off the second-stage pull-up current and pull-down current. After a delay, the N-stage pull-up current and pull-down current are turned off in turn, and the first current CH gradually decreases to zero, and the second current CL gradually decreases to zero.

[0063] like Figure 3 As shown, when switching from recessive to dominant, the transmission signal TXD jumps from high level to low level, the first output signal CANH gradually increases, the second output signal CANL gradually decreases, and the difference between the first output signal CANH and the second output signal CANL gradually increases. When switching from dominant to recessive, the transmission signal TXD jumps from low level to high level, the first output signal CANH gradually decreases, the second output signal CANL gradually increases, and the difference between the first output signal CANH and the second output signal CANL gradually decreases. During the switching process, the waveforms of the first output signal CANH and the second output signal CANL are very symmetrical, and the bus differential voltage (the difference between the first output signal CANH and the second output signal CANL) can change linearly.

[0064] The present invention further provides a CAN transceiver 1, which at least comprises: a CAN bus driving circuit 10 of the present invention.

[0065] like Figure 4 As shown, the present invention also provides a CAN bus structure, which at least includes: the CAN transceiver 1, the CAN controller 2 and the bus; one end of the CAN transceiver 1 is connected to the CAN controller 2, and the other end is connected to the bus for transmitting and receiving signals. The differential signal on the bus is the CAN signal, and the CAN bus is a high-speed CAN bus topology structure or a low-speed CAN bus topology structure, which will not be described in detail here.

[0066] In summary, the present invention provides a CAN bus driving circuit, a CAN transceiver and a CAN bus structure, including: a bias generating module, a current slope control module, a first high-voltage driving module and a second high-voltage driving module; the bias generating module is used to generate a first bias signal and a second bias signal; the current slope control module is connected to the output end of the bias generating module, and receives and sends a signal, and is used to generate a first current and a second current, and the magnitude of the first current and the second current is controlled step by step; one end of the first high-voltage driving module is connected to the first current, and the other end outputs a first output signal for providing high-voltage protection; one end of the second high-voltage driving module is connected to the second current, and the other end outputs a second output signal for providing high-voltage protection; the first output signal and the second output signal constitute a differential signal. The CAN bus driving circuit, CAN transceiver and CAN bus structure of the present invention not only have a high-voltage protection function, but also provide a bus signal with excellent stability and symmetry, and thus have a lower electromagnetic radiation performance. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A CAN bus driving circuit, characterized in that: The CAN bus driving circuit at least comprises: A bias generating module, a current slope controlling module, a first high voltage driving module and a second high voltage driving module; The bias generating module is used to generate a first bias signal and a second bias signal; The current slope control module is connected to the output end of the bias generation module and receives a transmission signal, and is used to generate a first current and a second current, and to control the magnitudes of the first current and the second current step by step; One end of the first high-voltage driving module is connected to the first current, and the other end thereof outputs a first output signal for providing high-voltage protection; One end of the second high-voltage driving module is connected to the second current, and the other end outputs a second output signal for providing high-voltage protection; the first output signal and the second output signal form a differential signal.

2. The CAN bus driving circuit according to claim 1, characterized in that: The current slope control module includes N levels of slope control units cascaded in sequence, where N is a natural number greater than or equal to 2; Each slope control unit generates a corresponding pull-up current and a pull-down current based on the first bias signal and the second bias signal; and outputs the corresponding pull-up current and the pull-down current step by step when switching to a dominant working state based on the control of the transmission signal, and shuts off the corresponding pull-up current and the pull-down current step by step when switching to a recessive working state; The sum of the pull-up currents of the slope control units constitutes the first current; and the sum of the pull-down currents of the slope control units constitutes the second current.

3. The CAN bus driving circuit according to claim 2, characterized in that: Each slope control unit includes a first inverter, a second inverter, a first transmission gate, a second transmission gate, a pull-up tube, a pull-down tube, a first PMOS tube and a first NMOS tube; The input end of the first inverter serves as the input end of the slope control unit, and the output end is connected to the input end of the second inverter; the output end of the second inverter serves as the output end of the slope control unit; The source of the first PMOS tube is connected to the power supply voltage, the gate is connected to the first bias signal via the first transmission gate, and the drain is connected to the first high-voltage driving module; The source of the first NMOS tube is grounded, the gate is connected to the second bias signal via the second transmission gate, and the drain is connected to the second high-voltage driving module; The control ends of the first transmission gate and the second transmission gate are connected to the first inverter, and the first transmission gate and the second transmission gate are turned on when switched to the dominant working state, and the first transmission gate and the second transmission gate are turned off when switched to the recessive working state; The source of the pull-up tube is connected to the power supply voltage, the drain is connected to the gate of the first PMOS tube, and the gate is connected to the output end of the first inverter; The source of the pull-down tube is grounded, the drain is connected to the gate of the first NMOS tube, and the gate is connected to the input end of the first inverter; The input end of the first-stage slope control unit receives the transmission signal, and the input end of the subsequent-stage slope control unit is connected to the output end of the previous-stage slope control unit.

4. The CAN bus driving circuit according to claim 3, characterized in that: The pull-up tube is a PMOS tube, and the pull-down tube is an NMOS tube.

5. The CAN bus driving circuit according to any one of claims 1 to 4, characterized in that: N is set to 10 to 30.

6. The CAN bus driving circuit according to any one of claims 1 to 4, characterized in that: The bias generating module includes a second PMOS tube, a second NMOS tube and a current source; the source of the second PMOS tube is connected to the power supply voltage, the gate and the drain are connected and output the first bias signal; the source of the second NMOS tube is grounded, the gate and the drain are connected and output the second bias signal; The current source is connected between the drain of the second PMOS tube and the drain of the second NMOS tube.

7. The CAN bus driving circuit according to any one of claims 1 to 4, characterized in that: The first high-voltage driving module includes a first high-voltage PMOS tube and a first high-voltage NMOS tube; the source of the first high-voltage NMOS tube receives the first current, and the drain is connected to the source of the first high-voltage PMOS tube; the drain of the first high-voltage PMOS tube outputs the first output signal; the gates of the first high-voltage PMOS tube and the first high-voltage NMOS tube receive a driving control signal.

8. The CAN bus driving circuit according to any one of claims 1 to 4, characterized in that: The second high-voltage driving module includes a second high-voltage PMOS tube and a second high-voltage NMOS tube; the source of the second high-voltage NMOS tube receives the second current, and the drain is connected to the source of the second high-voltage PMOS tube; the drain of the second high-voltage PMOS tube outputs the second output signal; the gates of the second high-voltage PMOS tube and the second high-voltage NMOS tube receive a driving control signal.

9. A CAN transceiver, characterized in that: The CAN transceiver comprises at least: a CAN bus driving circuit as described in any one of claims 1-8.

10. A CAN bus structure, characterized in that: The CAN bus structure at least includes: a CAN controller, a bus and the CAN transceiver as described in claim 9; one end of the CAN transceiver is connected to the CAN controller, and the other end is connected to the bus for transmitting and receiving signals.

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