Self-starting wireless power bank charging circuit

Abstract

The utility model provides a self-starting wireless power bank charging circuit, and relates to the technical field of wireless power bank charging. According to the utility model, the discharge detection module detects whether a receiving device exists when the coil module emits an alternating magnetic field and sends a detection result to the control module, the control module controls the discharge starting module to maintain an on state and close the discharge starting module at the same time, and the boost module boosts the voltage of the battery module, so that the detection result is output. A high-frequency signal is generated through the inversion module and sent to the coil module to generate an alternating magnetic field to wirelessly charge a mobile phone device, the charging detection module sends a detection result to the control module when detecting that the coil module receives the alternating magnetic field signal, and the control module keeps an on state by controlling the charging starting module. The rectification module converts a high-frequency signal sent by the coil module into direct current, the direct current is stored in the battery module after voltage reduction of the voltage reduction module, and the indicating lamp module displays the working state of the power bank according to an instruction of the control module.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless power bank charging, in particular to a self-starting wireless power bank charging 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 extra 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. However, the existing wireless power banks have a single function and require users to press a button to start charging, which brings inconvenience to users.

[0003] The publication number CN213990229U provides a self-starting wireless power bank charging circuit, including a main control IC module, a lithium battery protection circuit, a magnetic induction switch, an MCU control module and a wireless charging circuit. The main control IC module is electrically connected to the lithium battery protection circuit, the magnetic induction switch is electrically connected to the MCU control module, and the wireless charging circuit is electrically connected to the main control IC module. The utility model is scientific and reasonable, safe and convenient to use. When the charging device approaches the wireless power bank, the magnetic induction switch senses the magnetic field of the charging device and transmits a signal to the MCU control module. The MCU control module activates the wireless power bank to wirelessly charge the charging device.

[0004] However, this circuit detects the charging device through a magnetic induction switch. When facing external environmental changes, such as electromagnetic interference or temperature changes, it may affect its normal operation, which may lead to a decrease in the sensitivity of the switch or frequent misjudgments, thus affecting the stability and durability of the power bank. At the same time, this circuit can only be used to charge devices and cannot charge itself wirelessly.

[0005] Based on the above problems, there is an urgent need in the field for a self-starting wireless power bank charging circuit that is simple to operate, has strong adaptability, can perform wireless bidirectional charging, and can automatically detect charging and discharging. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a self-starting wireless power bank charging circuit to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A self-starting wireless power bank charging circuit, including:

[0009] A coil module, which is electrically connected to a discharge detection module, a discharge start module, and a charging start module, and is used to automatically generate an alternating magnetic field after the discharge start module is turned on, and automatically receive the alternating magnetic field after the charging start module is turned on for energy transfer;

[0010] A discharge detection module, which is electrically connected to a control module, and is used to detect the current data when the coil module emits an alternating magnetic field and send it to the control module;

[0011] A discharge start module, which is electrically connected to an inverter module and a control module, and is used to turn on and off the circuit connection between the inverter module and the coil module under the control instruction of the control module;

[0012] An inverter module, which is electrically connected to a boost module, and is used to convert the boosted direct current into a high-frequency signal alternating current for wireless energy transmission;

[0013] A boost module, which is electrically connected to a battery module, and is used to convert the voltage value stored in the battery module into the voltage value required for wireless discharge;

[0014] A battery module, which is electrically connected to a rectification module, a buck module, and a control module, and is used to store and release electric energy and supply power for the operation of the system;

[0015] A charging detection module, which is electrically connected to a charging start module and a control module, and is used to detect the voltage data received by the coil module and send it to the control module;

[0016] A charging start module, which is electrically connected to the coil module, a rectification module, and a control module, and is used to turn on and off the circuit connection between the rectification module and the control module under the control instruction of the control module;

[0017] A rectification module, which is electrically connected to a buck module and a battery module, and is used to operate at the voltage provided by the battery module and convert the received high-frequency signal alternating current for wireless energy transmission into direct current;

[0018] A buck module, which is electrically connected to a battery module, and is used to convert the received charging voltage value into the storage voltage value of the battery module to charge the battery module;

[0019] A control module, which is used to receive the voltage and current data detected by the discharge detection module and the charging detection module, and send control direct current to the discharge start module, the charging start module, and the indication module;

[0020] An indication module, which is electrically connected to the control module, and is used to display the charge and discharge status of the power bank under the control instruction of the control module.

[0021] In this embodiment, the coil module includes two connection terminals AC1 and AC2 and a capacitor C5. The discharge detection module consists of a diode D1, a resistor R5, a resistor R4, a resistor R10, a capacitor C6, a comparator B1 and a ground terminal GND5. The comparator B1 includes a positive input terminal, a negative input terminal, a V+ input terminal, a V- input terminal and an output terminal. The cathode of the diode D1 is electrically connected to the AC1 terminal of the coil module, and the anode of the diode D1 is electrically connected to the positive input terminal of the resistor comparator B1 and one end of the resistor R10. The negative input terminal of the comparator B1 is electrically connected to one end of the resistor R5 and one end of the resistor R4. The other end of the resistor R5 is electrically connected to one end of the capacitor C6, the V- input terminal of the comparator B1 and the ground terminal GND5. The other end of the capacitor C6 is electrically connected to the other end of the resistor R4, the V+ input terminal of the comparator B1 and the VIN input terminal of the discharge start module. The output terminal of the comparator B1 is connected to the PA8 interface of the control module. The discharge start module includes a discharge switch U4 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 GND output terminal is connected to the ground terminal GND4. The L2 output terminal is electrically connected to the other end of the resistor R10. The L4 output terminal is electrically connected to the AC2 terminal of the coil module. The L1 input terminal is electrically connected to one end of the capacitor C5. The inverter module is an inverter U3, including a VIN input terminal, a GND input terminal, an LX1 output terminal and an LX2 output terminal. The LX1 output terminal is electrically connected to the other end of the capacitor C5. The LX2 output terminal is electrically connected to the L3 input terminal of the discharge start module. The boost module 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, a SW input terminal and an FB output terminal. The VIN input terminal, the EN enable terminal, one end of the capacitor C4 and one end of the inductor L1 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, one end of the resistor R2 and the VIN input terminal of the inverter module. 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 battery module includes a power positive terminal and a power negative terminal.

[0022] In this embodiment, the charging detection module includes a resistor R6, a resistor R7, a capacitor C6, and a ground terminal GND6. The resistor R6, the resistor R7, and the ground terminal GND6 are connected in series, and the capacitor C11 is connected in parallel with the resistor R7. The charging start module is a charging switch U7, which includes a VIN input terminal, a GND output terminal, an L1 output terminal, an L2 input terminal, an L3 output terminal, an L4 input terminal, and a ground terminal GND4. The L2 input terminal is electrically connected to the AC1 terminal of the coil module, the L4 input terminal is electrically connected to the AC2 terminal of the coil module, and the L3 output terminal is electrically connected to one end of the resistor R6. The rectification module includes a rectifier U6, a capacitor C7, and a capacitor C8. The rectifier U6 includes an AC1 input terminal, an AC2 input terminal, an EN enable terminal, an OUT output terminal, and a GND ground terminal. The AC1 input terminal is electrically connected to the L3 output terminal of the charging start module, the AC2 input terminal is electrically connected to the L1 output terminal of the charging start module through the capacitor C7, and the capacitor C8 is connected in series between the OUT output terminal and the GND ground terminal. The buck module includes a buck converter U5, a resistor R8, and a resistor R9. The buck converter U5 includes a VIN input terminal, a CE input terminal, a GND output terminal, an LX output terminal, and an FB input terminal. The VIN input terminal, the CE input terminal, and the OUT output terminal of the rectification module are electrically connected, and the FB input terminal is electrically connected to one end of the resistor R8 and one end of the resistor R9.

[0023] In this embodiment, the control module includes a controller U1, capacitors C1, C2, C3, a resistor R1, a crystal oscillator Y1, and a ground terminal GND1. The controller U1 includes input terminals PC14, PC15, output terminals PA1, PA2, PA3, PA4, PA5, PA6, PA7, input terminals PA8, PA9, a VDD input terminal, and a VABT input terminal. The VDD input terminal is electrically connected to the positive terminal of the power supply, the other end of the inductor L1, the EN enable terminal of the rectifier U6, the LX output terminal of the step-down voltage regulator U5, and the other end of the resistor R9. The VABT input terminal is electrically connected to the negative terminal of the power supply, the GND ground terminal of the boost converter U2, the GND input terminal of the inverter module, the other end of the resistor R8, the GND output terminal of the step-down voltage regulator U5, and the GND ground terminal of the rectifier U6. 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, and 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 PA5 output terminal is electrically connected to the VIN input terminal of the charging start module. The PA6 input terminal is electrically connected to one end of the resistor R6 of the charging detection module. The PA7 output terminal is electrically connected to the VIN input terminal of the discharge start module. The PA8 input terminal is electrically connected to one end of the capacitor C6 of the discharge detection module. The indication module includes LED lights D2, D3, D4, D5, and a resistor R1. One end of the resistor R1 is electrically connected to the ground terminal GND1 of the control module, and the other end is electrically connected to the cathodes of the LED lights D2, D3, D4, D5. The anodes of the LED lights D2, D3, D4, D5 are electrically connected to the PA1 output terminal, PA2 output terminal, PA3 output terminal, and PA4 output terminal of the controller U1, respectively.

[0024] Compared with the prior art, the beneficial effects of the present utility model are:

[0025] In use, the present utility model sequentially turns on and off the charging start module and the discharging start module, and respectively detects whether there is a receiving device when the coil module emits an alternating magnetic field through the discharging detection module, and sends the detection result to the control module. The control module keeps the discharging start module in the on state by controlling it, and at the same time turns off the discharging start module. The boosting module boosts the voltage of the battery module, generates a high-frequency signal through the inverter module, and sends it to the coil module to generate an alternating magnetic field for wireless charging of the mobile phone device. When the charging detection module detects that the coil module receives the alternating magnetic field signal, it sends the detection result to the control module. The control module keeps the charging start module in the on state by controlling it. The rectifying module converts the high-frequency signal sent by the coil module into direct current, and after stepping down through the buck module, it is stored in the battery module. The indicator module displays the working state of the power bank according to the instruction of the control module. The charging detection module, the charging start module, the rectifying module, and the buck module realize the bidirectional charging of the wireless power bank. The charging detection module and the discharging detection module enable the wireless power bank to automatically start the bidirectional charging circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the system of the present utility model;

[0027] Figure 2 is a schematic circuit diagram of the present utility model.

[0028] In the figure: 10 coil module, 20 discharging detection module, 30 discharging start module, 40 inverter module, 50 boosting module, 60 battery module, 70 charging detection module, 80 charging start module, 90 rectifying module, 100 buck module, 110 control module, 120 indicator module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present 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 present utility model.

[0030] Embodiment:

[0031] Please refer to Figure 1-2 , the present utility model provides a technical solution:

[0032] A self-starting wireless power bank charging circuit, comprising a coil module 10, a discharge detection module 20, a discharge start module 30, an inverter module 40, a boost module 50, a battery module 60, a charging detection module 70, a charging start module 80, a rectification module 90, a buck module 100, a control module 110 and an indication module 120, wherein;

[0033] The coil module 10 is electrically connected to the discharge detection module 20, the discharge start module 30 and the charging start module 80, and is used for automatically generating an alternating magnetic field after the discharge start module 30 is turned on, and automatically receiving an alternating magnetic field after the charging start module 80 is turned on for energy transfer.

[0034] The discharge detection module 20 is electrically connected to the control module 110, and is used for detecting the current data when the coil module 10 emits an alternating magnetic field and sending it to the control module 110.

[0035] The discharge start module 30 is electrically connected to the inverter module 40 and the control module 110, and is used for turning on and off the circuit connection between the inverter module 40 and the coil module 10 under the control instruction of the control module 110.

[0036] Inverter module 40, the inverter module 40 is electrically connected to the boost module 50, and is used for converting the boosted direct current into a high-frequency signal alternating current for wireless energy transmission.

[0037] The boost module 50 is electrically connected to the battery module 60, and is used for converting the voltage value stored in the battery module 60 into the voltage value required for wireless discharge.

[0038] The battery module 60 is electrically connected to the rectification module 90, the buck module 100 and the control module 110, and is used for storing and releasing the electric quantity and supplying power for the system operation.

[0039] Further, the coil module 10 includes two connection terminals AC1 and AC2 and a capacitor C5. The capacitor C5 and the coil part are connected in series to form an LC circuit for adjusting its resonance frequency. By adjusting the capacitance value, it can be ensured that the coil at the receiving end reaches the best resonance matching at the operating frequency of the transmitting end, which can maximize the power transmission efficiency and reduce energy loss.

[0040] The discharge detection module 20 consists of a diode D1, a resistor R5, a resistor R4, a resistor R10, a capacitor C6, a comparator B1 and a ground terminal GND5. The comparator B1 includes a positive input terminal, a negative input terminal, a V + input terminal, a V - input terminal and an output terminal. The cathode of the diode D1 is electrically connected to the AC1 terminal of the coil module 10, and the anode of the diode D1 is electrically connected to the positive input terminal of the resistor comparator B1 and one end of the resistor R10. The negative input terminal of the comparator B1 is electrically connected to one end of the resistor R5 and one end of the resistor R4. The other end of the resistor R5 is electrically connected to one end of the capacitor C6, the V - input terminal of the comparator B1 and the ground terminal GND5. The other end of the capacitor C6 is electrically connected to the other end of the resistor R4, the V + input terminal of the comparator B1 and the VIN input terminal of the discharge start module 30. The output terminal of the comparator B1 is connected to the PA8 interface of the control module 110. When the wireless coil emits an alternating magnetic field, there is a wireless coil receiving the alternating magnetic field. Since energy needs to be provided for the receiving end, the transmitting chip will increase the output power to strengthen the energy transmission to the receiving coil, which will cause an increase in the current of the transmitting coil. When the current increases, the voltage between the resistor R10 and the coil module 10 increases, and the voltage at the negative input terminal of the comparator B1 increases. When the voltage at the negative input terminal exceeds the set voltage at the positive input terminal, a high - level signal is output to the PA8 interface of the control module 110. The diode D1 is used to prevent the coil module 10 from receiving an alternating magnetic field and generating an inverse voltage to interfere with the voltage signal acquisition. The resistors R4 and R5 are used to adjust the set voltage, and the capacitor C6 is used to filter out the clutter.

[0041] The discharge start module 30 includes a discharge switch U4 and a ground terminal GND4. The discharge switch U4 uses a switch chip of model EC853, including 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 GND output terminal is connected to the ground terminal GND4. The L2 output terminal is electrically connected to the other end of the resistor R10. The L4 output terminal is electrically connected to the AC2 terminal of the coil module 10. The L1 input terminal is electrically connected to one end of the capacitor C5. When the VIN input terminal receives a high - level voltage, conduction occurs between the L1 input terminal and the L2 output terminal, and conduction occurs between the L3 input terminal and the L4 output terminal.

[0042] The inverter module 40 is an inverter U3, which uses a wireless charging transmitter controller of model IP6805U, including a VIN input terminal, a GND input terminal, an LX1 output terminal and an LX2 output terminal. The LX1 output terminal is electrically connected to the other end of the capacitor C5. The LX2 output terminal is electrically connected to the L3 input terminal of the discharge start module 30.

[0043] The wireless charging transmitter controller is a wireless charging transmitter - side control SoC chip, compatible with the latest WPC Qi v1.2.4 standard, supporting fast - charging protocols. It can establish communication with the receiver to 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.

[0044] The boost module 50 includes a boost converter U2, a resistor R2, a resistor R3, an inductor L1, a capacitor C4, and ground terminals GND2 and GND3. The boost converter U2 uses a small - sized boost DC / DC voltage regulator of model LN2272. The LN2272 small - sized boost DC / DC voltage regulator is a miniature, 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, with 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 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, and one end of the inductor L1 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, one end of the resistor R2, and the VIN input terminal of the inverter module 40. 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 capacitor C4 is used to filter the AC signal in the DC power supply at the VIN input terminal. The inductor L1 is used to transfer the stored energy to the output side of the boost converter during the switching cycle. The resistors R2 and R3 are used to adjust the output voltage of the boost converter U2.

[0045] The battery module 60 uses a polymer lithium - battery of model HLCCSM, including a power positive terminal and a power negative terminal.

[0046] The charging detection module 70 is electrically connected to the charging start module 80 and the control module 110, and is used to detect the voltage data received by the coil module 10 and send it to the control module 110.

[0047] The charging start module 80 is electrically connected to the coil module 10, the rectification module 90, and the control module 110, and is used to turn on and off the circuit connection between the rectification module 90 and the control module 110 under the control instruction of the control module 110.

[0048] The rectification module 90 is electrically connected to the buck module 100 and the battery module 60, and is used to operate at the voltage provided by the battery module 60, and convert the received high-frequency signal alternating current for wireless energy transmission into direct current.

[0049] The buck module 100 is electrically connected to the battery module 60, and is used to convert the received charging voltage value into the storage voltage value of the battery module 60 to charge the battery module 60.

[0050] Further, the charging detection module 70 includes a resistor R6, a resistor R7, a capacitor C6 and a ground terminal GND6. The resistor R6, the resistor R7 and the ground terminal GND6 are connected in series, and the capacitor C11 is connected in parallel with the resistor R7. When the coil module 10 receives an alternating magnetic field, an induced voltage difference is generated between the two ends AC1 and AC2 of the coil module 10 due to Faraday's law of electromagnetic induction. By detecting the voltage value between the resistor R6 and the resistor R7, it can be determined whether the power bank is being charged. The capacitor C6 is used to filter out the clutter between the induced voltages.

[0051] The charging start module 80 is a charging switch U7, which uses a switch chip of model EC853, and includes a VIN input terminal, a GND output terminal, an L1 output terminal, an L2 input terminal, an L3 output terminal, an L4 input terminal and a ground terminal GND4. The L2 input terminal is electrically connected to the AC1 terminal of the coil module 10, the L4 input terminal is electrically connected to the AC2 terminal of the coil module 10, and the L3 output terminal is electrically connected to one end of the resistor R6. 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 conduction occurs between the L3 input terminal and the L4 output terminal.

[0052] The rectification module 90 includes a rectifier U6, a capacitor C7 and a capacitor C8. The rectifier U6 uses a wireless charging receiving chip of model IP6831. IP6831 is a highly integrated and efficient wireless charging receiving chip that complies with the Qi standard. The chip internally integrates an efficient synchronous rectification circuit, a power output circuit, a reverse protection circuit, and extremely low thermal loss, effectively improving the transient response and system efficiency of the chip. It includes an AC1 input terminal, an AC2 input terminal, an EN enable terminal, an OUT output terminal and a GND ground terminal. The AC1 input terminal is electrically connected to the L3 output terminal of the charging start module 80, the AC2 input terminal is electrically connected to the L1 output terminal of the charging start module 80 through the capacitor C7, the capacitor C8 is connected in series between the OUT output terminal and the GND ground terminal. The capacitor C7 is a resonant capacitor, which is connected in series with the receiving coil to form an LC resonant circuit to improve the transmission efficiency of the charging power. The capacitor C8 is used to reduce the voltage fluctuation and noise of the circuit.

[0053] The step-down module 100 includes a step-down voltage regulator U5, a resistor R8, and a resistor R9. The step-down voltage regulator U5 uses a step-down voltage regulator of model XT1712, which includes a VIN input terminal, a CE input terminal, a GND output terminal, an LX output terminal, and an FB input terminal. The VIN input terminal, the CE input terminal, and the OUT output terminal of the rectification module 90 are electrically connected. The FB input terminal is electrically connected to one end of the resistor R8 and one end of the resistor R9. The resistors R8 and R9 are used to adjust the output voltage of the LX output terminal. It has built-in overcurrent, overvoltage, overheat, output short circuit and many other protection circuits, and will automatically disconnect when exceeding the control value to protect the chip. It has the characteristics of micro encapsulation and low consumption current, and is most suitable for use inside the power supply of mobile devices.

[0054] The control module 110 is used to receive the voltage and current data detected by the discharge detection module 20 and the charge detection module 70, and send control direct current to the discharge start module 30, the charge start module 80, and the indication module 120.

[0055] The indication module 120 is electrically connected to the control module 110 and is used to display the charge and discharge status of the power bank under the control instruction of the control module 110.

[0056] Further, the control module 110 includes a controller U1, capacitors C1, C2, C3, a resistor R1, a crystal oscillator Y1, and a ground terminal GND1. The controller U1 uses a controller with the model number STM32F103C8T6, and 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 output terminal, a PA8 input terminal, a PA9 input terminal, a VDD input terminal, and a VABT input terminal. The VDD input terminal is electrically connected to the positive terminal of the power supply, the other end of the inductor L1, the EN enable terminal of the rectifier U6, the LX output terminal of the buck converter U5, and the other end of the resistor R9. The VABT input terminal is electrically connected to the negative terminal of the power supply, the GND ground terminal of the boost converter U2, the GND input terminal of the inverter module 40, the other end of the resistor R8, the GND output terminal of the buck converter U5, and the GND ground terminal of the rectifier U6. 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, and the PC15 input terminal is electrically connected to one end of the capacitor C1. The capacitor C1, the capacitor C2, and the crystal oscillator Y1 form a crystal oscillator circuit for providing an accurate clock signal. 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 PA5 output terminal is electrically connected to the VIN input terminal of the charging start module 80. The PA6 input terminal is electrically connected to one end of the resistor R6 of the charging detection module 70. The PA7 output terminal is electrically connected to the VIN input terminal of the discharging start module 30. The PA8 input terminal is electrically connected to one end of the capacitor C6 of the discharging detection module 20. When the PA8 input terminal receives the signal detected by the discharging detection module 20, a high-level signal is output through the PA7 output terminal to control the conduction between the L1 input terminal and the L2 output terminal, and the conduction between the L3 input terminal and the L4 output terminal of the discharging start module 30, and a low-level signal is output through the PA5 output terminal to control the disconnection between the L1 input terminal and the L2 output terminal, and the disconnection between the L3 input terminal and the L4 output terminal of the charging start module 80 to charge the wireless device.

[0057] When the PA6 input terminal receives the voltage signal detected by the charging start module 80, a high-level signal is output through the PA6 output terminal to control the conduction between the L1 input terminal and the L2 output terminal, and the conduction between the L3 input terminal and the L4 output terminal of the charging start module 80, and a low-level signal is output through the PA5 output terminal to control the disconnection between the L1 input terminal and the L2 output terminal, and the disconnection between the L3 input terminal and the L4 output terminal of the discharging start module 30 to charge the power bank.

[0058] The indicating module 120 includes an LED lamp D2, an LED lamp D3, an LED lamp D4, an LED lamp D5, and a resistor R1. One end of the resistor R1 is electrically connected to the ground terminal GND1 of the control module 110, and the other end is electrically connected to the cathodes of the LED lamp D2, the LED lamp D3, the LED lamp D4, and the LED lamp D5. The anodes of the LED lamp D2, the LED lamp D3, the LED lamp D4, and the LED lamp D5 are electrically connected to the PA1 output terminal, the PA2 output terminal, the PA3 output terminal, and the PA4 output terminal of the controller U1, respectively.

[0059] The working principle of the present utility model: When in use, the present utility model sequentially turns on and off the charging start module and the discharging start module, and respectively uses the discharging detection module to detect whether there is a receiving device when the coil module emits an alternating magnetic field, and sends the detection result to the control module. The control module keeps the discharging start module in the on state by controlling it, and at the same time turns off the discharging start module. The boosting module raises the voltage of the battery module, generates a high-frequency signal through the inverter module, and sends it to the coil module to generate an alternating magnetic field for wireless charging of the mobile phone device. When the charging detection module detects that the coil module receives the alternating magnetic field signal, it sends the detection result to the control module. The control module keeps the charging start module in the on state by controlling it. The rectifying module converts the high-frequency signal sent by the coil module into direct current, and after stepping down through the buck module, it is stored in the battery module. The indicator lamp module displays the working state of the power bank according to the instructions of the control module. The charging detection module, the charging start module, the rectifying module, and the buck module achieve the two-way charging of the wireless power bank. The charging detection module and the discharging detection module enable the wireless power bank to automatically start the two-way charging circuit.

[0060] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood 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 self-starting wireless power bank charging circuit, characterized in that, Including: A coil module (10), which is electrically connected to a discharge detection module (20), a discharge start module (30), and a charging start module (80), and is configured to automatically generate an alternating magnetic field after the discharge start module (30) is turned on, and automatically receive an alternating magnetic field after the charging start module (80) is turned on for energy transfer; A discharge detection module (20), which is electrically connected to a control module (110), and is configured to detect current data when the coil module (10) emits an alternating magnetic field and send it to the control module (110); A discharge start module (30), which is electrically connected to an inverter module (40) and a control module (110), and is configured to turn on and off the circuit connection between the inverter module (40) and the coil module (10) under the control instruction of the control module (110); An inverter module (40), which is electrically connected to a boost module (50), and is configured to convert the boosted direct current into a high-frequency signal alternating current for wireless energy transfer; A boost module (50), which is electrically connected to a battery module (60), and is configured to convert the voltage value stored in the battery module (60) into the voltage value required for wireless discharge; A battery module (60), which is electrically connected to a rectification module (90), a buck module (100), and a control module (110), and is configured to store and release electric power and supply power for system operation; A charging detection module (70), which is electrically connected to a charging start module (80) and a control module (110), and is configured to detect voltage data received by the coil module (10) and send it to the control module (110); A charging start module (80), which is electrically connected to the coil module (10), the rectification module (90), and the control module (110), and is configured to turn on and off the circuit connection between the rectification module (90) and the control module (110) under the control instruction of the control module (110); A rectification module (90), which is electrically connected to the buck module (100) and the battery module (60), and is configured to operate with the voltage provided by the battery module (60) and convert the received high-frequency signal alternating current for wireless energy transfer into direct current; A buck module (100), which is electrically connected to the battery module (60), and is configured to convert the received charging voltage value into the storage voltage value of the battery module (60) to charge the battery module (60); A control module (110), which is configured to receive voltage and current data detected by the discharge detection module (20) and the charging detection module (70), and send control direct current to the discharge start module (30), the charging start module (80), and an indication module (120); An indication module (120), electrically connected to the control module (110), is configured to display the charging and discharging status of the power bank under the control instruction of the control module (110).

2. The self-starting wireless power bank charging circuit according to claim 1, wherein: The coil module (10) includes two connection terminals AC1 and AC2 and a capacitor C5. The discharge detection module (20) consists of a diode D1, resistors R5, R4, R10, a capacitor C6, a comparator B1, and a ground terminal GND5. The comparator B1 includes a positive input terminal, a negative input terminal, a V+ input terminal, a V- input terminal, and an output terminal. The cathode of the diode D1 is electrically connected to the AC1 terminal of the coil module (10), and the anode of the diode D1 is electrically connected to the positive input terminal of the resistor comparator B1 and one end of the resistor R10. The negative input terminal of the comparator B1 is electrically connected to one end of the resistor R5 and one end of the resistor R4. The other end of the resistor R5 is electrically connected to one end of the capacitor C6, the V- input terminal of the comparator B1, and the ground terminal GND5. The other end of the capacitor C6 is electrically connected to the other end of the resistor R4, the V+ input terminal of the comparator B1, and the VIN input terminal of the discharge start module (30). The output terminal of the comparator B1 is connected to the PA8 interface of the control module (110). The discharge start module (30) includes a discharge switch U4 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 GND output terminal is connected to the ground terminal GND4. The L2 output terminal is electrically connected to the other end of the resistor R10. The L4 output terminal is electrically connected to the AC2 terminal of the coil module (10). The L1 input terminal is electrically connected to one end of the capacitor C5. The inverter module (40) is an inverter U3, including a VIN input terminal, a GND input terminal, an LX1 output terminal, and an LX2 output terminal. The LX1 output terminal is electrically connected to the other end of the capacitor C5. The LX2 output terminal is electrically connected to the L3 input terminal of the discharge start module (30). The boost module (50) includes a booster U2, resistors R2, 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, a SW input terminal, and an FB output terminal. The VIN input terminal, the EN enable terminal, one end of the capacitor C4, and one end of the inductor L1 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, one end of the resistor R2, and the VIN input terminal of the inverter module (40). 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 battery module (60) includes a power positive terminal and a power negative terminal.

3. The self-starting wireless power bank charging circuit according to claim 2, wherein: The charging detection module (70) includes a resistor R6, a resistor R7, a capacitor C6, and a ground terminal GND6. The resistor R6, the resistor R7, and the ground terminal GND6 are connected in series. The capacitor C11 is connected in parallel with the resistor R7. The charging start module (80) is a charging switch U7, which includes a VIN input terminal, a GND output terminal, an L1 output terminal, an L2 input terminal, an L3 output terminal, an L4 input terminal, and a ground terminal GND4. The L2 input terminal is electrically connected to the AC1 terminal of the coil module (10). The L4 input terminal and the AC2 terminal of the coil module (10) are electrically connected. The L3 output terminal is electrically connected to one end of the resistor R6. The rectification module (90) includes a rectifier U6, a capacitor C7, and a capacitor C8. The rectifier U6 includes an AC1 input terminal, an AC2 input terminal, an EN enable terminal, an OUT output terminal, and a GND ground terminal. The AC1 input terminal is electrically connected to the L3 output terminal of the charging start module (80). The AC2 input terminal is electrically connected to the L1 output terminal of the charging start module (80) through the capacitor C7. The capacitor C8 is connected in series between the OUT output terminal and the GND ground terminal. The buck module (100) includes a buck converter U5, a resistor R8, and a resistor R9. The buck converter U5 includes a VIN input terminal, a CE input terminal, a GND output terminal, an LX output terminal, and an FB input terminal. The VIN input terminal, the CE input terminal, and the OUT output terminal of the rectification module (90) are electrically connected. The FB input terminal is electrically connected to one end of the resistor R8 and one end of the resistor R9.

4. The self-starting wireless power bank charging circuit according to claim 3, characterized in that: The control module (110) 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 output terminal, a PA8 input terminal, a PA9 input terminal, a VDD input terminal, and a VABT input terminal. The VDD input terminal is electrically connected to the positive terminal of the power supply, the other end of the inductor L1, the EN enable terminal of the rectifier U6, the LX output terminal of the step-down converter U5, and the other end of the resistor R9. The VABT input terminal is electrically connected to the negative terminal of the power supply, the GND ground terminal of the boost converter U2, the GND input terminal of the inverter module (40), the other end of the resistor R8, the GND output terminal of the step-down converter U5, and the GND ground terminal of the rectifier U6. 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, and 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 PA5 output terminal is electrically connected to the VIN input terminal of the charging start module (80). The PA6 input terminal is electrically connected to one end of the resistor R6 of the charging detection module (70). The PA7 output terminal is electrically connected to the VIN input terminal of the discharge start module (30). The PA8 input terminal is electrically connected to one end of the capacitor C6 of the discharge detection module (20). The indication module (120) includes LED lights D2, D3, D4, D5, and a resistor R1. One end of the resistor R1 is electrically connected to the ground terminal GND1 of the control module (110), and the other end is electrically connected to the cathodes of the LED lights D2, D3, D4, D5. The anodes of the LED lights D2, D3, D4, D5 are electrically connected to the PA1 output terminal, the PA2 output terminal, the PA3 output terminal, and the PA4 output terminal of the controller U1, respectively.

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