Vehicle-mounted wireless charger and power distribution system thereof

Abstract

The invention discloses a vehicle-mounted wireless charger and a power distribution system thereof, and belongs to the technical field of vehicle-mounted electronic equipment. The vehicle-mounted wireless charger comprises a multi-degree-of-freedom support body and a charging module, the support body has the functions of horizontal rotation, pitching swing and end rotation, and the charging posture can be flexibly adjusted; the charging module is provided with an automatic clamping jaw mechanism and an arc-shaped electromagnet array arranged in a surrounding mode, and the charging module is combined with a wireless charging coil and used for supporting, clamping and aligning equipment. The power distribution system detects the attitude of the bracket in real time through an angle sensor, and adaptively adjusts the reference magnetic force of the electromagnet based on an attitude compensation formula; furthermore, the deviation of the charging coil of the equipment is detected through a high-precision position sensor, the magnetic force distribution of each electromagnet is adjusted, and the automatic alignment of the submillimeter-level coil is realized.

Description

A vehicle-mounted wireless charger and its power distribution system Technical Field

[0001] This invention relates to vehicle-mounted electronic equipment technology, and more particularly to a vehicle-mounted wireless charger and its power distribution system. Background Technology

[0002] With the popularization of wireless charging technology and the increasing demand for in-vehicle electronic devices, in-vehicle wireless chargers have become a common feature in modern vehicles. Traditional in-vehicle wireless chargers typically use a fixed or simply adjustable bracket structure, requiring users to manually place and adjust the phone's position so that the charging coil on the back of the phone is roughly aligned with the wireless charger's transmitting coil. However, manual adjustment is not only inconvenient while the vehicle is in motion, but also poses safety hazards.

[0003] To address the automatic alignment issue, several wireless charging devices with adaptive clamping and positioning functions have been proposed in the prior art. For example, document CN117650610A discloses a variable-form vehicle-mounted wireless charger, which achieves automatic clamping and positioning of the mobile phone through a hydraulic transmission system. Specifically, this device utilizes the mobile phone's own weight to compress the hydraulic oil in the piston cylinder, pushing the piston rods on both sides in a coordinated manner, thereby moving the clamping device towards the center and achieving centered positioning of the mobile phone.

[0004] Relying on mechanical and hydraulic transmission, the response speed and positioning accuracy are limited by the fluidity of the hydraulic medium and the system inertia, making it difficult to achieve sub-millimeter-level high-precision alignment; and relying solely on mechanical pushing to achieve coarse positioning, lacking active closed-loop alignment methods based on electromagnetics or sensors, it is impossible to ensure optimal coupling of the charging coil under complex postures.

[0005] Therefore, there is still a need for further improvement of the existing technology. Summary of the Invention

[0006] In summary, this invention proposes an in-vehicle wireless charger and its power distribution system.

[0007] The technical solution of this invention is implemented as follows:

[0008] A vehicle-mounted wireless charger, characterized in that it comprises:

[0009] The main body of the bracket has multiple degrees of freedom of movement, which is used to install and adjust the posture of the charging module;

[0010] A charging module, mounted on the main body of the bracket, includes:

[0011] A bracket used to support the device being charged;

[0012] At least two movable grippers for holding the device from both sides;

[0013] Wireless charging coils are used to power devices;

[0014] Multiple arc-shaped electromagnets are arranged around the wireless charging coil to attract the device and align the charging coil.

[0015] In this invention, the main body of the support includes: a mounting base;

[0016] The first swing arm is rotatably connected to the mounting base;

[0017] The second swing arm is hinged to the first swing arm;

[0018] The rotating end is rotatably connected to the second swing arm, and the charging module is mounted on the rotating end.

[0019] In this invention, the charging module further includes:

[0020] Drive motor;

[0021] A reduction gear set is connected to the drive motor for transmission.

[0022] An adjusting gear is connected to the reduction gear set;

[0023] A rack is mounted on each gripper and meshes with the adjusting gear to drive the gripper to move.

[0024] In this invention, the output end of the reduction gear set is connected to a turntable, and multiple arc-shaped electromagnets are mounted on the turntable.

[0025] In this invention, the vehicle-mounted wireless charger also includes multiple angle sensors, which are used to detect the horizontal rotation angle of the first swing arm and the pitch tilt angle of the second swing arm, respectively.

[0026] A vehicle-mounted wireless charger power distribution system is characterized in that the vehicle-mounted wireless charger power distribution system adjusts the magnetic force output of each arc-shaped electromagnet according to the posture of the bracket body.

[0027] In this invention, the reference magnetic flux density is calculated according to the following formula:

[0028]

[0029] In the formula, Indicates the reference magnetic flux density; Indicates the maximum set magnetic flux density; Indicates the pitch angle; Indicates the horizontal rotation angle.

[0030] In this invention, the magnetic force adjustment of each electromagnet is calculated based on the position deviation:

[0031]

[0032] In the formula, This represents the normalized position error, the real-time error signal of electromagnet i at time t; Indicates the proportional gain coefficient; Represents the differential gain coefficient.

[0033] Among these methods, the disturbance of the magnetic ring or coil on the back of the phone is detected, and the precise positional deviation of the center of the phone's charging coil relative to the center of the wireless charging coil is calculated in real time. , and possible deflection angle And mapped to the error of each individual electromagnet. superior.

[0034] In this invention, the normalized position error The calculation formula is as follows:

[0035]

[0036] in, This represents the projected distance from electromagnet i to the target charging coil; The nominal distance is from electromagnet i to the center of the wireless charging coil.

[0037] In this invention, after the charging coil is aligned, the gripper is controlled to clamp the device and enter full-power charging.

[0038] The vehicle-mounted wireless charger and its power distribution system according to the present invention have the following beneficial effects:

[0039] The main body of the bracket has multiple degrees of freedom in horizontal, pitch and rotation, and can flexibly adjust the charging angle according to the usage scenario and user habits. It also compensates for magnetic force in real time through posture sensing to ensure that the device does not slip and is reliably aligned when tilted.

[0040] By using multiple sensors to detect position deviations in real time and dynamically adjusting the magnetic force distribution of the surround electromagnet through a closed-loop algorithm, sub-millimeter-level coil alignment is achieved, significantly improving charging efficiency and stability. Attached Figure Description

[0041] Figure 1 is a schematic diagram of the structure of the vehicle-mounted wireless charger of the present invention;

[0042] Figure 2 is a schematic diagram of the structure of the vehicle-mounted wireless charger of the present invention;

[0043] Figure 3 is a schematic diagram of the structure of the vehicle-mounted wireless charger of the present invention;

[0044] Figure 4 is a schematic diagram of the structure of the vehicle-mounted wireless charger of the present invention;

[0045] Figure 5 is a schematic diagram of the structure of the vehicle-mounted wireless charger of the present invention;

[0046] Figure 6 is a flowchart of the vehicle-mounted wireless charger power distribution system of the present invention.

[0047] The reference numerals in the attached drawings are as follows: 10-bracket body, 101-mounting base, 102-first swing arm, 103-second swing arm, 104-rotating end, 20-charging module, 201-first outer shell, 202-bracket, 203-gripper, 204-first mounting bracket, 205-second mounting bracket, 206-drive motor, 207-reduction gear set, 208-adjusting gear, 209-rack, 210-turntable, 211-arc electromagnet, 212-wireless charging coil, 213-second outer shell. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0049] Example 1

[0050] Referring to Figures 1 to 5, this embodiment proposes a vehicle-mounted wireless charger, including a bracket body 10 and a charging module 20. The bracket body 10 includes a mounting base 101, on which a first swing arm 102 is rotatably connected. A second swing arm 103 is hinged to the end of the first swing arm 102 away from the mounting base 101. A rotating end 104 is vertically rotatably connected to the end of the second swing arm 103 away from the first swing arm 102, and the charging module 20 is mounted on the rotating end 104.

[0051] In this embodiment, the main body 10 of the bracket is composed of a mounting base 101, a first swing arm 102, a second swing arm 103, and a rotating end 104 connected in sequence. The mounting base 101 is a fixed base used to install the entire charger in a predetermined position on the vehicle; the first swing arm 102 is rotatably connected to the mounting base 101 and can rotate around the base in a horizontal plane or a set plane to adjust the orientation of the charging module 20 in the left and right directions; the second swing arm 103 is hinged to the first swing arm 102 and can swing in a vertical plane or within a set angle range to adjust the tilt angle and height of the charging module 20; the rotating end 104 is vertically rotatably connected to the end of the second swing arm 103 and can drive the charging module 20 on it to rotate around an axis perpendicular to the second swing arm 103 to achieve fine adjustment of the orientation of the charging surface.

[0052] Through the multi-degree-of-freedom coordination between the mounting base 101, the first swing arm 102, the second swing arm 103 and the rotating end 104, the bracket body 10 can be flexibly adjusted in multiple dimensions, ultimately enabling the charging module 20 installed on the rotating end 104 to adapt to different installation environments, user habits and equipment sizes, and achieve stable support and all-round, multi-angle charging positioning functions.

[0053] The charging module 20 includes a first housing 201, and a bracket 202 is fixedly connected to the bottom of the first housing 201. Clamping claws 203 are slidably connected to both sides of the first housing 201, wherein the bracket 202 is used to support the bottom of the phone, and the two clamping claws 203 are used to clamp the sides of the phone.

[0054] Inside the first housing 201, a first mounting bracket 204 and a second mounting bracket 205 that mesh with each other are also fixedly installed. A drive motor 206 is provided on the first mounting bracket 204, and a worm gear is provided on the output shaft of the drive motor 206. The worm gear meshes with a reduction gear set 207, and the drive motor 206 can drive the reduction gear set 207 to rotate.

[0055] The output end of the reduction gear set 207 is connected to the adjusting gear 208, meaning that the reduction gear set 207 and the adjusting gear 208 can rotate together via the drive motor 206. Each gripper 203 is equipped with a rack 209 that meshes with the adjusting gear 208. As the adjusting gear 208 rotates, the rack 209 drives the two grippers 203 to move closer together, thus clamping the outside of the phone.

[0056] A turntable 210 is rotatably connected to the second mounting bracket 205. The turntable 210 is connected to the output end of the reduction gear set 207, and the reduction gear set 207 drives the turntable 210 to rotate.

[0057] Referring again to Figure 4, the reduction gear set 207 consists of three consecutive gears with different gear ratios that mesh with each other. The first housing 201 and the second housing 213 are interlocked to form a sealed chamber. The first mounting bracket 204, the second mounting bracket 205, and the components mounted on them are all located within this sealed chamber.

[0058] A wireless charging coil 212 is installed on the inner side of the second outer shell 213. Multiple arc-shaped electromagnets 211 are arranged circumferentially along the wireless charging coil 212 at equal intervals. The electromagnets 211 attract the charging coil on the back of the phone and ensure that the wireless charging coil 212 is aligned with the charging coil on the back of the phone, thereby ensuring the charging power.

[0059] Furthermore, multiple arc-shaped electromagnets 211 are mounted on the turntable 210. When the turntable 210 rotates, it can drive the multiple arc-shaped electromagnets 211 to rotate together with the turntable 210.

[0060] In this embodiment, the mounting base 101 serves as a fixed base, providing a reliable installation foundation for the entire charger to be securely installed in a predetermined position inside the vehicle. The first swing arm 102 is rotatably connected to the mounting base 101 and can rotate in the horizontal plane, thus enabling a wide range of lateral adjustment of the charging module 20 to accommodate different usage positions such as the driver's seat or passenger seat. The second swing arm 103 is hinged to the first swing arm 102 and can tilt and swing in the vertical plane. This structure is used to finely adjust the height and tilt angle of the charging module 20, ensuring the charging device screen faces the user's most comfortable viewing angle. The rotating end 104 is vertically rotatably connected to the end of the second swing arm 103, driving the charging module 20 on it to rotate horizontally, ultimately achieving a final fine-tuning of the device's orientation towards a horizontal or vertical screen, thereby completing omnidirectional positioning in three-dimensional space.

[0061] The charging module 20 is mounted on the rotating end 104. A bracket 202 for supporting the bottom of the device is fixed to the bottom of its first housing 201, while two sliding grippers 203 are distributed on both sides of the first housing 201. Together, these three components form the support and clamping base of the device. Inside the first housing 201, a first mounting bracket 204 and a second mounting bracket 205 are fixed and interlocked, forming a robust internal frame. A drive motor 206 is mounted on the first mounting bracket 204. The worm gear on its output shaft meshes with a reduction gear set 207, which consists of three consecutive gears with different gear ratios, effectively reducing the rotational speed and increasing the output torque. The power of the drive motor 206 is transmitted to the adjusting gear 208 connected to its output end through the reduction gear set 207; each gripper 203 is provided with a rack 209 that meshes with the adjusting gear 208. When the adjusting gear 208 rotates, it can drive the grippers 203 on both sides to move synchronously towards each other, thereby automatically adapting to and clamping mobile phones and other devices of different widths, realizing a stable automatic clamping function and effectively preventing the equipment from slipping off during the ride.

[0062] Meanwhile, the turntable 210, rotatably connected to the second mounting bracket 205, is also connected to the output end of the reduction gear set 207 and can be synchronously driven to rotate. The first housing 201 and the second housing 213 interlock to form a sealed chamber, encapsulating the aforementioned transmission mechanism and serving the functions of dustproofing, protection, and integration. Inside the second housing 213, a wireless charging coil 212 for power transmission is installed, while multiple arc-shaped electromagnets 211, equidistantly arranged along the circumference of the coil, are mounted on the turntable 210. When the turntable 210 rotates, it drives all the arc-shaped electromagnets 211 to rotate together and generate magnetic force, which can actively attract metal parts or charging coils on the back of the device, ensuring that the charging coil on the back of the device and the wireless charging coil 212 are precisely aligned to ensure optimal charging efficiency and power.

[0063] Example 2

[0064] Based on the technical solution in Embodiment 1, multiple arc-shaped electromagnets 211 and their rotatable installation method are used to fine-tune the positioning of the device before clamping by controlling the magnetic force of each segment of the magnet ring at different angles of the bracket, so as to ensure that the charging coil on the back of the device is precisely aligned with the wireless charging coil 212.

[0065] Referring to Figure 6, this embodiment further proposes a vehicle-mounted wireless charger and its power distribution system, including: multiple angle sensors for monitoring the rotation angle of the first swing arm 102, the second swing arm 103 and the rotating end 104, for obtaining the current attitude angle of the bracket body 10.

[0066] Since the bracket body 10 of the vehicle wireless charger can adjust the posture of the mobile phone device along multiple degrees of freedom, and ensure that the wireless charging coil and the device charging coil can maintain effective pre-attachment and alignment in various postures, the magnetic force output of multiple arc electromagnets must be compensated for.

[0067] The formula for controlling the magnetic force of the arc-shaped electromagnet is as follows:

[0068]

[0069] In the formula, Represents the reference magnetic flux density, which is the target value of the static working magnetic flux density calculated and set for each arc electromagnet under the current support posture; The maximum set magnetic flux density refers to the maximum magnetic flux density that the electromagnet can generate under ideal horizontal reference conditions, that is, when the support body 10 is fully extended and the charging surface is horizontally facing up and down. The pitch angle, generated by the hinged movement of the second swing arm 103, refers to the forward and backward tilt angle of the charging module plane relative to the horizontal plane, and indicates the angle when the charging surface is horizontal. When tilting forward or backward, The absolute value increases. This angle value is measured in real time by an angle sensor integrated at the hinge of the second swing arm 103; The horizontal rotation angle, generated by the rotation of the first swing arm 102, refers to the deflection angle of the charging module in the horizontal plane relative to the vehicle's centerline or mounting reference direction. This angle value is measured in real time by an angle sensor integrated at the rotation axis of the first swing arm 102. The compensation function is used to quantify the influence of the bracket posture on the effective component of the magnetic force. The cosine function is used because the electromagnet's attraction force on the phone is most critical in the direction perpendicular to the charging coil plane. When there is an angle between the charging surface and the direction of gravity or the target alignment plane, the magnetic force component perpendicular to the charging surface is attenuated by the cosine function.

[0070] Specifically, angle sensors at the first swing arm 102 and the second swing arm 103 collect the current attitude data of the support in real time and accurately, i.e., the horizontal rotation angle. and pitch angle .

[0071] The obtained horizontal rotation angle and pitch angle Substituting the values ​​into the above formula, the total attenuation coefficient in the normal direction (i.e. the direction of effective adsorption force) of the charging module plane when it deviates from the ideal horizontal state in three-dimensional space is calculated.

[0072] For example, if a phone is placed on a tilted charging surface, gravity will cause it to slip. In this situation, if maximum magnetic force is applied... This not only increases energy consumption but may also interfere with positioning due to excessive lateral forces. This is addressed by adjusting the reference magnetic force to a level that matches the force required to maintain the current attitude. The calculated... This will serve as the initial operating point for all arc-shaped electromagnets.

[0073] The power distribution system outputs power to each arc-shaped electromagnet 211. The corresponding driving current generates a basic adsorption magnetic field that adaptively matches the current bracket posture the instant the phone is placed. The function of this reference magnetic field is to: initially stabilize the phone before the gripper 203 moves, preventing it from sliding due to the bracket tilt; and provide an initial adsorption force to bring the coil on the back of the phone and the wireless charging coil 212 into initial contact, creating good starting conditions for the subsequent closed-loop fine-tuning algorithm based on position deviation, and avoiding adjustment failure or oscillation due to excessive initial deviation.

[0074] After completing the magnetic reference compensation based on the bracket posture, a high-precision dynamic adjustment stage is required to achieve sub-millimeter-level precise alignment between the wireless charging coil and the device charging coil.

[0075] The goal of position deviation adjustment is to calculate the required magnetic force adjustment for each electromagnet i. The calculation formula is as follows:

[0076]

[0077] in,

[0078]

[0079] In the formula, This represents the normalized position error, the real-time error signal of electromagnet i at time t; This represents the projected component of the vector distance from the center of the magnetic force of electromagnet i to the ideal corresponding point of the target charging coil on the back of the phone at time t, projected onto the charging plane. This data comes from a high-precision magnetic positioning sensor array or a miniature vision sensor, which is integrated around the wireless charging coil 212 and can calculate the precise two-dimensional or three-dimensional coordinates of the phone charging coil in real time. The nominal distance from electromagnet i to the geometric center of wireless charging coil 212 when it is at rest is a fixed parameter. This distance is normalized and divided by... The purpose is to eliminate the inherent gain differences caused by different installation positions of various electromagnets, and to improve the control algorithm parameters. , It is applicable to all electromagnets.

[0080] in, Indicates the proportional gain coefficient; Represents the differential gain coefficient; This indicates that the magnetic flux density is dynamically adjusted, and the final calculated value needs to be superimposed on the reference magnetic force. The real-time adjustment value. Its value is a vector, and its direction is determined by... The direction determines whether it points towards or away from the target point to generate tension or thrust.

[0081] In this embodiment, after the mobile phone is initially attracted by the reference magnetic force, the precise positional deviation of the center of the mobile phone charging coil relative to the center of the wireless charging coil 212 is calculated in real time by detecting the disturbance of the magnetic ring or coil on the back of the mobile phone. , and possible deflection angle This will map the global deviation to the error of each individual electromagnet. superior.

[0082] According to the received Combined with fixed parameters Calculate the normalized error And further calculate its rate of change through digital difference. .Will and Substituting the values ​​into the control formula above, the proportional and derivative terms are calculated separately, and the summation yields the real-time magnetic force adjustment required for each electromagnet. .

[0083] Finally, the magnetic flux density will be dynamically adjusted. Compared with the reference magnetic flux density Vector synthesis is performed to obtain the final target magnetic flux density for each electromagnet. ,in, The power distribution system is based on the current-magnetic model of electromagnets. Calculate and drive the corresponding current value The coil passes through each electromagnet.

[0084] By independently controlling the current of multiple arc-shaped electromagnets surrounding the turntable 210, a non-uniform synthetic magnetic field with a specific gradient and direction can be generated on the charging plane. For example, by increasing the attraction force of the electromagnet on the right side of the phone and decreasing the attraction force on the left side, a net force can be generated that causes the phone to shift slightly to the left; through specific differential combinations, even a tiny corrective torque can be generated to adjust the phone's deflection angle. The phone undergoes a micro-displacement under the influence of the synthetic magnetic field, and its new position is captured again by the sensor, forming a new error signal. This process iterates continuously at a millisecond frequency until the position error in all directions is corrected. All values ​​are less than the system's set threshold, which is generally ±0.5mm. At this point, the alignment is considered complete, and the gripper 203 is then controlled to perform the final locking, and the system enters the full-power charging stage.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vehicle-mounted wireless charger, characterized in that, include: The main body of the bracket (10) has multiple degrees of freedom of movement, which is used to install and adjust the posture of the charging module; The charging module (20) is installed on the bracket body (10) and includes: a bracket (202) for supporting the device to be charged; At least two movable grippers (203) for holding the device from both sides; a wireless charging coil (212) for powering the device; and a plurality of arc-shaped electromagnets (211) arranged around the wireless charging coil (212) for attracting the device to align the charging coil.

2. The vehicle-mounted wireless charger according to claim 1, characterized in that, The bracket body (10) includes: a mounting base (101); a first swing arm (102) rotatably connected to the mounting base (101); a second swing arm (103) hinged to the first swing arm (102); and a rotating end (104) rotatably connected to the second swing arm (103), wherein the charging module (20) is mounted on the rotating end (104).

3. The vehicle-mounted wireless charger according to claim 2, characterized in that, The charging module (20) further includes: a drive motor (206); a reduction gear set (207) connected to the drive motor (206); an adjusting gear (208) connected to the reduction gear set (207); and a rack (209) disposed on each gripper (203) and meshing with the adjusting gear (208) for driving the grippers to move.

4. The vehicle-mounted wireless charger according to claim 3, characterized in that, The output end of the reduction gear set (207) is connected to a turntable (210), and multiple arc-shaped electromagnets (211) are installed on the turntable (210).

5. The vehicle-mounted wireless charger according to claim 2, characterized in that, The vehicle-mounted wireless charger also includes multiple angle sensors, which are used to detect the horizontal rotation angle of the first swing arm (102) and the pitch tilt angle of the second swing arm (103), respectively.

6. A vehicle-mounted wireless charger power distribution system, comprising the vehicle-mounted wireless charger as described in claim 1, characterized in that, The vehicle-mounted wireless charger power distribution system adjusts the magnetic output of each arc-shaped electromagnet (211) according to the posture of the bracket body.

7. The vehicle-mounted wireless charger power distribution system according to claim 6, characterized in that, The reference magnetic flux density is calculated using the following formula: In the formula, Indicates the reference magnetic flux density; Indicates the maximum set magnetic flux density; Indicates the pitch angle; Indicates the horizontal rotation angle.

8. The vehicle-mounted wireless charger power distribution system according to claim 7, characterized in that, Calculate the magnetic force adjustment of each electromagnet based on the position deviation: In the formula, This represents the normalized position error, the real-time error signal of electromagnet i at time t; Indicates the proportional gain coefficient; This represents the differential gain coefficient, where disturbances in the magnetic ring or coil on the back of the phone are detected, and the precise positional deviation of the phone's charging coil center relative to the wireless charging coil center is calculated in real time. 、 and possible deflection angle And mapped to the error of each individual electromagnet. superior.

9. The vehicle-mounted wireless charger power distribution system according to claim 8, characterized in that, The normalized position error The calculation formula is as follows: in, This represents the projected distance from electromagnet i to the target charging coil; The nominal distance is from electromagnet i to the center of the wireless charging coil.

10. The vehicle-mounted wireless charger power distribution system according to claim 6, characterized in that, After the charging coil is aligned, the control gripper (203) clamps the device and enters full-power charging.

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