High-adaptability wireless charging receiving circuit suitable for network-construction-type energy storage battery and network-construction-type energy storage battery

Abstract

The invention provides a high-adaptability wireless charging receiving circuit suitable for a network-forming type energy storage battery and the network-forming type energy storage battery. The wireless charging receiving circuit comprises a wireless charging receiving circuit and a control module, the wireless charging receiving circuit comprises an adjustable capacitor network; the adjustable capacitor network comprises a capacitor and a switch tube; the control module collects working parameters of the wireless charging receiving circuit and determines a target switch tube duty ratio required for changing an equivalent capacitance value of the adjustable capacitor network; and the control module is also used for outputting a control signal to the control end of the switching tube so as to change the charge-discharge state of the capacitor in the circuit according to the duty ratio of the target switching tube and further change the equivalent capacitance value of the adjustable capacitor network. According to the invention, the equivalent capacitance value of the adjustable capacitor network is adjusted to match wireless charging primary side circuit parameters, so that the circuit flexibility is improved, the adaptability, charging performance and convenience of different specifications of network-forming type energy storage batteries are improved, the electric quantity loss is reduced, the heating is reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless charging, and in particular relates to a highly adaptable wireless charging receiving circuit suitable for a meshed energy storage battery and a meshed energy storage battery. Background Art

[0002] Grid-connected energy storage batteries play a crucial role in energy storage and applications. Technological advancements are driving higher demands for their safety and convenience. Traditional grid-connected energy storage batteries are gradually facing challenges, prompting a search for new solutions.

[0003] Wireless charging technology for grid-connected energy storage batteries, with its advantages of space-saving, convenient, contactless operation, and low operating costs, has become an important approach to addressing potential safety isolation and battery maintenance and switching issues for grid-connected energy storage batteries. Furthermore, the co-development of wireless charging and traditional wired charging has become a key trend in the development of grid-connected energy storage batteries. The wireless charging receiver circuit, as a key component of wireless charging technology, plays a crucial role in the overall wireless charging system.

[0004] Existing wireless charging for grid-connected energy storage batteries requires a unique pairing of primary and secondary parameters, and a commonly used design employs a primary-secondary parameter coupling and binding. This results in a series of issues when receiving energy using a receiving coil with mismatched secondary parameters, including significant power loss, substandard charging current, low charging efficiency, and severe heat generation. This severely impacts the versatility, convenience, and safety of wireless charging for grid-connected energy storage batteries of varying specifications, further reducing the convenience and safety of grid-connected energy storage. Summary of the Invention

[0005] In view of this, the present invention aims to solve the problem of proposing a highly adaptable wireless charging receiving circuit and a meshed energy storage battery suitable for meshed energy storage batteries, thereby improving the wireless charging adaptability of meshed energy storage batteries by increasing circuit flexibility.

[0006] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0007] In a first aspect, the present invention provides a highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery, comprising:

[0008] Wireless charging receiving circuit and control module;

[0009] The wireless charging receiving circuit includes an adjustable capacitor network;

[0010] The adjustable capacitor network includes a capacitor and a switch tube for controlling the charge and discharge state of the capacitor;

[0011] The output end of the control module is electrically connected to the control end of the switch tube in the wireless charging receiving circuit;

[0012] The control module is used to collect the operating parameters of the wireless charging receiving circuit and determine the target switch tube duty cycle required to change the equivalent capacitance value of the adjustable capacitor network based on the operating parameters; it is also used to output a control signal to the control end of the switch tube to change the charging and discharging state of the capacitor in the circuit according to the target switch tube duty cycle, thereby changing the equivalent capacitance value of the adjustable capacitor network, so that the wireless charging receiving circuit after the equivalent capacitance value is changed matches the parameters of the wireless charging primary circuit.

[0013] Furthermore, the control module includes:

[0014] Current sampling module, neural network controller and MCU control unit;

[0015] The current sampling module is used to collect the current flowing through each capacitor in the adjustable capacitor network;

[0016] The neural network controller is used to predict the parameters of the wireless charging primary circuit using a pre-trained neural network model based on the current data collected by the current sampling module;

[0017] The MCU control unit is used to determine the duty cycle of the target switch tube based on the wireless charging primary circuit parameters predicted by the neural network controller, and output a control signal to the control end of the corresponding switch tube, thereby changing the capacitance of the corresponding capacitor to the desired capacitance.

[0018] Furthermore, the wireless charging receiving circuit includes:

[0019] a first receiving coil and an adjustable capacitor network;

[0020] The adjustable capacitor network includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a first capacitor, a second capacitor and a third capacitor;

[0021] The first end of the first receiving coil is connected to the first end of the first capacitor and the first end of the first switching tube;

[0022] The second end of the first switching tube is connected to the first end of the second switching tube;

[0023] The second end of the second switch tube is connected to the second end of the first capacitor, the first end of the second capacitor, the first end of the third switch tube, and the first end of the fifth switch tube;

[0024] The second end of the third switch tube is connected to the first end of the fourth switch tube;

[0025] The second end of the second capacitor is connected to the second end of the fourth switch tube;

[0026] The second end of the fifth switch tube is connected to the first end of the sixth switch tube;

[0027] The second end of the third capacitor is connected to the second end of the sixth switch tube;

[0028] The second end of the first receiving coil is connected to the second end of the four switching tubes;

[0029] The first receiving coil serves as an input end of the wireless charging receiving circuit;

[0030] The second ends of the four switch tubes and the second end of the sixth switch tube serve as output ends of the wireless charging receiving circuit.

[0031] Furthermore, the input end of the wireless charging receiving circuit is coupled and inductively connected to the black box transmitting coil, and the output end of the wireless charging receiving circuit is connected to the meshed charging module.

[0032] Furthermore, the current flowing through each capacitor in the adjustable capacitor network collected by the current sampling module includes:

[0033] a current at a first terminal of the first capacitor, a current at a first terminal of the second capacitor, and a current at a second terminal of the third capacitor.

[0034] Furthermore, when the wireless charging receiving circuit is working, each switch tube meets the following constraints:

[0035]

[0036] Where, is the duty cycle of the first switch tube, is the duty cycle of the second switch tube, is the duty cycle of the third switch tube, is the duty cycle of the fourth switch tube, is the duty cycle of the fifth switch tube, is the duty cycle of the sixth switch tube.

[0037] Furthermore, when the wireless charging receiving circuit is operating, the expected capacitance of the capacitor corresponding to the target switch tube is determined according to the following formula:

[0038]

[0039] Where, is the expected capacitance value of the capacitor, is the basic capacitance of the capacitor, is the duty cycle of the target switch.

[0040] Furthermore, when the wireless charging receiving circuit after changing the equivalent capacitance value matches the parameters of the wireless charging primary circuit, the wireless charging receiving circuit satisfies the following constraints:

[0041]

[0042]

[0043]

[0044] Where, is the coupling inductance between the first receiving coil and the primary black box transmitting coil, is the secondary side leakage inductance, is the expected capacitance of the first capacitor, is the imaginary unit, The working angular frequency of wireless charging; is the expected capacitance of the second capacitor; is the leakage inductance of the primary black box transmitting coil, is the expected capacitance of the third capacitor.

[0045] Furthermore, the MCU control unit is used to determine the duty cycle of the target switch tube according to the wireless charging primary circuit parameters predicted by the neural network controller, including:

[0046] Receive the leakage inductance of the primary black box transmitter coil predicted by the neural network controller;

[0047] Calculate the expected capacitance of each capacitor based on the predicted leakage inductance of the primary black box transmitter coil and the operating parameters of the wireless charging receiver circuit.

[0048] Calculate the duty cycle of the corresponding switch tube according to the expected capacitance of each capacitor.

[0049] In a second aspect, the present invention provides a meshed energy storage battery, comprising a meshed charging module, and also comprising a highly adaptable wireless charging receiving circuit suitable for the meshed energy storage battery as in the first aspect, wherein the output end of the wireless charging receiving circuit is connected to the input end of the meshed charging module.

[0050] In summary, the present invention provides a highly adaptable wireless charging receiving circuit and a meshed energy storage battery suitable for a meshed energy storage battery, wherein the wireless charging receiving circuit includes a wireless charging receiving circuit and a control module; the wireless charging receiving circuit includes an adjustable capacitor network; the adjustable capacitor network includes a capacitor and a switch tube for controlling the charging and discharging state of the capacitor; the output end of the control module is electrically connected to the control end of the switch tube in the wireless charging receiving circuit; the control module is used to collect the working parameters of the wireless charging receiving circuit, and determine the target switch tube duty cycle required to change the equivalent capacitance value of the adjustable capacitor network based on the working parameters; and is also used to output a control signal to the control end of the switch tube to change the charging and discharging state of the capacitor in the circuit according to the target switch tube duty cycle, thereby changing the equivalent capacitance value of the adjustable capacitor network, so that the wireless charging receiving circuit after the equivalent capacitance value is changed matches the parameters of the wireless charging primary circuit. The present invention uses a control module to adjust the equivalent capacitance value of the adjustable capacitor network according to operating parameters to match the parameters of the primary circuit of wireless charging, thereby improving the flexibility of the circuit, improving the adaptability, charging performance and convenience of network-type energy storage batteries of different specifications, reducing power loss and heat generation, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 A schematic structural diagram of a highly adaptable wireless charging receiving circuit for a network-type energy storage battery provided by an embodiment of the present invention;

[0053] Figure 2 A diagram showing a realistic application scenario of a highly adaptable wireless charging receiving circuit for a network-type energy storage battery provided by an embodiment of the present invention;

[0054] Figure 3 An equivalent circuit diagram of a highly adaptable wireless charging receiving circuit for a network-type energy storage battery provided by an embodiment of the present invention;

[0055] Figure 4 An equivalent circuit diagram of a highly adaptable wireless charging receiving circuit and a black box circuit suitable for a network-type energy storage battery provided by an embodiment of the present invention;

[0056] Figure 5 This is a working waveform diagram of a switched capacitor in a highly adaptable wireless charging receiving circuit for a network-type energy storage battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to make the purposes, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0058] The following first introduces some technical terms involved in the present invention:

[0059] (1) Grid-type energy storage battery: This is an energy storage battery with the ability to build a power network. In the power system, traditional energy storage batteries mainly play the role of storing and releasing electrical energy, while grid-type energy storage batteries can not only achieve this basic function, but also actively participate in the control process of the power network such as voltage and frequency regulation, which helps to enhance the stability and reliability of the power system.

[0060] (2) Wireless charging receiving circuit: The circuit part that converts wirelessly transmitted electrical energy into electrical energy that can be used by the battery.

[0061] (3) Switching tube: An electronic component that can control the on / off state of a circuit. In this invention, it is used to control the charge and discharge state of a capacitor. Common switching tubes include MOSFET (metal-oxide-semiconductor field-effect transistor) and IGBT (insulated gate bipolar transistor).

[0062] (4) Wireless charging primary circuit: The circuit part responsible for transmitting electrical energy in the wireless charging system, usually connected to the power supply, converting electrical energy into an alternating magnetic field for wireless transmission.

[0063] (5) Coupling inductance: The mutual inductance phenomenon caused by magnetic coupling between two or more inductive elements. In a wireless charging system, coupling inductance exists between the receiving coil and the primary black box transmitting coil, which reflects the degree of magnetic field coupling between the two coils.

[0064] (6) Secondary leakage inductance: In the wireless charging receiving circuit, in addition to the coupling inductance generated by the receiving coil and the primary transmitting coil, there is also a part of the inductance that does not participate in the coupling. This part of the inductance is called the secondary leakage inductance.

[0065] The embodiment of the present invention first provides a highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery, comprising:

[0066] Wireless charging receiving circuit and control module;

[0067] The wireless charging receiving circuit includes an adjustable capacitor network;

[0068] The adjustable capacitor network includes a capacitor and a switch tube for controlling the charge and discharge state of the capacitor;

[0069] The output end of the control module is electrically connected to the control end of the switch tube in the wireless charging receiving circuit;

[0070] The control module is used to collect the operating parameters of the wireless charging receiving circuit and determine the target switch tube duty cycle required to change the equivalent capacitance value of the adjustable capacitor network based on the operating parameters; it is also used to output a control signal to the control end of the switch tube to change the charging and discharging state of the capacitor in the circuit according to the target switch tube duty cycle, thereby changing the equivalent capacitance value of the adjustable capacitor network, so that the wireless charging receiving circuit after the equivalent capacitance value is changed matches the parameters of the wireless charging primary circuit.

[0071] In this embodiment, the adjustable capacitor network is composed of capacitors and switches that control the charge and discharge states of the capacitors. By controlling the switches, the capacitor connection mode and charge and discharge states are changed to adjust the equivalent capacitance value. Operating parameters are electrical parameters that reflect the operating state of the wireless charging receiver circuit, such as current, voltage, and frequency. The target switch duty cycle is the ratio of the switch's on-time within a switching cycle to the total cycle time. This is calculated by the control module based on the operating parameters and is used to change the equivalent capacitance value.

[0072] During implementation, the control module first collects the operating parameters of the wireless charging receiver circuit (such as current and voltage). Based on these parameters, it calculates the target switch duty cycle required to change the equivalent capacitance of the adjustable capacitor network. Next, the control module outputs a control signal to the control terminal of the switch, which changes the charge and discharge state of the capacitor in the circuit according to the target duty cycle. As the charge and discharge state of the capacitor changes, the equivalent capacitance of the adjustable capacitor network also changes. Ultimately, the wireless charging receiver circuit, after the equivalent capacitance value is changed, matches the parameters of the wireless charging primary circuit, enabling efficient wireless power transmission to the networked energy storage battery.

[0073] This embodiment provides a highly adaptable wireless charging receiver circuit for network-based energy storage batteries. This circuit employs an adjustable capacitor network to flexibly change the equivalent capacitance by controlling the switching transistors. This circuit overcomes the limitations of traditional wireless charging, which restricts the coupling of primary and secondary circuit parameters. The circuit can adapt to varying primary circuit parameters. Furthermore, a control module dynamically adjusts the switching transistor duty cycle based on operating parameters, automatically matching the receiving circuit parameters with the primary circuit parameters, improving charging adaptability.

[0074] In one embodiment, the control module includes:

[0075] Current sampling module, neural network controller and MCU control unit;

[0076] The current sampling module is used to collect the current flowing through each capacitor in the adjustable capacitor network;

[0077] The neural network controller is used to predict the parameters of the wireless charging primary circuit using a pre-trained neural network model based on the current data collected by the current sampling module;

[0078] The MCU control unit is used to determine the duty cycle of the target switch tube based on the wireless charging primary circuit parameters predicted by the neural network controller, and output a control signal to the control end of the corresponding switch tube, thereby changing the capacitance of the corresponding capacitor to the desired capacitance.

[0079] In this embodiment, the MCU control unit is a microcontroller unit (MCU), also known as a single-chip microcomputer. It integrates a central processing unit (CPU), memory (such as flash memory, random access memory, etc.), and input and output interfaces, enabling data processing and logical control according to pre-set programs. In this invention, it is responsible for receiving information, performing calculations, and outputting control signals, and is the key execution component that enables the control module to implement its functions.

[0080] A neural network controller is a control unit that uses a neural network algorithm to analyze and process input data. A neural network is a computational model that mimics the structure and function of biological neural networks and consists of a large number of interconnected neurons. It can establish complex mapping relationships between input and output by learning from large amounts of data. In this invention, it is used to predict the parameters of the primary circuit of a wireless charging device based on the current data collected by the current sampling module.

[0081] The control module is comprised of a current sampling module, a neural network controller, and an MCU control unit. The current sampling module performs basic data acquisition, collecting key data on the circuit's real-time operating status by sampling the current flowing through each capacitor in the adjustable capacitor network. The neural network controller uses this current data to perform complex calculations using a pretrained neural network model to predict the parameters of the wireless charging primary circuit. This process simulates the learning and decision-making mechanisms of human neural networks and effectively handles complex nonlinear relationships. Finally, the MCU control unit accurately calculates and determines the target duty cycle of the switching transistor based on the primary circuit parameters predicted by the neural network controller. It then outputs a control signal to the control terminal of the corresponding switching transistor, causing the switch to operate at the specified duty cycle, thereby changing the capacitance of the corresponding capacitor to achieve the desired capacitance. This achieves the matching of the equivalent capacitance of the adjustable capacitor network with the parameters of the wireless charging primary circuit, improving the dynamic performance of the receiving circuit, enhancing the system's power reception efficiency for different black box models, and reducing heat generation.

[0082] See also Figure 1 , Figure 1This is a structural diagram of a highly adaptable wireless charging receiving circuit suitable for network-type energy storage batteries designed based on the above embodiment.

[0083] like Figure 1 As shown, the wireless charging receiving circuit includes: a first receiving coil L1 and an adjustable capacitor network; the adjustable capacitor network includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a first capacitor C v1 , the second capacitor C v2 and the third capacitor C v3 .

[0084] The first end of the first receiving coil L1 is connected to the first capacitor C v1 and a first end of the first switch tube Q1;

[0085] The second end of the first switch tube Q1 is connected to the first end of the second switch tube Q2;

[0086] The second terminal of the second switch tube Q2 is connected to the first capacitor C v1 The second end of the second capacitor C v2 The first end of the third switch tube Q3 and the first end of the fifth switch tube Q5 are connected;

[0087] The second end of the third switch tube Q3 is connected to the first end of the fourth switch tube Q4;

[0088] The second capacitor C v2 The second end of is connected to the second end of the fourth switch tube Q4;

[0089] The second end of the fifth switch tube Q5 is connected to the first end of the sixth switch tube Q6;

[0090] The third capacitor C v3 The second end of is connected to the second end of the sixth switch tube Q6;

[0091] The second end of the first receiving coil L1 is connected to the second end of the four switching tubes;

[0092] The first receiving coil L1 serves as the input end of the wireless charging receiving circuit;

[0093] The second end of the fourth switch tube Q4 and the second end of the sixth switch tube Q6 serve as output ends of the wireless charging receiving circuit.

[0094] by Figure 1 The main circuit structure shown in the figure is combined with Figure 2-5 Other embodiments of the present invention are introduced.

[0095] In one embodiment, the wireless charging receiving circuit adopts Figure 1The circuit structure shown.

[0096] In this embodiment, the first receiving coil is a crucial component of the receiving end. It utilizes the principle of electromagnetic induction to extract electrical energy from the alternating magnetic field emitted by the primary wireless charging circuit, converting the magnetic field energy into electrical energy to provide input for subsequent circuits. Switches (Q1-Q6) are electronic switching elements that can quickly turn the circuit on or off based on control signals. In an adjustable capacitor network, these switches control the charge and discharge processes of the capacitors and are key control components for adjusting the equivalent capacitance value. Capacitors (Cv1-Cv3) are charge storage elements that store and release electrical energy within the circuit. In an adjustable capacitor network, the varying charge and discharge states of the capacitors affect the equivalent capacitance value of the entire network. The first receiving coil L1 serves as the input of the wireless charging receiving circuit, receiving electromagnetic energy from the primary circuit. The second terminal of the fourth switch Q4 and the second terminal of the sixth switch Q6 serve as output terminals, transmitting the electrical energy processed by the adjustable capacitor network to power subsequent network-connected charging modules or energy storage batteries.

[0097] See also Figure 2 In one embodiment of the present invention, the input end of the wireless charging receiving circuit is coupled and inductively connected to the black box transmitting coil, and the output end of the wireless charging receiving circuit is connected to the meshed charging module.

[0098] See also Figure 3 , Figure 3 The equivalent circuit of the wireless charging receiving circuit is shown. Ceq1, Ceq2, and Ceq3 are adjustable equivalent capacitors. The capacitance of these capacitors can be adjusted by the control module to change the equivalent parameters of the circuit, so that the wireless charging receiving circuit can match the parameters of the wireless charging primary circuit, thereby achieving efficient wireless power reception and transmission.

[0099] Please refer again Figure 1 In one embodiment, the current flowing through each capacitor in the adjustable capacitor network collected by the current sampling module includes:

[0100] The first capacitor C v1 the current at the first end of the capacitor, the current at the first end of the second capacitor, and the current at the second end of the third capacitor.

[0101] In this embodiment, the current sampling module selects the first capacitor C v1 The current I1 at the first end and the second capacitor C v2 The current I2 at the first terminal and the third capacitor C v2 The current I3 at the second end is because the currents at these positions can respectively reflect the energy transmission, interaction and output of each capacitor and the surrounding components. v1The current at the first end reflects the energy input between the first receiving coil L1 and the first switch tube Q1 and its own charging and discharging state. v2 The current at the first terminal reflects its energy interaction with other components, and the third capacitor C v3 The current at the second end shows its energy output and the connection status with related components. Collecting these currents can provide the control module with accurate working status information of the adjustable capacitor network, so as to achieve accurate adjustment of the equivalent capacitance value.

[0102] See also Figure 4 , Figure 4 The paper presents an equivalent circuit of a highly adaptable wireless charging receiver circuit and a black box circuit suitable for network-type energy storage batteries. Assume that the wireless charging working cycle is T S , the operating angular frequency is ω, and the duty cycle of the first switch tube Q1 is D S1 , the duty cycle of the second switch tube Q2 is D S2 , the duty cycle of the third switch tube Q3 is D S3 , the duty cycle of the fourth switch tube Q4 is D S4 , the duty cycle of the fifth switch Q5 is D S5 , the duty cycle of the sixth switch Q6 is D S6 , the coupling inductance between the receiving coil and the black box transmitting coil is L m , the secondary leakage inductance is L1-L m The leakage inductance in the black box wireless charging parameters is L 1eak .

[0103] See also Figure 5 , Figure 5 It is a working waveform diagram of the switching capacitor of a highly adaptable wireless charging receiving circuit suitable for network-type energy storage batteries.

[0104] In one embodiment, when the wireless charging receiving circuit is operating, each switch tube meets the following constraints:

[0105]

[0106] Where, is the duty cycle of the first switch tube, is the duty cycle of the second switch tube, is the duty cycle of the third switch tube, is the duty cycle of the fourth switch tube, is the duty cycle of the fifth switch tube, is the duty cycle of the sixth switch tube.

[0107] In one embodiment, when the wireless charging receiving circuit is operating, the expected capacitance value of the capacitor corresponding to the target switch tube is determined according to the following formula:

[0108]

[0109] Where, is the expected capacitance value of the capacitor, is the basic capacitance of the capacitor, is the duty cycle of the target switch.

[0110] In one embodiment, when the wireless charging receiving circuit after changing the equivalent capacitance value matches the parameters of the wireless charging primary circuit, the wireless charging receiving circuit satisfies the following constraints:

[0111]

[0112]

[0113]

[0114] Where, is the coupling inductance between the first receiving coil and the primary black box transmitting coil, is the secondary side leakage inductance, is the expected capacitance of the first capacitor, is the imaginary unit, The working angular frequency of wireless charging; is the expected capacitance of the second capacitor; is the leakage inductance of the primary black box transmitting coil, is the expected capacitance of the third capacitor.

[0115] In a further embodiment, the MCU control unit is configured to determine the duty cycle of the target switch tube according to the wireless charging primary circuit parameters predicted by the neural network controller, including:

[0116] 1) Receive the leakage inductance of the primary black box transmitting coil predicted by the neural network controller.

[0117] The MCU control unit first obtains the predicted leakage inductance of the primary black box transmitter coil from the neural network controller. Directly measuring the leakage inductance of the primary circuit is difficult due to its complexity. However, the neural network controller uses current sampling data to perform a prediction, indirectly obtaining more accurate leakage inductance information. This step is fundamental to subsequent calculations and control, as the leakage inductance of the primary black box transmitter coil is a key parameter affecting the matching between the wireless charging receiver circuit and the primary circuit.

[0118] 2) Calculate the expected capacitance of each capacitor based on the predicted leakage inductance of the primary black box transmitter coil and the operating parameters of the wireless charging receiver circuit.

[0119] After obtaining the leakage inductance of the primary black box transmitter coil, the MCU control unit combines the operating parameters of the wireless charging receiver circuit itself, such as the coupling inductance between the receiver coil and the black box transmitter coil, and the secondary leakage inductance. Based on relevant mathematical models, it calculates the expected capacitance values for each capacitor in the adjustable capacitor network. For example, in a wireless charging system, to achieve efficient energy transfer, the receiver circuit must resonate with the primary circuit at a specific frequency. The capacitance of the capacitor has a significant impact on the resonant frequency. By calculating the expected capacitance value, the circuit can be brought close to or even to resonance, improving charging efficiency.

[0120] 3) Calculate the duty cycle of the corresponding switch tube based on the expected capacitance of each capacitor.

[0121] In this embodiment, after determining the desired capacitance of each capacitor, the MCU control unit calculates the duty cycle of the corresponding switch based on the relationship between the capacitor and the switch in the adjustable capacitor network and related circuit principles. Because the duty cycle of the switch directly affects the charge and discharge state of the capacitor, and thus determines the capacitor's equivalent capacitance, by accurately calculating the duty cycle, the MCU control unit can output appropriate control signals to the control terminals of the switch to achieve the desired equivalent capacitance. Ultimately, this achieves parameter matching between the wireless charging receiver circuit and the wireless charging primary circuit, ensuring efficient and stable wireless charging.

[0122] Specifically, Figure 1 Taking the main circuit structure shown as an example, the current sampling module is responsible for collecting the current waveforms I1, I2, and I3 flowing through each capacitor. The neural network controller then inputs the control laws corresponding to different operating points obtained by the model prediction solution into the neural network training. The weight parameters are adjusted based on the current sampling data and the historical test data set. The MCU control unit then adjusts the duty cycle of each switch tube. Specifically, the wireless charging receiving circuit can change the capacitance of the switch capacitor by adjusting the switch tube duty cycle. It simultaneously samples the current at three different locations. Combined with the test data set, the neural network control strategy is used to quickly predict the leakage inductance in the black box in the MCU. Six control signals are dynamically calculated in real time to change the external capacitance of the switch capacitor to match the wireless charging parameters of the primary black box, thereby improving charging efficiency and reducing heat generation.

[0123] An embodiment of the present invention also provides a meshed energy storage battery, including a meshed charging module, and also includes a highly adaptable wireless charging receiving circuit suitable for the meshed energy storage battery as described in the aforementioned embodiment, wherein the output end of the wireless charging receiving circuit is connected to the input end of the meshed charging module.

[0124] The highly adaptable wireless charging receiving circuit includes:

[0125] Wireless charging receiving circuit and control module;

[0126] The wireless charging receiving circuit includes an adjustable capacitor network;

[0127] The adjustable capacitor network includes a capacitor and a switch tube for controlling the charge and discharge state of the capacitor;

[0128] The output end of the control module is electrically connected to the control end of the switch tube in the wireless charging receiving circuit;

[0129] The control module is used to collect the operating parameters of the wireless charging receiving circuit and determine the target switch tube duty cycle required to change the equivalent capacitance value of the adjustable capacitor network based on the operating parameters; it is also used to output a control signal to the control end of the switch tube to change the charging and discharging state of the capacitor in the circuit according to the target switch tube duty cycle, thereby changing the equivalent capacitance value of the adjustable capacitor network, so that the wireless charging receiving circuit after the equivalent capacitance value is changed matches the parameters of the wireless charging primary circuit.

[0130] Furthermore, the control module includes:

[0131] Current sampling module, neural network controller and MCU control unit;

[0132] The current sampling module is used to collect the current flowing through each capacitor in the adjustable capacitor network;

[0133] The neural network controller is used to predict the parameters of the wireless charging primary circuit using a pre-trained neural network model based on the current data collected by the current sampling module;

[0134] The MCU control unit is used to determine the duty cycle of the target switch tube based on the wireless charging primary circuit parameters predicted by the neural network controller, and output a control signal to the control end of the corresponding switch tube, thereby changing the capacitance of the corresponding capacitor to the desired capacitance.

[0135] Furthermore, the wireless charging receiving circuit includes:

[0136] a first receiving coil and an adjustable capacitor network;

[0137] The adjustable capacitor network includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a first capacitor, a second capacitor and a third capacitor;

[0138] The first end of the first receiving coil is connected to the first end of the first capacitor and the first end of the first switching tube;

[0139] The second end of the first switching tube is connected to the first end of the second switching tube;

[0140] The second end of the second switch tube is connected to the second end of the first capacitor, the first end of the second capacitor, the first end of the third switch tube, and the first end of the fifth switch tube;

[0141] The second end of the third switch tube is connected to the first end of the fourth switch tube;

[0142] The second end of the second capacitor is connected to the second end of the fourth switch tube;

[0143] The second end of the fifth switch tube is connected to the first end of the sixth switch tube;

[0144] The second end of the third capacitor is connected to the second end of the sixth switch tube;

[0145] The second end of the first receiving coil is connected to the second end of the four switching tubes;

[0146] The first receiving coil serves as an input end of the wireless charging receiving circuit;

[0147] The second ends of the four switch tubes and the second end of the sixth switch tube serve as output ends of the wireless charging receiving circuit.

[0148] Furthermore, the input end of the wireless charging receiving circuit is coupled and inductively connected to the black box transmitting coil, and the output end of the wireless charging receiving circuit is connected to the meshed charging module.

[0149] Furthermore, the current flowing through each capacitor in the adjustable capacitor network collected by the current sampling module includes:

[0150] a current at a first terminal of the first capacitor, a current at a first terminal of the second capacitor, and a current at a second terminal of the third capacitor.

[0151] Furthermore, when the wireless charging receiving circuit is working, each switch tube meets the following constraints:

[0152]

[0153] Where, is the duty cycle of the first switch tube, is the duty cycle of the second switch tube, is the duty cycle of the third switch tube, is the duty cycle of the fourth switch tube, is the duty cycle of the fifth switch tube, is the duty cycle of the sixth switch tube.

[0154] Furthermore, when the wireless charging receiving circuit is operating, the expected capacitance of the capacitor corresponding to the target switch tube is determined according to the following formula:

[0155]

[0156] Where, is the expected capacitance value of the capacitor, is the basic capacitance of the capacitor, is the duty cycle of the target switch.

[0157] Furthermore, when the wireless charging receiving circuit after changing the equivalent capacitance value matches the parameters of the wireless charging primary circuit, the wireless charging receiving circuit satisfies the following constraints:

[0158]

[0159]

[0160]

[0161] Where, is the coupling inductance between the first receiving coil and the primary black box transmitting coil, is the secondary side leakage inductance, is the expected capacitance of the first capacitor, is the imaginary unit, The working angular frequency of wireless charging; is the expected capacitance of the second capacitor; is the leakage inductance of the primary black box transmitting coil, is the expected capacitance of the third capacitor.

[0162] Furthermore, the MCU control unit is used to determine the duty cycle of the target switch tube according to the wireless charging primary circuit parameters predicted by the neural network controller, including:

[0163] Receive the leakage inductance of the primary black box transmitter coil predicted by the neural network controller;

[0164] Calculate the expected capacitance of each capacitor based on the predicted leakage inductance of the primary black box transmitter coil and the operating parameters of the wireless charging receiver circuit.

[0165] Calculate the duty cycle of the corresponding switch tube according to the expected capacitance of each capacitor.

[0166] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0167] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0168] In the embodiments disclosed in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0169] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A highly adaptable wireless charging receiving circuit suitable for network-type energy storage batteries, characterized in that: include: Wireless charging receiving circuit and control module; The wireless charging receiving circuit includes an adjustable capacitor network; The adjustable capacitor network includes a capacitor and a switch tube for controlling the charge and discharge state of the capacitor; The output end of the control module is electrically connected to the control end of the switch tube in the wireless charging receiving circuit; The control module is used to collect operating parameters of the wireless charging receiving circuit and determine, based on the operating parameters, a target switch tube duty cycle required to change the equivalent capacitance value of the adjustable capacitor network; and is further used to output a control signal to the control end of the switch tube to change the charge and discharge state of the capacitor in the circuit according to the target switch tube duty cycle, thereby changing the equivalent capacitance value of the adjustable capacitor network, so that the wireless charging receiving circuit after the equivalent capacitance value is changed matches the parameters of the wireless charging primary circuit.

2. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 1, characterized in that: The control module includes: Current sampling module, neural network controller and MCU control unit; The current sampling module is used to collect the current flowing through each capacitor in the adjustable capacitor network; The neural network controller is used to predict the parameters of the wireless charging primary circuit using a pre-trained neural network model based on the current data collected by the current sampling module; The MCU control unit is used to determine the duty cycle of the target switch tube according to the wireless charging primary circuit parameters predicted by the neural network controller, and output a control signal to the control terminal of the corresponding switch tube, thereby changing the capacitance of the corresponding capacitor to the desired capacitance.

3. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 2, characterized in that: The wireless charging receiving circuit includes: a first receiving coil and said adjustable capacitive network; The adjustable capacitor network includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a first capacitor, a second capacitor and a third capacitor; The first end of the first receiving coil is connected to the first end of the first capacitor and the first end of the first switching tube; The second end of the first switching tube is connected to the first end of the second switching tube; The second end of the second switch tube is connected to the second end of the first capacitor, the first end of the second capacitor, the first end of the third switch tube, and the first end of the fifth switch tube; The second end of the third switch tube is connected to the first end of the fourth switch tube; The second end of the second capacitor is connected to the second end of the fourth switch tube; The second end of the fifth switching tube is connected to the first end of the sixth switching tube; The second end of the third capacitor is connected to the second end of the sixth switch tube; The second end of the first receiving coil is connected to the second ends of the four switching tubes; The first receiving coil serves as an input end of the wireless charging receiving circuit; The second ends of the four switch tubes and the second end of the sixth switch tube serve as output ends of the wireless charging receiving circuit.

4. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 3, characterized in that: The input end of the wireless charging receiving circuit is coupled and inductively connected to the black box transmitting coil, and the output end of the wireless charging receiving circuit is connected to the meshed charging module.

5. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 3, characterized in that: The current flowing through each capacitor in the adjustable capacitor network collected by the current sampling module includes: The current at the first terminal of the first capacitor, the current at the first terminal of the second capacitor, and the current at the second terminal of the third capacitor.

6. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 3, characterized in that: When the wireless charging receiving circuit is working, each switch tube meets the following constraints: Where, is the duty cycle of the first switch tube, is the duty cycle of the second switch tube, is the duty cycle of the third switch tube, is the duty cycle of the fourth switch tube, is the duty cycle of the fifth switch tube, is the duty cycle of the sixth switching tube.

7. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 3, characterized in that: When the wireless charging receiving circuit is working, the expected capacitance value of the capacitor corresponding to the target switch tube is determined according to the following formula: Where, is the desired capacitance value of the capacitor, is the basic capacitance of the capacitor, is the duty cycle of the target switch tube.

8. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 3, characterized in that: When the wireless charging receiving circuit after changing the equivalent capacitance value matches the parameters of the wireless charging primary circuit, the wireless charging receiving circuit satisfies the following constraints: Where, is the coupling inductance between the first receiving coil and the primary black box transmitting coil, is the secondary side leakage inductance, is the expected capacitance of the first capacitor, is the imaginary unit, The working angular frequency of wireless charging; is the expected capacitance of the second capacitor; is the leakage inductance of the primary black box transmitting coil, is the expected capacitance of the third capacitor.

9. The highly adaptable wireless charging receiving circuit suitable for a network-type energy storage battery according to claim 3, characterized in that: The MCU control unit is configured to determine a duty cycle of a target switch tube according to the wireless charging primary circuit parameters predicted by the neural network controller, including: receiving the leakage inductance of the primary side black box transmitting coil predicted by the neural network controller; Calculating expected capacitance values of each capacitor based on the predicted leakage inductance of the primary black box transmitting coil and operating parameters of the wireless charging receiving circuit; Calculate the duty cycle of the corresponding switch tube according to the expected capacitance of each capacitor.

10. A grid-type energy storage battery, comprising a grid-type charging module, characterized in that: It also includes a highly adaptable wireless charging receiving circuit suitable for a meshed energy storage battery as described in any one of claims 1 to 9, and the output end of the wireless charging receiving circuit is connected to the input end of the meshed charging module.

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