Wireless power transmission system with reconfigurable topology

Abstract

The invention discloses a wireless electric energy transmission system with a reconfigurable topology, and relates to the technical field of wireless electric energy transmission. In order to solve the technical problems that in an existing IPT technology research, in the face of wide coupling coefficient fluctuation, nearly constant power transmission cannot be maintained, and meanwhile, the system control complexity cannot be reduced, the technical scheme provided by the invention is that the wireless electric energy transmission system with the reconfigurable topology comprises a wireless electric energy transmission module and a wireless electric energy transmission module, comprising a full-bridge inverter circuit, a primary side compensation network, a coupling coil, a secondary side compensation network and a rectification filter circuit. The input end of the full-bridge inverter circuit is connected with a direct-current voltage source UD, the output end of the full-bridge inverter circuit is connected with the input end of the primary side compensation network, the output end of the primary side compensation network is connected with the primary side input end of the coupling coil, and the secondary side output end of the coupling coil is connected with the input end of the secondary side compensation network. The output end of the secondary side compensation network is connected with the input end of the rectification filter circuit; the output end of the rectification filter circuit is connected with a battery load Ro. The system is suitable for wireless electric energy transmission work.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and in particular to wireless power transmission with reconfigurable topology. Background Art

[0002] Inductive Power Transfer (IPT) technology uses alternating electromagnetic fields as a medium to achieve non-physical contact transmission of energy from power source to load. It has the characteristics of safe, flexible and reliable power supply, and has been widely used in portable electronic devices, implantable medical devices, underwater detectors and other fields. However, in actual applications, the primary transmitting coil and the secondary receiving coil are inevitably misaligned, and the mutual inductance and coupling parameters between the coils change dramatically, which in turn affects the stability of power transmission in the IPT system.

[0003] In response to the above-mentioned problems, domestic and foreign research teams have conducted research from the aspects of closed-loop control technology and compensation topology design. Closed-loop control technology compensates for the fluctuation of the coupling coefficient by real-time detection and adjustment of the system operating parameters, thereby maintaining a stable power output. This method usually requires an additional DC-DC converter or phase-shift control of the inverter module so that the system can adapt to different coupling conditions to maintain a high transmission efficiency. However, although these control methods are accurate, they also have significant defects. First, the system needs to add additional hardware, such as DC-DC converters and related control circuits, which increases the hardware complexity of the system, resulting in an increase in the size of the equipment and an increase in cost. Secondly, phase-shift control involves pulse frequency modulation, which can easily cause system frequency splitting in practical applications, thereby affecting the stability of the system, especially when the coupling coefficient fluctuates greatly, the difficulty of system adjustment is significantly increased, and the complexity and fragility of control also increase accordingly.

[0004] In order to overcome these problems, some research teams have shifted their attention to the design of compensation topologies in order to reduce the system's dependence on closed-loop control. By improving the topological structure of the compensation network, the system can achieve relatively stable power transmission under different coupling conditions. Researchers at the University of Zaragoza in Spain proposed an SP-S compensation topology, which combines the two compensation methods of SS (series-series) and SP (series-parallel), and uses the complementarity of their output characteristics when the coupling coefficient changes to enhance the system's anti-drift capability. Experimental results show that within 25% of the maximum outer dimension of the lateral offset, the system output power drops by no more than 10%. This topological structure improves the system's ability to resist coupling coefficient fluctuations to a certain extent, but there are still some limitations.

[0005] Specifically, as the coupling coefficient further decreases, the system output power of the SP-S compensation topology is still difficult to maintain, and the efficiency also decreases significantly. This is due to the limitations of the compensation topology itself. When the mutual inductance between the coils is weakened to a certain extent, although the compensation network can partially offset this effect, the reactive power of the system increases significantly, resulting in reduced efficiency. At the same time, the combination of multiple compensation topologies also increases the complexity and design difficulty of the system, which increases the cost of the system and the workload of installation and commissioning.

[0006] In addition, some innovative solutions have been proposed in the prior art to address the dramatic fluctuations in coupling coefficients that may occur in different application scenarios. For example, some researchers have improved the transmission performance of the system by adding additional coils or segmented coil configurations. The core idea of ​​these methods is to reduce the negative impact of offset by adjusting the distribution of the magnetic field, but the increased number of coils and the corresponding control circuits also lead to an increase in system complexity and volume, reducing the maintainability and integration of the system. Although these methods can significantly improve the stability of the system in theory, they are often difficult to promote widely in practical applications due to issues such as the size, weight, and cost of the equipment.

[0007] In order to reduce control pressure and system control complexity, compensation topology design has gradually become one of the research hotspots. Through the design of the topological structure, the system can achieve relatively stable power transmission in an open loop and reduce dependence on complex control methods. For example, researchers have tried to combine a variety of compensation elements so that they can automatically adapt to power requirements under different coupling coefficient conditions. However, there is also a certain trade-off in the combination of these compensation elements, that is, the improvement of performance under certain conditions is often at the expense of efficiency under other conditions. Therefore, how to achieve efficient power transmission in a wide coupling range while ensuring the simplicity of the system structure is still a problem that needs to be solved.

[0008] In summary, facing wide coupling coefficient fluctuations, how to maintain nearly constant power transmission while reducing system control complexity is one of the key issues in IPT technology research. Summary of the invention

[0009] In order to overcome the technical problems in existing IPT technology research, such as the inability to maintain nearly constant power transmission in the face of wide coupling coefficient fluctuations and the inability to reduce the complexity of system control, the technical solution provided by the present invention is as follows: A wireless power transmission system with a reconfigurable topology includes a full-bridge inverter circuit, a primary compensation network, a coupling coil, a secondary compensation network, and a rectifier filter circuit; The input end of the full-bridge inverter circuit is connected to a DC voltage source U DThe output end is connected to the input end of the primary compensation network, the output end of the primary compensation network is connected to the primary input end of the coupling coil, the secondary output end of the coupling coil is connected to the input end of the secondary compensation network, and the output end of the secondary compensation network is connected to the input end of the rectifier filter circuit; the output end of the rectifier filter circuit is connected to the battery load R o .

[0010] Further, a preferred embodiment is provided, wherein the primary compensation network includes a primary series compensation capacitor C p1 , primary circuit compensation capacitor C p2 , primary branch compensation capacitor C p0 And the primary branch AC switch S 0; The coupling coil includes a primary first transmitting coil L p1 , primary side second transmitting coil L p2 and the secondary receiving coil L s ; The secondary side compensation network includes a secondary side series compensation capacitor C s .

[0011] Further, a preferred embodiment is provided, in the primary compensation network: The primary side series compensation capacitor C p1 One end is connected to an output end of the full-bridge inverter circuit, and the other end is connected to the primary first transmitting coil L p1 one end of The primary circuit compensation capacitor C p2 One end of the full-bridge inverter circuit is connected to the other output end of the full-bridge inverter circuit and the primary branch compensation capacitor C p0 one end, and the primary branch AC switch S 0, the primary loop compensation capacitor C p2 The other end is connected to the primary second transmitting coil L p2 one end of The primary branch compensation capacitor C p0 One end of the full-bridge inverter circuit and the primary loop compensation capacitor are connected C p2 One end of the primary branch compensation capacitor is connected toC p0 The other end is connected to the primary branch AC switch S 0, and the first transmitting coil of the primary side L p1 and the primary second transmitting coil L p2 The connected end.

[0012] Further, a preferred embodiment is provided, by controlling the primary branch AC switch S 0 is turned on and off, the system enters two working modes, and corresponds to different coupling coefficient fluctuation ranges, namely working mode 1 and working mode 2.

[0013] Further, a preferred embodiment is provided, wherein the primary branch AC switch S When 0 is turned on, that is, working mode 1: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series detuned network is formed; the secondary side series compensation capacitor in the secondary side compensation network C s and the secondary receiving coil in the coupling coil L s A series resonant network is formed.

[0014] Further, a preferred embodiment is provided, wherein the primary branch AC switch S When 0 is disconnected, it is working mode 2: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series resonant network is formed, and the primary circuit compensation capacitor in the primary compensation network C p2 , primary branch compensation capacitor C p0 and the primary side second transmitting coil in the coupling coil L p2 A parallel resonant network is formed; a secondary side series compensation capacitor in the secondary side compensation network C s and the secondary receiving coil in the coupling coil Ls A series resonant network is formed.

[0015] Based on the same inventive concept, the present invention also provides a method for designing parameters of a wireless power transmission system with a reconfigurable topology, which is implemented based on the system and includes: Step 1: Collect the steps of preset system technical indicators; Step 2: Designing the system power-coupling curve according to the system technical indicators; Step 3: According to the resonant state or relationship of the primary-secondary compensation network in the working mode 1 and the working mode 2, the step of adjusting the compensation component parameters is completed.

[0016] Based on the same inventive concept, the present invention also provides a computer storage medium for storing a computer program. When the computer reads the computer program, the computer executes the method described.

[0017] Based on the same inventive concept, the present invention also provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method described.

[0018] Based on the same inventive concept, the present invention also provides a computer program product, which is a computer program. When the computer program is executed, the method described above is implemented.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects: By controlling the on and off of the primary branch AC switch, the system can reconfigure the topology within different coupling coefficient fluctuation ranges, thereby effectively solving the power instability problem caused by the change of the coupling coefficient. Compared with the existing closed-loop control scheme, the control method of the present invention does not require additional DC-DC converters or phase shift control, thus significantly reducing the complexity and control cost of the system.

[0020] Only one series compensation capacitor is used in the secondary compensation network, making the system structure simpler and more compact. This design effectively reduces the number of compensation components required by the system, thereby reducing the volume and weight of the system, and showing higher integration and portability in application scenarios. Compared with other topological structures with multiple compensation components, the design of the present invention is simpler and is conducive to installation and maintenance in practical applications.

[0021] The system adopts a full-bridge inverter circuit and ensures that the inverter switch tube is always turned on under zero voltage conditions through the reasonable configuration of compensation elements. This feature significantly improves the efficiency of the system, reduces switching losses, and also avoids overcurrent in the transmitting coil, making the system safer and more reliable during power transmission. Compared with the traditional phase-shift control scheme, the zero-voltage conduction control method of the present invention significantly reduces the requirements for system control accuracy while improving efficiency.

[0022] Through the design of working mode 1 and working mode 2, the system can maintain stable power output within a wide range of coupling coefficient fluctuations. This design effectively solves the problem of output power drop caused by drastic changes in the coupling coefficient in the prior art. Compared with other compensation topologies, this solution is more superior in anti-coupling coefficient fluctuation performance, especially in the case of a large range of offsets, it can still maintain a high output power.

[0023] Suitable for use in wireless power transmission work. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the main circuit architecture of a wireless power transmission system with a reconfigurable topology; Figure 2 The primary branch AC switch S 0 is turned on, that is, the system equivalent circuit diagram in working mode 1; Figure 3 The primary branch AC switch S 0 is disconnected, that is, the system equivalent circuit diagram in working mode 2; Figure 4 A flowchart of the steps of a method for designing parameters of a wireless power transfer system with a reconfigurable topology; Figure 5 This is a design diagram of the system power-coupling curve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Embodiment 1: This embodiment provides a wireless power transmission system with a reconfigurable topology, including a full-bridge inverter circuit, a primary compensation network, a coupling coil, a secondary compensation network, and a rectifier filter circuit; The input end of the full-bridge inverter circuit is connected to a DC voltage source U DThe output end is connected to the input end of the primary compensation network, the output end of the primary compensation network is connected to the primary input end of the coupling coil, the secondary output end of the coupling coil is connected to the input end of the secondary compensation network, and the output end of the secondary compensation network is connected to the input end of the rectifier filter circuit; the output end of the rectifier filter circuit is connected to the battery load R o .

[0026] Embodiment 2: This embodiment further limits the wireless power transmission system with a reconfigurable topology provided in Embodiment 1. The primary compensation network includes a primary series compensation capacitor. C p1 , primary circuit compensation capacitor C p2 , primary branch compensation capacitor C p0 And the primary branch AC switch S 0; The coupling coil includes a primary first transmitting coil L p1 , primary side second transmitting coil L p2 and the secondary receiving coil L s ; The secondary side compensation network includes a secondary side series compensation capacitor C s .

[0027] Implementation method 3: This implementation method is a further limitation of a wireless power transmission system with a reconfigurable topology provided in implementation method 2, wherein in the primary side compensation network: The primary side series compensation capacitor C p1 One end is connected to an output end of the full-bridge inverter circuit, and the other end is connected to the primary first transmitting coil L p1 one end of The primary circuit compensation capacitor C p2 One end of the full-bridge inverter circuit is connected to the other output end of the full-bridge inverter circuit and the primary branch compensation capacitor C p0 one end, and the primary branch AC switch S 0, the primary loop compensation capacitor C p2 The other end is connected to the primary second transmitting coil L p2 one end of The primary branch compensation capacitor C p0One end of the full-bridge inverter circuit and the primary loop compensation capacitor are connected C p2 One end of the primary branch compensation capacitor is connected to C p0 The other end is connected to the primary branch AC switch S 0, and the first transmitting coil of the primary side L p1 and the primary second transmitting coil L p2 The connected end.

[0028] Embodiment 4: This embodiment further limits the wireless power transmission system with a reconfigurable topology provided in Embodiment 3, by controlling the primary branch AC switch S 0 is turned on and off, the system enters two working modes, and corresponds to different coupling coefficient fluctuation ranges, namely working mode 1 and working mode 2.

[0029] Implementation mode 5: This implementation mode further limits the wireless power transmission system with reconfigurable topology provided in implementation mode 4. The primary branch AC switch S When 0 is turned on, that is, working mode 1: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series detuned network is formed; the secondary side series compensation capacitor in the secondary side compensation network C s and the secondary receiving coil in the coupling coil L s A series resonant network is formed.

[0030] Implementation 6: This implementation is a further limitation of the wireless power transmission system with a reconfigurable topology provided in Implementation 4. The primary branch AC switch S When 0 is disconnected, it is working mode 2: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series resonant network is formed, and the primary circuit compensation capacitor in the primary compensation network C p2, primary branch compensation capacitor C p0 and the primary side second transmitting coil in the coupling coil L p2 A parallel resonant network is formed; a secondary side series compensation capacitor in the secondary side compensation network C s and the secondary receiving coil in the coupling coil L s A series resonant network is formed.

[0031] Embodiment 7: This embodiment provides a method for designing parameters of a wireless power transmission system with a reconfigurable topology, based on the system implementation provided in embodiment 4, including: Step 1: Collect the steps of preset system technical indicators; Step 2: Designing the system power-coupling curve according to the system technical indicators; Step 3: According to the resonant state or relationship of the primary-secondary compensation network in the working mode 1 and the working mode 2, the step of adjusting the compensation component parameters is completed.

[0032] Embodiment 8: This embodiment provides a computer storage medium for storing a computer program. When the computer reads the computer program, the computer executes the method provided in embodiment 7.

[0033] Embodiment 9: This embodiment provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method provided in embodiment 7.

[0034] Embodiment 10: This embodiment provides a computer program product, which is a computer program. When the computer program is executed, the method provided in embodiment 7 is implemented.

[0035] Implementation Method XI: Combination Figure 1-5 This embodiment is described. This embodiment further clearly and completely describes the technical solution provided above through specific examples. Specifically: like Figure 1 As shown, this embodiment provides a wireless power transmission system with a reconfigurable topology, including a full-bridge inverter circuit, a primary compensation network, a coupling coil, a secondary compensation network, and a rectifier filter circuit; The input end of the full-bridge inverter circuit is connected to a DC voltage source U D, whose output end is connected to the input end of the primary compensation network, the output end of the primary compensation network is connected to the primary input end of the coupling coil, the secondary output end of the coupling coil is connected to the input end of the secondary compensation network, and the output end of the secondary compensation network is connected to the input end of the rectifier filter circuit; the output end of the rectifier filter circuit is connected to the battery load R o ; The primary compensation network consists of a primary series compensation capacitor C p1 , primary circuit compensation capacitor C p2 , primary branch compensation capacitor C p0 , Primary branch AC switch S 0 composition; The coupling coil is composed of the primary first transmitting coil L p1 , primary side second transmitting coil L p2 , secondary receiving coil L s constitute; The secondary side compensation network consists of a secondary side series compensation capacitor C s constitute.

[0036] In the primary side compensation network: The primary side series compensation capacitor C p1 One end of the primary side is connected to an output end of the full-bridge inverter circuit, and the primary side is connected in series with a compensation capacitor C p1 The other end is connected to the primary first transmitting coil L p1 one end of The primary circuit compensation capacitor C p2 One end of the full-bridge inverter circuit is connected to the other output end of the full-bridge inverter circuit and the primary branch compensation capacitor C p0 one end of the primary branch AC switch S 0, the primary loop compensation capacitor C p2 The other end is connected to the primary second transmitting coil L p2 one end of The primary branch compensation capacitor C p0 One end of the full-bridge inverter circuit is connected to the other output end of the primary loop compensation capacitor C p2one end of the primary branch AC switch S 0, the primary branch compensation capacitor C p0 The other end is connected to the primary branch AC switch S 0, the other end of the primary first transmitting coil L p1 The other end of the primary second transmitting coil L p2 The other end of The primary branch AC switch S One end of 0 is connected to the other output end of the full-bridge inverter circuit and the primary loop compensation capacitor C p2 One end of the primary branch compensation capacitor C p0 At one end, the primary branch AC switch S The other end of 0 is connected to the primary branch compensation capacitor C p0 The other end of the primary first transmitting coil L p1 The other end of the primary second transmitting coil L p2 the other end.

[0037] like Figure 2 , Figure 3 , Figure 5 As shown, by controlling the primary branch AC switch S 0 is turned on and off, and the system has two working modes, which correspond to different coupling coefficient fluctuation ranges.

[0038] like Figure 2 As shown, the primary branch AC switch S When 0 is turned on, that is, working mode 1: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series detuned network is formed; the secondary side series compensation capacitor in the secondary side compensation network C s and the secondary receiving coil in the coupling coil L s Form a series resonant network; Specifically: (1) In the formula, is the primary side detuning rate in working mode 1; like Figure 3 As shown, the primary branch AC switch S When 0 is disconnected, it is working mode 2: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series resonant network is formed, and the primary circuit compensation capacitor in the primary compensation network C p2 , primary branch compensation capacitor C p0 and the primary side second transmitting coil in the coupling coil L p2 A parallel resonant network is formed; a secondary side series compensation capacitor in the secondary side compensation network C s and the secondary receiving coil in the coupling coil L s Form a series resonant network; Specifically: (2) like Figure 4 As shown, the present invention also provides a method for designing parameters of a wireless power transmission system with a reconfigurable topology, comprising the following steps: Step 1: Set the system technical indicators according to the actual working conditions. Specifically include: DC input voltage U D , preset output power P oset , Battery equivalent load R o , system operating frequency , coupling change multiple , the first transmitting coil on the primary side L p1 , primary side second transmitting coil L p2 , secondary receiving coil L s , minimum working coupling coefficient k min ; The step 1 specifically includes: The coupling change multiple under the working mode 1 The definition of is: (3) The coupling change factor under the working mode 2 The definition of is: (4) In formula (3) and formula (4), k max is the maximum working coupling coefficient, k cri is the critical coupling coefficient when the switch is switched, k min is the minimum working coupling coefficient.

[0039] In actual design, in order to maximize the system's ability to resist coupling coefficient fluctuations, it is usually .

[0040] Step 2: Design the system power-coupling curve according to the set technical indicators . Specifically including: Peak coupling coefficient under working mode 1 k ex1 , critical coupling coefficient when switching k cri , peak coupling coefficient under working mode 2 k ex2 , Maximum working coupling coefficient k max , the actual coupling change multiple , System output power fluctuation ; The step 2 specifically includes: Combination Figure 2 and Figure 5 As shown, the system power-coupling curve under the working mode 1 is , where the system output power P o1 With the coupling coefficient k p1s Decrease, its value increases first and then decreases, the specific expression is: (5) The current flowing through the primary first transmitting coil in the working mode 1 L p1 Current I p11 The expression is as follows: (6) Further, when M p1s →0 o'clock, I p11 equal: (7) It can be seen from formula (7) that when the receiving coil deviates from the allowed working range or is completely evacuated, the current flowing through the transmitting coil will not increase exponentially, thus avoiding the risk of overcurrent in the transmitting coil.

[0041] The system input impedance in working mode 1 Z in1 and its phase angle θ in1 The expression is as follows: (8) From formula (8), we can see that the system input impedance Z in1 Inductive, it is expected to achieve zero voltage conduction of the inverter switch tube; in addition, the input impedance phase angle θ in1 The variation range of can be expressed as: , is the coupling change multiple under working mode 1.

[0042] Combination Figure 3 and Figure 5 As shown, the system power-coupling curve under the working mode 2 , where the system output power P o2 With the coupling coefficient k p1s , coupling coefficient k p2s Decrease, its value increases first and then decreases, the specific expression is: (9) The current flowing through the primary first transmitting coil in the working mode 2 L p1 Current I p12 and flows through the primary second transmitting coil L p2 Current I p22 The expression is as follows: (10) Further, when M p1s →0, M p2s →0 o'clock, I p12 and I p22 are respectively equal to: (11) It can be seen from formula (11) that when the receiving coil deviates from the allowed working range or is completely evacuated, the current flowing through the transmitting coil will not surge exponentially, thus avoiding the risk of overcurrent in the transmitting coil.

[0043] The system input impedance in working mode 2 Z in2 and its phase angle θ in2 The expression is as follows: (12) From formula (12), we can see that the system input impedance Z in2 Inductive, it is expected to achieve zero voltage conduction of the inverter switch tube; in addition, the input impedance phase angle θ in2 The variation range of can be expressed as: , is the coupling change multiple under working mode 2.

[0044] In formula (5) to formula (12), , , , ; L p1 is the self-inductance of the first transmitting coil on the primary side, L p2 is the self-inductance of the second primary transmitting coil, and , L s is the self-inductance of the secondary receiving coil, C p0 is the capacitance value of the primary branch compensation capacitor; M p1s is the main coupling mutual inductance between the first transmitting coil on the primary side and the receiving coil on the secondary side, M p2s is the main coupling mutual inductance between the primary second transmitting coil and the secondary receiving coil, and ; k p1s is the coupling coefficient between the primary first transmitting coil and the secondary receiving coil, k p2s is the coupling coefficient between the second transmitting coil on the primary side and the receiving coil on the secondary side, let ; is the system operating angular frequency, that is , f is the system operating frequency; U D is the voltage value of the DC voltage source, U AB is the output voltage value of the full-bridge inverter circuit, and , R o is the resistance value of the battery equivalent load, R eq is the equivalent AC resistance value before the rectifier and filter circuit, and ; j is an imaginary unit; is the primary side detuning rate in working mode 1, and ,in, k cri is the critical coupling coefficient when the switch is switched.

[0045] like Figure 5 As shown, the peak coupling coefficient under the working mode 1 is k ex1 , the critical coupling coefficient when the switch is switched k cri , the peak coupling coefficient under the working mode 2 k ex2 , the maximum working coupling coefficient k max The minimum working coupling coefficient k min The following relationships exist: (13) in, is the coupling change multiple under working mode 2, is the coupling change multiple under working mode 1.

[0046] The actual coupling change factor The definition of is: (14) And specify the actual coupling change multiple It can be calculated by the following formula: (15) The system output power fluctuates The calculation formula is: (16) In formula (14) to (16), k max is the maximum working coupling coefficient, k min is the minimum working coupling coefficient, is the coupling change multiple under working mode 2, is the coupling change multiple under working mode 1, is the coupling change factor, and .

[0047] Step 3: According to the resonant state or relationship of the primary and secondary compensation networks in the system under working modes 1 and 2, complete the adjustment of the parameters of each compensation component. Specifically including: primary series compensation capacitor C p1 , primary circuit compensation capacitor C p2 , primary branch compensation capacitor C p0 , Secondary side series compensation capacitor C s .

[0048] The step three specifically includes: The primary side series compensation capacitor in the primary side compensation network C p1 The calculation formula is as follows: (17) The primary loop compensation capacitor in the primary compensation network C p2 The calculation formula is as follows: (18) The primary branch compensation capacitor in the primary compensation network C p0 The calculation formula is as follows: (19) The secondary side series compensation capacitor in the secondary side compensation network C s The calculation formula is as follows: (20) In formula (17) to formula (20), L p1 is the self-inductance of the first transmitting coil on the primary side, L p2 is the self-inductance of the second transmitting coil on the primary side, L s is the self-inductance of the secondary receiving coil; is the system operating angular frequency, that is , f is the system operating frequency; is the coupling change multiple; R o is the resistance value of the battery equivalent load; k cri is the critical coupling coefficient when the switch is switched.

[0049] Compared with the existing technology, the topology of the primary compensation network can be reconfigured by controlling the on and off of the AC switch, while the secondary compensation network is always a series resonant network, thereby realizing the switching of the system working mode and connecting two different coupling coefficient fluctuation ranges end to end.

[0050] It is able to maintain nearly constant power transmission within a wide coupling coefficient fluctuation range, and the inverter switch tube always maintains zero voltage conduction, while avoiding the risk of overcurrent in the transmitting coil. The secondary side compensation network has only one series compensation capacitor, and the system structure is more compact, simple and lightweight.

[0051] Without the need for any additional loop iteration or optimization algorithm, the assignment calculation can be performed directly, which enables the rapid determination of all system parameters and simplifies the system parameter design steps.

[0052] By introducing a controllable primary branch AC switch, the system can switch between two working modes, thereby connecting two different coupling coefficient fluctuation ranges end to end, and maintaining the stability of power transmission within a wider coupling range. Compared with the closed-loop control method, the method of the present invention does not require the introduction of an additional DC-DC converter or complex control circuit, thereby significantly reducing the complexity, volume and cost of the system.

[0053] The system can automatically adjust according to the coupling conditions in different working modes. In working mode 1, the system uses a series detuned network to cope with higher coupling coefficients, while in working mode 2, the system uses a combination of series and parallel resonant networks to adapt to lower coupling coefficients. This design enables the system to maintain stable output power in a wide range of coupling coefficient fluctuations while avoiding a significant increase in reactive power.

[0054] In summary, common problems in the prior art include: high system hardware complexity, high control difficulty, insufficient stability of power transmission, and low efficiency. The technical solution provided in this embodiment significantly improves the stability and efficiency of the system under different coupling conditions without adding additional complex control means through topological reconstruction of the compensation network, and has high practical application value.

[0055] The technical solution provided by the present invention is further described in detail above through several specific implementation modes in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific implementation modes described above are not intended to be used as limitations on the present invention. Any reasonable modification and improvement of the present invention, combination of implementation modes and equivalent substitution within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wireless power transmission system with a reconfigurable topology, characterized in that: Including full-bridge inverter circuit, primary side compensation network, coupling coil, secondary side compensation network, rectifier filter circuit; The input end of the full-bridge inverter circuit is connected to a DC voltage source U D The output end is connected to the input end of the primary compensation network, the output end of the primary compensation network is connected to the primary input end of the coupling coil, the secondary output end of the coupling coil is connected to the input end of the secondary compensation network, and the output end of the secondary compensation network is connected to the input end of the rectifier filter circuit; the output end of the rectifier filter circuit is connected to the battery load R o .

2. A wireless power transmission system with reconfigurable topology according to claim 1, characterized in that: The primary compensation network includes a primary series compensation capacitor C p1 , primary circuit compensation capacitor C p2 , primary branch compensation capacitor C p0 And the primary branch AC switch S 0; The coupling coil includes a primary first transmitting coil L p1 , primary side second transmitting coil L p2 and the secondary receiving coil L s ; The secondary side compensation network includes a secondary side series compensation capacitor C s .

3. A wireless power transmission system with reconfigurable topology according to claim 2, characterized in that: In the primary side compensation network: The primary side series compensation capacitor C p1 One end is connected to an output end of the full-bridge inverter circuit, and the other end is connected to the primary first transmitting coil L p1 one end of The primary circuit compensation capacitor C p2 One end of the full-bridge inverter circuit is connected to the other output end of the full-bridge inverter circuit and the primary branch compensation capacitor C p0 one end, and the primary branch AC switch S 0, the primary loop compensation capacitor C p2 The other end is connected to the primary second transmitting coil L p2 one end of The primary branch compensation capacitor C p0 One end of the full-bridge inverter circuit and the primary loop compensation capacitor are connected C p2 One end of the primary branch compensation capacitor is connected to C p0 The other end is connected to the primary branch AC switch S 0, and the first transmitting coil of the primary side L p1 and the primary second transmitting coil L p2 The connected end.

4. The wireless power transmission system with reconfigurable topology according to claim 3, characterized in that: By controlling the primary branch AC switch S 0 is turned on and off, the system enters two working modes, and corresponds to different coupling coefficient fluctuation ranges, namely working mode 1 and working mode 2.

5. A wireless power transmission system with reconfigurable topology according to claim 4, characterized in that: The primary branch AC switch S When 0 is turned on, that is, working mode 1: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series detuned network is formed; the secondary side series compensation capacitor in the secondary side compensation network C s and a secondary receiving coil in the coupling coil L s A series resonant network is formed.

6. The wireless power transmission system with reconfigurable topology according to claim 4, characterized in that: The primary branch AC switch S When 0 is disconnected, it is working mode 2: The primary side series compensation capacitor in the primary side compensation network C p1 , primary branch compensation capacitor C p0 and the primary first transmitting coil in the coupling coil L p1 A series resonant network is formed, and the primary circuit compensation capacitor in the primary compensation network C p2 , primary branch compensation capacitor C p0 and the primary side second transmitting coil in the coupling coil L p2 A parallel resonant network is formed; a secondary side series compensation capacitor in the secondary side compensation network C s and a secondary receiving coil in the coupling coil L s A series resonant network is formed.

7. A method for designing parameters of a wireless power transmission system with a reconfigurable topology, based on the system implementation of claim 4, characterized in that: include: Step 1: Collect the steps of preset system technical indicators; Step 2: Designing the system power-coupling curve according to the system technical indicators; Step 3: According to the resonant state of the primary-secondary compensation network in the working mode 1 and the working mode 2, the step of adjusting the compensation component parameters is completed.

8. A computer storage medium for storing a computer program, characterized in that: When the computer reads the computer program, the computer executes the method of claim 7.

9. A computer, comprising a processor and a storage medium, characterized in that: When the processor reads the computer program stored in the storage medium, the computer executes the method of claim 7 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method of claim 7 is implemented.

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