Multi-bus wake-up circuit and system and automobile

Abstract

The utility model relates to the technical field of circuit control, in particular to a multi-bus wake-up circuit, a multi-bus wake-up system and an automobile. The multi-bus wake-up circuit comprises an Ethernet conversion chip, a CAN conversion chip and a power supply wake-up module. The input end of the Ethernet conversion chip is connected with an Ethernet bus, the output end of the Ethernet conversion chip is connected with the first end of the power supply awakening module, the input end of the CAN conversion chip is connected with a CAN bus, the output end of the CAN conversion chip is connected with the second end of the power supply awakening module, and the third end of the power supply awakening module is connected with a system power supply. The fourth end of the power supply awakening module is connected with the load; and the power supply wake-up module is used for driving a system power supply to supply power to a load when receiving the Ethernet wake-up signal and / or the CAN wake-up signal. Ethernet wake-up and CAN wake-up are compatible, so that dormancy and work of automobile parts are controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit control, in particular to a multi-bus wake-up circuit, a system and an automobile. Background Technique

[0002] The usage scenarios of modern automobiles are becoming more and more diverse, and the intelligent control is becoming more and more complex. Therefore, it also involves the wake-up and activation functions of various in-vehicle devices under specific conditions. It can be to receive a specific signal, detect the user's operation, or receive an instruction sent by other nodes on the network before performing the power supply control of the corresponding electrical device. This can save energy consumption and extend the battery life.

[0003] At present, a single automotive component generally only adopts one bus wake-up method, such as Ethernet bus wake-up, CAN bus wake-up or LIN bus wake-up, etc. Any one of them is selected as the bus wake-up method. The wake-up method is single. Since the signal levels of the Ethernet wake-up signal and the CAN wake-up signal are different, simultaneous wake-up operations will cause mutual influence between the signals, and generally do not support other wake-up methods.

[0004] The above content is only used to assist in understanding the technical solution of the utility model, and does not represent an admission that the above content is prior art. Content of the Utility Model

[0005] The main purpose of the utility model is to provide a multi-bus wake-up circuit, a system and an automobile, aiming to solve the technical problem of the single wake-up method of vehicle components in the prior art.

[0006] To achieve the above purpose, the utility model provides a multi-bus wake-up circuit, including: an Ethernet conversion chip, a CAN conversion chip and a power wake-up module;

[0007] The input end of the Ethernet conversion chip is connected to the Ethernet bus, the output end of the Ethernet conversion chip is connected to the first end of the power wake-up module, the input end of the CAN conversion chip is connected to the CAN bus, the output end of the CAN conversion chip is connected to the second end of the power wake-up module, the third end of the power wake-up module is connected to the system power supply, and the fourth end of the power wake-up module is connected to the load;

[0008] The Ethernet conversion chip is used to generate an Ethernet wake-up signal and transmit it to the power wake-up module when receiving an Ethernet bus signal;

[0009] The CAN conversion chip is used to generate a CAN wake-up signal and transmit it to the power wake-up module when receiving a CAN bus signal;

[0010] The power supply wake-up module is used to drive the system power supply to supply power to the load when receiving the Ethernet wake-up signal and / or the CAN wake-up signal.

[0011] Optionally, the power supply wake-up module includes: an access judgment unit and a switch driving unit;

[0012] The first input end of the access judgment unit is connected to the output end of the Ethernet conversion chip, the second input end of the access judgment unit is connected to the output end of the CAN conversion chip, the output end of the access judgment unit is connected to the control end of the switch driving unit, the input end of the switch driving unit is connected to the system power supply, and the output end of the switch driving unit is connected to the load;

[0013] The access judgment unit is used to generate a conduction control signal and transmit it to the switch driving unit when receiving the Ethernet wake-up signal from the first input end or the CAN wake-up signal from the second input end of the Ethernet conversion chip;

[0014] The switch driving unit is used to conduct the power supply loop of the input end system power supply and the output end when receiving the conduction control signal at the control end.

[0015] Optionally, the access judgment unit includes: a first switch tube, a first resistor, a second resistor, and an anti-backflow device;

[0016] The first end of the first resistor is connected to the output end of the Ethernet conversion chip, the first input end of the second resistor is connected to the output end of the CAN conversion chip, the second end of the first resistor is connected to the first input end of the anti-backflow device, the second end of the first resistor is connected to the first input end of the anti-backflow device, the second end of the second resistor is connected to the second input end of the anti-backflow device, the output end of the anti-backflow device is connected to the control end of the first switch tube, the input end of the first switch tube is connected to the control end of the switch driving unit, and the output end of the first switch tube is grounded.

[0017] Optionally, the anti-backflow device includes: a first anti-reverse diode and a second anti-reverse diode;

[0018] The anode of the first anti-reverse diode is connected to the output end of the Ethernet conversion chip, the anode of the second anti-reverse diode is connected to the output end of the CAN conversion chip, and the cathode of the first anti-reverse diode is simultaneously connected to the cathode of the second anti-reverse diode and the control end of the first switch tube.

[0019] Optionally, the access judgment unit further includes: a first capacitor;

[0020] One end of the first capacitor is connected to the control end of the first switching transistor, and the other end of the first capacitor is connected to the output end of the first switching transistor.

[0021] Optionally, the switch driving unit includes: a second switching transistor and a voltage divider;

[0022] The first end of the voltage divider is simultaneously connected to the system power supply and the input end of the second switching transistor, the second end of the voltage divider is connected to the control end of the second switching transistor, the third end of the voltage divider is connected to the output end of the access judgment unit, and the output end of the second switching transistor is connected to the load.

[0023] Optionally, the voltage divider includes: a third resistor and a fourth resistor;

[0024] The first end of the third resistor is connected to the system power supply, the second end of the third resistor is simultaneously connected to the first end of the fourth resistor and the control end of the second switching transistor, and the second end of the fourth resistor is connected to the output end of the access judgment unit.

[0025] Optionally, the multi-bus wake-up circuit further includes: a voltage conversion chip;

[0026] The input end of the voltage conversion chip is connected to the system power supply, and the output end of the voltage conversion chip is connected to the Ethernet conversion chip;

[0027] The voltage conversion chip is configured to convert the system power supply voltage drop into the operating power supply voltage for driving the Ethernet conversion chip.

[0028] In addition, to achieve the above object, the present invention further provides a multi-bus wake-up system, and the multi-bus wake-up system includes: the multi-bus wake-up circuit as described above

[0029] In addition, to achieve the above object, the present invention further provides a vehicle, and the vehicle includes: the multi-bus wake-up system as described above.

[0030] The technical solution of the present utility model proposes a multi-bus wake-up circuit, system and vehicle. The multi-bus wake-up circuit includes an Ethernet conversion chip, a CAN conversion chip and a power supply wake-up module; the input end of the Ethernet conversion chip is connected to the Ethernet bus, the output end of the Ethernet conversion chip is connected to the first end of the power supply wake-up module, the input end of the CAN conversion chip is connected to the CAN bus, the output end of the CAN conversion chip is connected to the second end of the power supply wake-up module, the third end of the power supply wake-up module is connected to the system power supply, and the fourth end of the power supply wake-up module is connected to the load; the Ethernet conversion chip is configured to generate an Ethernet wake-up signal and transmit it to the power supply wake-up module when receiving an Ethernet bus signal; the CAN conversion chip is configured to generate a CAN wake-up signal and transmit it to the power supply wake-up module when receiving a CAN bus signal; the power supply wake-up module is configured to drive the system power supply to supply power to the load when receiving the Ethernet wake-up signal and / or the CAN wake-up signal. By being compatible with Ethernet wake-up and CAN wake-up, the dormancy and operation of automotive components are controlled. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0032] Figure 1 It is a schematic structural diagram of the first embodiment of the multi-bus wake-up circuit of the present utility model;

[0033] Figure 2 It is a circuit connection diagram of the second embodiment of the multi-bus wake-up circuit of the present utility model;

[0034] Figure 3 It is a schematic functional module diagram of an embodiment of the multi-bus wake-up system of the present utility model.

[0035] The realization, functional characteristics and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments

[0036] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Refer to Figure 1 , Figure 1 which is a schematic structural diagram of the first embodiment of the multi-bus wake-up circuit of the present invention.

[0041] The present invention proposes a first embodiment of a multi-bus wake-up circuit.

[0042] In this embodiment, the multi-bus wake-up circuit includes an Ethernet conversion chip 10, a CAN conversion chip 20, and a power supply wake-up module 30; the input end of the Ethernet conversion chip 10 is connected to the Ethernet bus, the output end of the Ethernet conversion chip 10 is connected to the first end of the power supply wake-up module 30, the input end of the CAN conversion chip 20 is connected to the CAN bus, the output end of the CAN conversion chip 20 is connected to the second end of the power supply wake-up module 30, the third end of the power supply wake-up module 30 is connected to the system power supply (refer to VI in the figure), and the fourth end of the power supply wake-up module 30 is connected to the load.

[0043] It should be noted that the Ethernet conversion chip 10 can be used to generate an Ethernet wake-up signal and transmit it to the power supply wake-up module 30 when receiving an Ethernet bus signal; the CAN conversion chip 20 can be used to generate a CAN wake-up signal and transmit it to the power supply wake-up module 30 when receiving a CAN bus signal; the power supply wake-up module 30 can be used to drive the system power supply to supply power to the load when receiving the Ethernet wake-up signal and / or the CAN wake-up signal.

[0044] It should be understood that the Ethernet bus can support point-to-point, multicast, and broadcast communication modes. Each terminal node is connected through a switch to form a network. The CAN bus can use broadcast communication. Information sent by one node will be received by all nodes on the bus, and the receiving node decides whether to process the information. Since different trigger event information types are different, two communication buses are set on the vehicle, and different communication buses are selected for transmission. By setting the Ethernet conversion chip 10 and the CAN conversion chip 20, both types of communication buses can wake up the load device. The Ethernet conversion chip 10 and the CAN conversion chip 20 can use a gateway chip or a single-chip microcomputer chip to generate wake-up signals when there are signal inputs on the corresponding Ethernet bus and CAN bus. Among them, since the voltage amplitudes are different when the two buses are transmitting, the amplitude of the Ethernet wake-up signal generated by the Ethernet conversion chip 10 and the amplitude of the CAN wake-up signal generated by the CAN conversion chip 20 can also be different. (For example, the Ethernet wake-up signal can be set to 3.3V while the amplitude of the CAN wake-up signal is 12V). At this time, the multi-bus wake-up circuit can further include: a voltage conversion chip 40; the input end of the voltage conversion chip 40 is connected to the system power supply, and the output end of the voltage conversion chip 40 is connected to the Ethernet conversion chip 10; the voltage conversion chip 40 can be used to convert the system power supply voltage drop into the working power supply voltage for driving the Ethernet conversion chip 10. The voltage conversion chip 40 can use an electronic device with a voltage drop function, such as a low dropout regulator (LDO) or a resistor voltage division step-down circuit.

[0045] Furthermore, the power supply wake-up module 30 can convert the system power supply into a power supply for the corresponding load when receiving an Ethernet wake-up signal or a CAN wake-up signal, thereby waking up the corresponding load to execute functions. The wake-up effect can also be achieved when both the Ethernet wake-up signal and the CAN wake-up signal are received simultaneously.

[0046] This embodiment proposes a multi-bus wake-up circuit, system, and vehicle. The multi-bus wake-up circuit includes an Ethernet conversion chip, a CAN conversion chip, and a power wake-up module; the input end of the Ethernet conversion chip is connected to the Ethernet bus, the output end of the Ethernet conversion chip is connected to the first end of the power wake-up module, the input end of the CAN conversion chip is connected to the CAN bus, the output end of the CAN conversion chip is connected to the second end of the power wake-up module, the third end of the power wake-up module is connected to the system power supply, and the fourth end of the power wake-up module is connected to the load; the Ethernet conversion chip is configured to generate an Ethernet wake-up signal and transmit it to the power wake-up module when receiving an Ethernet bus signal; the CAN conversion chip is configured to generate a CAN wake-up signal and transmit it to the power wake-up module when receiving a CAN bus signal; the power wake-up module is configured to drive the system power supply to supply power to the load when receiving the Ethernet wake-up signal and / or the CAN wake-up signal. By being compatible with Ethernet wake-up and CAN wake-up, the dormancy and operation of vehicle components are controlled.

[0047] Referring to Figure 2 , Figure 2 is the circuit connection diagram of the second embodiment of the multi-bus wake-up circuit of the present invention. The second embodiment of the multi-bus wake-up circuit of the present invention is proposed based on the first embodiment of the above multi-bus wake-up circuit.

[0048] In this embodiment, the power wake-up module 30 includes: an access judgment unit 301 and a switch driving unit 302; the first input end of the access judgment unit 301 is connected to the output end of the Ethernet conversion chip 10, the second input end of the access judgment unit 301 is connected to the output end of the CAN conversion chip 20, the output end of the access judgment unit 301 is connected to the control end of the switch driving unit 302, the input end of the switch driving unit 302 is connected to the system power supply, and the output end of the switch driving unit 302 is connected to the load.

[0049] It should be noted that the access judgment unit 301 can be configured to generate a conduction control signal and transmit it to the switch driving unit 302 when receiving the Ethernet wake-up signal of the Ethernet conversion chip 10 at the first input end or the CAN wake-up signal of the CAN conversion chip 20 at the second input end; the switch driving unit 302 can be configured to conduct the power supply loop of the input end system power supply and the output end when receiving the conduction control signal at the control end.

[0050] It should be understood that the access judgment unit 301 may include: a first switching transistor Q1, a first resistor R1, a second resistor R2, and an anti-backflow device. The first end of the first resistor R1 is connected to the output end of the Ethernet conversion chip 10, the first input end of the second resistor R2 is connected to the output end of the CAN conversion chip 20, the second end of the first resistor R1 is connected to the first input end of the anti-backflow device, the second end of the first resistor R1 is connected to the first input end of the anti-backflow device, the second end of the second resistor R2 is connected to the second input end of the anti-backflow device, the output end of the anti-backflow device is connected to the control end of the first switching transistor Q1, the input end of the first switching transistor Q1 is connected to the control end of the switch driving unit 302, and the output end of the first switching transistor Q1 is grounded. Among them, the first switching transistor Q1 can be an NPN-type triode.

[0051] Furthermore, the access judgment unit can also adopt a single-chip microcomputer chip control circuit to generate a conduction control signal at the output end when a signal is received at the input end.

[0052] It should be noted that the anti-backflow device can be an electronic device that allows the voltage of the Ethernet wake-up signal and the CAN wake-up signal to flow unidirectionally. For example, it can be implemented by using an operational amplifier circuit or a semiconductor device to avoid component damage caused by the transmission of the Ethernet wake-up signal voltage to the CAN conversion chip or the transmission of the CAN wake-up signal voltage to the Ethernet conversion chip.

[0053] Among them, the anti-backflow device may include: a first anti-reverse diode D1 and a second anti-reverse diode D2; the anode of the first anti-reverse diode D1 is connected to the output end of the Ethernet conversion chip 10, the anode of the second anti-reverse diode D2 is connected to the output end of the CAN conversion chip 20, and the cathode of the first anti-reverse diode D1 is simultaneously connected to the cathode of the second anti-reverse diode D2 and the control end of the first switching transistor Q1.

[0054] Furthermore, the access judgment unit 301 may also include: a first capacitor C1; one end of the first capacitor C1 is connected to the control end of the first switching transistor Q1, and the other end of the first capacitor C1 is connected to the output end of the first switching transistor Q1.

[0055] It should be noted that by setting the capacitor, the voltage change transmitted to the base of the first switching transistor Q1 becomes smoother, avoiding device damage caused by voltage distortion. Other rectifying and filtering devices can also be set to achieve a similar effect, such as a zener diode.

[0056] Further, the switch driving unit 302 may include: a second switching transistor Q2 and a voltage divider; a first end of the voltage divider is connected to the system power supply and an input end of the second switching transistor at the same time, a second end of the voltage divider is connected to a control end of the second switching transistor, a third end of the voltage divider is connected to an output end of the access judgment unit, and an output end of the second switching transistor is connected to the load. Among them, the second switching transistor Q2 may be a PMOS transistor.

[0057] It should be noted that the voltage divider may be an electronic device that converts a conduction control signal into a threshold voltage for driving the on / off of the second switching transistor and has a voltage regulation function. The voltage divider may include: a third resistor R3 and a fourth resistor R4; a first end of the third resistor R3 is connected to the system power supply, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4 and a control end of the second switching transistor Q2 at the same time, and a second end of the fourth resistor R4 is connected to an output end of the access judgment unit 301.

[0058] It should be understood that when both the Ethernet wake-up signal and the CAN wake-up signal are floating (i.e., at this time, both the CAN bus and the Ethernet bus are in the sleep state): the first switching transistor Q1 is not conducting, there is no potential difference between the gate and the source of the second switching transistor Q2, and it is pulled up to the system power supply, so the second switching transistor is not conducting, and there is no current on the load. When the CAN wake-up signal is 12V and the Ethernet wake-up signal is 3.3V (i.e., at this time, both the CAN bus and the Ethernet bus are in the wake-up state): the base of the first switching transistor Q1 is 12V, and the first switching transistor Q1 conducts (at this time, due to the anti-backflow function of the anti-backflow diode, the 12V voltage will not affect the Ethernet conversion chip), the collector and the emitter of the first switching transistor Q1 conduct, and the voltage is 0V. After the third resistor R3 and the fourth resistor R4 divide the voltage, the voltage difference between the gate and the source of the second switching transistor Q2 can be 6V, and the second switching transistor Q2 conducts, and the load gets powered on and wakes up. When the CAN wake-up signal is 12V and the Ethernet wake-up signal is floating (i.e., at this time, the CAN bus is in the wake-up state and the Ethernet bus is in the sleep state): the base of the first switching transistor Q1 is 12V, and the first switching transistor Q1 conducts (at this time, due to the anti-backflow function of the anti-backflow diode, the 12V voltage will not affect the Ethernet conversion chip), the collector and the emitter of the first switching transistor Q1 conduct, and the voltage is 0V. After the third resistor R3 and the fourth resistor R4 divide the voltage, the voltage difference between the gate and the source of the second switching transistor Q2 can be 6V, and the second switching transistor Q2 conducts, and the load gets powered on and wakes up. When the CAN wake-up signal is floating and the Ethernet wake-up signal is 3.3V (i.e., at this time, the CAN bus is in the sleep state and the Ethernet bus is in the wake-up state): the base of the first switching transistor Q1 is 3.3V, and the first switching transistor Q1 conducts (at this time, due to the anti-backflow function of the anti-backflow diode, the 3.3V voltage will not affect the CAN conversion chip), the collector and the emitter of the first switching transistor Q1 conduct, and the voltage is 0V. After the third resistor R3 and the fourth resistor R4 divide the voltage, the voltage difference between the gate and the source of the second switching transistor Q2 can be 6V, and the second switching transistor Q2 conducts, and the load gets powered on and wakes up.

[0059] In this embodiment, an access judgment unit including a first switching transistor, a first resistor, a second resistor, and an anti-backflow device is provided; at the same time, a switch driving unit including a second switching transistor and a voltage divider is also provided. The access judgment unit is used to generate a conduction control signal and transmit it to the switch driving unit when an Ethernet wake-up signal of the Ethernet conversion chip is received at the first input end or a CAN wake-up signal of the CAN conversion chip is received at the second input end; the switch driving unit is used to conduct the power supply loop of the input end system power supply and the output end when a conduction control signal is received at the control end. It is compatible with the Ethernet wake-up and CAN wake-up functions. At the same time, a hardware circuit is formed with fewer components to platformize the hardware circuit, reduce the development cost, and improve the production efficiency. And the two wake-up signals do not interfere with each other, meeting the isolation requirements and installation environment of automotive component tests.

[0060] In addition, an embodiment of the present utility model further provides a multi-bus wake-up system. Referring to Figure 3 , Figure 3 which is a schematic diagram of the functional modules of an embodiment of the multi-bus wake-up system of the present utility model. The multi-bus wake-up system includes the above-mentioned multi-bus wake-up circuit.

[0061] In addition, an embodiment of the present utility model further provides a vehicle, which includes the above-mentioned multi-bus wake-up system.

[0062] Since both the multi-bus wake-up system and the vehicle adopt all the technical solutions of all the above embodiments, they at least have all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0063] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the inventive concept of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A multi-bus wake-up circuit, characterized in that: The multi-bus wake-up circuit includes: an Ethernet conversion chip, a CAN conversion chip and a power wake-up module; The input end of the Ethernet conversion chip is connected to the Ethernet bus, the output end of the Ethernet conversion chip is connected to the first end of the power wake-up module, the input end of the CAN conversion chip is connected to the CAN bus, the output end of the CAN conversion chip is connected to the second end of the power wake-up module, the third end of the power wake-up module is connected to the system power supply, and the fourth end of the power wake-up module is connected to the load; The Ethernet conversion chip is used to generate an Ethernet wake-up signal and transmit it to the power wake-up module when receiving an Ethernet bus signal; The CAN conversion chip is used to generate a CAN wake-up signal and transmit it to the power wake-up module when receiving a CAN bus signal; The power wake-up module is used to drive the system power supply to supply power to the load when receiving the Ethernet wake-up signal and / or the CAN wake-up signal.

2. The multi-bus wake-up circuit according to claim 1, characterized in that: The power wake-up module includes: an access judgment unit and a switch driving unit; The first input end of the access judgment unit is connected to the output end of the Ethernet conversion chip, the second input end of the access judgment unit is connected to the output end of the CAN conversion chip, the output end of the access judgment unit is connected to the control end of the switch drive unit, the input end of the switch drive unit is connected to the system power supply, and the output end of the switch drive unit is connected to the load; The access determination unit is configured to generate a conduction control signal and transmit it to the switch driving unit when the first input terminal receives an Ethernet wake-up signal from the Ethernet conversion chip or the second input terminal receives a CAN wake-up signal from the CAN conversion chip; The switch driving unit is used to turn on the input end system power supply and the output end power supply circuit when the control end receives the conduction control signal.

3. The multi-bus wake-up circuit as claimed in claim 2, characterized in that: The access determination unit includes: a first switch tube, a first resistor, a second resistor and an anti-backflow device; The first end of the first resistor is connected to the output end of the Ethernet conversion chip, the first input end of the second resistor is connected to the output end of the CAN conversion chip, the second end of the first resistor is connected to the first input end of the anti-backflow device, the second end of the first resistor is connected to the first input end of the anti-backflow device, the second end of the second resistor is connected to the second input end of the anti-backflow device, the output end of the anti-backflow device is connected to the control end of the first switch tube, the input end of the first switch tube is connected to the control end of the switch drive unit, and the output end of the first switch tube is grounded.

4. The multi-bus wake-up circuit as claimed in claim 3, characterized in that: The anti-backflow device comprises: a first anti-backflow diode and a second anti-backflow diode; The anode of the first anti-reverse diode is connected to the output end of the Ethernet conversion chip, the anode of the second anti-reverse diode is connected to the output end of the CAN conversion chip, and the cathode of the first anti-reverse diode is simultaneously connected to the cathode of the second anti-reverse diode and the control end of the first switch tube.

5. The multi-bus wake-up circuit as claimed in claim 3, characterized in that: The access determination unit further includes: a first capacitor; One end of the first capacitor is connected to the control end of the first switch tube, and the other end of the first capacitor is connected to the output end of the first switch tube.

6. The multi-bus wake-up circuit as claimed in claim 2, characterized in that: The switch driving unit comprises: a second switch tube and a voltage divider; The first end of the voltage divider is connected to the system power supply and the input end of the second switch tube at the same time, the second end of the voltage divider is connected to the control end of the second switch tube, the third end of the voltage divider is connected to the output end of the access judgment unit, and the output end of the second switch tube is connected to the load.

7. The multi-bus wake-up circuit according to claim 6, characterized in that: The voltage divider comprises: a third resistor and a fourth resistor; The first end of the third resistor is connected to the system power supply, the second end of the third resistor is connected to the first end of the fourth resistor and the control end of the second switch tube, and the second end of the fourth resistor is connected to the output end of the access judgment unit.

8. The multi-bus wake-up circuit according to claim 1, characterized in that: The multi-bus wake-up circuit further includes: a voltage conversion chip; The input end of the voltage conversion chip is connected to the system power supply, and the output end of the voltage conversion chip is connected to the Ethernet conversion chip; The voltage conversion chip is used to convert the system power supply voltage drop into a working power supply voltage that drives the Ethernet conversion chip.

9. A multi-bus wake-up system, characterized in that: The multi-bus wake-up system comprises the multi-bus wake-up circuit as described in any one of claims 1-8.

10. An automobile, characterized in that: The automobile comprises the multi-bus wake-up system as claimed in claim 9.

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