Double-end anti-offset output compensation structure and parameter construction method thereof

Abstract

The invention discloses a double-end anti-offset output compensation structure and a parameter construction method thereof. The double-end anti-offset output compensation structure comprises a direct-current power supply, a full-bridge inverter circuit, a primary side transmitting circuit, a first secondary side receiving circuit, a second secondary side receiving circuit and a corresponding rectifying and filtering circuit, the primary side transmitting circuit adopts LCC topology, and a compensating coil is introduced to be reversely connected with a transmitting coil in series, so that a topological circuit is constructed, and constant-voltage and constant-current charging is realized; through parameter design, equivalent mutual inductance of the two topological circuits is kept constant during offset, and output fluctuation is slowed down; the compensation coil is used for increasing an energy transmission loop, equivalent mutual inductance of the two topological circuits is kept constant through mutual inductance difference, anti-offset constant voltage and constant current output is achieved, a high-precision sensor and a complex control algorithm are not needed, system complexity and cost are reduced, and stability and practicability are improved. The method can be widely applied to wireless charging of electric vehicles, mobile terminals, automatic guided vehicles and other wireless charging scenes, and the adaptability and user experience of the IPT system are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and in particular to a compensation topology structure of a double-terminal anti-offset output and a parameter construction method thereof. Background Art

[0002] Inductive Power Transfer (IPT) is a technology that realizes wireless transmission of electric energy based on the electromagnetic induction mechanism. In application scenarios such as electric vehicle charging, mobile terminals and automated guided vehicles (AGVS), IPT technology significantly enhances the convenience and safety of use due to its non-direct contact charging characteristics. Compared with traditional wired charging methods, IPT technology not only eliminates the steps of plugging and unplugging cables, saving valuable time for car owners, but also optimizes the spatial layout of charging stations, and is expected to promote the intelligent interconnection between power grids and electric vehicles.

[0003] In dynamic wireless power transmission systems, such as the wireless charging scenario of AGVS, a single transmitter usually corresponds to multiple receivers. In order to ensure that each receiver does not interfere with each other and works independently, a suitable compensation network needs to be designed to keep the transmitting coil current constant under dynamic conditions. When the transmitting coil current remains constant, the input of each receiving end can be equivalent to a constant voltage source that is independent of each other, which helps to achieve system stability and reliability.

[0004] However, with the widespread application of wireless power transfer (IPT) technology, the challenges it faces in practical applications have become increasingly prominent, especially the problem of offset between coils. During the charging process of the IPT system, the position deviation of the primary and secondary coils will directly affect the mutual inductance value, thereby causing drastic fluctuations in the output voltage or current, seriously reducing the transmission efficiency, and also threatening the stability of the system. To solve this problem, the current industry has conducted various explorations.

[0005] On the one hand, some researchers are committed to the design innovation of coil structure, and through the development of new coil structures, such as coils with special shapes or layouts, they hope to improve the anti-deviation performance of the system. Although these designs have shown certain effects in specific scenarios, they are often accompanied by increased design complexity and rising manufacturing costs, which limits their widespread application.

[0006] On the other hand, from the perspective of optimizing the energy transmission path, researchers have tried to enhance the system's adaptability to coil offset by introducing additional energy transfer paths or intermediate conversion links. However, these methods usually increase the overall complexity of the system and may introduce additional energy loss, which to some extent limits their promotion in practical applications.

[0007] In the prior art, for example, CN115276257A discloses an integrated compensation structure for realizing constant current and constant voltage for wireless charging of electric vehicles; the structure constructs a topological structure of a constant voltage and constant current charging mode switched by a switch, and obtains an output gain under satisfactory conditions according to the self-inductance and mutual inductance parameters set by the topological structure and the compensation topology. However, although this scheme can realize constant current charging and constant voltage charging, each mode can only provide one output, and dual-port output cannot be realized at the same time. In addition, it can have a certain anti-offset capability for a small range of coil offset, but once the coil offset is too large, the system no longer has the anti-offset capability; at the same time, the switching of the charging mode will be accompanied by device loss, which increases the loss of the system.

[0008] To sum up, although the prior art provides a dual-port anti-offset output solution for the IPT system, it does not conduct in-depth research on the anti-offset characteristics of the dual-port output; therefore, the present invention proposes a compensation topology structure of a dual-port anti-offset output and a parameter construction method thereof, aiming to solve the problems of large output voltage and output current fluctuations and power reduction caused by the coil offset process of the dual-port output inductive power transmission IPT system, so as to improve the system's anti-offset capability and stability. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a double-ended anti-offset output compensation topology structure and a parameter construction method thereof, so as to solve the problem of large output voltage and output current fluctuations and power reduction caused by coil offset in a double-ended output inductive power transmission (IPT) system.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a double-terminal anti-offset output compensation structure, including a DC power supply, a DC power supply connected in series with a full-bridge inverter circuit, the full-bridge inverter circuit provides high-frequency AC power for a primary transmitting circuit, the primary transmitting circuit is composed of a primary compensation inductor, a primary series compensation capacitor, a primary parallel compensation capacitor, a transmitting coil and a compensation coil connected in series and parallel, the transmitting coil and the compensation coil are connected in reverse series, and also include a first secondary receiving circuit and a second secondary receiving circuit that provide input current and input voltage to the first rectifying and filtering circuit and the second rectifying and filtering circuit respectively.

[0011] In a preferred embodiment, the first secondary receiving circuit includes a first secondary receiving coil and a first secondary compensation capacitor, and the second secondary receiving circuit includes a second secondary receiving coil, a second secondary series compensation capacitor, a second secondary parallel compensation capacitor and a second secondary compensation inductor.

[0012] In a preferred embodiment, the two ends of the primary transmitting circuit are connected to the two ends of the output of the full-bridge inverter circuit, the two ends of the output of the first secondary receiving circuit are connected to the two ends of the input of the first rectifier and filter circuit, and the two ends of the output of the second secondary receiving circuit are connected to the two ends of the input of the second rectifier and filter circuit.

[0013] In a preferred solution, one end of the primary compensation inductor is connected to one end of the full-bridge inverter circuit, the other end of the primary compensation inductor is simultaneously connected to one end of the primary parallel compensation capacitor and one end of the primary series compensation capacitor, the other end of the primary series compensation capacitor is connected to one end of the compensation coil, the other end of the compensation coil is connected to one end of the transmitting coil, and the other end of the transmitting coil is simultaneously connected to the other end of the primary parallel compensation capacitor and the other end of the full-bridge inverter circuit.

[0014] In a preferred scheme, one end of the first secondary side receiving coil is connected to one end of the first secondary side compensation capacitor, the other end of the first secondary side receiving coil is connected to one end of the rectifier and filter circuit, the other end of the first secondary side compensation capacitor is connected to the other end of the rectifier and filter circuit, one end of the second secondary side receiving coil is connected to one end of the first secondary side series compensation capacitor, the other end of the second secondary side receiving coil is connected to one end of the second secondary side parallel compensation capacitor, and both are connected to one end of the rectifier and filter circuit, the other end of the second secondary side series compensation capacitor is connected to the other end of the second secondary side parallel compensation capacitor, and both are connected to one end of the second secondary side compensation inductor, and the other end of the second secondary side compensation inductor is connected to the other end of the rectifier and filter circuit.

[0015] In a preferred embodiment, the primary transmitting coil and the primary compensating coil are mutually inductance coils with different ends, the primary transmitting coil and the first secondary receiving coil and the second secondary receiving coil are mutually inductance coils with the same end, and the primary compensating coil and the first secondary receiving coil and the second secondary receiving coil are mutually inductance coils with different ends.

[0016] In a preferred embodiment, the primary transmitting circuit is combined with the first secondary receiving circuit and the second secondary receiving circuit to form an LCC-LC topology circuit and an LCC-LCC topology circuit respectively. The output end of the first secondary receiving circuit can output a constant current, and the output end of the second secondary receiving circuit can output a constant voltage.

[0017] In a preferred solution, the primary transmitting coil, the primary compensating coil, the first secondary receiving coil and the second secondary receiving coil are all wound on a magnetic core using Litz wire, and the magnetic core is made of magnetic conductive material.

[0018] A method for constructing parameters of a dual-end anti-skew output compensation structure adopts any one of the dual-end anti-skew output compensation structures described above, and the method comprises the following steps: Step 1: Determine the system operating angular frequency, the compensation structure input voltage, the load of the first rectifier and filter circuit, the load of the second rectifier and filter circuit, and the equivalent impedance of the first rectifier and filter circuit and the equivalent impedance of the second rectifier and filter circuit according to actual needs; Step 2: Determine the self-inductance and mutual inductance of each coil; Step 3: Write Kirchhoff's Voltage Law equation according to the system resonance requirements, and solve the input current, the output voltage of the first secondary receiving circuit, and the output current of the second secondary receiving circuit; Step 4: Based on the actual system coil parameters, the values ​​of each compensation capacitor are obtained through parameter design.

[0019] The present invention provides a dual-terminal anti-offset output compensation structure and a parameter construction method thereof, which have the following beneficial effects: 1. The present invention constructs an IPT (inductive wireless power transmission) system of a single transmitting coil and a dual receiving coil through an LCC-LC topology circuit and an LCC-LCC topology circuit. This design simultaneously realizes the constant voltage charging and constant current charging functions of the IPT system, meeting the charging requirements of different devices; through the optimization of parameters, the two charging modes can operate without interfering with each other, thereby improving the compatibility and stability of the system; 2. The present invention introduces a compensation coil to increase the energy transmission loop. This design helps to improve the energy transmission efficiency of the system. The compensation coil is connected in series with the transmitting coil in reverse, and the difference in mutual inductance between them and the receiving coil is used to respectively constant the equivalent mutual inductance of the LCC-LC topology circuit and the LCC-LCC topology circuit. This design enables the system to have anti-offset constant voltage charging and constant current charging capabilities while maintaining efficient energy transmission; 3. The present invention enables the system to achieve constant current output and constant voltage output under different load conditions through reasonable parameter design. This feature further improves the stability and practicality of the system, enabling the system to adapt to the charging needs of different devices; 4. The present invention adjusts the mutual inductance difference to keep the equivalent mutual inductance of the two topological circuits constant, thereby slowing down the fluctuation of the output current. This design effectively solves the problem of excessive changes in output current and output voltage caused by excessive coil offset, and improves the system's anti-offset capability; 5. The technical solution of the present invention does not require high-precision sensors and complex control algorithms. This feature reduces the complexity and cost of the system and makes the system easier to implement and maintain. 6. The present invention effectively solves the problem that the offset between coils in the wireless power transmission system will cause the change of the mutual inductance value, thereby causing the violent fluctuation of the output voltage or current, by introducing the compensation coil and constructing a double-end anti-offset output compensation structure; at the same time, the transmission efficiency of the system is improved and the stability of the system is enhanced; 7. The present invention further improves the performance of the system by optimizing parameter design, including selecting appropriate parameters such as coil turns and capacitance value, to ensure that the system can operate stably under various conditions; at the same time, this optimization also helps to reduce system losses and improve energy transmission efficiency; 8. The present invention effectively solves the problem caused by coil offset in the wireless power transmission system by introducing a compensation coil and constructing a compensation structure with double-end anti-offset output; at the same time, by optimizing parameter design and adopting dual-topology circuits to achieve dual-mode charging and other innovations, the stability, practicality and energy transmission efficiency of the system are further improved; 9. With its unique wireless power transmission technology, the present invention not only perfectly adapts to the needs of wireless charging of electric vehicles, but is also widely applicable to a variety of wireless power supply scenarios including mobile terminals and automatic guided vehicles, showing strong versatility and wide application potential, indicating its unlimited possibilities in the field of energy transmission in the future; 10. The present invention utilizes a single transmitting circuit and a dual receiving circuit solution to construct an LCC-LC topology circuit and an LCC-LCC topology circuit to simultaneously realize constant voltage and constant current charging, and introduces a compensation coil to increase the power transmission loop, and then utilizes the mutual inductance difference between the compensation coil and the transmitting coil to reduce the fluctuation of the equivalent mutual inductance during the offset process, thereby making the output current and output voltage have anti-offset capabilities, thereby improving the system's anti-offset capability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples: Figure 1 is a schematic diagram of a wireless power transmission system of the present invention; Figure 2 It is a schematic diagram of a double-terminal compensation topology circuit of the present invention; Figure 3 A schematic diagram of the change of mutual inductance when the magnetic coupling structure of the present invention is offset; Figure 4 A schematic diagram of input voltage and input current of the wireless power transmission system of the present invention; Figure 5 The wireless charging system of the present invention outputs current when the magnetic coupling structure is not offset and output voltage Schematic diagram of changes; Figure 6 Output current of the wireless charging system of the present invention under different load conditions and output voltage Schematic diagram of changes; Figure 7 Output current when the wireless charging system of the present invention is offset by 80 mm and output voltage Schematic diagram of changes; Figure 8 Output current of the wireless charging system of the present invention when it is offset by 140 mm and output voltage Schematic diagram of changes; In the figure: a DC power supply 1, a full-bridge inverter circuit 2, a primary transmitting circuit 3, a first secondary receiving circuit 4, a second secondary receiving circuit 5, a first rectifying and filtering circuit 6, and a second rectifying and filtering circuit 7. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: Example 1 like Figure 1 As shown, a double-terminal anti-offset output compensation structure includes a DC power supply 1, the DC power supply 1 is connected in series with a full-bridge inverter circuit 2, the full-bridge inverter circuit 2 provides high-frequency AC power for a primary transmitting circuit 3, and the primary transmitting circuit 3 includes a primary compensation inductor connected in series and in parallel , primary side series compensation capacitor , primary parallel compensation capacitor , Transmitting coil and compensation coil , where the transmitting coil With compensation coil The first secondary receiving circuit 4 includes a first secondary receiving coil connected in series. and the first secondary compensation capacitor The second secondary receiving circuit 5 comprises a second secondary receiving coil connected in series and in parallel , the second secondary side series compensation capacitor , the second secondary side parallel compensation capacitor and the second secondary compensation inductor The first secondary receiving circuit 4 and the second secondary receiving circuit 5 respectively increase the input current and the input voltage for the first rectifying and filtering circuit 6 and the second rectifying and filtering circuit 7.

[0022] In this embodiment, the two ends of the primary transmitting circuit 3 are connected to the two ends of the output of the full-bridge inverter circuit 2, the two ends of the output of the first secondary receiving circuit 4 are respectively connected to the two ends of the input of the first rectifier and filter circuit 6, and the two ends of the output of the second secondary receiving circuit 5 are respectively connected to the two ends of the input of the second rectifier and filter circuit 7.

[0023] Furthermore, the primary compensation inductor One end is connected to one end of the full-bridge inverter circuit 2, and the primary compensation inductor The other end is connected in parallel with the primary side to compensate for the capacitor One end and the primary side are connected in series with a compensation capacitor One end is connected, and the primary side is connected in series with a compensation capacitor The other end is connected to the compensation coil One end is connected to the compensation coil The other end is connected to the transmitting coil One end is connected to the transmitting coil The other end is connected in parallel with the primary side to compensate for the capacitor The other end is connected to the other end of the full-bridge inverter circuit 2.

[0024] Furthermore, the first secondary receiving coil One end and the first secondary compensation capacitor One end is connected to the first secondary receiving coil The other end is connected to one end of the first rectifier filter circuit 6, and the first secondary compensation capacitor The other end is connected to the other end of the first rectifier filter circuit 6, and the second secondary receiving coil One end is connected in series with the first secondary side compensation capacitor One end is connected to the second secondary receiving coil The other end is connected in parallel with the second secondary side to compensate for the capacitor One end is connected to the second rectifier filter circuit 7, and the second secondary side is connected in series with a compensation capacitor. The other end is connected in parallel with the second secondary side to compensate for the capacitor The other end is connected to the second secondary compensation inductor One end is connected, and the second secondary side compensates the inductance The other end is connected to the other end of the second rectifying and filtering circuit 7.

[0025] Furthermore, the primary transmitting coil With primary compensation coil The mutual inductance coils at opposite ends and the primary transmitting coil With the first secondary receiving coil and the second secondary receiving coil They are all mutual inductance coils with the same end, and primary compensation coils With the first secondary receiving coil and the second secondary receiving coil They are all mutually inductance coils with opposite ends.

[0026] Furthermore, the primary transmitting circuit 3 is respectively combined with the first secondary receiving circuit 4 and the second secondary receiving circuit 5 to form an LCC-LC topology circuit and an LCC-LCC topology circuit, and the output end of the first secondary receiving circuit 4 can output a constant current, and the output end of the second secondary receiving circuit 5 can output a constant voltage.

[0027] Furthermore, the primary transmitting coil , primary compensation coil , the first secondary receiving coil and the second secondary receiving coil Both are wound on the magnetic core with Litz wire, and the magnetic core is made of magnetic conductive material.

[0028] Example 2 In another preferred embodiment, based on Embodiment 1, a parameter construction method of a dual-end anti-skew output compensation structure is to use a dual-end anti-skew output compensation structure described in any one of Embodiments 1, and the method comprises the following steps: Step 1: Determine the system operating angular frequency according to actual needs , compensation structure input voltage , the load of the first rectifier and filter circuit and the load of the second rectifier filter circuit , and the equivalent impedance of the first rectifier filter circuit And the equivalent impedance of the second rectifier filter circuit ; Step 2: Determine the primary compensation inductance , transmitting coil , compensation coil , the first secondary receiving coil and the second secondary receiving coil Self-inductance, primary transmitting coil Respectively with the first secondary receiving coil , the second secondary receiving coil Mutual inductance and , primary transmitting coil With compensation coil Mutual inductance ;; Step 3: According to the requirements of system resonance, write Kirchhoff's Voltage Law equation for LCC-LC topology circuit and LCC-LCC topology circuit. The equation is as follows: (1) In the formula, is the primary parallel compensation capacitor, is the primary side series compensation capacitor, is the first secondary side series compensation capacitor, For the second secondary compensation inductor, The second secondary side series compensation capacitor is connected. is the parallel compensation capacitor of the second secondary side, is the imaginary number symbol, is the input current of the primary transmitting circuit 3, is the output current flowing through the first secondary receiving coil, is the output voltage of the first secondary side receiving circuit 4, is the current flowing through the second secondary receiving coil, Output current for the second secondary side receiving circuit 5; After the following conditions are met: (2) The input current in equation (1) can be solved as , the output voltage of the first secondary receiving circuit , the output current of the second secondary receiving coil The expression is as follows: (3) Obviously, the output voltage of the first secondary receiving circuit is and the output current of the second secondary receiving coil In the process of offset, only the mutual inductance and So just keep and That's it; Define the first equivalent mutual inductance and the second equivalent mutual inductance for: Define the first equivalent mutual inductance and the second equivalent mutual inductance for: (4) (5) Step 4: Combined with the actual system coil parameters, and through reasonable parameter design, the value of each compensation capacitor can be obtained as (6).

[0029] Example 3 In another preferred embodiment, based on the above embodiments 1 and 2, refer to the attached Figure 2 and Figure 3 , The dual-end anti-offset output compensation structure is described. By constructing a primary-side LCC topology circuit, two secondary-side LC and LCC topology circuits are constructed respectively. The two receiving coils used in the secondary side use self-decoupling coils to independently control the secondary-side LC topology circuit and the LCC topology circuit, so that two LCC-LC topology circuits and LCC-LCC topology circuits that do not interfere with each other can be obtained. A compensation coil is introduced into the primary-side LCC topology circuit, and two equivalent mutual inductances are constructed respectively by using the compensation coil in reverse series with the transmitting coil. Therefore, the dual-end output anti-offset characteristic of the system can be achieved by only keeping the equivalent mutual inductance constant during the offset.

[0030] Secondly, the present invention will use a cross-shaped spiral coil at the receiving end of the system. This type of coil can realize the cross-inductance self-coupling between the coils through reasonable design, so the present invention will not involve equivalent mutual inductance. , Figure 2 The schematic diagram of the double-terminal compensation topology circuit of the present invention is shown in FIG. The circuit theory is analyzed and Kirchhoff's Voltage Law equation is written to obtain: According to the requirements of system resonance, Kirchhoff's Voltage Law equation is written for the first compensation topology circuit and the second compensation topology circuit, and the equation is as follows: (1) After the following conditions are met: (2) The input current in equation (1) can be solved as , the output voltage of the first secondary receiving circuit , the output current of the second secondary receiving coil The expression is as follows: (3) Obviously, the output voltage of the first secondary receiving circuit is and the output current of the second secondary receiving coil In the process of offset, only the mutual inductance and So just keep and That's it; Define the first equivalent mutual inductance and the second equivalent mutual inductance for: (4) (5) Step 4: Combined with the actual system coil parameters, and through reasonable parameter design, the value of each compensation capacitor can be obtained as (6).

[0031] Example 4 In another preferred embodiment, based on the above embodiments 1, 2, and 3, in order to verify the feasibility of the present invention, the compensation structure of the double-terminal anti-offset output proposed in the present invention is experimentally verified, and the specific parameters are shown in Table 1:

[0032] Depend on Figure 3 The fluctuation of each mutual inductance within the 140mm offset range is shown. Since the compensation coil and the transmitting coil are two coils of the same type with different numbers of turns, and the coils are stacked up and down, the mutual inductance can be seen. and The change trend of is almost the same, which makes the equivalent mutual inductance of the LCC-LC topology circuit The fluctuation is very small. Similarly, the equivalent mutual inductance of the LCC-LCC topology circuit The fluctuation is also very small, so the solution proposed by the present invention is verified: by introducing a compensation coil in series with the transmitting coil The equivalent mutual inductance of the two topological circuits can be kept constant.

[0033] Depend on Figure 4 It can be seen that when the input voltage is 51.24V, the input current is 11.26A, which meets the theoretical input current effective value. At the same time, the input voltage and the output current are almost in phase, so the hybrid compensation topology structure of the present invention meets the condition of ZPA=0.

[0034] Figure 5 and Figure 7 The output current and output voltage waveforms are shown when the coil is not offset and when the coil is offset by 80mm and 140mm respectively. Obviously, when the coil is not offset, the output voltage is 23.54V, output current is 9.55A. This parameter is used as the standard parameter to compare the output fluctuation during the offset. Figure 7 It can be seen that when the offset is 80mm, the output voltage of the LCC-LC topology circuit is The output current of the LCC-LCC topology circuit is 21.67V. It is 9.98A. Obviously, there is no big fluctuation in both outputs. When the coil is offset to 140mm, the output voltage of the LCC-LC topology circuit is The output current of the LCC-LCC topology circuit is 20.92V. The current of the two outputs is 10.54A, and the fluctuations of the two outputs are still within the allowable fluctuation range, which fully proves that the solution proposed in the present invention can not only realize dual-end output at the same time, but also make them both have anti-offset characteristics.

[0035] Depend on Figure 6 It can be seen that when the two loads and At the same time, when the output current changes from 5Ω to 20Ω, The effective value varies between 9.55A and 8.65A, and the output current fluctuation rate is 9.42%, which is within the range allowed by the system. Therefore, it can be considered that the output voltage of the LCC-LC topology circuit is and the output current of the LCC-LCC topology circuit It hardly changes with the load, and the system achieves a constant current output that is independent of the load.

[0036] In a preferred solution, the first secondary receiving circuit 4 includes a first secondary receiving coil and a first secondary compensation capacitor, and the second secondary receiving circuit 6 includes a second secondary receiving coil, a second secondary series compensation capacitor, a second secondary parallel compensation capacitor, and a second secondary compensation inductor; the above configuration can achieve flexible matching of different load requirements and improve energy transmission efficiency. The first secondary receiving circuit 4 is suitable for low-power loads, while the second secondary receiving circuit 6 optimizes the transmission performance of high-power loads through a more complex compensation network.

[0037] In the preferred scheme, the two ends of the primary transmitting circuit 3 are connected to the two ends of the output of the full-bridge inverter circuit 2, the two ends of the output of the first secondary receiving circuit 4 are respectively connected to the two ends of the input of the first rectifier and filter circuit 6, and the two ends of the output of the second secondary receiving circuit 5 are respectively connected to the two ends of the input of the second rectifier and filter circuit 7; the above settings ensure the voltage stability of the dual-end output and effectively resist the offset phenomenon; at the same time, the full-bridge inverter circuit 2 adjusts the output through the PWM (Pulse Width Modulation) control strategy, which further improves the efficiency and response speed of the entire compensation structure.

[0038] In the preferred scheme, one end of the primary compensation inductor is connected to one end of the full-bridge inverter circuit 2, the other end of the primary compensation inductor is simultaneously connected to one end of the primary parallel compensation capacitor and one end of the primary series compensation capacitor, the other end of the primary series compensation capacitor is connected to one end of the compensation coil, the other end of the compensation coil is connected to one end of the transmitting coil, and the other end of the transmitting coil is simultaneously connected to the other end of the primary parallel compensation capacitor and the other end of the full-bridge inverter circuit 2; the above arrangement realizes effective anti-offset compensation for double-end output and improves the stability and efficiency of energy transmission; wherein, the coordinated use of the primary compensation inductor and the capacitor effectively reduces the energy loss caused by offset, and the ingenious connection of the compensation coil and the transmitting coil further enhances the anti-offset capability of the system.

[0039] In the preferred scheme, one end of the first secondary side receiving coil is connected to one end of the first secondary side compensation capacitor, the other end of the first secondary side receiving coil is connected to one end of the first rectifier and filter circuit 6, the other end of the first secondary side compensation capacitor is connected to the other end of the first rectifier and filter circuit 6, one end of the second secondary side receiving coil is connected to one end of the first secondary side series compensation capacitor, the other end of the second secondary side receiving coil is connected to one end of the second secondary side parallel compensation capacitor, and both are connected to one end of the second rectifier and filter circuit 7 at the same time, the other end of the second secondary side series compensation capacitor is connected to the other end of the second secondary side parallel compensation capacitor, and both are connected to one end of the second secondary side compensation inductor, and the other end of the second secondary side compensation inductor is connected to the other end of the second rectifier and filter circuit 7; the above arrangement can effectively suppress the voltage offset during double-end output and improve the efficiency and stability of power transmission; the rectifier and filter circuits 6 and 7 respectively output stable direct current to ensure that the load end obtains high-quality power supply, the overall structure is compact, and the system integration and reliability are improved.

[0040] In the preferred scheme, the primary transmitting coil and the primary compensating coil are opposite-end mutual inductance coils, the primary transmitting coil and the first secondary receiving coil and the second secondary receiving coil are the same-end mutual inductance coils, and the primary compensating coil and the first secondary receiving coil and the second secondary receiving coil are opposite-end mutual inductance coils; the above arrangement effectively reduces the energy offset phenomenon during the transmission process, improves the stability and transmission efficiency of the system; at the same time, the compensation structure ensures the balance of the dual-end output through the fine mutual inductance configuration, further improving the overall performance of the wireless power transmission system.

[0041] In the preferred scheme, the primary transmitting circuit 3 is respectively combined with the first secondary receiving circuit 4 and the second secondary receiving circuit 5 to form an LCC-LC topology circuit and an LCC-LCC topology circuit. The output end of the first secondary receiving circuit 4 can output a constant current, and the output end of the second secondary receiving circuit 5 can output a constant voltage. The above settings ensure that the circuit can maintain a stable working state under different load conditions, effectively suppress the output offset problem caused by load changes, improve the reliability and stability of the overall circuit, and meet the application requirements of high-precision and wide-range output.

[0042] In a preferred embodiment, the primary transmitting coil, the primary compensating coil, the first secondary receiving coil and the second secondary receiving coil are all wound on a magnetic core using Litz wire, and the magnetic core is made of magnetic conductive material; the above arrangement makes the electromagnetic coupling between the coils tighter, reduces energy loss, and improves transmission efficiency; at the same time, the use of Litz wire effectively reduces the skin effect under high frequency, further improving the current transmission capacity.

[0043] In summary, the present invention proposes an innovative compensation structure for dual-end anti-offset output and a parameter construction method thereof. The method effectively solves the output voltage and current fluctuation problem caused by coil offset faced by traditional wireless power transmission technology at dual-port output by introducing a compensation coil and optimizing parameter design; the method combines the LCC-LC topology circuit and the LCC-LCC topology circuit to construct an IPT system of a single transmitting coil and a dual receiving coil, while meeting the requirements of constant voltage charging and constant current charging; by utilizing the mutual inductance difference between the compensation coil and the transmitting coil, the present invention reduces the fluctuation of the equivalent mutual inductance during the offset process, which is a factor that is not fully considered in traditional designs; in practical applications, the present invention adopts a combination of actual measurement and theoretical calculation to accurately design and optimize the parameters of each component of the compensation structure, thereby realizing the system's anti-offset constant current output and constant voltage output; in addition, the method also minimizes the fluctuation of the equivalent mutual inductance of the LCC-LC topology circuit and the LCC-LCC topology circuit during offset, thereby effectively reducing the output gain offset fluctuation rate of the two topology circuits. This innovation not only improves the stability and reliability of the system, but also expands the application scope of the two-end compensation topology, provides a new design idea for the two-end output solution, and transfers the parameter optimization of the coil to the parameter optimization of the compensation topology, which greatly simplifies the complexity of the system design. The experimental verification results further prove the feasibility and practicality of the invention, and provide strong technical support for subsequent practical applications.

Claims

1. A double-ended anti-offset output compensation structure, characterized in that: The invention comprises a direct current power supply (1), the direct current power supply (1) is connected in series with a full-bridge inverter circuit (2), the full-bridge inverter circuit (2) provides high-frequency alternating current for a primary transmitting circuit (3), the primary transmitting circuit (3) is composed of a primary compensation inductor, a primary series compensation capacitor, a primary parallel compensation capacitor, a transmitting coil and a compensation coil connected in series and parallel, the transmitting coil and the compensation coil are connected in series in reverse order, and also comprises a first secondary receiving circuit (4) and a second secondary receiving circuit (5) which respectively provide input current and input voltage for a first rectifying and filtering circuit (6) and a second rectifying and filtering circuit (7).

2. The double-ended anti-skew output compensation structure according to claim 1, characterized in that: The first secondary side receiving circuit (4) comprises a first secondary side receiving coil and a first secondary side compensation capacitor, and the second secondary side receiving circuit (6) comprises a second secondary side receiving coil, a second secondary side series compensation capacitor, a second secondary side parallel compensation capacitor and a second secondary side compensation inductor.

3. The double-ended anti-skew output compensation structure according to claim 2, characterized in that: The two ends (3) of the primary transmitting circuit are connected to the two ends of the output of the full-bridge inverter circuit (2), the two ends of the output of the first secondary receiving circuit (4) are connected to the two ends of the input of the first rectifying and filtering circuit (6), and the two ends of the output of the second secondary receiving circuit (5) are connected to the two ends of the input of the second rectifying and filtering circuit (7).

4. The double-ended anti-skew output compensation structure according to claim 3, characterized in that: One end of the primary compensation inductor is connected to one end of the full-bridge inverter circuit (2), the other end of the primary compensation inductor is simultaneously connected to one end of the primary parallel compensation capacitor and one end of the primary series compensation capacitor, the other end of the primary series compensation capacitor is connected to one end of the compensation coil, the other end of the compensation coil is connected to one end of the transmitting coil, and the other end of the transmitting coil is simultaneously connected to the other end of the primary parallel compensation capacitor and the other end of the full-bridge inverter circuit (2).

5. The double-ended anti-skew output compensation structure according to claim 4, characterized in that: One end of the first secondary receiving coil is connected to one end of the first secondary compensation capacitor, the other end of the first secondary receiving coil is connected to one end of the first rectifier filter circuit (6), the other end of the first secondary compensation capacitor is connected to the other end of the first rectifier filter circuit (6), one end of the second secondary receiving coil is connected to one end of the first secondary series compensation capacitor, the other end of the second secondary receiving coil is connected to one end of the second secondary parallel compensation capacitor, and both are connected to one end of the second rectifier filter circuit (7), the other end of the second secondary series compensation capacitor is connected to the other end of the second secondary parallel compensation capacitor, and both are connected to one end of the second secondary compensation inductor, and the other end of the second secondary compensation inductor is connected to the other end of the second rectifier filter circuit (7).

6. The double-ended anti-skew output compensation structure according to claim 5, characterized in that: The transmitting coil and the compensating coil are mutually inductive coils with different names, the transmitting coil and the first secondary receiving coil and the second secondary receiving coil are mutually inductive coils with the same names, and the compensating coil and the first secondary receiving coil and the second secondary receiving coil are mutually inductive coils with different names.

7. The double-ended anti-skew output compensation structure according to claim 6, characterized in that: The primary-side transmitting circuit (3) is respectively combined with the first secondary-side receiving circuit (4) and the second secondary-side receiving circuit (5) to form an LCC-LC topology circuit and an LCC-LCC topology circuit, which respectively output a constant current and a constant voltage.

8. The double-ended anti-skew output compensation structure according to claim 7, characterized in that: The transmitting coil, the compensating coil, the first secondary receiving coil and the second secondary receiving coil are all wound on a magnetic core made of a magnetic conductive material using Litz wire.

9. A method for constructing parameters of a compensation structure for a double-ended anti-offset output, characterized in that: A double-ended anti-offset output compensation structure according to any one of claims 1 to 8 is adopted, and the method comprises the following steps: Step 1: Determine the system operating angular frequency, the compensation structure input voltage, the load of the first rectifier and filter circuit (6) and the load of the second rectifier and filter circuit (7), and the equivalent impedance of the first rectifier and filter circuit (6) and the equivalent impedance of the second rectifier and filter circuit (7) according to actual needs; Step 2: Determine the self-inductance and mutual inductance of each coil; Step 3: Write Kirchhoff's Voltage Law equation according to the system resonance requirements, and solve the input current, the output voltage of the first secondary receiving circuit (4), and the output current of the second secondary receiving circuit (5); Step 4: Based on the actual system coil parameters, the values ​​of each compensation capacitor are obtained through parameter design.

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