A vehicle power supply hibernation wake-up system and vehicle

Abstract

The application relates to the technical field of vehicle control, and discloses a vehicle power supply hibernation wake-up system and a vehicle. The application adds a CAN hibernation power supply circuit for continuously supplying power to a CAN transceiver in a vehicle power supply hibernation wake-up system, such as a 48V system, to continuously supply power to the CAN transceiver through the circuit, so that a CAN wake-up scheme in the system is realized. In this way, the system can not only support a KL15 wake-up scheme, but also support a CAN wake-up scheme, and the robustness of system hibernation wake-up is improved. Moreover, even if a KL15 hard line does not exist or the KL15 hard line is faulty, the system can perform system hibernation wake-up through the CAN wake-up scheme, and the accuracy and flexibility of system hibernation wake-up are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a vehicle power supply sleep-wake system and a vehicle. Background Technology

[0002] The 48V system in a vehicle is an economical and efficient mild hybrid solution. Currently, 48V systems typically only support the ignition signal (KL15) wake-up scheme. This KL15 wake-up scheme is the core power management mechanism in the vehicle's electronic control system. By igniting KL15, the Electronic Control Unit (ECU) is triggered to switch from sleep mode to operating mode, allowing these ECUs to receive constant power through the constant power line (KL30).

[0003] However, the KL15 wake-up solution relies on KL15 hardwired wiring, which has a high hardware cost and may easily lead to situations where sleep and wake-up are not possible due to KL15 malfunctions. Utility Model Content

[0004] This application provides a vehicle power supply sleep wake-up system and vehicle, which can improve the accuracy and flexibility of vehicle sleep wake-up.

[0005] In a first aspect, embodiments of this application provide a vehicle power supply sleep / wake-up system, comprising: a buck converter circuit, a power management circuit, a CAN sleep power supply circuit, and a CAN transceiver; the CAN sleep power supply circuit is connected to the CAN transceiver, used to input a power supply voltage, convert the power supply voltage into a first output voltage, and continuously output the first output voltage to the CAN transceiver; the CAN transceiver is connected to the buck converter circuit, used to input a CAN wake-up signal, and when the CAN transceiver is in a sleep state, wakes up the CAN transceiver based on the CAN wake-up signal, and outputs a sleep / wake-up signal to the buck converter circuit; the buck converter circuit is also connected to the power management circuit, used to input a power supply voltage, and when the buck converter circuit is in a sleep state, wakes up the buck converter circuit based on the sleep / wake-up signal, converts the power supply voltage into a second output voltage, and uses the second output voltage to supply power to the power management circuit and the CAN transceiver.

[0006] Therefore, this application incorporates a CAN sleep power supply circuit in the vehicle power supply sleep / wake-up system to continuously power the CAN transceiver. This circuit continuously supplies power to the CAN transceiver, enabling a CAN wake-up scheme similar to that in a 48V system. This reduces the flexibility of sleep / wake-up and lowers wake-up power consumption. Furthermore, even if the KL15 hardwire is removed from the vehicle, the CAN sleep / wake-up scheme can still be implemented, thereby reducing the overall vehicle wiring harness cost.

[0007] In one possible implementation of the first aspect described above, the first output voltage is less than the second output voltage, and the first output voltage is greater than the set power supply voltage of the CAN transceiver, such as 4.5V.

[0008] In one possible implementation of the first aspect described above, the CAN sleep power supply circuit is a low-dropout linear regulator (LDO) circuit. Thus, the LDO circuit can provide a stable power supply voltage to the CAN transceiver.

[0009] In one possible implementation of the first aspect above, the CAN sleep power supply circuit includes: a resistor, a transistor circuit, a Zener diode, a capacitor, and a second capacitor. The first end of the resistor is connected to the constantly active wire KL30 and the collector of the transistor circuit. The second end of the resistor is connected to the negative terminal of the Zener diode and the first end of the first capacitor. The base of the transistor circuit is connected to the first end of the capacitor. The emitter of the transistor circuit is connected to the first end of the second capacitor and the CAN transceiver. The second ends of the first capacitor and the second ends of the second capacitor are both grounded.

[0010] In one possible implementation of the first aspect described above, the Zener diode is a Zener diode with a voltage rating of less than 24V.

[0011] In one possible implementation of the first aspect above, a first switching diode is provided between the CAN sleep power supply circuit and the CAN transceiver. The positive terminal of the first switching diode is connected to the CAN sleep power supply circuit, the negative terminal of the first switching diode is connected to the CAN transceiver, and a third output voltage after the first output voltage is adjusted is applied to the CAN transceiver through the first switching diode.

[0012] In one possible implementation of the first aspect described above, the first switching diode is a switching diode with a withstand voltage greater than 16V.

[0013] In one possible implementation of the first aspect above, a second switching diode and a third capacitor are provided between the constantly powered line and the CAN sleep power supply circuit. The positive terminal of the second switching diode is connected to the constantly powered line and the first terminal of the third capacitor, and the second terminal of the third capacitor is connected to the positive terminal of the Zener diode.

[0014] In one possible implementation of the first aspect described above, the second switching diode is a switching diode with a withstand voltage greater than 60V.

[0015] In one possible implementation of the first aspect above, a third switching diode is provided between the buck converter circuit and the CAN transceiver. The positive terminal of the third switching diode is connected to the buck converter circuit, and the negative terminal of the third switching diode is connected to the CAN transceiver. The fourth output voltage, after adjustment of the second output voltage, is applied to the CAN transceiver through the third switching diode.

[0016] In one possible implementation of the first aspect above, a fourth switching diode is provided between the buck converter circuit and the CAN transceiver. The positive terminal of the fourth switching diode is connected to the suppression pin of the CAN transceiver, and the negative terminal of the fourth switching diode is connected to the buck converter circuit. The sleep / wake-up signal is transmitted to the buck converter circuit through the fourth switching diode.

[0017] In one possible implementation of the first aspect above, the system includes a CAN sleep power supply circuit and a plurality of CAN transceivers, wherein the CAN transceiver is one of the plurality of CAN transceivers, and each CAN transceiver is connected to the CAN sleep power supply circuit.

[0018] In one possible implementation of the first aspect above, the system includes multiple CAN sleep power supply circuits and multiple CAN transceivers. The CAN sleep power supply circuit is one of the multiple CAN sleep power supply circuits, and the CAN transceiver is one of the multiple CAN transceivers. Each CAN transceiver is connected to one CAN sleep power supply circuit. Each CAN sleep power supply circuit is connected to a live wire, and each CAN transceiver is connected to the buck converter circuit.

[0019] In one possible implementation of the first aspect above, the CAN transceiver is used to connect to the electronic control unit (ECU) and / or the on-board terminal device (T-BOX) in the vehicle via a CAN bus.

[0020] In one possible implementation of the first aspect above, the CAN sleep power supply circuit is further used to connect to a 48V power supply, the power supply voltage being the output voltage of the 48V power supply, the step-down converter circuit being a step-down circuit for converting 48V to 12V, and the second output voltage being the output voltage of the step-down circuit.

[0021] Secondly, embodiments of this application provide a vehicle including a vehicle power supply sleep-wake system as described in the first aspect above and any possible implementation thereof. Attached Figure Description

[0022] Figure 1A According to some embodiments of this application, a structural schematic diagram of a vehicle 12V system 01A is shown;

[0023] Figure 1B According to some embodiments of this application, a structural schematic diagram of a vehicle 48V system 01B is shown;

[0024] Figure 2 According to some embodiments of this application, a schematic diagram of the structure of a vehicle power supply sleep-wake system 10 is shown;

[0025] Figure 3 According to some embodiments of this application, a schematic diagram of the structure of a vehicle power supply sleep-wake system 10 is shown;

[0026] Figure 4 According to some embodiments of this application, a schematic diagram of a sleep power supply circuit 13 is shown;

[0027] Figure 5 According to some embodiments of this application, a structural schematic diagram of a vehicle is shown. Detailed Implementation

[0028] The illustrative embodiments of this application include, but are not limited to, a vehicle-powered sleep / wake-up system and a vehicle.

[0029] Reference Figure 1A This is a schematic diagram of a vehicle 12V system. The 12V system 01A typically includes a 12-volt (V) battery. System 01A includes a System Basis Chip (SBC) / Power Management IC (PMIC) and a CAN transceiver.

[0030] Specifically, the 12V system 01A supports two sleep wake-up schemes: KL15 wake-up and CAN wake-up. For example... Figure 1AAs shown, in the KL15 wake-up scheme, a change in the KL15 level can wake up the SBC / PMIC, thereby powering up all ECUs. In this case, these ECUs are powered by a constant voltage (e.g., 12V) supplied by the constant power line (KL30). Furthermore, in the CAN wake-up scheme, a change in the KL15 level wakes up the CAN transceiver, causing the CAN transceiver to output a signal through its suppressor pin (INH) to wake up the SBC / PMIC, thus enabling the SBC / PMIC to control the power-up of all ECUs. Alternatively, in the CAN wake-up scheme, a CAN message can wake up the CAN transceiver, causing the CAN transceiver to output a signal through its INH pin to wake up the SBC / PMIC, thereby powering up all ECUs.

[0031] Reference Figure 1B This is a schematic diagram of a 48V system for a vehicle, which typically includes a 48V power source, such as a 48V battery. Figure 1B As shown, system 01B includes a buck converter (BUCK) 011, a system base chip (SBC) / power management IC (PMIC) 012, and a CAN transceiver 013.

[0032] like Figure 1B As shown, in the KL15 wake-up scheme, the BUCK circuit can be triggered by the KL15 level change to wake up the SBC / PMIC, so that the SBC / PMIC controls all ECUs to be powered on, thereby enabling these ECUs to be powered by the constant power such as 48V provided by the constant power line (KL30).

[0033] It's understandable that conventional technologies only support CAN wake-up schemes in 12V systems, while 48V systems only support KL15 wake-up and not CAN wake-up. Therefore, existing sleep-wake-up schemes in 48V systems lack robustness, increasing hardware costs without providing an additional wake-up channel, making the system more prone to malfunctions and inability to wake up from sleep.

[0034] To improve the accuracy and flexibility of sleep / wake-up in 48V systems, this application adds a CAN wake-up scheme to the 48V system. This allows the improved 48V system to support not only the KL15 wake-up scheme but also the CAN wake-up scheme, enhancing the robustness of system sleep / wake-up. Furthermore, even if the system lacks a KL15 hardwire or experiences a fault in the KL15 hardwire, the system can still wake up from sleep using the CAN wake-up scheme, further improving the accuracy and flexibility of system sleep / wake-up.

[0035] Specifically, this application implements a CAN wake-up scheme in a 48V system by adding a circuit for continuously powering the CAN transceiver through the circuit. In the following embodiments, this power supply circuit is referred to as the CAN sleep power supply circuit.

[0036] Reference Figure 2 As shown, this application provides a vehicle power supply sleep / wake-up system, which is a 48V system. Specifically, the vehicle power supply sleep / wake-up system 10 includes: a buck converter (BUCK) circuit 11, a power management circuit 12, a CAN sleep power supply circuit 13, and a CAN transceiver 14.

[0037] The CAN sleep power supply circuit 13 is connected to the CAN transceiver 14. It is used to input the power supply voltage, convert the power supply voltage into the first input voltage, and continuously output the first output voltage to the CAN transceiver 14.

[0038] In some embodiments, the CAN sleep power supply circuit 13 can be a voltage regulator circuit. The input terminal c1 of the CAN sleep power supply circuit 13 is connected to the constant power line (KL30), and the output terminal c2 is connected to the first input terminal d1 (such as the power supply input terminal) of the CAN transceiver 14.

[0039] In some embodiments, the CAN sleep power supply circuit 13 can be connected to a 48V power supply, such as by connecting to a 48V power supply via a constant power line. This 48V power supply is used to output the power supply voltage, which can be 48V.

[0040] It's understandable that KL30 is the positive terminal of the vehicle battery, typically connected to the positive terminal to provide power to the vehicle's main systems, and is unaffected by the ignition switch. In the BUCK circuit, KL30 serves as the input power source, providing a stable voltage input to the BUCK circuit. At this time, a 48V power supply can power the vehicle battery.

[0041] The CAN transceiver 14 is connected to the BUCK circuit 11 and is used to input a CAN wake-up signal. When the CAN transceiver 14 is in a sleep state, the CAN wake-up signal is used to wake up the CAN transceiver 14, that is, the CAN transceiver 14 switches from the sleep state to the working state and outputs the sleep wake-up signal to the buck converter circuit 11.

[0042] It is understandable that a CAN transceiver can be in either an active (or normal) or sleep state. Sleep state is a low-power mode designed to reduce system energy consumption while maintaining a fast response to CAN bus activity. In sleep state, the CAN transceiver shuts down some circuit modules (such as drivers and receivers), retaining only essential monitoring functions (such as wake-up detection), thereby significantly reducing static power consumption.

[0043] In some embodiments, the CAN wake-up signal corresponds to an ECU in the vehicle that needs to be woken up from hibernation. Therefore, in the CAN wake-up scheme for a 48V system provided in this application embodiment, receiving the CAN wake-up signal through the CAN transceiver 14 enables the CAN transceiver 14 to be operational, and the CAN transceiver 14 can supply power to the ECU corresponding to the CAN wake-up signal to wake up these ECUs.

[0044] As an example, CAN transceiver 14 can be a CAN chip.

[0045] As an example, the first input terminal d1 of the CAN transceiver 14 can be the ACC pin, meaning that the CAN sleep power supply circuit 13 can power the CAN transceiver 14 through this ACC pin. The output terminal d3 of the CAN transceiver 14 can be connected to the second input terminal a3 of the BUCK circuit 11, and the output terminal d3 of the CAN transceiver 14 can be the suppressor pin (INH).

[0046] In some embodiments, the second input terminal d2 of the CAN transceiver 14 is connected to the CAN bus and can detect signals on the CAN bus (such as a CAN wake-up signal). For example, the second input terminal d2 may include the CAN_H pin and the CAN_L pin of the CAN transceiver 14. The CAN_H pin of the CAN transceiver 14 is a high-level bus and can be connected to the CAN_H line of the CAN bus. The CAN_L pin of the CAN transceiver 14 is a low-level bus and is connected to the CAN_L line of the CAN bus. Furthermore, the CAN transceiver lines and the CAN transceiver 14 need to share a common ground to ensure consistent level references.

[0047] As an example, the CAN wake-up signal mentioned above can be a specific wake-up frame that appears on the CAN bus (such as a dominant-recessive-dominant mode conforming to the ISO11898-2 standard). In this case, the CAN transceiver 14 can trigger the wake-up mechanism when it detects the wake-up frame.

[0048] In some embodiments, the CAN transceiver 14 enters a dormant state after the vehicle's electronic systems (such as the ECU and BCM) are turned off to extend battery life. The BCM (Body Control Module) primarily controls the vehicle's electrical systems, such as lights, wipers, washer fluid, door locks, power windows, sunroof, power mirrors, and remote control. The ECU (Electronic Control Unit) manages and controls various electronic features and functions. The ECU receives sensor input, processes data, and sends commands to different vehicle components to ensure optimal performance; for example, the ECU is used for engine control, transmission control, brake (ABS) control, airbag control, infotainment control, and advanced driver assistance systems (ADAS) control.

[0049] The BUCK circuit 11 is also connected to the power management circuit 12 for inputting power supply voltage. When the BUCK circuit 11 is in a sleep state, it is woken up by a sleep wake-up signal and the power supply voltage is converted into a second output voltage to supply power to the power management circuit 11 and the CAN transceiver 14.

[0050] In some embodiments, the first input terminal a1 of the buck converter circuit 11 is connected to KL30 (i.e., the constantly powered line) to receive a power supply voltage, such as the battery voltage, through KL30. The output terminal c2 of the buck converter circuit 11 is connected to the first input terminal d1 of the CAN transceiver 14 (such as the ACC pin in the CAN transceiver 14).

[0051] It is understandable that in a 48V system, the power supply voltage is 48V, and the second output voltage of the BUCK circuit 11 can be 12V.

[0052] As an example, BUCK circuit 11 can be a step-down circuit, such as a step-down circuit used to convert 48V to 12V. In this case, the second output voltage is the output voltage of the step-down circuit, such as 12V.

[0053] As an example, the power management circuit 12 can be an SBC / PMIC, but is not limited to this. Specifically, the input terminal b1 of the power management circuit 12 is connected to the output terminal a2 of the BUCK circuit 11, and the output terminal ( Figure 2 (Not shown) Connect to the corresponding ECU, such as all ECUs of the vehicle or ECUs related to engine control, and supply power to these ECUs.

[0054] In some embodiments, the first output voltage is less than the second output voltage, and the first output voltage is greater than the set power supply voltage of the CAN transceiver 14.

[0055] As an example, the second output voltage of the BUCK circuit 11 is 12V, and the first output voltage of the CAN sleep power supply circuit 13 only needs to be less than 12V and greater than the power supply voltage of the CAN transceiver. For example, the CAN transceiver 14 is model TJA1043 BAT, which can operate with a power supply voltage higher than 4.5V, i.e., the set power supply voltage is 4.5V. In this case, the first output voltage of the CAN sleep power supply circuit 13 can be 6V. Furthermore, testing shows that when the CAN transceiver 14 is supplied with a 6V power supply voltage, the sleep current is about 100uA, reaching the static current level of a 12V system.

[0056] In some embodiments, based on Figure 2 The circuit shown in this application, in a 48V system, includes the following specific steps for the CAN wake-up scheme: When the CAN transceiver 14 is in sleep mode, a CAN wake-up signal is input from the corresponding CAN bus. At this time, since the CAN sleep power supply circuit 13 continuously supplies power to the CAN transceiver 14, the CAN transceiver 14 can be woken up based on this CAN wake-up signal, and output a sleep wake-up signal to the BUCK circuit 11 through its INH pin, thereby triggering the BUCK circuit 11 to wake up the corresponding ECU or controller.

[0057] In addition, such as Figure 2 As shown, the vehicle power supply sleep-wake system 10 may or may not include the KL15 hard wire, and this application embodiment does not specifically limit this.

[0058] As an example, when the vehicle power supply sleep-wake system 10 includes a KL15 hardwire, in the KL15 wake-up scheme, a high-level signal on KL15 can control all ECUs in the vehicle to receive power, thereby waking them up. It can be understood that the KL15 wake-up scheme typically wakes up all ECUs in the vehicle, while the CAN wake-up scheme can wake up not only all ECUs but also some ECUs, making the sleep-wake method more flexible.

[0059] KL15 is the engine ignition signal (corresponding to the start state of the vehicle key), and also the signal for turning the key to start the car. KL15 is controlled by the key ignition switch, and its power comes from the power supply of KL30. The two are directly connected together through the key ignition switch. When the key is turned on, KL30 and KL15 are connected.

[0060] It is understandable that the KL30 provides low-voltage power to the various ECUs (electronic control units) in the vehicle, typically between 11V and 15V, to maintain ECU memory, clock, and other functions, ensuring the normal operation of the electronic control units. For example, some ECUs connected to the positive terminal of the battery and powered by the KL30 can enter sleep mode through CAN network management, such as keyless entry controllers.

[0061] Furthermore, when the key is turned to the ignition position, the KL15 circuit provides power to various vehicle devices to control the electrical components related to engine ignition and vehicle starting, such as the chassis system's ECU, ABS, and ESP, ensuring the engine starts and runs smoothly upon ignition. Upon receiving the KL15 signal, the chassis system's ECU begins to precisely adjust the vehicle's suspension, steering, and other components to ensure vehicle stability and handling. Triggered by the KL15 signal, the ABS system is ready to function during emergency braking to prevent wheel lock-up and ensure driving safety. The ESP electronic stability program also relies on the KL15 signal for activation, intervening promptly to adjust the vehicle's trajectory when instability occurs, ensuring it maintains the correct driving path.

[0062] Thus, this application adds a CAN sleep power supply circuit to the 48V system, ensuring the CAN transceiver has a low-voltage input even when the BUCK circuit is not working, thereby guaranteeing the CAN wake-up function. Furthermore, even if the KL15 hardwire is removed from the vehicle, the CAN sleep-wake-up solution can still be implemented, thereby reducing the overall vehicle wiring harness cost.

[0063] Furthermore, in some embodiments, the CAN sleep power supply circuit 13 provided in this application can be a low dropout regulator (LDO) circuit to provide a stable DC voltage power supply. The LDO circuit can provide a stable power supply voltage to the CAN transceiver.

[0064] Reference Figure 3 The diagram shown is a detailed structural schematic of the vehicle power supply sleep / wake-up system provided in an embodiment of this application. Specifically, regarding... Figure 3 The system shown is Figure 2 The similarities between the systems shown will not be elaborated upon; the only difference lies in... Figure 3 The specific structure of the CAN sleep power supply circuit 13 is shown. In this case, the CAN sleep power supply circuit 13 is an LDO circuit, for example, an LDO chip. Furthermore, Figure 3 The diagram also shows a power supply 20 (e.g., a 48V power supply) connected to KL30, a startup circuit 30 connected to KL15, and a signal detection circuit 40 connected to the CAN bus.

[0065] like Figure 3As shown, the CAN sleep power supply circuit 13 includes: resistor R1, transistor circuit Q1, Zener diode D1, capacitor C1, and second capacitor C2.

[0066] Specifically, the first end of resistor R1 is connected to KL30 and the collector (C) of transistor Q1, and the second end of resistor R1 is connected to the cathode of Zener diode D1 and the first end of capacitor C1. In this way, the first end of resistor R1 is connected to a power supply 20, such as a battery, through KL30, so that a power supply voltage is input into resistor R1.

[0067] The base (B) of transistor circuit Q1 is connected to the first terminal of the first capacitor C1, and the emitter (E) of transistor circuit Q1 is connected to the first terminal of the second capacitor C2 and the CAN transceiver 14.

[0068] In addition, the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are both grounded.

[0069] As an example, the Zener diode D1 mentioned above can be a Zener diode with a voltage rating of less than 24V. For example, the Zener diode D1 is model BZX384-B7V5, with a nominal Zener voltage of 7.5V and an accuracy of ±2%, making it suitable for circuits requiring high-precision voltage regulation.

[0070] As an example, the transistor circuit Q1 described above can be an NPN type transistor. For instance, the transistor circuit Q1 can be a PBHV8115T transistor with a collector current of 1A and a collector-emitter breakdown voltage of 150V.

[0071] As an example, the resistance of resistor R1 can be 1 megohm (MΩ), the first capacitor C1 is a 100 nanofarad (nF) capacitor, and the capacitor C2 is a 1 microfarad (μF) capacitor.

[0072] As an example, Figure 3 The start circuit 30 shown can be a vehicle key start circuit for connection to KL15 hardwire.

[0073] It is understood that, in the embodiments of this application, Figure 3 The signal detection circuit 40 shown can be used to transmit a CAN wake-up signal when the vehicle is in a sleep state, such as when the CAN transceiver 14 in the vehicle is in a sleep state.

[0074] As an example, the signal detection circuit 40 described above can be one of the following units:

[0075] 1. In-vehicle terminal equipment (Telematics Box, T-BOX). In this case, the output of the signal detection circuit 40 is connected to the input d1 of the CAN transceiver 14 via the CAN bus. The CAN wake-up signal can be a remote wake-up signal. For example, when a user remotely turns on functions such as air conditioning or seat heating via an application on a mobile phone or other electronic device, the T-BOX in the vehicle is first woken up, and then sends a CAN wake-up signal via the CAN bus to wake up other related controllers (i.e., ECUs), such as the high-voltage controller and the air conditioning controller.

[0076] 2. On-Board Charger (OBC): When the vehicle is plugged into a slow charger, the OBC will be woken up first, recognize the plugging behavior and the connection status of the slow charger, and then send a CAN wake-up signal through the CAN bus to wake up the battery management system (BMS) and other related controllers to start charging.

[0077] 3. Active wake-up node controller: In the vehicle sleep wake-up scenario, some controllers act as active wake-up nodes, such as the integrated electronic braking system (IEB) in the chassis domain control. It will send a specific CAN wake-up signal through the CAN bus according to the wake-up requirements to wake up the related controllers such as the electric power steering system (EPS), electronic parking brake system (EPB), and vehicle control unit (VCU).

[0078] 4. Other Electronic Control Units (ECUs). In the vehicle network, the various ECUs communicate with each other via the CAN bus. When an ECU needs to wake up other ECUs, it sends a CAN wake-up signal via the CAN bus. For example, when the vehicle has a communication requirement, the ECU will wake up from sleep mode and send an NM (Network Management) message via the CAN bus to notify other nodes to enter normal operating mode.

[0079] It is understood that the specific implementation of the signal detection circuit 40 provided in this application embodiment is not limited to the above examples, and may also be other circuits, which are not specifically limited in this application embodiment. Correspondingly, the controller (or ECU) that initiates the CAN wake-up signal in this application implementation is not limited to the above examples, and is not specifically limited in this application embodiment.

[0080] Thus, this application can realize the CAN sleep power supply circuit 13 by building with discrete components, so that the CAN transceiver can be continuously powered by the CAN sleep power supply circuit to support the CAN wake-up function of the 48V system.

[0081] Furthermore, in Figure 3 Based on the circuit shown, refer to Figure 4The circuit diagram of the sleep power supply circuit 13 shown illustrates the specific connection relationship between the CAN sleep power supply circuit 13, KL30, and CAN transceiver 14.

[0082] like Figure 4 As shown, a first switching diode D2 is disposed between the CAN sleep power supply circuit 13 and the CAN transceiver 14. The positive terminal of the first switching diode D2 is connected to the CAN sleep power supply circuit 13, and the negative terminal of the first switching diode D2 is connected to the CAN transceiver 14. The third output voltage, after adjustment of the first output voltage, is applied to the CAN transceiver 14 through the first switching diode D2. For example, the third output voltage is 4.5-6V.

[0083] As an example, the first switching diode D2 can be a switching diode with a withstand voltage greater than 16V. For instance, the first switching diode D2 can be a BAS316 switching diode with a maximum forward current of 250mA, a maximum reverse voltage of 75V to 100V, and a forward voltage drop of approximately 1.25V (@150mA).

[0084] In some embodiments, such as Figure 4 As shown, a second switching diode D5 and a third capacitor C2 are provided between the constant power supply line KL30 and the CAN sleep power supply circuit 13. The positive terminal of the second switching diode D5 is connected to the first terminal of the constant power supply line KL30 and the third capacitor C3, and the second terminal of the third capacitor C3 is connected to the positive terminal of the Zener diode D1.

[0085] As an example, the second switching diode D5 can be a switching diode with a withstand voltage greater than 60V. For instance, the second switching diode D5 can be a BAS316 switching diode.

[0086] As an example, the third capacitor C3 mentioned above can be a 10μF capacitor.

[0087] In some embodiments, the above description continues. Figure 3 In the circuit shown, a third switching diode D3 is provided between the BUCK circuit 11 and the CAN transceiver 14. The positive terminal of the third switching diode D3 is connected to the BUCK circuit 11, and the negative terminal of the third switching diode D3 is connected to the CAN transceiver 14. The fourth output voltage after the second output voltage is adjusted is applied to the CAN transceiver 14 through the third switching diode D3.

[0088] Specifically, the positive terminal of the third switching diode D3 is connected to the output terminal a2 of the BUCK circuit 11, and the negative terminal of the third switching diode D3 is connected to the input terminal d1 of the CAN transceiver 14.

[0089] As an example, the BUCK circuit 11 can adjust the second input voltage to the fourth input voltage using components such as voltage divider resistors, for example, adjusting 12V to 4.5V.

[0090] As an example, the third output voltage mentioned above is typically lower than the fourth output voltage mentioned above. For example, the fourth output voltage is 6-8V.

[0091] In some embodiments, the above description continues. Figure 3 In the circuit shown, a fourth switching diode D4 is provided between the BUCK circuit 11 and the CAN transceiver 14. The positive terminal of the fourth switching diode D4 is connected to the suppression pin (INH) of the CAN transceiver 14, and the negative terminal of the fourth switching diode D4 is connected to the BUCK circuit 11. The sleep / wake-up signal is transmitted to the BUCK circuit 11 through the third switching diode D3.

[0092] Specifically, the positive terminal of the fourth switching diode D4 is connected to the suppression pin (INH) of the CAN transceiver 14, i.e., the output terminal d3, and the negative terminal of the fourth switching diode D4 is connected to the input terminal a3 of the BUCK circuit 11.

[0093] It is understandable that in normal mode, the INH pin of CAN transceiver 14 remains high; in sleep mode, the INH pin is pulled low. CAN transceiver 14 can switch its operating mode by controlling the STB and EN pins, thereby controlling the state of the INH pin.

[0094] As an example, the fourth switching diode D4 can be a switching diode of type BAS316.

[0095] As an example, the aforementioned sleep / wake-up signal can be a high-level signal on the INH pin. The high-level signal on the INH pin can be used to notify other modules (such as BUCK circuit 11 and the MCU) to wake up from low-power mode.

[0096] It is understood that the specific structure of the CAN sleep power supply circuit 13 provided in this application embodiment is not limited to the above example, and may also be other forms of LDO circuit, which is not specifically limited in this application embodiment.

[0097] Furthermore, in some embodiments, the vehicle power supply sleep-wake system 10 includes a CAN sleep power supply circuit (i.e., the CAN sleep power supply circuit 13) and multiple CAN transceivers, wherein the CAN transceiver 14 is one of the multiple CAN transceivers, and each CAN transceiver is connected to the CAN sleep power supply circuit 13.

[0098] Specifically, the input terminal (e.g., input terminal d1) of each CAN transceiver is connected to the output terminal c2 of the CAN sleep power supply circuit 13, so that these CAN transceivers are powered by the CAN sleep power supply circuit 13. Correspondingly, each CAN transceiver can be connected to the corresponding CAN bus, such as the input terminal d2 of each CAN transceiver being connected to the corresponding CAN bus.

[0099] In some embodiments, the vehicle power supply sleep / wake-up system 10 provided in this application may include multiple CAN sleep power supply circuits and multiple CAN transceivers. Figure 2 The CAN sleep power supply circuit 13 shown is one of multiple CAN sleep power supply circuits. Figure 2 The CAN transceiver 14 shown is one of a plurality of CAN transceivers. Each CAN transceiver is connected to a CAN sleep power supply circuit, each CAN sleep power supply circuit is connected to the constant power line KL30, and each CAN transceiver is connected to a buck converter circuit.

[0100] Specifically, the input terminal (e.g., input terminal d1) of each CAN transceiver is connected to the output terminal (e.g., output terminal c2) of the corresponding CAN sleep power supply circuit, so that the CAN transceiver is powered by the CAN sleep power supply circuit. Accordingly, each CAN transceiver can be connected to the corresponding CAN bus, for example, the input terminal d2 of each CAN transceiver can be connected to the corresponding CAN bus.

[0101] In some embodiments, different CAN buses can connect to different ECUs in the vehicle, for example, one or more ECUs can be mounted on a single CAN bus.

[0102] As an example, when multiple ECUs are connected on a CAN bus, a CAN wake-up signal sent by one of the ECUs to the CAN bus is usually used to wake up all the ECUs in the multiple ECUs.

[0103] As an example, when a T-BOX is connected to a CAN bus, the CAN wake-up signal sent by the T-BOX to the CAN bus is typically used to wake up one or more ECUs in the vehicle, such as the ECU related to the air conditioning.

[0104] As an example, in a vehicle, the ECU corresponding to the chassis, the ECU corresponding to the steering system, and the ECU corresponding to the autonomous driving system can be mounted on the same CAN bus (denoted as bus A1), which is connected to a CAN transceiver (denoted as CAN transceiver 14a). In this case, after the CAN transceiver 14a receives a CAN wake-up signal from the corresponding CAN bus, it can be woken up from its sleep state based on this CAN wake-up signal. This wake-up signal then outputs a sleep wake-up signal to the BUCK circuit 11 via the INH pin, waking the BUCK circuit 11 to power on all ECUs corresponding to bus A1 through the power management circuit 12.

[0105] As another example, in a vehicle, the ECU corresponding to brake control, the ECU corresponding to the pedal, and the ECU corresponding to the door can be mounted on the same CAN bus (denoted as bus B1), which is connected to a CAN transceiver (denoted as CAN transceiver 14b). In this case, after the CAN transceiver 14b receives a CAN wake-up signal from the corresponding CAN bus B1, it can be woken up from its sleep state based on the CAN wake-up signal. Then, it outputs a sleep wake-up signal to the BUCK circuit 11 through the INH pin, so that the BUCK circuit 11 can power on all the ECUs corresponding to bus B1 through the power management circuit 12.

[0106] In some embodiments, the CAN wake-up signal in this application corresponds to all ECUs in the vehicle. In this case, in the CAN wake-up scheme under the 48V system provided in this application, the CAN wake-up signal received by the CAN transceiver 14 can power all ECUs in the vehicle to trigger a global power-on of the vehicle.

[0107] As an example, when the above-mentioned vehicle power supply sleep wake-up system 10 includes multiple CAN transceivers, each CAN transceiver can input a CAN wake-up signal on the corresponding CAN bus. Thus, the CAN wake-up signal triggers the power management circuit 12 to power and wake up the corresponding ECU through the BUCK circuit 11, thereby enabling all ECUs in the vehicle to be powered and woken up.

[0108] In some embodiments, the CAN wake-up signal in this application corresponds to a portion of the ECUs in the vehicle. In this case, in the CAN wake-up scheme under the 48V system provided in this application, the CAN wake-up signal received by the CAN transceiver 14 can supply power to that portion of the ECUs in the vehicle to trigger partial power-on of the vehicle. For example, it can trigger partial power-on of the vehicle's air conditioning system or chassis system.

[0109] As an example, when the above-mentioned vehicle power supply sleep wake-up system 10 includes multiple CAN transceivers, each CAN transceiver can input a CAN wake-up signal on the corresponding CAN bus. Thus, the CAN wake-up signal triggers the power management circuit 12 to power and wake up the corresponding ECU through the BUCK circuit 11, thereby enabling all ECUs in the vehicle to be powered and woken up.

[0110] Thus, in this embodiment of the application, by adding a CAN wake-up scheme to the 48V system, the ECU in the vehicle can be woken up remotely or locally via CAN wake-up, eliminating the need for a KL15 hardwire, thereby reducing hardware costs and wake-up power consumption. Furthermore, the CAN wake-up method in this application can wake up some ECUs in the vehicle, further reducing wake-up power consumption and improving wake-up flexibility.

[0111] In some embodiments, this application may also provide a vehicle that includes the vehicle power supply sleep-wake system 10 shown in the various embodiments above.

[0112] In some embodiments, the vehicles applicable to this application may be cars, trucks, motorcycles, buses, boats, airplanes, helicopters, lawnmowers, recreational vehicles, amusement park vehicles, construction equipment, trams, golf carts, trains, and handcarts, etc., and this application does not impose any particular limitation.

[0113] In some embodiments, the present application can be applied to vehicle remote wake-up scenarios (such as remotely waking up the vehicle's air conditioning system) and vehicle local wake-up scenarios (such as waking up the vehicle's chassis system by pressing a vehicle pedal). Furthermore, in these wake-up scenarios, the vehicle, based on the vehicle power supply sleep wake-up system 10 of the present application, can use the CAN wake-up method to wake up all or some of the ECUs in the vehicle.

[0114] Next, combine Figure 5 The structure of the vehicle will be described. Figure 5 A schematic diagram of a vehicle structure provided in an embodiment of this application is shown.

[0115] Figure 5 This is a schematic diagram illustrating a possible functional framework of a vehicle provided in an embodiment of this application. For example... Figure 5 As shown, the functional framework of vehicle 100 may include various subsystems, such as the sensor system 110, control system 120, one or more peripheral devices 130 (one is shown as an example), power supply 140, and computer system 150. Optionally, vehicle 100 may also include other functional systems, such as an engine system that provides power to vehicle 1, etc., which are not limited herein.

[0116] The sensor system 110 may include several detection devices that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to a certain rule. As shown in the figure, these detection devices may include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a door sensor, a pedal sensor, etc., and this application is not limited thereto.

[0117] The control system 120 may include a steering unit 21, a braking unit 22, etc.

[0118] Steering unit 21 can represent a system for adjusting the direction of travel of vehicle 1, and may include, but is not limited to, a steering wheel or other structural device for adjusting or controlling the direction of travel of vehicle 1. Braking unit 22 can represent a system for slowing down the speed of vehicle 1, and may also be referred to as the vehicle 1 braking system. It may include, but is not limited to, a brake controller, a reducer, or other structural device for slowing down vehicle 1. In practical applications, braking unit 22 can use friction to slow down the tires of vehicle 1, thereby slowing down the speed of vehicle 1.

[0119] Peripheral device 130 may include several components, such as the communication system 31, touch screen 32, user interface 33, etc., as shown in the figure. The communication system 31 is used to enable network communication between vehicle 1 and other devices besides vehicle 100, such as electronic device 2. In practical applications, the communication system 31 can employ wireless communication technology or wired communication technology to achieve network communication between vehicle 100 and other devices. This wired communication technology can refer to communication between vehicle 100 and other devices such as mobile phones via network cable or fiber optic cable. For example, the communication system 31 may include a T-BOX circuit.

[0120] The touchscreen 32 can be used to detect operation commands on the touchscreen 32. The user interface 33 can specifically be a touch panel, used to detect operation commands on the touch panel. The user interface 33 can also be a physical button or a mouse.

[0121] Several functions of the vehicle 100 are controlled and implemented by the computer system 50. The computer system 50 may include one or more processors 51 (the figure shows one processor as an example) and a memory 52 (also called a storage device). In practical applications, the memory 52 may be located inside the computer system 50 or outside the computer system 50, for example, as a cache in the vehicle 100, etc., and this application does not limit it.

[0122] The processor 51 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 51 can be used to execute relevant programs or instructions corresponding to programs stored in the memory 52 to implement the corresponding functions of the vehicle 1. Furthermore, the computer system 50 may include the aforementioned vehicle-powered sleep / wake-up system 10.

[0123] The memory 52 may include volatile memory, such as RAM; it may also include non-volatile memory, such as ROM, flash memory, HDD, or SSD; or it may include a combination of the above types of memory. The memory 52 can be used to store a set of program code or instructions corresponding to the program code, so that the processor 51 can call the program code or instructions stored in the memory 52 to implement the corresponding functions of the vehicle 1. This function includes, but is not limited to, […]. Figure 5 The functional framework diagram of vehicle 100 shown includes some or all of the functions.

[0124] It should be noted that the above Figure 5 This is merely a schematic diagram of one possible functional framework for vehicle 100. In practical applications, vehicle 100 may include more or fewer systems or components, and this application does not impose any limitations.

[0125] In the accompanying drawings, some structural or methodological features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be necessary. Rather, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. Furthermore, the inclusion of structural or methodological features in a particular figure does not imply that such features are required in all embodiments, and in some embodiments, these features may be omitted or may be combined with other features.

[0126] It should be noted that all units / modules mentioned in the device embodiments of this application are logical units / modules. Physically, a logical unit / module can be a physical unit / module, a part of a physical unit / module, or a combination of multiple physical units / modules. The physical implementation of these logical units / modules themselves is not the most important factor; the combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed in this application. Furthermore, to highlight the innovative aspects of this application, the above-described device embodiments of this application have not introduced units / modules that are not closely related to solving the technical problems proposed in this application. This does not mean that the above-described device embodiments do not contain other units / modules.

[0127] It should be noted that in the examples and description of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0128] Although this application has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made thereto without departing from the spirit and scope of this application.

Claims

1. A vehicle power supply sleep / wake-up system, characterized in that, The vehicle power supply sleep-wake system includes: a step-down converter circuit, a power management circuit, a CAN sleep power supply circuit, and a CAN transceiver. The CAN sleep power supply circuit is connected to the CAN transceiver, and is used to input power voltage, convert the power voltage into a first output voltage, and continuously output the first output voltage to the CAN transceiver; The CAN transceiver is connected to the buck converter circuit and is used to input a CAN wake-up signal. When the CAN transceiver is in a sleep state, it wakes up the CAN transceiver based on the CAN wake-up signal and outputs a sleep wake-up signal to the buck converter circuit. The buck converter circuit is also connected to the power management circuit for inputting power supply voltage. When the buck converter circuit is in a sleep state, it is woken up by the sleep wake-up signal and the power supply voltage is converted into a second output voltage. The second output voltage is then used to supply power to the power management circuit and the CAN transceiver.

2. The system according to claim 1, characterized in that, The first output voltage is less than the second output voltage, and the first output voltage is greater than the set power supply voltage of the CAN transceiver.

3. The system according to claim 1 or 2, characterized in that, The CAN sleep power supply circuit is a low dropout linear regulator (LDO) circuit.

4. The system according to claim 3, characterized in that, The CAN sleep power supply circuit includes: a resistor, a transistor circuit, a Zener diode, a first capacitor, and a second capacitor. The first end of the resistor is connected to the constantly powered wire KL30 and the collector of the transistor circuit, and the second end of the resistor is connected to the cathode of the Zener diode and the first end of the first capacitor. The base of the transistor circuit is connected to the first terminal of the capacitor, and the emitter of the transistor circuit is connected to the first terminal of the second capacitor and the CAN transceiver. The second terminal of the first capacitor and the second terminal of the second capacitor are both grounded.

5. The system according to claim 4, characterized in that, The Zener diode is a Zener diode with a voltage rating of less than 24V.

6. The system according to any one of claims 1 to 5, characterized in that, A first switching diode is provided between the CAN sleep power supply circuit and the CAN transceiver. The positive terminal of the first switching diode is connected to the CAN sleep power supply circuit, and the negative terminal of the first switching diode is connected to the CAN transceiver. The third output voltage, after adjustment of the first output voltage, is applied to the CAN transceiver through the first switching diode.

7. The system according to claim 6, characterized in that, The first switching diode is a switching diode with a withstand voltage greater than 16V.

8. The system according to claim 4, characterized in that, A second switching diode and a third capacitor are provided between the constant power line and the CAN sleep power supply circuit. The positive terminal of the second switching diode is connected to the constant power line and the first terminal of the third capacitor, and the second terminal of the third capacitor is connected to the positive terminal of the Zener diode.

9. The system according to claim 8, characterized in that, The second switching diode is a switching diode with a withstand voltage greater than 60V.

10. The system according to any one of claims 5 to 9, characterized in that, A third switching diode is provided between the buck converter circuit and the CAN transceiver. The positive terminal of the third switching diode is connected to the buck converter circuit, and the negative terminal of the third switching diode is connected to the CAN transceiver. The fourth output voltage, after adjustment of the second output voltage, is applied to the CAN transceiver through the third switching diode.

11. The system according to any one of claims 5 to 9, characterized in that, A fourth switching diode is provided between the buck converter circuit and the CAN transceiver. The positive terminal of the fourth switching diode is connected to the suppression pin of the CAN transceiver, and the negative terminal of the fourth switching diode is connected to the buck converter circuit. The sleep / wake-up signal is transmitted to the buck converter circuit through the fourth switching diode.

12. The system according to claim 1, characterized in that, The system includes a CAN sleep power supply circuit and multiple CAN transceivers, wherein each CAN transceiver is one of the multiple CAN transceivers and is connected to the CAN sleep power supply circuit.

13. The system according to claim 1, characterized in that, The system includes multiple CAN sleep power supply circuits and multiple CAN transceivers. The CAN sleep power supply circuit is one of the multiple CAN sleep power supply circuits, and the CAN transceiver is one of the multiple CAN transceivers. Each CAN transceiver is connected to one CAN sleep power supply circuit. Each CAN sleep power supply circuit is connected to a live wire, and each CAN transceiver is connected to the buck converter circuit.

14. The system according to claim 1, characterized in that, The CAN transceiver is used to connect the electronic control unit (ECU) and / or the on-board terminal device (T-BOX) in the vehicle via the CAN bus.

15. The system according to any one of claims 1 to 14, characterized in that, The CAN sleep power supply circuit is connected to a 48V power supply via a constant live wire. The power supply voltage is the output voltage of the 48V power supply. The step-down converter circuit is a step-down circuit used to convert 48V to 12V. The second output voltage is the output voltage of the step-down circuit.

16. A vehicle, characterized in that, Includes the vehicle power supply sleep-wake system as described in any one of claims 1 to 15.

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