Anti-disturbance CV output WPT charging method, system, device and program

Abstract

The invention discloses an anti-disturbance CV output WPT charging method, system, device and program. The method comprises the steps that the output voltage of the system is acquired; and compensating the output voltage of the WPT converter based on the LCC-LCC. Through the processing scheme disclosed by the invention, when parameters such as mutual inductance, self-inductance, load resistance and input voltage of the system are changed, the output voltage of the system can be tracked, and the dynamic performance of the system can be improved.

Description

Technical Field

[0001] The present invention relates to the field of wireless power transmission technology, and in particular to a WPT charging method, system, device and program for anti-disturbance CV output. Background Art

[0002] In order to improve the reliability and efficiency of electric vehicle charging, many studies have explored wireless power transfer (WPT) chargers. Before a typical wireless power transfer charger is turned on, information communication is usually required between the transmitter and the receiver, and a constant voltage output can be achieved based on the threshold voltage of the charging state. However, these typical communication methods do not take into account the changes in mutual inductance and self-inductance due to changes in the coil gap distance and coil offset distance, especially the magnetic coupling mechanism of ferrite cores or aluminum. When the magnetic coupling mechanism is offset, the CV output and dynamic performance effects deteriorate, and the system safety is reduced.

[0003] When WPT charges the battery load, the charging environment is arbitrary, and the charging effect is different in each location environment. If all system operating parameters are regarded as a fixed value, there will be only one CV output point during charging and the dynamic performance of the system will deteriorate. A control system currently proposed for CV charging mode can control the primary inverter phase shift angle according to the equivalent load change of the battery state to achieve CV output. This control method does not require an additional battery management system, but requires a real-time communication system between the primary and secondary sides and does not consider the situation where the mutual inductance and self-inductance of the coils may change due to changes in the coil gap distance and offset distance.

[0004] It can be seen that the above existing wireless power transmission methods still have inconveniences and defects in use, and are in urgent need of further improvement. How to create a new anti-disturbance WPT charging method has become a goal that the industry urgently needs to improve. Summary of the invention

[0005] In view of this, an embodiment of the present disclosure provides a WPT charging method with anti-disturbance CV output, which at least partially solves the problems existing in the prior art.

[0006] In a first aspect, an embodiment of the present disclosure provides a WPT charging method with anti-disturbance CV output, the method comprising the following steps:

[0007] Get the output voltage of the system;

[0008] The output voltage of the WPT converter is compensated based on LCC-LCC.

[0009] According to a specific implementation of an embodiment of the present disclosure, the output voltage of the WPT converter is compensated based on LCC-LCC, including:

[0010] The switching state of the Boost converter on the secondary side of the LCC-LCC is changed in real time based on the output voltage of the system; when the value of the cost function is smaller than that of the previous moment, the switching state is maintained; when the value of the cost function is larger than that of the previous moment, the switching state is changed, and rolling optimization is continued until the output voltage reaches a given value.

[0011] According to a specific implementation of the embodiment of the present disclosure, the cost function is calculated based on the following formula, including:

[0012] g=abs(V ref -V O (k+1))

[0013] Among them, g is the cost function; V ref is a given value; V O (k+1) is the predicted voltage value of the load resistor at the next moment.

[0014] According to a specific implementation of the embodiment of the present disclosure, the voltage value of the load resistor at the next moment is predicted based on the following formula, including:

[0015]

[0016] Among them, V O (k+1) is the predicted voltage value of the load resistor at the next moment; V o (k) is the voltage value of the load resistor at the previous moment; Ts is the switching period of switch Q; C is the capacitance; a is the state of the switch Q of the Boost converter, when a=0, Q is open, when a=1, Q is closed; i B (k) is the peak value of the sinusoidal AC current input to the rectifier circuit at the previous moment; R L is the load resistance.

[0017] In a second aspect, an embodiment of the present disclosure provides a WPT charging system with anti-disturbance CV output, the system comprising:

[0018] A detection module is configured to obtain an output voltage of the system;

[0019] The compensation module is configured to compensate the output voltage of the WPT converter based on LCC-LCC.

[0020] According to a specific implementation of the embodiment of the present disclosure, the system further includes:

[0021] The Boost module is configured to change the switch state of the Boost converter on the secondary side of the LCC-LCC in real time based on the output voltage of the system; when the value of the cost function is smaller than that of the previous moment, the switch state is maintained; when the value of the cost function is larger than that of the previous moment, the switch state is changed, and rolling optimization is continued until the output voltage reaches a given value.

[0022] In a third aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising:

[0023] at least one processor; and,

[0024] a memory communicatively connected to the at least one processor; wherein,

[0025] The memory stores instructions that can be executed by the at least one processor. When the instructions are executed by the at least one processor, the at least one processor implements the WPT charging method with anti-disturbance CV output as described in any one of the first aspect or any one of the implementations of the first aspect.

[0026] In a fourth aspect, an embodiment of the present disclosure further provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, and when the program instructions are executed by a computer, the computer executes the WPT charging method with anti-disturbance CV output in the aforementioned first aspect or any implementation of the first aspect.

[0027] The WPT charging method with anti-disturbance CV output in the disclosed embodiment can track the system output voltage and improve the dynamic performance of the system when the system parameters such as mutual inductance, self-inductance, load resistance and input voltage change by controlling the switching state of Boost. It is used in high-power wireless charging fields such as full-power electric vehicles, with strong adaptability and wide application. The experimental results verify the effectiveness of the proposed method. The results show that when multiple parameters are disturbed, the output voltage of the system can be kept constant with an error of less than 0.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Figure 1 A schematic flow chart of a WPT charging method with anti-disturbance CV output provided in an embodiment of the present disclosure;

[0030] Figure 2 A schematic diagram of a WPT charging method with anti-disturbance CV output provided in an embodiment of the present disclosure;

[0031] Figure 3 A control diagram of a proposed resonant frequency tracking scheme implemented in a DSP provided in an embodiment of the present disclosure;

[0032] Figure 4 A schematic diagram of a zero-crossing detection circuit provided in an embodiment of the present disclosure;

[0033] Figure 5 A schematic diagram of a dynamic change of an output voltage when an input voltage disturbance occurs provided by an embodiment of the present disclosure;

[0034] Figure 6 A method for dynamically changing the output voltage when a load resistance suddenly changes is provided in an embodiment of the present disclosure.

[0035] Figure 7 A method for dynamically changing the output voltage when a given voltage changes is provided in an embodiment of the present disclosure.

[0036] Figure 8 A schematic diagram of a wireless charging overall system module provided by an embodiment of the present disclosure;

[0037] Fig. 9 A schematic diagram of the structure of a WPT charging system with anti-disturbance CV output provided in an embodiment of the present disclosure;

[0038] Fig.10 A schematic diagram of an electronic device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0040] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0041] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement a device and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0042] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0043] The embodiment of the present invention provides a WPT charging method with anti-disturbance CV output, which uses a model predictive control scheme to change the switching state of the Boost converter in real time according to the output voltage of the system. When the output voltage of the LCC-LCC (compensation topology, Inductor-Capacitor-Capacitor) compensated WPT converter approaches a given value, the output voltage of the system can be well tracked. The present invention conducts a detailed technical analysis on how to track and control the output voltage of the LCC-LCC compensated WPT system.

[0044] Figure 1 A schematic diagram of the WPT charging method process with anti-disturbance CV output provided in an embodiment of the present disclosure.

[0045] like Figure 1 As shown, at step S110, the output voltage of the system is obtained.

[0046] More specifically, the process proceeds to step S120.

[0047] At step S120 , the output voltage of the WPT converter is compensated based on LCC-LCC.

[0048] In an embodiment of the present invention, the output voltage of the WPT converter is compensated based on LCC-LCC, including: changing the switching state of the Boost converter on the secondary side of the LCC-LCC in real time based on the output voltage of the system; when the value of the cost function is smaller than that of the previous moment, the switching state is maintained; when the value of the cost function is larger than that of the previous moment, the switching state is changed, and rolling optimization is continued until the output voltage reaches a given value.

[0049] More specifically, the voltage setting here is related to different types of loads. Because the charging process of most loads is constant current first and then constant voltage, the voltage threshold of constant voltage charging is related to the load current when the load starts constant voltage charging. This patent is aimed at the constant voltage charging stage of wireless charging of small and medium power loads, and the given voltage range is 40~50V.

[0050] In an embodiment of the present invention, the cost function is calculated based on the following formula, including:

[0051] g=abs(V ref -V O (k+1))

[0052] Among them, g is the cost function; V ref is a given value; V O (k+1) is the predicted voltage value of the load resistor at the next moment.

[0053] In an embodiment of the present invention, the voltage value of the load resistor at the next moment is predicted based on the following formula, including:

[0054]

[0055] Among them, V O (k+1) is the predicted voltage value of the load resistor at the next moment; V o (k) is the voltage value of the load resistor at the previous moment; Ts is the switching period of switch Q; C is the capacitance; a is the state of the switch Q of the Boost converter, when a=0, Q is open, when a=1, Q is closed; i B (k) is the peak value of the sinusoidal AC current input to the rectifier circuit at the previous moment; R L is the load resistance.

[0056] More specifically, the following is a more detailed description through embodiments:

[0057] The LCC-LCC compensated WPT system with a Boost converter on the secondary side is theoretically analyzed, and the expression of the output voltage is derived. Then, according to the model predictive control method proposed in the present invention, the system switching state is adjusted to meet the requirements of charging under multi-parameter disturbances.

[0058] The LCC-LCC compensated WPT converter topology with secondary side Boost converter is shown in Figure 2 For ease of reference, the subscripts p and s represent the parameters of the primary and secondary sides, respectively. The self-inductance of the magnetic coupling mechanism is L p , L s , the equivalent parasitic resistances are R p , R s , coupling coefficient Where M is the mutual inductance of the magnetic coupling mechanism. D1 to D4 form the receiving end rectifier circuit, and the energy between the transmitting end and the receiving end is transferred by the magnetic coupling coil in the middle. The Boost converter consists of an inductor L and an inductor internal resistance r L , capacitor C, diode D, switch Q, load resistance R L .

[0059] LCC-LCC compensation capacitor C p , C fp , C s and C sp The primary side voltage is υ p The inverter and secondary voltage are s The operating angular frequency ω is usually equal to the system resonant frequency, that is, Among them, L fp is the primary side compensation inductor of the LCC-LCC compensation topology, L fs It is the secondary side compensation inductor of the LCC-LCC compensation topology.

[0060] For the primary inverter, the two H-bridge legs (Q1, Q4) and (Q2, Q3) are turned on and off simultaneously with a 50% duty cycle. p and R s is very small and has little effect on the output, so it is often ignored in circuit analysis. The system equivalent circuit is as follows: Figure 3 As shown, according to Kirchhoff's voltage law, the circuit equation can be written as

[0061]

[0062] When the system meets the resonance condition,

[0063]

[0064] The current of each branch can be calculated as

[0065]

[0066] Where I1 is the output current of the inverter; j is the imaginary unit; ω = 2π × f s ;I p is the current flowing through the inductor L p The current; V p is the primary side voltage of the inverter; L p is the self-inductance of the primary side of the magnetic coupling mechanism; M is the mutual inductance of the magnetic coupling mechanism; I s is the current flowing through the inductor L s I2 is the input current of the rectifier; C s It is the series compensation capacitor of the inductor Ls.

[0067] R eq is the rectifier, Boost converter and resistive load R L The equivalent load, R eq The calculation of is given below.

[0068] First, the input voltage of the Boost converter is V B , the input current is I B , load resistance R L The voltage is V o , the output current is I o According to the input and output characteristics of the Boost converter, we have the following equation:

[0069]

[0070] Where D is the duty cycle of the Boost converter. o / I o =R L , Boost and R can be calculated L The equivalent load R B The expression is

[0071] R B =(1-D) 2 R L (5)

[0072] Equivalent load R B Limited to 0~R L within the range.

[0073] Next, calculate R eq With R B The circuit operates at the resonant frequency ω0, and the output square wave AC voltage v of the inverter circuit p (t) Expand using Fourier series

[0074]

[0075] Among them, V in is the DC input voltage and t is the time.

[0076] The AC square wave voltage is composed of the superposition of sinusoidal voltages of different orders. Since the LCC compensation circuit can extract the fundamental component and filter out the harmonic component, the fundamental wave expression is taken as the equivalent voltage source expression of the inverter circuit input resonant topology.

[0077]

[0078] The relationship between the rectifier input current and output current is:

[0079] i2(t)=IB sinω0t (8)

[0080] The compensation topology can be obtained by Fourier decomposition of the input AC square wave voltage of the rectifier circuit:

[0081]

[0082] Similar to the input voltage, the fundamental component of the input AC voltage of the rectifier circuit is taken

[0083]

[0084] The equivalent resistance expression of the rectifier circuit relative to the compensation topology is:

[0085]

[0086] V B is the output DC voltage value of the rectifier circuit, I BP is the peak value of the sinusoidal AC current input to the rectifier circuit, T is a working cycle, T = 1 / fs, w = 2πfs, and I BP Converted to rectifier output DC current value I B The average value of the output DC current is

[0087]

[0088] Substituting equation (12) into equation (11), we can get R eq With R B The equivalent relationship of

[0089]

[0090] Model predictive control is different from traditional control methods. Traditional control requires complex mathematical modeling of the system, finding the transfer function of the system, analyzing its Bode diagram, and then determining the value of each control parameter. Model predictive control is based on the state of the current real model, predicting the changes of the system at the next moment within a cycle, and achieving the output target through multiple rolling optimizations. The characteristics of its rolling optimization make model predictive control have better output tracking capabilities and dynamic response performance. Therefore, model predictive control is applied to the Boost converter to realize the CV output of the WPT system with LCC-LCC compensation.

[0091] Because the control part is in the Boost converter, the Boost converter needs to be analyzed separately, such as Figure 4 shown.

[0092] The Boost converter works in two states:

[0093] Q is closed, and the circuit equation is:

[0094]

[0095] Q is turned on, and the circuit equation is:

[0096]

[0097] Combining (14) and (15) together gives

[0098]

[0099] Wherein, a is the switching state of the Boost converter Q, a=0, Q is open, a=1, Q is closed.

[0100] Discretize equation (16) to get

[0101]

[0102] Among them, i B (k+1), V O (k+1) is the predicted value at the next moment, i B (k), V o (k), s(k) are the values ​​at the previous moment, T s is the switching period of switch Q. Then, the cost function g is established as

[0103] 9=abs(V ref -V o (k+1)) (18)

[0104] Among them, V ref is a given value. By controlling the switch state a of switch Q, the predicted value V under different a is calculated. o (k+1), if a is in the current state and the value of g is smaller than that of the previous moment, then it will continue to be maintained. Otherwise, the value of a will be changed. The rolling optimization will continue until the output voltage reaches the given value.

[0105] Table I

[0106]

[0107] Table II

[0108]

[0109] Table I shows the output voltage of the WPT system under MPC control at different load values. It can be seen that the output voltage can be stably maintained at a given value of 50V, with a maximum error of no more than 0.4%. Table II shows the output voltage of the system at different mutual inductance values, where the mutual inductance of 42μH is the mutual inductance value when the coils are facing each other, and the coupling coefficient is 0.29. It can be seen that when the mutual inductance changes from 22 to 42μH, the output voltage is maintained at around 50V, with a maximum error of no more than 0.4%. In order to demonstrate the dynamic performance of the system when disturbances occur, we simulated the changes in output voltage under three conditions: sudden changes in input voltage, sudden changes in load resistance, and sudden changes in output given values. Figure 5 It shows the dynamic change of output voltage when the input voltage drops from 40V to 20V. At 0.05s, the input voltage suddenly changes, and the output voltage rises first and then falls. The change amplitude is 1.56V and the duration is 267ms. Then it enters the steady state and the output voltage stabilizes at 50V. Figure 6 The figure shows the dynamic change of the output voltage when the load resistance suddenly changes from 50Ω to 80Ω. At 0.05s, the load resistance suddenly changes, and the output voltage overshoots with an amplitude of 1.1V. After 242ms, the output voltage enters a steady state and remains at 50V. Figure 7 It shows the dynamic change of output voltage when the given voltage value increases from 50V to 70V. At 0.05s, the given voltage value suddenly changes. At this time, the output voltage continues to rise. After reaching 70V, there is an overshoot of 1.1V. Then the output voltage drops to 70V and remains in a steady state. The output voltage change time is 300ms.

[0110] In the embodiment of the present invention, Figure 8 As shown, the present invention includes a power module, an inverter module, a compensation module, a coupling module, an active rectifier module, a detection module, a microprocessor and a gate drive circuit; wherein the power module is used to power the WPT system; the MOSFET power tube model in the inverter module is IPP65R045, and the diode model is MBR20200; the compensation module is divided into a primary side and a secondary side; the coupling module is used for the transmission of electric energy; the active rectifier module rectifies the AC power into DC power for the load; the detection module includes a high-frequency current sensor, a comparison amplifier circuit, and a zero-crossing comparator, which is used to detect the phase difference when the coil gap distance changes. The microprocessor is used to program and generate PWM waves. The gate drive circuit is used to drive the MOSFET to turn on and off.

[0111] The values ​​of each capacitor and inductor in this patent are as follows

[0112] Fig. 9The WPT charging system 900 with anti-disturbance CV output provided by the present invention is shown, including a detection module 910 and a compensation module 920 .

[0113] The detection module 910 is used to obtain the output voltage of the system;

[0114] The compensation module 920 is used to compensate the output voltage of the WPT converter based on LCC-LCC.

[0115] In an embodiment of the present invention, the system further includes: a Boost module, which is configured to change the switching state of the Boost converter on the secondary side of the LCC-LCC in real time based on the output voltage of the system; wherein, when the value of the cost function is smaller than that of the previous moment, the switching state is maintained; when the value of the cost function is larger than that of the previous moment, the switching state is changed, and rolling optimization is continued until the output voltage reaches a given value.

[0116] See also Fig.10 The present disclosure also provides an electronic device 100, which includes:

[0117] at least one processor; and,

[0118] a memory communicatively connected to the at least one processor; wherein,

[0119] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the WPT charging method with anti-disturbance CV output in the aforementioned method embodiment.

[0120] The embodiment of the present disclosure also provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable the computer to execute the WPT charging method with anti-disturbance CV output in the aforementioned method embodiment.

[0121] The embodiments of the present disclosure also provide a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the WPT charging method with anti-disturbance CV output in the aforementioned method embodiment.

[0122] Reference below Fig.10, which shows a schematic diagram of the structure of an electronic device 100 suitable for implementing the embodiment of the present disclosure. The electronic device in the embodiment of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle terminals (such as vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Fig.10 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0123] like Fig.10 As shown, the electronic device 100 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 1001, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1008 into a random access memory (RAM) 1003. In the RAM 1003, various programs and data required for the operation of the electronic device 100 are also stored. The processing device 1001, the ROM 1002, and the RAM 1003 are connected to each other via a bus 1004. An input / output (I / O) interface 1005 is also connected to the bus 1004.

[0124] Typically, the following devices may be connected to the I / O interface 1005: input devices 1006 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1007 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1008 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 may allow the electronic device 100 to communicate wirelessly or wired with other devices to exchange data. Although the electronic device 100 with various devices is shown in the figure, it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have alternatively.

[0125] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device 1009, or installed from a storage device 1008, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0126] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0127] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0128] The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: obtains at least two Internet Protocol addresses; sends a node evaluation request including the at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0129] Alternatively, the computer-readable medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device: receives a node evaluation request including at least two Internet Protocol addresses; selects an Internet Protocol address from the at least two Internet Protocol addresses; and returns the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0130] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0131] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0132] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware. The name of a unit does not limit the unit itself in some cases. For example, the first acquisition unit may also be described as a "unit for acquiring at least two Internet Protocol addresses".

[0133] It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof.

[0134] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A WPT charging method with anti-disturbance CV output, characterized in that: The method comprises the following steps: Get the output voltage of the system; The output voltage of the WPT converter is compensated based on LCC-LCC.

2. The WPT charging method with anti-disturbance CV output according to claim 1, characterized in that: The method of compensating the output voltage of the WPT converter based on LCC-LCC includes: The switching state of the Boost converter on the secondary side of the LCC-LCC is changed in real time based on the output voltage of the system; when the value of the cost function is smaller than that of the previous moment, the switching state is maintained; when the value of the cost function is larger than that of the previous moment, the switching state is changed, and rolling optimization is continued until the output voltage reaches a given value.

3. The WPT charging method with anti-disturbance CV output according to claim 2, characterized in that: The cost function is calculated based on the following formula, including: g=abs(V ref -V O (k+1)) Among them, g is the cost function; V ref is a given value; V O (k+1) is the predicted voltage value of the load resistor at the next moment.

4. The WPT charging method with anti-disturbance CV output according to claim 3 is characterized in that: The voltage value of the load resistor at the next moment is predicted based on the following formula, including: Among them, V O (k+1) is the predicted voltage value of the load resistor at the next moment; V o (k) is the voltage value of the load resistor at the previous moment; Ts is the switching period of switch Q, and the sampling period of Ts is 1 / 100000s; C is the capacitor; a is the state of the switch Q of the Boost converter, when a=0, Q is open, when a=1, Q is closed; i B (k) is the peak value of the sinusoidal AC current input to the rectifier circuit at the previous moment; R L is the load resistance.

5. A WPT charging system with anti-disturbance CV output, characterized in that: The system comprises: A detection module is configured to obtain an output voltage of the system; The compensation module is configured to compensate the output voltage of the WPT converter based on LCC-LCC.

6. The WPT charging system with anti-disturbance CV output according to claim 5, characterized in that: The system further comprises: The Boost module is configured to change the switch state of the Boost converter on the secondary side of the LCC-LCC in real time based on the output voltage of the system; when the value of the cost function is smaller than that of the previous moment, the switch state is maintained; when the value of the cost function is larger than that of the previous moment, the switch state is changed, and rolling optimization is continued until the output voltage reaches a given value.

7. An electronic device, characterized in that: The electronic device includes: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor executes the WPT charging method with anti-disturbance CV output as described in any one of claims 1 to 4.

8. A computer program product, characterized in that The computer program product comprises a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, and when the program instructions are executed by a computer, the computer is caused to perform the WPT charging method with anti-disturbance CV output as claimed in any one of claims 1 to 4.

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