Wireless electric energy transmission device and transmission system based on adaptive transmitting coil

Abstract

The invention provides a wireless electric energy transmitting device and transmission system based on a self-adaptive transmitting coil, and the device comprises a plurality of transmitting modules, and each transmitting module comprises a transmitting coil, a transmitting side compensation network, and a transmitting side converter, which are connected in sequence. The coil detection module is connected with the transmitting coil and is used for detecting coil working parameters of the transmitting coil; the state regulation and control module is connected with the coil detection module and is used for determining a target phase difference and a target phase shift angle based on the coil working parameters, the phase difference of the exciting current of the transmitting coil, the phase shift angle and correlation information of the output power of a receiving end corresponding to the wireless electric energy transmitting device; and the transmitting end control module is connected with the state regulation and control module and the transmitting side converter, and is used for generating a control signal based on the target phase difference and the target phase shift angle so as to control the output voltage of the transmitting side converter, so that the output power of the receiving end is kept in a preset range.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless power transmission, and particularly to a wireless power transmission device and a transmission system based on an adaptive transmitting coil. Background Art

[0002] Existing wireless power transmission technologies have low transmission power and efficiency, and also have large occupied space and high cost. Summary of the Invention

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

[0004] In a first aspect of the present disclosure, there is provided a wireless power transmitting device based on an adaptive transmitting coil, including:

[0005] A plurality of transmitting modules, each of the transmitting modules including a transmitting coil, a transmitting-side compensation network, and a transmitting-side converter connected in sequence;

[0006] A coil detection module connected to the transmitting coil for detecting the coil operating parameters of the transmitting coil;

[0007] A state regulation module connected to the coil detection module for determining a target phase difference and a target phase shift angle based on 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 transmitting device;

[0008] A transmitting-end control module connected to 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 maintained within a preset range.

[0009] In a second aspect of the present disclosure, there is provided a wireless power transmission system based on an adaptive transmitting coil, including:

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

[0011] And a wireless power receiving device for receiving the electric energy transmitted by the wireless power transmitting device and providing it to a load.

[0012] As can be seen from the above, a wireless power transmission device and a transmission system based on an adaptive transmitting coil provided by the present disclosure adopt multiple transmitting modules, each of which is equipped with a transmitting coil, a compensation network, and a converter, and the operating parameters of the transmitting coil are monitored in real time by a coil detection module. The state regulation module determines the target phase difference and the target phase shift angle based on these parameters, the phase difference of the exciting current, and the correlation information between the phase shift angle and the output power of the receiving end. Subsequently, the transmitting end control module generates a control signal based on the target phase difference and the target phase shift angle to accurately adjust the output voltage of the transmitting side converter. This effectively improves the stability and efficiency of the wireless energy transmission system, realizes omnidirectional wireless power transmission of an adaptive rotating coil, and improves the compatibility of the system for different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic diagram of a wireless power transmission system based on an adaptive transmitting coil according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to make the objectives, technical solutions, and advantages of the present disclosure more clearly understood, the following further details the present disclosure in conjunction with specific embodiments and with reference to 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 have the ordinary meanings understood by those of ordinary skill in the art in the field to which the present disclosure belongs. The "first", "second", and similar terms used in the embodiments of the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0017] With the development of wireless power transmission technology and the continuous expansion of application scenarios, there has gradually emerged a need for wireless charging that extends from the traditional fixed alignment charging mode to all directions, a wide range, and high degrees of freedom. For example, in the process of realizing dynamic wireless charging for smart homes, etc., to provide convenient wireless charging, higher requirements are put forward for the degrees of freedom of wireless power transmission, and even if a mobile phone is placed randomly, it can be easily charged. At the same time, the size and area of the charging device vary due to different scenarios, which in turn affects the system coupling situation. However, in related technologies, when using a spatial three-dimensional omnidirectional wireless power transmission, it occupies a relatively large space volume and has a relatively high application cost, making it difficult to popularize. When using a combined transmitting coil structure, the influence of the mutual inductance between individual transmitting coils on the self-inductance of the present transmitting coil needs to be considered. These have brought great difficulties to the research and development and upgrading of omnidirectional wireless charging equipment. Therefore, how to improve the transmission power and transmission efficiency of wireless power transmission, reduce the occupied space, lower the cost, and meet the application requirements of various scenarios has become a technical problem that urgently needs to be solved.

[0018] In view of this, the present disclosure provides a wireless power transmitting device and a transmission system based on an adaptive transmitting coil according to an embodiment of the present disclosure. By adopting a plurality of transmitting modules, each module is equipped with a transmitting coil, a compensation network, and a converter, and the working parameters of the transmitting coil are monitored in real time through a coil detection module. The state regulation module determines the target phase difference and the target phase shift angle based on these parameters, the phase difference of the exciting current, and the correlation information between the phase shift angle and the output power of the receiving end. Subsequently, the transmitting end control module generates a control signal based on the target phase difference and the target phase shift angle to accurately adjust the output voltage of the transmitting side converter. 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 with different application scenarios is improved.

[0019] See Figure 1 , Figure 1 shows a schematic diagram of a wireless power transmission system based on an adaptive transmitting coil according to an embodiment of the present disclosure. Figure 1 In

[0020] a wireless power transmission system based on an adaptive transmitting coil may include:

[0021] a wireless power transmitting device based on an adaptive transmitting coil;

[0022] And a wireless power receiving device for receiving the electric energy transmitted from the wireless power transmitting device and supplying it to a load. Figure 1As shown, the wireless power transmission device based on the adaptive transmitting coil may include a plurality of transmitting devices, and the transmitting coils of each transmitting device are arranged coaxially. Each transmitting coil adopts a separate LCC compensation network, and the series inductance and parallel capacitance in the compensation network may both be of the same value, and the series capacitance may adopt a variable capacitance. Different transmitting devices may use the same DC power supply or separately use individual DC power supplies to provide energy. The wireless power receiving device may adopt an S compensation network topology structure, mainly composed of a receiving coil, a series compensation capacitor, and a load.

[0023] The wireless power transmission system based on the adaptive transmitting coil according to the embodiments of the present disclosure may adopt an LCC-S compensation network. This LCC-S compensation network utilizes the principle of magnetic coupling resonance and realizes wireless power transmission by adjusting the circuit parameters at the transmitting end and the receiving end. "LCC" may refer to the combination of an inductor (L), a capacitor (C), and another capacitor (C) to form a resonant circuit; "S" may refer to the series compensation network on the receiving side. The LCC compensation network connected to the transmitting coil in the coaxial multi-transmitting coil wireless power transmission system satisfies the resonant condition during operation.

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

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

[0026] A receiving-side compensation network connected to the receiving coil for compensating the electric energy to offset the noise and loss during the transmission process;

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

[0028] Specifically, the electric energy receiving device may include an S compensation topology and a rectifier, and the receiving end may adopt coils of any structure, including coils of types such as circular, square, and polygonal.

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

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

[0031] Specifically, such as Figure 1As shown, the power conversion device 101 at the transmitting end, the wireless power transmission compensation network 102 at the transmitting end, and the wireless power transmission coil 103 at the transmitting end can be analyzed and controlled. The spacing of the wireless power transmission coil 102 at the transmitting end and the angular offset of the wireless power transmission coil at the receiving end both affect the system parameters. Through the microcontroller unit 104 and the real-time detection module 105, the internal parameters of the wireless power transmission coil 103 at the transmitting end are calculated in real time to determine the misalignment distance between the transmitting coils and the real-time measurement of the mutual inductance parameter between the wireless power transmission coil 103 at the transmitting end and the wireless power transmission coil at the receiving end. The microcontroller unit module 104 is combined with a linear Hall sensor, and the main control unit MCU calculates different misalignment distances D and sends a control signal to the capacitor switching array according to the tuning stage it is in, controlling the on / off of the relay and the switching of the capacitor to complete the tuning control process of the positioning system. 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 rotation conditions can include three types: the receiving coil rotates around the x-axis relative to the transmitting coil, the receiving coil rotates around the y-axis relative to the transmitting coil, and the receiving coil rotates around the z-axis relative to the transmitting coil. In different rotation cases, the corresponding α and β are different, that is, the phase difference of the excitation current is also different, and control is carried out by adjusting different α and β.

[0032] Through the system performance optimization and operation state regulation module 106, the real-time control module 107 of the series variable capacitor switching array and the real-time control module 109 of the power converter at the transmitting end are adjusted simultaneously to achieve comprehensive system optimization. The variable capacitor switching array real-time measurement module 108 performs real-time measurement. When the relay S0 is connected to the upper contact, the system can achieve 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 capacitance value compares the measured value with the capacitance value given by the system performance optimization and operation state regulation module 105 to make the variable capacitance values of each transmitting coil compensation network as close as possible to the calculated value, realizing decoupling of the transmitting coils. Through the system fault self-check and tolerance control module 110, faults of the microcontroller unit module 104, the real-time detection module 105, the system performance optimization and operation state regulation module 106, the real-time control module 107 of the series variable capacitor switching array, and the real-time control module 109 of the power converter at the transmitting end are detected. If a fault or a fault trend is found, corresponding fault tolerance control methods are adopted.

[0033] According to an embodiment of the present disclosure, a wireless power transmitting device based on an adaptive transmitting coil may include:

[0034] a plurality of transmitting modules, each of the transmitting modules including a transmitting coil, a transmitting-side compensation network, and a transmitting-side converter connected in sequence;

[0035] A coil detection module, connected to the transmitting coil, for detecting the coil operating parameters of the transmitting coil;

[0036] A state regulation module, connected to 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;

[0037] A transmitting end control module, connected to 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 maintained within a preset range.

[0038] Figure 1 Among them, the wireless power transmission system based on an adaptive transmitting coil includes: a power supply, a transmitting end power 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 power conversion device, and a load. The transmitting end power conversion device 101 includes a transmitting end power converter 101-1, a transmitting end power converter 101-2... a transmitting end power converter 101-n. The transmitting side compensation network 102 includes a series variable capacitor switching array 102-1, a series variable capacitor switching array 102-2... a series variable capacitor switching array 102-n; among them, the variable capacitor switching array can be composed of a parallel connection of a variable capacitor and a capacitor switching array (a plurality of capacitors C1, C2,... Cn 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... a wireless power transmission coil 103-n. It should be understood that n can be designed and selected according to different application conditions and is not limited here.

[0039] The wireless power transmission system based on an adaptive transmitting coil adopts an LCC-S compensation network. According to the characteristics of the LCC-S compensation network, the series inductance and parallel capacitance of each transmitting coil can adopt the same value, and the series inductance and parallel capacitance are ensured to resonate. Due to the cross-coupling between coils in the planar combined transmitting coil structure, the equivalent self-inductance of each transmitting coil is related to the coupling mutual inductance between them. Therefore, 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 series variable capacitor after switching is regarded as a variable at different misalignment distances D.

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

[0041] The transmitting-end compensation network 102 adopts an LCC compensation network topology, including 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 variable capacitor that can be real-time controlled in parallel with a capacitor switching array. The transmitting-end compensation network 102 can compensate for the load impedance of the power conversion device 101 at the transmitting end to adjust performance indicators such as the power, efficiency, and soft switching of the wireless power transmission system. The receiving-end compensation network can adopt a compensation network topology to compensate for the system load impedance of the receiving-end power conversion device and the load as a whole to adjust performance indicators such as the power, efficiency, and soft switching of the wireless power transmission system. The high-frequency AC power output by the power conversion device 101 at the transmitting end, after being compensated by the transmitting-end compensation network, 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 3 transmitting coils that are exactly the same in size and shape. The distance between the transmitting coils and the current passing through each transmitting coil are both variable.

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

[0043] The mutual inductance between the transmitting coil and the receiving coil is affected by the angular offset between the transmitting coil and the receiving coil. The change in the misalignment distance between the transmitting coils will affect the mutual inductance between the transmitting coils. The change in the mutual inductance between the transmitting coil and the receiving coil and the change in the load will both cause changes in the control parameters.

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

[0045] A micro-control unit module, connected to the transmitting coil, for determining the misalignment distance of the transmitting coil;

[0046] A real-time detection module, connected to the micro-control unit module, is configured to determine a first mutual inductance value between the transmitting coils based on the misalignment distance; and to detect an angular offset between the receiving coil at the receiving end and the transmitting coils, and determine a second mutual inductance value between the transmitting coils and the receiving coil based on the angular offset.

[0047] Wherein, the misalignment distance may refer to the overlapping distance between the transmitting coils. The micro-control unit 104 performs Kalman filtering on the digital signal according to the main control MCU. Taking the center point of the secondary coil as the coordinate origin, the overlapping distance between the transmitting coils is calculated in real time using the coil positioning algorithm and known coil parameters. As the overlapping distance changes, the mutual inductance between the transmitting coils also changes. When a certain overlapping distance D is reached, decoupling occurs between the transmitting coils, improving the transmission efficiency of the system.

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

[0049] A magnetic field detection device disposed on the transmitting coil for detecting a magnetic field signal of the transmitting coil; a signal conversion module, connected to the magnetic field detection device, 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. Multiple (e.g., 4) linear Hall sensors can be placed on the transmitting coil 2, and they are used to sense the magnetic field to obtain the measured signal. After the measured signal is adjusted, it can be converted into digital information (v1 - v4) and input into the main control unit MCU. The main control unit MCU performs Kalman filtering on the digital signal. Taking the center point of the secondary coil as the coordinate origin, the misalignment coordinates of the primary coil relative to the secondary coil are calculated in real time using the coil positioning algorithm and known coil parameters, 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 the coil positioning algorithm, and adjusts the transmitting coil to a target size based on the misalignment distance to achieve decoupling between the transmitting coils.

[0053] Among them, the microcontroller unit determines the size of the transmitting coil according to different scenario requirements to adjust the size of the transmitting coil to achieve decoupling between the transmitting coils. If there is cross-coupling between the transmitting coils, decoupling between the transmitting coils can also be achieved by adjusting the series capacitance of the LCC compensation network, improving the transmission efficiency of the system. The coil positioning algorithm can arrange a linear Hall sensor array above the uppermost of the three transmitting coils to detect the change in the gradient magnetic field generated by the transmitting coils in real time, combine the Kalman filtering algorithm to dynamically estimate the position, construct a state equation using the magnetic field intensity distribution model, and achieve millisecond-level real-time calculation in the embedded system through multi-sensor data fusion.

[0054] Specifically, as Figure 1 shown, the microcontroller unit (MCU) 104 can be combined with the non-contact transformer formed by the transmitting end combined coil and the linear Hall sensor for noise filtering and coil positioning. The transmitting end coil generates a positioning magnetic field, and 4 linear Hall sensors are placed on any two coils among the three transmitting coils to sense the magnetic field. After being adjusted, the measured signal is converted into digital information (v1 - v4) and input into the main control MCU. The main control MCU filters the digital signal, takes the center point of the combined transmitting coil as the coordinate origin, and uses the coil positioning algorithm to calculate the misalignment coordinates of the transmitting end combined coil relative to the coordinate origin in real time, thereby determining the size of the transmitting coil in different application scenarios.

[0055] The real-time detection module 105 can achieve real-time measurement of various variable parameters inside the wireless power transmission coil 103 at the transmitting end through means such as 5G, 6G, wifi, Bluetooth, optical fiber, and industrial Internet. For example, according to the distance between each transmitting coil, the mutual inductance value between each transmitting coil is measured. Also, the angular offset condition between the receiving coil and each transmitting coil is detected in real time, and then the mutual inductance value between each transmitting coil and the receiving coil is measured. And the measured data is transmitted to the system performance optimization and operation state regulation module 106 in real time to support the system optimization control function. Among them, in traditional wireless charging, two coils are placed parallel. The system of the embodiment of the present disclosure can perform omnidirectional wireless power transmission. Therefore, the positions of the original two parallel coils can be defined as the original position, that is, 0°. When the receiving coil is no longer balanced relative to the transmitting coil, the angle of inclination between the coils is the angle offset. The angle offset can be judged by measuring the change in magnetic field intensity or direction (such as Hall effect sensors, magnetoresistive sensors). Since the transmitting coil is composed of multiple (for example, 3) coils combined, the microcontroller unit can calculate the distance between the transmitting coils, thereby canceling the cross-coupling between the transmitting coils and improving the system transmission efficiency; 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 coil by using the data provided by the microcontroller unit 104 and the real-time detection module 105. For example, according to the position state of the receiving coil within the positioning system area, the microcontroller unit 104 calculates the misalignment distance D between the transmitting coils. Based on the known misalignment distance D between the transmitting coils, the equivalent self-inductance of each transmitting coil is calculated, and the series variable capacitor switching array real-time control module 107 is controlled to compensate for the equivalent self-inductance of the transmitting coil under different misalignment distances. Among them, when the overlapping distances between the transmitting coils are different, the mutual inductance between the transmitting coils will change. 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. Therefore, their equivalent inductances are also different. When the coupling coefficient is large, reactance elements (inductors or capacitors) are added to the circuits of the transmitting coil and the receiving coil to compensate for the cross-coupling effect. Specifically, according to the equivalent circuit model of the system, the reactance value to be compensated can be calculated and connected in series to the corresponding circuit. By adjusting the reactance value, the system can still maintain a high transmission efficiency and power when the misalignment distance is large. When the change in the coupling coefficient is small 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 finely adjusting the current of the transmitting coil.

[0057] In some embodiments, the association 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 receiving end corresponding to the wireless power transmission device includes:

[0058]

[0059] Where P out is the output power of the receiving end, M AR , M BR , M CR are the mutual inductance values between the transmitting coils A, B, C and the receiving coil R, α is the phase difference of the excitation current of the transmitting coils AB, β is the phase difference of the excitation current of the transmitting coils 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 at the transmitting end, R L is the load resistance, R R is the resistance of the receiving coil, and L f is the series inductor of the LCC compensation network.

[0060] When the system meets the requirements of tuning control, according to the change of the mutual inductance between the transmitting coil and the receiving coil under different rotation conditions, it cooperates with the real-time control module 109 of the transmitting-end power converter, and realizes the efficient transmission of stable power in the system by adjusting the current phase differences α, β between the transmitting coils and the phase-shifting angle θi. Thus, the dynamic cooperation among the micro control unit 104, the real-time detection module 105, the real-time control module 107 of the series variable capacitor switching array, and the real-time control module 109 of the transmitting-end power converter is realized, and the control strategy is adjusted in real time, so that the transmission performance of the system reaches the optimal, and the performance of the entire wireless power transmission system such as transmission efficiency, rated output power, inverter soft switching, output voltage, input power factor, etc. is optimized.

[0061] System parameters can be obtained. For example, by using voltage and current sensors, electromagnetic field probes, temperature sensors, etc., the characteristic parameter data of each component of the wireless power transmission system are collected, and the measurement results of multiple sensors are comprehensively processed through a fusion algorithm. Or, it can be obtained through parameter identification and state estimation.

[0062] It can be seen that during the operation of the wireless power transmission system, the position change between the wireless power transmission transmitting coil and the receiving coil, the change of the system load, and the change of the coil working parameters caused by device parameter drift due to reasons such as heating and aging. The system performance optimization and operation state regulation module 106 adjusts and controls the operation state of the entire wireless power transmission system to achieve the multi-objective comprehensive optimization of the system.

[0063] Based on the phase differences α, β between the exciting currents between the transmitting coils and the phase-shifting angle θi given by the system performance optimization and operation state regulation module 106, the real-time control module 109 of the transmitting-end power converter adjusts the control signal of the transmitting-end power converter, so that the receiving coil can achieve stable power output without being affected by the rotation angle. Specifically, the real-time control module 109 of the transmitting-end power converter can, according to the system performance optimization and operation state regulation module 106, give the functional relationship between the exciting current phase difference and the coupling mutual inductance between the coils under different working conditions, and respectively adjust the control signals of the transmitting-end power converters 101-1, 101-2, and 101-3 of the transmitting-end, so that the receiving coil can still meet the design requirements of the system for stable power output under different angular offsets. Specifically, due to the three mutual inductances M AR 、M BR 、M CRIt can be detected that the fitting curve of the mutual inductance under 360-degree rotation. For example, when the receiving coil is perpendicular to the transmitting coil, when α and β are 120 degrees and 240 degrees respectively, the output power of the system is independent of the rotation angle. When the volatility 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 relative to 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. When the volatility 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 includes a variable capacitor array; the device further includes:

[0065] A variable capacitor control module, connected to the state regulation module and the variable capacitor array, for determining a target capacitance value based on the first mutual inductor and adjusting the variable capacitor array to the target capacitance value so that the transmitting-end compensation network satisfies the resonance condition.

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

[0067] In some embodiments, the device further includes:

[0068] A variable capacitor measurement module, connected to the variable capacitor array and the state regulation module, for detecting the actual capacitance value of the variable capacitor array;

[0069] The variable capacitor control module also responds when the difference between the actual capacitance value and the target capacitance value is not within the preset range, and adjusts the variable capacitor array so that the actual capacitance value is consistent with the target capacitance value.

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

[0071] In some embodiments, the device further includes: 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 transmitter-side converter, and the variable capacitor control module, and configured to disconnect the faulty module and / or switch to the corresponding redundant module when detecting that at least one of the micro-control unit module, the real-time detection module, the state regulation module, the transmitter-side converter, or the variable capacitor control module fails.

[0072] Specifically, the system fault self-check and tolerance control module 110 performs self-check on the faults of the entire wireless power transmission system, and thus realizes fault tolerance control; system faults include but are not limited to: the electromagnetic field distribution disorder caused by coil faults, the deviation of circuit parameters such as inductance or capacitance caused by the aging of compensation components, the change of circuit topology caused by the open circuit or short circuit of the compensation network, and the load fault caused by the battery fault state, etc.

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

[0074] It can be seen that the wireless power transmission device based on an adaptive transmitting coil according to an embodiment of the present disclosure adopts a combined transmitting coil structure, which can achieve planar wireless power transmission and improve the compatibility of the system for different application scenarios. A tuning control strategy suitable for an LCC / S compensation network is proposed based on coil positioning and a series variable capacitor switching array. Under the misalignment and detuning conditions, the position information of the transmitting coil at the transmitting end is actively utilized 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, multi-objective comprehensive optimization of the system is achieved; when the receiving coil rotates at any angle, a three-dimensional uniformly distributed rotating magnetic field is achieved to ensure that the system can output stable power. Considering the fault situation, fault self-check and fault tolerance control are realized to ensure the safe and stable operation of the system.

[0075] Those of ordinary skill in the art should understand that: The discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; Under the idea of the present disclosure, the technical features between the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present disclosure as described above. For the sake of brevity, they are not provided in detail.

[0076] In addition, to simplify the description and discussion, and so as not to make the embodiments of the present disclosure difficult to understand, the known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. In addition, the device may be shown in block diagram form 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 on which the embodiments of the present disclosure are to be implemented (i.e., these details should be fully within the understanding of those skilled in the art). In the case where specific details (such as circuits) are set forth to describe the exemplary embodiments of the present disclosure, it will be apparent to those skilled in the art that the embodiments of the present disclosure can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0077] Although the present disclosure has been described in conjunction with specific embodiments of the present disclosure, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. For example, other memory architectures (such as dynamic RAM (DRAM)) can be used with the embodiments discussed.

[0078] Embodiments of the present disclosure are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A wireless power transmitting device based on an adaptive transmitting coil, characterized in that: include: 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; A coil detection module, connected to the transmitting coil, and used to detect coil operating parameters of the transmitting coil; A state control module, connected to the coil detection module, for determining a target phase difference and a target phase shift angle based on 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 transmitting device; The transmitting end control module is connected to the state control module and the transmitting side converter, and 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 transmitting side converter so that the output power of the receiving end is maintained within a preset range.

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

3. The device according to claim 2, characterized in that The transmitting side compensation network includes a variable capacitor array; the device also includes: A variable capacitance control module is connected to the state control module and the variable capacitance array, and is used 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 transmitter compensation network meets the resonance condition.

4. The device according to claim 3, characterized in that Also includes: A variable capacitance measuring module, connected to the variable capacitance array and the state control module, and used to detect an actual capacitance value of the variable capacitance array; The variable capacitance control module further adjusts the variable capacitance array so that the actual capacitance value is consistent with the target capacitance value in response to the difference between the actual capacitance value and the target capacitance value not being within a preset range.

5. The device according to claim 2, characterized in that Also includes: A fault protection module is 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, and is used to disconnect the faulty module and / or switch to the corresponding redundant module when detecting a fault in 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.

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

7. The device according to claim 3, characterized in that The information on the association between the coil working parameters, the phase difference and the phase shift angle of the excitation current of the transmitting coil and the output power of the receiving end corresponding to the wireless power transmitting device, include: Among them, P out is the output power of the receiving end, M AR 、M BR 、M CR is the mutual inductance of the transmitting coils A, B, 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 exciting current of the transmitting coil, U dc is the voltage of the DC voltage source at the transmitting end, R L is the load resistance, R R is the receiving coil resistance, L f is the series inductance of the LCC compensation network.

8. The device according to claim 6, characterized in that Also includes: A magnetic field detection device provided on the transmitting coil, used to detect the magnetic field signal of the transmitting coil; A signal conversion module, connected to the magnetic field detection device, for adjusting and converting the magnetic field signal to obtain a digital signal; The micro control unit module also calculates the misalignment distance based on the digital signal.

9. A wireless power transmission system based on an adaptive transmitting coil, characterized in that: include: A wireless power transmitting device based on an adaptive transmitting coil as claimed in any one of claims 1 to 8; and a wireless power receiving device, used for receiving the electric energy sent by the wireless power transmitting device and providing the electric energy to the load.

10. The system according to claim 9, characterized in that The wireless power receiving device comprises: A receiving coil, used for receiving the electric energy signal transmitted from the wireless energy transmitting device; A receiving side compensation network, connected to the receiving coil, for compensating the electric energy to offset the noise and loss in the transmission process; The receiving-side converter is connected to the receiving-side compensation network and is used for converting the electric energy signal and providing it to the load.

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