A CAN wake-up circuit, domain controller and vehicle

Abstract

The present invention discloses a CAN wake-up circuit, a domain controller and a vehicle, wherein the CAN wake-up circuit includes a CAN transceiver circuit, a wake-up circuit and a main control circuit; the CAN transceiver circuit is used to receive a specific frame CAN message to wake up from a sleep state, and output a wake-up signal through an output end according to the received specific frame CAN message; the wake-up circuit is used to output a power signal for power supply according to the input wake-up signal; the input end of the main control circuit is connected to the output end of the wake-up circuit, and the wake-up circuit outputs a power signal to power the main control circuit; the output end of the main control circuit is connected to the control end of the CAN transceiver circuit, and the main control circuit is used to output a sleep signal to control the CAN transceiver circuit to enter a sleep state. The CAN wake-up circuit provided by the present invention is awakened by receiving a specific frame message and enters a sleep state through the main control circuit, thereby shortening the wake-up time and reducing the static current in the sleep state.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a CAN wake-up circuit, a domain controller and a vehicle. Background Art

[0002] The electrical equipment in the car has a great impact on the battery consumption. In order to manage the use of the battery intelligently, it is necessary to manage the low power consumption of each electrical equipment.

[0003] Currently, low-power management and wake-up methods of batteries generally require controlling the domain controller through a key switch, and different devices require different wake-up circuits for wake-up.

[0004] However, the low power consumption and wake-up method of the battery in the prior art results in a large static current in the vehicle standby mode, and the battery is consumed too quickly. Summary of the invention

[0005] The present invention provides a CAN wake-up circuit, a domain controller and a vehicle to solve the problems of large static current and excessive battery consumption in the vehicle standby mode in the prior art.

[0006] According to one aspect of the present invention, a CAN wake-up circuit is provided, the circuit comprising: a CAN transceiver circuit, a wake-up circuit and a main control circuit;

[0007] The input end of the CAN transceiver circuit receives a specific frame CAN message, and the CAN transceiver circuit is used to wake up from a dormant state according to the received specific frame CAN message, and output a wake-up signal through the output end according to the received specific frame CAN message;

[0008] The input end of the wake-up circuit is connected to the output end of the CAN transceiver circuit, and the wake-up circuit is used to output a power signal for power supply according to the input wake-up signal;

[0009] The input end of the main control circuit is connected to the output end of the wake-up circuit, and the wake-up circuit outputs a power signal to power the main control circuit; the output end of the main control circuit is connected to the control end of the CAN transceiver circuit, and the main control circuit is used to output a sleep signal to control the CAN transceiver circuit to enter a sleep state.

[0010] Among them, the explicit time of the specific frame CAN message is not less than the first time threshold, the implicit time is not less than the second time threshold, and the entire specific frame wake-up time is not greater than the third time threshold.

[0011] Optionally, the first time threshold is 0.75 μs, the second time threshold is 0.75 μs, and the third time threshold is 2 ms.

[0012] Optionally, the CAN transceiver circuit includes a CAN transceiver, a first capacitor, a first resistor module, a second resistor module, a third resistor module, a fourth resistor module and a first inductor; the CAN transceiver is connected to one end of the first resistor module, and the other end of the first resistor module is connected to the control end of the CAN transceiver circuit, the CAN transceiver is connected to one end of the first inductor, and the other end of the first inductor is connected to the input end of the CAN transceiver circuit, and the CAN transceiver outputs a wake-up signal according to the received specific frame CAN message; the CAN transceiver is connected to one end of the second resistor module, and the other end of the second resistor module is connected to one end of the third resistor module, one end of the fourth resistor module and one end of the first capacitor, the other end of the first capacitor is grounded, and the other end of the third resistor module and the other end of the fourth resistor module are connected to the input end of the CAN transceiver circuit.

[0013] Optionally, the third resistor module and the fourth resistor module are used as terminal resistors to stabilize the specific frame CAN message signal received by the CAN transceiver.

[0014] Optionally, the wake-up circuit includes a first switch module and a second switch module; the input end of the first switch module is connected to the input end of the wake-up circuit, the output end of the first switch module is connected to the control end of the second switch module, the input end of the second switch module is connected to the first power supply, and the output end of the second switch module is connected to the output end of the wake-up circuit.

[0015] Optionally, the first switch module includes a first MOS tube, a fifth resistor module, a sixth resistor module, a first diode, a second diode and a second capacitor; the gate of the first MOS tube is connected to one end of the fifth resistor module, one end of the second capacitor, the cathode of the first diode and the cathode of the second diode, the anode of the second diode is connected to one end of the sixth resistor module, the other end of the sixth resistor module is connected to the input end of the first switch module, the other end of the fifth resistor module, the other end of the second capacitor and the anode of the first diode are grounded, the source of the first MOS tube is grounded, and the drain of the first MOS tube is connected to the output end of the first switch module.

[0016] Optionally, the first MOS transistor includes an N-type MOS transistor.

[0017] Optionally, the second switch module includes a second MOS tube, a seventh resistor module, an eighth resistor module, a third diode, a third capacitor and a fourth capacitor; the gate of the second MOS tube is connected to one end of the seventh resistor module, the anode of the third diode and one end of the eighth resistor module, the other end of the seventh resistor module is connected to the control end of the second switch module, the source of the second MOS tube is connected to the anode of the third diode and the other end of the eighth resistor module and then to the input end of the second switch module, the drain of the second MOS tube is connected to the output end of the second switch module, one end of the third capacitor and one end of the fourth capacitor, and the other end of the third capacitor and the other end of the fourth capacitor are grounded.

[0018] Optionally, the second MOS tube includes a P-type MOS tube.

[0019] According to another aspect of the present invention, a domain controller is provided, and the domain controller includes the CAN wake-up circuit.

[0020] According to another aspect of the present invention, a vehicle is provided, comprising the domain controller.

[0021] The technical solution of the embodiment of the present invention provides a CAN wake-up circuit including a CAN transceiver circuit, a wake-up circuit and a main control circuit; the CAN transceiver circuit is used to receive a specific frame CAN message to wake up from the sleep state, and output a wake-up signal through the output end according to the received specific frame CAN message; the wake-up circuit is used to output a power signal for power supply according to the input wake-up signal; the input end of the main control circuit is connected to the output end of the wake-up circuit, and the wake-up circuit outputs a power signal to power the main control circuit; the output end of the main control circuit is connected to the control end of the CAN transceiver circuit, and the main control circuit is used to output a sleep signal to control the CAN transceiver circuit to enter the sleep state. The CAN wake-up circuit provided by the present invention is awakened by receiving a specific frame message and enters the sleep state through the main control circuit, which shortens the wake-up time and reduces the static current in the sleep state, solving the problem of large static current and excessive battery consumption in the vehicle standby mode in the prior art.

[0022] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a CAN wake-up circuit provided by an embodiment of the present invention;

[0025] Figure 2 It is a level logic schematic diagram of a CAN message provided by an embodiment of the present invention;

[0026] Figure 3 It is a timing diagram of a specific frame CAN message provided by an embodiment of the present invention;

[0027] Figure 4 is a circuit diagram of a CAN transceiver circuit provided by an embodiment of the present invention;

[0028] Figure 5 This is a CAN message waveform diagram provided by an embodiment of the present invention when no terminal resistor is added;

[0029] Figure 6 This is a waveform diagram of a CAN message after adding a terminal resistor provided by an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of the structure of a wake-up circuit provided by an embodiment of the present invention;

[0031] Figure 8 is a circuit diagram of a first switch module provided in an embodiment of the present invention;

[0032] Fig. 9 is a circuit diagram of connecting a second switch module and a first switch module provided by an embodiment of the present invention;

[0033] Fig.10 is a circuit diagram of a main control circuit provided by an embodiment of the present invention;

[0034] Fig.11 It is a schematic diagram of the structure of a domain controller provided by an embodiment of the present invention;

[0035] Fig.12 It is a structural schematic diagram of a vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" 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.

[0038] Embodiment 1

[0039] Figure 1 is a schematic diagram of the structure of a CAN wake-up circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the CAN wake-up circuit 100 includes a CAN transceiver circuit 110, a wake-up circuit 120 and a main control circuit 130; the input terminal a1 of the CAN transceiver circuit 110 receives a specific frame CAN message, and the CAN transceiver circuit 110 is used to wake up from the sleep state according to the received specific frame CAN message, and output a wake-up signal through the output terminal b1 according to the received specific frame CAN message; the input terminal a2 of the wake-up circuit 120 is connected to the output terminal b1 of the CAN transceiver circuit 110, and the wake-up circuit 120 is used to output a power signal for power supply according to the input wake-up signal; the input terminal a3 of the main control circuit 130 is connected to the output terminal b2 of the wake-up circuit 120, and the wake-up circuit 120 outputs a power signal to power the main control circuit 130; the output terminal b3 of the main control circuit 130 is connected to the control terminal a4 of the CAN transceiver circuit 110, and the main control circuit 130 is used to output a sleep signal to control the CAN transceiver circuit 110 to enter the sleep state. Among them, the explicit time of the specific frame CAN message is not less than the first time threshold, the implicit time is not less than the second time threshold, and the entire specific frame wake-up time is not greater than the third time threshold.

[0040] In this embodiment, the CAN wake-up circuit is a circuit that wakes up the power signal according to the received CAN message, and the CAN transceiver circuit includes a CAN transceiver for receiving the CAN message and sending a wake-up signal. The wake-up circuit is a circuit for executing the power signal wake-up, and the main control circuit includes a main control chip, which can output a sleep signal according to the vehicle operation state. The explicitness and implicitness of the CAN message are two complementary logical values ​​specified in the CAN2.0B specification. When the CAN message transmits the explicit state bit and the implicit state bit at the same time, the CAN message is in the explicit state. When the CAN message transmits the explicit state bit at the same time, the CAN message is in the explicit state. When the CAN message transmits the implicit state bit at the same time, the CAN message is in the implicit state. For example, the explicit value is represented by a logical 0, and the implicit value is represented by a logical 1. Figure 2 : is a level logic diagram of a CAN message provided by an embodiment of the present invention, such as Figure 2 As shown in the figure, when the CAN message is recessive (logic 1), the levels of CAN_H and CAN_L are both 2.5V (potential difference is 0V); when the CAN bus is dominant (logic 0), the levels of CAN_H and CAN_L are 3.5V and 1.5V respectively (potential difference is 2.0V). A specific frame CAN message refers to a CAN message whose dominant time is not less than the first time threshold, whose recessive time is not less than the second time threshold, and whose entire specific frame wake-up time is not greater than the third time threshold.

[0041] After the vehicle is powered on, when the CAN transceiver circuit 110 receives a specific frame CAN message, the CAN transceiver circuit 110 sends a wake-up signal, the wake-up circuit 120 receives the wake-up signal and wakes up the output power signal, and the main control circuit 130 works normally according to the received power signal. When the vehicle is powered off, the main control circuit 130 outputs a sleep signal, and the CAN transceiver circuit 110 enters a sleep state according to the received sleep signal.

[0042] The technical solution of this embodiment provides a CAN wake-up circuit including a CAN transceiver circuit, a wake-up circuit and a main control circuit; the CAN transceiver circuit is used to receive a specific frame CAN message to wake up from the sleep state, and output a wake-up signal through the output end according to the received specific frame CAN message; the wake-up circuit is used to output a power signal for power supply according to the input wake-up signal; the input end of the main control circuit is connected to the output end of the wake-up circuit, and the wake-up circuit outputs a power signal to power the main control circuit; the output end of the main control circuit is connected to the control end of the CAN transceiver circuit, and the main control circuit is used to output a sleep signal to control the CAN transceiver circuit to enter the sleep state. The CAN wake-up circuit provided by the present invention wakes up by receiving a specific frame message and enters the sleep state through the main control circuit, which shortens the wake-up time and reduces the static current in the sleep state, solving the problem of large static current and excessive battery consumption in the vehicle standby mode in the prior art.

[0043] On the basis of the above embodiment, this embodiment limits the specific frame CAN message, and illustratively, the first time threshold is 0.75μs, the second time threshold is 0.75μs, and the third time threshold is 2ms. That is, the explicit time of the specific frame CAN message is not less than 0.75μs, the implicit time of the specific frame CAN message is not less than 0.75μs, and the entire specific frame wake-up time is not more than 2ms. Figure 3 is a timing diagram of a specific frame CAN message provided by an embodiment of the present invention, such as Figure 3 As shown, the first time threshold is t wake(busdom) The second time threshold is represented by t wake(busrec) The third time threshold is t to(wake)bus express.

[0044] Figure 4 is a circuit diagram of a CAN transceiver circuit provided by an embodiment of the present invention, such as Figure 4 As shown, the CAN transceiver circuit 110 includes a CAN transceiver U1, a first capacitor C1, a first resistor module R1, a second resistor module R2, a third resistor module R3, a fourth resistor module R4 and a first inductor L1; the CAN transceiver U1 is connected to one end of the first resistor module R1, the other end of the first resistor module R1 is connected to the control end a4 of the CAN transceiver circuit 110, the CAN transceiver U1 is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to the input end a1 of the CAN transceiver circuit 110, and the CAN transceiver U1 outputs a wake-up signal according to the received specific frame CAN message; the CAN transceiver U1 is connected to one end of the second resistor module R2, the other end of the second resistor module R2 is connected to one end of the third resistor module R3, one end of the fourth resistor module R4 and one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, and the other end of the third resistor module R3 and the other end of the fourth resistor module R4 are connected to the input end a1 of the CAN transceiver circuit 110.

[0045] In this embodiment, the CAN message communication input by the input terminal a1 of the CAN transceiver circuit 110 includes two communication modes: CAN high (CAN_H) and CAN low (CAN_L). The other end of the third resistor module R3 is connected to CAN_H, and the other end of the fourth resistor module R4 is connected to CAN_L. The CAN transceiver circuit 110 also includes a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7. The CAN transceiver U1 is connected to the first power supply V1 through the fifth capacitor C5 in series, the CAN transceiver U1 is connected to the second power supply V2 through the sixth capacitor C6 in series, and the CAN transceiver U1 is connected to the third power supply V3 through the seventh capacitor C7 in series. The fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are all used as filter capacitors. The first power supply V1 is a 12V voltage source, the second power supply V2 is a 5V voltage source, and the third power supply V3 is a 3.3V voltage source. The CAN transceiver circuit 110 also includes a ninth resistor module R9, a tenth resistor module R10, and an eleventh resistor module R11.

[0046] The CAN transceiver U1 is TJA1043TK, which is compatible with vehicles with 12V and 24V systems and is widely used for CAN wake-up in different vehicles. The voltage range that the dedicated pin of the battery working mode of the CAN transceiver U1 can withstand is V BAT As shown in Table 1.

[0047] Table 1

[0048]

[0049] In this embodiment, the third resistor module R3 and the fourth resistor module R4 are used as terminal resistors to stabilize the specific frame CAN message signal received by the CAN transceiver U1. The third resistor module R3 and the fourth resistor module R4 use a 60.4Ω resistor, which is suitable for long-distance transmission of CAN messages. Exemplarily, when a dominant bit is sent to a network containing at least one CAN driver in an on state, it means that a current passes through the terminal resistor, so CANH and CANL have different voltage values. In the dominant state, the terminal resistor will stabilize and enhance the differential voltage. When one or two terminal resistors are removed, the CAN signal will be unstable and the differential voltage will also change. Two 60.4 ohm resistors are reserved in the circuit, and their function is to absorb the reflection and echo of the signal. When the CAN high-speed signal is transmitted, the signal wavelength is shorter than the transmission line, and the signal will form a reflected wave at the terminal of the transmission line, interfering with the original signal, so it is necessary to add a terminal resistor at the end of the transmission line so that the signal does not reflect after reaching the end of the transmission line. Figure 5 CAN message waveform diagram without terminal resistance provided by the embodiment of the present invention, Figure 6 CAN message waveform diagram after adding terminal resistance provided by the embodiment of the present invention. Figure 5 , Figure 6As shown in the figure, after adding two terminal resistors R3 and R4, the signal waveform of the CAN message is significantly improved and the ringing reflection disappears.

[0050] Figure 7 is a schematic diagram of the structure of the wake-up circuit provided by an embodiment of the present invention, such as Figure 7 As shown, the wake-up circuit 120 includes a first switch module 710 and a second switch module 720; an input terminal a71 of the first switch module 710 is connected to an input terminal a2 of the wake-up circuit 120, an output terminal b71 of the first switch module 710 is connected to a control terminal a72 of the second switch module 720, an input terminal a73 of the second switch module 720 is connected to a first power source V1, and an output terminal b72 of the second switch module 720 is connected to an output terminal b2 of the wake-up circuit 120. The first switch module 710 is connected to the CAN transceiver circuit 110 and is used to receive a wake-up signal. The first switch module 710 outputs a switch signal according to the received wake-up signal. The second switch module 720 wakes up the first power source V1 connected to the input terminal according to the received switch signal, and outputs a power signal through the output terminal.

[0051] Figure 8 is a circuit diagram of a first switch module provided in an embodiment of the present invention, such as Figure 8 As shown, the first switch module 710 includes a first MOS transistor Q1, a fifth resistor module R5, a sixth resistor module R6, a first diode D1, a second diode D2, and a second capacitor C2; the gate of the first MOS transistor Q1 is connected to one end of the fifth resistor module R5, one end of the second capacitor C2, the cathode of the first diode D1, and the cathode of the second diode D2; the anode of the second diode D2 is connected to one end of the sixth resistor module R6; the other end of the sixth resistor module R6 is connected to the input end a71 of the first switch module 710; the other end of the fifth resistor module R5, the other end of the second capacitor C2, and the anode of the first diode D1 are grounded; the source of the first MOS transistor Q1 is grounded; and the drain of the first MOS transistor Q1 is connected to the output end b71 of the first switch module 710. Among them, the first MOS transistor Q1 includes an N-type MOS transistor, and the first diode D1 and the second diode D2 are voltage-stabilizing diodes.

[0052] Fig. 9 1 is a circuit diagram of the second switch module connected to the first switch module provided in an embodiment of the present invention, that is, a circuit diagram of the wake-up circuit 120, such as Fig. 9As shown, the second switch module 720 includes a second MOS transistor Q2, a seventh resistor module R7, an eighth resistor module R8, a third diode D3, a third capacitor C3 and a fourth capacitor C4; the gate of the second MOS transistor Q2 is connected to one end of the seventh resistor module R7, the anode of the third diode D3 and one end of the eighth resistor module R8, the other end of the seventh resistor module R7 is connected to the control end a72 of the second switch module 720, the source of the second MOS transistor Q2 is connected to the cathode of the third diode D3 and the other end of the eighth resistor module R8 and then connected to the input end a73 of the second switch module 720, the drain of the second MOS transistor Q2 is connected to the output end b72 of the second switch module 720, one end of the third capacitor C3 and one end of the fourth capacitor C4, and the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are grounded. Among them, the second MOS transistor Q2 includes a P-type MOS transistor, and the third diode D3 is a voltage regulator diode.

[0053] Fig.10 is a circuit diagram of a main control circuit provided by an embodiment of the present invention, such as Fig.10 As shown, the main control circuit 130 includes a control unit MCU chip U2, the model of U2 is TC397XP-256F300S, and the Y10 pin of U2 is connected to the output terminal b3 of the main control circuit 130, which is used to output a sleep signal to control the CAN transceiver circuit 110 to enter a sleep state.

[0054] refer to Figure 4 , Figure 8 , Fig. 9 and Fig.10In this embodiment, when the vehicle is powered on and started, the first power source V1 is normally powered, and the CAN transceiver U1 receives a specific frame CAN message sent by the vehicle. At this time, the INH state of the 7th pin of the CAN transceiver U1 changes from suspended to high level, and the network SIG_CAN0_WAKEUP connected to the 7th pin of the CAN transceiver U1 also changes from suspended to high level. SIG_CAN0_WAKEUP triggers the conduction of the first MOS tube Q1 after passing through the sixth resistor module R6 and the second diode D2. The conduction of the first MOS tube Q1 then triggers the conduction of the second MOS tube Q2, so that the second MOS tube Q2 outputs a power signal, and the power signal output by the second MOS tube Q2 supplies power to the entire system. When the Y10 pin INH of the MCU chip U2 outputs a low level, CAN0_AURIX_1043_STB is at a low level. Since CAN0_AURIX_1043_STB is connected to the control terminal a4 of the CAN transceiver circuit, the CAN transceiver U1 enters the standby mode. At this time, the 7-pin INH output of the CAN transceiver U1 is at a high level. The CAN transceiver U1 enters the sleep mode 35us after entering the standby mode. At this time, the 7-pin INH output of the CAN transceiver U1 is suspended. The network SIG_CAN0_WAKEUP connected to the 7-pin INH of the CAN transceiver U1 is also suspended, the first MOS tube Q1 is turned off, and then the second MOS tube Q2 is also turned off, so that the second MOS tube Q2 cannot output the power signal, and the entire system program stops running.

[0055] Fig.11 is a schematic diagram of the structure of a domain controller provided by an embodiment of the present invention, such as Fig.11 As shown, the domain controller 11 includes a CAN wake-up circuit 100 , and the domain controller 11 also includes an electronic control unit 111 .

[0056] In this embodiment, the domain controller 11 can solve the problems of information security and the increase of electronic control units (ECUs) and limited communication capabilities. The domain refers to the functional domain, which is divided into powertrain, body control and other aspects. In each domain, the domain controller is equivalent to a high-performance ECU, which is responsible for processing the functional control and forwarding within the domain. The CAN wake-up circuit 100 is applied to the domain controller 11. When the CAN wake-up circuit is in the awake state, the entire system program can run and the domain controller can work normally. When the CAN wake-up circuit is in the dormant state, the entire system program also stops running, and the domain controller is in a low-power mode. At this time, the static current of the domain controller is the smallest, which reduces the use of the battery and improves the battery life.

[0057] Fig.12 is a schematic diagram of the structure of a vehicle provided by an embodiment of the present invention, such as Fig.12As shown, the vehicle 12 includes a domain controller 11, and the vehicle 12 also includes an on-board device 121. The domain controller 11 controls the on-board device 121 to perform corresponding actions according to the received signal.

[0058] In this embodiment, the domain controller 11 including the CAN wake-up circuit 100 is applied to the vehicle. When the CAN wake-up circuit is in the awake state, the entire system program can run, the domain controller can work normally, and the vehicle can work normally. When the CAN wake-up circuit is in the dormant state, the entire system program also stops running, the domain controller is in a low power consumption mode, and the vehicle is in a standby mode. At this time, the static current of the vehicle is minimal, avoiding the risk of battery power being exhausted due to the long parking time of the vehicle. The domain controller of the vehicle uses the CAN wake-up circuit to wake up the power supply, reducing the wake-up circuits between different devices, shortening the wake-up time and reducing the cost of the vehicle.

[0059] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0060] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A CAN wake-up circuit, It is characterized in that include: CAN transceiver circuit, wake-up circuit and main control circuit; The input end of the CAN transceiver circuit receives a specific frame CAN message, and the CAN transceiver circuit is used to wake up from a dormant state according to the received specific frame CAN message, and output a wake-up signal through the output end according to the received specific frame CAN message; The input end of the wake-up circuit is connected to the output end of the CAN transceiver circuit, and the wake-up circuit is used to output a power signal for power supply according to the input wake-up signal; The input end of the main control circuit is connected to the output end of the wake-up circuit, and the wake-up circuit outputs a power supply signal to power the main control circuit; the output end of the main control circuit is connected to the control end of the CAN transceiver circuit, and the main control circuit is used to output a sleep signal to control the CAN transceiver circuit to enter a sleep state; Wherein, the explicit time of the specific frame CAN message is not less than the first time threshold, the implicit time is not less than the second time threshold, and the entire specific frame wake-up time is not greater than the third time threshold; The wake-up circuit includes a first switch module and a second switch module; the input end of the first switch module is connected to the input end of the wake-up circuit, the output end of the first switch module is connected to the control end of the second switch module, the input end of the second switch module is connected to the first power supply, and the output end of the second switch module is connected to the output end of the wake-up circuit; wherein, the first switch module is connected to the CAN transceiver circuit for receiving a wake-up signal, the first switch module outputs a switch signal according to the received wake-up signal, and the second switch module wakes up the first power supply connected to the input end according to the received switch signal, and outputs a power signal through the output end.

2. The CAN wake-up circuit according to claim 1, It is characterized in that The first time threshold is 0.75 μs, the second time threshold is 0.75 μs, and the third time threshold is 2 ms.

3. The CAN wake-up circuit according to claim 1, It is characterized in that The CAN transceiver circuit includes a CAN transceiver, a first capacitor, a first resistor module, a second resistor module, a third resistor module, a fourth resistor module and a first inductor; the CAN transceiver is connected to one end of the first resistor module, the other end of the first resistor module is connected to the control end of the CAN transceiver circuit, the CAN transceiver is connected to one end of the first inductor, the other end of the first inductor is connected to the input end of the CAN transceiver circuit, and the CAN transceiver outputs a wake-up signal according to the received specific frame CAN message; the CAN transceiver is connected to one end of the second resistor module, the other end of the second resistor module is connected to one end of the third resistor module, one end of the fourth resistor module and one end of the first capacitor, the other end of the first capacitor is grounded, and the other end of the third resistor module and the other end of the fourth resistor module are connected to the input end of the CAN transceiver circuit.

4. The CAN wake-up circuit according to claim 3, It is characterized in that The third resistor module and the fourth resistor module are used as terminal resistors to stabilize the specific frame CAN message signal received by the CAN transceiver.

5. The CAN wake-up circuit according to claim 1, It is characterized in that The first switch module includes a first MOS tube, a fifth resistor module, a sixth resistor module, a first diode, a second diode and a second capacitor; the gate of the first MOS tube is connected to one end of the fifth resistor module, one end of the second capacitor, a cathode of the first diode and a cathode of the second diode, the anode of the second diode is connected to one end of the sixth resistor module, the other end of the sixth resistor module is connected to the input end of the first switch module, the other end of the fifth resistor module, the other end of the second capacitor and the anode of the first diode are grounded, the source of the first MOS tube is grounded, and the drain of the first MOS tube is connected to the output end of the first switch module.

6. The CAN wake-up circuit according to claim 5, It is characterized in that The first MOS transistor comprises an N-type MOS transistor.

7. The CAN wake-up circuit according to claim 5, It is characterized in that The second switch module includes a second MOS tube, a seventh resistor module, an eighth resistor module, a third diode, a third capacitor and a fourth capacitor; the gate of the second MOS tube is connected to one end of the seventh resistor module, the anode of the third diode and one end of the eighth resistor module, the other end of the seventh resistor module is connected to the control end of the second switch module, the source of the second MOS tube is connected to the cathode of the third diode and the other end of the eighth resistor module and then to the input end of the second switch module, the drain of the second MOS tube is connected to the output end of the second switch module, one end of the third capacitor and one end of the fourth capacitor, and the other end of the third capacitor and the other end of the fourth capacitor are grounded.

8. The CAN wake-up circuit according to claim 7, It is characterized in that The second MOS tube includes a P-type MOS tube.

9. A domain controller, It is characterized in that The CAN wake-up circuit comprises the CAN wake-up circuit as described in any one of claims 1 to 8.

10. A vehicle, It is characterized in that Includes the domain controller described in claim 9.

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