Control method and device of wireless power transmission system, equipment and storage medium

Abstract

The embodiment of the invention discloses a control method and device of a wireless power transmission system, equipment and a storage medium, the wireless power transmission system at least comprises a transmitting end and a receiving end which are in communication connection, and the method is applied to the receiving end. The method comprises the steps of obtaining an output voltage of a receiving end, an output voltage reference value and an estimated value of a first pulse density instruction of a transmitting end, wherein the output voltage is used for reflecting voltages at two ends of a to-be-powered load; determining an internal control quantity by using the output voltage, the output voltage reference value and a preset proportional-integral controller; determining a second pulse density instruction of the receiving end according to the estimated value and the internal control quantity; and sending the second pulse density instruction to the transmitting end. The power efficiency decoupling control method is realized through the method, the pulse density of the transmitting end can follow the receiving end, the interference of maximum efficiency tracking on voltage control is avoided, and the speed of the MEPT is improved.

Description

Technical Field

[0001] This invention relates to the field of wireless power transmission technology, and in particular to a control method, apparatus, device, and storage medium for a wireless power transmission system. Background Technology

[0002] Low energy efficiency is a major bottleneck in current Wireless Power Transfer (WPT) systems. While a well-designed WPT system can maintain high efficiency at specific operating points, its efficiency can drop significantly when coupling and load conditions deviate. To address this issue, researchers have proposed various control methods to dynamically optimize energy transfer efficiency in response to changes in coupling and load conditions; these methods are often referred to as Maximum Efficiency Point Tracking (MEPT) control.

[0003] The fundamental idea of ​​MEPT (Multi-Purpose Power Transmission) is to maintain an optimal proportional relationship between the amplitudes of the coupler resonant currents in order to transmit the required power with minimal total resistance (and hysteresis) losses. This idea can be achieved through two-sided power conversion. Furthermore, MEPT requires a closed-loop dynamic control system to operate correctly. Existing research provides key support for this control system. First, the dynamic characteristics of MEPT have been accurately modeled using Generalized State-Space Averaging (GSSA) and dynamic phasor methods. Second, MEPT employs a Perturb and Observe (P&O) algorithm or voltage ratio control to overcome parameter uncertainties and variations. The P&O algorithm is more robust, while voltage ratio control is faster and more stable. Wireless data links can be established between the power transmitter and receiver using various communication technologies to achieve bilateral cooperation.

[0004] Existing MEPT control is based on voltage closed-loop control. To reduce the impact on the voltage closed loop, MEPT using the P&O algorithm often has a small step size and a long settling measurement time, while MEPT using voltage ratio control has a much lower speed than voltage closed-loop control. Although these methods ensure control stability, they are difficult to handle situations with dynamically changing parameters. That is, when coupling or load conditions change continuously, existing MEPT methods struggle to quickly track the point of maximum efficiency.

[0005] In summary, existing control methods, such as maximum efficiency tracking control based on disturbance observation, usually treat efficiency control as a disturbance to power control. These methods often have slow control speed or continuous small fluctuations. Summary of the Invention

[0006] The main objective of this invention is to provide a control method, apparatus, device, and storage medium for a wireless power transmission system, which can solve the problem of slow control speed in existing control methods.

[0007] To achieve the above objectives, a first aspect of the present invention provides a control method for a wireless power transmission system, the wireless power transmission system comprising at least a transmitter and a receiver having a communication connection, the method being applied to the receiver, the method comprising:

[0008] The output voltage of the receiving end, the output voltage reference value, and the estimated value of the first pulse density command of the transmitting end are obtained. The output voltage is used to reflect the voltage across the load to be powered.

[0009] The internal control quantity is determined using the output voltage, the output voltage reference value, and the preset proportional-integral controller.

[0010] The second pulse density command of the receiving end is determined based on the estimated value and the internal control quantity;

[0011] The second pulse density command is sent to the transmitting end.

[0012] In one feasible implementation, determining the second pulse density command of the receiving end based on the estimated value and the internal control quantity includes:

[0013] The initial second pulse density command is determined by dividing the internal control quantity by the estimated value.

[0014] The initial second pulse density command is subjected to amplitude limiting processing according to a preset amplitude range to obtain the second pulse density command.

[0015] In one feasible implementation, the proportional-integral controller is an anti-saturation proportional-integral controller. Then, determining the internal control quantity using the output voltage, the output voltage reference value, the estimated value, and the preset proportional-integral controller includes:

[0016] Determine the difference between the output voltage and the output voltage reference value;

[0017] The difference is input into the anti-saturation proportional-integral controller for anti-saturation processing to determine the internal control quantity.

[0018] In one feasible implementation, obtaining an estimate of the first pulse density command from the transmitting end includes:

[0019] The system receives the output value of a dynamic simulator via a preset communication link. The output value includes the estimated value, and the input of the dynamic simulator includes at least a second pulse density command.

[0020] In one feasible implementation, the mathematical expression for the control parameters of the proportional-integral controller is as follows:

[0021]

[0022] In the formula, k min For the minimum value of k, k p and k i ω is the control parameter of the proportional-integral controller. s Where M is the switching frequency, M is the mutual inductance coefficient, L1 and L2 are the resonant inductances of the transmitter and receiver, respectively, and C is the switching frequency. f V1 is the filter capacitor, and R is the DC voltage at the emitter. Lmin This represents the minimum value of the load to be powered.

[0023] To achieve the above objectives, a second aspect of the present invention provides a control method for a wireless power transmission system, the wireless power transmission system comprising at least a transmitter and a receiver having a communication connection, the method being applied to the transmitter, and the receiver being configured to perform the steps of the method as shown in the first aspect and any feasible implementation thereof, the method comprising:

[0024] Obtain the second pulse density command sent by the receiving end;

[0025] The first pulse density command of the transmitting end is determined by performing maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command.

[0026] To achieve the above objectives, a third aspect of the present invention provides a control device for a wireless power transmission system, the wireless power transmission system comprising at least a transmitter and a receiver having a communication connection, the device being applied to the receiver, the device comprising:

[0027] Data acquisition module: used to acquire the output voltage of the receiving end, the output voltage reference value, and the estimated value of the first pulse density command of the transmitting end, wherein the output voltage is used to reflect the voltage across the load to be powered;

[0028] First determining module: used to determine internal control quantities using the output voltage, the output voltage reference value, and a preset proportional-integral controller;

[0029] The second determining module is used to determine the second pulse density command of the receiving end based on the estimated value and the internal control quantity.

[0030] Data transmission module: used to send the second pulse density command to the transmitting end.

[0031] To achieve the above objectives, a third aspect of the present invention provides a control device for a wireless power transmission system, the wireless power transmission system comprising at least a transmitter and a receiver having a communication connection, the device being applied to the transmitter, and the receiver being configured to perform the steps of the method as shown in the first aspect and any feasible implementation thereof, the device comprising:

[0032] Data receiving module: used to acquire the second pulse density command sent by the receiving end;

[0033] The third determining module is used to perform maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command to determine the first pulse density command of the transmitting end.

[0034] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the steps of the method as shown in the first aspect and any feasible implementation, or the steps of the method as shown in the second aspect.

[0035] To achieve the above objectives, a fourth aspect of the present invention provides a computer device including a memory and a processor, the memory storing a computer program, which, when executed by the processor, causes the processor to perform steps of the method as shown in the first aspect and any feasible implementation, or steps of the method as shown in the second aspect.

[0036] The embodiments of the present invention have the following beneficial effects:

[0037] This invention provides a control method for a wireless power transfer system. The wireless power transfer system includes at least a transmitter and a receiver connected by communication. The method is applied to the receiver and includes: acquiring the receiver's output voltage, an output voltage reference value, and an estimated value of a first pulse density command from the transmitter. The output voltage reflects the voltage across the load to be powered. Using the output voltage, the output voltage reference value, and a preset proportional-integral controller, an internal control quantity is determined. Based on the estimated value and the internal control quantity, a second pulse density command from the receiver is determined. The second pulse density command is then sent to the transmitter. This method achieves a power efficiency decoupling control method. The receiver can estimate the first pulse density command from the transmitter, determine the second pulse density command using the estimated value, and send the second pulse density command to the transmitter. The transmitter's pulse density follows the receiver's, compensating for the transmitter's control's influence on the output voltage. This further linearizes the voltage closed loop, avoiding interference from maximum efficiency tracking (MEPT) on voltage control. The speed of MEPT is not constrained by the closed-loop system bandwidth, enabling rapid efficiency optimization. This method is suitable for applications with rapidly changing coupling or load conditions, such as dynamic wireless charging systems, significantly improving the speed of MEPT. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] in:

[0040] Figure 1 This is an application environment diagram of a control method for a wireless power transmission system according to an embodiment of the present invention;

[0041] Figure 2 This is a structural diagram of a magnetic resonance wireless power transfer system according to an embodiment of the present invention;

[0042] Figure 3 This is a flowchart of a control method for a wireless power transmission system at a receiving end according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of a control method according to an embodiment of the present invention;

[0044] Figure 5 This is a flowchart of a control method for a wireless power transmission system at a transmitter, according to an embodiment of the present invention.

[0045] Figure 6 The frequency characteristics of a resonant network in a wireless power transmission system according to an embodiment of the present invention;

[0046] Figure 7 This is a low-frequency equivalent principle diagram of a control method in an embodiment of the present invention;

[0047] Figure 8 The frequency characteristics of the secondary PI controller, switching transfer function, and closed-loop transfer function of a control method in an embodiment of the present invention are shown.

[0048] Figure 9 This is a structural block diagram of a control device for a wireless power transmission system at a receiving end, according to an embodiment of the present invention.

[0049] Figure 10 This is a structural block diagram of a control device for a wireless power transmission system at the transmitting end, according to an embodiment of the present invention.

[0050] Figure 11 This is a structural block diagram of a computer device in an embodiment of the present invention. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Please see Figure 1 , Figure 1 This is an application environment diagram of a control method for a wireless power transmission system according to an embodiment of the present invention, such as... Figure 1 The wireless power transmission system 00 shown includes a transmitter 10 and a receiver 20 with a communication connection. The transmitter 10 and receiver 20 can be electronic devices with data processing capabilities, including but not limited to FPGAs. The transmitter 10 and receiver 20 can establish a communication connection based on a wireless data link. The wireless power transmission system 00 includes, but is not limited to, magnetic resonance wireless power transmission systems. (See also...) Figure 2 , Figure 2 This is a structural diagram of a magnetic resonance wireless power transfer system according to an embodiment of the present invention. Figure 2 Taking the magnetic resonance wireless power transfer system shown as an example, Figure 2 The magnetic resonance wireless power transfer system shown is divided into two parts, the primary side and the secondary side, with the mutual inductance coils as the boundary. The transmitting end 10 can be considered as... Figure 2 The control terminal corresponding to the primary side of the magnetic resonance wireless power transfer system shown is shown. The receiver 20 can be regarded as... Figure 2 The control terminal corresponding to the secondary side of the magnetic resonance wireless power transfer system is shown. The wireless power transfer system 00 is mainly used to provide power to a load wirelessly, such as wireless charging. (Continue reading...) Figure 2 , Figure 2 This can be seen as an example prototype of the wireless power transmission system 00. Figure 2 The medium-power circuit consists of a full-bridge inverter, a magnetically coupled series resonant network, and a full-bridge active rectifier. The resonant inductance, resonant capacitance, and equivalent series resistance of the primary and secondary sides are represented by L1, C1, R1 and L2, C2, R2, respectively. The mutual inductance coefficient is represented by M. The wireless power transfer system 00 is fed by a DC voltage v1 and passes through a filter capacitor C. f To load R L Power supply. It should be noted that, except... Figure 2In addition to the system shown, the control method of the present invention can also be used in wireless power transmission systems with different main circuit topologies, including but not limited to wireless power transmission systems using half-bridge inverters or rectifiers, wireless power transmission systems using pre- or post-DC-DC converters, and wireless power transmission systems using resonant networks such as bilateral LCCs, wherein the transmitter 10 and the receiver 20 can be two FPGAs respectively.

[0053] It should be noted that this application proposes a power efficiency decoupling control method. This method estimates the primary-side control quantity d1' using a dynamic simulator on the secondary side via a communication link. This compensates for the impact of the primary-side control on the output voltage V2, further linearizing the voltage closed-loop and thus avoiding the influence of MEPT on the voltage closed-loop, significantly improving the speed of MEPT. Specifically, the proposed control method uses a conventional PI controller on the secondary side to control the output voltage V2. However, the PI controller's output u is only used as an internal control quantity and does not directly act on the modulator. For a wireless power transfer system using pulse density modulation, the output voltage V2 is proportional to the product of the primary and secondary pulse densities. Therefore, the internal control quantity u is divided by the estimated value d1' of the primary-side pulse density d1, and then limited to a range of 0 to 1 to obtain the secondary-side pulse density command d2. Here, the estimated value d1' of the primary-side pulse density is given by a dynamic simulator embedded in the secondary-side controller via a communication link. The communication link transmits the secondary-side pulse density command d2 to the primary side, causing the primary-side pulse density d1 to follow the secondary-side d2. The above control method can linearize the voltage control loop and decouple it from the maximum efficiency tracking algorithm. The parameters of the PI controller can also be designed based on the linearized model.

[0054] In wireless power transmission systems, efficiency control is typically achieved by adjusting the turns ratio of the secondary converter. However, adjusting the secondary converter inevitably leads to power changes, thus efficiency control and power control are coupled. Existing control methods, such as maximum efficiency tracking control based on disturbance observation, usually treat efficiency control as a disturbance to power control. These methods often exhibit slow control speeds or persistent small fluctuations. This invention addresses this issue through a special design of the controller (rather than the modulator) (embodied in...). Figure 4 By utilizing state observation of the communication link and nonlinear compensation for changes in primary pulse density, power and efficiency control are no longer mathematically coupled, allowing for the independent design of two control loops and the realization of rapid control.

[0055] This invention proposes a power efficiency decoupling control method for magnetic resonance wireless power transfer systems, which linearizes the output voltage control loop and simplifies the design of control parameters. It also avoids interference from maximum efficiency tracking (MET) on voltage control, making MET speed independent of closed-loop system bandwidth constraints, enabling rapid efficiency optimization. This method is suitable for applications with rapidly changing coupling or load conditions, such as dynamic wireless charging systems. Dynamic wireless charging (DWPT) refers to the relative motion between the primary and secondary coupling mechanisms during charging, such as wireless charging of a moving electric vehicle. The following section will use... Figure 2 Combination Figures 3 to 8 Taking an example, the control method of the wireless power transmission system of this application will be described.

[0056] Please see Figure 1 and Figure 3 , Figure 3 This is a flowchart illustrating a control method for a wireless power transmission system at a receiving end according to an embodiment of the present invention. The wireless power transmission system 00 includes at least a transmitting end 10 and a receiving end 20 with a communication connection, such as... Figure 3 The method shown is applied to the receiving end 20, such as Figure 3 The method shown includes the following steps:

[0057] 301. Obtain the output voltage of the receiving end, the output voltage reference value, and the estimated value of the first pulse density command of the transmitting end, wherein the output voltage is used to reflect the voltage across the load to be powered;

[0058] It should be noted that the receiving end needs to obtain the output voltage reference value V2ref, the estimated value d1' of the first pulse density command d1 from the transmitting end, and acquire the output voltage V2 of the receiving end. The estimated value d1' of the first pulse density command d1 from the transmitting end can be obtained by receiving the output value of a dynamic simulator of a preset communication link. This output value includes the estimated value d1', and the input of the dynamic simulator includes at least the second pulse density command d2. That is, this application pre-sets a dynamic simulator of a communication link on the secondary side, thereby estimating the first pulse density command d1 through the dynamic simulator of this communication link. The output voltage reflects the voltage across the load to be powered, and the load to be powered is... Figure 2 The load R shown L .

[0059] 302. Using the output voltage, the output voltage reference value, and the preset proportional-integral controller, determine the internal control quantity;

[0060] Furthermore, after obtaining the output voltage V2 and the output voltage reference value V2ref, the internal control quantity u is determined using the output voltage V2, the output voltage reference value V2ref, and a preset proportional-integral controller (PI controller). Specifically, this proportional-integral controller can be an anti-saturation proportional-integral controller to achieve an anti-saturation effect. Step 302 may include the following steps A1 to A2:

[0061] A1. Determine the difference between the output voltage and the output voltage reference value;

[0062] A2. Input the difference into the anti-saturation proportional-integral controller for anti-saturation processing to determine the internal control quantity.

[0063] It should be noted that after obtaining the output voltage V2 and the output voltage reference value V2ref, the difference between the output voltage V2 and the output voltage reference value V2ref is determined. This difference is then input to the anti-saturation proportional-integral controller for anti-saturation processing, thereby determining the internal control quantity u to prevent subsequent pulse density commands from exceeding the PDM's limiting range. The pulse density modulator can only achieve pulse density values ​​between 0 and 1, while the controller may issue pulse density commands within a wider range. The difference between the two can cause the modulator to saturate; without anti-saturation functionality, this will lead to overshoot.

[0064] Please refer to Figure 4 , Figure 4 This is a schematic diagram of a control method according to an embodiment of the present invention. Figure 4 An example illustrates a feasible control flow for the output voltage, wherein, as Figure 4 The difference between the output voltage reference value V2ref and the actual output voltage V2 measured by the sampling circuit is input to the secondary controller (Control), and then processed by a factor of k. p After being amplified proportionally, it is added to u' after being low-pass filtered to obtain the internal control quantity u. Here, the time constant of the low-pass filter is k. p / k i u' is the product of the estimate d1' of the primary-side pulse density command d1 and the secondary-side pulse density command d2. This internal control quantity u is used to calculate the second pulse density command, but it does not directly act on the PDM modulator.

[0065] It should be noted that, Figure 4 The main circuit of the wireless power transfer system is modeled as a nonlinear system, where G1(s) and G2(s) are the effective values ​​of the secondary resonant currents I from V1*d1 and V2*d2, respectively. L2i The transfer function of can be derived from the following state-space equation (1):

[0066]

[0067] In the formula, I L1r It is the effective value of the primary resonant current, ω s The switching frequency is equal to the resonant frequency on both sides. Figure 6 The frequency characteristics of the resonant network in a wireless power transmission system according to an embodiment of the present invention are shown. Figure 6 The frequency characteristics of G1(s) and G2(s) are shown. Figure 6 Different clusters of real and imaginary lines represent the coupling coefficient k in k .min to k .max The effect of variations between f and f on the frequency response curve of the resonant network is used to illustrate the influence of f. n.min The effect. For different coupling coefficients or mutual inductance coefficients M, the resonance peaks f of G1(s) and G2(s) are... n The positions are also different, f n It can be approximated as the following formula (2):

[0068]

[0069] Among them, at a level far below f n In the frequency band, the resonant network can be approximated as a gyroscope. Figure 4 The control system shown can be simplified to Figure 7 , Figure 7 This is a low-frequency equivalent schematic diagram of a control method according to an embodiment of the present invention, wherein R M As shown in equation (3):

[0070]

[0071] exist Figure 7 In the process, the open-loop system from the internal control quantity u to the output voltage V2 is linearized, and its transfer function is shown in equation (4) below:

[0072]

[0073] For example, Figure 8 The frequency characteristics of the PI controller, its open-loop transfer function, and its closed-loop transfer function are plotted. Figure 8 Different line clusters represent the load R L In R L.min The effect of variations between +∞ on the frequency response curve of the control loop is used to illustrate f. c.max The effect. The zero-crossing frequency f of the gain of the closed-loop transfer function. c It is related to the coupling coefficient and can be expressed as the following equation (5):

[0074]

[0075] To ensure system stability, an appropriate k should be selected.p and k i , making f c Much smaller than f n The following suggestions for k p and k i f can be c Placed at 0.1 times f n The frequency, for example, the mathematical expression (6) of the control parameters of a proportional-integral controller with anti-saturation capability is as follows:

[0076]

[0077] In the formula, k min For the minimum value of k, k p and k i ω is the control parameter of the proportional-integral controller. s Where M is the switching frequency, M is the mutual inductance coefficient, L1 and L2 are the resonant inductances of the transmitter and receiver, respectively, and C is the switching frequency. f V1 is the filter capacitor, and R is the DC voltage at the emitter. Lmin This represents the minimum value of the load to be powered.

[0078] 303. Determine the second pulse density command of the receiving end based on the estimated value and the internal control quantity;

[0079] Furthermore, the second pulse density command at the receiving end can be obtained through the above estimated value and internal control quantity. Specifically, step 303 may include: dividing the internal control quantity u by the estimated value u' to determine the initial second pulse density command d2; and limiting the initial second pulse density command according to a preset amplitude range to obtain the second pulse density command d2. The purpose of setting u' is to achieve a proportional-integral control with anti-saturation function, which can be referred to in [reference missing]. Figure 2 ,Depend on Figure 2 It can be seen that after obtaining d2, d2 is transmitted to the PDM at the receiving end to obtain the drive signal V of the secondary rectifier. g .For example Figure 2 As shown, d2 is transmitted to the PDM at the receiving end to obtain the drive signal V of the secondary rectifier. g—S5-8 .

[0080] Please continue to refer to this. Figure 4 , Figure 4 Output reference value V 2ref The difference between the actual output voltage V2 measured by the sampling circuit and the voltage is input to the secondary controller, and then passed through a multiplier k. p After being amplified proportionally, it is added to u' after being low-pass filtered to obtain the internal control quantity u. Here, the time constant of the low-pass filter is k. p / ki u' is the product of the estimate d1' of the primary-side pulse density command d1 and the secondary-side pulse density command d2. The internal control quantity u is divided by d1', and then limited within the range of 0 to 1 to obtain d2. Here, d1' is given by a dynamic simulator of a communication link, and the simulator's input is d2. Figure 4 In the example, the communication link is modeled as a low-pass filter with a time constant τ. More detailed modeling is possible depending on the actual communication physical layer and primary-side data processing algorithm used; however, this will not be exhaustive here. Because... Figure 2 The wireless power transfer system shown employs pulse density modulation; therefore, the controller output is a pulse density command. For wireless power transfer systems using phase-shift control or DC-DC converter duty cycle control, the controller outputs the phase shift or duty cycle as the control quantity, and its control structure is similar to... Figure 4 The controllers are the same.

[0081] 304. Send the second pulse density command to the transmitting end.

[0082] Finally, the generated second pulse density command is sent to the transmitter so that the primary side follows the secondary side.

[0083] This invention provides a control method for a wireless power transfer system. The wireless power transfer system includes at least a transmitter and a receiver connected by communication. The method is applied to the receiver and includes: acquiring the receiver's output voltage, an output voltage reference value, and an estimated value of a first pulse density command from the transmitter. The output voltage reflects the voltage across the load to be powered. Using the output voltage, the output voltage reference value, and a preset proportional-integral controller, an internal control quantity is determined. Based on the estimated value and the internal control quantity, a second pulse density command from the receiver is determined. The second pulse density command is then sent to the transmitter. This method achieves a power efficiency decoupling control method. The receiver can estimate the first pulse density command from the transmitter, determine the second pulse density command using the estimated value, and send the second pulse density command to the transmitter. The transmitter's pulse density follows the receiver's, compensating for the transmitter's control's influence on the output voltage. This further linearizes the voltage closed loop, avoiding interference from maximum efficiency tracking (MEPT) on voltage control. The speed of MEPT is not constrained by the closed-loop system bandwidth, enabling rapid efficiency optimization. This method is suitable for applications with rapidly changing coupling or load conditions, such as dynamic wireless charging systems, significantly improving the speed of MEPT.

[0084] Please see Figure 5 , Figure 5 This is a flowchart illustrating a control method for a wireless power transmission system at a transmitting end, as described in an embodiment of the present invention. The wireless power transmission system includes at least a transmitting end and a receiving end with a communication connection, such as... Figure 5The method shown is applied to the transmitting end, and the receiving end is used to perform the following: Figure 3 The method shown is as follows: Figure 5 The method shown includes the following steps:

[0085] 501. Obtain the second pulse density command sent by the receiving end;

[0086] 502. Perform maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command to determine the first pulse density command of the transmitting end.

[0087] It should be noted that after receiving the second pulse density command, the receiving end will also transmit the second pulse density command d2 to the transmitting end via the wireless data link, so that the transmitting end can follow the receiving end to perform maximum efficiency tracking processing to determine the first pulse density command of the transmitting end. Specifically, maximum efficiency tracking processing is performed using a preset maximum efficiency tracking algorithm and the second pulse density command to determine the first pulse density command d1 of the transmitting end. See also... Figure 2 ,Depend on Figure 2 It can be seen that after obtaining d1, d1 is transmitted to the PDM at the transmitting end to obtain the drive signal V of the primary-side inverter. g .For example Figure 2 As shown, d1 is transmitted to the PDM at the receiving end to obtain the drive signal V of the secondary rectifier. g—S1-4 .

[0088] For example, see [link / reference] Figure 8 , Figure 8 The frequency characteristics of the secondary PI controller, switching transfer function, and closed-loop transfer function of a control method in an embodiment of the present invention are shown.

[0089] This invention provides a control method for a wireless power transmission system. The wireless power transmission system includes at least a transmitter and a receiver connected by communication. The method is applied to the transmitter, and the receiver executes the steps of the method shown in Figure 3. The method includes: acquiring a second pulse density command sent by the receiver; performing maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command to determine a first pulse density command from the transmitter. This method achieves a power efficiency decoupled control method, where the communication link transmits the secondary-side pulse density command to the primary-side, causing the primary-side pulse density to follow the secondary-side. This control method can linearize the voltage control loop and decouple it from the maximum efficiency tracking algorithm.

[0090] Please see Figure 9 , Figure 9This is a structural block diagram of a control device for a wireless power transmission system at the receiving end, as described in an embodiment of the present invention. The wireless power transmission system includes at least a transmitting end and a receiving end with a communication connection, such as... Figure 9 The device shown is applied to the receiving end, such as Figure 9 The apparatus shown includes:

[0091] Data acquisition module 901: used to acquire the output voltage of the receiving end, the output voltage reference value, and the estimated value of the first pulse density command of the transmitting end, wherein the output voltage is used to reflect the voltage across the load to be powered;

[0092] First determining module 902: used to determine internal control quantities using the output voltage, the output voltage reference value, and a preset proportional-integral controller;

[0093] The second determining module 903 is used to determine the second pulse density command of the receiving end based on the estimated value and the internal control quantity.

[0094] Data transmission module 904: used to send the second pulse density command to the transmitting end.

[0095] It should be noted that, as Figure 9 The function of each module in the device shown is as follows: Figure 3 The steps in the method shown are similar, and will not be repeated here to avoid repetition. For details, please refer to [reference needed]. Figure 3 The content of each step in the method shown.

[0096] This invention provides a control device for a wireless power transmission system. The wireless power transmission system includes at least a transmitter and a receiver connected by communication. The device is applied to the receiver and includes: a data acquisition module for acquiring the output voltage of the receiver, an output voltage reference value, and an estimated value of a first pulse density command from the transmitter, wherein the output voltage reflects the voltage across the load to be powered; a first determination module for determining an internal control quantity using the output voltage, the output voltage reference value, and a preset proportional-integral controller; a second determination module for determining a second pulse density command from the receiver based on the estimated value and the internal control quantity; and a data transmission module for transmitting the second pulse density command to the transmitter. The above-described device achieves a power efficiency decoupling control. The receiver can estimate the value of the first pulse density command from the transmitter, use the estimated value to determine the second pulse density command, and send the second pulse density command to the transmitter. The pulse density of the transmitter follows that of the receiver to compensate for the influence of the transmitter's control on the output voltage, further linearizing the voltage closed loop. This avoids interference from maximum efficiency tracking on voltage control, and makes the speed of maximum efficiency tracking unrestricted by the bandwidth of the closed-loop system. It enables rapid efficiency optimization and is suitable for applications with rapidly changing coupling or load conditions, such as dynamic wireless charging systems, which can significantly improve the speed of MEPT.

[0097] Please see Figure 10 , Figure 10 This is a structural block diagram of a control device for a wireless power transmission system at a transmitting end, as described in an embodiment of the present invention. The wireless power transmission system includes at least a transmitting end and a receiving end with a communication connection, such as... Figure 10 The device shown is applied to the transmitting end, and the receiving end is used to perform the following: Figure 3 The method, such as Figure 10 The apparatus shown includes:

[0098] Data receiving module 1001: used to acquire the second pulse density command sent by the receiving end;

[0099] The third determining module 1002 is used to perform maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command to determine the first pulse density command of the transmitting end.

[0100] It should be noted that, as Figure 10 The functions of each module in the device shown are as follows: Figure 5 The steps in the method shown are similar, and will not be repeated here to avoid repetition. For details, please refer to [reference needed]. Figure 5 The content of each step in the method shown.

[0101] This invention provides a control device for a wireless power transmission system. The wireless power transmission system includes at least a transmitter and a receiver connected by communication. The device is applied to the transmitter, and the receiver is used to execute the steps of the method shown in Figure 3. The device includes: a data receiving module for acquiring a second pulse density command sent by the receiver; and a third determining module for performing maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command to determine a first pulse density command from the transmitter. This device achieves a power efficiency decoupling control, where the communication link transmits the secondary-side pulse density command to the primary-side, causing the primary-side pulse density to follow the secondary-side. This control device can linearize the voltage control loop and decouple it from the maximum efficiency tracking algorithm.

[0102] Figure 11 An internal structural diagram of a computer device in one embodiment is shown. This computer device can specifically be a terminal or a server. Figure 11 As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and may also store a computer program, which, when executed by the processor, causes the processor to perform the aforementioned methods. The internal memory may also store a computer program, which, when executed by the processor, causes the processor to perform the aforementioned methods. Those skilled in the art will understand that… Figure 11 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0103] In one embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform actions such as... Figure 3 or Figure 5 The steps are shown.

[0104] In one embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, causes the processor to perform the following actions: Figure 3 or Figure 5 The steps are shown.

[0105] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0106] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A control method for a wireless power transmission system, characterized in that, The wireless power transmission system includes at least a transmitter and a receiver with a communication connection, and the method is applied to the receiver, the method comprising: The output voltage of the receiving end, the output voltage reference value, and the estimated value of the first pulse density command of the transmitting end are obtained. The output voltage is used to reflect the voltage across the load to be powered. The internal control quantity is determined using the output voltage, the output voltage reference value, and the preset proportional-integral controller. The second pulse density command of the receiving end is determined based on the estimated value and the internal control quantity. The second pulse density command is sent to the transmitting end.

2. The method according to claim 1, characterized in that, The step of determining the second pulse density command of the receiving end based on the estimated value and the internal control quantity includes: The initial second pulse density command is determined by dividing the internal control quantity by the estimated value. The initial second pulse density command is subjected to amplitude limiting processing according to a preset amplitude range to obtain the second pulse density command.

3. The method according to claim 1, characterized in that, The proportional-integral controller is an anti-saturation proportional-integral controller. Therefore, determining the internal control quantity using the output voltage, the output voltage reference value, the estimated value, and the preset proportional-integral controller includes: Determine the difference between the output voltage and the output voltage reference value; The difference is input into the anti-saturation proportional-integral controller for anti-saturation processing to determine the internal control quantity.

4. The method according to claim 1, characterized in that, Obtaining an estimate of the first pulse density command from the transmitting end includes: The system receives the output value of a dynamic simulator via a preset communication link. The output value includes the estimated value, and the input of the dynamic simulator includes at least a second pulse density command.

5. The method according to claim 1, characterized in that, The mathematical expressions for the control parameters of the proportional-integral controller are as follows: In the formula, k min For the minimum value of k, k p and k i ω is the control parameter of the proportional-integral controller. s Where M is the switching frequency, M is the mutual inductance coefficient, L1 and L2 are the resonant inductances of the transmitter and receiver, respectively, and C is the switching frequency. f V1 is the filter capacitor, and R is the DC voltage at the emitter. Lmin This represents the minimum value of the load to be powered.

6. A control method for a wireless power transmission system, characterized in that, The wireless power transmission system includes at least a transmitter and a receiver connected in communication. The method is applied to the transmitter, and the receiver is configured to perform the method as described in any one of claims 1-5, the method comprising: Obtain the second pulse density command sent by the receiving end; The first pulse density command of the transmitting end is determined by performing maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command.

7. A control device for a wireless power transmission system, characterized in that, The wireless power transmission system includes at least a transmitter and a receiver with a communication connection, and the device is applied to the receiver, the device comprising: Data acquisition module: used to acquire the output voltage of the receiving end, the output voltage reference value, and the estimated value of the first pulse density command of the transmitting end, wherein the output voltage is used to reflect the voltage across the load to be powered; First determining module: used to determine internal control quantities using the output voltage, the output voltage reference value, and a preset proportional-integral controller; The second determining module is used to determine the second pulse density command of the receiving end based on the estimated value and the internal control quantity. Data transmission module: used to send the second pulse density command to the transmitting end.

8. A control device for a wireless power transmission system, characterized in that, The wireless power transmission system includes at least a transmitter and a receiver with a communication connection, the apparatus is applied to the transmitter, and the receiver is used to perform the method as described in any one of claims 1-5, the apparatus comprising: Data receiving module: used to acquire the second pulse density command sent by the receiving end; The third determining module is used to perform maximum efficiency tracking processing using a preset maximum efficiency tracking algorithm and the second pulse density command to determine the first pulse density command of the transmitting end.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it causes the processor to perform the steps of the method as described in any one of claims 1 to 5 or as described in claim 6.

10. A computer device, comprising a memory and a processor, characterized in that, The memory stores a computer program that, when executed by the processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 5 or as described in claim 6.

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