Electromagnetic drive type position self-adaptive wireless charging seat device
By combining pressure sensors and electromagnetic drives, the wireless charging dock achieves rapid and precise alignment, solving the position and posture adjustment problems of traditional wireless charging docks, improving charging efficiency and system reliability, reducing noise and wear, and providing a better user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NORTHEASTERN UNIV CHINA
- Filing Date
- 2026-03-19
- Publication Date
- 2026-04-28
AI Technical Summary
Traditional wireless charging pads cannot achieve fast and accurate adaptive adjustment of position and posture, resulting in low charging efficiency. Furthermore, existing electromagnetic drive technology in wireless charging suffers from problems such as slow response speed, high noise, and severe mechanical wear.
By employing a pressure sensor combined with electromagnetic drive, the device position is detected in real time through a pressure sensing array. The control module drives a planar electromagnetic drive array and a permanent magnet array to achieve automatic alignment of the device. Combined with a universal joint design, adaptive adjustment of planar position and tilt angle is achieved.
It achieves fast and accurate device alignment, improves charging efficiency and system reliability, reduces noise and mechanical wear, extends system life, and provides a good user experience and scalability.
Smart Images
Figure CN224177974U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wireless charging technology, and in particular to an electromagnetically driven, position-adaptive wireless charging base device. Background Technology
[0002] With the rapid development and widespread application of wireless charging technology, users' demands for charging convenience are increasing. Traditional wireless charging pads typically employ a fixed-position design, requiring users to manually and precisely place the device to be charged within the charging area to achieve efficient energy transfer. However, in actual use, factors such as device placement deviations, differences in device size, and user habits often lead to inaccurate alignment between the transmitting and receiving coils, significantly reducing charging efficiency and even resulting in charging failures.
[0003] Currently, there are several improved wireless charging solutions on the market that attempt to achieve adaptive positioning through mechanical adjustment or sensor assistance. For example, some solutions use a stepper motor-driven translation stage to achieve position adjustment, but this method suffers from slow response speed, high noise, and severe mechanical wear. Other solutions use cameras or infrared sensors to detect the device's position, but these solutions are costly, susceptible to environmental interference, and require complex image processing algorithms. Furthermore, most existing adaptive charging docks can only achieve planar position adjustment and cannot simultaneously achieve adaptive posture adjustment, making it difficult to handle tilted devices.
[0004] While electromagnetic drive technology boasts advantages such as fast response, high precision, and no mechanical contact, its application in wireless charging still faces several technical challenges. For example, how to organically combine electromagnetic drive with position detection, how to achieve rapid and precise control, and how to reduce system complexity are all technical issues that need to be addressed. Utility Model Content
[0005] To address the shortcomings of existing technologies, this invention provides an electromagnetically driven, position-adaptive wireless charging dock. By combining pressure sensor sensing with electromagnetic drive, it achieves automatic detection and precise alignment of the device to be charged, effectively improving the efficiency and reliability of wireless charging.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] An electromagnetically driven, position-adaptive wireless charging dock includes a base housing, within which a planar electromagnetic drive array is fixed. Above the planar electromagnetic drive array is a permanent magnet array, and above the permanent magnet array is an XY-axis translation stage. A universal joint is connected above the XY-axis translation stage, and a rotary adjustment stage is connected above the universal joint. A pressure sensing array is arranged above the rotary adjustment stage. The rotary adjustment stage is located in the middle of an upper housing, which is sealed to the base housing. A transmitting coil assembly is located inside the rotary adjustment stage and is connected to an external power source for charging the charging device. The transmitting coil assembly, pressure sensing array, and planar electromagnetic drive array are connected to a control module fixed inside the upper housing.
[0008] A low-friction guide mechanism is provided above the base housing. The low-friction guide mechanism includes a linear guide rail, an XY-axis translation stage located above the linear guide rail, and a constraint frame provided on the outer side of the XY-axis translation stage. The bottom of the constraint frame is fixed above the base housing.
[0009] The planar electromagnetic drive array includes multiple micro-drive coils, which are evenly distributed in a matrix grid.
[0010] The pressure sensing array consists of four pressure sensors fixed on the upper surface of the rotating adjustment table in a rectangular arrangement, with a center-to-center distance of 50±0.5mm between adjacent sensors.
[0011] The permanent magnet array consists of multiple rectangular neodymium iron boron permanent magnets arranged in a Halbach array pattern.
[0012] The universal joint adopts a ball joint structure and has built-in silicon-based damping grease, with a damping torque range of 0.05 N·m to 0.1 N·m.
[0013] The transmitting coil assembly is made of Litz wire and has a thermally conductive silicone pad with a thickness of 2.0mm ± 0.1mm and a thermal conductivity of not less than 5W / (m·K) between it and the inner wall of the rotating adjustment table.
[0014] A magnetic shielding layer is provided around the planar electromagnetic drive array.
[0015] The beneficial effects of this utility model are as follows:
[0016] 1. This utility model uses a pressure sensing array to detect the pressure distribution of the device to be charged in real time. The control module drives a planar electromagnetic drive array according to the pressure distribution. The planar electromagnetic drive array and the permanent magnet array generate driving force through electromagnetic interaction, causing the XY-axis translation stage to move along the horizontal plane under the drive of electromagnetic force. The universal joint above the XY-axis translation stage realizes adaptive adjustment of the tilt angle as the XY-axis translation moves, until the pressure distribution of the device to be charged is uniform as detected by the pressure sensing array. Then, the control module controls the electromagnetic drive array to stop working, and at the same time, the control module drives the transmitting coil assembly to charge the device to be charged.
[0017] 2. This utility model uses a pressure sensing array to detect the pressure distribution of the device in real time, and combines it with an electromagnetic drive system to achieve rapid and accurate position adjustment, effectively solving the problem of inaccurate alignment of traditional wireless charging docks; it adopts planar electromagnetic drive technology, which has the advantages of fast response speed, high motion accuracy, no mechanical wear, and low noise, significantly improving the reliability and service life of the system.
[0018] 3. The unique universal joint design of this utility model enables the system to simultaneously achieve adaptive adjustment of planar position and tilt angle, adapting to different equipment sizes and placement postures, greatly improving the user experience.
[0019] 4. The modular design concept of this utility model makes the system structure compact, easy to produce and maintain, and has good scalability. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of an electromagnetically driven, position-adaptive wireless charging dock device according to this utility model.
[0021] Figure 2 This is an exploded view of an electromagnetically driven, position-adaptive wireless charging base device according to this utility model.
[0022] In the attached diagram, 1 is the pressure sensing array; 2 is the control module; 3 is the XY translation stage; 4 is the rotary adjustment stage; 5 is the upper housing; 6 is the planar electromagnetic drive array; 7 is the permanent magnet array; 8 is the base housing; 9 is the low-friction guide mechanism; 901 is the linear guide rail; 902 is the constraint frame; and 10 is the universal joint. Detailed Implementation
[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0024] like Figure 1 and Figure 2As shown, this embodiment provides an electromagnetically driven, position-adaptive wireless charging dock. The device adopts a modular design concept, which highly integrates functions such as intelligent sensing, precision driving, and energy transmission.
[0025] An electromagnetically driven, position-adaptive wireless charging dock includes a base housing 8, which provides structural support and a mounting foundation for the entire system. The base housing 8 is made of aluminum alloy, which has good mechanical strength and heat dissipation performance. A planar electromagnetic drive array 6 is fixed inside the base housing 8, and a permanent magnet array 7 is arranged above the planar electromagnetic drive array 6. The permanent magnet array 7 and the planar electromagnetic drive array 6 are arranged opposite each other in the vertical direction. An XY-axis translation stage 3 is arranged above the permanent magnet array 7. The XY-axis translation stage 3 is made of carbon fiber composite material, which has the characteristics of being lightweight and high-strength. A universal joint 10 is connected above the XY-axis translation stage 3, and a rotary adjustment stage 4 is connected above the universal joint 10. The rotary adjustment stage 4 is made of engineering plastic injection molding and has an anti-slip texture on its surface. A pressure sensing array 1 is arranged above the rotary adjustment stage 4 to detect the pressure distribution of the device to be charged in real time. The rotary adjustment stage 4 is located in the middle of the upper housing 5, and the upper housing 5 is sealed to the base housing 8. A transmitting coil assembly is installed inside the rotary adjustment stage 4, which moves and rotates with the rotary adjustment stage 4 to achieve precise alignment with the receiving coil of the device to be charged. The transmitting coil assembly is connected to an external power source through a flexible wire for charging the device to be charged. The transmitting coil assembly, the pressure sensing array 1, and the planar electromagnetic drive array 6 are connected to a control module 2 fixed inside the upper housing 5. The signal input terminal of the control module 2 is electrically connected to the pressure sensing array 1 to receive the position distribution data of the device to be charged and generate corresponding displacement control signals. The planar electromagnetic drive array 6 is connected to the signal output terminal of the control module 2 to drive the planar electromagnetic drive array 6 according to the displacement control signals, and drives the horizontal translation movement of the XY-axis translation stage 3 through interaction with the permanent magnet array 7.
[0026] The control module 2 uses an STM32 series ARM microcontroller with a main frequency of 168MHz. It is equipped with a 12-bit ADC sampler and multiple PWM outputs. Its ADC sampling channel is connected to the signal output terminal of the pressure sensing array 1, and the PWM output terminal is connected to the miniature driving coils of each phase of the planar electromagnetic drive array 6 through a drive circuit.
[0027] In this embodiment, during use, the device to be charged is placed on the rotating adjustment platform 4. The pressure sensing array 1 on the rotating adjustment platform 4 senses the pressure of the device to be charged and transmits the pressure distribution data to the control module 2. The control module 2 drives the planar electromagnetic drive array 6 according to the pressure distribution data transmitted by the pressure sensing array 1. The planar electromagnetic drive array 6 and the permanent magnet array 7 generate driving force through electromagnetic interaction, causing the XY-axis translation platform 3 to move along the horizontal plane under the drive of electromagnetic force. The universal joint 10 above the XY-axis translation platform 3 achieves adaptive adjustment of tilt angle as the XY-axis translation platform 3 moves until the pressure distribution of the device to be charged, as detected by the pressure sensing array 1, is uniform. Then, the control module 2 controls the electromagnetic drive array to stop working, and at the same time, the control module drives the transmitting coil assembly to charge the device to be charged.
[0028] A low-friction guide mechanism 9 is provided above the base housing 8. The low-friction guide mechanism 9 includes a linear guide rail 901. The XY-axis translation stage 3 is located above the linear guide rail 901. A constraint frame 902 is provided on the outer side of the XY-axis translation stage 3. The bottom of the constraint frame 902 is fixed above the base housing 8. The low-friction guide mechanism 9 can reduce the coefficient of motion friction to an extremely low level, ensuring the smoothness, accuracy, high precision and low friction characteristics of the translation stage movement. The constraint frame 902 ensures that the XY-axis translation stage will not move excessively and collide with the base housing 8, thus reducing friction.
[0029] The pressure sensing array 1 consists of four piezoresistive pressure sensors fixed to the upper surface of the rotary adjustment platform 4 in a rectangular arrangement. The piezoresistive pressure sensors adopt a Wheatstone bridge structure, with a measurement range of 0-10N and a resolution of 0.01N. The piezoresistive pressure sensors are arranged in a rectangular pattern with a spacing of 50mm and communicate with the control module via an I2C digital bus, with a sampling frequency of 100Hz. This arrangement can accurately detect the center of gravity position of the device to be charged, providing reliable position feedback information to the control module. The output terminals of the four piezoresistive pressure sensors in the pressure sensing array are respectively connected to the four ADC sampling channels of the control module.
[0030] The spacing between the centers of adjacent piezoresistive pressure sensors is an integer multiple of the spacing between the centers of adjacent driving micro-coils in a planar electromagnetic drive array.
[0031] The planar electromagnetic drive array 6 includes multiple miniature drive coils, which are evenly distributed in a matrix grid. In this embodiment, the substrate of the planar electromagnetic drive array 6 is a printed circuit board, on which multiple sets of drive coil traces are etched. The 64 miniature drive coils are arranged in an 8×8 matrix. Each drive coil is wound with 15 turns of enameled copper wire with a diameter of 0.5 mm, and the center-to-center spacing of the coils is 10 mm. The multiple miniature drive coils include multiple X-axis drive coil groups and multiple Y-axis drive coil groups. To achieve independent driving of the X-axis drive coil groups and the Y-axis drive coil groups, the current input terminals of all drive coils in the same X-axis drive coil group are connected in parallel and are connected to a common X-axis drive bus. The current input terminals of all drive coils in the same Y-axis drive coil group are connected in parallel and are connected to a common Y-axis drive bus. The current output terminals of all drive coils are connected to a common ground terminal.
[0032] Each of the X-axis drive bus and Y-axis drive bus is connected to its corresponding drive circuit and is independently controlled by the control module 2. When the device to be charged is placed on the surface of the rotating adjustment table and the pressure distribution is biased to the right, the value of the right sensor of the pressure sensing array is greater than that of the left sensor. The control module outputs a positive X-axis displacement signal. At this time, a positive current is passed through the X-axis drive coil group to generate a traveling wave magnetic field, which interacts with the permanent magnet in the permanent magnet array 7 that is directly opposite its projection area, generating an electromagnetic thrust along the positive X-axis direction. That is, the planar electromagnetic drive array 6 generates an electromagnetic thrust to the right. The XY-axis translation stage 3 drives the rotary adjustment stage 4 to move to the right. At the same time, the universal joint 10 automatically adjusts the tilt angle according to the center of gravity of the equipment until the values of the four pressure sensors reach a balanced state. Similarly, when the device to be charged is placed on the surface of the rotary adjustment stage 4 and the pressure distribution is biased towards the front, the control module outputs a positive displacement signal on the Y-axis. At this time, a positive current is passed through the Y-axis drive coil group to generate a traveling wave magnetic field, which interacts with the permanent magnet in the permanent magnet array 7 that is directly opposite to its projection area to generate an electromagnetic thrust along the positive direction of the Y-axis. That is, the planar electromagnetic drive array 6 generates a forward electromagnetic thrust, driving the XY-axis translation stage 3 to move the rotary adjustment stage 4 forward.
[0033] The permanent magnet array 7 consists of multiple rectangular neodymium iron boron permanent magnets arranged in a Halbach array pattern. Specifically, the array comprises 64 neodymium iron boron permanent magnets arranged in a Halbach array pattern. Each permanent magnet measures 8mm × 8mm × 3mm, and the magnetization direction of each neodymium iron boron permanent magnet is perpendicular to the XY direction. The magnetization directions of adjacent NdFeB permanent magnets are opposite to those of the bottom surface of the translation stage 3. Permanent magnets magnetized towards the base housing 8 are called N-pole permanent magnets, and those magnetized away from the base housing 8 are called S-pole permanent magnets. Multiple NdFeB permanent magnets are arranged in an alternating N-pole and S-pole configuration, with adjacent magnets having opposite polarities. This ensures that when the X-axis drive coil group is energized, it generates an effective X-direction electromagnetic thrust with the permanent magnet projecting directly below it; when the Y-axis drive coil group is energized, it generates an effective Y-direction electromagnetic thrust. The Halbach array enhances the unilateral magnetic field strength, improves electromagnetic drive efficiency, and reduces magnetic interference to the surrounding environment. The working air gap between the permanent magnet array 7 and the planar electromagnetic drive array 6 is set to 0.8mm. This distance is optimized to ensure sufficient electromagnetic force output while avoiding potential mechanical interference.
[0034] The universal joint 10 adopts a ball joint structure to achieve multi-degree-of-freedom rotation. It has built-in silicon-based damping grease with a damping torque range of 0.05 N·m to 0.1 N·m. This design not only ensures the adaptive adjustment capability of the rotary adjustment table 4, but also avoids the problem of equipment shaking caused by excessive flexibility.
[0035] The transmitting coil assembly is wound with Litz wire. The assembly is wound with 0.1mm×100 strands of Litz wire. The outer diameter of the coil is 60mm, the inner diameter is 30mm, and there are 12 turns in total. A 2mm thick thermally conductive silicone pad is provided between the coil and the inner wall of the rotating adjustment table 4 to ensure good thermal management. The thermal conductivity is not less than 5W / (m·K). This design ensures both the electrical performance of the coil and good heat dissipation.
[0036] In this example, a magnetic shielding layer of 0.5mm thick permalloy material is set around the planar electromagnetic drive array 6; secondly, the transmitting coil adopts an electromagnetic shielding design to reduce electromagnetic leakage; finally, all signal lines use shielded cables to ensure the stability of signal transmission.
[0037] The working principle of this utility model is as follows:
[0038] When the device to be charged is placed on the surface of the rotating adjustment platform 4, the pressure sensing array 1 detects the pressure distribution of the device in real time, and the control module calculates the coordinates of the device's center of gravity based on the values from the four pressure sensors. If a deviation in the device's position is detected, the control module generates a corresponding displacement control signal, which controls the energizing state of a specific coil group in the planar electromagnetic drive array 6 through the drive circuit.
[0039] The planar electromagnetic drive array 6 and the permanent magnet array 7 interact to generate electromagnetic force, driving the XY-direction translation stage 3 to move in the desired direction. When the XY-direction translation stage 3 moves to the target position area, the control module cuts off the drive current, causing the XY-direction translation stage 3 to brake and stop under the action of friction on the sliding mating surface. At the same time, due to the effect of the equipment's gravity, the rotary adjustment stage 4 achieves adaptive tilt adjustment through the universal joint 10. The entire adjustment process is achieved through closed-loop control. When the pressure distribution detected by the pressure sensing array 1 reaches a balanced state, the control module determines that the alignment is complete and starts the wireless charging process.
[0040] In practical use, when a user places a mobile phone or other device on the surface of the rotating adjustment platform 4, the pressure sensing array 1 can complete position detection within 100ms. The control module determines whether position adjustment is needed based on the detection result. If adjustment is required, the system will complete the movement and alignment process within 200ms, and then initiate wireless charging. Throughout the process, the device moves smoothly and precisely, without noticeable vibration or noise. Actual testing shows that under normal operating conditions, the charging efficiency reaches over 85%, significantly better than traditional wireless charging solutions. Simultaneously, the system power consumption is less than 5W, and the standby power consumption is less than 0.5W, demonstrating excellent energy-saving performance.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and not to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the protection scope of this utility model.
Claims
1. An electromagnetically driven, position-adaptive wireless charging dock device, characterized in that, The device includes a base housing, within which a planar electromagnetic drive array is fixed. Above the planar electromagnetic drive array is a permanent magnet array, and above the permanent magnet array is an XY-axis translation stage. A universal joint is connected above the XY-axis translation stage, and a rotary adjustment stage is connected above the universal joint. A pressure sensing array is arranged above the rotary adjustment stage. The rotary adjustment stage is located in the middle of an upper housing, which is sealed to the base housing. A transmitting coil assembly is located inside the rotary adjustment stage and is connected to an external power source for charging the charging device. The transmitting coil assembly, pressure sensing array, and planar electromagnetic drive array are connected to a control module fixed inside the upper housing.
2. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, A low-friction guide mechanism is provided above the base housing. The low-friction guide mechanism includes a linear guide rail, an XY-axis translation stage located above the linear guide rail, and a constraint frame provided on the outer side of the XY-axis translation stage. The bottom of the constraint frame is fixed above the base housing.
3. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, The planar electromagnetic drive array includes multiple micro-drive coils, which are evenly distributed in a matrix grid.
4. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, The pressure sensing array consists of four pressure sensors fixed on the upper surface of the rotating adjustment table in a rectangular arrangement, with a center-to-center distance of 50±0.5mm between adjacent sensors.
5. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, The permanent magnet array consists of multiple rectangular neodymium iron boron permanent magnets arranged in a Halbach array pattern.
6. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, The universal joint adopts a ball joint structure and has built-in silicon-based damping grease, with a damping torque range of 0.05 N·m to 0.1 N·m.
7. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, The transmitting coil assembly is made of Litz wire and has a thermally conductive silicone pad with a thickness of 2.0mm ± 0.1mm and a thermal conductivity of not less than 5W / (m·K) between it and the inner wall of the rotating adjustment table.
8. The electromagnetically driven, position-adaptive wireless charging dock device according to claim 1, characterized in that, A magnetic shielding layer is provided around the planar electromagnetic drive array.