Circuit board device for automobile steering system

Abstract

The invention relates to a circuit board arrangement for a steering system of a motor vehicle, comprising: a first circuit board (201); the second circuit board (202) is electrically connected with the first circuit board (201) through the first connecting part (211); the third circuit board (203) is electrically connected with the second circuit board (202) through a second connecting part (212); the fourth circuit board (204) is electrically connected with the third circuit board (203) through a third connecting part (213); the fifth circuit board (205) is electrically connected with the fourth circuit board (204) through a fourth connecting part (214), the first connecting part (211) enables the first circuit board (201) and the second circuit board (202) to form a first angle, the second connecting part (212) enables the second circuit board (202) and the third circuit board (203) to form a second angle, and the third connecting part (213) enables the third circuit board (203) and the fourth circuit board (204) to form a third angle; the fourth connection portion (214) enables the fourth circuit board (204) and the fifth circuit board (205) to form a fourth angle.

Description

Technical Field

[0001] The invention relates to the field of automobiles, in particular to a circuit board device for an automobile steering system. Background Art

[0002] The automotive electronics industry is an important high-tech field. In the context of the rapid development of digitalization, intelligence and networking, higher and higher requirements are being placed on it. As consumers' demands for driving comfort and safety continue to increase, the application scope of automotive steering systems is also expanding. On the one hand, it requires the diversity of driving functions, and on the other hand, the requirements for driving safety are becoming more stringent.

[0003] As the new energy electric vehicle market becomes more and more active, the integration and miniaturization of automobile steering systems have begun to enter the field of vision of engineers. By integrating the drive motor and the controller, it can achieve lightweight, high efficiency, miniaturization, and reduce costs. This can free up space and facilitate vehicle layout to a certain extent. The integrated design of the automobile steering system can not only achieve the miniaturization and lightweight of the automobile steering system to reduce costs, but also improve efficiency: for example, the drive motor is integrated with the PCB (printed circuit board) controller, and the motor and the PCB controller are directly connected through PIN (pin), and no longer need to be connected with a wiring harness. As a result, not only the size and weight of the mechanism are reduced, but also the energy loss generated by the wiring harness is reduced. However, in the current mainstream solutions, the space utilization rate is not high enough or the process is complicated, which makes it impossible to achieve a truly miniaturized design. Summary of the invention

[0004] The present invention has been made to solve the above problems.

[0005] One embodiment of the present invention provides a circuit board device for an automobile steering system, comprising: a first circuit board; a second circuit board, electrically connected to the first circuit board through a first connection portion; a third circuit board, electrically connected to the second circuit board through a second connection portion; a fourth circuit board, electrically connected to the third circuit board through a third connection portion; and a fifth circuit board, electrically connected to the fourth circuit board through a fourth connection portion, wherein the first connection portion enables the first circuit board to form a first angle with the second circuit board, the second connection portion enables the second circuit board to form a second angle with the third circuit board, the third connection portion enables the third circuit board to form a third angle with the fourth circuit board, and the fourth connection portion enables the fourth circuit board to form a fourth angle with the fifth circuit board, and the first angle, the second angle, the third angle and the fourth angle are all greater than or equal to 0° and less than or equal to 180°.

[0006] In one embodiment, the first circuit board, the second circuit board, the third circuit board, the fourth circuit board and the fifth circuit board are all rectangular, and each has a first side, a second side, a third side and a fourth side.

[0007] In one embodiment, the first connecting portion connects the first side of the first circuit board and the first side of the second circuit board, the second connecting portion connects the second side of the second circuit board and the second side of the third circuit board, the third connecting portion connects the fourth side of the third circuit board and the second side of the fourth circuit board, and the fourth connecting portion connects the first side of the fourth circuit board and the first side of the fifth circuit board.

[0008] In one embodiment, the first side and the third side of the first circuit board, the second circuit board, the third circuit board, the fourth circuit board and the fifth circuit board are long sides, and the second side and the fourth side are short sides.

[0009] In one embodiment, the first angle, the second angle, the third angle and the fourth angle are 90°.

[0010] In one embodiment, the first circuit board and the fifth circuit board are respectively provided with a common mode inductor and an electrolytic capacitor, and when the circuit board device is in a folded state, the common mode inductor and the electrolytic capacitor on the first circuit board and the fifth circuit board are located inside the cuboid formed by the circuit board device.

[0011] In one embodiment, the first circuit board and the fifth circuit board each include a power management module, a sampling module and a power bridge module, the second circuit board and the fourth circuit board each include a logic control module, a pre-driver module and a first communication module, and the third circuit board includes a sensor module and a second communication module.

[0012] In one embodiment, the first circuit board and the fifth circuit board are redundant with each other, and the second circuit board and the fourth circuit board are redundant with each other.

[0013] In one embodiment, the circuit board arrangement further comprises a first connector for connecting to the motor, the pins of the first connector being configured to be compatible with the motor.

[0014] In one embodiment, the first connection portion, the second connection portion, the third connection portion and the fourth connection portion are flexible circuit boards.

[0015] The circuit board device for the automobile steering system of the present invention optimizes the circuit board design. By disassembling the circuit board of the control unit into multiple pieces and connecting the circuit boards through foldable connecting parts, the circuit board device can be combined into any required shape, thereby realizing the miniaturization of the circuit board device and the automobile steering system. Not only does it solve the problem that the existing solution cannot be assembled due to the large size, but it also has a simple process, saves a large number of in-board connectors, greatly improves the stability of the product under vibration conditions, makes the structure more flexible, and the system modules are clearly distributed, reduces mutual interference between modules, and greatly improves the EMC (electromagnetic compatibility) performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of an integrated solution of an automobile steering system in the prior art.

[0018] Figure 2 It is a schematic diagram of another integrated solution of the automobile steering system in the prior art.

[0019] Figure 3 is a structural diagram of a vehicle steering system according to an embodiment of the present invention.

[0020] Figure 4 is a perspective view of a circuit board device for an automobile steering system in a folded state according to an embodiment of the present invention.

[0021] Figure 5 The present invention is a perspective view of a circuit board device for a vehicle steering system in a flat state according to an embodiment of the present invention.

[0022] Figure 6 2 is a three-dimensional view from another angle of a flattened state of a circuit board device for an automobile steering system according to an embodiment of the present invention.

[0023] Figure 7 FIG. 4 is a plan view of a circuit board device for an automobile steering system in a flat state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The specific implementation of the present application is described below with reference to the accompanying drawings. In each of the drawings, the same or similar reference numerals are used to represent the same or similar components, and their repeated description is omitted for simplicity.

[0025] The automobile steering system is used to enable the automobile to control the direction of the automobile according to the driver's wishes. Automobile steering systems usually include mechanical steering systems and electronic power steering systems. Mechanical steering systems only use the driver's physical strength as the steering power source, while electronic power steering systems use both the driver's physical strength and engine power as the steering power source. Electronic power steering systems are usually formed by adding a power steering device to the mechanical steering system. Compared with mechanical steering systems, electronic power steering systems are more labor-saving to operate and are therefore more widely used. In the following text, unless otherwise specified, the automobile steering system mentioned refers to the electronic power steering system.

[0026] There are currently two main technical solutions for the integration of automotive steering systems: one is to use a single PCB to implement all system functions. This solution has simple processes, low costs, and is easy to implement; the other is to implement the components of the electronic power steering system on multiple circular PCBs, stacking the multiple circular PCBs and connecting them with connectors in the middle. This solution greatly reduces the size of the product and has a high degree of PCB integration.

[0027] Figure 1 Schematic diagram of an integrated solution of the automotive steering system of the prior art. Figure 1 In the solution shown, the control part of the automobile steering system is implemented with a PCB, that is, all components of the control part of the automobile steering system are integrated on a PCB. This solution is simple to design and implement, and the cost of production, assembly and subsequent maintenance is relatively low. It is suitable for use in vehicles with low space requirements. However, due to the higher requirements for integration and integration of current intelligent products, it is increasingly difficult for this solution to meet the current demand for miniaturization, intelligence and multi-functionality of products.

[0028] Figure 2 Schematic diagram of another integrated solution of the automotive steering system in the prior art. Figure 2 In the solution shown, the components of the control part of the automobile steering system are arranged on a plurality of circular circuit boards, and the boards are connected to each other through connectors or pin headers. Figure 1 Compared with the scheme, Figure 2 The solution has been effectively optimized in terms of space, but there are still many problems in other aspects. Figure 2 In the solution, since there are connectors on both the top and bottom layers, this solution is very difficult to assemble in fully automated production. For example, many large electronic components, such as common mode inductors and electrolytic capacitors, are used in the steering system of an automobile. Figure 2 The required longitudinal space distance of the solution is constantly lengthened, which leads to the lengthening of the connector or pin header, which is easy to bend or deform during the production process, which may cause signal transmission errors and even cause the circuit board to burn out in severe cases.

[0029] In addition, for Figure 2 The solution is too complex to assemble and has very strict requirements on production, which will greatly increase the difficulty of product assembly and manufacturing costs, making it difficult to apply it to mass-produced products on a large scale. At the same time, since the motor terminals are fixed on the round circuit board, this solution can only be adapted to a certain size of round motor, which also makes it difficult to apply it to mass-produced products on a large scale.

[0030] The present invention proposes a circuit board device for an automobile steering system, which adopts a multi-PCB bending solution, reduces the product size, improves the system EMC performance, and improves the product versatility. Those skilled in the art understand that the automobile steering system (electronic power steering system) includes two parts: a drive motor and a control unit. The control unit is implemented on a circuit board such as a PCB, and can be connected to the drive motor through a PIN (pin) or the like.

[0031] The automobile steering system (electronic power steering system) is generally composed of a power management module, a logic control module, a pre-drive module, a sampling module, a power bridge module, a sensor module, and a communication module. In one embodiment, in order to meet the requirements of high stability, the automobile steering system adopts a dual-channel redundant design. Figure 3 FIG. 1 is a schematic diagram of a vehicle steering system according to an embodiment of the present invention. Figure 3 As shown, the automobile steering system 100 includes a subsystem 1 and a subsystem 2, which are redundant and can work alternately to form a dual channel. In one embodiment, the automobile steering system 100 also includes an inter-subsystem communication module 101, which is used to transmit information between subsystem 1 and subsystem 2, so that subsystem 1 and subsystem 2 can work normally, such as realizing time-sharing work. In one embodiment, the settings of subsystem 1 and subsystem 2 can be exactly the same, only the working timing is different. In another embodiment, subsystem 1 and subsystem 2 can have a small difference according to specific needs. Since the settings of subsystem 1 and subsystem 2 are basically the same, subsystem 1 is mainly described in detail below, and the detailed description of subsystem 2 is omitted. Those skilled in the art understand that the description of subsystem 1 is also applicable to subsystem 2.

[0032] Subsystem 1 includes a power management module 111, a logic control module 112, a pre-driver module 113, a sampling module 114, a power bridge module 115, a sensor module 116, a communication module 117, and a motor 118. Subsystem 2 includes a power management module 121, a logic control module 122, a pre-driver module 123, a sampling module 124, a power bridge module 125, a sensor module 126, a communication module 127, and a motor 128. In one embodiment, motor 118 and motor 128 may be the same motor, sampling module 114, power bridge module 115, sampling module 124, and power bridge module 125 are all connected to the motor, and when subsystem 1 is working, other modules of subsystem 1 work in coordination with the motor, and when subsystem 2 is working, other modules of subsystem 2 work in coordination with the motor.

[0033] The power management module 111 is used to receive power from the vehicle power supply and provide the required voltage to other modules of the subsystem 1. Figure 31 shows that the power management module 111 is connected to the logic control module 112, but those skilled in the art understand that the power management module 111 can power other modules in the subsystem 1 and can provide different voltages as needed. The communication module 117 is used to receive signals from the vehicle and process them for output to the logic control module 112. The sensor module 116 is used to sense vehicle information, such as steering angle, steering force, etc. The logic control module 112 performs logic control of the subsystem 1 (or the automotive steering system 100) based on the inputs of the power management module 111, the sensor module 116, the communication module 117 and the sampling module 114. Specifically, the logic control module 112 outputs a control signal to the pre-drive module 113, and the pre-drive module 113 is connected to the power bridge module 115, thereby driving the motor 118 to work. The sampling module 114 samples the working condition of the motor 118 and outputs the sampled signal to the logic control module 112 to provide more accurate control of the motor 118.

[0034] In short, after receiving the vehicle power supply through the power management module 111, the vehicle steering system 100 receives vehicle signals, such as vehicle speed, torque, etc., through the sensor module 116 and the communication module 117, performs logic control through the logic control module 112, and coordinates through multiple modules (pre-drive module 113, power bridge module 115, etc.) to drive the motor 118 to work. In one embodiment, the logic control module 112 is implemented as a micro control unit (MCU).

[0035] Figure 4 FIG. 2 is a perspective view of a circuit board device 200 for a vehicle steering system according to an embodiment of the present invention in a folded state. The vehicle steering system in which the circuit board device 200 is used is, for example, Figure 3 The automobile steering system 100 shown adopts a dual-channel redundant design and works through two groups of power-assisting subsystems. The working method is more complicated than the previous single-channel design, which is reflected in the circuit board design as the number of all components doubled. In order to meet the needs of miniaturization, this solution consists of 5 circuit boards, which are connected by bendable connecting parts (such as flexible circuit boards) and can be folded into a cuboid. The cuboid in this article includes a cube, that is, a cube is a special cuboid with square faces. The bending of the connecting part can exceed 180° and is not easy to damage. Since there are multiple large components in this solution, such as electrolytic capacitors, common-mode inductors, etc., all large components can be folded inside the cuboid, which can greatly reduce the space required for the product and is easier to integrate in a cylindrical motor. Compared with the prior art solution, it can be applied to motors of various sizes.

[0036] Combine the following Figures 5 to 7The specific configuration of the circuit board device 200 will be described. Figure 5 FIG. 2 is a perspective view of a circuit board device 200 for a vehicle steering system in a flat state according to an embodiment of the present invention. Figure 6 FIG. 2 is a perspective view of a circuit board device 200 for a vehicle steering system in a flat state according to an embodiment of the present invention from another angle. Figure 7 FIG. 2 is a plan view of a circuit board device 200 for a vehicle steering system according to an embodiment of the present invention in a flat state.

[0037] As shown in the figure, the circuit board device 200 includes a first circuit board 201, a second circuit board 202, a third circuit board 203, a fourth circuit board 204 and a fifth circuit board 205, wherein the second circuit board 202 is electrically connected to the first circuit board 201 through a first connection portion 211, the third circuit board 203 is electrically connected to the second circuit board 202 through a second connection portion 212, the fourth circuit board 204 is electrically connected to the third circuit board 203 through a third connection portion 213, and the fifth circuit board 205 is electrically connected to the fourth circuit board 204 through a fourth connection portion 214. The first connection portion 211 allows the first circuit board 201 and the second circuit board 202 to form a first angle, the second connection portion 212 allows the second circuit board 202 and the third circuit board 203 to form a second angle, the third connection portion 213 allows the third circuit board 203 and the fourth circuit board 204 to form a third angle, and the fourth connection portion 214 allows the fourth circuit board 204 and the fifth circuit board 205 to form a fourth angle, wherein the first angle, the second angle, the third angle and the fourth angle are all greater than or equal to 0° and less than or equal to 180°.

[0038] The first circuit board 201, the second circuit board 202, the third circuit board 203, the fourth circuit board 204 and the fifth circuit board 205 may be PCBs. In one embodiment, the first circuit board 201, the second circuit board 202, the third circuit board 203, the fourth circuit board 204 and the fifth circuit board 205 are all rectangular, and each has a first side, a second side, a third side and a fourth side. The first connecting portion 211 connects the first side of the first circuit board 201 with the first side of the second circuit board 202, the second connecting portion 212 connects the second side of the second circuit board 202 with the second side of the third circuit board 203, the third connecting portion 213 connects the fourth side of the third circuit board 203 with the second side of the fourth circuit board 204, and the fourth connecting portion 214 connects the first side of the fourth circuit board 204 with the first side of the fifth circuit board 205.

[0039] In one embodiment, the first side and the third side of each circuit board are long sides, and the second side and the fourth side are short sides, that is, the length of the first side and the third side is greater than the length of the second side and the fourth side. In one embodiment, at least one of the first circuit board 201, the second circuit board 202, the third circuit board 203, the fourth circuit board 204 and the fifth circuit board 205 is a square. For example, the third circuit board 203 can be a square, that is, the lengths of the four sides of the third circuit board 203 are equal. In other embodiments, other circuit boards can also be squares. The "rectangle" mentioned in this article includes a square, which is a special rectangle with four sides of equal length. In addition, the fact that each circuit board is a rectangle mentioned in this article means that its overall shape is basically a rectangle, and some areas may be concave, grooved or have some misalignment of the side lines. The four corners of the circuit board can be right angles or rounded corners with a certain curvature, etc., and these situations are all included in the scope of the present invention.

[0040] The first connection portion 211 , the second connection portion 212 , the third connection portion 213 and the fourth connection portion 214 are used to enable each circuit board of the circuit board device 200 to be in a position such as Figure 4 The folded state shown. In one embodiment, the first connection part 211, the second connection part 212, the third connection part 213 and the fourth connection part 214 can be a flexible circuit board (FPC), and its bending angle can exceed 180°, that is, the flexible circuit boards can be rolled together without restriction. In one embodiment, in order to increase the connection strength between adjacent circuit boards, a reinforcing mechanism that enables adjacent circuit boards to form a folding angle can be arranged above, below and / or on the side of each connection part. The reinforcing mechanism can be a reinforcing member formed of a bendable material with a hardness greater than that of the flexible circuit board, or a positioning member that can be fixed at one or more specific angles. The arrangement of each connection part and the corresponding reinforcing mechanism can take various forms: separate and separate arrangements, separate but bonded arrangements, integrated arrangements, and the like.

[0041] In one embodiment, when the circuit board device 200 is in the folded state, the angles formed by the adjacent circuit boards may be 90°, that is, the first angle, the second angle, the third angle and the fourth angle are 90°. At this time, the five circuit boards of the circuit board device 200 form five faces of a rectangular parallelepiped, such as Figure 4 In other embodiments, the circuit board device 200 can be folded into other shapes. In addition to reducing the size of the circuit board device 200 by folding, components with larger volumes can be arranged to be located inside the folding space when the circuit board device 200 is in the folded state, for example Figure 4In one embodiment, the first circuit board 201 and the fifth circuit board 205 are each provided with a common-mode inductor and an electrolytic capacitor, and when the circuit board device 200 is in a folded state, the common-mode inductor and the electrolytic capacitor on the first circuit board 201 and the fifth circuit board 205 are located inside the cuboid formed by the circuit board device 200.

[0042] The module configuration of each circuit board is described below. In one embodiment, the first circuit board 201 includes a power management module, a sampling module and a power bridge module, for example Figure 3 The power management module 111, sampling module 114 and power bridge module 115 in the subsystem 1 are shown. These modules have large currents and are the largest signal interference sources in the circuit board device. Placing these high-current modules in the same circuit board can effectively prevent the mutual influence between the interference source and the transmission signal, and improve the EMC performance of the product. In one embodiment, the first circuit board 201 can be called a motor drive board.

[0043] In one embodiment, the second circuit board 202 includes a logic control module, a pre-driver module and a first communication module, for example Figure 3 The subsystem 1 shown includes a logic control module 112, a pre-driver module 113 and a communication module 117. These modules mainly involve digital signals and control signals transmitted to the first circuit board 201 through the first connection portion 211, so the second circuit board 202 can be called a logic control board.

[0044] In one embodiment, the third circuit board 203 includes a sensor module and a second communication module, for example Figure 3 The sensor module 116 and the inter-subsystem communication module 101 of the subsystem 1 are shown. Figure 4 When the circuit board assembly 200 is folded and fixed to the motor in the manner shown, the third circuit board 203 is opposite to the motor rotor. The area of ​​the third circuit board 203 is usually smaller than that of other circuit boards. In one embodiment, the third circuit board 203 can be called a sensor board.

[0045] In one embodiment, the fourth circuit board 204 is redundant with the second circuit board 202, that is, except for the setting direction and connection relationship, the fourth circuit board 204 is the same as the second circuit board 202, so the fourth circuit board 204 can also be called a logic control board. In one embodiment, the fourth circuit board 204 includes a logic control module, a pre-driver module and a first communication module, such as Figure 3 The subsystem 2 shown includes a logic control module 122 , a pre-driver module 123 and a communication module 127 .

[0046] In one embodiment, the fifth circuit board 205 is redundant with the first circuit board 201, that is, except for the setting direction and connection relationship, the fifth circuit board 205 is the same as the first circuit board 201. Therefore, the fifth circuit board 205 can also be referred to as a motor drive board. In one embodiment, the fifth circuit board 205 includes a power management module, a sampling module, and a power bridge module. For example Figure 3 the power management module 121, the sampling module 124, and the power bridge module 125 in the subsystem 2 shown.

[0047] The circuit board device 200 according to the present invention includes multiple circuit boards, and different functional modules are allocated on each circuit board. Among them, the high-power module and the logic control module are arranged on different circuit boards respectively, so that the large current in the high-power module is effectively limited within the motor drive board, reducing the interference to the logic control board, making the logic control signal more stable and reliable, and playing an important role in EMC.

[0048] In addition, the circuit boards are connected to each other through a flexible board or a semi-flexible board as a connection part. The design of the flexible board or the semi-flexible board has very strong flexibility. It can not only cooperate with various rigid boards for production, but also change the shape of the circuit in space. At the same time, the flexible board or the semi-flexible board can be folded, greatly reducing the occupied space of the rigid board. The required space size after the circuit board device is bent, especially the planar space size, is much smaller than that required in the single circuit board solution (such as Figure 1 the solution shown). Setting each module on different circuit boards will not affect the signal transmission and communication effect, and has a strong anti-interference ability, improving the performance of electronic products, making the signal transmission more accurate, and minimizing the mutual interference between each module. In addition, during the signal transmission process of the solution according to the present invention, compared with the single circuit board solution (such as Figure 1 the solution shown), the circuit boards are closer to each other, shortening the transmission path, reducing the error caused by the wire impedance, and having better signal quality.

[0049] In automotive steering system products, multiple connectors are often required to communicate with the entire vehicle, which can be achieved through connectors respectively connected to the vehicle and the motor. In one embodiment, the circuit board device 200 further includes a first connector for connecting to the motor, a second connector for connecting to the vehicle power supply, and a third connector for connecting to the vehicle to receive signals from the vehicle.

[0050] In one embodiment, the first connector and the second connector are provided on the first circuit board 201 and the fifth circuit board 205, and the third connector is provided on the second circuit board 202 and the fourth circuit board 204. In one embodiment, the first connector is located near the second side of the first circuit board 201 and the fifth circuit board 210, the second connector is located near the fourth side of the first circuit board 201 and the fifth circuit board 210, and the third connector is located near the fourth side of the second circuit board 202 and the fourth circuit board 204. In this embodiment, when the circuit board device 200 is in the folded state, the second connector and the third connector are located at one end (e.g., the upper end) of the circuit board device 200, and the first connector is located at the other end (e.g., the lower end) of the circuit board device 200.

[0051] This embodiment adopts a design scheme with connectors at the upper and lower ends, which is different from Figure 2 The solution shown is that the connector (first connector) at the lower end of the circuit board device 200 in this embodiment is located on the outside of the circuit board after it is bent, which can easily realize fully automated production without increasing the difficulty and cost of fully automated production.

[0052] In one embodiment, the pins of the first connector are configured to be compatible with the motor to which the circuit board device 200 is connected. In practical applications, the pins of the first connector can be set to different sizes to connect to motors of different specifications. By changing the size of the pins of the first connector, the circuit board device 200 can be adapted to motors of various specifications. This solution can be easily adapted to the requirements of various products, increasing its flexibility and versatility.

[0053] Since the present invention uses the rectangular circuit board bending technology, it effectively solves the problem of Figure 1 The problem of the product size being too large in the solution shown Figure 2 The solution shown solves the problem of overly complicated assembly process, improves the versatility of the product, and can meet the current requirements for intelligent, multifunctional and miniaturized products.

[0054] The present invention has been described above in conjunction with specific embodiments. Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

[0055] Furthermore, the terms “first,” “second,” “third,” etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0056] Reference numerals list

[0057] 100: Automobile steering system

[0058] 101: Inter-subsystem communication module

[0059] 111, 121: Power management module

[0060] 112, 122: Logic control module

[0061] 113, 123: Pre-driver module

[0062] 114, 124: Sampling module

[0063] 115, 125: Power bridge module

[0064] 116, 126: Sensor module

[0065] 117, 127: Communication module

[0066] 118, 128: Motor

[0067] 200: Circuit board device

[0068] 201: First Circuit Board

[0069] 202: Second circuit board

[0070] 203: The third circuit board

[0071] 204: Fourth circuit board

[0072] 205: Fifth Circuit Board

[0073] 211: First connection

[0074] 212: Second connection part

[0075] 213: Third connection

[0076] 214: Fourth connection

Claims

1. A circuit board device (200) for an automobile steering system, include: A first circuit board (201); A second circuit board (202) electrically connected to the first circuit board (201) via a first connecting portion (211); A third circuit board (203) electrically connected to the second circuit board (202) via a second connecting portion (212); A fourth circuit board (204) electrically connected to the third circuit board (203) via a third connecting portion (213); a fifth circuit board (205) electrically connected to the fourth circuit board (204) via a fourth connecting portion (214), The first connecting portion (211) enables the first circuit board (201) and the second circuit board (202) to form a first angle, the second connecting portion (212) enables the second circuit board (202) and the third circuit board (203) to form a second angle, the third connecting portion (213) enables the third circuit board (203) and the fourth circuit board (204) to form a third angle, and the fourth connecting portion (214) enables the fourth circuit board (204) and the fifth circuit board (205) to form a fourth angle, and the first angle, the second angle, the third angle and the fourth angle are all greater than or equal to 0° and less than or equal to 180°.

2. The circuit board arrangement (200) according to claim 1, in, The first circuit board (201), the second circuit board (202), the third circuit board (203), the fourth circuit board (204) and the fifth circuit board (205) are all rectangular, and each has a first side, a second side, a third side and a fourth side.

3. The circuit board arrangement (200) according to claim 2, in, The first connecting portion (211) connects the first side of the first circuit board (201) and the first side of the second circuit board (202); the second connecting portion (212) connects the second side of the second circuit board (202) and the second side of the third circuit board (203); the third connecting portion (213) connects the fourth side of the third circuit board (203) and the second side of the fourth circuit board (204); and the fourth connecting portion (214) connects the first side of the fourth circuit board (204) and the first side of the fifth circuit board (205).

4. The circuit board arrangement (200) according to claim 2, in, The first side and the third side of the first circuit board (201), the second circuit board (202), the third circuit board (203), the fourth circuit board (204) and the fifth circuit board (205) are long sides, and the second side and the fourth side are short sides.

5. The circuit board arrangement (200) according to claim 1, in, The first angle, the second angle, the third angle and the fourth angle are 90°.

6. The circuit board arrangement (200) according to claim 5, in, The first circuit board (201) and the fifth circuit board (205) are each provided with a common-mode inductor and an electrolytic capacitor, and when the circuit board device (200) is in a folded state, the common-mode inductor and the electrolytic capacitor on the first circuit board (201) and the fifth circuit board (205) are located inside the rectangular parallelepiped formed by the circuit board device (200).

7. The circuit board arrangement (200) according to claim 1, in, The first circuit board (201) and the fifth circuit board (205) each include a power management module, a sampling module and a power bridge module, the second circuit board (202) and the fourth circuit board (204) each include a logic control module, a pre-driver module and a first communication module, and the third circuit board (203) includes a sensor module and a second communication module.

8. The circuit board arrangement (200) according to claim 1, in, The first circuit board (201) and the fifth circuit board (205) are redundant with each other, and the second circuit board (202) and the fourth circuit board (204) are redundant with each other.

9. The circuit board arrangement (200) according to claim 1, further comprising a first connector for connecting to a motor, pins of the first connector being configured to adapt to the motor.

10. The circuit board arrangement (200) according to claim 1, in, The first connection part (211), the second connection part (212), the third connection part (213) and the fourth connection part (214) are flexible circuit boards.

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