Charging matching circuit of wireless power bank

Abstract

The utility model provides a charging matching circuit of a wireless power bank, and relates to the technical field of charging of wireless power banks. According to the utility model, the NFC matching module detects the NFC label data of the charging device, identifies the identity data of the NFC label, matches the identified NFC identity data with the identity data stored in the NFC matching module, and sends the matching result to the control module, when the identity data is matched, the control module controls the charging switch module to be switched on, and the charging switch module is switched off. The wireless transmitting module is turned on, the voltage in the battery module is boosted and then transmitted to the wireless transmitting module, the wireless transmitting module converts the boosted direct current into an alternating magnetic field and starts to charge the charging equipment, and the control module displays the working state of the power bank through the indication module.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless power bank charging, in particular to a wireless power bank charging matching circuit. Background Technique

[0002] The wireless power bank eliminates the limitation of using a charging cable in the traditional charging method. Users do not need to carry an additional USB charging cable. They only need to place the device on the power bank to start charging. This seamless charging experience improves the user's convenience and comfort. The existing wireless power bank is an open charging device that can charge any wireless charging device. Therefore, in public places or without the knowledge of the power bank owner, it will be randomly used by others to charge, and the drained wireless power bank will cause inconvenience to the power bank owner.

[0003] Based on the above problems, there is an urgent need in the field for a wireless power bank charging matching circuit that can perform wireless charging only after matching with the charging device of the wireless power bank user, and the matching process is simple and fast. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a wireless power bank charging matching circuit to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A wireless power bank charging matching circuit includes:

[0007] An NFC matching module, the NFC matching module includes an NFC detection module and an NFC identification module. The NFC detection module and the NFC identification module are electrically connected, and are used to generate an alternating magnetic field to detect the NFC tag of the charging device, receive the magnetic field signal sent from the NFC tag, and convert it into the identity data of the NFC tag and send it to the NFC identification module. The NFC identification module is electrically connected to the control module, and is used to match the received identity data of the NFC tag with the identity data stored in the NFC identification module, and send the matching result to the control module;

[0008] A control module, the control module is used to receive the matching result sent by the NFC identification module, and send a control instruction to the charging switch module according to the matching result;

[0009] A battery module, the battery module is electrically connected to the NFC matching module, the control module and the boost module, and is used to provide a control power supply and a wireless charging power supply;

[0010] An indication module, the indication module is electrically connected to the control module, and is used to display the working state of the power bank under the control instruction of the control module;

[0011] A boost module, which is electrically connected to the battery module and is used to convert the voltage value stored in the battery module into the voltage value required for wireless discharging.

[0012] A charging switch module, which is electrically connected to the control module and the wireless transmission module and is used to switch on and off the circuit connection between the boost module and the wireless transmission module under the control instruction of the control module.

[0013] A wireless transmission module, which is used to convert the boosted direct current into an alternating magnetic field for energy transfer.

[0014] In this embodiment, the NFC matching module includes an NFC detection module and an NFC identification module. The NFC detection module includes an NFC controller U5, resistors R6, R7, R8, R9, capacitors C7, C8, C9, C10, C11, C12, inductors L2, L3, an antenna L4, a ground terminal GND5, and a ground terminal GND6. The NFC controller U5 includes a GND input terminal, a VCC input terminal, an RST output terminal, a MISO communication terminal, a MOSI communication terminal, an SCK input terminal, an NSS input terminal, an RX input terminal, a VMID output terminal, a TX1 output terminal, a TVSS output terminal, and a TX2 output terminal. The RX input terminal is electrically connected to one end of the resistor R6 and one end of the capacitor C6. The other end of the resistor R6 is electrically connected to the VMID output terminal and one end of the capacitor C7. The other end of the capacitor C7 is electrically connected to the ground terminal GND5. The other end of the capacitor C6 is electrically connected to one end of the resistor R7. The other end of the resistor R7 is electrically connected to one end of the capacitor C7 and one end of the capacitor C8. The TX1 output terminal is connected in series with the inductor L3, the capacitor C7, the resistor R8, and the AC1 terminal of the antenna L4. The TX2 output terminal is connected in series with the inductor L2, the capacitor C10, the resistor R9, and the AC2 terminal of the antenna L4. The VMID output terminal is electrically connected to the ground terminal GND6, the other end of the capacitor C8, one end of the capacitor C9, one end of the capacitor C11, one end of the capacitor C12, and the AC3 terminal of the antenna L4. The other end of the capacitor C9 is electrically connected to one end of the capacitor C10. The other end of the capacitor C11 is electrically connected to one end of the resistor R8. The other end of the capacitor C12 is electrically connected to one end of the resistor R9 and one end of the capacitor C10. The NFC identification module is an NFC identifier U6, including IO12 input terminals, IO13 input terminals, IO14 input terminals, IO15 input terminals, IO16 input terminals, an IO0 output terminal, a VCC input terminal, and a GND input terminal. The IO12 input terminal, the IO13 input terminal, the IO14 input terminal, the IO15 input terminal, and the IO16 input terminal are respectively electrically connected to the RST output terminal, the MISO communication terminal, the MOSI communication terminal, the SCK input terminal, and the NSS input terminal of the NFC detection module.

[0015] In this embodiment, the control module includes a controller U1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a crystal oscillator Y1, and a ground terminal GND1. The controller U1 includes a PC14 input terminal, a PC15 input terminal, a PA1 output terminal, a PA2 output terminal, a PA3 output terminal, a PA4 output terminal, a PA5 output terminal, a PA6 input terminal, a PA7 input terminal, a VABT input terminal, and a VDD input terminal. The PA7 input terminal is electrically connected to the IO0 output terminal of the NFC identification module. The crystal oscillator Y1 is connected in series between the PC14 input terminal and the PC15 input terminal. The PC14 input terminal is electrically connected to one end of the capacitor C2. The PC15 input terminal is electrically connected to one end of the capacitor C1. The other end of the capacitor C2 is electrically connected to the other end of the capacitor C1 and the ground terminal GND1. The capacitor C3 is connected in series between the VABT input terminal and the VDD input terminal. The battery module includes a positive input terminal and a negative input terminal. The indication module includes LED lights D1, D5LED lights D2, LED lights D3, LED lights D4, and resistors R1, R4, and R5. The anodes of the LED lights D1, D5LED lights D2, LED lights D3, and LED lights D4 are electrically connected to the PA1 output terminal, the PA2 output terminal, the PA3 output terminal, and the PA4 output terminal of the controller respectively. The cathodes of the LED lights D1, D5LED lights D2, LED lights D3, and LED lights D4 are electrically connected to one end of the resistor R1. The other end of the resistor R1 is electrically connected to the ground terminal GND1. One end of the resistor R5 and one end of the resistor R4 are electrically connected to the PA6 input terminal of the control module.

[0016] In this embodiment, the boost module includes a boost converter U2, a resistor R2, a resistor R3, an inductor L1, a capacitor C4, a ground terminal GND2, and a ground terminal GND3. The boost converter U2 includes a VIN input terminal, an EN enable terminal, a GND ground terminal, a SW input terminal, and an FB output terminal. The VIN input terminal, the EN enable terminal, one end of the capacitor C4, one end of the inductor L1, the other end of the resistor R5, the positive input terminal of the battery module, the VDD input terminal of the control module, the VCC input terminal of the NFC detection module, and the VCC input terminal of the NFC identification module are electrically connected. The other end of the capacitor C4 is electrically connected to the ground terminal GND2. The SW input terminal is electrically connected to the other end of the inductor L1 and one end of the resistor R2. The FB output terminal is electrically connected to the other end of the resistor R2 and one end of the resistor R3. The other end of the resistor R3 is electrically connected to the ground terminal GND3. The charging switch module includes a discharge switch U3 and a ground terminal GND4. The discharge switch U4 includes a VIN input terminal, a GND output terminal, an L1 input terminal, an L2 output terminal, an L3 input terminal, and an L4 output terminal. The VIN input terminal is electrically connected to the PA6 input terminal of the control module. The GND output terminal is connected to the ground terminal GND4. The L1 input terminal is electrically connected to the other end of the inductor L1 and the other end of the resistor R2. The L3 input terminal is electrically connected to the negative input terminal of the battery module, the GND ground terminal of the boost module, the GND input terminal of the NFC detection module, the GND input terminal of the NFC identification module, the VABT input terminal of the control module, and the other end of the resistor R4. The wireless transmission module includes a transmission module U4, a coil, and a capacitor C5. The transmission module U4 includes a VIN input terminal, a GND input terminal, an LX1 output terminal, and an LX2 output terminal. The coil includes two connection terminals AC1 and AC2. The VIN input terminal is electrically connected to the L2 output terminal of the charging switch module. The GND input terminal is electrically connected to the L4 output terminal of the charging switch module. The LX1 output terminal is electrically connected to the other end of the capacitor C5. The other end of the capacitor C5 is electrically connected to the AC1 terminal of the coil. The LX2 output terminal is electrically connected to the AC2 terminal of the coil.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] The utility model detects the NFC tag data of a charging device through an NFC matching module, identifies the identity data of the NFC tag, matches the identified NFC identity data with the identity data stored in the NFC matching module, and sends the matching result to the control module. When the identity data matches, the control module turns on the charging switch module, turns on the wireless transmission module, the voltage in the battery module is boosted and then reaches the wireless transmission module. The wireless transmission module converts the boosted direct current into an alternating magnetic field and starts to charge the charging device. The control module displays the working state of the power bank through the indication module. By utilizing the characteristics of fast and convenient data transmission of NFC, the matching of the charging device is completed and the charging device is charged, effectively preventing the occurrence of unauthorized use of the wireless power bank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the system of the utility model;

[0020] Figure 2 is a schematic circuit diagram of the utility model.

[0021] In the figure: 10 NFC matching module, 11 NFC detection module, 12 NFC identification module, 20 control module, 30 battery module, 40 indication module, 50 boosting module, 60 charging switch module, 70 wireless transmission module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0023] Embodiment:

[0024] Please refer to Figure 1-2 , the utility model provides a technical solution:

[0025] A wireless power bank charging matching circuit includes an NFC matching module 10, a control module 20, a battery module 30, an indication module 40, a boosting module 50, a charging switch module 60 and a wireless transmission module 70, wherein;

[0026] NFC matching module 10, the NFC matching module 10 includes an NFC detection module 11 and an NFC identification module 12. The NFC detection module 11 and the NFC identification module 12 are electrically connected. It is used to generate an alternating magnetic field to detect the NFC tag of the charging device, receive the magnetic field signal sent from the NFC tag, and convert it into the identity data of the NFC tag and send it to the NFC identification module 12. The NFC identification module 12 is electrically connected to the control module 20, and is used to match the received identity data of the identified NFC tag with the identity data stored in the NFC identification module 12, and send the matching result to the control module 20.

[0027] Further, the NFC matching module 10 includes an NFC detection module 11 and an NFC identification module 12. The NFC detection module 11 includes an NFC controller U5, resistors R6, R7, R8, R9, capacitors C7, C8, C9, C10, C11, C12, inductors L2, L3, an antenna L4, a ground terminal GND5, and a ground terminal GND6. The NFC controller U5 uses an NFC induction card reader module of model MFRC522. The RC522 NFC induction card reader module is a card reader module based on radio frequency identification technology, including components such as an antenna, a transceiver, and a modem. It can achieve wireless identification and data reading and writing of nearby electronic tags through a radio frequency antenna. At the same time, this module provides an SPI communication interface for communicating with a microcontroller and sending the read NFC tag data to the microcontroller, including a GND input terminal, a VCC input terminal, an RST output terminal, a MISO communication terminal, a MOSI communication terminal, an SCK input terminal, an NSS input terminal, an RX input terminal, a VMID output terminal, a TX1 output terminal, a TVSS output terminal, and a TX2 output terminal. The RX input terminal is electrically connected to one end of the resistor R6 and one end of the capacitor C6. The other end of the resistor R6 is electrically connected to the VMID output terminal and one end of the capacitor C7. The other end of the capacitor C7 is electrically connected to the ground terminal GND5. The other end of the capacitor C6 is electrically connected to one end of the resistor R7. The other end of the resistor R7 is electrically connected to one end of the capacitor C7 and one end of the capacitor C8. The TX1 output terminal is connected in series with the inductor L3, the capacitor C7, the resistor R8, and the AC1 terminal of the antenna L4. The TX2 output terminal is connected in series with the inductor L2, the capacitor C10, the resistor R9, and the AC2 terminal of the antenna L4. The VMID output terminal is electrically connected to the ground terminal GND6, the other end of the capacitor C8, one end of the capacitor C9, one end of the capacitor C11, one end of the capacitor C12, and the AC3 terminal of the antenna L4. The other end of the capacitor C9 is electrically connected to one end of the capacitor C10. The other end of the capacitor C11 is electrically connected to one end of the resistor R8. The other end of the capacitor C12 is electrically connected to one end of the resistor R9 and one end of the capacitor C10. The NFC identification module 12 is an NFC identifier U6. The NFC identifier U6 uses an NFC identification module of model ESP-12S, which has SPI communication and a data memory. It can communicate with the NFC detection module 11 through SPI and store the identity information of the NFC tag for matching with the NFC tag, including an IO12 input terminal, an IO13 input terminal, an IO14 input terminal, an IO15 input terminal, an IO16 input terminal, an IO0 output terminal, a VCC input terminal, and a GND input terminal. The IO12 input terminal, IO13 input terminal, IO14 input terminal, IO15 input terminal, and IO16 input terminal are respectively electrically connected to the RST output terminal, MISO communication terminal, MOSI communication terminal, SCK input terminal, and NSS input terminal of the NFC detection module 11.

[0028] Since the commonly used charging device is a mobile phone, using the NFC function of the mobile phone, when the mobile phone is close to the wireless power bank, the NFC detection module 11 detects the NFC tag in the charging device, identifies the identity data information in the tag, and communicates with the NFC identification module 12 through the SPI communication composed of the RST output terminal, MISO communication terminal, MOSI communication terminal, SCK input terminal and NSS input terminal, and sends the identity data information in the identified tag to the NFC identification module 12, and performs matching with the identity information stored in the NFC identification module 12, and sends the matching result to the control module 20 through the IO0 output terminal. When the identity data information is matched, a high-level signal is sent, otherwise a low-level signal is sent.

[0029] The control module 20 is used to receive the matching result sent by the NFC identification module 12 and send a control instruction to the charging switch module 60 according to the matching result.

[0030] The battery module 30 is electrically connected to the NFC matching module 10, the control module 20 and the boost module 50, and is used to provide a control power supply and a wireless charging power supply.

[0031] The indication module 40 is electrically connected to the control module 20 and is used to display the working state of the power bank under the control instruction of the control module 20.

[0032] Further, the control module 20 includes a controller U1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a crystal oscillator Y1 and a ground terminal GND1. The controller U1 uses a controller of model STM32F103C8T6, including a PC14 input terminal, a PC15 input terminal, a PA1 output terminal, a PA2 output terminal, a PA3 output terminal, a PA4 output terminal, a PA5 output terminal, a PA6 input terminal, a PA7 input terminal, a VABT input terminal and a VDD input terminal. The PA7 input terminal is electrically connected to the IO0 output terminal of the NFC identification module 12. The crystal oscillator Y1 is connected in series between the PC14 input terminal and the PC15 input terminal. The PC14 input terminal is electrically connected to one end of the capacitor C2. The PC15 input terminal is electrically connected to one end of the capacitor C1. The other end of the capacitor C2 is electrically connected to the other end of the capacitor C1 and the ground terminal GND1. The capacitor C3 is connected in series between the VABT input terminal and the VDD input terminal. The capacitor C1, the capacitor C2 and the crystal oscillator Y1 form a crystal oscillator circuit for providing an accurate clock signal. The battery module 30 uses a polymer lithium battery of model HLCCSM, including an input positive terminal and an input negative terminal.

[0033] The indication module 40 includes LED lights D1, D5, LED light D2, LED light D3, LED light D4, and resistors R1, R4, and R5. All the LED lights use the LED of model ZTSMDLED0402. The anodes of LED lights D1, D5, LED light D2, LED light D3, and LED light D4 are electrically connected to the PA1 output terminal, PA2 output terminal, PA3 output terminal, and PA4 output terminal of the controller respectively. The cathodes of LED lights D1, D5, LED light D2, LED light D3, and LED light D4 are electrically connected to one end of resistor R1. The other end of resistor R1 is electrically connected to the ground terminal GND1. One end of resistor R5 and one end of resistor R4 are electrically connected to the PA6 input terminal of the control module 20.

[0034] When the PA7 input terminal of the control module 20 receives the high-level instruction sent by the IO0 output terminal of the NFC recognition module 12, it outputs a high-level control instruction to the charging switch module 60 through the PA5 output terminal. The PA6 input terminal detects the voltage data of the battery module 30 in real time through the voltage detection circuit composed of resistor R5 and R6, and displays the detected voltage data of the battery module 30 and the result of the control module 20 matching the NFC tag through the indication module 40.

[0035] The boost module 50 is electrically connected to the battery module 30 and is used to convert the voltage value stored in the battery module 30 into the voltage value required for wireless discharge.

[0036] The charging switch module 60 is electrically connected to the control module 20 and the wireless transmission module 70, and is used to turn on and off the circuit connection between the boost module 50 and the wireless transmission module 70 under the control instruction of the control module 20.

[0037] The wireless transmission module 70 is used to convert the boosted direct current into an alternating magnetic field for energy transfer.

[0038] Further, the boost module 50 uses the booster U2 which is a small boost DC / DC voltage regulator of model LN2272. The LN2272 small boost DC / DC voltage regulator is a micro, high-efficiency, boost-type DC / DC regulator. The circuit consists of modules such as a current-mode PWM control loop, an error amplifier, a ramp compensation circuit, a comparator, and a power switch. This chip can work efficiently and stably within a wide load range. It has a built-in 3A power switch. When powered by a lithium battery, it can provide an output current of 1.2A, a static current of 80μA, and a conversion efficiency of up to 90%, which can efficiently extend the battery life. The output voltage can be set by adjusting two external resistors. It includes the booster U2, resistor R2, resistor R3, inductor L1, capacitor C4, and ground terminals GND2 and GND3. The booster U2 includes a VIN input terminal, an EN enable terminal, a GND ground terminal, a SW input terminal, and an FB output terminal. The VIN input terminal, the EN enable terminal, one end of capacitor C4, one end of inductor L1, the other end of resistor R5, the positive input terminal of the battery module 30, the VDD input terminal of the control module 20, the VDD input terminal of the control module 20, and the VCC input terminal of the NFC matching module 10 are electrically connected. The other end of capacitor C4 is electrically connected to the ground terminal GND2. The SW input terminal is electrically connected to the other end of inductor L1 and one end of resistor R2. The FB output terminal is electrically connected to the other end of resistor R2 and one end of resistor R3. The other end of resistor R3 is electrically connected to the ground terminal GND3. Capacitor C4 is used to filter the AC signal in the DC power at the VIN input terminal. Inductor L1 is used to transfer the stored energy to the output side of the boost converter during the switching cycle. Resistors R2 and R3 are used to adjust the output voltage of the booster U2.

[0039] The charging switch module 60 includes a discharge switching switch U3 and a ground terminal GND4. The discharge switching switch U4 uses a switch chip of model EC853, which includes a VIN input terminal, a GND output terminal, an L1 input terminal, an L2 output terminal, an L3 input terminal, and an L4 output terminal. The VIN input terminal is electrically connected to the PA6 input terminal of the control module 20. The GND output terminal is connected to the ground terminal GND4. The L1 input terminal is electrically connected to the other end of inductor L1 and the other end of resistor R2. The L3 input terminal is electrically connected to the negative input terminal of the battery module 30, the GND ground terminal of the boost module 50, the GND input terminal of the NFC detection module 11, the GND input terminal of the NFC identification module 12, the VABT input terminal of the control module 20, and the other end of resistor R4. When a high-level voltage is received at the VIN input terminal, conduction occurs between the L1 input terminal and the L2 output terminal, and between the L3 input terminal and the L4 output terminal.

[0040] The wireless transmission module 70 includes a transmission module U4, a coil, and a capacitor C5. The transmission module U4 uses a wireless charging transmitter controller of model IP6805U. The wireless charging transmitter controller is a wireless charging transmitter-side control SoC chip, which is compatible with the latest WPC Qiv1.2.4 standard, supports the fast charging protocol, can establish communication with the receiving end, and start power transmission. Once the battery on the receiver is fully charged, the IP6805U terminates the power transmission. The IP6805U integrates a full-bridge drive circuit and full-bridge power MOS inside the chip, with a high degree of internal circuit integration, which can significantly reduce the solution size and BOM cost. It includes a VIN input terminal, a GND input terminal, an LX1 output terminal, and an LX2 output terminal. The coil includes two connection terminals AC1 and AC2. The VIN input terminal is electrically connected to the L2 output terminal of the charging switch module 60, the GND input terminal is electrically connected to the L4 output terminal of the charging switch module 60, the LX1 output terminal is electrically connected to the other end of the capacitor C5, the other end of the capacitor C5 is electrically connected to the AC1 terminal of the coil, and the LX2 output terminal is electrically connected to the AC2 terminal of the coil. The capacitor C5 and the coil are connected in series to form an LC resonant circuit, which has a low impedance at the resonant frequency and can adjust the resonant frequency of the coil to match the operating frequency of the transmitter end, so as to maximize the power transmission efficiency and reduce energy loss.

[0041] The working principle of the present utility model: When in use, the present utility model detects the NFC tag data of the charging device through the NFC matching module, identifies the identity data of the NFC tag, matches the identified NFC identity data with the identity data stored in the NFC matching module, and sends the matching result to the control module. When the identity data is matched, the control module turns on the charging switch module through control, turns on the wireless transmission module, the voltage in the battery module is boosted and then reaches the wireless transmission module. The wireless transmission module converts the boosted direct current into an alternating magnetic field and starts charging the charging device. The control module displays the working state of the power bank through the indication module. By utilizing the characteristics of fast and convenient data transmission of NFC, the matching of the charging device is completed and the charging device is charged, effectively preventing the occurrence of the wireless power bank being used by others. Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A charging matching circuit for a wireless power bank, characterized in that Comprising: An NFC matching module (10), where the NFC matching module (10) includes an NFC detection module (11) and an NFC identification module (12). The NFC detection module (11) and the NFC identification module (12) are electrically connected, and are used to generate an alternating magnetic field to detect the NFC tag of the charging device, receive the magnetic field signal sent from the NFC tag, and convert it into the identity data of the NFC tag and send it to the NFC identification module (12). The NFC identification module (12) is electrically connected to the control module (20), and is used to match the received identity data of the identified NFC tag with the identity data stored in the NFC identification module (12), and send the matching result to the control module (20); A control module (20), where the control module (20) is used to receive the matching result sent by the NFC identification module (12), and send a control instruction to the charging switch module (60) according to the matching result; A battery module (30), where the battery module (30) is electrically connected to the NFC matching module (10), the control module (20), and the boost module (50), and is used to provide a control power supply and a wireless charging power supply; An indication module (40), where the indication module (40) is electrically connected to the control module (20), and is used to display the working state of the power bank under the control instruction of the control module (20); A boost module (50), where the boost module (50) is electrically connected to the battery module (30), and is used to convert the voltage value stored in the battery module (30) into the voltage value required for wireless discharging; A charging switch module (60), where the charging switch module (60) is electrically connected to the control module (20) and the wireless transmission module (70), and is used to connect and disconnect the circuit connection between the boost module (50) and the wireless transmission module (70) under the control instruction of the control module (20); A wireless transmission module (70), where the wireless transmission module (70) is used to convert the boosted direct current into an alternating magnetic field for energy transfer.

2. The charging matching circuit of a wireless power bank according to claim 1, wherein: The NFC matching module (10) includes an NFC detection module (11) and an NFC identification module (12). The NFC detection module (11) includes an NFC controller U5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, an inductor L2, an inductor L3, an antenna L4, a ground terminal GND5, and a ground terminal GND6. The NFC controller U5 includes a GND input terminal, a VCC input terminal, an RST output terminal, a MISO communication terminal, a MOSI communication terminal, an SCK input terminal, an NSS input terminal, an RX input terminal, a VMID output terminal, a TX1 output terminal, a TVSS output terminal, and a TX2 output terminal. The RX input terminal is electrically connected to one end of the resistor R6 and one end of the capacitor C6. The other end of the resistor R6 is electrically connected to the VMID output terminal and one end of the capacitor C7. The other end of the capacitor C7 is electrically connected to the ground terminal GND5. The other end of the capacitor C6 is electrically connected to one end of the resistor R7. The other end of the resistor R7 is electrically connected to one end of the capacitor C7 and one end of the capacitor C8. The TX1 output terminal is connected in series with the inductor L3, the capacitor C7, the resistor R8, and the AC1 terminal of the antenna L4. The TX2 output terminal is connected in series with the inductor L2, the capacitor C10, the resistor R9, and the AC2 terminal of the antenna L4. The VMID output terminal is electrically connected to the ground terminal GND6, the other end of the capacitor C8, one end of the capacitor C9, one end of the capacitor C11, one end of the capacitor C12, and the AC3 terminal of the antenna L4. The other end of the capacitor C9 is electrically connected to one end of the capacitor C10. The other end of the capacitor C11 is electrically connected to one end of the resistor R8. The other end of the capacitor C12 is electrically connected to one end of the resistor R9 and one end of the capacitor C10. The NFC identification module (12) is an NFC identifier U6, including an IO12 input terminal, an IO13 input terminal, an IO14 input terminal, an IO15 input terminal, an IO16 input terminal, an IO0 output terminal, a VCC input terminal, and a GND input terminal. The IO12 input terminal, the IO13 input terminal, the IO14 input terminal, the IO15 input terminal, and the IO16 input terminal are respectively electrically connected to the RST output terminal, the MISO communication terminal, the MOSI communication terminal, the SCK input terminal, and the NSS input terminal of the NFC detection module (11).

3. The charging matching circuit of a wireless power bank according to claim 2, wherein: The control module (20) includes a controller U1, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a crystal oscillator Y1, and a ground terminal GND1. The controller U1 includes a PC14 input terminal, a PC15 input terminal, a PA1 output terminal, a PA2 output terminal, a PA3 output terminal, a PA4 output terminal, a PA5 output terminal, a PA6 input terminal, a PA7 input terminal, a VABT input terminal, and a VDD input terminal. The PA7 input terminal is electrically connected to the IO0 output terminal of the NFC recognition module (12). The crystal oscillator Y1 is connected in series between the PC14 input terminal and the PC15 input terminal. The PC14 input terminal is electrically connected to one end of the capacitor C2. The PC15 input terminal is electrically connected to one end of the capacitor C1. The other end of the capacitor C2 is electrically connected to the other end of the capacitor C1 and the ground terminal GND1. The capacitor C3 is connected in series between the VABT input terminal and the VDD input terminal. The battery module (30) includes a positive input terminal and a negative input terminal. The indication module (40) includes LED lights D1, D5LED lights D2, LED lights D3, LED lights D4, and resistors R1, R4, and R5. The anodes of the LED lights D1, D5LED lights D2, LED lights D3, and LED lights D4 are electrically connected to the PA1 output terminal, the PA2 output terminal, the PA3 output terminal, and the PA4 output terminal of the controller respectively. The cathodes of the LED lights D1, D5LED lights D2, LED lights D3, and LED lights D4 are electrically connected to one end of the resistor R1. The other end of the resistor R1 is electrically connected to the ground terminal GND1. One end of the resistor R5 and one end of the resistor R4 are electrically connected to the PA6 input terminal of the control module (20).

4. A wireless power bank charging matching circuit according to claim 3, characterized in that: The boost module (50) includes a booster U2, a resistor R2, a resistor R3, an inductor L1, a capacitor C4, and ground terminals GND2 and GND3. The booster U2 includes a VIN input terminal, an EN enable terminal, a GND ground terminal, an SW input terminal, and an FB output terminal. The VIN input terminal, the EN enable terminal, one end of the capacitor C4, one end of the inductor L1, the other end of the resistor R5, the positive input terminal of the battery module (30), the VDD input terminal of the control module (20), the VCC input terminal of the NFC detection module (11), and the VCC input terminal of the NFC identification module (12) are electrically connected. The other end of the capacitor C4 is electrically connected to the ground terminal GND2. The SW input terminal is electrically connected to the other end of the inductor L1 and one end of the resistor R2. The FB output terminal is electrically connected to the other end of the resistor R2 and one end of the resistor R3. The other end of the resistor R3 is electrically connected to the ground terminal GND3. The charging switch module (60) includes a discharge switching switch U3 and a ground terminal GND4. The discharge switching switch U4 includes a VIN input terminal, a GND output terminal, an L1 input terminal, an L2 output terminal, an L3 input terminal, and an L4 output terminal. The VIN input terminal is electrically connected to the PA6 input terminal of the control module (20). The GND output terminal is connected to the ground terminal GND4. The L1 input terminal is electrically connected to the other end of the inductor L1 and the other end of the resistor R2. The L3 input terminal is electrically connected to the negative input terminal of the battery module (30), the GND ground terminal of the boost module (50), the GND input terminal of the NFC detection module (11), the GND input terminal of the NFC identification module (12), the VABT input terminal of the control module (20), and the other end of the resistor R4. The wireless transmission module (70) includes a transmission module U4, a coil, and a capacitor C5. The transmission module U4 includes a VIN input terminal, a GND input terminal, an LX1 output terminal, and an LX2 output terminal. The coil includes two connection terminals AC1 and AC2. The VIN input terminal is electrically connected to the L2 output terminal of the charging switch module (60). The GND input terminal is electrically connected to the L4 output terminal of the charging switch module (60). The LX1 output terminal is electrically connected to the other end of the capacitor C5. The other end of the capacitor C5 is electrically connected to the AC1 terminal of the coil. The LX2 output terminal is electrically connected to the AC2 terminal of the coil.

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