Wireless charging circuit

Abstract

The invention discloses a wireless charging circuit. The wireless charging circuit comprises a transmitting end and a receiving end, the receiving end control module stores battery preset parameters, the sampling module collects voltage, current and temperature information, interacts with the transmitting end wireless communication module through the receiving end wireless communication module and transmits the information to the transmitting end control module, and a transmitting end generates a control signal by combining the sampling parameters of the transmitting end to drive the inversion module to output forward or reverse excitation current. An alternating magnetic field is formed through the transmitting end coil resonance module, the receiving end coil resonance module is coupled with the transmitting end coil resonance module, and the alternating magnetic field is induced to generate induced current. According to the circuit, a DC / DC buck-boost conversion control module does not need to be arranged at a receiving end, the heating and the size of a system are reduced, the charging efficiency is improved, the circuit is adaptive to various battery types, efficient and accurate wireless charging control can be realized, and meanwhile, the circuit has the advantages of high compatibility and low cost.

Description

Technical Field

[0001] The present application relates to the field of wireless charging technology, and in particular to a wireless charging circuit. Background Art

[0002] With the increasing popularity of electric vehicles, wireless charging is increasingly being adopted in two-wheeled electric vehicles as a convenient and safe charging method. Existing wireless charging systems typically consist of a transmitter and a receiver. The transmitter generates an alternating magnetic field, while the receiver receives energy through coil coupling and charges the battery. In traditional systems, the receiver typically includes a DC / DC buck-boost converter control module to accommodate battery packs of varying voltage levels.

[0003] However, the circuit structure of the existing technology has the following problems: (1) Complex structure and high hardware cost: The receiving end needs to design different DC / DC buck-boost conversion control modules for different battery configurations, which increases manufacturing and maintenance costs. (2) High power consumption and severe heat generation: The DC / DC buck-boost conversion control module circuit itself has energy loss and is prone to generate significant heat under long-term operation, affecting system stability and life. (3) Poor system compatibility: Each battery requires a specific circuit configuration, which is not conducive to unified design and large-scale application.

[0004] Therefore, how to achieve accurate battery identification and charging control through system information interaction without using a DC / DC buck-boost conversion control circuit at the receiving end has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The present application provides a wireless charging circuit to solve the problems of complex structure, severe heat generation and poor battery compatibility caused by the receiving end of the existing wireless charging system relying on the DC / DC buck-boost conversion control circuit.

[0006] In a first aspect, the present application provides a wireless charging circuit, including a transmitter and a receiver, wherein the transmitter includes a transmitter control module, a high-frequency full-bridge inverter module, a transmitter wireless communication module, a transmitter sampling module, and a transmitter coil resonance module;

[0007] The receiving end includes a receiving end control module, a receiving end coil resonance module, a receiving end sampling module and a receiving end wireless communication module;

[0008] The receiving end control module stores preset battery configuration parameters;

[0009] The receiving end sampling module collects receiving end parameters;

[0010] The receiving end control module transmits the preset battery configuration parameters and the receiving end parameters to the transmitting end control module through interaction with the receiving end wireless communication module;

[0011] The transmitter sampling module collects transmitter parameters and transmits them to the transmitter control module;

[0012] The transmitter control module generates a first control signal and a second control signal according to the received preset battery configuration parameters, the receiving end parameters, and the transmitting end parameters;

[0013] The high-frequency full-bridge inverter module outputs a forward or reverse excitation current to the transmitting-end coil resonance module in response to the first control signal and the second control signal to generate an alternating magnetic field;

[0014] The receiving-end coil resonance module is coupled to the transmitting-end coil resonance module to induce the alternating magnetic field to generate an induced current.

[0015] Optionally, the transmitting end sampling module is electrically connected to the transmitting end control module;

[0016] The transmitter sampling module is used to collect the transmitter parameters and feed the transmitter parameters back to the transmitter control module. The transmitter parameters include the input voltage and input current of the transmitter and the voltage at the port of the transmitter coil resonance module.

[0017] Optionally, the receiving end sampling module is electrically connected to the receiving end control module, and the receiving end control module is electrically connected to the receiving end wireless communication module;

[0018] The receiving end sampling module is used to collect the receiving end parameters and feed the receiving end parameters back to the receiving end control module, wherein the receiving end parameters include charging current, battery voltage and temperature data;

[0019] The receiving end control module transmits the received receiving end parameters and the preset battery configuration parameters stored in the receiving end control module to the receiving end wireless communication module;

[0020] The receiving-end wireless communication module transmits the receiving-end parameters and the preset battery configuration parameters to the transmitting-end control module by interacting with the transmitting-end wireless communication module.

[0021] Optionally, the transmitter control module stores preset battery configuration data corresponding to the preset battery configuration parameters;

[0022] The transmitting end control module searches for corresponding preset battery configuration data according to the received preset battery configuration parameters;

[0023] The transmitter control module generates a first control signal and a second control signal to control the high-frequency full-bridge inverter module based on the received receiver parameters, the transmitter parameters, and the preset battery configuration data, wherein the first control signal and the second control signal have an adjustable duty cycle and operating frequency; the transmitter control module controls the transmitter coil resonance module to generate a controllable high-frequency AC magnetic field by adjusting the duty cycle and frequency of the first control signal and the second control signal, and transmits the magnetic field to the receiver coil resonance module to generate a high-frequency induced current and voltage.

[0024] Optionally, the high-frequency full-bridge inverter module includes a first driver chip and a second driver chip, and a full-bridge circuit consisting of a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor, wherein the MOS transistors are N-channel MOS transistors;

[0025] The first control signal is input to the first driver chip, and the second control signal is input to the second driver chip;

[0026] The transmitter control module controls the MOS tubes in the full-bridge circuit to be alternately turned on and off according to the first control signal and the second control signal, so as to output a forward or reverse excitation current.

[0027] Optionally, the transmitting end coil resonance module includes an LC resonant circuit consisting of a resonant capacitor and an inductor coil connected in series;

[0028] When the first control signal is at a high level, the high-side drive output port of the first driver chip outputs a high level and the low-side drive output port outputs a low level, controlling the first MOS transistor to be turned on and the second MOS transistor to be turned off, thereby outputting a forward excitation current to the transmitting coil resonance module;

[0029] When the first control signal is at a low level, the high-side drive output port of the first driver chip outputs a low level and the low-side drive output port outputs a high level, controlling the first MOS to be disconnected and the second MOS to be turned on, and the resonant capacitor to be grounded.

[0030] Optionally, the transmitting end coil resonance module includes an LC resonant circuit consisting of a resonant capacitor and an inductor coil connected in series;

[0031] When the second control signal is at a high level, the high-side drive output port of the second driver chip outputs a high level and the low-side drive output port outputs a low level, controlling the third MOS transistor to be turned on and the fourth MOS transistor to be turned off, thereby outputting a reverse excitation current to the transmitting-end coil resonance module;

[0032] When the second control signal is at a low level, the high-side drive output port of the second driver chip outputs a low level and the low-side drive output port outputs a high level, controlling the third MOS transistor to be disconnected and the fourth MOS transistor to be turned on, and the inductor coil is grounded.

[0033] Optionally, the receiving end further includes a full-bridge rectifier module;

[0034] The full-bridge rectifier module is connected to the receiving-end coil resonance module to convert the induced current into direct current.

[0035] Optionally, the receiving end further includes a filtering module;

[0036] The filtering module is connected to the full-bridge rectifier module, filters the direct current, and outputs the filtered current to the battery load for charging.

[0037] Optionally, the transmitting end further includes a serial communication module, which is connected to an external charging pile for communication, and the external charging pile supplies power to the transmitting end.

[0038] The technical solution provided by the embodiments of the present application has the following advantages over the prior art: The present application discloses a wireless charging circuit comprising a transmitter and a receiver. A receiver control module stores preset battery parameters, while a sampling module collects voltage, current, and temperature information. The information is transmitted to the transmitter control module via a wireless communication module on the receiver side. The transmitter generates a control signal based on the sampled parameters to drive the inverter module to output a forward or reverse excitation current. The transmitter coil resonant module generates an alternating magnetic field, which is then coupled to the receiver coil resonant module to induce the alternating magnetic field and generate an induced current. This circuit eliminates the need for a DC / DC buck-boost converter control module on the receiver side, reducing system heat generation and size, improving charging efficiency, and adapting to a variety of battery types. This circuit facilitates efficient and accurate wireless charging control while offering high compatibility and low cost. This circuit eliminates the need for a DC / DC buck-boost converter control module on the receiver side, reducing system heat generation and size, improving charging efficiency, and adapting to a variety of battery types. This circuit facilitates efficient and accurate wireless charging control while offering high compatibility and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0040] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0042] Figure 1 A schematic diagram of the module structure of a wireless charging circuit provided in an embodiment of the present application;

[0043] Figure 2 A circuit diagram of a transmitter in a wireless charging circuit according to an embodiment of the present application;

[0044] Figure 3 A schematic diagram of a circuit of a receiving end in a wireless charging circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0047] Figure 1 A schematic diagram of the module structure of a wireless charging circuit provided in an embodiment of the present application.

[0048] The wireless charging circuit of the present application includes a transmitter and a receiver, wherein the transmitter includes a transmitter control module, a high-frequency full-bridge inverter module, a transmitter wireless communication module, a transmitter sampling module and a transmitter coil resonance module;

[0049] The receiving end includes a receiving end control module, a receiving end coil resonance module, a receiving end sampling module and a receiving end wireless communication module;

[0050] The receiving end control module stores preset battery configuration parameters;

[0051] The receiving end sampling module collects receiving end parameters;

[0052] The receiving end control module transmits the preset battery configuration parameters and the receiving end parameters to the transmitting end control module through interaction with the receiving end wireless communication module;

[0053] The transmitter sampling module collects transmitter parameters and transmits them to the transmitter control module;

[0054] The transmitter control module generates a first control signal and a second control signal according to the received preset battery configuration parameters, the receiving end parameters, and the transmitting end parameters;

[0055] The high-frequency full-bridge inverter module outputs a forward or reverse excitation current to the transmitting-end coil resonance module in response to the first control signal and the second control signal to generate an alternating magnetic field;

[0056] The receiving-end coil resonance module is coupled to the transmitting-end coil resonance module to induce the alternating magnetic field to generate an induced current.

[0057] All modules below describe their corresponding Figure 2-Figure 3 You can refer to the middle position Figure 1 The label description, such as Figure 1 As shown, the wireless charging circuit of the present application includes a transmitter 100 and a receiver 200, wherein the transmitter 100 includes a transmitter control module 101, a high-frequency full-bridge inverter module 102, a wireless communication module 103, a transmitter sampling module 104, a transmitter coil resonance module 105, a serial communication module 106, a DC input filter module 107, a transmitter DC / DC+LDO module 108, and a transmitter RGB module 109.

[0058] The receiving end 200 includes a receiving end control module 201, a receiving end coil resonance module 202, a receiving end sampling module 203, a receiving end wireless communication module 204, a full-bridge rectifier module 205, a filter module 206, a rectifier and filter module 207, a receiving end DC / DC+LDO module 208, a receiving end RGB module 209, and a battery load 210.

[0059] The transmitter includes: a transmitter control module for overall control of the wireless charging system; a high-frequency full-bridge inverter module, connected to the transmitter control module, for performing power conversion and outputting an excitation current based on a control signal output by the control module; a transmitter wireless communication module, for exchanging information with a receiver wireless communication module; a transmitter sampling module, for collecting electrical parameters such as the transmitter's input voltage, input current, and the voltage at the transmitter coil coupling port; and a transmitter coil resonance module, connected to the output of the high-frequency full-bridge inverter module, for generating an alternating magnetic field based on the excitation current.

[0060] The receiving end includes: a receiving end control module for receiving control instructions, processing receiving end data, and storing preset battery configuration parameters; a receiving end wireless communication module for transmitting battery configuration parameters and sampled data from the receiving end control module to the transmitting end wireless communication module to achieve information exchange; a receiving end sampling module, connected to the battery pack, for collecting actual charging parameters of the receiving end, including charging current, battery voltage, and temperature; and a receiving end coil resonance module, magnetically coupled to the transmitting end coil resonance module, for receiving an alternating magnetic field and inducing high-frequency alternating current.

[0061] During actual operation, the receiving-end sampling module collects parameters such as the receiving-end charging current, battery voltage, and temperature in real time. The receiving-end control module sends the above-mentioned sampling parameters together with the preset battery configuration parameters stored internally to the transmitting-end control module. The information is transmitted through the wireless link between the receiving-end wireless communication module and the transmitting-end wireless communication module.

[0062] The transmitter sampling module collects operating parameters of the transmitter, including input voltage, input current and coupling port voltage of the transmitter coil resonance module, and transmits the sampled data to the transmitter control module.

[0063] The transmitter control module comprehensively analyzes the current charging stage and load requirements based on the received preset battery configuration parameters, receiver parameters and transmitter parameters, and outputs a first control signal and a second control signal for regulating the switching state of each MOS tube in the high-frequency full-bridge inverter module.

[0064] After receiving the control signals, the high-frequency full-bridge inverter module outputs a forward or reverse excitation current to the transmitter coil resonant module based on the control logic of the first and second control signals, thereby generating an alternating magnetic field of a specific frequency and power. This alternating magnetic field is transmitted to the receiver coil resonant module via spatial magnetic coupling, where the receiver coil generates high-frequency alternating current, providing energy for subsequent rectification, filtering, and charging processes.

[0065] This application dynamically adjusts the charging process through information exchange between the transmitter and receiver. The transmitter outputs the most appropriate excitation signal based on the actual battery type and operating status. The receiver eliminates the need for a DC / DC buck-boost converter module, simplifying the hardware structure, reducing system heat generation, improving charging efficiency, and enhancing compatibility with different battery pack types, making it suitable for applications such as two-wheeled electric vehicles.

[0066] Furthermore, the transmitting end sampling module is electrically connected to the transmitting end control module;

[0067] like Figure 3 As shown, the transmitter sampling module is used to collect the transmitter parameters and feed the transmitter parameters back to the transmitter control module. The transmitter parameters include the input voltage and input current of the transmitter and the voltage at the port of the transmitter coil resonance module.

[0068] In the embodiment of the present application, the transmitter sampling module is electrically connected to the transmitter control module, and is used to perform real-time monitoring and data feedback on the operating status of the transmitter.

[0069] Specifically, the transmitter sampling module is used to collect key electrical parameters of the transmitter, including the transmitter input voltage, input current, and the voltage signal at the coupling port of the transmitter coil resonant module. The input voltage and input current can reflect the overall power input status of the transmitter, and the coupling port voltage is used to evaluate the excitation state and coupling strength of the transmitter coil resonant circuit. The collected parameters are fed back to the transmitter control module via a data path. The transmitter control module analyzes the transmitter parameters together with the battery information and real-time charging parameters uploaded by the receiver to generate the PWM control signal that controls the high-frequency full-bridge inverter module.

[0070] This data feedback mechanism forms part of the transmitter's closed-loop control, helping to dynamically adjust the waveform, frequency, and duty cycle of the excitation current, thereby improving the efficiency and stability of wireless energy transmission.

[0071] Furthermore, the receiving end sampling module is electrically connected to the receiving end control module, and the receiving end control module is electrically connected to the receiving end wireless communication module;

[0072] The receiving end sampling module is used to collect the receiving end parameters and feed the receiving end parameters back to the receiving end control module, wherein the receiving end parameters include charging current, battery voltage and temperature data;

[0073] The receiving end control module transmits the received receiving end parameters and the preset battery configuration parameters stored in the receiving end control module to the receiving end wireless communication module;

[0074] The receiving-end wireless communication module transmits the receiving-end parameters and the preset battery configuration parameters to the transmitting-end control module by interacting with the transmitting-end wireless communication module.

[0075] In the embodiments of this application, Figure 2 As shown, the receiving end sampling module is electrically connected to the receiving end control module, and the receiving end control module is further electrically connected to the receiving end wireless communication module, for realizing monitoring of the working status of the receiving end, data processing and wireless transmission.

[0076] Specifically, the receiver sampling module is used to collect key parameters during the receiver's operation in real time, including charging current, battery voltage, and battery temperature data. These parameters can reflect the battery's state characteristics at different charging stages and help achieve dynamic adjustment of the charging process.

[0077] The receiver sampling module feeds the collected receiver parameters back to the receiver control module, which processes the received data and calls upon its internally stored preset battery configuration parameters. Battery configuration parameters can include information such as target charging voltage, upper current limit, temperature threshold, and charging stage control curves to match the charging requirements of specific battery types.

[0078] The receiving-end control module transmits the aforementioned receiving-end parameters and preset battery configuration parameters to the receiving-end wireless communication module. The receiving-end wireless communication module establishes a communication connection with the transmitting-end wireless communication module via a wireless link and sends the data to the transmitting-end control module. The transmitting-end control module, based on the received receiving-end information and the input voltage, current, and other parameters provided by the transmitting-end sampling module, generates a PWM control signal adapted to the current battery type, enabling precise control of the transmitting-end high-frequency full-bridge inverter module. This communication mechanism enables the transmitter to monitor and remotely control the receiving-end charging status in real time, enhancing the intelligence of the charging process and the safety of battery charging.

[0079] Furthermore, the transmitting end control module searches for corresponding preset battery configuration data according to the received preset battery configuration parameters;

[0080] The transmitter control module generates a first control signal and a second control signal to control the high-frequency full-bridge inverter module based on the received receiver parameters, the transmitter parameters, and the preset battery configuration data, wherein the first control signal and the second control signal have adjustable duty cycles and operating frequencies;

[0081] The transmitting end control module controls the transmitting end coil resonance module to generate a controllable high-frequency AC magnetic field by adjusting the duty cycle and frequency of the first control signal and the second control signal, and transmits the high-frequency induced current and voltage to the receiving end coil resonance module.

[0082] In an embodiment of the present application, the transmitter control module is used to control the high-frequency full-bridge inverter module to achieve dynamic regulation of wireless energy transmission. Specifically, the transmitter control module receives the receiver parameters and preset battery configuration parameters transmitted from the receiver wireless communication module, wherein the receiver parameters include charging current, battery voltage and temperature data, and the preset battery configuration parameters refer to the type characteristic code generated according to the battery voltage and chemical properties of two-wheeled electric vehicles on the market, such as 36V / 20AH lead-acid battery, 48V / 20AH lead-acid battery, 60V / 20AH lead-acid battery, 70V / 20AH lead-acid battery, 48V / 20Ah ternary lithium battery, 48V / 20AH lithium iron phosphate battery. The transmitter control module stores the preset battery configuration data corresponding to the preset battery configuration parameters, and calls the preset battery configuration data stored in itself according to the preset battery configuration parameters.

[0083] At the same time, the transmitter control module also receives transmitter parameters collected by the transmitter sampling module, including: input voltage, input current and the voltage at the port of the transmitter coil resonance module.

[0084] The transmitter control module combines the three types of data receiving end parameters, transmitter parameters, and preset battery configuration data, and generates a first control signal and a second control signal according to the requirements of the current charging stage, and sends them to the high-frequency full-bridge inverter module. The first control signal and the second control signal are PWM signals with an adjustable duty cycle and operating frequency, which are used to control the on and off states of the MOS tube inside the inverter module. By adjusting the duty cycle and frequency of the control signal, the transmitter control module can control the high-frequency full-bridge inverter module to output a forward or reverse excitation current, thereby adjusting the waveform and amplitude of the high-frequency AC current in the transmitter coil resonance module. Under the action of the excitation current, the transmitter coil resonance module generates a high-frequency alternating magnetic field, which is transmitted to the receiver coil resonance module through spatial magnetic coupling. The latter induces a high-frequency induced current and voltage for subsequent rectification and charging.

[0085] In this embodiment, the duty cycle and frequency of the control signal can be adjusted in real time according to the charging stage (such as pre-charging, constant current, constant voltage, and trickle charging), thereby meeting the control requirements of charging voltage and current for various battery types and improving the compatibility, efficiency, and safety of the wireless charging system.

[0086] Furthermore, the high-frequency full-bridge inverter module includes a first driver chip and a second driver chip, and a full-bridge circuit consisting of a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor, wherein the MOS transistors are N-channel MOS transistors;

[0087] The first control signal is input to the first driver chip, and the second control signal is input to the second driver chip;

[0088] The transmitter control module controls the MOS tubes in the full-bridge circuit to be alternately turned on and off according to the first control signal and the second control signal, so as to output a forward or reverse excitation current.

[0089] In this embodiment, the high-frequency full-bridge inverter module is used to convert the PWM control signal output by the transmitter control module into an excitation current to drive the transmitter coil resonant module to generate a high-frequency alternating magnetic field. Specifically, the high-frequency full-bridge inverter module includes a first driver chip and a second driver chip, respectively, for receiving a first control signal and a second control signal from the transmitter control module. The full-bridge power devices are composed of a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor, all of which are N-channel MOS transistors.

[0090] The first driver chip controls the on / off switching of the first and second MOS transistors, while the second driver chip controls the on / off switching of the third and fourth MOS transistors. The transmitter control module inputs a first control signal and a second control signal to the first and second driver chips, respectively. Both signals are PWM waveforms with adjustable duty cycle and frequency.

[0091] During the specific operation, the transmitter control module turns on and off the above four MOS tubes in an alternating manner according to the preset control logic: when the first control signal is at a high level, the first MOS tube is turned on and the second MOS tube is turned off; when the first control signal is at a low level, the first MOS tube is turned off and the second MOS tube is turned on; when the second control signal is at a high level, the third MOS tube is turned on and the fourth MOS tube is turned off; when the second control signal is at a low level, the third MOS tube is turned on and the fourth MOS tube is turned on.

[0092] Through this control, the inverter module can output forward and reverse excitation currents to the transmitter coil resonant module, thereby adjusting the direction and amplitude of the resulting alternating magnetic field. This inverter structure utilizes the high-frequency, high-efficiency switching characteristics of N-channel MOS transistors. Combined with a dual-driver chip design, it achieves high-speed response and stable control, improving the overall magnetic field control accuracy and charging efficiency of the system.

[0093] Furthermore, the transmitting coil resonance module includes an LC resonance circuit consisting of a resonant capacitor and an inductor coil connected in series;

[0094] When the first control signal is at a high level, the high-side drive output port of the first driver chip outputs a high level and the low-side drive output port outputs a low level, controlling the first MOS transistor to be turned on and the second MOS transistor to be turned off, thereby outputting a forward excitation current to the transmitting coil resonance module;

[0095] When the first control signal is at a low level, the high-side drive output port of the first driver chip outputs a low level and the low-side drive output port outputs a high level, controlling the first MOS to be disconnected and the second MOS to be turned on, and the resonant capacitor to be grounded.

[0096] In the embodiment of the present application, in this embodiment, the transmitting end coil resonance module is used to respond to the excitation signal of the high-frequency full-bridge inverter module to form a high-frequency alternating magnetic field to achieve wireless energy transmission.

[0097] The transmitter coil resonant module consists of a resonant capacitor and an inductor connected in series, forming an LC resonant circuit. This circuit is designed to achieve efficient resonance at a specific frequency to enhance magnetic field strength and improve energy transmission efficiency.

[0098] In terms of control logic, the transmitter control module outputs a first control signal to the first driver chip to control the switching states of the first MOS transistor and the second MOS transistor connected to one side of the high-frequency full-bridge inverter module: when the first control signal is high, the high-side drive output port (HO) of the first driver chip outputs a high level, and the low-side drive output port (LO) outputs a low level. At this time, the first MOS transistor is turned on and the second MOS transistor is turned off. The high-frequency full-bridge inverter module outputs a forward excitation current to the transmitter coil resonance module, so that the LC resonant circuit starts to establish a high-frequency forward magnetic field.

[0099] When the first control signal is low, the HO output of the first driver chip is low and the LO output is high. At this time, the first MOS transistor is disconnected and the second MOS transistor is turned on. One end of the resonant capacitor is pulled down to the ground potential, and the LC circuit completes the energy feedback closed path, forming an effective oscillation maintenance condition.

[0100] Through the above control method, the transmitter control module can adjust the duty cycle and frequency of the first control signal according to the battery parameters and real-time feedback data transmitted by the receiver, and further control the current waveform and magnetic field characteristics in the LC resonant circuit, thereby achieving precise control of the direction and amplitude of wireless energy output.

[0101] Furthermore, the transmitting coil resonance module includes an LC resonance circuit consisting of a resonant capacitor and an inductor coil connected in series;

[0102] When the second control signal is at a high level, the high-side drive output port of the second driver chip outputs a high level and the low-side drive output port outputs a low level, controlling the third MOS transistor to be turned on and the fourth MOS transistor to be turned off, thereby outputting a reverse excitation current to the transmitting-end coil resonance module;

[0103] When the second control signal is at a low level, the high-side drive output port of the second driver chip outputs a low level and the low-side drive output port outputs a high level, controlling the third MOS transistor to be disconnected and the fourth MOS transistor to be turned on, and the inductor coil is grounded.

[0104] In this embodiment of the present application, the transmitting coil resonance module comprises a resonant capacitor and an inductor connected in series to form an LC resonant circuit, which is used to achieve resonant excitation of a high-frequency magnetic field. The LC circuit generates a positive or negative excitation current in response to a first control signal and a second control signal, respectively.

[0105] Under the action of the second control signal, the transmitter control module controls the second driver chip to output a corresponding logic level to drive the switching state of the third MOS transistor and the fourth MOS transistor in the high-frequency full-bridge inverter module: when the second control signal is high, the high-side drive output port (HO) of the second driver chip outputs a high level, and the low-side drive output port (LO) outputs a low level. At this time, the third MOS transistor is turned on and the fourth MOS transistor is turned off. The high-frequency full-bridge inverter module outputs a reverse excitation current to the transmitter coil resonance module, driving the LC resonant circuit to form an alternating magnetic field with an excitation current of opposite polarity.

[0106] When the second control signal is at a low level, the HO output of the second driver chip is low and the LO output is high. At this time, the third MOS transistor is disconnected and the fourth MOS transistor is turned on. One end of the inductor coil is pulled to the ground potential, completing the current loop of the LC circuit, so that the resonant state is maintained and current commutation is performed.

[0107] Through the above control method, the transmitter control module can flexibly adjust the duty cycle and frequency of the second control signal according to the charging control requirements of different stages, thereby accurately controlling the current direction and power amplitude in the LC circuit, and realizing switching control of the wireless energy output direction.

[0108] This solution operates in conjunction with the first control signal to achieve positive / reverse alternating excitation in a high-frequency full-bridge inverter structure, thereby forming a stable and controllable high-frequency alternating magnetic field in the transmitting coil resonance module, effectively improving the energy induction efficiency of the receiving end and meeting the electrical requirements of multi-stage charging.

[0109] Furthermore, the receiving end further includes a full-bridge rectifier module and a filter module;

[0110] The full-bridge rectifier module is connected to the receiving-end coil resonance module to convert the induced current into direct current.

[0111] The receiving end also includes the filtering module connected to the full-bridge rectifier module to filter the direct current and output the filtered current to the battery load for charging.

[0112] In an embodiment of the present application, the receiving end further includes a full-bridge rectifier module and a filter module, which are used to convert the received high-frequency induced electrical energy into stable DC electrical energy and output it to the battery load. The receiving end coil resonance module and the transmitting end coil resonance module transmit energy through spatial magnetic coupling. When the high-frequency alternating magnetic field generated by the transmitting end coil is induced by the receiving end coil, the receiving end coil resonance module outputs a high-frequency AC current. The receiving end coil resonance module is electrically connected to a full-bridge rectifier module, which is used to convert the high-frequency AC induced current into DC current. The rectifier module adopts a bridge structure and completes the unidirectional current by controlling the conduction direction of the diode, eliminating the AC component.

[0113] The filter module is connected to the full-bridge rectifier module and is used to filter the rectified DC power. The filter module usually includes a parallel filter capacitor and a series filter inductor to suppress the ripple component in the rectified current and improve the stability and smoothness of the output voltage. The stable DC power after filtering is output to the connected battery load to charge the battery. This structure can achieve stable and reliable power supply for various types of batteries (such as lead-acid batteries, lithium batteries, etc.), which is conducive to improving the practicality and compatibility of the entire wireless charging system.

[0114] The rectification and filtering circuit in this embodiment does not require a DC-DC buck-boost conversion module, which simplifies the receiving end circuit structure, reduces the volume and power consumption, helps reduce heat generation, and improves the overall efficiency of the charging system.

[0115] Furthermore, the transmitting end also includes a serial communication module, which is connected to an external charging pile through the serial communication module for communication, and the external charging pile supplies power to the transmitting end.

[0116] In an embodiment of the present application, the battery load output terminal of the receiving end is connected to the battery pack on a small electric vehicle such as a two-wheeled electric vehicle, and the transmitting end device is connected to the installed charging station master computer through a serial communication module, generally using RS485 / CAN bus to form a network for communication, and the AC-DC module in the charging station master computer supplies power to the connected transmitting end.

[0117] The circuit of the present application also includes a DC input filter module for filtering the input DC voltage to obtain a purer 48V voltage; a transmitter DC / DC+LDO module for stepping down the stable 48VDC DC voltage to 3.3V; a transmitter RGB module and a receiver RGB module for feedback of the operating status of each module through RGB indicator lights; a rectifier filter module for converting the high-frequency AC power output by the receiver resonant module into low-voltage DC power; and a receiver DC / DC+LDO module for stabilizing the low-voltage DC power output by the rectifier filter module at 3.3V to power the receiver control module or as a reference voltage for the sampling module.

[0118] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0119] 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.

[0120] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application 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.

[0121] In the embodiments provided in this 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 illustrative. 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.

[0122] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0123] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0124] The present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed through a computer program product. When the computer program product is run on a terminal device, the terminal device can implement the steps in the above-mentioned method embodiments when executing.

[0125] The above embodiments are intended only to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application and should be included within the scope of protection of the present application.

Claims

1. A wireless charging circuit, comprising a transmitting end and a receiving end, characterized in that: The transmitter includes a transmitter control module, a high-frequency full-bridge inverter module, a transmitter wireless communication module, a transmitter sampling module and a transmitter coil resonance module; The receiving end includes a receiving end control module, a receiving end coil resonance module, a receiving end sampling module and a receiving end wireless communication module; The receiving end control module stores preset battery configuration parameters; The receiving end sampling module collects receiving end parameters; The receiving end control module transmits the preset battery configuration parameters and the receiving end parameters to the transmitting end control module through interaction with the receiving end wireless communication module; The transmitter sampling module collects transmitter parameters and transmits them to the transmitter control module; The transmitter control module generates a first control signal and a second control signal according to the received preset battery configuration parameters, the receiving end parameters, and the transmitting end parameters; The high-frequency full-bridge inverter module outputs a forward or reverse excitation current to the transmitting-end coil resonance module in response to the first control signal and the second control signal to generate an alternating magnetic field; The receiving-end coil resonance module is coupled to the transmitting-end coil resonance module to induce the alternating magnetic field to generate an induced current.

2. The wireless charging circuit according to claim 1, wherein: The transmitting end sampling module is electrically connected to the transmitting end control module; The transmitter sampling module is used to collect the transmitter parameters and feed the transmitter parameters back to the transmitter control module. The transmitter parameters include the input voltage and input current of the transmitter and the voltage at the port of the transmitter coil resonance module.

3. The wireless charging circuit according to claim 2, wherein: The receiving end sampling module is electrically connected to the receiving end control module, and the receiving end control module is electrically connected to the receiving end wireless communication module; The receiving end sampling module is used to collect the receiving end parameters and feed the receiving end parameters back to the receiving end control module, wherein the receiving end parameters include charging current, battery voltage and temperature data; The receiving end control module transmits the received receiving end parameters and the preset battery configuration parameters stored in the receiving end control module to the receiving end wireless communication module; The receiving-end wireless communication module transmits the receiving-end parameters and the preset battery configuration parameters to the transmitting-end control module by interacting with the transmitting-end wireless communication module.

4. The wireless charging circuit according to claim 3, wherein: The transmitter control module stores preset battery configuration data corresponding to the preset battery configuration parameters; The transmitting end control module searches for corresponding preset battery configuration data according to the received preset battery configuration parameters; The transmitter control module generates a first control signal and a second control signal to control the high-frequency full-bridge inverter module based on the received receiver parameters, the transmitter parameters, and the preset battery configuration data, wherein the first control signal and the second control signal have adjustable duty cycles and operating frequencies; The transmitting end control module controls the transmitting end coil resonance module to generate a controllable high-frequency AC magnetic field by adjusting the duty cycle and frequency of the first control signal and the second control signal, and transmits the high-frequency induced current and voltage to the receiving end coil resonance module.

5. The wireless charging circuit according to claim 4, characterized in that: The high-frequency full-bridge inverter module includes a first driver chip and a second driver chip, and a full-bridge circuit composed of a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor, wherein the MOS transistors are N-channel MOS transistors; The first control signal is input to the first driver chip, and the second control signal is input to the second driver chip; The transmitter control module controls the MOS tubes in the full-bridge circuit to be alternately turned on and off according to the first control signal and the second control signal, so as to output a forward or reverse excitation current.

6. The wireless charging circuit according to claim 5, characterized in that: The transmitting coil resonance module includes an LC resonant circuit consisting of a resonant capacitor and an inductor coil connected in series; When the first control signal is at a high level, the high-side drive output port of the first driver chip outputs a high level and the low-side drive output port outputs a low level, controlling the first MOS transistor to be turned on and the second MOS transistor to be turned off, thereby outputting a forward excitation current to the transmitting coil resonance module; When the first control signal is at a low level, the high-side drive output port of the first driver chip outputs a low level and the low-side drive output port outputs a high level, controlling the first MOS to be disconnected and the second MOS to be turned on, and the resonant capacitor to be grounded.

7. The wireless charging circuit according to claim 5, wherein: The transmitting coil resonance module includes an LC resonant circuit consisting of a resonant capacitor and an inductor coil connected in series; When the second control signal is at a high level, the high-side drive output port of the second driver chip outputs a high level and the low-side drive output port outputs a low level, controlling the third MOS transistor to be turned on and the fourth MOS transistor to be turned off, thereby outputting a reverse excitation current to the transmitting-end coil resonance module; When the second control signal is at a low level, the high-side drive output port of the second driver chip outputs a low level and the low-side drive output port outputs a high level, controlling the third MOS transistor to be disconnected and the fourth MOS transistor to be turned on, and the inductor coil is grounded.

8. The wireless charging circuit according to claim 1, wherein: The receiving end also includes a full-bridge rectifier module; The full-bridge rectifier module is connected to the receiving-end coil resonance module to convert the induced current into direct current.

9. The wireless charging circuit according to claim 8, wherein: The receiving end also includes a filtering module; The filtering module is connected to the full-bridge rectifier module, filters the direct current, and outputs the filtered current to the battery load for charging.

10. The wireless charging circuit according to claim 1, wherein: The transmitting end further includes a serial communication module, which is connected to an external charging pile for communication through the serial communication module, and the external charging pile supplies power to the transmitting end.

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