A wireless charging circuit

Abstract

The application discloses a wireless charging circuit, including 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, and interacts with the transmitting end wireless communication module through the receiving end wireless communication module, and transmits to the transmitting end control module. The transmitting end combines the sampling parameters to generate a control signal to drive the inverter module to output forward or reverse excitation current, and forms an alternating magnetic field through the transmitting end coil resonance module. The receiving end coil resonance module is coupled with the transmitting end coil resonance module, and the induced alternating magnetic field generates an induced current. The circuit does not need to set a DC / DC step-down conversion control module at the receiving end, reduces system heating and volume, improves charging efficiency and adapts to various battery types, helps to realize efficient and accurate wireless charging control, and has high compatibility and low cost advantage.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and more particularly to a wireless charging circuit. Background Technology

[0002] With the increasing popularity of electric vehicles, wireless charging, as a convenient and safe charging method, is gradually being applied to two-wheeled electric vehicles. Existing wireless charging systems typically include a transmitter and a receiver. The transmitter is responsible for generating an alternating magnetic field, while the receiver receives energy and charges the battery through coil coupling. In traditional systems, the receiver usually includes a DC / DC buck-boost conversion control module to adapt to battery packs of different voltage levels.

[0003] However, the existing circuit structure has the following problems: (1) Complex structure and high hardware cost: The receiver needs to be designed with different DC / DC buck-boost conversion control modules for different batteries, which increases manufacturing and maintenance costs. (2) High power consumption and serious heat generation: The DC / DC buck-boost conversion control module circuit itself has energy loss and is prone to generating significant heat under long-term operation, affecting system stability and lifespan. (3) Poor system compatibility: Each battery needs to be configured with a specific circuit, 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 receiver-side DC / DC buck-boost conversion control circuit has become an urgent technical problem to be solved. Summary of the Invention

[0005] This application provides a wireless charging circuit to solve the problems of complex structure, severe heat generation, and poor battery compatibility caused by the reliance on DC / DC buck-boost conversion control circuits at the receiver in existing wireless charging systems.

[0006] In a first aspect, this application provides a wireless charging circuit, including a transmitter and a receiver. 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 resonant 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 receiver control module stores preset battery configuration parameters;

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

[0010] The receiving end control module interacts with the transmitting end wireless communication module to transmit the preset battery configuration parameters and the receiving end parameters to the transmitting end control 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 based on the received preset battery configuration parameters, receiver parameters, and transmitter parameters.

[0013] The high-frequency full-bridge inverter module responds to the first control signal and the second control signal, and outputs a positive or reverse excitation current to the transmitting coil resonant module to generate an alternating magnetic field.

[0014] The receiving coil resonant module is coupled to the transmitting coil resonant module, and generates an induced current by sensing the alternating magnetic field.

[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 them 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 resonant 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 its own stored preset battery configuration parameters to the receiving end wireless communication module.

[0020] The receiving end wireless communication module interacts with the transmitting end wireless communication module to transmit the receiving end parameters and the preset battery configuration parameters to the transmitting end control module.

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

[0022] The transmitter control module searches for the corresponding preset battery configuration data based on the received preset battery configuration parameters;

[0023] The transmitter control module generates a first control signal and a second control signal based on the received receiver parameters, transmitter parameters, and preset battery configuration data to control the high-frequency full-bridge inverter module. The first control signal and the second control signal have adjustable duty cycles and operating frequencies. By adjusting the duty cycles and frequencies of the first control signal and the second control signal, the transmitter control module controls the transmitter coil resonant module to generate a controllable high-frequency AC magnetic field, which is then conducted to the receiver coil resonant module to generate 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, as well as a full-bridge circuit composed of a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET, wherein the MOSFETs are N-channel MOSFETs;

[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 transistors in the full-bridge circuit to alternately turn on and off according to the first control signal and the second control signal, so as to output forward or reverse excitation current.

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

[0028] When the first control signal is high, 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 to turn on and the second MOS to turn off, and outputting a positive excitation current to the transmitter coil resonant module.

[0029] When the first control signal is low, 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 turn off and the second MOS to turn on, and the resonant capacitor to be grounded.

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

[0031] When the second control signal is high, 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, and outputting a reverse excitation current to the transmitter coil resonant module.

[0032] When the second control signal is low, 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 turn off and the fourth MOS transistor to turn on, and the inductor coil to be grounded.

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

[0034] The full-bridge rectifier module is connected to the receiving coil resonant 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 to filter the DC power and output the filtered current to the battery load for charging.

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

[0038] Compared with the prior art, the technical solution provided in this application has the following advantages: This application discloses a wireless charging circuit, including a transmitter and a receiver. The receiver control module stores preset battery parameters, and the sampling module collects voltage, current, and temperature information. This information is transmitted to the transmitter control module via the receiver wireless communication module and the transmitter wireless communication module. The transmitter combines its own sampling parameters to generate a control signal to drive the inverter module to output a forward or reverse excitation current. An alternating magnetic field is formed through the transmitter coil resonant module. The receiver coil resonant module is coupled to the transmitter coil resonant module, inducing an induced current by sensing the alternating magnetic field. This circuit eliminates the need for a DC / DC buck-boost conversion control module at the receiver, reducing system heat generation and size, improving charging efficiency, and adapting to various battery types. It helps achieve efficient and precise wireless charging control while possessing high compatibility and low cost advantages. Attached Figure Description

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

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

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

[0043] Figure 2 A circuit diagram of the transmitter in the wireless charging circuit provided in the embodiments of this application;

[0044] Figure 3 This is a circuit diagram of the receiver in the wireless charging circuit provided in an embodiment of this application. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

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

[0048] The wireless charging circuit of this application includes a transmitter and a receiver. 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 resonant 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 receiver control module stores preset battery configuration parameters;

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

[0052] The receiving end control module interacts with the transmitting end wireless communication module to transmit the preset battery configuration parameters and the receiving end parameters to the transmitting end control 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 based on the received preset battery configuration parameters, receiver parameters, and transmitter parameters.

[0055] The high-frequency full-bridge inverter module responds to the first control signal and the second control signal, and outputs a positive or reverse excitation current to the transmitting coil resonant module to generate an alternating magnetic field.

[0056] The receiving coil resonant module is coupled to the transmitting coil resonant module, and generates an induced current by sensing the alternating magnetic field.

[0057] The following describes the corresponding modules. Figures 2-3 The middle position can be referenced Figure 1 The label description, such as Figure 1 As shown, the wireless charging circuit of this application includes a transmitter 100 and a receiver 200. 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 resonant module 105, a serial communication module 106, a DC input filtering module 107, a transmitter DC / DC+LDO module 108, and a transmitter RGB module 109.

[0058] The receiver 200 includes a receiver control module 201, a receiver coil resonant module 202, a receiver sampling module 203, a receiver wireless communication module 204, a full-bridge rectifier module 205, a filter module 206, a rectifier and filter module 207, a receiver DC / DC+LDO module 208, a receiver 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 power conversion and outputting excitation current based on the control signals output by the control module; a transmitter wireless communication module for information exchange with the receiver wireless communication module; a transmitter sampling module for acquiring electrical parameters such as the transmitter's input voltage, input current, and voltage at the transmitter coil coupling port; and a transmitter coil resonant 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 commands, processing receiving end data, and storing preset battery configuration parameters; a receiving end wireless communication module for transmitting the battery configuration parameters and sampled data from the receiving end control module to the transmitting end wireless communication module to achieve information interaction; 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 resonant module magnetically coupled to the transmitting end coil resonant module for receiving alternating magnetic fields and inducing high-frequency alternating current.

[0061] In actual operation, the receiving end sampling module collects parameters such as receiving end charging current, battery voltage and temperature in real time. The receiving end control module sends the above sampling parameters and the preset battery configuration parameters stored in its internal storage 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 the transmitter's operating parameters, including input voltage, input current, and the coupling port voltage of the transmitter coil resonant module, and transmits the sampled data to the transmitter control module.

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

[0064] After receiving the aforementioned control signals, the high-frequency full-bridge inverter module outputs a forward or reverse excitation current to the transmitting coil resonant module according to the control logic of the first and second control signals, thereby forming an alternating magnetic field with a specific frequency and power. This alternating magnetic field is transmitted to the receiving coil resonant module through spatial magnetic coupling, where the receiving coil induces high-frequency alternating current to provide power 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 suitable excitation signal based on the actual battery type and operating state. The receiver no longer needs a DC / DC buck-boost converter module, simplifying the hardware structure, reducing system heat generation, improving charging efficiency, and enhancing compatibility with different types of battery packs, 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 them 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 resonant module.

[0068] In this embodiment of the application, the transmitter sampling module is electrically connected to the transmitter control module and is used to monitor and provide data feedback on the transmitter's operating status in real time.

[0069] Specifically, the transmitter sampling module is used to collect key electrical parameters of the transmitter, including the transmitter input voltage, input current, and voltage signal at the coupling port of the transmitter coil resonant module. The input voltage and input current reflect the overall power input state 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 through 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 PWM control signals for controlling the high-frequency full-bridge inverter module.

[0070] This data feedback mechanism forms part of the closed-loop regulation of the transmitter control, which helps to dynamically adjust the waveform, frequency and duty cycle of the excitation current, thereby improving the efficiency and stability of wireless power 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 its own stored preset battery configuration parameters to the receiving end wireless communication module.

[0074] The receiving end wireless communication module interacts with the transmitting end wireless communication module to transmit the receiving end parameters and the preset battery configuration parameters to the transmitting end control module.

[0075] In the embodiments of this application, such as 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, which is used to realize the monitoring of the working status of the receiving end, data processing and wireless transmission.

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

[0077] The receiving end sampling module feeds back the collected receiving end parameters to the receiving end control module. The receiving end control module processes the received data and calls the preset battery configuration parameters stored internally. The battery configuration parameters may include information such as target charging voltage, upper current limit, temperature threshold, and charging stage control curve, which are used 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 data to the transmitting end control module. Based on the received information and the input voltage, current, and other parameters provided by the transmitting end sampling module, the transmitting end control module generates a PWM control signal adapted to the current battery type, achieving precise control of the transmitting end high-frequency full-bridge inverter module. Through this communication mechanism, the transmitting end achieves real-time monitoring and remote control of the receiving end's charging status, improving the intelligence of the charging process and the safety of battery charging.

[0079] Furthermore, the transmitter control module searches for the corresponding preset battery configuration data based on 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. 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 resonant 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, which is then conducted to the receiving end coil resonant module to generate high-frequency induced current and voltage.

[0082] In this embodiment, the transmitter control module controls the high-frequency full-bridge inverter module to achieve dynamic adjustment of wireless power transmission. Specifically, the transmitter control module receives receiver parameters and preset battery configuration parameters transmitted from the receiver wireless communication module. The receiver parameters include charging current, battery voltage, and temperature data. The preset battery configuration parameters refer to type feature codes generated based on the voltage and chemical properties of commercially available two-wheeled electric vehicle batteries, such as 36V / 20AH lead-acid batteries, 48V / 20AH lead-acid batteries, 60V / 20AH lead-acid batteries, 70V / 20AH lead-acid batteries, 48V / 20Ah ternary lithium batteries, and 48V / 20AH lithium iron phosphate batteries. The transmitter control module stores preset battery configuration data corresponding to the preset battery configuration parameters and retrieves its own stored preset battery configuration data according to the preset battery configuration parameters.

[0083] Meanwhile, the transmitter control module also receives transmitter parameters collected from the transmitter sampling module, including: input voltage, input current, and voltage at the port of the transmitter coil resonant module.

[0084] The transmitter control module integrates the three types of data receiver 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 and second control signals are PWM signals with adjustable duty cycles and operating frequencies, used to control the on / off states of the MOSFETs inside the inverter module. By adjusting the duty cycle and frequency of the control signals, the transmitter control module can control the high-frequency full-bridge inverter module to output forward or reverse excitation current, thereby adjusting the waveform and amplitude of the high-frequency AC current in the transmitter coil resonant module. Under the action of the excitation current, the transmitter coil resonant module generates a high-frequency alternating magnetic field, which is transmitted to the receiver coil resonant module through spatial magnetic coupling. The receiver coil resonant module induces a high-frequency 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-charge, constant current, constant voltage, trickle charge), thereby meeting the control requirements of various battery types for charging voltage and current, 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, as well as 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;

[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 transistors in the full-bridge circuit to alternately turn on and off according to the first control signal and the second control signal, so as to output 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, which are respectively used to receive the first control signal and the second control signal from the transmitter control module. The power devices of the full-bridge structure are composed of a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET, all of which are N-channel MOSFETs.

[0090] The first driver chip controls the on / off state of the first and second MOSFETs, while the second driver chip controls the on / off state of the third and fourth MOSFETs. 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 cycles and frequencies.

[0091] During operation, the transmitter control module, according to preset control logic, causes the four MOSFETs to turn on and off alternately: when the first control signal is high, the first MOSFET is on and the second MOSFET is off; when the first control signal is low, the first MOSFET is off and the second MOSFET is on; when the second control signal is high, the third MOSFET is on and the fourth MOSFET is off; when the second control signal is low, the third MOSFET is off and the fourth MOSFET is on.

[0092] Through the above 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 generated alternating magnetic field. This inverter structure utilizes the conduction characteristics of N-channel MOSFETs under high-frequency, high-efficiency switching, combined with a dual-drive chip design, to achieve high-speed response and stable control, improving the overall magnetic field control accuracy and charging efficiency of the system.

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

[0094] When the first control signal is high, 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 to turn on and the second MOS to turn off, and outputting a positive excitation current to the transmitter coil resonant module.

[0095] When the first control signal is low, 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 turn off and the second MOS to turn on, and the resonant capacitor to be grounded.

[0096] In this embodiment of the application, the transmitting coil resonant 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 realize wireless power 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 the magnetic field strength and improve energy transfer 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 state of the first MOSFET and the second MOSFET 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 MOSFET is turned on and the second MOSFET is turned off. The high-frequency full-bridge inverter module outputs a positive excitation current to the transmitter coil resonant module, so that the LC resonant circuit starts to establish a high-frequency positive 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 MOSFET is turned off, the second MOSFET is turned on, one end of the resonant capacitor is pulled low to ground potential, the LC circuit completes the energy feedback closed path, and an effective oscillation maintenance condition is formed.

[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 resonant module includes an LC resonant circuit composed of a resonant capacitor and an inductor coil connected in series;

[0102] When the second control signal is high, 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, and outputting a reverse excitation current to the transmitter coil resonant module.

[0103] When the second control signal is low, 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 turn off and the fourth MOS transistor to turn on, and the inductor coil to be grounded.

[0104] In this embodiment, the transmitting coil resonant module consists of an LC resonant circuit formed by a resonant capacitor and an inductor connected in series, used to achieve resonant excitation of a high-frequency magnetic field. This LC circuit responds to the first control signal and the second control signal respectively, generating a forward or reverse excitation current.

[0105] Under the action of the second control signal, the transmitter control module controls the second driver chip to output the corresponding logic level to drive the switching state of the third and fourth MOSFETs 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 MOSFET is turned on and the fourth MOSFET is turned off. The high-frequency full-bridge inverter module outputs a reverse excitation current to the transmitter coil resonant module to drive the LC resonant circuit to form an alternating magnetic field with excitation currents of opposite polarity.

[0106] When the second control signal is low, the HO output of the second driver chip is low and the LO output is high. At this time, the third MOSFET is turned off and the fourth MOSFET is turned on. One end of the inductor coil is pulled to ground potential, completing the current loop of the LC circuit, so that the resonant state can be maintained and the current commutation can be 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 the switching control of the wireless energy output direction.

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

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

[0110] The full-bridge rectifier module is connected to the receiving coil resonant 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, which filters the DC power and outputs the filtered current to the battery load for charging.

[0112] In this embodiment, the receiving end further includes a full-bridge rectifier module and a filter module, 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 resonant module and the transmitting end coil resonant module transmit energy via 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 resonant module outputs a high-frequency alternating current. The receiving end coil resonant module is electrically connected to the full-bridge rectifier module, which converts the high-frequency alternating induced current into DC current. This rectifier module adopts a bridge structure, and the current is unidirectionally controlled by diode conduction direction control, eliminating the alternating current component.

[0113] The filtering module is connected to the full-bridge rectifier module to filter the rectified DC power. The filtering module typically includes parallel filter capacitors and series filter inductors to suppress ripple in the rectified current, improving the stability and smoothness of the output voltage. The filtered, stable DC power is then output to the connected battery load to charge the battery. This structure can provide stable and reliable power to various types of batteries (such as lead-acid and lithium batteries), enhancing the practicality and compatibility of the entire wireless charging system.

[0114] In this embodiment, the rectification and filtering circuit does not require a DC-DC buck-boost converter module, which simplifies the receiver circuit structure, reduces size and power consumption, helps reduce heat generation, and improves the overall efficiency of the charging system.

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

[0116] In this embodiment, the receiving end battery load output is connected to the battery pack on small electric vehicles such as two-wheeled electric vehicles. The transmitting end device communicates with the main control unit of the charging station through a serial communication module, generally using RS485 / CAN bus networking. The AC-DC module in the main control unit of the charging station supplies power to the connected transmitting end.

[0117] The circuit of this application also includes a DC input filter module for filtering the input DC voltage to obtain a cleaner 48V voltage; a transmitter DC / DC+LDO module for stepping down the stable 48VDC voltage to 3.3V; a transmitter RGB module and a receiver RGB module for providing feedback on the operating status of each module through RGB indicator lights; a rectification and filtering module for converting the high-frequency AC power output from the receiver resonant module into low-voltage DC power; and a receiver DC / DC+LDO module for stabilizing the low-voltage DC power output from the rectification and filtering 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 will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to 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 embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0119] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0120] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art 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 instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0122] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0123] If the integrated module / unit is implemented as 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, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed 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 electrical carrier signals and telecommunication signals.

[0124] The implementation of all or part of the processes in the methods of the above embodiments can also be accomplished by a computer program product. When the computer program product is run on a terminal device, the terminal device can implement the steps in the various method embodiments described above.

[0125] The embodiments described above are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A wireless charging circuit, comprising a transmitter and a receiver, 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, a transmitter coil resonant module, a rectifier and filter module, and a receiver DC / DC+LDO module and a DC input filter 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 receiver control module stores preset battery configuration parameters; The receiving end sampling module collects receiving end parameters; The receiving end control module interacts with the transmitting end wireless communication module to transmit the preset battery configuration parameters and the receiving end parameters to the transmitting end control 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 based on the received preset battery configuration parameters, receiver parameters, and transmitter parameters. The high-frequency full-bridge inverter module responds to the first control signal and the second control signal, and outputs a positive or reverse excitation current to the transmitting coil resonant module to generate an alternating magnetic field. The receiving end coil resonant module is coupled to the transmitting end coil resonant module, and generates an induced current by sensing the alternating magnetic field; The transmitter control module stores preset battery configuration data corresponding to the preset battery configuration parameters; The transmitter control module searches for the corresponding preset battery configuration data based on 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. The first control signal and the second control signal have adjustable duty cycles and operating frequencies, which can be adjusted in real time according to the charging stage. The transmitting end control module controls the transmitting end coil resonant 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, which is then conducted to the receiving end coil resonant module to generate high-frequency induced current and voltage. The high-frequency full-bridge inverter module includes a first driver chip and a second driver chip, as well as a full-bridge circuit composed of a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET, wherein the MOSFETs are N-channel MOSFETs. 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 transistors in the full-bridge circuit to alternately turn on and off according to the first control signal and the second control signal, so as to output forward or reverse excitation current; The transmitting coil resonant module includes an LC resonant circuit composed of a resonant capacitor and an inductor coil connected in series. When the first control signal is high, 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 to turn on and the second MOS to turn off, and outputting a positive excitation current to the transmitter coil resonant module. When the first control signal is low, 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 turn off and the second MOS to turn on, and the resonant capacitor to be grounded; The transmitting coil resonant module includes an LC resonant circuit composed of a resonant capacitor and an inductor coil connected in series. When the second control signal is high, 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, and outputting a reverse excitation current to the transmitter coil resonant module. When the second control signal is low, 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 turn off and the fourth MOS transistor to turn on, and the inductor coil to be grounded. The DC input filtering module is used to filter the input DC voltage; The transmitter DC / DC+LDO module is connected to the DC input filter module and is used to step down the filtered DC voltage before supplying it to the transmitter control module. The rectifier and filter module is connected to the receiving coil resonant module and is used to convert the high-frequency AC power output by the receiving coil resonant module into DC power. The receiving end DC / DC+LDO module is connected to the rectifier and filter module, and is used to regulate the DC power output by the rectifier and filter module, and supply it to the receiving end control module or as the reference voltage of the receiving end sampling module.

2. The wireless charging circuit according to claim 1, characterized in that, The transmitter sampling module is electrically connected to the transmitter control module; The transmitter sampling module is used to collect the transmitter parameters and feed them 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 resonant module.

3. The wireless charging circuit according to claim 2, characterized in that, 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 its own stored preset battery configuration parameters to the receiving end wireless communication module. The receiving end wireless communication module interacts with the transmitting end wireless communication module to transmit the receiving end parameters and the preset battery configuration parameters to the transmitting end control module.

4. The wireless charging circuit according to claim 1, characterized in that, The receiving end also includes a full-bridge rectifier module; The full-bridge rectifier module is connected to the receiving coil resonant module to convert the induced current into direct current.

5. The wireless charging circuit according to claim 4, characterized in that, The receiving end also includes a filtering module; The filtering module is connected to the full-bridge rectifier module to filter the DC power and output the filtered current to the battery load for charging.

6. The wireless charging circuit according to claim 1, characterized in that, The transmitter also includes a serial communication module, which is connected to an external charging pile for communication, and the external charging pile supplies power to the transmitter.

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