A CAN transceiver, a motor drive system comprising the transceiver and a vehicle

Abstract

The application discloses a CAN transceiver, a motor drive system comprising the CAN transceiver, and a vehicle comprising the system. The CAN transceiver comprises: a power supply circuit configured to provide a first power supply signal to each module in the transceiver in a starting state; a CAN module configured to receive a control signal from a vehicle CAN bus and start the power supply circuit based on the received control signal; a communication module configured to be woken up to perform a data communication function between the CAN transceiver and other vehicle devices when receiving the first power supply signal from the power supply circuit; and an isolation module configured to perform a voltage isolation operation between the power supply circuit and the communication module.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a CAN transceiver, a motor drive control system including the CAN transceiver, and a vehicle including the system. Background Technology

[0002] CAN bus is widely used in vehicle systems. CAN bus communication is highly susceptible to interference from the external environment. To ensure the reliability of CAN bus communication, electrically isolated CAN transceivers are used. These transceivers effectively reduce the impact of common-mode interference on the CAN bus, thereby improving the reliability of CAN bus communication.

[0003] These types of CAN transceivers require battery power. Typically, even when not transmitting or receiving data, the CAN transceiver remains in normal working order, ready to do so at any time. This undoubtedly increases battery energy consumption, which is unacceptable for vehicles with high energy efficiency requirements. To reduce energy loss, the power supply could be completely cut off or the transceiver could be disabled, but this would risk resulting in the inability to receive bus data. Summary of the Invention

[0004] In view of this, according to a first aspect of the present invention, a CAN transceiver is provided, the CAN transceiver comprising:

[0005] A power supply circuit, which provides a first power signal to each module in the CAN transceiver in the startup state;

[0006] A CAN module, which receives control signals from the vehicle's CAN bus and starts the power circuit based on the received control signals;

[0007] A communication module configured to be woken up upon receiving a first power signal from the power circuit to perform data communication functions between the CAN transceiver and other vehicle equipment; and

[0008] An isolation module is provided for performing voltage isolation between the power supply circuit and the communication module.

[0009] According to an advantageous embodiment, the power supply circuit includes:

[0010] The first enable input port is connected to the CAN module;

[0011] The second enable input port is connected to the vehicle's ignition switch; and

[0012] Power output port,

[0013] The power supply circuit is configured to output a predetermined first power signal via the power output port when a corresponding enable signal is received at the first enable input port and / or the second enable input port.

[0014] According to an advantageous embodiment, the CAN module includes:

[0015] The first power supply port is connected to the power output port of the power supply circuit;

[0016] The control port connects to the vehicle's CAN bus; and

[0017] The enable output port is connected to the first enable input port of the power supply circuit.

[0018] The CAN module is configured to output a corresponding enable signal to the first enable input port via the enable output port based on the control signal received from the control port, so as to start the power circuit.

[0019] According to an advantageous embodiment, the CAN module also includes a second power supply port connected to the vehicle's battery.

[0020] According to an advantageous embodiment, the communication module includes an output port for providing a second power signal, and the isolation module includes a low-voltage port and a high-voltage port, the low-voltage port being connected to the power output port of the power supply circuit to receive a first power signal therefrom, and the high-voltage port being connected to the output port of the communication module to receive a second power signal therefrom.

[0021] The isolation module is configured to perform an isolation conversion operation between the first power signal and the second power signal.

[0022] According to an advantageous embodiment, the CAN module, the communication module, and the isolation module each include a corresponding communication port for data communication between the CAN module and the isolation module and / or between the communication module and the isolation module.

[0023] According to an advantageous embodiment, the power supply circuit includes a low-dropout linear regulator.

[0024] According to a second aspect of the invention, a motor drive control system is also provided, which includes the CAN transceiver described above.

[0025] According to an advantageous embodiment, the motor is a BSG motor.

[0026] According to a third aspect of the invention, a vehicle is also provided, the vehicle including the motor drive control system described above.

[0027] The CAN transceiver according to the present invention has at least one of the following advantages:

[0028] - While meeting the transmission rate of the vehicle's CAN bus, the wake-up function is implemented using the CAN transceiver itself, saving battery energy consumption.

[0029] - It can achieve electrical isolation between the high and low voltage power grids of the vehicle, ensuring the safety of various functional modules inside the vehicle;

[0030] - Eliminating the need for an additional CAN wake-up / isolation chip not only saves costs but also simplifies circuit design; and

[0031] - It has a short wake-up time and low communication latency, enabling fast response in CAN communication. Attached Figure Description

[0032] By incorporating the figures in this article and subsequently the accompanying figures Figure 1 The specific embodiments used to illustrate certain principles of the invention will make other features and advantages of the apparatus and system of the invention clear or more specifically explained.

[0033] Figure 1 A structural diagram of a CAN transceiver according to an exemplary embodiment of the present invention is shown.

[0034] Figure 2 A detailed circuit diagram of a CAN transceiver according to an exemplary embodiment of the present invention is shown. Detailed Implementation

[0035] The CAN transceiver according to the present invention will now be described with reference to the accompanying drawings and embodiments. In the following description, numerous specific details are set forth to enable those skilled in the art to gain a more complete understanding of the invention. However, it will be apparent to those skilled in the art that implementation of the invention may not include some of these specific details. Instead, the invention may be conceived to be practiced with any combination of the following features and elements, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are illustrative only and should not be construed as elements or limitations of the claims.

[0036] The applicant's research found that existing CAN transceivers either have a separate wake-up function or a separate voltage isolation function. If both functions need to be implemented simultaneously, a CAN transceiver with isolation function and a transceiver with CAN wake-up function are required, which results in relatively high costs.

[0037] To address the problems existing in current CAN transceivers, this invention proposes a novel CAN transceiver. Figure 1 An example structural diagram of this novel CAN transceiver according to the present invention is shown.

[0038] like Figure 1 As shown, the CAN transceiver mainly comprises four parts: a power supply circuit 10, a CAN module 20, a communication module 30, and an isolation module 40. The power supply circuit 10 provides corresponding power supply signals (also referred to herein as "first power signals") to each module in the CAN transceiver (e.g., CAN module 20, communication module 30, and isolation module 40) during startup. The CAN module 20 receives control signals from the vehicle's CAN bus and starts the power supply circuit 10 based on the received control signals.

[0039] In other words, under normal conditions, the power supply circuit 10 does not output a power supply signal. Only when a control signal from the vehicle's CAN bus is received will the power supply circuit 10 be triggered / started via the CAN module 20 to supply power to other modules.

[0040] The communication module 30 is configured to be woken up upon receiving a first power signal from the power circuit 10 to perform data communication functions between the CAN transceiver and other vehicle equipment. The isolation module 40 is used to perform voltage isolation between the power circuit 10 and the communication module 30.

[0041] This CAN transceiver can be used, for example, in a 48V BSG (Belt-Driven Starter Generator) device that needs to be connected to both a 12V and a 48V power grid. The power supply circuit 10 is powered by the 12V grid, while the communication module 30 is powered by the 48V system. Because the voltages of the two grids are unbalanced and there is no common ground in the circuit, an isolation module 40 is needed to perform electrical isolation to prevent the 48V high-voltage grid from affecting the 12V low-voltage system and causing it to burn out.

[0042] Furthermore, to meet the system's low power consumption requirements, the BSG can be put into sleep mode, only being woken up via a CAN signal or ignition switch when data communication operations are needed. Figure 1 In the CAN transceiver circuit shown, for example, the 12V low-voltage system of the power supply circuit 10 can be woken up through the pins of the CAN module 20, and then the 48V high-voltage side circuit can be woken up by the power output of the power supply circuit 10, that is, the communication module 30 can be further woken up, thereby achieving the purpose of waking up the entire BSG device.

[0043] Figure 2 A detailed circuit diagram of a CAN transceiver according to an exemplary embodiment of the present invention is shown below. Figure 2 The connection relationship between the various modules in the CAN transceiver according to the present invention will be described.

[0044] The core component IC3 of the power supply circuit 10 can be a low dropout linear regulator IC3 (referred to as "LDO"). This regulator includes an external circuit consisting of C13, C10, C11, C12, D9, D10 and R11. Among them, diode D11 serves as current isolation, and D9, D10 and R11 constitute the enable signal receiving circuit. This enable signal comes from the vehicle KL15 power-on signal on one hand and from the CAN module 20 start signal on the other hand.

[0045] Specifically, the power supply circuit 10 includes a first enable input port INH_LV connected to the CAN module 20, a second enable input port KL15 connected to the vehicle's ignition switch (i.e., for receiving the power-on signal of KL15), and a power output port V_5V_LV. The power supply circuit 10 can be configured to output a predetermined first power signal via the power output port when a corresponding enable signal is received at the first enable input port and / or the second enable input port.

[0046] The CAN module 20 can use the TJA1043 chip, which features two power supply ports. VCC is connected to the power output port V_5V_LV of the power circuit 10, while VBAT is connected to the vehicle KL30 (i.e., the vehicle battery). When the TJA1043 chip enters sleep mode, its INH port outputs a low level. This INH port can be connected to the enable terminal of the power circuit 10 to wake up the power circuit 10.

[0047] See details Figure 2 The CAN module 20 includes: a first power supply port VCC, which is connected to the power output port V_5V_LV of the power supply circuit; control ports CAN_H and CAN_L, which are connected to the vehicle CAN bus; and an enable output port INH, which is connected to the first enable input port INH_LV of the power supply circuit 10. The CAN module can output a corresponding enable signal to the first enable input port INH_LV of the power supply circuit 10 via its enable output port INH based on the control signal received from its control port, thereby activating the power supply circuit to power other modules in the CAN transceiver.

[0048] The isolation module 40 can employ an ISO07221 isolation chip, whose low latency characteristic allows it to meet the baud rate requirements of the CAN signal. Specifically, the communication module 30 may include an output port V_5V for providing a second power signal. The isolation module 40 may also include a low-voltage port VCC1 and a high-voltage port VCC2. The low-voltage port VCC1 is connected to the power output port V_5V_LV of the power circuit 10 to receive the first power signal, and the high-voltage port VCC2 is connected to the output port V_5V of the communication module 30 to receive the second power signal. The isolation module 40 can be used to perform isolation conversion operations between the first power signal and the second power signal.

[0049] In addition, the CAN module 20, the communication module 30, and the isolation module 40 may each include corresponding communication ports TXD / RXD, OUTA / OUTB, and INA / INB for data communication between the CAN module 20 and the isolation module 40 and / or between the communication module 30 and the isolation module 40.

[0050] The CAN transceiver according to the present invention has at least one of the following advantages:

[0051] - While meeting the transmission rate of the vehicle's CAN bus, the wake-up function is implemented using the CAN transceiver itself, saving battery energy consumption.

[0052] - It can achieve electrical isolation between the high and low voltage power grids of the vehicle, ensuring the safety of various functional modules inside the vehicle;

[0053] - Eliminating the need for an additional CAN wake-up / isolation chip not only saves costs but also simplifies circuit design; and

[0054] - It has a short wake-up time and low communication latency, enabling fast response in CAN communication.

[0055] In this invention, the term "connection" may refer to "electrical connection" or "communication connection." Furthermore, terms such as "comprising" and "including" indicate that, in addition to the elements directly and explicitly stated in the specification and claims, the technical solution of this application does not exclude the presence of other elements not directly or explicitly stated. Moreover, terms such as "first" and "second" do not indicate the order of components or values ​​in time, space, size, etc., but are merely used to distinguish the various components or values.

[0056] In this invention, those skilled in the art will understand that the disclosed system can be implemented in other ways. The system implementation methods described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, the functions of multiple modules can be combined, or the function of a certain module can be further split. In the various embodiments of this invention, each module can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit.

[0057] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. All modifications and alterations made without departing from the spirit and scope of the invention should be included within the scope of protection of the invention. Therefore, the scope of protection of the invention should be determined by the scope defined in the claims.

Claims

1. A CAN transceiver, characterized in that, The CAN transceiver includes: Power supply circuit (10), which is used to provide a first power signal to each module in the CAN transceiver in the startup state; CAN module (20), the CAN module is used to receive control signals from the vehicle CAN bus and start the power circuit based on the received control signals; Communication module (30), configured to be woken up upon receiving a first power signal from the power circuit to perform data communication functions between the CAN transceiver and other vehicle equipment; and An isolation module (40) is used to perform voltage isolation between the power supply circuit and the communication module, wherein, The power supply circuit (10) includes a power output port (V_5V_LV) for providing a first power signal. The communication module (30) includes an output port (V_5V) for providing a second power signal. The isolation module (40) includes a low-voltage port (VCC1) and a high-voltage port (VCC2). The low-voltage port (VCC1) is connected to the power output port (V_5V_LV) of the power supply circuit (10) to receive a first power signal therefrom. The high-voltage port (VCC2) is connected to the output port (V_5V) of the communication module (30) to receive a second power signal therefrom. The isolation module (40) is configured to perform an isolation conversion operation between the first power signal and the second power signal.

2. The CAN transceiver according to claim 1, characterized in that, The power supply circuit (10) also includes: The first enable input port (INH_LV) is connected to the CAN module (20); The second enable input port (KL15) is connected to the vehicle's ignition switch. The power supply circuit (10) is configured to output a predetermined first power signal via the power output port when the first enable input port and / or the second enable input port receive a corresponding enable signal.

3. The CAN transceiver according to claim 2, characterized in that, The CAN module (20) includes: The first power supply port (VCC) is connected to the power output port (V_5V_LV) of the power supply circuit. Control ports (CAN_H, CAN_L) connect to the vehicle's CAN bus; and Enable output port (INH), which is connected to the first enable input port (INH_LV) of the power supply circuit (10). The CAN module is configured to output a corresponding enable signal to the first enable input port (INH_LV) via the enable output port (INH) based on the control signal received by the control port, so as to start the power circuit.

4. The CAN transceiver according to claim 3, characterized in that, The CAN module (20) also includes a second power supply port (VBAT) connected to the vehicle battery.

5. The CAN transceiver according to claim 1, characterized in that, The CAN module (20), the communication module (30), and the isolation module (40) each include a corresponding communication port for data communication between the CAN module (20) and the isolation module (40) and / or between the communication module (30) and the isolation module (40).

6. The CAN transceiver according to any one of claims 1 to 5, characterized in that, The power supply circuit (10) includes a low-dropout linear regulator.

7. A motor drive control system, characterized in that, The system includes a CAN transceiver according to any one of claims 1 to 6.

8. The motor drive control system according to claim 7, characterized in that, The motor is a BSG motor.

9. A vehicle, characterized in that, The vehicle includes the motor drive control system according to claim 7 or 8.

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