Energy transmission optimization method and system of omnidirectional wireless power transmission system, electronic equipment and storage medium

Abstract

The invention provides an energy transmission optimization method and system of an omnidirectional wireless power transmission system, electronic equipment and a storage medium. An equivalent circuit model is obtained according to an LCC-S compensation structure. And according to the equivalent circuit model, a current parameterization model used for solving current parameters is established. And then, according to the current parameterization model, current parameters of the transmitting end and the receiving end of the equivalent circuit model are obtained, and then according to the current parameters, the efficiency parameters of the inverter are further solved. At the moment, whether the LCC-S compensation structure needs to be subjected to energy transfer optimization or not is judged according to the value judgment of an efficiency parameter, whether the efficiency parameter is the maximum value or not is judged, and if the efficiency parameter is not the maximum value, three mutual inductance parameters of the three transmitting coils to the receiving coil in the equivalent circuit model are obtained respectively; and obtaining an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter. And further performing energy transfer optimization on the LCC-S compensation structure according to the optimal phase shift angle.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and in particular to an energy transmission optimization method, system, electronic device and storage medium for an omnidirectional wireless power transmission system. Background Art

[0002] Currently, in existing technologies, wireless power transmission technology, because it breaks free from the constraints of wires, is ideal for supplying power to mobile electrical devices. However, for such applications, positional offset or angular rotation between the transmitting and receiving coils is inevitable. However, traditional wireless power transmission technology generally only allows for unidirectional energy transmission and has poor resistance to positional offset or angular rotation. To address this problem, omnidirectional wireless power transmission technology has emerged. This technology is a new type of technology that can use electrical devices to transmit wireless power at any position and angle within a certain spatial area. It can effectively overcome the shortcomings of traditional wireless power transmission technology, such as weak anti-offset capability and a single transmission angle, and has good position and angle adaptability.

[0003] The coupling mechanism is a key component in achieving omnidirectional wireless energy transmission. Most omnidirectional wireless power transmission systems utilize a multi-transmitter, single-receiver coupling mechanism, requiring the transmitter to possess three-dimensional, omnidirectional magnetic energy transmission capabilities. Currently, transmitters with this capability include structures such as three orthogonal coils, bowl coils, meshed planar coils, and composite planar coils. These transmitters are composed of multiple transmitting coils. If the same current is excited in multiple transmitting coils, the resulting composite magnetic field will have a fixed direction, preventing omnidirectional wireless energy transmission. Therefore, a reasonable method for controlling the magnetic field direction is essential for achieving omnidirectional wireless energy transmission. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides an energy transmission optimization method for an omnidirectional wireless power transmission system.

[0006] In view of this, a first aspect of the present invention provides an energy transmission optimization method for an omnidirectional wireless power transmission system, comprising: Based on the LCC-S compensation structure, an equivalent circuit model is obtained; Based on the equivalent circuit model, a current parameterization model is established; Based on the current parameterized model, obtaining current parameters of the transmitting end and the receiving end of the equivalent circuit model; Based on the current parameters, the efficiency parameters of the inverter are obtained; Determining whether the efficiency parameter is a maximum value; if the efficiency parameter is not a maximum value, respectively obtaining three mutual inductance parameters of the three transmitting coils with respect to the receiving coil in the equivalent circuit model; and obtaining an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter; Based on the optimal phase shift angle, energy transfer of the LCC-S compensation structure is optimized.

[0007] Furthermore, establishing a current parameterized model based on the equivalent circuit model includes: Based on the equivalent circuit model, obtaining voltage parameters, inductance parameters, capacitance parameters and resistance parameters; The equivalent circuit model establishes Kirchhoff voltage models of the transmitting end and the receiving end according to the fundamental wave analysis method; Based on the Kirchhoff voltage model, the current parameterization model is established.

[0008] Furthermore, the obtaining of current parameters of the transmitting end and the receiving end of the equivalent circuit model based on the current parameterized model includes: Substituting the resonant compensation inductance and phase shift angle in the equivalent circuit model into the current parameterized model to obtain the primary coil excitation current in the equivalent circuit model; The mutual inductance and the resonant compensation inductance in the equivalent circuit model are substituted into the current parameterization model to obtain the secondary side receiving coil current and the full-bridge inverter current in the equivalent circuit model respectively.

[0009] Furthermore, obtaining the efficiency parameter of the inverter based on the current parameter includes: Obtaining the output power of the LCC-S compensation structure based on the load resistance of the secondary side and the receiving coil current in the equivalent circuit model; Based on the output power, an output efficiency is obtained.

[0010] Furthermore, respectively obtaining three mutual inductance parameters of the three transmitting coils to the receiving coil in the equivalent circuit model, and obtaining the optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter, includes: Obtain the system parameters of the LCC-S compensation structure; Detect and record the system DC input current Idci when a single inverter is working, and obtain the three mutual inductance values ​​of the three transmitting coils to the receiving coil in the equivalent circuit model; The mutual inductance value with the largest absolute value among the three mutual inductance values ​​is selected, the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​is used as a reference value, and the signs of the three mutual inductance values ​​are determined based on the combined excitation method; The phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​is set to 180°. Based on the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values, the remaining two phase shift angles at maximum efficiency are obtained as the optimal phase shift angles.

[0011] Furthermore, the energy transfer optimization of the LCC-S compensation structure based on the optimal phase shift angle includes: Monitor whether the change of the system DC input current Idci exceeds the change threshold. If the change of the system DC input current Idci exceeds the change threshold, re-obtain the optimal phase shift angle. Otherwise, the current phase shift angle is determined to be the optimal phase shift angle; Detect whether the LCC-S compensation structure needs to stop working. If the LCC-S compensation structure needs to stop working, then end. Otherwise, it is monitored again whether the LCC-S compensation structure needs to stop working.

[0012] Furthermore, the system parameters include: DC input voltage Udc, operating angular frequency ω, compensation inductance Lf, transmitting coil internal resistance Ri, receiving coil internal resistance Rs and load resistance RL.

[0013] In a second aspect, the present invention discloses an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0014] In a third aspect, the present invention discloses a computer-readable storage medium storing a computer program executable by an electronic device, which enables the electronic device to execute the steps of the above method when the computer program runs on the electronic device.

[0015] In a fourth aspect, the present invention discloses an energy transmission optimization system for an omnidirectional wireless power transmission system, comprising: Equivalent circuit model building module, based on the LCC-S compensation structure, obtains the equivalent circuit model; A current parameterized model building module is used to build a current parameterized model based on the equivalent circuit model; A current parameter acquisition module, which acquires current parameters of a transmitting end and a receiving end of an equivalent circuit model based on the current parameterization model; An efficiency parameter acquisition module obtains the efficiency parameters of the inverter based on the current parameters; an optimal phase shift angle acquisition module, configured to determine whether the efficiency parameter is a maximum value; if the efficiency parameter is not a maximum value, respectively acquire three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model; and acquire an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter; An energy transfer optimization module performs energy transfer optimization on the LCC-S compensation structure based on the optimal phase shift angle.

[0016] By adopting the above technical solution, an equivalent circuit model and a current parameterization model are constructed to accurately obtain the current parameters and inverter efficiency of the transmitter and receiver. The mutual inductance parameters and efficiency parameters are used to dynamically determine the optimal phase shift angle, thereby realizing adaptive energy transmission optimization of the omnidirectional wireless power transmission system, effectively improving the energy transmission efficiency and system stability, and overcoming the efficiency reduction problem caused by position offset or angle rotation in traditional methods. At the same time, there is no need to directly detect the posture of the receiver or additional communication modules, which significantly reduces the system complexity and cost, and enhances the practicality and reliability of the omnidirectional wireless power transmission technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 Flowchart of a method for optimizing energy transmission in an omnidirectional wireless energy transmission system according to an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of an LCC-S compensation structure according to an embodiment of the present invention.

[0019] Figure 3 is an equivalent circuit model according to one embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0022] Refer to the following Figure 1 The following describes an energy transmission optimization method for an omnidirectional wireless power transmission system according to some embodiments of the present invention.

[0023] like Figure 1 As shown, the first aspect of the present invention provides an energy transmission optimization method for an omnidirectional wireless power transmission system, comprising: Step 101: Obtain an equivalent circuit model based on the LCC-S compensation structure; Step 102: establishing a current parameterized model based on the equivalent circuit model; Step 103: obtaining current parameters of the transmitting end and the receiving end of the equivalent circuit model based on the current parameterized model; Step 104: Obtaining an efficiency parameter of the inverter based on the current parameter; Step 105: Determine whether the efficiency parameter is a maximum value. If the efficiency parameter is not a maximum value, obtain three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model, and obtain the optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter. Step 106: Optimize the energy transfer of the LCC-S compensation structure based on the optimal phase shift angle.

[0024] The present invention proposes an energy transmission optimization method for an omnidirectional wireless power transmission system. First, Figure 2 As shown, this is a schematic diagram of the LCC-S compensation structure. According to the LCC-S compensation structure, Figure 3 The equivalent circuit model shown in FIG. Based on the equivalent circuit model, a current parameterization model for obtaining current parameters is established.

[0025] Then, according to the current parameterization model, the current parameters of the transmitting end and the receiving end of the equivalent circuit model are obtained, and then the efficiency parameters of the inverter are further obtained based on the current parameters.

[0026] At this point, the need for energy transfer optimization in the LCC-S compensation structure is determined by the value of the efficiency parameter to determine whether it is at its maximum value. If not, the three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model are obtained. Based on these three mutual inductance parameters and the efficiency parameter, the optimal phase shift angle is determined. Based on this optimal phase shift angle, the LCC-S compensation structure is then optimized for energy transfer.

[0027] The proposed energy transfer optimization method for an omnidirectional wireless power transmission system ensures that the coupling mechanism always operates at maximum efficiency. This method eliminates the need for direct detection of the receiving coil's position and communication, resulting in an energy transfer efficiency at least 10% higher than traditional rotational methods. This method further enriches the theoretical framework of omnidirectional WPT systems and provides theoretical guidance and engineering references for promoting the industrialization and commercialization of omnidirectional WPT technology in areas such as consumer electronics, smart homes, implantable medical devices, and wireless sensors for the Internet of Things. Furthermore, this method holds great promise for the application of multi-degree-of-freedom wireless charging in mobile electronic devices such as smartphones and tablets.

[0028] Furthermore, in some embodiments of the present invention, a current parameterization model is established based on the equivalent circuit model, including: obtaining voltage parameters, inductance parameters, capacitance parameters and resistance parameters based on the equivalent circuit model; establishing the Kirchhoff voltage model of the transmitting end and the receiving end according to the fundamental wave analysis method of the equivalent circuit model; and establishing a current parameterization model based on the Kirchhoff voltage model.

[0029] In this embodiment, first, voltage parameters, inductance parameters, capacitance parameters, and resistance parameters are further acquired according to the equivalent circuit model.

[0030] Then, based on the equivalent circuit model and the fundamental wave analysis method, the Kirchhoff voltage model of the transmitting and receiving ends is established, and then based on the Kirchhoff voltage model, the current parameterization model is established.

[0031] Specifically, the equation of Kirchhoff's voltage model is: ; in, is the resonant compensation inductor in the i-th LCC resonant compensation network, is the parallel compensation capacitor in the i-th LCC resonant compensation network, is the series compensation capacitor in the i-th LCC resonant compensation network, is the self-inductance of the transmitting coil in the i-th LCC resonant compensation network, is the equivalent series resistance of the transmitting coil in the i-th LCC resonant compensation network, is the self-inductance of the receiving coil, is the equivalent series resistance of the receiving coil, is the mutual inductance between the transmitting coil and the receiving coil in the i-th LCC resonant compensation network, is the series compensation capacitor of the receiving coil, VD1~VD4 are the diodes in the rectifier bridge, is the filter capacitor on the secondary side, is the load resistance on the secondary side. is the DC input voltage of the system, is the DC input current of the system, is the output voltage of the inverter in the i-th LCC resonant compensation network, is the output current of the inverter in the i-th LCC resonant compensation network, is the excitation current of the transmitting coil in the i-th LCC resonant compensation network, is the current of the receiving coil, is the input voltage of the rectifier, is the output voltage of the system.

[0032] Preferably, in step 1, the LCC resonant compensation network and The high-order harmonics can be filtered out and the fundamental wave approximation method is used for analysis. The output voltage of the inverter in the i-th LCC resonant compensation network is It can be expressed as .

[0033] Where, is the phase shift angle of the inverter in the i-th LCC resonant compensation network.

[0034] The three coils in the composite planar coil are decoupled from each other, and the mutual inductance between the three transmitting coils is not considered. In order for the system to work in a resonant state, the relationship should be satisfied: Where, is the operating angular frequency, , f is the operating frequency of the system.

[0035] Furthermore, in some embodiments of the present invention, based on the current parameterization model, the current parameters of the transmitting end and the receiving end of the equivalent circuit model are obtained, including: substituting the resonant compensation inductance and the phase shift angle in the equivalent circuit model into the current parameterization model to obtain the coil excitation current of the primary side in the equivalent circuit model; substituting the mutual inductance and the resonant compensation inductance in the equivalent circuit model into the current parameterization model to obtain the receiving coil current of the secondary side and the current of the full-bridge inverter in the equivalent circuit model respectively.

[0036] Specifically, the formula of the current parameterization model is: ; ; .

[0037] in, is the rectifier equivalent resistance, .

[0038] Furthermore, in some embodiments of the present invention, efficiency parameters of the inverter are obtained based on current parameters, including: obtaining the output power of the LCC-S compensation structure based on the load resistance of the secondary side and the receiving coil current in the equivalent circuit model; and obtaining the output efficiency based on the output power.

[0039] In this embodiment, the output power of the LCC-S compensation structure is firstly obtained based on the load resistance of the secondary side and the receiving coil current in the equivalent circuit model, and then the output efficiency is further obtained based on the output power.

[0040] Specifically, the formula for output power is: .

[0041] Specifically, the formula for output efficiency is: .

[0042] Furthermore, in some embodiments of the present invention, three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model are respectively obtained, and an optimal phase shift angle is obtained based on the three mutual inductance parameters and the efficiency parameter, including: obtaining system parameters of the LCC-S compensation structure; respectively detecting and recording the system DC input current when a single inverter is operating, and respectively obtaining three mutual inductance values ​​of the three transmitting coils relative to the receiving coil in the equivalent circuit model; selecting the mutual inductance value with the largest absolute value among the three mutual inductance values, using the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​as a reference value, and determining the signs of the three mutual inductance values ​​based on a combined excitation method; setting the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​to 180°, and obtaining the remaining two phase shift angles at maximum efficiency as the optimal phase shift angles based on the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values; wherein the system parameters include: DC input voltage, operating angular frequency, compensation inductance, transmitting coil internal resistance, receiving coil internal resistance, and load resistance.

[0043] In this embodiment, first, the system parameters of the LCC-S compensation structure are obtained, wherein the system parameters include: the DC input voltage of the system , working angular frequency , resonant compensation inductor , the equivalent series resistance of the transmitting coil , the equivalent series resistance of the receiving coil and the secondary side load resistance .

[0044] Then, the system DC input current when a single inverter is working is detected and recorded. When a single inverter is working, the output current of the inverter can be expressed as: ;in, is the output current of the inverter in the i-th LCC resonant compensation network when working alone. Then, the system DC input current is calculated based on the output current of the inverter working alone. The system DC input current can be expressed as: ; in, is the system DC input current.

[0045] On this basis, the three mutual inductance values ​​of the three transmitting coils to the receiving coil in the equivalent circuit model are obtained respectively. The formula for calculating the mutual inductance value is: .

[0046] Because the sign of the mutual inductance value is uncertain at this time, it is necessary to confirm the sign of the mutual inductance value, select the mutual inductance value with the largest absolute value among the three mutual inductance values, use the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​as the reference value, and judge the signs of the three mutual inductance values ​​based on the combined excitation method.

[0047] Then, because three mutual inductance values ​​are determined, in this case, the output efficiency is related to the phase shift angle. The phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​is set to 180°. Based on the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values, the remaining two phase shift angles at maximum efficiency are obtained as the optimal phase shift angles.

[0048] Specifically, determining the signs of the three mutual inductance values ​​based on the combined excitation method includes: obtaining the combination of all signs of the remaining two phase shift angles, detecting and recording the system DC input current under each combination, and taking the phase shift angle sign corresponding to the maximum system DC input current as the sign of the mutual inductance.

[0049] Specifically, based on the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values, the remaining two phase shift angles under maximum efficiency are obtained as the optimal phase shift angles, including: setting phase shift angle constraints, solving the optimal phase shift angle corresponding to the maximum efficiency by solving the extreme value of the ternary function, and setting ; Optimize for maximum efficiency The following relationship should be satisfied: ; Where, , ; , Among them, the expression of the phase shift angle constraint is: ; in, is the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values.

[0050] Then the remaining two phase shift angles at maximum efficiency can be obtained.

[0051] Furthermore, in some embodiments of the present invention, energy transfer optimization of the LCC-S compensation structure is performed based on the optimal phase shift angle, including: monitoring whether a change in the system DC input current exceeds a change threshold; if so, re-obtaining the optimal phase shift angle; otherwise, determining that the current phase shift angle is the optimal phase shift angle; and detecting whether the LCC-S compensation structure needs to stop working; if so, terminating the operation; otherwise, monitoring again whether the LCC-S compensation structure needs to stop working.

[0052] Furthermore, in some embodiments of the present invention, the specific expression of the current parameterization model is: First, if Figure 2 As shown, this is a schematic diagram of the LCC-S compensation structure. According to the LCC-S compensation structure, Figure 3 The equivalent circuit model shown in Figure 1 is used. Based on the equivalent circuit model, the voltage parameters, inductance parameters, capacitance parameters, and resistance parameters are further obtained. Based on the equivalent circuit model and the fundamental wave analysis method, the Kirchhoff voltage model of the transmitter and receiver is established. Based on the Kirchhoff voltage model, the current parameterization model is established.

[0053] The resonant compensation inductance and phase shift angle in the equivalent circuit model are substituted into the current parameterized model to obtain the coil excitation current of the primary side in the equivalent circuit model; the mutual inductance and resonant compensation inductance in the equivalent circuit model are substituted into the current parameterized model to obtain the receiving coil current of the secondary side and the current of the full-bridge inverter in the equivalent circuit model respectively.

[0054] At this time, it is determined whether the LCC-S compensation structure needs to be optimized for energy transfer. The determination method is to judge whether the efficiency parameter is the maximum value through the value of the efficiency parameter. If the efficiency parameter is not the maximum value, the system parameters of the LCC-S compensation structure are obtained, where the system parameters include: the DC input voltage of the system , working angular frequency , resonant compensation inductor , the equivalent series resistance of the transmitting coil , the equivalent series resistance of the receiving coil and the secondary side load resistance The system DC input current of each inverter is then detected and recorded. Based on this, the three mutual inductance values ​​of the three transmitting coils relative to the receiving coils in the equivalent circuit model are obtained. Because the signs of the mutual inductance values ​​are uncertain at this point, they need to be confirmed. The mutual inductance value with the largest absolute value among the three is selected, and the phase shift angle corresponding to the largest absolute value is used as a reference value. The signs of the three mutual inductance values ​​are then determined using the combined excitation method.

[0055] Then, because three mutual inductance values ​​are determined, in this case, the output efficiency is related to the phase shift angle. The phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​is set to 180°. Based on the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values, the remaining two phase shift angles at maximum efficiency are obtained as the optimal phase shift angles.

[0056] In a second aspect, the present invention discloses an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0057] In a third aspect, the present invention discloses a computer-readable storage medium storing a computer program executable by an electronic device, which enables the electronic device to execute the steps of the above method when the computer program runs on the electronic device.

[0058] In a fourth aspect, the present invention discloses an energy transmission optimization system for an omnidirectional wireless power transmission system, comprising: Equivalent circuit model building module, based on the LCC-S compensation structure, obtains the equivalent circuit model; A current parameterized model building module is used to build a current parameterized model based on the equivalent circuit model; A current parameter acquisition module, which acquires current parameters of a transmitting end and a receiving end of an equivalent circuit model based on the current parameterization model; An efficiency parameter acquisition module obtains the efficiency parameters of the inverter based on the current parameters; an optimal phase shift angle acquisition module, configured to determine whether the efficiency parameter is a maximum value; if the efficiency parameter is not a maximum value, respectively acquire three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model; and acquire an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter; An energy transfer optimization module performs energy transfer optimization on the LCC-S compensation structure based on the optimal phase shift angle.

[0059] In the claims, specification and drawings of the present invention, the term "plurality" refers to two or more. Unless otherwise expressly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of more conveniently describing the present invention and making the description process simpler. It is not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions cannot be understood as limiting the present invention. The terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0060] In the claims, specification, and drawings of the present invention, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification, and drawings of the present invention, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0061] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for optimizing energy transmission in an omnidirectional wireless power transmission system, characterized in that: include: Based on the LCC-S compensation structure, an equivalent circuit model is obtained; Based on the equivalent circuit model, a current parameterization model is established; Based on the current parameterized model, obtaining current parameters of the transmitting end and the receiving end of the equivalent circuit model; Based on the current parameters, the efficiency parameters of the inverter are obtained; Determining whether the efficiency parameter is a maximum value; if the efficiency parameter is not a maximum value, respectively obtaining three mutual inductance parameters of the three transmitting coils with respect to the receiving coil in the equivalent circuit model; and obtaining an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter; Based on the optimal phase shift angle, energy transfer of the LCC-S compensation structure is optimized.

2. The energy transmission optimization method of the omnidirectional wireless power transmission system according to claim 1, characterized in that: The step of establishing a current parameterized model based on the equivalent circuit model includes: Based on the equivalent circuit model, obtaining voltage parameters, inductance parameters, capacitance parameters and resistance parameters; The equivalent circuit model establishes Kirchhoff voltage models of the transmitting end and the receiving end according to the fundamental wave analysis method; Based on the Kirchhoff voltage model, the current parameterization model is established.

3. The energy transmission optimization method of the omnidirectional wireless power transmission system according to claim 2, characterized in that: The obtaining of current parameters of a transmitting end and a receiving end of an equivalent circuit model based on the current parameterized model includes: Substituting the resonant compensation inductance and phase shift angle in the equivalent circuit model into the current parameterized model to obtain the primary coil excitation current in the equivalent circuit model; The mutual inductance and the resonant compensation inductance in the equivalent circuit model are substituted into the current parameterization model to obtain the secondary side receiving coil current and the full-bridge inverter current in the equivalent circuit model respectively.

4. The energy transmission optimization method of the omnidirectional wireless power transmission system according to claim 3, characterized in that: The step of obtaining the efficiency parameter of the inverter based on the current parameter includes: Obtaining the output power of the LCC-S compensation structure based on the load resistance of the secondary side and the receiving coil current in the equivalent circuit model; Based on the output power, an output efficiency is obtained.

5. The energy transmission optimization method of the omnidirectional wireless power transmission system according to claim 1, characterized in that: The step of respectively obtaining three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model, and obtaining an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter, includes: Obtain the system parameters of the LCC-S compensation structure; Detect and record the system DC input current Idci when a single inverter is working, and obtain the three mutual inductance values ​​of the three transmitting coils to the receiving coil in the equivalent circuit model; The mutual inductance value with the largest absolute value among the three mutual inductance values ​​is selected, the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​is used as a reference value, and the signs of the three mutual inductance values ​​are determined based on the combined excitation method; The phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values ​​is set to 180°. Based on the phase shift angle corresponding to the mutual inductance value with the largest absolute value among the three mutual inductance values, the remaining two phase shift angles at maximum efficiency are obtained as the optimal phase shift angles.

6. The energy transmission optimization method of the omnidirectional wireless power transmission system according to claim 5, characterized in that: The optimizing the energy transfer of the LCC-S compensation structure based on the optimal phase shift angle includes: Monitor whether the change of the system DC input current Idci exceeds the change threshold. If the change of the system DC input current Idci exceeds the change threshold, re-obtain the optimal phase shift angle. Otherwise, the current phase shift angle is determined to be the optimal phase shift angle; Detect whether the LCC-S compensation structure needs to stop working. If the LCC-S compensation structure needs to stop working, then end. Otherwise, it is monitored again whether the LCC-S compensation structure needs to stop working.

7. The energy transmission optimization method of the omnidirectional wireless power transmission system according to claim 5, characterized in that: in, The system parameters include: DC input voltage Udc, operating angular frequency ω, compensation inductance Lf, transmitting coil internal resistance Ri, receiving coil internal resistance Rs and load resistance RL.

8. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that It stores a computer program that can be executed by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of the method according to any one of claims 1 to 7.

10. An energy transmission optimization system for an omnidirectional wireless power transmission system, characterized in that: include: Equivalent circuit model building module, based on the LCC-S compensation structure, obtains the equivalent circuit model; A current parameterized model building module is used to build a current parameterized model based on the equivalent circuit model; A current parameter acquisition module, which acquires current parameters of a transmitting end and a receiving end of an equivalent circuit model based on the current parameterization model; An efficiency parameter acquisition module obtains the efficiency parameters of the inverter based on the current parameters; an optimal phase shift angle acquisition module, configured to determine whether the efficiency parameter is a maximum value; if the efficiency parameter is not a maximum value, respectively acquire three mutual inductance parameters of the three transmitting coils relative to the receiving coil in the equivalent circuit model; and acquire an optimal phase shift angle based on the three mutual inductance parameters and the efficiency parameter; An energy transfer optimization module performs energy transfer optimization on the LCC-S compensation structure based on the optimal phase shift angle.

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