Intelligent power distribution box and vehicle

Abstract

The utility model provides an intelligent distribution box and a vehicle, the intelligent distribution box comprises a power supply input interface, a system control module and a load output interface, the power supply input interface is used for connecting a vehicle end power supply module, the load output interface is used for connecting an external load, and the system control module at least comprises an MCU and a CAN communication unit. The MCU is connected with the vehicle end controller through the CAN communication unit, a power supply inlet EMC protection circuit is arranged between the power supply input interface and the system control module, a CAN communication EMC protection circuit is arranged between the CAN communication unit and the vehicle end controller, and an output port EMC protection circuit is arranged between the system control module and the load output interface. According to the intelligent distribution box disclosed by the invention, the EMC protection capability of the intelligent distribution box is effectively improved, and meanwhile, the EMI and EMS aspects are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle power distribution, in particular to an intelligent power distribution box and a vehicle. Background Art

[0002] With the continuous advancement of science and technology, the research and development of automobiles has gradually developed towards the direction of technology, intelligence, and safety. The power distribution box, as the distribution center of battery energy, can achieve the rational distribution of current in each circuit. In addition, in the automotive electronics field, it can also serve as an information processing center, receiving status signals from various electronic devices and issuing control signals to respond accordingly. This requires the power distribution box to have a higher level of protection. For example, in terms of EMC (Electromagnetic Compatibility), it must meet the CISPR 25 standard and ISO 7637 standard. Therefore, technical personnel in this field need to make further improvements to the EMC protection of intelligent power distribution boxes to meet the higher protection requirements. Utility Model Content

[0003] The embodiments of the present disclosure provide a smart distribution box and a vehicle to at least partially solve the above-mentioned problems.

[0004] On the one hand, the present disclosure proposes an intelligent distribution box, including a power input interface, a system control module and a load output interface, wherein the power input interface is used to connect to a vehicle-side power supply module, and the load output interface is used to connect to an external load. The system control module includes at least an MCU and a CAN communication unit, and the MCU is connected to the vehicle-side controller through the CAN communication unit. A power supply inlet EMC protection circuit is provided between the power input interface and the system control module, a CAN communication EMC protection circuit is provided between the CAN communication unit and the vehicle-side controller, and an output port EMC protection circuit is provided between the system control module and the load output interface.

[0005] Preferably, the power supply inlet EMC protection circuit includes a surge protection circuit, a common mode filter circuit and a differential mode filter circuit which are connected in sequence starting from the power input interface.

[0006] Preferably, the surge protection circuit includes a first resistor and a first diode pair connected in series between the positive and negative poles of the vehicle-end power supply module, and the first diode pair includes a Schottky diode and a low-impedance current-limiting diode connected in series.

[0007] Preferably, the common-mode filtering circuit includes a first common-mode inductor, the first resistor and the first diode pair connected in series are connected between the first input end and the second input end of the first common-mode inductor, the first output end of the first common-mode inductor is connected to the input end of the differential-mode filtering circuit, and the second output end of the first common-mode inductor is connected to the system ground of the system control module.

[0008] Preferably, the differential mode filter circuit includes a plurality of differential mode filter capacitors connected in parallel, one end of the plurality of differential mode filter capacitors connected in parallel is connected to the power input end of the system control module, and the other end is connected to the system ground.

[0009] Preferably, an anti-reverse connection circuit is further provided between the first common-mode inductor and the differential-mode filter circuit. The anti-reverse connection circuit includes a first MOS transistor, a voltage-stabilizing diode, a third resistor, and a fourth resistor. The drain of the first MOS transistor is connected to the second output end, the gate of the first MOS transistor is connected to the system ground through the fourth resistor, and is connected to the input end of the differential-mode filter circuit through the third resistor. The voltage-stabilizing diode is connected between the gate of the first MOS transistor and the system ground, and the source of the first MOS transistor is connected to the system ground.

[0010] Preferably, the output port EMC protection circuit includes a second resistor and a second diode pair connected in series between the positive and negative poles of the vehicle-end power supply module, and the second diode pair includes a Schottky diode and a low-impedance current-limiting diode connected in series.

[0011] Preferably, the CAN communication EMC protection circuit includes a second common-mode inductor, the first input end and the first output end of the second common-mode inductor are respectively connected to the CAN high-speed line between the vehicle-end controller and the CAN communication unit, and the second input end and the second output end of the second common-mode inductor are respectively connected to the CAN low-speed line between the vehicle-end controller and the CAN communication unit.

[0012] Preferably, the CAN communication EMC protection circuit also includes an ESD diode pair and a differential mode filter capacitor arranged between the second common mode inductor and the vehicle-end controller, and the ESD diode pair is arranged between the CAN high-speed line and the power ground and between the CAN low-speed line and the power ground; the differential mode filter capacitor is arranged between the CAN high-speed line and the power ground and between the CAN low-speed line and the power ground.

[0013] Another aspect of the present disclosure provides a vehicle, comprising the intelligent distribution box according to any of the above embodiments.

[0014] According to the intelligent distribution box disclosed in the present invention, the EMC protection capability of the intelligent distribution box is effectively improved, and EMI (Electromagnetic Interference) and EMS (Electromagnetic Susceptibility) are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 This is a circuit principle block diagram of the intelligent distribution box according to the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present disclosure are described below in conjunction with the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure and are not used to limit the present disclosure. In addition, the embodiments and features in the embodiments of the present disclosure may be combined with each other if no conflict occurs.

[0018] like Figure 1 As shown, the present disclosure provides an intelligent distribution box of a preferred embodiment, including a power input interface, a system control module and a load output interface. The power input interface is used to connect to the vehicle-end power supply module, where the vehicle-end power supply module can be a battery or a 12V vehicle-mounted power supply. The load output interface is used to connect to an external load. The system control module includes at least an MCU and a CAN communication unit. It can be understood that the system control module should also have basic electronic devices and circuits to realize monitoring, control and other functions during the power distribution process of the whole vehicle. The MCU is connected to the vehicle-end controller (not shown in the figure) through the CAN communication unit. A power supply inlet EMC protection circuit is provided between the power input interface and the system control module, a CAN communication EMC protection circuit is provided between the CAN communication unit and the vehicle-end controller, and an output port EMC protection circuit is provided between the system control module and the load output interface.

[0019] In some embodiments, the power supply inlet EMC protection circuit includes a surge protection circuit, a common mode filter circuit, and a differential mode filter circuit connected in sequence starting from the power input interface.

[0020] Specifically, if Figure 1As shown, the surge protection circuit includes a first resistor R1 and a first diode pair D1 connected in series between the positive and negative terminals of the vehicle-side power supply module. The first diode pair D1 includes a Schottky diode and a low-impedance current-limiting diode connected in series. Thus, the series connection of the Schottky diode and the low-impedance current-limiting diode can effectively protect against high-power input surges and low-power input ESD (electrostatic discharge).

[0021] Specifically, if Figure 1 As shown, the common-mode filter circuit includes a first common-mode inductor L1, a first resistor R1 and a first diode pair D1 connected in series between the first input and second input terminals of the first common-mode inductor L1, a first output terminal of the first common-mode inductor L1 connected to the input terminal of the differential-mode filter circuit, and a second output terminal of the first common-mode inductor L1 connected to the system ground of the system control module. Thus, the first common-mode inductor L1 can effectively suppress interference signals from the common-mode input and system output. It is understood that the system ground of the system control module can be the system ground of the system power module within the system control module.

[0022] Specifically, the differential-mode filter circuit includes multiple differential-mode filter capacitors (fifth capacitor C5, sixth capacitor C6, and seventh capacitor C7) connected in parallel. One end of these differential-mode filter capacitors is connected to the power input of the system control module, and the other end is connected to the system ground. Thus, the parallel multi-stage differential-mode filter capacitors provide a certain degree of filtering against differential-mode interference from the power input or system output.

[0023] like Figure 1 As shown, a reverse connection protection circuit is provided between the first common-mode inductor L1 and the differential-mode filter circuit. The reverse connection protection circuit includes a first MOS transistor Q1, a voltage-stabilizing diode ZD1, a third resistor R3, and a fourth resistor R4. The drain of the first MOS transistor Q1 is connected to the second output terminal of the first common-mode inductor L1. The gate of the first MOS transistor Q1 is connected to the system ground via the fourth resistor R4 and to the input terminal of the differential-mode filter circuit via the third resistor R3. The voltage-stabilizing diode ZD1 is connected between the gate of the first MOS transistor Q1 and the system ground, and the source of the first MOS transistor Q1 is connected to the system ground. Therefore, when the power input interface is reversely connected or has a negative voltage input, the first MOS transistor Q1 can effectively cut off the current path, thereby achieving the effect of not damaging the downstream load at the output terminal of the intelligent distribution box.

[0024] like Figure 1 As shown, the output port EMC protection circuit includes a second resistor R2 connected in series between the positive and negative terminals of the vehicle-side power supply module and a second diode pair D2. The second diode pair D2 includes a Schottky diode and a low-impedance current-limiting diode connected in series. This effectively protects against both surges and low-power ESD ingress at the output terminal of high-power loads.

[0025] like Figure 1 As shown, the CAN communication EMC protection circuit includes a second common-mode inductor L2. The first input and first output of the second common-mode inductor L2 are respectively connected to the CAN high-speed line between the vehicle-side controller and the CAN communication unit. The second input and second output of the second common-mode inductor L2 are respectively connected to the CAN low-speed line between the vehicle-side controller and the CAN communication unit. This effectively suppresses interference signals from the common-mode input and system output.

[0026] Specifically, the CAN communication EMC protection circuit also includes an ESD diode pair D3 and differential-mode filter capacitors (ninth capacitor C9 and tenth capacitor C10) arranged between the second common-mode inductor L2 and the vehicle-end controller. The ESD diode pair D3 is set between the CAN high-speed line and the power ground (the power ground of the vehicle-end power supply module, which can be understood as the power ground of the power battery pack) and between the CAN low-speed line and the power ground; and the differential-mode filter capacitors are set between the CAN high-speed line and the power ground and between the CAN low-speed line and the power ground. This effectively protects the power input interface from ESD.

[0027] Specifically, the CAN communication EMC protection circuit also includes differential-mode filter capacitors (eighth capacitor C8 and eleventh capacitor C11) arranged between the second common-mode inductor L2 and the CAN communication unit. These differential-mode filter capacitors are also provided between the CAN high-speed line and system ground, as well as between the CAN low-speed line and system ground. This provides a certain degree of filtering against differential-mode interference from the power input or system output.

[0028] Another aspect of the present disclosure provides a vehicle, comprising the intelligent distribution box according to any of the above embodiments.

[0029] According to the intelligent distribution box disclosed in the present invention, the EMC protection capability of the intelligent distribution box is effectively improved, and EMI (Electromagnetic Interference) and EMS (Electromagnetic Susceptibility) are greatly improved.

[0030] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0031] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if such changes and modifications of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such changes and modifications.

[0032] It should also be understood that in the embodiments herein, the term "and / or" merely describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" could represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0033] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0034] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0035] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected based on actual needs to achieve the objectives of the embodiments herein.

[0036] In addition, the functional units in the various embodiments herein may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0037] Specific embodiments are used in this article to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for those skilled in the art, based on the ideas of this article, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation to this article.

Claims

1. An intelligent distribution box, characterized in that: It includes a power input interface, a system control module and a load output interface. The power input interface is used to connect to the vehicle-side power supply module, and the load output interface is used to connect to the external load. The system control module includes at least an MCU and a CAN communication unit. The MCU is connected to the vehicle-side controller through the CAN communication unit. A power supply inlet EMC protection circuit is provided between the power input interface and the system control module, a CAN communication EMC protection circuit is provided between the CAN communication unit and the vehicle-side controller, and an output port EMC protection circuit is provided between the system control module and the load output interface.

2. The intelligent distribution box according to claim 1, characterized in that: The power supply inlet EMC protection circuit includes a surge protection circuit, a common mode filter circuit and a differential mode filter circuit which are connected in sequence starting from the power input interface.

3. The intelligent distribution box according to claim 2, characterized in that: The surge protection circuit includes a first resistor and a first diode pair connected in series between the positive and negative electrodes of the vehicle-end power supply module, and the first diode pair includes a Schottky diode and a low-impedance current-limiting diode connected in series.

4. The intelligent distribution box according to claim 3, characterized in that: The common-mode filter circuit includes a first common-mode inductor, a first resistor and a first diode pair connected in series, connected between a first input terminal and a second input terminal of the first common-mode inductor, a first output terminal of the first common-mode inductor connected to an input terminal of the differential-mode filter circuit, and a second output terminal of the first common-mode inductor connected to a system ground of the system control module.

5. The intelligent distribution box according to claim 4, characterized in that: The differential mode filter circuit includes a plurality of differential mode filter capacitors connected in parallel, one end of the plurality of differential mode filter capacitors connected in parallel is connected to the power input end of the system control module, and the other end is connected to the system ground.

6. The intelligent distribution box according to claim 5, characterized in that: An anti-reverse connection circuit is further provided between the first common-mode inductor and the differential-mode filter circuit. The anti-reverse connection circuit includes a first MOS transistor, a voltage-stabilizing diode, a third resistor, and a fourth resistor. The drain of the first MOS transistor is connected to the second output end, the gate of the first MOS transistor is connected to the system ground through the fourth resistor, and is connected to the input end of the differential-mode filter circuit through the third resistor. The voltage-stabilizing diode is connected between the gate of the first MOS transistor and the system ground, and the source of the first MOS transistor is connected to the system ground.

7. The intelligent distribution box according to claim 1, characterized in that: The output port EMC protection circuit includes a second resistor and a second diode pair connected in series between the positive and negative poles of the vehicle-end power supply module, and the second diode pair includes a Schottky diode and a low-impedance current-limiting diode connected in series.

8. The intelligent distribution box according to claim 1, characterized in that: The CAN communication EMC protection circuit includes a second common-mode inductor, the first input end and the first output end of the second common-mode inductor are respectively connected to the CAN high-speed line between the vehicle-end controller and the CAN communication unit, and the second input end and the second output end of the second common-mode inductor are respectively connected to the CAN low-speed line between the vehicle-end controller and the CAN communication unit.

9. The intelligent distribution box according to claim 8, characterized in that: The CAN communication EMC protection circuit also includes an ESD diode pair and a differential mode filter capacitor arranged between the second common mode inductor and the vehicle-end controller. The ESD diode pair is arranged between the CAN high-speed line and the power ground and between the CAN low-speed line and the power ground; the differential mode filter capacitor is arranged between the CAN high-speed line and the power ground and between the CAN low-speed line and the power ground.

10. A vehicle, characterized in that: It comprises the intelligent distribution box according to any one of claims 1 to 9.

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