Wireless charging system and method based on electromagnet matrix

Abstract

The invention relates to a wireless charging system and method based on an electromagnet matrix, the system comprises a transmitting module and a receiving module, each of the transmitting module and the receiving module comprises a coil, an electromagnet matrix, a position sensor and a control module, the electromagnet matrix is installed on the back of the coil, the electromagnet matrix and the position sensor are both connected with the control module, and the control module is connected with the coil. The electromagnet matrix comprises electromagnet units arranged in an array; the position sensor is used for detecting relative position data between the transmitting module and the receiving module, and the control module is used for introducing control current to each electromagnet unit of the electromagnet matrix according to the relative position data and preset electromagnet control logic. According to the invention, the electromagnet matrix is arranged on the back surface of the coil, and the magnetic flux of each electromagnet unit is adjusted by controlling the current flowing through each electromagnet unit in the electromagnet matrix, so that the magnetic field deviates towards the direction of the transmitting module, and the alignment flexibility during actual use by a user is improved.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a wireless charging system and method based on an electromagnet matrix. Background Art

[0002] At present, the wireless charging solutions on the market basically place fixed magnetic materials behind the coil, and transmit electrical energy from one end (transmitting module) to the other end (receiving module) through the principle of electromagnetism and magnetism.

[0003] In current wireless charging applications, because the position and magnetic induction of magnetic materials are fixed, improper alignment of the receiving and transmitting coils reduces the area where the magnetic fields overlap and resonate, reducing wireless charging transmission efficiency and wasting energy. More seriously, significant heat is generated in the coils and surrounding metal surfaces, posing a safety hazard. This is the key issue currently preventing wireless charging technology from being widely adopted in real-world production and life. Summary of the Invention

[0004] The present invention is a wireless charging system and method based on an electromagnet matrix, which can improve the flexibility of wireless charging products in alignment to a certain extent by actively adjusting the alignment of the magnetic field within a certain range, thereby solving the technical problems existing in the background technology.

[0005] A technical solution of the present invention is as follows: A wireless charging system based on an electromagnet matrix, comprising: a transmitting module and a receiving module, characterized in that the transmitting module and the receiving module both comprise: a coil, an electromagnet matrix, a position sensor, and a control module, the electromagnet matrix being mounted on the back of the coil, the electromagnet matrix and the position sensor being connected to the control module, and the electromagnet matrix comprising electromagnet units arranged in an array; The position sensor is used to detect the relative position data between the transmitting module and the receiving module. The control module is used to pass a control current into each electromagnet unit of the electromagnet matrix based on the relative position data and the preset electromagnet control logic, so that the charging magnetic field is offset toward the receiving module. The electromagnet control logic is a mapping relationship between the relative position data and the control current.

[0006] Furthermore, the transmitting module and the receiving module determine the adjusted charging transmission efficiency, and when the charging transmission efficiency is greater than a preset threshold, wireless charging is started.

[0007] Furthermore, during the wireless charging process, the transmitting module and the receiving module adjust the control current of each electromagnet unit of the electromagnet matrix in real time through the relative position data and the electromagnet control logic.

[0008] Furthermore, after charging is completed, the transmitting module determines whether the user has occupied the charging pile for a long time based on the relative position data.

[0009] Another technical solution of the present invention is as follows: a wireless charging method based on an electromagnet matrix, applied to any of the above-mentioned wireless charging systems based on an electromagnet matrix, comprising: S10: simulating the magnetic field of the electromagnet matrices of the transmitting module and the receiving module according to preset offset parameters to determine the electromagnet control logic, wherein the offset parameters include the transmission distance and displacement between the transmitting module and the receiving module; S20: Inputting the electromagnet control logic into the control modules of the transmitting module and the receiving module; S30: The control modules of the transmitting module and the receiving module receive relative position data from their respective position sensors, and determine the current of each electromagnet unit of their respective electromagnet matrices according to the relative position data and electromagnet control logic; S40: The control modules of the transmitting module and the receiving module supply current to each electromagnet unit of the respective electromagnet matrix.

[0010] Furthermore, the S10 includes: inputting the offset parameter required by the user into the wireless charging simulation software, and the wireless charging simulation software outputs a mapping relationship between relative position data and control current.

[0011] Furthermore, the S10 includes: The transmission distance was set in the wireless charging simulation software, and simulations were performed from the maximum negative displacement to the maximum positive displacement. The magnetic flux data of each electromagnet in the electromagnet matrix of the transmitting module and the receiving module were obtained at different displacements. Simulate the maximum negative transmission distance to the maximum positive transmission distance respectively, and obtain the magnetic flux data of each electromagnet in the electromagnet matrix of the transmitting module and the receiving module under different transmission distances and different displacements; According to the basic parameters of the electromagnet unit, the magnetic flux data is converted into a control current through wireless charging simulation software, thereby obtaining the control current of each electromagnet in the electromagnet matrix of the transmitting module and the receiving module under different transmission distances and different displacements, that is, the mapping relationship between the relative position data and the control current.

[0012] Beneficial effects of the present invention: The present invention sets an electromagnet matrix on the back of the transmitting coil and the receiving coil, controls the current flowing through each electromagnet unit in the electromagnet matrix, and adjusts the magnetic flux of each electromagnet unit, so that the magnetic field is offset in the direction of the transmitting module. To a certain extent, it solves the problem that the existing wireless charging technology must be precisely aligned, can improve the alignment flexibility of users in actual use, improve the wireless charging efficiency, and improve the charging success rate of wireless charging in automated unmanned operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the module structure in the wireless charging system based on the electromagnet matrix of the present invention.

[0014] Figure 2 It is a structural block diagram of the wireless charging system based on the electromagnet matrix of the present invention.

[0015] Figure 3 It is a flow chart of a wireless charging method based on an electromagnet matrix of the present invention. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0017] In one technical solution of the present invention, Figure 1 and Figure 2 It is a structural diagram provided according to the specific structure of a wireless charging system based on an electromagnet matrix, such as Figure 1 and Figure 2 As shown, the present invention specifically includes: a transmitting module and a receiving module, wherein the transmitting module and the receiving module both include: a coil 1, an electromagnet matrix 2, a position sensor 3 and a control module 4, the electromagnet matrix 2 is installed on the back of the coil 1, the coil 1, the electromagnet matrix 2, and the position sensor 3 are all connected to the control module 4, and the electromagnet matrix 2 includes electromagnet units arranged in an array.

[0018] The position sensor 3 is used to detect the relative position data between the transmitting module and the receiving module. The control module 4 is used to pass a control current into each electromagnet unit of the electromagnet matrix 2 based on the relative position data and the preset electromagnet control logic, so as to shift the charging magnetic field toward the receiving module. Specifically, the direction of the charging magnetic field is consistent with the relative direction of the transmitting module and the receiving module. The electromagnet control logic is a mapping relationship between the relative position data and the control current.

[0019] Among them, a number of electromagnets with regular shapes, which can be square or circular, are used to form an electromagnet matrix 2, and the size of the matrix is ​​determined according to the offset required by the customer.

[0020] Among them, the control module 4 can be implemented by a chip module with logic processing capabilities such as an MCU and a single-chip microcomputer. Its function is to determine the current that needs to pass through each electromagnet unit in the electromagnet matrix 2 based on the relative position data of the transmitting module and the receiving module, and then control the current flowing through the electromagnet unit according to the current parameters. To this end, if necessary, the control module 4 may include an electromagnet control circuit, which is connected to each electromagnet unit in the electromagnet matrix 2 and is used to adjust the current flowing through each electromagnet unit in the electromagnet. The electromagnet control circuit is a conventional technical means in this field, so it will not be repeated here.

[0021] When the receiving module and the transmitting module enter the effective transmission distance range, the receiving module and the transmitting module use the position parameters detected by their respective position sensors 3 to determine the relative position of the final receiving module coil 1 and the transmitting module coil 1. It should be noted that the position sensor 3 can adopt a three-dimensional Hall sensor, which will transmit three-dimensional spatial position parameters. During specific installation, three-dimensional Hall sensors can be installed at the four corners of the coil 1. The four three-dimensional Hall sensors on the four corners of the coil 1 form the three-dimensional data of the spatial dimensions of the coil 1. The three-dimensional spatial dimension data of the two coils 1 are combined to determine the relative position and center offset of the two coils 1. Among them, the specific calculation method is a conventional technical means in this field, so it will not be repeated here.

[0022] The transmitting module and the receiving module determine the adjusted charging transmission efficiency, and when the charging transmission efficiency is greater than a preset threshold, wireless charging is started.

[0023] Specifically, the mapping relationship between relative position data and charging transmission efficiency is input into the control module 4 of the receiving module and the transmitting module. The control module 4 queries the corresponding charging transmission efficiency based on the relative position data. It should be noted that the charging transmission efficiency in the input data. The specific charging transmission efficiency can be simulated using wireless charging simulation software. When the control current of each electromagnet unit in the electromagnet matrix 2 is adjusted, if the charging transmission efficiency is still less than the preset threshold, wireless charging is stopped. If the control module 4 determines that the adjusted charging transmission efficiency still cannot reach the efficiency threshold, a warning of charging failure is issued.

[0024] During the wireless charging process, the transmitting module and the receiving module adjust the control current of each electromagnet unit of the electromagnet matrix 2 in real time through the relative position data and the electromagnet control logic. During the charging process, the relative position of the coils 1 on both sides is determined at regular intervals to synchronously adjust the current of the electromagnet matrix 2 to maintain the highest efficiency. If the relative position change exceeds the relative position data corresponding to the preset efficiency threshold, the charging is stopped and a warning is issued. After charging is complete, the transmitter module determines whether the user has occupied the charging station for a long time based on the relative position data. After charging is complete, the relative position determination can be used to understand the user's occupancy status. If the user has occupied the charging station for a long time, a warning will be issued and other work processes will be initiated, such as reminding the user to move the car, charging a occupancy fee, etc.

[0025] In another technical solution of the present invention, Figure 3 A flowchart is provided according to a wireless charging method based on an electromagnetic matrix, a wireless charging method based on an electromagnetic matrix is ​​applied to any of the above-mentioned wireless charging systems based on an electromagnetic matrix, such as Figure 3 As shown, specifically including: S10: Simulating the magnetic field of the electromagnet matrix 2 of the transmitting module and the receiving module according to preset offset parameters to determine the electromagnet control logic, wherein the offset parameters include the transmission distance and displacement between the transmitting module and the receiving module.

[0026] By inputting the offset parameters required by the user into the wireless charging simulation software, the wireless charging simulation software outputs a mapping relationship between relative position data and control current.

[0027] Set the transmission distance in the wireless charging simulation software and perform simulations from the maximum negative displacement to the maximum positive displacement to obtain the magnetic flux data of each electromagnet in the electromagnet matrix 2 of the transmitting module and the receiving module under different displacements. Simulate the maximum negative transmission distance to the maximum positive transmission distance respectively, and obtain the magnetic flux data of each electromagnet in the electromagnet matrix 2 of the transmitting module and the receiving module under different transmission distances and different displacements; According to the basic parameters of the electromagnet unit, the magnetic flux data is converted into a control current through wireless charging simulation software, thereby obtaining the control current of each electromagnet in the electromagnet matrix 2 of the transmitting module and the receiving module under different transmission distances and different displacements, that is, the mapping relationship between the relative position data and the control current.

[0028] S20: Inputting the electromagnet control logic into the control module 4 of the transmitting module and the receiving module.

[0029] S30: The control modules 4 of the transmitting module and the receiving module receive the relative position data of the respective position sensors 3, and determine the current of each electromagnet unit of the respective electromagnet matrix 2 according to the relative position data and the electromagnet control logic.

[0030] S40 : The control modules 4 of the transmitting module and the receiving module supply current to each electromagnet unit of the respective electromagnet matrix 2 .

[0031] The following is a specific example: the customer's required offset parameters are a wireless charging transmission distance of 6-8cm (i.e. 7cm±1cm), a position offset of ±5cm front, back, left and right, and an overall transmission efficiency of no less than 80%, which is the preset threshold.

[0032] So, the first step: data simulation: In the simulation software, the magnetic flux data of all individual electromagnet units in the plane area where the center points of the transmitting module and the receiving module are offset from (x-5cm, y-5cm) to (x+5cm, y+5cm) when the transmission distance between the transmitting module and the receiving module is 7cm are first simulated.

[0033] Then, the transmission distance between the transmitting module and the receiving module is set to (z-1cm) to (z+1cm) to get the magnetic flux data of all single electromagnets; Thus, the magnetic flux data of each electromagnet in the electromagnet matrix 2 of the transmitting module and the receiving module under different transmission distances and different displacements are obtained.

[0034] Based on the magnetic flux data and the rated parameters of the electromagnets, wireless charging simulation software calculates the required power per unit time. Dividing this power by the electromagnet's rated voltage yields the control current required to restore the magnetic flux. This yields the control current for each electromagnet in the electromagnet matrix 2 of the transmitting and receiving modules at different transmission distances and displacements, representing the mapping between relative position data and control current.

[0035] The second step is to determine the relative position: The mapping relationship between the relative position data and the control current obtained from the first step of the simulation is recorded into the control circuit modules of the transmitting module and the receiving module; The transmitting module and the receiving module each have a three-dimensional Hall sensor at the four corners to determine the relative position of the transmitting module and the receiving module; By combining the values ​​returned by the eight three-dimensional Hall sensors, the relative position data of the transmitting module and the receiving module in space can be generated.

[0036] The third step is to restore the magnetic field: According to the relative position data of the transmitting module and the receiving module, a corresponding data matrix is ​​found in the mapping relationship between the relative position data and the control current; The transmitting module and the receiving module each provide the required control current to each electromagnet through the control module 4, so that the magnetic flux of each electromagnet is the same as the magnetic flux of each electromagnet in the simulation software, thereby forming a magnetic field consistent with the relative position direction, that is, a magnetic field offset toward the coil 1 of the receiving module.

[0037] It should be noted that the wireless charging transmission efficiency can also be calculated in the simulation software, and an efficiency range of no less than 80% of the customer's requirement can be selected to generate the data curve.

[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A wireless charging system based on an electromagnet matrix, comprising: A transmitting module and a receiving module, characterized in that the transmitting module and the receiving module both comprise: a coil (1), an electromagnet matrix (2), a position sensor (3) and a control module (4), wherein the electromagnet matrix (2) is mounted on the back of the coil (1), the electromagnet matrix (2) and the position sensor (3) are both connected to the control module (4), and the electromagnet matrix (2) comprises electromagnet units arranged in an array; The position sensor (3) is used to detect the relative position data between the transmitting module and the receiving module, and the control module (4) is used to pass a control current into each electromagnet unit of the electromagnet matrix (2) according to the relative position data and a preset electromagnet control logic, so as to cause the charging magnetic field to shift in the direction of the receiving module, and the electromagnet control logic is a mapping relationship between the relative position data and the control current.

2. The wireless charging system based on the electromagnet matrix according to claim 1, characterized in that: The transmitting module and the receiving module determine the adjusted charging transmission efficiency, and when the charging transmission efficiency is greater than a preset threshold, wireless charging is started.

3. The wireless charging system based on the electromagnet matrix according to claim 2, characterized in that: During the wireless charging process, the transmitting module and the receiving module adjust the control current of each electromagnet unit of the electromagnet matrix (2) in real time through relative position data and electromagnet control logic.

4. The wireless charging system based on the electromagnet matrix according to claim 3, characterized in that: After charging is completed, the transmitting module determines whether the user has occupied the charging pile for a long time based on the relative position data.

5. A wireless charging method based on an electromagnet matrix, characterized in that: The wireless charging system based on the electromagnet matrix as claimed in any one of claims 1 to 4 comprises: S10: simulating the magnetic field of the electromagnet matrix (2) of the transmitting module and the receiving module according to preset offset parameters to determine the electromagnet control logic, wherein the offset parameters include the transmission distance and displacement between the transmitting module and the receiving module; S20: Inputting the electromagnet control logic into the control module (4) of the transmitting module and the receiving module; S30: The control modules (4) of the transmitting module and the receiving module receive the relative position data of the respective position sensors (3), and determine the current of each electromagnet unit of the respective electromagnet matrix (2) according to the relative position data and the electromagnet control logic; S40: The control modules (4) of the transmitting module and the receiving module supply current to each electromagnet unit of the respective electromagnet matrix (2).

6. The wireless charging method based on the electromagnet matrix according to claim 5, characterized in that: The step S10 includes inputting the required offset parameter into wireless charging simulation software, and the wireless charging simulation software outputting a mapping relationship between relative position data and control current.

7. The wireless charging method based on the electromagnet matrix according to claim 6, characterized in that: The S10 includes: The transmission distance is set in the wireless charging simulation software, and simulation is performed from the maximum negative displacement to the maximum positive displacement, and the magnetic flux data of each electromagnet in the electromagnet matrix (2) of the transmitting module and the receiving module under different displacements are obtained; Simulate the maximum negative transmission distance to the maximum positive transmission distance respectively, and obtain the magnetic flux data of each electromagnet in the electromagnet matrix (2) of the transmitting module and the receiving module under different transmission distances and different displacements; According to the basic parameters of the electromagnet unit, the magnetic flux data is converted into a control current through wireless charging simulation software, thereby obtaining the control current of each electromagnet in the electromagnet matrix (2) of the transmitting module and the receiving module under different transmission distances and different displacements, that is, the mapping relationship between the relative position data and the control current.

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