A wireless power transmission device and system based on an adaptive transmitting coil

Abstract

The present disclosure provides a wireless power transmission device and system based on adaptive transmitting coil, comprising: a plurality of transmitting modules, each transmitting module comprising a transmitting coil, a transmitting side compensation network and a transmitting side converter connected in sequence; a coil detection module connected with the transmitting coil, for detecting the coil operating parameters of the transmitting coil; a state regulation module connected with the coil detection module, for determining a target phase difference and a target phase shift angle based on the correlation information between the coil operating parameters, the phase difference of the excitation current of the transmitting coil, the phase shift angle and the output power of the receiving end corresponding to the wireless power transmission device; a transmitting end control module connected with the state regulation module and the transmitting side converter, for generating a control signal based on the target phase difference and the target phase shift angle to control the output voltage of the transmitting side converter, so that the output power of the receiving end is kept within a preset range.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of wireless power transmission, and in particular to a wireless power transmission device based on adaptive transmitting coil and a transmission system. BACKGROUND

[0002] The existing wireless power transmission technology has low transmission power and transmission efficiency, and occupies large space and has high cost. SUMMARY

[0003] The present disclosure provides a wireless power transmission device based on adaptive transmitting coil to solve the above technical problems to some extent.

[0004] In a first aspect, the present disclosure provides a wireless power transmission device based on adaptive transmitting coil, comprising:

[0005] a plurality of transmitting modules, each of which comprises a transmitting coil, a transmitting side compensation network and a transmitting side converter connected in sequence;

[0006] a coil detection module connected with the transmitting coil, configured to detect coil operating parameters of the transmitting coil;

[0007] a state regulation module connected with the coil detection module, configured to determine a target phase difference and a target phase shift angle based on the correlation information between the coil operating parameters, the phase difference of the excitation current of the transmitting coil, the phase shift angle and the output power of the receiving end corresponding to the wireless power transmission device;

[0008] a transmitting end control module connected with the state regulation module and the transmitting side converter, configured to generate a control signal based on the target phase difference and the target phase shift angle to control the output voltage of the transmitting side converter, so that the output power of the receiving end is kept within a preset range.

[0009] In a second aspect, the present disclosure provides a wireless power transmission system based on adaptive transmitting coil, comprising:

[0010] the wireless power transmission device based on adaptive transmitting coil as described in the first aspect;

[0011] and a wireless power receiving device configured to receive the power transmitted from the wireless power transmission device and provide to a load.

[0012] From the above, it can be seen that the adaptive transmitting coil based wireless power transmitting device and transmission system provided by the present disclosure, by adopting a plurality of transmitting modules, each module being equipped with a transmitting coil, a compensation network and a transformer, and by adopting a coil detection module to monitor the working parameters of the transmitting coil in real time, a state control module determines a target phase difference and a target phase shift angle according to the correlation information between the parameters, the phase difference of the excitation current and the phase shift angle and the output power of the receiving end. Subsequently, a transmitting end control module generates a control signal based on the target phase difference and the target phase shift angle to precisely adjust the output voltage of the transmitting side transformer. The stability and efficiency of the wireless energy transmission system are effectively improved, the omnidirectional wireless power transmission of the adaptive rotating coil is realized, and the compatibility of the system for different application scenarios is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present disclosure or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort.

[0014] Figure 1 A schematic diagram of the adaptive transmitting coil based wireless power transmitting system of the embodiments of the present disclosure. DETAILED DESCRIPTION

[0015] In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0016] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the usual meaning understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second" and the like used in the embodiments of the present disclosure do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0017] With the development of wireless power transmission technology and the continuous expansion of application scenarios, the demand for wireless charging has gradually expanded from the traditional fixed alignment charging mode to omnidirectional, wide range, and high degree of freedom. For example, in the dynamic wireless charging process of smart home and the like, in order to provide convenient wireless charging, higher requirements are put forward for the degree of freedom of wireless power transmission, and even if the mobile phone is placed randomly, it can also be easily charged. At the same time, the size of the charging device varies due to different scenes, thereby affecting the coupling of the system. However, in the related art, when a spatial three-dimensional omnidirectional wireless power transmission is used, the occupied space volume is large, and the application cost is high, which is difficult to popularize. When a combined transmitting coil structure is used, the mutual inductance between the single transmitting coils needs to be considered. These all bring great difficulties to the research and development and updating of omnidirectional wireless charging equipment. Therefore, how to improve the transmission power and transmission efficiency of wireless power transmission, reduce the occupied space, reduce the cost, and meet the application requirements of various scenes has become a technical problem to be solved.

[0018] Therefore, the wireless power transmission system based on an adaptive transmitting coil provided by the embodiments of the present disclosure can effectively improve the stability and efficiency of the wireless power transmission system, realize omnidirectional wireless power transmission of the adaptive rotating coil, and improve the compatibility of the system for different application scenarios.

[0019] Referring to Figure 1 , Figure 1 A schematic diagram of a wireless power transmission system based on an adaptive transmitting coil is shown. Figure 1 In the wireless power transmission system based on an adaptive transmitting coil, the wireless power transmission system based on an adaptive transmitting coil can include:

[0020] a wireless power transmitting device based on an adaptive transmitting coil;

[0021] and a wireless power receiving device for receiving electric energy transmitted from the wireless power transmitting device and providing the electric energy to a load.

[0022] In the wireless power transmission system based on an adaptive transmitting coil, the wireless power transmission system based on an adaptive transmitting coil can include a wireless power transmitting device based on an adaptive transmitting coil and a wireless power receiving device. Specifically, as Figure 1As shown, the wireless power transmitting device based on adaptive transmitting coils can include multiple transmitting devices, and the transmitting coils of each transmitting device are coaxially arranged. Each transmitting coil adopts a separate LCC compensation network, and the series inductance and parallel capacitance in the compensation network can be of the same value, and the series capacitance can be a variable capacitance. Different transmitting devices can adopt the same DC power supply or separately adopt a separate DC power supply to provide energy. The wireless power receiving device can adopt an S compensation network topology, mainly composed of a receiving coil, a series compensation capacitor and a load.

[0023] The wireless power transmission system based on adaptive transmitting coils in the embodiments of the present disclosure can adopt an LCC-S compensation network, which utilizes the magnetic coupling resonance principle to realize wireless transmission of electric energy by adjusting the circuit parameters of the transmitting end and the receiving end. "LCC" can refer to the combination of inductance (L), capacitance (C) and another capacitance (C) to form a resonance circuit; and "S" can refer to the series compensation network on the receiving side. The LCC compensation network connected with the transmitting coil in the coaxial multi-transmitting coil wireless power transmission system satisfies the resonance condition when working.

[0024] In some embodiments, the wireless power receiving device comprises:

[0025] a receiving coil for receiving the electric energy;

[0026] a receiving side compensation network connected with the receiving coil for compensating the electric energy to offset noise and loss in the transmission process;

[0027] a receiving side converter connected with the receiving side compensation network for converting the electric energy and providing it to a load.

[0028] Specifically, the electric energy receiving device can include an S compensation topology and a rectifier, and the receiving end can adopt a coil of any structure, including circular, square, polygonal and the like.

[0029] In some embodiments, the multiple transmitting coils can adopt the same design, for example, a planar coil structure, and the structure type can be circular, square, polygonal and the like.

[0030] In some embodiments, in the transmitting side compensation network of the transmitting coil, the series inductance and parallel capacitance can be designed according to different requirements, and the series capacitance is a variable capacitance which can be changed in real time according to different working conditions.

[0031] Specifically, as shown in FIG. 1, the wireless power transmission system based on adaptive transmitting coils can include multiple transmitting devices, and the transmitting coils of each transmitting device are coaxially arranged. Figure 1As shown, the transmitting end electric energy conversion device 101, the transmitting end wireless electric energy transmission compensation network 102 and the transmitting end wireless electric energy transmission coil 103 can be analyzed and controlled. The spacing of the transmitting end wireless electric energy transmission coil 102 and the angle offset of the receiving end wireless electric energy transmission coil affect the system parameters. Through the micro control unit 104 and the real-time detection module 105, the real-time calculation of the internal parameters of the transmitting end wireless electric energy transmission coil 103 is realized, the misalignment distance between the transmitting coils is determined, and the real-time measurement of the mutual inductance parameters between the transmitting end wireless electric energy transmission coil 103 and the receiving end wireless electric energy transmission coil is realized. The micro control unit module 104 is combined with the linear Hall sensor, the main control unit MCU calculates different misalignment distances D, and according to the tuning stage where it is located, a control signal is sent to the capacitor switching array to control the on-off of the relay and the switching of the capacitor, and the tuning control process of the positioning system is completed. According to the data obtained by the real-time detection module 105, the system performance optimization and operation state regulation module 106 calculates the optimal parameters of the excitation current under different working conditions and gives the optimal control strategy. For example, the rotating working conditions can include three kinds: the receiving coil rotates relative to the transmitting coil around the x-axis, the receiving coil rotates relative to the transmitting coil around the y-axis, and the receiving coil rotates relative to the transmitting coil around the z-axis. In different rotating conditions, the corresponding α and β are different, that is, the phase difference of the excitation current is also different, and the control is carried out by adjusting different α and β.

[0032] Through the system performance optimization and operation state regulation module 106, the series variable capacitor switching array real-time control module 107 and the transmitting end electric energy converter real-time control module 109 are adjusted at the same time, and the system comprehensive optimization is realized. The variable capacitor switching array real-time measurement module 108 is used for real-time measurement. When the relay S0 is connected to the upper contact, the system can realize power transmission; when S0 is connected to the lower contact, the system switches to the coil positioning mode; and when the relay S0 is connected to the upper contact, the variable capacitor value compares the measured value with the capacitor value given by the system performance optimization and operation state regulation module 105, so that the variable capacitor values of each transmitting coil compensation network are as close to the calculated value as possible, and the transmitting coil decoupling is realized. Through the system fault self-detection and tolerance control module 110, the micro control unit module 104, the real-time detection module 105, the system performance optimization and operation state regulation module 106, the series variable capacitor switching array real-time control module 107 and the transmitting end electric energy converter real-time control module 109 are detected for faults. If a fault or a fault trend is found, the corresponding fault tolerance control method is used.

[0033] According to the embodiments of the present disclosure, the wireless electric energy transmitting device based on the adaptive transmitting coil can include:

[0034] A plurality of transmitting modules, each of which includes a transmitting coil, a transmitting side compensation network and a transmitting side converter connected in sequence.

[0035] The coil detection module is connected with the transmitting coil and is configured to detect a coil operating parameter of the transmitting coil.

[0036] The state regulation module is connected with the coil detection module and is configured to determine a target phase difference and a target phase shift angle based on the coil operating parameter, a phase difference of the excitation current of the transmitting coil, a phase shift angle, and associated information between the output power of the receiving end corresponding to the wireless power transmission device.

[0037] The transmitting end control module is connected with the state regulation module and the transmitting side converter and is configured to generate a control signal based on the target phase difference and the target phase shift angle to control the output voltage of the transmitting side converter, so that the output power of the receiving end is kept within a preset range.

[0038] Figure 1 In the adaptive transmitting coil-based wireless power transmission system, a power supply, a transmitting end electric energy conversion device 101, a transmitting end wireless power transmission compensation network 102, a transmitting end wireless power transmission coil 103, a receiving end wireless power transmission coil and compensation network, a receiving end electric energy conversion device, and a load are included. The transmitting end electric energy conversion device 101 includes a transmitting end electric energy converter 101-1, a transmitting end electric energy converter 101-2, and a transmitting end electric energy converter 101-n. The transmitting side compensation network 102 includes a series variable capacitance switching array 102-1, a series variable capacitance switching array 102-2, and a series variable capacitance switching array 102-n. The variable capacitance switching array can include a variable capacitance and a capacitance switching array (a plurality of capacitors C1, C2, …, Cn in parallel) in parallel, and each capacitor is connected to the normally open (or normally closed) contact of an independent relay S1, S2, …, Sn according to actual needs. The transmitting end wireless power transmission coil 103 is composed of a wireless power transmission coil 103-1, a wireless power transmission coil 103-2, and a wireless power transmission coil 103-n. It should be understood that n can be selected according to different application conditions, and is not limited here.

[0039] The adaptive transmitting coil-based wireless power transmission system adopts an LCC-S compensation network. According to the characteristics of the LCC-S compensation network, the series inductance and the parallel capacitance of each transmitting coil can adopt the same value, and the series inductance and the parallel capacitance are ensured to resonate. Due to the existence of cross coupling between coils in the planar combined transmitting coil structure, the equivalent self-inductance of each transmitting coil is related to the mutual inductance between them, so the tuning control of the transmitting coil positioning system can be completed by controlling the on-off of the relay and the switching of the capacitor, and the switched series variable capacitance is considered as a variable under different misalignment distances D.

[0040] Specifically, as Figure 1As shown, the power supply can be a direct current power supply in the form of a battery or the like. The transmitting end power conversion device 101 is a direct current-alternating current converter, which converts direct current of a battery or the like into high-frequency alternating current, and has a function of adjusting the amplitude, frequency, pulse width, etc. of the output high-frequency alternating current.

[0041] The transmitting end compensation network 102 adopts a compensation network topology of LCC, and includes a series inductor, a parallel capacitor, and a series variable capacitor switching array. The series capacitor switching array in each transmitting coil compensation network is composed of a real-time controllable variable capacitor and a capacitor switching array in parallel. The transmitting end compensation network 102 can compensate for the load impedance of the transmitting end power conversion device 101, so as to realize adjustment of the power, efficiency, soft switching, etc. of the wireless power transmission system. The receiving end compensation network can adopt a compensation network topology, which is used to compensate for the system load impedance of the receiving end power conversion device and the load as a whole, so as to realize adjustment of the power, efficiency, soft switching, etc. of the wireless power transmission system. The high-frequency alternating current output by the transmitting end power conversion device 101 is compensated by the transmitting end compensation network, and then generates a high-frequency electromagnetic field through the transmitting coil. The high-frequency electromagnetic field propagates in space and is received by the receiving coil to supply power to the receiving end. The wireless power transmission coil 103 can be composed of three transmitting coils of the same size and shape. The spacing between the transmitting coils and the current flowing through each transmitting coil are variable.

[0042] The receiving end power conversion device is used to convert the high-frequency alternating current compensated by the receiving end compensation network after being received by the receiving coil into a form required by the load. When the load is a direct current load, the receiving end power conversion device is an alternating current-alternating current converter. The high-frequency alternating current is converted into direct current. When the load is an alternating current load, the receiving end power conversion device is an alternating current-alternating current converter, which can convert the high-frequency alternating current into alternating current of a corresponding frequency. At the same time, the receiving end power conversion device has a function of adjusting and controlling the load voltage and current. The load can be an alternating current load such as an alternating current motor, or a direct current power supply such as a battery to be charged or a direct current motor.

[0043] The mutual inductance between the transmitting coil and the receiving coil is affected by the angle offset between the transmitting coil and the receiving coil. The mutual inductance between the transmitting coil and the receiving coil is affected by the misalignment distance between the transmitting coils. The change of the mutual inductance between the transmitting coil and the receiving coil and the change of the load will cause the change of the control parameters.

[0044] In some embodiments, the coil detection module comprises:

[0045] The micro control unit module is connected with the transmitting coil, and is used to determine the misalignment distance of the transmitting coil.

[0046] The real-time detection module is connected with the micro control unit module, and is used for determining a first mutual inductance value between the transmitting coils based on the misalignment distance, and detecting an angle offset between a receiving coil of a receiving end and the transmitting coils, and determining a second mutual inductance value between the transmitting coils and the receiving coil based on the angle offset.

[0047] The misalignment distance can refer to an overlapping distance between the transmitting coils. The micro control unit 104 performs Kalman filtering on the digital signal according to the master MCU, takes the center point of the secondary coil as a coordinate origin, and uses a coil positioning algorithm and known coil parameters to calculate the overlapping distance between the transmitting coils in real time. With the change of the overlapping distance, the mutual inductance between the transmitting coils also changes. When a certain overlapping distance D is reached, the transmitting coils are decoupled, and the transmission efficiency of the system is improved.

[0048] In some embodiments, the device can further include:

[0049] The magnetic field detection device arranged in the transmitting coil is used for detecting a magnetic field signal of the transmitting coil. The signal conversion module is connected with the magnetic field detection device, and is used for adjusting and converting the magnetic field signal to obtain a digital signal.

[0050] The micro control unit module further calculates the misalignment distance based on the digital signal.

[0051] Specifically, the transmitting coil 1 generates a positioning magnetic field. A plurality of (for example, four) linear Hall sensors can be placed on the transmitting coil 2, and they are used to sense the magnetic field to obtain a measured signal. The measured signal can be converted into digital information (v1-v4) after adjustment, and input into the master control unit MCU. The master control unit MCU performs Kalman filtering on the digital signal, takes the center point of the secondary coil as a coordinate origin, uses a coil positioning algorithm and known coil parameters to calculate the misalignment coordinates of the primary coil relative to the secondary coil in real time, and the misalignment distance can be obtained.

[0052] In some embodiments, the micro control unit module calculates the misalignment distance of the transmitting coil relative to the coordinate origin based on a coil positioning algorithm, and adjusts the transmitting coil to a target size based on the misalignment distance, so as to realize decoupling between the transmitting coils.

[0053] The micro control unit determines the size of the transmitting coil according to different scene requirements to adjust the size of the transmitting coil, so as to realize decoupling between the transmitting coils. If there is cross coupling between the transmitting coils, the decoupling between the transmitting coils can also be realized by adjusting the series capacitance of the LCC compensation network, and the transmission efficiency of the system is improved. The coil positioning algorithm can be realized by arranging a linear Hall sensor array on the uppermost of the three transmitting coils, real-time detecting the gradient magnetic field change generated by the transmitting coil, combining the Kalman filtering algorithm to dynamically estimate the position, using the magnetic field intensity distribution model to construct the state equation, and realizing the millisecond-level real-time solution in the embedded system through multi-sensor data fusion.

[0054] Specifically, as shown in the figure, Figure 1 The microcontroller unit (MCU) 104 can be combined with the non-contact transformer formed by the transmitting end combination coil and the linear Hall sensor to filter out noise and coil positioning. The transmitting end coil generates a positioning magnetic field, and four linear Hall sensors are placed on any two coils of the three transmitting coils to sense the magnetic field. After adjustment, the measured signal is converted into digital information (v1-v4) and input to the main control MCU. The main control MCU filters and processes the digital signal, takes the center point of the combined transmitting coil as the coordinate origin, uses the coil positioning algorithm to calculate the misalignment coordinates of the transmitting end combination coil relative to the coordinate origin in real time, and then determines the size of the transmitting coil in different application scenarios.

[0055] The real-time detection module 105 can realize real-time measurement of various variable parameters inside the transmitting end wireless power transmission coil 103 through 5G, 6G, wifi, Bluetooth, optical fiber, industrial internet, etc. For example, according to the spacing between each transmitting coil, the mutual inductance value between each transmitting coil is measured. In addition, the angle offset working condition between the receiving coil and each transmitting coil is detected in real time, and the mutual inductance value between each transmitting coil and the receiving coil is measured. The measured data is transmitted to the system performance optimization and operation state control module 106 in real time to support the system optimization control function. Among them, the traditional wireless charging is to place two coils in parallel, and the system of the embodiment of the disclosure can be omnidirectional wireless power transmission, so the positions of the original two parallel coils can be defined as the original position, i.e. 0°. When the receiving coil is no longer balanced relative to the transmitting coil, the angle between the coils is the angle offset. The angle offset can be judged by measuring the change of magnetic field intensity or direction (such as Hall effect sensor, magnetic resistance sensor). Since the transmitting coil is composed of multiple (for example, 3) coils, the micro control unit can calculate the spacing between the transmitting coils, and then offset the cross coupling between the transmitting coils to improve the transmission efficiency of the system; the real-time detection module can calculate the mutual inductance value between the receiving coil and the transmitting coil when the receiving coil is at different rotation angles.

[0056] The system performance optimization and operating state regulation module 106 determines the phase difference and phase shift angle of the excitation current of the transmitting coils using the data provided by the micro control unit 104 and the real-time detection module 105. For example, according to the position state of the receiving coils in the positioning system area, the micro control unit 104 calculates the misalignment distance D between the transmitting coils. According to the known misalignment distance D between the transmitting coils, the equivalent self-inductance of each transmitting coil is calculated, and the series variable capacitance switching array real-time control module 107 is controlled to compensate for the equivalent self-inductance of the transmitting coils under different misalignment distances. When the overlap distance between the transmitting coils is different, the mutual inductance between the transmitting coils will change, and the equivalent self-inductance refers to the self-inductance value exhibited by each coil considering the mutual influence (such as mutual inductance) between the coils, so their equivalent inductance is also different. When the coupling coefficient is large, by adding a reactance element (inductance or capacitance) in the loop of the transmitting coil and the receiving coil, the cross-coupling effect is compensated. Specifically, the required reactance value can be calculated according to the equivalent circuit model of the system, and it is connected in series to the corresponding loop. By adjusting the reactance value, the system can still maintain high transmission efficiency and power when the misalignment distance is large. When the coupling coefficient changes little and the horizontal displacement between the receiving coil and the transmitting coil is less than a certain threshold, the cross-coupling effect can be compensated by fine-tuning the current of the transmitting coil.

[0057] In some embodiments, the association information between the coil operating parameters, the phase difference of the excitation current of the transmitting coil, the phase shift angle and the output power of the receiving end corresponding to the wireless power transmission device includes:

[0058]

[0059] wherein P out is the output power of the receiving end, M AR , M BR , M CR is the mutual inductance value of the transmitting coils A, B and C and the receiving coil R, α is the phase difference of the excitation current of the transmitting coil AB, β is the phase difference of the excitation current of the transmitting coil AC, θ i is the phase shift angle of the excitation current of the transmitting coil, U dc is the voltage of the DC voltage source of the transmitting end, R L is the load resistance, R R is the resistance of the receiving coil, L f is the series inductance of the LCC compensation network.

[0060] When the system meets the demand of tuning control, according to the mutual inductance between the transmitting coil and the receiving coil changing with the different rotating working conditions, cooperating with the transmitting end electric energy converter real-time control module 109, the efficient transmission of stable power of the system is realized by adjusting the phase difference α, β of the current between the transmitting coils and the phase shift angle θi. Thus, the dynamic cooperation between the micro control unit 104, the real-time detection module 105, the series variable capacitance switching array real-time control module 107 and the transmitting end electric energy converter real-time control module 109 is realized, the control strategy is adjusted in real time, so that the transmission performance of the system reaches the optimal, and the performance of the whole wireless electric energy transmission system such as transmission efficiency, rated output power, inverter soft switching, output voltage, input power factor and the like is optimized.

[0061] The system parameters can be obtained, for example, the characteristic parameter data of each component of the wireless electric energy transmission system is collected by using voltage, current sensors, electromagnetic field probes, temperature sensors and the like, and the multi-sensor measurement results are comprehensively processed by fusion algorithm. Or, it can be obtained by parameter identification and state estimation.

[0062] It can be seen that the changes of the coil working parameters caused by the position changes between the wireless electric energy transmission transmitting coil and the receiving coil, the changes of the system load, and the parameter drift of the devices caused by heating, aging and the like during the operation of the wireless electric energy transmission system. The system performance optimization and operation state regulation module 106 adjusts and controls the operation state of the whole wireless electric energy transmission system, and realizes the multi-objective comprehensive optimization of the system.

[0063] The transmitting end electric energy converter real-time control module 109 adjusts the control signal of the transmitting end electric energy converter based on the phase difference α, β of the exciting current between the transmitting coils and the phase shift angle θi given by the system performance optimization and operation state regulation module 106, so that the receiving coil can realize the output of stable power without being affected by the rotation angle. Specifically, the transmitting end electric energy converter real-time control module 109 can give the functional relationship between the exciting current phase difference and the coupling mutual inductance between the coils under different working conditions according to the system performance optimization and operation state regulation module 106, and adjust the control signals of the transmitting end electric energy converter 101-1, the transmitting end electric energy converter 101-2 and the transmitting end electric energy converter 101-3 respectively, so that the receiving coil can still meet the design requirement of stable power output under different angle offsets. Specifically, since there are three mutual inductances M AR 、M BR 、M CRIt can be detected that the fitting curve under 360-degree rotation according to the mutual inductance. For example, when the receiving coil is perpendicular to the transmitting coil, when α and β are 120 degrees and 240 degrees, the output power of the system is independent of the rotation angle, and when the fluctuation rate of the equivalent mutual inductance is 3.3%, the phase difference of the inverter can adjust the direction of the spatial magnetic field. When the receiving coil is parallel to the transmitting coil, when α and β are both 0 degrees, the output power of the system is independent of the rotation angle, and the phase difference of the inverter can adjust the direction of the spatial magnetic field. When the receiving coil rotates around the x-axis compared with the transmitting coil, when α and β are 120 degrees and 63 degrees respectively, the output power of the system is independent of the rotation angle, and when the fluctuation rate of the equivalent mutual inductance is 5.5%, the phase difference of the inverter can adjust the direction of the spatial magnetic field.

[0064] In some embodiments, the transmitting side compensation network comprises a variable capacitance array; the apparatus further comprises:

[0065] A variable capacitance control module, connected with the state regulation module and the variable capacitance array, is configured to determine a target capacitance value based on the first mutual inductor, and adjust the variable capacitance array to the target capacitance value, so that the transmitting end compensation network satisfies the resonance condition.

[0066] Specifically, the series variable capacitance switching array real-time control module 107 adjusts the control signal of the variable capacitance based on the equivalent self-inductance of each transmitting coil given by the system performance optimization and operation state regulation module 106 under different misalignment distances, so that the LCC-S compensation network satisfies the resonance condition, so that the transmitting end wireless power transmission compensation network 102-1, the transmitting end wireless power transmission compensation network 102-2 and the transmitting end wireless power transmission compensation network 102-3 of the wireless power transmission system are in resonance, and the power factor of the wireless power transmission system is as close to 1 as possible, the system reactive power loss is reduced, and the transmission efficiency of the system is increased.

[0067] In some embodiments, the apparatus further comprises:

[0068] A variable capacitance measurement module, connected with the variable capacitance array and the state regulation module, is configured to detect the actual capacitance value of the variable capacitance array;

[0069] The variable capacitance control module is further configured to adjust the variable capacitance array to keep the actual capacitance value consistent with the target capacitance value in response to the difference between the actual capacitance value and the target capacitance value being out of a preset range.

[0070] Specifically, the variable capacitance value real-time measurement module 108 detects the values of the compensation network series variable capacitance 102-1, the compensation network series variable capacitance 102-2 and the compensation network series variable capacitance 102-3 in real time, and compares the values with the calculated values in the series variable capacitance real-time control module 108. If the deviation is large, the series variable capacitance switching array real-time control module 108 adjusts again, so that the values of the compensation network series variable capacitance 102-1, the compensation network series variable capacitance 102-2 and the compensation network series variable capacitance 102-3 are as close to the calculated values as possible.

[0071] In some embodiments, the device further comprises a fault protection module connected to at least one of the micro control unit module, the real-time detection module, the state regulation module, the transmitting side converter and the variable capacitance control module, for detecting when at least one of the micro control unit module, the real-time detection module, the state regulation module, the transmitting side converter or the variable capacitance control module fails, and disconnecting the failed module and / or switching to a corresponding redundant module.

[0072] Specifically, the system fault self-checking and tolerance control module 110 self-checks the faults of the entire wireless power transmission system, thereby realizing fault tolerance control. The system faults include but are not limited to: electromagnetic field distribution disorder caused by coil failure, deviation of circuit parameters such as inductance or capacitance caused by aging of compensation elements, circuit topology change caused by compensation network open circuit or short circuit, load failure caused by battery fault state, etc.

[0073] The system fault self-checking and tolerance control module 110 detects the planar combined transmitting coil wireless power transmission system entity, the micro control unit 104, the real-time detection module 105, the system performance optimization and operation state regulation module 106, the transmitting end power converter real-time control module 109 and the series variable capacitance switching array real-time control module 107, to ensure that each module works in a normal state. When a fault occurs, the topology structure of the fault part in the wireless power transmission system can be changed by switching, and / or redundant equipment can be connected to replace the failed equipment.

[0074] It can be seen that the wireless power transmission device based on the adaptive transmitting coil according to the embodiment of the present disclosure adopts the combined transmitting coil structure, can realize the planar wireless power transmission, and improves the compatibility of the system for different application scenarios. A tuning control strategy suitable for the LCC / S compensation network is proposed based on the coil positioning and the series variable capacitance switching array. In the misalignment misalignment condition, the position information of the transmitting end coil is actively used to optimize the system characteristics. According to different application scenarios, the size of the combined transmitting coil can be dynamically adjusted. Based on the excitation current vector control method, the multi-objective comprehensive optimization of the system is realized; when the receiving coil is rotated at any angle, a three-dimensional uniformly distributed rotating magnetic field is realized, and stable power output of the system is ensured. Considering the fault condition, fault self-checking and fault tolerance control are realized to ensure the safe and stable operation of the system.

[0075] It should be understood by those of ordinary skill in the art that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest the scope of the present disclosure (including claims) is limited to these examples; under the idea of the present disclosure, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present disclosure as described above. In order to be brief, they are not provided in detail.

[0076] In addition, in order to simplify the description and discussion, and so as not to make the embodiments of the present disclosure difficult to understand, the well-known power / ground connections of integrated circuit (IC) chips and other components can or can not be shown in the provided drawings. In addition, the devices can be shown in the form of block diagrams in order to avoid making the embodiments of the present disclosure difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented the embodiments of the present disclosure (i.e. these details should be fully within the understanding of those skilled in the art). Where specific details (e.g. circuits) are set forth in order to describe an exemplary embodiment of the present disclosure, it will be apparent to those skilled in the art that the embodiments of the present disclosure can be practiced without these specific details or with variations of these specific details. Therefore, these descriptions should be considered as illustrative rather than limiting.

[0077] Although the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g. dynamic RAM (DRAM)) can use the embodiments discussed.

[0078] Embodiments of the present disclosure are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any one or more of the omitted, modified, equivalently replaced, improved, and the like, as long as within the spirit and principle of the embodiments of the present disclosure, should be included in the scope of protection of the present disclosure.

Claims

1. A wireless power transmitting device based on an adaptive transmitting coil, characterized in that, include: Multiple transmitting modules, each of which includes a transmitting coil, a transmitting-side compensation network, and a transmitting-side converter connected in sequence; A coil detection module, connected to the transmitting coil, is used to detect the coil operating parameters of the transmitting coil; The state control module, connected to the coil detection module, is used to determine the target phase difference and target phase shift angle based on the correlation information between the coil operating parameters, the phase difference and phase shift angle of the excitation current of the transmitting coil and the output power of the corresponding receiving end of the wireless power transmitting device. The transmitter control module, connected to the state adjustment module and the transmitter-side converter, is used to generate a control signal based on the target phase difference and the target phase shift angle to control the output voltage of the transmitter-side converter, so that the output power of the receiver is kept within a preset range.

2. The apparatus according to claim 1, characterized in that, The coil detection module includes: A microcontroller module, connected to the transmitting coil, is used to determine the misalignment distance of the transmitting coil; the misalignment distance is the overlap distance between the transmitting coils. A real-time detection module, connected to the microcontroller module, is used to determine a first mutual inductance value between the transmitting coils based on the misalignment distance; and to detect the angular offset between the receiving coil and the transmitting coil at the receiving end, and to determine a second mutual inductance value between the transmitting coil and the receiving coil based on the angular offset.

3. The apparatus according to claim 2, characterized in that, The transmitter-side compensation network includes a variable capacitor array; the device further includes: A variable capacitor control module, connected to the state control module and the variable capacitor array, is used to determine the target capacitance value based on the value of the first mutual inductor and adjust the variable capacitor array to the target capacitance value so that the transmitter compensation network satisfies the resonance condition.

4. The apparatus according to claim 3, characterized in that, Also includes: A variable capacitance measurement module, connected to the variable capacitor array and the state control module, is used to detect the actual capacitance value of the variable capacitor array. The variable capacitor control module also adjusts the variable capacitor array to make the actual capacitance value consistent with the target capacitance value if the difference between the actual capacitance value and the target capacitance value is not within a preset range.

5. The apparatus according to claim 4, characterized in that, Also includes: The fault protection module is connected to at least one of the microcontroller module, the real-time detection module, the state control module, the transmitter-side converter, and the variable capacitor control module. When a fault occurs in at least one of the microcontroller module, the real-time detection module, the state control module, the transmitter-side converter, or the variable capacitor control module, the faulty module is disconnected and / or switched to the corresponding redundant module.

6. The apparatus according to claim 2, characterized in that, The microcontroller module calculates the misalignment distance of the transmitting coil relative to the origin of the coordinate system based on the coil positioning algorithm, and adjusts the transmitting coil to the target size based on the misalignment distance to achieve decoupling between the transmitting coils.

7. The apparatus according to claim 3, characterized in that, The correlation information between the coil operating parameters, the phase difference of the excitation current of the transmitting coil, the phase shift angle, and the output power of the corresponding receiving end of the wireless power transmitting device includes: ， ， Among them, P out M is the output power of the receiving end. AR M BR M CR Let α be the mutual inductance between transmitting coils A, B, C and receiving coil R, α be the phase difference of the excitation current of transmitting coil AB, β be the phase difference of the excitation current of transmitting coil AC, and θ be the phase difference of the excitation current of transmitting coil AC. i U is the phase shift angle of the excitation current of the transmitting coil. dc R is the voltage of the DC voltage source at the transmitting end. L R is the load resistance. R For the resistance of the receiving coil, L f The series inductance of the LCC compensation network.

8. The apparatus according to claim 6, characterized in that, Also includes: A magnetic field detection device is installed on the transmitting coil to detect the magnetic field signal of the transmitting coil; A signal conversion module, connected to the magnetic field detection device, is used to adjust and convert the magnetic field signal to obtain a digital signal; The microcontroller module also calculates the misalignment distance based on the digital signal.

9. A wireless power transfer system based on an adaptive transmitting coil, characterized in that, include: The wireless power transmitting device based on an adaptive transmitting coil as described in any one of claims 1-8; And a wireless power receiving device for receiving electrical energy transmitted from the wireless power transmitting device and providing it to the load.

10. The system according to claim 9, characterized in that, The wireless power receiving device includes: A receiving coil is used to receive electrical signals emitted by the wireless power transmitting device; A receiving-side compensation network, connected to the receiving coil, is used to compensate for the electrical energy to offset noise and loss during transmission. A receiver-side converter, connected to the receiver-side compensation network, is used to convert the electrical energy signal and provide it to the load.

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