Multifunctional magnetic resonance wireless charging system

Abstract

The invention discloses a multifunctional magnetic resonance wireless charging system, which comprises a magnetic resonance transmitting end and a magnetic resonance receiving end, and is characterized in that the magnetic resonance transmitting end comprises a high-frequency inversion module, a transmitting master control MCU, a foreign matter detection module and a first acquisition module; the magnetic resonance receiving end comprises a power adaptive output module, a receiving master control MCU and a second acquisition module; the emission master control MCU is configured to dynamically and finely adjust the working frequency of the high-frequency inversion module through the impedance or transmission efficiency acquired by the first acquisition module and the second acquisition module, so that the high-frequency inversion module always tracks the optimal resonance point of the system; and the receiving master control MCU is configured to adjust the PWM signal output to the power adaptive output module through the change of the impedance or the transmission efficiency, and smoothly adjust the output power output to the load. According to the invention, the function of the magnetic resonance charging system is enhanced, and the stability and safety of the charging efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic resonance wireless charging, in particular to a multifunctional magnetic resonance wireless charging system. BACKGROUND

[0002] In recent years, electric vehicles, electric unmanned aerial vehicles, unmanned robots, unmanned delivery vehicles and other equipment have gradually been popularized in people's lives, increasing people's demand for wireless charging of energy storage equipment. With the deepening of research on related charging methods, magnetic resonance wireless charging technology has emerged as the times require due to its advantages such as long charging distance, and can charge electric vehicles, delivery vehicles, port trucks, mine trucks, online taxis, unmanned taxis, heavy-load unmanned aerial vehicles, and public apron fast charging terminals.

[0003] The existing magnetic resonance wireless charging function is relatively single, and has the following defects:

[0004] 1. Poor charging efficiency stability: after the existing technology changes due to factors such as load change, coupling coefficient change, temperature drift, and position change during the charging process, the system cannot adaptively adjust, thereby reducing the charging efficiency of the system and failing to maintain the original charging efficiency.

[0005] 2. Safety: the existing technology does not detect whether there are foreign objects (such as metals and living organisms) during charging, so when foreign objects enter the transmission area, there is a risk of overheating and safety hazards.

[0006] Therefore, the existing technology needs to be improved. SUMMARY

[0007] In view of the shortcomings of the prior art, the purpose of the present application is to provide a multifunctional magnetic resonance wireless charging system to improve the charging efficiency stability and safety of the magnetic resonance charging system.

[0008] To achieve the above purpose, the present application adopts the following technical solutions:

[0009] A multifunctional magnetic resonance wireless charging system includes a magnetic resonance transmitting end and a magnetic resonance receiving end, wherein:

[0010] The magnetic resonance transmitting end includes a city power supply module, a high-frequency inverter module, a transmitting end resonance module, and a transmitting coil connected in sequence, and further includes a transmitting main control MCU connected with the city power supply module and the high-frequency inverter module, and a foreign object detection module, a first acquisition module, and a first communication module connected with the transmitting main control MCU;

[0011] The magnetic resonance receiving end comprises a receiving coil, a receiving end resonance module, a rectification filter module and a power adaptive output module connected in sequence, further comprises a receiving main control MCU connected with the power adaptive output module, and a second acquisition module and a second communication module connected with the receiving main control MCU;

[0012] The foreign matter detection module is configured to detect whether there is metal or living body in the charging area to trigger safety protection.

[0013] The transmitting main control MCU is configured to monitor the impedance or transmission efficiency of the system in real time through the feedback data of the first acquisition module and the second acquisition module, and dynamically fine-tune the working frequency of the high-frequency inverter module according to the impedance or transmission efficiency, so that the working frequency always tracks the optimal resonance point of the system, and the receiving main control MCU is configured to adjust the PWM signal output to the power adaptive output module through the change of the impedance or transmission efficiency, and smoothly adjust the output power output to the load.

[0014] In some embodiments, the mains power supply module comprises an EMC filter module, a rectification module and a PFC interleaved boost module connected in sequence, the PFC interleaved boost module is connected with the high-frequency inverter module, and a PFC switch is connected between the PFC interleaved boost module and the transmitting main control MCU, the PFC switch is configured to close the PFC interleaved boost module when an abnormal situation occurs.

[0015] In some embodiments, the transmitting main control MCU of the magnetic resonance transmitting end is further connected with a vehicle garage detection module, the vehicle garage detection module comprises a three-axis magnetic field sensor, and / or an automatic parking thermal imaging camera, and / or an ultrasonic radar.

[0016] In some embodiments, the transmitting coil is a double transmitting coil, and the receiving coil is a single receiving coil.

[0017] In some embodiments, the high-frequency inverter module comprises a double full-bridge inverter circuit, a first transformer isolation circuit connected with the double full-bridge inverter circuit, and a driving chip connected with the first transformer isolation circuit, the driving chip is connected with the transmitting main control MCU, the input end of the double full-bridge inverter circuit is connected with the PFC interleaved boost module, the output end of the double full-bridge inverter circuit is connected with the double transmitting coil through the transmitting end resonance module, the MOS tube in the double full-bridge inverter circuit adopts a silicon carbide material semiconductor device, and the working frequency is selected between 80 kHz and 150 kHz, and the bridge arm of the double full-bridge inverter circuit is connected with a resonance capacitor and / or a resonance inductor to realize a zero-voltage switching or zero-current switching working state.

[0018] In some embodiments, the magnetic resonance transmitter is provided with a circulating liquid cooling or oil cooling heat dissipation system.

[0019] In some embodiments, the power adaptive output module outputs power to the load from 1kW to 10kW.

[0020] In some embodiments, the magnetic resonance receiver is further connected in parallel with a frequency matching module between the receiver resonant module and the rectifier filter module. The frequency matching module is also connected to the receiver main control MCU. The frequency matching module is configured to make the receiving coil adapt to the frequency of the transmitting coil at the optimal frequency during the charging process.

[0021] In some embodiments, the power adaptive output module includes a full-bridge switching circuit, a second transformer isolation circuit connected to the full-bridge switching circuit, and a PWM signal driving chip connected to the second transformer isolation circuit. The PWM signal driving chip is connected to the receiving main control MCU. The input terminal of the full-bridge switching circuit is connected to the rectifier and filter module, and the output terminal of the full-bridge switching circuit is connected to the load.

[0022] In some embodiments, the first acquisition module includes an ADC sampling circuit, and / or a fuel meter, and / or a first impedance detection circuit, and / or a first voltage and current detection circuit;

[0023] The second acquisition module includes a second voltage and current detection circuit and / or a second impedance detection circuit.

[0024] It should be understood that, within the scope of this invention, the above-mentioned technical features of this invention and the technical features specifically described below (such as embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described in detail here.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. A foreign object detection module is set up. When metal or a living body is detected in the charging area during the charging process, an alarm signal can be sent to the main control MCU to trigger the main control MCU to protect the entire system, such as cutting off the power of the magnetic resonance transmitter to ensure safety.

[0027] 2. During the charging process, the operating frequency can be dynamically fine-tuned according to the real-time changes in impedance or transmission efficiency, so that it always tracks the optimal resonant point of the system, thereby enabling the system to maintain a high charging efficiency, such as generally above 85%, ensuring the stability of the charging efficiency.

[0028] 3. A power adaptive output module is set at the magnetic resonance receiver. Through pulse width modulation (PWM), the output power can be smoothly adjusted without changing the hardware output circuit, so as to meet the seamless switching from 1kW to 10kW and adapt to the power requirements of different charging devices. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the circuit principle of the first embodiment of the multifunctional magnetic resonance wireless charging system of the present invention.

[0031] Figure 2 This is a schematic diagram of the circuit principle of the magnetic resonance transmitter of the present invention.

[0032] Figure 3 This is a schematic diagram of the circuit principle of the magnetic resonance receiver of the present invention.

[0033] Figure 4 This is a schematic diagram of the connection of the dual full-bridge inverter circuit at the magnetic resonance transmitter of the present invention.

[0034] Figure 5 This is a schematic diagram showing the connection between the magnetic resonance transmitter driver chip and the isolation circuit of the first transformer in this invention.

[0035] Figure 6 This is a schematic diagram of the circuit connection of the transmitting main control MCU of the magnetic resonance transmitter of the present invention.

[0036] Figure 7 This is a circuit connection diagram of the frequency matching module of the magnetic resonance receiver of the present invention.

[0037] Figure 8 This is a schematic diagram of the voltage sampling circuit connection of the magnetic resonance receiver of the present invention.

[0038] Figure 9 This is a schematic diagram of the current sampling circuit connection of the magnetic resonance receiver of the present invention.

[0039] Figure label:

[0040] 100-Charging System, 1-Magnetic Resonance Transmitter, 11-Main Power Supply Module, 111-EMC Filter Module, 112-Rectifier Module, 113-PFC Interleaved Boost Module, 114-PFC Switch, 12-High Frequency Inverter Module, 121-Dual Full-Bridge Inverter Circuit, 122-First Transformer Isolation Circuit, 123-Driver Chip, 13-Transmitter Resonant Module, 14-Transmitting Coil, 15-Transmitting Main Control MCU, 16-Foreign Object Detection Module, 17-First Acquisition Module, 171-ADC Sampling Circuit, 172-Fuel Meter, 173-First Impedance Detection Circuit, 174-First Voltage and Current Detection Circuit, 18-First Communication Module, 181-First Bluetooth Module, 182-First LTE-4G Module, 183-First RS485 Module, 19-Vehicle Parking Detection Module, 191-Triaxial Magnetic Field Sensor, 192-Automatic Parking Vehicle thermal imaging camera, 193-ultrasonic radar, 101-first operating power supply, 2-magnetic resonance receiver, 21-receiving coil, 22-receiving resonant module, 23-rectifier and filter module, 24-power adaptive output module, 241-full-bridge switching circuit, 242-second transformer isolation circuit, 243-PWM signal driver chip, 25-receiving main control MCU, 26-second acquisition module, 261-second voltage and current detection circuit, 2611-voltage sampling circuit, 2612-current sampling circuit, 262-second impedance detection circuit, 27-second communication module, 271-second Bluetooth module, 272-second LTE-4G module, 273-second RS485 module, 274-CAN module, 28-frequency pairing module, 29-reverse connection protection circuit, 201-second operating power supply, 3-circulating liquid cooling or oil cooling system. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a quick-release connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0045] refer to Figure 1 This invention provides a multifunctional magnetic resonance wireless charging system 100, including a magnetic resonance transmitter 1 and a magnetic resonance receiver 2. The magnetic resonance transmitter 1 is used to convert the electrical energy input from the mains into a high-frequency alternating magnetic field, while the magnetic resonance receiver 2 induces a strong high-frequency alternating current due to resonance and converts it into direct current for output to achieve wireless charging of the device.

[0046] Specifically, the magnetic resonance transmitter 1 includes a mains power supply module 11, a high-frequency inverter module 12, a transmitter resonant module 13, and a transmitter coil 14 connected in sequence. It also includes a transmitter main control MCU 15 connected to the mains power supply module 11 and the high-frequency inverter module 12, and a foreign object detection module 16, a first acquisition module 17, and a first communication module 18 connected to the transmitter main control MCU 15.

[0047] like Figure 1 As shown, the input terminal of the mains power module 11 is connected to mains power, such as 220VAC. The mains power module 11 filters and rectifies the input mains power before inputting it to the high-frequency inverter module 12. The high-frequency inverter module 12 converts the DC power input from the mains power module 11 into high-frequency AC power, which is then resonated by the transmitter resonant module 13 to generate a high-frequency alternating magnetic field around the transmitter coil 14 for induction reception by the magnetic resonance receiver 2. The transmitter resonant module 13 includes a resonant capacitor, inductor, and other components forming a resonant circuit.

[0048] The foreign object detection module 16 is used to detect whether there is metal or living body in the charging area, and sends the detection result to the transmitting main control MCU 15. The transmitting main control MCU 15 analyzes and judges the detection result. If it is determined that there is metal or living body in the charging area, the safety protection mechanism is triggered, such as cutting off the power supply module 11 to the high frequency inverter module 12, so that the entire magnetic resonance transmitter 1 stops emitting energy.

[0049] In this embodiment, the foreign object detection module 16 can sample in multiple ways, such as:

[0050] A series of small temperature sensors are arranged around or inside the transmitting coil 14. The presence of foreign objects is detected by the signal sensed by the change in the resistance value of the temperature sensors.

[0051] Infrared thermal imaging scanning is used to directly detect foreign objects that generate heat;

[0052] Radar / ultrasound is used to detect whether there are any living beings (such as pets or children) remaining in the charging area.

[0053] In this embodiment, the first acquisition module 17 is used to acquire various input and output parameters of the magnetic resonance transmitter 1, such as voltage, current, charge, impedance, and temperature. The first communication module 18 establishes communication with the magnetic resonance receiver 2 through a wireless communication circuit, or connects to a cloud server, and can also be equipped with a wired communication interface. The transmitter control MCU 15 performs comprehensive control of the circuitry within the entire magnetic resonance transmitter 1. In this embodiment, the magnetic resonance transmitter 1 also includes a first operating power supply 101 connected to the transmitter control MCU 15, which provides operating voltage to the transmitter control MCU 15 and other circuits.

[0054] The magnetic resonance receiver 2 in this embodiment includes a receiving coil 21, a receiving resonant module 22, a rectifier and filter module 23, and a power adaptive output module 24 connected in sequence. It also includes a receiving main control MCU 25 connected to the power adaptive output module 24, and a second acquisition module 26 and a second communication module 27 connected to the receiving main control MCU 25.

[0055] like Figure 1As shown, the receiving coil 21 and the receiving end resonant module 22 combine with the alternating magnetic field near the receiving and transmitting coil 14 to induce alternating current, which is then rectified and filtered by the rectifier and filter module 23 to produce direct current, and then stepped down by the power adaptive output module 24 to output to the load such as a battery for charging. The second acquisition module 26 in this embodiment is used to acquire various input and output parameters of the magnetic resonance receiver 2, such as voltage, current, etc. The second communication module 27 establishes communication with the magnetic resonance transmitter 1 through a wireless communication circuit, or connects to a cloud server, and can also be equipped with a wired communication interface. The receiving master control MCU 25 performs comprehensive control of the circuitry within the entire magnetic resonance receiver 2. In this embodiment, the magnetic resonance receiver 2 also includes a second operating power supply 201 connected to the receiving master control MCU 25, which provides operating voltage to the receiving master control MCU 25 and other circuits.

[0056] In this invention, the transmitting main control MCU 15 in the magnetic resonance transmitter 1 is configured to monitor the impedance or transmission efficiency of the system in real time through the feedback data of the first acquisition module 17 and the second acquisition module 26. The impedance can be acquired through the impedance detection circuit of the magnetic resonance transmitter 1 and the magnetic resonance receiver 2, and the transmission efficiency is calculated through the input and output voltage and current at both ends.

[0057] The transmitting main control MCU 15 also dynamically fine-tunes the operating frequency of the high-frequency inverter module 12 based on impedance or transmission efficiency, ensuring it always tracks the optimal resonant point of the system. Simultaneously, the receiving main control MCU 25 is configured to adjust the PWM signal output to the power adaptive output module 26 based on changes in impedance or transmission efficiency, thus smoothly adjusting the output power to the load. In this way, when the system's input impedance changes due to factors such as variations in the charging device, the magnetic resonance transmitter 1 dynamically adjusts the transmitting power by fine-tuning the operating frequency of the high-frequency inverter module 12, while the magnetic resonance receiver 2 synchronously adjusts its output power. This ensures the entire system always operates at the optimal resonant point, addressing changes in coupling coefficient, load, and component parameter drift, achieving optimal impedance matching. This allows both the magnetic resonance transmitter 1 and the magnetic resonance receiver 2 to operate at their most efficient state, maintaining the system in a high-efficiency charging state. For example, the multifunctional magnetic resonance wireless charging system 100 of this invention maintains a charging efficiency of over 85% through dynamic real-time adjustments to the transmitting frequency and output power, while also seamlessly switching the charging device load from 1kW to 10kW.

[0058] Specifically, such as Figure 2As shown, the AC power supply module 11 of this embodiment includes an EMC filter module 111, a rectifier module 112, and a PFC interleaved boost module 113 connected in sequence. The PFC interleaved boost module 113 is connected to the high-frequency inverter module 12. A PFC switch 114 is connected between the PFC interleaved boost module 113 and the transmitting main control MCU 15. The PFC switch 114 is configured to shut down the PFC interleaved boost module 113 when an abnormal situation occurs.

[0059] The input terminal of the EMC filter module 111 is connected to the mains power supply, and includes interference suppression, surge protection, filtering, and isolation processing of the mains power supply to meet electromagnetic compatibility protection requirements. The input and output terminals of the EMC filter module 111 are connected to the rectifier module 112, which converts the AC mains power into DC power, and then inputs it to the PFC interleaved boost module 113. The PFC interleaved boost module 113 boosts the input DC power and also corrects the power factor, thereby improving the power factor, reducing ineffective energy waste, reducing harmonic pollution to the power grid, stabilizing the bus voltage, and adapting to a wide voltage input range (85-277VAC). In this embodiment, the output voltage of the PFC interleaved boost module 113 is DC 380~410V.

[0060] Meanwhile, in this embodiment of the invention, a PFC switch 114 is connected between the PFC interleaved boost module 113 and the transmitter main control MCU 15. This allows the output of the PFC interleaved boost module 113 to be directly shut off in abnormal situations, such as foreign objects in the charging area or excessively high system operating temperature, thereby cutting off the transmission and ensuring charging safety.

[0061] Furthermore, such as Figure 2 As shown, the transmitting coil 14 is a dual-transmitting coil, and the receiving coil 21 is a single-transmitting coil. That is, in this embodiment of the invention, the transmitting coil 14 of the magnetic resonance transmitting end 1 is a dual-transmitting coil, and the receiving coil 21 of the magnetic resonance receiving end 2 is a single-transmitting coil. This makes the magnetic induction region of the magnetic resonance transmitting end 1 larger than that of the magnetic resonance receiving end 2, so that during charging, the receiving coil 21 does not need to be precisely aligned with the transmitting coil 14, while still maintaining high charging efficiency. In this embodiment, with the transmitting coil 14 stationary, the receiving coil 21 can be efficiently charged within a range of ±15cm offset from the center of the transmitting coil 14. Furthermore, in this embodiment, the charging efficiency remains above 85% even when the height between the transmitting coil 14 and the receiving coil 21 varies within the range of 10 to 40cm during charging.

[0062] Combination Figure 2 , Figure 5 and Figure 6In this embodiment of the invention, the high-frequency inverter module 12 includes a dual full-bridge inverter circuit 121, a first transformer isolation circuit 122 connected to the dual full-bridge inverter circuit 121, and a driver chip 123 connected to the first transformer isolation circuit 122. The driver chip 123 is connected to the transmitting main control MCU 15. The input terminal of the dual full-bridge inverter circuit 121 is connected to the PFC interleaved boost module 113. The output terminal of the dual full-bridge inverter circuit 121 is connected to the dual transmitting coil 14 through the transmitting resonant module 13. The MOS transistors in the dual full-bridge inverter circuit 121 are silicon carbide semiconductor devices, and the operating frequency is selected between 80kHz and 150kHz. At the same time, the bridge arms of the dual full-bridge inverter circuit 121 are connected to resonant capacitors and / or resonant inductors to achieve zero-voltage switching or zero-current switching operation.

[0063] In this embodiment, the dual full-bridge inverter circuit 121 of the high-frequency inverter module 12 converts the high-voltage DC provided by the PFC interleaved boost module 113 into high-frequency AC and outputs it to the transmitter resonant module 13. The dual full-bridge inverter circuit 121 consists of two full-bridge inverter circuits and is used to drive the two transmitting coils 14, such as... Figure 4 As shown, MOSFETs Q1, Q2, Q3, and Q4 form a first full-bridge inverter circuit, used to drive the transmitting coil 1 after connecting to the transmitting resonant module 13. MOSFETs Q5, Q6, Q7, and Q8 form a second full-bridge inverter circuit, used to drive the transmitting coil 2 after connecting to the transmitting resonant module 13. The control signal for the first full-bridge inverter circuit is provided by P1, and the control signal for the second full-bridge inverter circuit is provided by P2. In this embodiment, MOSFETs Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 are all silicon carbide semiconductor devices, rather than traditional silicon-based semiconductors. Silicon carbide MOSFETs can withstand high voltage and high current, have fast switching speed, excellent high-temperature characteristics, and excellent high-frequency characteristics. They have lower on-resistance, faster switching speed, and higher temperature resistance, which can significantly improve the efficiency and power density of the inverter module. Meanwhile, its small size and light weight reduce the size of the magnetic resonance transmitter circuit. In this embodiment, the operating frequencies of the MOS transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 are selected between 80kHz and 150kHz, which can be compatible with the wireless charging standard for electric vehicles and balance switching losses and coil size.

[0064] like Figure 4 As shown, the bridge arms of the dual full-bridge inverter circuit 121 are connected to resonant capacitors, which enables the MOSFETs Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 to achieve zero-voltage switching or zero-current switching operation, further reducing the losses during the MOSFET's turn-on and turn-off processes.

[0065] likeFigure 5 As shown, in the high-frequency inverter module 12, which is one of the sets of transmitting coils 14, one of the transformers T1 of the first transformer isolation circuit 122 is connected between the driver chip 123 and the first full-bridge inverter circuit in the dual full-bridge inverter circuit 121. In this circuit, there are two driver chips 123, including U1 and U2. U1 and U2 are model UCC27324DR. The input terminals of U1 and U2 are both connected to the transmitting master control MCU 15. The transmitting master control MCU 15 outputs PWM signals to U1 and U2. After being driven by U1 and U2, the signals are output to T1, and then input to the first full-bridge inverter circuit through P1. T1 provides electrical isolation and protects the transmitting master control MCU 15. The driver chip and transformer isolation circuit of the other set of transmitting coils 14 in the high-frequency inverter module 12 of this embodiment are not shown.

[0066] Preferably, such as Figure 6 As shown, the transmitting main control MCU 15 in this embodiment of the invention uses the N32A455REL7 chip. The transmitting main control MCU 15 outputs four PWM signals: PWM_U1-INA, PWM_U2-INB, PWM_U3-INA, and PWM_U4-INB. PWM_U3-INA and PWM_U4-INB control the first full-bridge inverter circuit in the dual full-bridge inverter circuit 121, while PWM_U1-INA and PWM_U2-INB control the second full-bridge inverter circuit in the dual full-bridge inverter circuit 121. It can be understood that the receiving main control MCU 25 in this embodiment can also use the N32A455REL7 chip.

[0067] In this embodiment, the magnetic resonance receiver 2 is directly installed at the vehicle end or can be detachably connected to the vehicle end.

[0068] Preferably, such as Figure 2 As shown, in this embodiment of the invention, the transmitting main control MCU 15 of the magnetic resonance transmitter 1 is also connected to a vehicle parking detection module 19. The vehicle parking detection module 19 includes a three-axis magnetic field sensor 191, and / or an automatic parking thermal imaging camera 192, and / or an ultrasonic radar 193. The three-axis magnetic field sensor 191, and / or the automatic parking thermal imaging camera 192, and / or the ultrasonic radar 193 can detect whether a vehicle has entered the parking space. After entering the parking space, the vehicle parking detection module 19 sends the detected signal to the transmitting main control MCU 15. Then, the transmitting main control MCU 15 analyzes and judges the signal before proceeding to the next operation instruction, such as performing a handshake communication with the magnetic resonance receiver 2 at the vehicle end.

[0069] Furthermore, such as Figure 2As shown, the magnetic resonance transmitter 1 of this embodiment is equipped with a circulating liquid cooling or oil cooling heat dissipation system 3. The magnetic resonance transmitter 1 of this invention has high power and generates a lot of heat. In this embodiment, the transmitting coil and power devices at the end of the magnetic resonance transmitter 1 are combined with a cooling plate. The coolant or oil is circulated by a pump to carry the heat to an external heat sink for heat dissipation. This can ensure that the charging system 100 of this invention can operate at full load for a long time and improve the life of the devices.

[0070] like Figure 3 As shown, the power adaptive output module 24 of this embodiment includes a full-bridge switching circuit 241, a second transformer isolation circuit 242 connected to the full-bridge switching circuit 241, and a PWM signal driving chip 243 connected to the second transformer isolation circuit 242. The PWM signal driving chip 243 is connected to the receiving main control MCU 25. The input terminal of the full-bridge switching circuit 241 is connected to the rectifier and filter module 23, and the output terminal of the full-bridge switching circuit 241 is connected to the load.

[0071] The rectifier and filter module 23 converts the AC input from the receiver resonant module 22 into DC, and then inputs it to the full-bridge switching circuit 241 for DC-DC voltage adjustment to match the charging voltage of the load (battery).

[0072] The voltage and current parameters of the load can be acquired by the second acquisition module 26 of the magnetic resonance receiver 2, and then fed back to the receiving main control MCU 25. The receiving main control MCU 25 adjusts the duty cycle of the PWM signal output to the PWM signal driver chip 243 according to the acquired parameters, thereby adjusting the voltage output to the load by the full-bridge switching circuit 241. The second transformer isolation circuit 242 isolates the strong and weak currents to protect the receiving main control MCU 25. In this embodiment, the full-bridge switching circuit 241, the second transformer isolation circuit 242, and the PWM signal driver chip 243 of the magnetic resonance receiver 2 can adopt a similar circuit structure to that in the high-frequency inverter module 12 of the magnetic resonance transmitter 1, and will not be shown here.

[0073] Preferably, the power adaptive output module 24 of this embodiment outputs a power of 1kW to 10kW to the load, which can adapt to charging devices with different charging needs.

[0074] Preferably, a reverse connection protection circuit 29 is also connected between the load of the magnetic resonance receiver 2 and the receiving main control MCU 25. This can prevent the connection line between the magnetic resonance receiver 2 and the charging device from being reversed during charging, protect the core components from damage by reverse voltage / current, and prevent short circuits or excessive current, thereby improving product reliability and user experience.

[0075] Furthermore, such as Figure 3 and Figure 7As shown, in this embodiment of the invention, the magnetic resonance receiver 2 is further connected in parallel with a frequency matching module 28 between the receiver resonant module 22 and the rectifier filter module 23. The frequency matching module 28 is also connected to the receiver main control MCU 25. The frequency matching module 28 is configured to make the receiving coil 21 match the frequency of the transmitting coil 14 at the optimal frequency during the charging process.

[0076] The frequency matching module 28 brings the resonant frequencies of the transmitter and receiver closer together, thereby improving charging efficiency. During the adjustment of the operating frequency of the high-frequency inverter module 12 of the magnetic resonance transmitter 1, the magnetic resonance receiver 2 monitors the output power to the load. When the output power reaches the preset power, the magnetic resonance receiver 2 locks the resonant frequency of the receiver resonant module 22 through the frequency matching module 28. Simultaneously, the magnetic resonance receiver 2 sends this locked frequency signal to the magnetic resonance transmitter 1, and the operating frequency of the high-frequency inverter module 12 of the magnetic resonance transmitter 1 stops adjusting. In this way, the frequency matching module 28 achieves optimal resonant frequency matching between the receiving coil 21 and the transmitting coil 14. Figure 7 As shown, the frequency pairing module 28 is equipped with a driver chip U1, which is connected to the receiving MCU 25. Figure 7 The C-LLC terminal in the intermediate frequency pairing module 28 is connected between the receiver resonant module 22 and the rectifier filter module 23, where INA1 and OUTA1 are both test points.

[0077] Please continue to refer to this. Figure 2 In this embodiment, the first acquisition module 17 includes an ADC sampling circuit 171, and / or a power meter 172, and / or a first impedance detection circuit 173, and / or a first voltage and current detection circuit 174.

[0078] The ADC sampling circuit 171 can sample the temperature, power, etc. of the magnetic resonance transmitter 1 for reference processing by the transmitter main control MCU 15.

[0079] The power meter 172 can collect input voltage, input current and effective power.

[0080] The first impedance detection circuit 173 can acquire the equivalent impedance of the magnetic resonance transmitter 1.

[0081] The first voltage and current detection circuit 174 can also collect the input voltage and current, and the output voltage and current of the magnetic resonance transmitter 1. Then, the transmitter main control MCU 15 can calculate the success rate based on the voltage and current information collected by the first voltage and current detection circuit 174.

[0082] Preferably, such as Figure 2As shown, the first communication module 18 of the magnetic resonance transmitter 1 in this embodiment includes a first Bluetooth module 181, a first LTE-4G module 182, and a first RS485 module 183.

[0083] The first Bluetooth module 181 is used to communicate with the magnetic resonance receiver 2 via Bluetooth to complete identity authentication and device pairing identification, charging control and real-time feedback information, system status and fault diagnosis information, user interaction and value-added service information, etc.

[0084] The first LTE-4G module 182 wirelessly transmits relevant data to the server, such as: device identification, network status information, voltage, current, effective power, current temperature, foreign object detection abnormal status, software upgrade, system alarm, vehicle location, device operating status, and other related information.

[0085] The first RS485 module 183 is used for communication expansion to meet other needs of the vehicle.

[0086] Please continue to refer to this. Figure 2 The second acquisition module 26 includes a second voltage and current detection circuit 261 and / or a second impedance detection circuit 262.

[0087] The second impedance detection circuit 262 can collect the input equivalent impedance of the magnetic resonance receiver 2, such as the impedance after connecting the battery load, so that the magnetic resonance receiver 2 can adjust the output power in a timely manner.

[0088] The second voltage and current detection circuit 261 can collect the input voltage and current, and the output voltage and current of the magnetic resonance receiver 1. Then, the main control MCU 25 can convert the voltage and current information collected by the second voltage and current detection circuit 174 into charging output power and other information.

[0089] like Figure 8 As shown, the voltage sampling circuit 2611 in the second voltage and current detection circuit 261 can sample the output voltage, i.e., the voltage across the battery terminals, during the charging process. Figure 9 As shown, the current sampling circuit 2612 in the second voltage and current detection circuit 261 can sample the output current, i.e. the charging current of the battery, during the charging process.

[0090] Preferably, such as Figure 3 As shown, the second communication module 27 of the magnetic resonance receiver 2 in this embodiment includes a second Bluetooth module 271, a second LTE-4G module 272, a second RS485 module 273, and a CAN module 274.

[0091] The second Bluetooth module 271 is used to communicate with the magnetic resonance transmitter 1 via Bluetooth to complete identity authentication and device pairing identification, charging control and real-time feedback information, etc.

[0092] The second LTE-4G module 272 reports relevant data to the server via wireless transmission.

[0093] The second RS485 module 273 is also used for communication extensions.

[0094] The CAN module 274 is used to interact with the vehicle's BMS battery management system via CAN (FD). This includes information such as vehicle battery information, total voltage, total current, SOC, SOH, individual cell voltage, battery pack temperature, charging power, fault warnings, and fault reporting.

[0095] The above description is merely an example to clearly illustrate the present invention and is not intended to limit the patent scope of the present invention. It is impossible to exhaustively list all embodiments here. All equivalent structural transformations made using the content of the technical solution of the present invention under the concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A multifunctional magnetic resonance wireless charging system, comprising a magnetic resonance transmitter and a magnetic resonance receiver, characterized in that: The magnetic resonance transmitter includes a mains power supply module, a high-frequency inverter module, a transmitter resonant module, and a transmitter coil connected in sequence. It also includes a transmitter main control MCU connected to the mains power supply module and the high-frequency inverter module, as well as a foreign object detection module, a first acquisition module, and a first communication module connected to the transmitter main control MCU. The magnetic resonance receiver includes a receiving coil, a receiving resonant module, a rectifier and filter module, and a power adaptive output module connected in sequence. It also includes a receiving main control MCU connected to the power adaptive output module, and a second acquisition module and a second communication module connected to the receiving main control MCU. The foreign object detection module is configured to detect whether there is metal or a living object in the charging area to trigger safety protection. The transmitting master control MCU is configured to monitor the system's impedance or transmission efficiency in real time through feedback data from the first acquisition module and the second acquisition module, and dynamically fine-tune the operating frequency of the high-frequency inverter module according to the impedance or transmission efficiency so that it always tracks the system's optimal resonance point. The receiving master control MCU is configured to adjust the PWM signal output to the power adaptive output module through changes in the impedance or transmission efficiency, thereby smoothly adjusting the output power output to the load.

2. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The mains power supply module includes an EMC filter module, a rectifier module, and a PFC interleaved boost module connected in sequence. The PFC interleaved boost module is connected to the high-frequency inverter module. A PFC switch is connected between the PFC interleaved boost module and the transmitter main control MCU. The PFC switch is configured to shut down the PFC interleaved boost module in case of an abnormal situation.

3. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The main control MCU of the magnetic resonance transmitter is also connected to a vehicle parking detection module, which includes a three-axis magnetic field sensor, and / or an automatic parking thermal imaging camera, and / or an ultrasonic radar.

4. The multifunctional magnetic resonance wireless charging system according to claim 2, characterized in that, The transmitting coil is a dual transmitting coil, and the receiving coil is a single receiving coil.

5. The multifunctional magnetic resonance wireless charging system according to claim 4, characterized in that, The high-frequency inverter module includes a dual full-bridge inverter circuit, a first transformer isolation circuit connected to the dual full-bridge inverter circuit, and a driver chip connected to the first transformer isolation circuit. The driver chip is connected to the transmitting main control MCU. The input terminal of the dual full-bridge inverter circuit is connected to the PFC interleaved boost module. The output terminal of the dual full-bridge inverter circuit is connected to the dual transmitting coils through the transmitting resonant module. The MOS transistors in the dual full-bridge inverter circuit are silicon carbide semiconductor devices with an operating frequency between 80kHz and 150kHz. The bridge arms of the dual full-bridge inverter circuit are connected to resonant capacitors and / or resonant inductors to achieve zero-voltage switching or zero-current switching operation.

6. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The magnetic resonance transmitter is equipped with a circulating liquid cooling or oil cooling heat dissipation system.

7. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The power adaptive output module outputs power to the load ranging from 1kW to 10kW.

8. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The magnetic resonance receiver also has a frequency matching module connected in parallel between the receiver resonant module and the rectifier filter module. The frequency matching module is also connected to the receiver main control MCU. The frequency matching module is configured to make the receiving coil match the frequency of the transmitting coil at the optimal frequency during the charging process.

9. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The power adaptive output module includes a full-bridge switching circuit, a second transformer isolation circuit connected to the full-bridge switching circuit, and a PWM signal driving chip connected to the second transformer isolation circuit. The PWM signal driving chip is connected to the receiving main control MCU. The input terminal of the full-bridge switching circuit is connected to the rectifier and filter module, and the output terminal of the full-bridge switching circuit is connected to the load.

10. The multifunctional magnetic resonance wireless charging system according to claim 1, characterized in that, The first acquisition module includes an ADC sampling circuit, and / or a fuel meter, and / or a first impedance detection circuit, and / or a first voltage and current detection circuit; The second acquisition module includes a second voltage and current detection circuit and / or a second impedance detection circuit.

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