CN116094857A - CAN wake-up circuit, domain controller and vehicle - Google Patents

CAN wake-up circuit, domain controller and vehicle Download PDF

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Publication number
CN116094857A
CN116094857A CN202211525015.0A CN202211525015A CN116094857A CN 116094857 A CN116094857 A CN 116094857A CN 202211525015 A CN202211525015 A CN 202211525015A CN 116094857 A CN116094857 A CN 116094857A
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China
Prior art keywords
circuit
wake
module
transceiver
capacitor
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CN202211525015.0A
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Chinese (zh)
Inventor
李现管
刘爱文
杨昆
杨永勋
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Suzhou Zhitu Technology Co Ltd
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Suzhou Zhitu Technology Co Ltd
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Priority to CN202211525015.0A priority Critical patent/CN116094857A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
    • B60R16/0236—Circuits relating to the driving or the functioning of the vehicle for economical driving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40267—Bus for use in transportation systems
    • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Transceivers (AREA)

Abstract

The invention discloses a CAN wake-up circuit, a domain controller and a vehicle, wherein the CAN wake-up circuit comprises a CAN transceiver circuit, a wake-up circuit and a main control circuit; the CAN transceiver circuit is used for receiving the CAN message of the specific frame to wake up from the dormant state and outputting a wake-up signal through the output end according to the received CAN message of the specific frame; the wake-up circuit is used for outputting a power supply signal according to the input wake-up signal so as to supply power; the input end of the main control circuit is connected with the output end of the wake-up circuit, and the wake-up circuit outputs a power supply signal to supply power for the main control circuit; the output end of the main control circuit is connected with the control end of the CAN transceiver circuit, and the main control circuit is used for outputting a sleep signal to control the CAN transceiver circuit to enter a sleep state. The CAN wake-up circuit provided by the invention wakes up by receiving the specific frame message and enters the sleep state through the main control circuit, so that the wake-up time is shortened, and the quiescent current in the sleep state is reduced.

Description

CAN wake-up circuit, domain controller and vehicle
Technical Field
The invention relates to the technical field of battery management, in particular to a CAN wake-up circuit, a domain controller and a vehicle.
Background
The electric devices on the automobile have large battery loss, and in order to intelligently manage the use of the battery, it is necessary to manage each electric device with low power consumption.
Currently, low power management and wake-up modes of a battery generally require a domain controller to be controlled through a key switch, and different devices require different wake-up circuits to wake up.
However, the low power consumption and wake-up mode of the battery in the prior art causes a larger quiescent current in the standby mode of the vehicle, and the battery consumes too fast.
Disclosure of Invention
The invention provides a CAN wake-up circuit, a domain controller and a vehicle, which are used for solving the problems of larger quiescent current and excessively high power consumption of a battery in a vehicle standby mode in the prior art.
According to an aspect of the present invention, there is provided a CAN wake-up circuit comprising: the CAN transceiver circuit, the wake-up circuit and the main control circuit;
the CAN transceiver circuit is used for waking up from a dormant state according to the received CAN message with the specific frame and outputting a wake-up signal through an output end according to the received CAN message with the specific frame;
the input end of the wake-up circuit is connected with the output end of the CAN transceiver circuit, and the wake-up circuit is used for outputting a power supply signal according to the input wake-up signal so as to supply power;
the input end of the main control circuit is connected with the output end of the wake-up circuit, and the wake-up circuit outputs a power supply signal to supply power for the main control circuit; the output end of the main control circuit is connected with the control end of the CAN transceiver circuit, and the main control circuit is used for outputting a sleep signal to control the CAN transceiver circuit to enter a sleep state.
Wherein the dominant time of the CAN message of the specific frame is not less than a first time threshold, the recessive time is not less than a second time threshold, and the whole wake-up time of the specific frame is not greater than a third time threshold.
Optionally, the first time threshold is 0.75 μs, the second time threshold is 0.75 μs, and the third time threshold is 2ms.
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 with one end of the first resistor module, the other end of the first resistor module is connected with the control end of the CAN transceiver circuit, the CAN transceiver is connected with one end of the first inductor, the other end of the first inductor is connected with the input end of the CAN transceiver circuit, and the CAN transceiver outputs a wake-up signal according to a received CAN message of a specific frame; the CAN transceiver is connected with one end of the second resistor module, the other end of the second resistor module is connected with 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 with the input end of the CAN transceiver circuit.
Optionally, the third resistor module and the fourth resistor module are used as terminal resistors to stabilize the CAN message signal of the specific frame received by the CAN transceiver.
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 with the input end of the wake-up circuit, the output end of the first switch module is connected with the control end of the second switch module, the input end of the second switch module is connected with a first power supply, and the output end of the second switch module is connected with the output end of the wake-up circuit.
Optionally, the first switch module includes a first MOS transistor, a fifth resistor module, a sixth resistor module, a first diode, a second diode, and a second capacitor; the grid of first MOS pipe is connected one end of fifth resistance module, the one end of second electric capacity, the negative pole of first diode with the negative pole of second diode, the positive pole of second diode is connected one end of sixth resistance module, the other end of sixth resistance module is connected the input of first switch module, the other end of fifth resistance module, the other end of second electric capacity and the positive pole of first diode ground connection, the source ground of first MOS pipe, the drain electrode of first MOS pipe is connected the output of first switch module.
Optionally, the first MOS transistor includes an N-type MOS transistor.
Optionally, the second switch module includes a second MOS transistor, a seventh resistor module, an eighth resistor module, a third diode, a third capacitor, and a fourth capacitor; the grid electrode of the second MOS tube is connected with one end of the seventh resistance module, the anode of the third diode and one end of the eighth resistance module, the other end of the seventh resistance module is connected with the control end of the second switch module, the source electrode of the second MOS tube is connected with the anode of the third diode and the other end of the eighth resistance module and then connected with the input end of the second switch circuit, the drain electrode of the second MOS tube is connected with 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.
Optionally, the second MOS transistor includes a P-type MOS transistor.
According to another aspect of the present invention, there is provided a domain controller comprising the CAN wake-up circuit.
According to another aspect of the present invention, there is provided a vehicle including the domain controller.
According to the technical scheme provided by the embodiment of the invention, the CAN wake-up circuit comprises a CAN transceiver circuit, a wake-up circuit and a main control circuit; the CAN transceiver circuit is used for receiving the CAN message of the specific frame to wake up from the dormant state and outputting a wake-up signal through the output end according to the received CAN message of the specific frame; the wake-up circuit is used for outputting a power supply signal according to the input wake-up signal so as to supply power; the input end of the main control circuit is connected with the output end of the wake-up circuit, and the wake-up circuit outputs a power supply signal to supply power for the main control circuit; the output end of the main control circuit is connected with the control end of the CAN transceiver circuit, and the main control circuit is used for outputting a sleep signal to control the CAN transceiver circuit to enter a sleep state. The CAN wake-up circuit provided by the invention wakes up by receiving the specific frame message and enters the sleep state through the main control circuit, shortens the wake-up time, reduces the quiescent current in the sleep state, and solves the problems of larger quiescent current and excessively high battery power consumption in the vehicle standby mode in the prior art.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a CAN wake-up circuit according to an embodiment of the present invention;
FIG. 2 is a schematic level logic diagram of a CAN message according to an embodiment of the invention;
FIG. 3 is a timing diagram of a specific frame CAN message provided by an embodiment of the invention;
FIG. 4 is a circuit diagram of a CAN transceiver circuit provided by an embodiment of the invention;
FIG. 5 is a waveform diagram of a CAN message without adding a termination resistor according to an embodiment of the invention;
FIG. 6 is a waveform diagram of a CAN message after adding a termination resistor according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a wake-up circuit according to an embodiment of the present invention;
fig. 8 is a circuit diagram of a first switch module according to an embodiment of the present invention;
fig. 9 is a circuit diagram of a connection between a second switch module and a first switch module according to an embodiment of the present invention;
fig. 10 is a circuit diagram of a master circuit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a domain controller according to an embodiment of the present invention;
fig. 12 is a schematic structural view of a vehicle according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a schematic structural diagram of a CAN wake-up circuit according to an embodiment of the present invention, and as shown in fig. 1, the CAN wake-up circuit 100 includes a CAN transceiver circuit 110, a wake-up circuit 120, and a master control circuit 130; the input end a1 of the CAN transceiver circuit 110 receives a CAN message with a specific frame, and the CAN transceiver circuit 110 is used for waking up from a dormant state according to the received CAN message with the specific frame and outputting a wake-up signal through the output end b1 according to the received CAN message with the specific frame; the input end a2 of the wake-up circuit 120 is connected with the output end b1 of the CAN transceiver circuit 110, and the wake-up circuit 120 is used for outputting a power signal to supply power according to the input wake-up signal; the input end a3 of the main control circuit 130 is connected with the output end b2 of the wake-up circuit 120, and the wake-up circuit 120 outputs a power signal to supply power to the main control circuit 130; the output terminal b3 of the master control circuit 130 is connected to the control terminal a4 of the CAN transceiver circuit 110, and the master control circuit 130 is configured to output a sleep signal to control the CAN transceiver circuit 110 to enter a sleep state. Wherein the dominant time of the CAN message of the specific frame is not less than a first time threshold, the recessive time is not less than a second time threshold, and the whole wake-up time of the specific frame is not greater than a third time threshold.
In this embodiment, the CAN wake-up circuit is a circuit for waking up a power signal according to a received CAN packet, and the CAN transceiver circuit includes a CAN transceiver for receiving the CAN packet and sending out a wake-up signal. The wake-up circuit is a circuit for executing power signal wake-up, and the main control circuit comprises a main control chip and can output a sleep signal according to the running state of the vehicle. The dominant and recessive of the CAN message are two complementary logic values specified according to the CAN2.0b specification, when the CAN message transmits the dominant state bit and the recessive state bit simultaneously, the CAN message is in the dominant state, when the CAN message transmits the dominant state bit simultaneously, the CAN message is in the dominant state, when the CAN message transmits the recessive state bit simultaneously, the CAN message is in the recessive state, for example, the dominant value is expressed as logic 0, and the recessive value is expressed as logic 1. FIG. 2 is a schematic level logic diagram of a CAN message provided by the embodiment of the invention, as shown in FIG. 2, when the CAN message is recessive (logic 1), the level of both CAN_H and CAN_L is 2.5V (the potential difference is 0V); when the CAN bus is dominant (logic 0), can_h and can_l levels are 3.5V and 1.5V, respectively (potential difference is 2.0V). The specific frame CAN message refers to a CAN message with dominant time not less than a first time threshold, recessive time not less than a second time threshold and the whole specific frame wake-up time not more than a third time threshold.
After the vehicle is powered on, when the CAN transceiver circuit 110 receives a CAN message of a specific frame, the CAN transceiver circuit 110 sends a wake-up signal, the wake-up circuit 120 receives the wake-up signal and wakes up an output power signal, the main control circuit 130 works normally according to the received power signal, and 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.
According to the technical scheme of the embodiment, the CAN wake-up circuit comprises a CAN transceiver circuit, a wake-up circuit and a main control circuit; the CAN transceiver circuit is used for receiving the CAN message of the specific frame to wake up from the dormant state and outputting a wake-up signal through the output end according to the received CAN message of the specific frame; the wake-up circuit is used for outputting a power supply signal according to the input wake-up signal so as to supply power; the input end of the main control circuit is connected with the output end of the wake-up circuit, and the wake-up circuit outputs a power supply signal to supply power for the main control circuit; the output end of the main control circuit is connected with the control end of the CAN transceiver circuit, and the main control circuit is used for outputting a sleep signal to control the CAN transceiver circuit to enter a sleep state. The CAN wake-up circuit provided by the invention wakes up by receiving the specific frame message and enters the sleep state through the main control circuit, shortens the wake-up time, reduces the quiescent current in the sleep state, and solves the problems of larger quiescent current and excessively high battery power consumption in the vehicle standby mode in the prior art.
On the basis of the above embodiment, the present embodiment defines a specific frame CAN packet, and the first time threshold is, for example, 0.75 μs, the second time threshold is 0.75 μs, and the third time threshold is 2ms. That is, the dominant time of the specific frame CAN message is not less than 0.75 mu s, the recessive time of the specific frame CAN message is not less than 0.75 mu s, and the whole specific frame wake-up time is not more than 2ms. FIG. 3 is a timing chart of a CAN message with a specific frame according to an embodiment of the invention, as shown in FIG. 3, wherein t is used for the first time threshold wake(busdom) Represented by t for the second time threshold wake(busrec) The third time threshold is denoted by t to(wake)bus And (3) representing.
Fig. 4 is a circuit diagram of a CAN transceiver circuit provided by an embodiment of the present invention, as shown in fig. 4, a 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 with one end of the first resistor module R1, the other end of the first resistor module R1 is connected with the control end a4 of the CAN transceiver circuit 110, the CAN transceiver U1 is connected with one end of the first inductor L1, the other end of the first inductor L1 is connected with the input end a1 of the CAN transceiver circuit 110, and the CAN transceiver U1 outputs a wake-up signal according to a received CAN message of a specific frame; the CAN transceiver U1 is connected with one end of the second resistor module R2, the other end of the second resistor module R2 is connected with 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 with the input end a1 of the CAN transceiver circuit 110.
In this embodiment, the CAN message communication input by the input terminal a1 of the CAN transceiver circuit 110 includes two communication modes of 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 further includes a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, the CAN transceiver U1 is connected to the first power source V1 through the fifth capacitor C5 in series, the CAN transceiver U1 is connected to the second power source V2 through the sixth capacitor C6 in series, the CAN transceiver U1 is connected to the third power source V3 through the seventh capacitor C7 in series, and the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are all 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 further includes a ninth resistance module R9, a tenth resistance module R10, and an eleventh resistance module R11.
The model of the CAN transceiver U1 is TJA1043TK, CAN be compatible with vehicles with 12V and 24V systems, is widely applied to CAN awakening of different vehicles, and CAN be applied to a voltage range V bearable by a special pin of a battery working mode of the CAN transceiver U1 BAT As shown in table 1.
TABLE 1
Figure BDA0003972744960000081
In this embodiment, the third resistor module R3 and the fourth resistor module R4 are used as terminal resistors to stabilize the CAN message signal of the specific frame received by the CAN transceiver U1. The third resistor module R3 and the fourth resistor module R4 adopt the resistor of 60.4Ω, and are suitable for long-distance transmission of CAN messages. Illustratively, when a dominant bit is sent to a network that includes at least one CAN driver in an on state, it means that there is a current through the termination resistor, and therefore, CANH and CANL have different voltage values. In the dominant state, the termination resistors stabilize and enhance the differential voltage, and when one or two termination resistors are removed, the CAN signal is unstable and the differential voltage changes. Two 60.4 ohm resistors are reserved in the circuit, which function to absorb the reflections and echoes of the signal. When CAN high-speed signal is transmitted, the signal wavelength is shorter than that of the transmission line, the signal CAN form reflected wave at the terminal of the transmission line to interfere with the original signal, so that a terminal resistor is required to be added at the terminal of the transmission line, and the signal is not reflected after reaching the terminal of the transmission line. Fig. 5 is a waveform diagram of a CAN message without a termination resistor provided by an embodiment of the present invention, and fig. 6 is a waveform diagram of a CAN message with a termination resistor provided by an embodiment of the present invention. As shown in fig. 5 and 6, after the two termination resistors R3 and R4 are added, the signal waveform of the CAN message is obviously improved, and the ringing reflection disappears.
Fig. 7 is a schematic structural diagram of a wake-up circuit according to an embodiment of the present invention, and as shown in fig. 7, the wake-up circuit 120 includes a first switch module 710 and a second switch module 720; the input end a71 of the first switch module 710 is connected to the input end a2 of the wake-up circuit 120, the output end b71 of the first switch module 710 is connected to the control end a72 of the second switch module 720, the input end a73 of the second switch module 720 is connected to the first power supply V1, and the output end b72 of the second switch module 720 is connected to the output end b2 of the wake-up circuit 120. The first switch module 710 is connected to the CAN transceiver circuit 110 and is configured to receive a wake-up signal, the first switch module 710 outputs a switch signal according to the received wake-up signal, and the second switch module 720 wakes up the first power V1 connected to the input terminal according to the received switch signal and outputs a power signal through the output terminal.
Fig. 8 is a circuit diagram of a first switch module according to an embodiment of the present invention, as shown in fig. 8, a 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 grid electrode of the first MOS tube Q1 is connected with 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 with one end of the sixth resistor module R6, the other end of the sixth resistor module R6 is connected with 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 electrode of the first MOS tube Q1 is grounded, and the drain electrode of the first MOS tube Q1 is connected with the output end b71 of the first switch module 710. The first MOS transistor Q1 includes an N-type MOS transistor, and the first diode D1 and the second diode D2 are zener diodes.
Fig. 9 is a circuit diagram of connection between a second switch module and a first switch module, that is, a circuit diagram of a wake-up circuit 120, where, as shown in fig. 9, a 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 grid electrode of the second MOS tube Q2 is connected with one end of a seventh resistor module R7, the anode of a third diode D3 and one end of an eighth resistor module R8, the other end of the seventh resistor module R7 is connected with the control end a72 of a second switch module 720, the source electrode of the second MOS tube Q2 is connected with the anode of the third diode D3 and the other end of the eighth resistor module R8 and then is connected with the input end a73 of a second switch circuit 320, the drain electrode of the second MOS tube Q2 is connected with the output end b72 of the second switch module 720, one end of a third capacitor C3 and one end of a fourth capacitor C4, and the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are grounded. The second MOS transistor Q2 includes a P-type MOS transistor, and the third diode D3 is a zener diode.
Fig. 10 is a circuit diagram of a master control circuit provided in an embodiment of the present invention, as shown in fig. 10, the master control circuit 130 includes a control unit MCU chip U2, a model number TC397XP-256f300s selected by U2, and a Y10 pin of U2 connected to an output terminal b3 of the master control circuit 130 for outputting a sleep signal to control the CAN transceiver circuit 120 to enter a sleep state.
Referring to fig. 4, 8, 9 and 10, in this embodiment, when the vehicle is powered on and started, the first power source V1 is normally powered on, the CAN transceiver U1 receives a specific frame CAN message sent from the vehicle, at this time, the 7-pin INH state of the CAN transceiver U1 changes from suspended to high level, the network sig_can0_wake connected to the 7-pin of the CAN transceiver U1 also changes from suspended to high level, and the sig_can0_wake triggers the on of the first MOS transistor 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 whole system. When the Y10 pin INH of the MCU chip U2 outputs a low level, the CAN0_AURIX_1043_STB is low level, and the CAN transceiver U1 enters a standby mode because the CAN0_AURIX_1043_STB is connected to the control end a4 of the CAN transceiver circuit, and the 7 pin INH of the CAN transceiver U1 outputs a high level at the moment; after entering the standby mode 35us, the CAN transceiver U1 enters a sleep mode, and at the moment, the 7-pin INH output of the CAN transceiver U1 is suspended; the network sig_can0_wake of the 7 pin INH connected to the CAN transceiver U1 is also suspended, the first MOS transistor Q1 is turned off, and then the second MOS transistor Q2 is also turned off, so that the second MOS transistor Q2 cannot output a power signal, and the whole system program also stops running.
Fig. 11 is a schematic structural diagram of a domain controller according to an embodiment of the present invention, where, as shown in fig. 11, the domain controller 11 includes a CAN wake-up circuit 100, and the domain controller 11 further includes an electronic control unit 111.
In this embodiment, the domain controller 11 can solve the problems of information security, increase of Electronic Control Units (ECU) and limited scattering capability, and the domain refers to a functional domain, which is divided into a power assembly, a vehicle body control, and the like, and in each domain, the domain controller is equivalent to a high-performance ECU and is responsible for processing functional control and forwarding in the domain. The CAN wake-up circuit 100 is applied to the domain controller 11, when the CAN wake-up circuit is in a wake-up state, the whole system program CAN be operated, the domain controller CAN normally operate, when the CAN wake-up circuit is in a sleep state, the whole system program also stops operating, the domain controller is in a low power consumption mode, at this time, the quiescent current of the domain controller is minimum, the use of a battery is reduced, and the service life of the battery is prolonged.
Fig. 12 is a schematic structural diagram of a vehicle according to an embodiment of the present invention, where, as shown in fig. 12, the vehicle 12 includes a domain controller 11, and the vehicle 12 further includes an on-board device 121, and the domain controller 11 controls the on-board device 121 to perform a corresponding action according to a received signal.
In this embodiment, the domain controller 11 including the CAN wake-up circuit 100 is applied to a vehicle, when the CAN wake-up circuit is in a wake-up state, the whole system program CAN be operated, the domain controller CAN work normally, the vehicle CAN work normally, when the CAN wake-up circuit is in a sleep state, the whole system program also stops operating, the domain controller is in a low power consumption mode, the vehicle is in a standby mode, at this time, the quiescent current of the vehicle is minimum, and the risk of battery power consumption being depleted due to longer time of vehicle stop is avoided. The domain controller of the vehicle wakes up the power supply by using the CAN wake-up circuit, so that the wake-up circuits among different devices are reduced, the wake-up time is shortened, and the vehicle cost is reduced.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (11)

1. A CAN wake-up circuit comprising: the CAN transceiver circuit, the wake-up circuit and the main control circuit;
the CAN transceiver circuit is used for waking up from a dormant state according to the received CAN message with the specific frame and outputting a wake-up signal through an output end according to the received CAN message with the specific frame;
the input end of the wake-up circuit is connected with the output end of the CAN transceiver circuit, and the wake-up circuit is used for outputting a power supply signal according to the input wake-up signal so as to supply power;
the input end of the main control circuit is connected with the output end of the wake-up circuit, and the wake-up circuit outputs a power supply signal to supply power for the main control circuit; the output end of the main control circuit is connected with the control end of the CAN transceiver circuit, and the main control circuit is used for outputting a sleep signal to control the CAN transceiver circuit to enter a sleep state.
Wherein the dominant time of the CAN message of the specific frame is not less than a first time threshold, the recessive time is not less than a second time threshold, and the whole wake-up time of the specific frame is not greater than a third time threshold.
2. The CAN wake-up circuit of claim 1, wherein the first time threshold is 0.75 μs, the second time threshold is 0.75 μs, and the third time threshold is 2ms.
3. The CAN wake-up circuit of claim 1 wherein the CAN transceiver circuit comprises a CAN transceiver, a first capacitor, a first resistance module, a second resistance module, a third resistance module, a fourth resistance module, and a first inductance; the CAN transceiver is connected with one end of the first resistor module, the other end of the first resistor module is connected with the control end of the CAN transceiver circuit, the CAN transceiver is connected with one end of the first inductor, the other end of the first inductor is connected with the input end of the CAN transceiver circuit, and the CAN transceiver outputs a wake-up signal according to a received CAN message of a specific frame; the CAN transceiver is connected with one end of the second resistor module, the other end of the second resistor module is connected with 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 with the input end of the CAN transceiver circuit.
4. The CAN wake-up circuit of claim 3 wherein the third and fourth resistor modules act as termination resistors for stabilizing a particular frame CAN message signal received by the CAN transceiver.
5. The CAN wake-up circuit of claim 1 wherein the wake-up circuit comprises a first switch module and a second switch module; the input end of the first switch module is connected with the input end of the wake-up circuit, the output end of the first switch module is connected with the control end of the second switch module, the input end of the second switch module is connected with a first power supply, and the output end of the second switch module is connected with the output end of the wake-up circuit.
6. The CAN wake-up circuit of claim 5, wherein the first switch module comprises a first MOS transistor, a fifth resistor module, a sixth resistor module, a first diode, a second diode, and a second capacitor; the grid of first MOS pipe is connected one end of fifth resistance module, the one end of second electric capacity, the negative pole of first diode with the negative pole of second diode, the positive pole of second diode is connected one end of sixth resistance module, the other end of sixth resistance module is connected the input of first switch module, the other end of fifth resistance module, the other end of second electric capacity and the positive pole of first diode ground connection, the source ground of first MOS pipe, the drain electrode of first MOS pipe is connected the output of first switch module.
7. The CAN wake-up circuit of claim 6, wherein the first MOS transistor comprises an N-type MOS transistor.
8. The CAN wake-up circuit of claim 6, wherein the second switch module comprises a second MOS transistor, a seventh resistor module, an eighth resistor module, a third diode, a third capacitor, and a fourth capacitor; the grid electrode of the second MOS tube is connected with one end of the seventh resistance module, the anode of the third diode and one end of the eighth resistance module, the other end of the seventh resistance module is connected with the control end of the second switch module, the source electrode of the second MOS tube is connected with the anode of the third diode and the other end of the eighth resistance module and then connected with the input end of the second switch circuit, the drain electrode of the second MOS tube is connected with 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.
9. The CAN wake-up circuit of claim 8, wherein the second MOS transistor comprises a P-type MOS transistor.
10. A domain controller comprising the CAN wake-up circuit of any one of claims 1-9.
11. A vehicle comprising the domain controller of claim 10.
CN202211525015.0A 2022-11-30 2022-11-30 CAN wake-up circuit, domain controller and vehicle Pending CN116094857A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117048371A (en) * 2023-10-13 2023-11-14 万帮数字能源股份有限公司 New energy automobile charging awakening system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117048371A (en) * 2023-10-13 2023-11-14 万帮数字能源股份有限公司 New energy automobile charging awakening system and method
CN117048371B (en) * 2023-10-13 2023-12-15 万帮数字能源股份有限公司 New energy automobile charging awakening system and method

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