Cooperative control circuit system of wireless charging relay coil and transmitting terminal

Abstract

The invention discloses a cooperative control circuit system of a wireless charging relay coil and a transmitting end, and belongs to the technical field of wireless charging. The cooperative control circuit system structurally comprises a direct current input module (1), a time sequence generation module (2), a step-up and step-down module (3), a transmitting coil module (4), a relay coil module (5), a receiving coil module (6), a cooperative control module (7) and a position control module (8). And the cooperative control module (7) outputs a control signal according to the acquired information, and drives a motor in the position control module (8) to drive the repeating coil to perform position adjustment, so that the repeating coil works at the optimal position. The problem that a traditional wireless charging system is short in transmission distance is effectively solved, the wireless transmission distance is expanded through the relay coil, the position of the relay coil is automatically adjusted according to the load, and the charging efficiency is optimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless charging, and in particular relates to a cooperative control circuit of a wireless charging relay coil and a transmitting end. Background Art

[0002] With the popularity of smart devices, wireless charging technology has attracted widespread attention and application due to its convenience. From the early days when it could only charge simple devices at a short distance and low power, it has now been gradually applied to a variety of devices such as mobile phones, tablets and even electric vehicles. However, in actual use, wireless charging technology still faces many challenges.

[0003] Distance limitation is a major problem. When the distance of traditional wireless charging is slightly far, the energy transmission efficiency will drop sharply, resulting in slower charging speed or even failure to charge. For example, in some public charging scenarios, the device and the transmitter cannot be close together, and the charging effect is greatly reduced. At the same time, when multiple devices are charged at the same time, the charging requirements of different devices are different. Existing technologies are difficult to achieve accurate and efficient energy distribution, and some devices are prone to charging too slowly or overheating.

[0004] The emergence of relay coil technology has alleviated the distance problem to a certain extent. It can receive and enhance the energy signal of the transmitter and then transmit it to the receiver. However, the current coordinated control of the relay coil and the transmitter is not intelligent and efficient enough. In most systems, the working status of the transmitter and the relay coil is relatively fixed and cannot be dynamically adjusted according to the real-time needs of the receiver and environmental changes, resulting in energy transmission efficiency that cannot be optimized.

[0005] In addition, in complex electromagnetic environments, wireless charging systems are susceptible to interference, and existing cooperative control circuits are difficult to effectively deal with interference and ensure charging stability and safety. Developing a circuit system that can achieve efficient cooperative control of the relay coil and the transmitter and adapt to different scenarios and equipment requirements is of great significance to promoting the further development and widespread application of wireless charging technology. Summary of the invention

[0006] In order to overcome the shortcomings of the background technology, the present invention provides a cooperative control circuit system of a wireless charging relay coil and a transmitting end, aiming to extend the charging distance, improve the charging efficiency, and at the same time achieve good adaptation to different devices to ensure the stable and efficient operation of the wireless charging system. This cooperative control circuit system is mainly composed of four parts: a transmitting end, a relay coil, a receiving end, and a cooperative control circuit. Each part cooperates with each other to complete the wireless charging energy transmission and control process.

[0007] The technical problem of the present invention is solved by the following technical solutions:

[0008] A cooperative control circuit system for a wireless charging relay coil and a transmitting end, which has a DC input module 1, a timing generation module 2, a step-up / step-down module 3, a transmitting coil module 4, a relay coil module 5, a receiving coil module 6, a cooperative control module 7 and a position control module 8; the DC input module 1 is connected to the step-up / step-down module 3 to provide a DC input voltage for the system; the timing generation module is connected to the transmitting coil module 4 to provide a PWM wave to control it; the transmitting coil module 4 is connected to the relay coil module 5, and the transmitting coil module 4 converts the DC input voltage processed by the step-up / step-down module into an AC voltage and sends it to the relay coil module 5; the relay coil module 5 is connected to the receiving coil module 6, and the relay coil module 5 processes the received AC voltage and sends it to the receiving coil module 6, which is processed by the receiving coil module 6 and converted into DC to output to the electrical load; the receiving coil module 6 is connected to the cooperative control module 7, and the cooperative control module 7 collects current and voltage information on the load branch in the receiving coil module 6; the cooperative control module 7 is connected to the position control module 8, and the transmitting coil L1 in the transmitting coil module 4, the relay coil L2 in the relay coil module 5 and the receiving coil L3 in the receiving coil module 6 are respectively installed on 3 mounting plates, and the cooperative control module 7 outputs a control signal according to the collected information to drive the motor in the position control module 8 to drive the relay coil L2 to perform position adjustment;

[0009] The structure of the timing generation module 2 described above is as follows: One end of resistor R4 and one end of resistor R6 are connected to one end of resistor R5. The other end of resistor R4 is connected to power supply VCC. The other end of resistor R5 is connected to the ground wire. The other end of resistor R6 is connected to one end of resistor R9 and the non-inverting input terminal of operational amplifier U1. The other end of resistor R9 and one end of potentiometer R8 are connected to the output terminal of operational amplifier U1. The positive power supply terminal of operational amplifier U1 is connected to the +12V power supply. The negative power supply terminal of operational amplifier U1 is connected to the ground wire. The other end of potentiometer R8 is connected to the sliding contact terminal of potentiometer R8 and one end of resistor R7. The other end of resistor R7, one end of capacitor C4, and the non-inverting input terminal of operational amplifier U2 are connected to the inverting input terminal of operational amplifier U1. The other end of capacitor C4 is connected to the ground wire. The inverting input terminal of operational amplifier U2 is connected to the sliding contact terminal of potentiometer R10. One end of potentiometer R10 is connected to the ground wire. The other end of potentiometer R10 is connected to the +12V power supply. The positive power supply terminal of operational amplifier U2 is connected to the +5V power supply. The negative power supply terminal of operational amplifier U2 is connected to the ground wire. The output port of operational amplifier U2 is denoted as output port CP_OUT1. The output port of operational amplifier U2 is connected to the gate of field effect transistor Q1 and the gate of field effect transistor Q2. The drain of field effect transistor Q1 is connected to the +5V power supply. The source of field effect transistor Q2 is connected to the ground wire. The source of field effect transistor Q1 is connected to the drain of field effect transistor Q2 as the output port, and this output port is denoted as CP_OUT2.

[0010] The boost - buck module 3 described above includes a duty cycle adjustment circuit and a boost - buck circuit. Among them, the structure of the duty cycle adjustment circuit is as follows: One end of resistor R11 is connected to the inverting input terminal of operational amplifier U5 and one end of capacitor C5. The other end of resistor R11 is connected to the negative electrode of diode D7 and the positive electrode of diode D6. The other end of capacitor C5 is connected to one end of resistor R15 and the ground wire. The other end of resistor R15 is connected to the non-inverting input terminal of operational amplifier U5 and one end of resistor R14. The positive electrode of diode D7 is connected to the upper end of potentiometer R12. The negative electrode of diode D6 is connected to the lower end of potentiometer R12. The output port of operational amplifier U5 is connected to one end of resistor R13. The other end of resistor R13 is connected to the sliding contact terminal of potentiometer R12, the other end of R14, and one end of bidirectional voltage regulator D8 as the output port, and this output port is denoted as CP_OUT3. The other end of bidirectional voltage regulator D8 is connected to the ground wire.

[0011] The structure of the boost - buck circuit is as follows: The collector of transistor Q7 is connected to the DC input VPP. The base input CP_IN3 of transistor Q7 is connected to the output port CP_OUT3. The emitter of transistor Q7 is connected to one end of inductor L4 and the cathode of diode D5. The anode of diode D5 is connected to the cathode of electrolytic capacitor C6 and one end of resistor R16 as the output port, which is denoted as output port VDD1_OUT. The other end of inductor L4 is connected to the anode of electrolytic capacitor C6, the other end of resistor R16 and the ground wire as the output port, which is denoted as output port VDD2_OUT.

[0012] The structure of the transmitting coil module 4 is as follows: The drain of field - effect transistor Q3 is connected to the drain of field - effect transistor Q4, which is denoted as input port VDD2_IN. Input port VDD2_IN is connected to the output port VDD2_OUT in the boost - buck module 3. The gates of field - effect transistor Q3 and field - effect transistor Q6 are denoted as input port CP_IN1. Input port CP_IN1 is connected to the output port CP_OUT1 in the timing generation module 2. The gates of field - effect transistor Q4 and field - effect transistor Q5 are denoted as input port CP_IN2. Input port CP_IN2 is connected to the output port CP_OUT2 in the timing generation module 2. The source of field - effect transistor Q3 is connected to the drain of field - effect transistor Q5 and one end of capacitor C1. The source of field - effect transistor Q4 is connected to the drain of field - effect transistor Q6 and one end of resistor R1. The other end of inductor C1 is connected to the same - name end of transmitting coil L1. The other end of resistor R1 is connected to the other end of transmitting coil L1. The sources of field - effect transistor Q5 and field - effect transistor Q6 are connected, which is denoted as input port VDD1_IN. Input port VDD1_IN is connected to the output port VDD1_OUT in the boost - buck module 3. The transmitting coil L1 is fixed on the first mounting plate 81 of the position control module 8.

[0013] The structure of the relay coil module 5 is as follows: One end of capacitor C2 is connected to the same - name end of relay coil L2. The other end of capacitor C2 is connected to one end of resistor R2. The other end of relay coil L2 is connected to the other end of resistor R2. The relay coil L2 is fixed on the second mounting plate 82 of the position control module 8.

[0014] The structure of the receiving coil module 6 is as follows: One end of the capacitor C3 is connected to the same-named end of the receiving coil L3. The other end of the receiving coil L3 is connected to one end of the resistor R3. The other end of the capacitor C3 is connected to the positive electrode of the diode D1 and the negative electrode of the diode D3. The other end of the resistor R3 is connected to the positive electrode of the diode D2 and the negative electrode of the diode D4. The negative electrode of the diode D1 is connected to the negative electrodes of the diode D2, the positive electrode of the electrolytic capacitor C7, one end of the capacitor C8, and port 1 of the DC output P1. The positive electrode of the diode D3 is connected to the positive electrodes of the diode D4, the negative electrode of the electrolytic capacitor C7, the other end of the capacitor C8, one end of the resistor R18, and one end of the resistor R20. Port 2 of the DC output P1 is connected to the other end of the resistor R18 and one end of the resistor R19. The other end of the resistor R19 is connected to one end of the resistor R21 and the non-inverting input terminal of the operational amplifier U4. The other end of the resistor R21 is connected to the ground wire. The other end of the resistor R20 is connected to the inverting input terminal of the operational amplifier U4 and one end of the R22. The positive power supply terminal of the operational amplifier U4 is connected to the +12V power supply. The negative power supply terminal of the operational amplifier U4 is connected to the ground wire. The output terminal of the operational amplifier U4 is connected to the other end of the resistor R22 as the output port, and this port is denoted as the output port A1_OUT. The receiving coil L3 is fixed on the third mounting plate 83 of the position control module 8.

[0015] The structure of the collaborative control module 7 is as follows: One end of capacitor C9 is connected to one end of capacitor C10 and the ground wire. The other end of capacitor C9 is connected to one end of crystal oscillator X1 and the input port XTAL1 of microcontroller U7. The other end of crystal oscillator X1 is connected to the other end of C10 and the input port XTAL2 of microcontroller U7. One end of capacitor C11 is connected to the +5V power supply and one end of the button. The other end of capacitor C11 is connected to the other end of the button, one end of resistor R23, and the input port RST of microcontroller U7. The other end of resistor R23 is connected to the ground wire. The input port AIN0 of AD conversion module U6 is denoted as input port A1_IN, and input port A1_IN is connected to output port A1_OUT in receiving coil module 6. The input port ADDR of AD conversion module U6 is connected to the input port GND of AD conversion module U6 and the ground wire. The output port SCL of AD conversion module U6 is connected to the input port P1.6 of microcontroller U7. The output port SDA of AD conversion module U6 is connected to the input port P1.7 of microcontroller U7. The output port P0.0 / AD0 of microcontroller U7 is connected to the input port D0 of display module LCD1602. The output port P0.1 / AD1 of microcontroller U7 is connected to the input port D1 of display module LCD1602 and one end of pin header RP1. The output port P0.2 / AD2 of microcontroller U7 is connected to the input port D2 of display module LCD1602 and one end of pin header RP1. The output port P0.3 / AD3 of microcontroller U7 is connected to the input port D3 of display module LCD1602 and one end of pin header RP1. The output port P0.4 / AD4 of microcontroller U7 is connected to the input port D4 of display module LCD1602 and one end of pin header RP1. The output port P0.5 / AD5 of microcontroller U7 is connected to the input port D5 of display module LCD1602 and one end of pin header RP1. The output port P0.6 / AD6 of microcontroller U7 is connected to the input port D6 of display module LCD1602 and one end of pin header RP1. The output port P0.7 / AD7 of microcontroller U7 is connected to the input port D7 of display module LCD1602 and one end of pin header RP1. One end of pin header RP1 is connected to the +5V power supply. The input port VBB of display module LCD1602 is connected to the input port VEE of display module LCD1602 and the ground wire. The input port VDD of display module LCD1602 is connected to the +5V power supply. The input port RS of display module LCD1602 is connected to the output P2.4 / A12 of microcontroller U7. The input port RW of display module LCD1602 is connected to the output P2.5 / A13 of microcontroller U7. The input port E of display module LCD1602 is connected to the output P2.6 / A14 of microcontroller U7. The output port P2. of microcontroller U70 / A8 is connected to the input port 1B of the motor drive module U8. The output port P2.1 / A9 of the single-chip microcomputer U7 is connected to the input port 2B of the motor drive module U8. The output port P2.2 / A10 of the single-chip microcomputer U7 is connected to the input port 3B of the motor drive module U8. The output port P2.3 / A11 of the single-chip microcomputer U7 is connected to the input port 4B of the motor drive module U8. Denote the output ports 1C, 2C, 3C, and 4C of the motor drive module U8 as U8_OUT1, U8_OUT2, U8_OUT3, and U8_OUT4 respectively, and connect them to the input ends of the four coils inside the motor 88 in the position control module 8. The input port of the motor drive module U8 is connected to one end of the capacitor C12 and the ground wire. The output port COM of the motor drive module U8 is connected to the other end of the capacitor C12 and the +12V power supply;.

[0016] The position control module 8 includes a first mounting plate 81, a second mounting plate 82, a third mounting plate 83, a first base 84, a second base 85, a third base 86, a slide rail 87, a motor 88, a gear 89, and a rack 80. The first mounting plate 81 is fixed on the first base 84. The second mounting plate 82 is fixed on the second base 85. The third mounting plate 83 is fixed on the third base 86. The three mounting plates are of the same size and their bottom edges are on the same horizontal line. The first base 84 and the third base 86 are connected by two identical slide rails. There are reserved holes on the second base 85 so that the second base 85 can slide freely on the slide rail 87. The rack 89 is as long as the slide rail 87 and is installed directly below the slide rail 87. The motor 88 is a four-phase stepper motor, and its transmission mechanism is connected to the rack 80 through the gear 89.

[0017] Beneficial effects:

[0018] 1. Breakthrough extension of charging distance: Traditional wireless charging technology is limited by the short transmission distance. However, in this invention, by introducing a relay coil, a new energy transmission path is constructed. The relay coil can receive the energy signal emitted by the transmitting end, strengthen it, and then transmit it to the receiving end. According to the communication principle, the effective distance of wireless charging is effectively extended, breaking the shackles of the traditional charging distance. When users use wireless charging devices, they no longer need to be limited near the charging device, greatly improving the convenience and freedom of charging, and broadening the application scope of wireless charging technology in practical scenarios.

[0019] 2. Excellent improvement in charging efficiency: The collaborative control circuit can obtain parameters such as voltage and current feedback from the receiving end in real time and conduct in-depth analysis according to the preset algorithm. By precisely regulating the mutual inductance value between the coils and simultaneously controlling the working state of the boost-buck circuit, it ensures that the energy output by the transmitting end precisely matches the charging requirements of the device, reducing the ineffective loss of energy.

[0020] 3. Wide device adaptation compatibility: Fully considering the diversity of charging devices in practical applications, the collaborative control circuit of the present invention demonstrates strong adaptive capabilities. Whether it is small devices such as smart watches, Bluetooth headsets, power banks, mobile phones, or large devices such as tablet computers and intelligent terminals, the collaborative control circuit can automatically adjust the relevant parameters of the relay coil according to the parameters fed back by the devices. It provides suitable charging efficiency and a stable charging environment for devices with different power requirements and different charging characteristics. Just like the good compatibility design of a communication system for various devices, it effectively solves the adaptation problems of different devices during wireless charging and promotes the wide application of wireless charging technology on more device types. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural block diagram of the present invention.

[0022] Figure 2 is the basic schematic diagram of the present invention.

[0023] Figure 3 is the circuit diagram of the timing generation module of the present invention.

[0024] Figure 4 is the circuit diagram of the duty cycle adjustment circuit of the present invention.

[0025] Figure 5 is the circuit diagram of the step-up and step-down circuit of the present invention.

[0026] Figure 6 is the circuit diagram of the transmitting coil module of the present invention.

[0027] Figure 7 is the circuit diagram of the relay coil module of the present invention.

[0028] Figure 8 is the circuit diagram of the receiving coil module of the present invention.

[0029] Figure 9 is the circuit diagram of the collaborative control module of the present invention.

[0030] Figure 10 is the structural diagram of the transmitting coil module, relay coil module, and receiving coil module of the present invention.

[0031] In the figure: 81 is the first mounting plate, 82 is the second mounting plate, 83 is the third mounting plate, 84 is the first base, 85 is the second base, 86 is the third base, 87 is the slide rail, 88 is the motor, 89 is the gear, and 80 is the rack.

[0032] The implementation, functional features, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be described in detail below with reference to the accompanying drawings.

[0034] The described embodiments are only a part of the embodiments of the present invention, rather than all of them; all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0035] Embodiment 1 Overall system structure

[0036] Figure 1 The overall system structure diagram of the present invention is shown. The system structure includes a DC input module 1, a timing generation module 2, a boost - buck module 3, a transmitting coil module 4, a relay coil module 5, a receiving coil module 6, a cooperative control module 7, and a position control module 8. The DC input module 1 is connected to the boost - buck module 3 to provide the DC input voltage for the system. The timing generation module is connected to the boost - buck module 3 and the transmitting coil module 4 to provide a PWM wave to control them. The transmitting coil module 4 is connected to the relay coil module 5. The transmitting coil module 4 converts the DC input voltage processed by the boost - buck module into an AC voltage and sends it to the relay coil module 5. The relay coil module 5 is connected to the receiving coil module 6. The relay coil module 5 processes the received AC voltage and sends it to the receiving coil module 6, which processes and converts it into DC to output to the electrical load. The receiving coil module 6 is connected to the cooperative control module 7. The cooperative control module 7 collects information such as current and voltage on the load branch in the receiving coil module 6. The cooperative control module 7 is connected to the timing generation module 2 and the position control module 8. The transmitting coil L1 in the transmitting coil module 4, the relay coil L2 in the relay coil module 5, and the receiving coil L3 in the receiving coil module 6 are respectively installed on three mounting plates in the position control module 8. The cooperative control module 7 outputs a control signal according to the collected information to drive the motor in the position control module 8 to drive the relay coil L2 for position adjustment.

[0037] Embodiment 2 Basic system principle

[0038] Figure 2 The topological structure diagram of the three - coil of the present invention is shown. The transmitting end includes a DC voltage source U1, a capacitor C1, a transmitting coil L1, and a resistor R1. The relay coil circuit includes a capacitor C2, a relay coil L2, and a resistor R2. The receiving end includes a capacitor C3, a receiving coil L3, and a resistor R3, and a load R17. At the resonant frequency ω0, ignoring R1, R2, and R3, according to Kirchhoff's voltage law, we have:

[0039]

[0040] Among them, through design, M13 can be made smaller than M12, and the influence of M13 can be ignored. In this way, the expressions of the system input and output power and transmission efficiency can be listed:

[0041]

[0042] It can be seen from the above transmission efficiency formula that when the system transmission efficiency reaches the maximum value, there is:

[0043]

[0044] In this formula, the maximum and minimum values of the transmission efficiency are affected by multiple variables. Among them, R1, R2, R3, and ω0 are fixed values preset by the system. In this embodiment, it is set that R1 = R2 = R3; while M12 and M23 can be changed by moving the position of the relay coil; in this system, the relay coil adopts a movable mechanical structure to adjust the position. When it is necessary to adjust M12 and M23, the cooperative control circuit sends a control command to the motor, and the motor drives the relay coil to move, thereby adjusting the distance and relative position between the relay coil and the transmitting coil and the receiving coil, changing the mutual inductance ratio, and realizing the adjustment of the optimal load value R17 to match various different loads actually connected.

[0045] Embodiment 3. The timing generation module 2 of the present invention

[0046] The structure of the timing generation module described in the present invention is as Figure 3As shown in the figure, for operational amplifier U1, at the non-inverting input terminal of operational amplifier U1, resistors R4, R5, R6, R9 and the output port of operational amplifier U1 form a positive feedback network; at the inverting input terminal, capacitor C4, resistor R7, adjustable resistor R8 and the output terminal form a negative feedback network. Operational amplifier U1 and the above components form a triangular wave generator, and a triangular wave signal is obtained at both ends of capacitor C4, which is denoted as Uc. The frequency of the triangular wave signal Uc can be adjusted by adjusting the resistance value of adjustable resistor R8, which can change the resistance value in the charging and discharging loop of capacitor C1, and then realize the function of adjustable frequency of triangular wave Uc. The triangular wave output from one end of capacitor C4 is input to the non-inverting input terminal of operational amplifier U2, forming a voltage comparator. Adjust the resistance value of adjustable resistor R10 to adjust the potential at the inverting input terminal of operational amplifier U2, and denote this potential as V1. When the triangular wave signal Uc is less than V1, the output terminal of operational amplifier U2 outputs GND; when the triangular wave signal Uc is greater than V1, the output terminal of operational amplifier U2 outputs +5V. Then a square wave signal CP is obtained at the output terminal of operational amplifier U2. The amplitude range of the square wave signal CP is the voltage value from GND to VDD, the frequency is the same as that of the triangular wave signal Uc, and the duty cycle is 50%; this signal is output from the output port CP_OUT1 to the field effect transistors Q3 and Q6 in the transmitting coil module 4 as the control signal for field effect transistors Q3 and Q6; this signal is input to an inverter composed of PMOS transistor Q1 and NMOS transistor Q2 to obtain a signal CP# opposite to the square wave signal CP, and this signal is output from the output port CP_OUT2 to the field effect transistors Q4 and Q5 in the transmitting coil module 4 as the control signal for field effect transistors Q4 and Q5.

[0047] Embodiment 4 Boost - buck module 3 of the present invention

[0048] To realize the function of adjustable charging voltage of this system, it is necessary to use the boost - buck module 3 of the present invention. The boost - buck module 3 includes a duty - cycle adjustment circuit and a boost - buck circuit. The duty - cycle adjustment circuit is as Figure 4As shown, for the voltage regulator diode D8, the terminal voltage when it conducts is denoted as ±Uz. When the terminal voltage output by the operational amplifier U5 is +Uz at a certain moment, the output of U5 at this time will charge the capacitor C5 in the forward direction through R13, the upper half of R12, D7, and R11 until the potential of the non-inverting input terminal of the operational amplifier U5 is the same as that of the inverting input terminal. At this time, when the potential of the inverting input terminal increases slightly, the output of U5 will jump from +Uz to -Uz. At this time, the output of U5 will charge the capacitor C5 in the reverse direction through R13, the lower half of R12, D6, and R11; that is, the position of the sliding terminal of the adjustable resistor R12 can be manually changed to change the resistance values of the upper and lower parts of the adjustable resistor R12 connected to the circuit, thereby affecting the charging and discharging time of the capacitor C5, and further affecting the duty cycle of the output waveform; when the sliding terminal of the adjustable resistor R12 is located in the upper half of the figure, the forward charging time is less than the reverse charging time at this time, and the duty cycle of the output waveform is less than 50%; when the sliding terminal of the adjustable resistor R12 is located in the lower half of the figure, the forward charging time is greater than the reverse charging time at this time, and the duty cycle of the output waveform is greater than 50%. This signal is output from the output port CP_OUT3 to the boost-buck circuit in the boost-buck module 3.

[0049] The boost-buck circuit is as Figure 5 shown. The working state of the boost-buck circuit is controlled by the switching transistor Q7. When the switching transistor Q7 conducts, the input current flows through the inductor L4 directly to the ground, and the output at the right end is mainly maintained by the discharge of the capacitor C6; when the switching transistor Q7 is turned off, the inductor L4 charges the capacitor C6. According to the inductor volt-second balance principle, when the duty cycle of the control signal is 50%, the input DC voltage remains unchanged. When the duty cycle of the control signal is greater than 50%, the input DC voltage will increase. When the duty cycle of the control signal is less than 50%, the input DC voltage will decrease, thereby realizing the control of the input DC voltage; the voltage processed by the boost-buck circuit is denoted as VDD, and it is output to the transmitting coil module 4 at the output ports VDD1_OUT and VDD2_OUT.

[0050] Embodiment 5 The transmitting coil module 4 of the present invention

[0051] The structure of the transmitting coil module 4 described in the present invention is as Figure 6As shown, the field effect transistors Q3, Q4, Q5, and Q6 form the four arms of the H-bridge, which are controlled by the clock signal CP output by CP_OUT1 and the CP# output by CP_OUT2 in the timing generation module. When the waveform output by CP_OUT1 is at a high level, the field effect transistors Q3 and Q6 are turned on. Correspondingly, at this time, the waveform output by CP_OUT2 is at a low level, and the field effect transistors Q4 and Q5 are turned off. When the waveform output by CP_OUT1 is at a low level, the field effect transistors Q3 and Q6 are turned off. Correspondingly, at this time, the waveform output by CP_OUT2 is at a high level, and the field effect transistors Q4 and Q5 are turned on. By repeating this cycle, an alternating voltage with the same frequency as the square wave signal CP and an amplitude ranging from +VDD to -VDD can be obtained on the transmitting coil L2 in the transmitting coil module 4.

[0052] Embodiment 6 The relay coil module 5 of the present invention

[0053] The structure of the relay coil module 5 of the present invention is as Figure 7 As shown, the main function of the relay coil circuit is to receive the AC energy signal transmitted from the transmitting end and send it to the receiving end. After the load is connected to the system and powered on, the relay coil module is controlled by the position control module 8 to slowly move from the transmitting coil end to the receiving coil end. At the same time, the cooperative control circuit collects information such as the current and voltage of the load branch for processing. After the relay coil completes the first round of movement, the cooperative control circuit calculates the maximum value of the system transmission efficiency during the first round of movement and records the position parameters at this time. Then, through the position control module 8, the relay coil module is controlled to perform the second round of movement and move to the position corresponding to the maximum value of the system transmission efficiency to achieve the matching of the optimal load value and the actual connected load.

[0054] Embodiment 7 The receiving coil module 6 of the present invention

[0055] The structure of the receiving coil module 6 of the present invention is as Figure 8As shown, a high-frequency alternating current is generated in the transmitting coil L1 in the transmitting coil module 4. The alternating current generates a changing magnetic field, and the changing magnetic field generates an alternating current. Therefore, electrical energy is transmitted through the relay coil L2 and then transmitted to the receiving coil L3. The electrical energy picked up by the receiving coil needs to be processed before it can be supplied to the terminal load for use. After the high-frequency current passes through the capacitor C3, it then passes through a rectifying circuit composed of diodes D1, D2, D3, and D4, and finally passes through a filtering circuit composed of electrolytic capacitor C7 and capacitor C8, and is converted into a DC output and supplied to both ends of the output port P1 to complete wireless energy transmission. At the same time, resistors R18, R19, R20, R21, R22 and the operational amplifier U4 form a current sampling circuit, which converts the current information on the load branch into a voltage signal through R18, and after being amplified by the operational amplifier U4, it is output to the AD conversion module in the subsequent cooperative control circuit for processing.

[0056] Embodiment 8. The cooperative control module 7 of the present invention

[0057] The structure of the cooperative control module 7 described in the present invention is as Figure 9 shown. The current and voltage information collected by the receiving-end circuit is converted into a digital signal by the AD conversion module U2 and transmitted to the single-chip microcomputer U7 for processing, and the current, voltage and other information are displayed in real time on the LCD1602 in the display module. After the single-chip microcomputer U7 processes the data according to the internally preset PID algorithm, it controls the motor drive module through an output electrical signal, controls the motor in the position adjustment module, and adjusts the position parameters of the relay coil module, so as to adjust the optimal load value of the system to achieve matching of the actually connected load.

[0058] Embodiment 9. The position control module 8 of the present invention

[0059] The structure of the position control module 8 described in the present invention is as Figure 10 shown. The transmitting coil L1, the relay coil L2, and the receiving coil L3 are respectively fixed on the mounting plates 81, 82, and 83. The first mounting plate 81 is fixed on the first base 84, the second mounting plate 82 is fixed on the second base 85, and the third mounting plate 83 is fixed on the third base 86. The three mounting plates are of the same size and their bottom edges are on the same horizontal line. The first base 84 and the third base 86 are connected by two identical slide rails. The cooperative control circuit controls the motor 88 through its motor drive module, and thus realizes the position movement of the relay coil L2.

[0060] Embodiment 10. System working process

[0061] System initialization

[0062] After the system is powered on, the cooperative control circuit, the transmitting end, the relay coil, and the receiving end are started in sequence; the cooperative control circuit executes a self-check program, performs electrical detection on the connection lines between various components through the internal detection circuit, determines whether the connection is normal, and whether there are faults such as open circuits and short circuits. If an abnormality is detected, a fault prompt is issued through the display module. After the self-check is completed, the cooperative control circuit performs initialization settings on the internal control algorithm parameters, stored device charging configuration information, etc., to prepare for the subsequent charging process.

[0063] Device Access and Parameter Detection

[0064] Place the device to be charged within the effective charging range of the receiving end, and the receiving coil of the receiving end starts to receive the energy signal transmitted by the transmitting end or the relay coil. The receiving end first converts the AC signal into a DC signal through a rectifying circuit, and then removes the clutter and noise in the signal through a filtering circuit to make the signal more stable. Then, a sampling resistor is used to collect the current and voltage information of the receiving coil. The collected analog signal is converted into a digital signal through an AD conversion circuit and transmitted to the single-chip microcomputer. The single-chip microcomputer preliminarily processes the received data and then displays it on the display screen to facilitate the user to understand the charging status.

[0065] Parameter Adjustment of Transmitting End and Relay Coil

[0066] After the system detects that the system is powered on and there is a device connected, the system will control the position adjustment module to drive the relay coil L3 to slowly move from the end of the transmitting coil L2 to the end of the receiving coil L1. At the same time, the cooperative control circuit collects and processes the current and voltage information of the load branch. After the relay coil module completes the first movement, the cooperative control circuit will adjust the position of the relay coil according to the optimal charging data collected, thereby adjusting the mutual inductance value between the coils to achieve the matching of the optimal load value of the system and the actually connected load.

[0067] Control of Timing Generation Circuit

[0068] The current detection module of the cooperative control circuit deeply analyzes and processes the voltage and current data collected by the sampling resistor at the receiving end, calculates the charging power and charging efficiency of the receiving end through an algorithm, and displays the results on the display screen. If the charging power of the system is low, the slider of the adjustable resistor can be manually adjusted to Figure 4 the lower half of the adjustable resistor R12 in Figure 4 to increase the charging power of the system. If the charging power of the system is too high, causing the device connected to the system to heat up, the slider of the adjustable resistor can be manually adjusted to

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A cooperative control circuit system for a wireless charging relay coil and a transmitting end, comprising a DC input module (1), a timing generation module (2), a step-up and step-down module (3), a transmitting coil module (4), a relay coil module (5), and a receiving coil module (6), characterized in that, The structure also has a cooperative control module (7) and a position control module (8); the DC input module (1) is connected to the boost-buck module (3) to provide the DC input voltage for the system; the timing generation module is connected to the transmitting coil module (4) to provide a PWM wave to control it; the transmitting coil module (4) is connected to the relay coil module (5), and the transmitting coil module (4) converts the DC input voltage processed by the boost-buck module into an AC voltage and sends it to the relay coil module (5); the relay coil module (5) is connected to the receiving coil module (6), and the relay coil module (5) processes the received AC voltage and sends it to the receiving coil module (6), which is processed by the receiving coil module (6) and converted into DC to output to the electrical load; the receiving coil module (6) is connected to the cooperative control module (7), and the cooperative control module (7) collects current and voltage information on the load branch in the receiving coil module (6); the cooperative control module (7) is connected to the position control module (8), and the transmitting coil L1 in the transmitting coil module (4), the relay coil L2 in the relay coil module (5), and the receiving coil L3 in the receiving coil module (6) are respectively installed on three mounting plates in the position control module (8). The cooperative control module (7) outputs a control signal according to the collected information to drive the motor in the position control module (8) to drive the relay coil L2 for position adjustment; The structure of the timing generation module (2) is as follows: One end of resistor R4 and one end of resistor R6 are connected to one end of resistor R5. The other end of resistor R4 is connected to power supply VCC. The other end of resistor R5 is connected to the ground wire. The other end of resistor R6 is connected to one end of resistor R9 and the non-inverting input terminal of operational amplifier U1. The other end of resistor R9 and one end of potentiometer R8 are connected to the output terminal of operational amplifier U1. The positive power supply terminal of operational amplifier U1 is connected to the +12V power supply. The negative power supply terminal of operational amplifier U1 is connected to the ground wire. The other end of potentiometer R8 is connected to the sliding terminal of potentiometer R8 and one end of resistor R7. The other end of resistor R7, one end of capacitor C4, and the non-inverting input terminal of operational amplifier U2 are connected to the inverting input terminal of operational amplifier U1. The other end of capacitor C4 is connected to the ground wire. The inverting input terminal of operational amplifier U2 is connected to the sliding terminal of potentiometer R10. One end of potentiometer R10 is connected to the ground wire. The other end of potentiometer R10 is connected to the +12V power supply. The positive power supply terminal of operational amplifier U2 is connected to the +5V power supply. The negative power supply terminal of operational amplifier U2 is connected to the ground wire. The output port of operational amplifier U2 is denoted as output port CP_OUT1. The output port of operational amplifier U2 is connected to the gate of field effect transistor Q1 and the gate of field effect transistor Q2. The drain of field effect transistor Q1 is connected to the +5V power supply. The source of field effect transistor Q2 is connected to the ground wire. The source of field effect transistor Q1 is connected to the drain of field effect transistor Q2 to serve as the output port, and this output port is denoted as CP_OUT2; The structure of the collaborative control module (7) is as follows: One end of capacitor C9 is connected to one end of capacitor C10 and the ground wire. The other end of capacitor C9 is connected to one end of crystal oscillator X1 and the input port XTAL1 of microcontroller U7. The other end of crystal oscillator X1 is connected to the other end of C10 and the input port XTAL2 of microcontroller U7. One end of capacitor C11 is connected to the +5V power supply and one end of the button. The other end of capacitor C11 is connected to the other end of the button, one end of resistor R23, and the input port RST of microcontroller U7. The other end of resistor R23 is connected to the ground wire. The input port AIN0 of AD conversion module U6 is denoted as input port A1_IN, and input port A1_IN is connected to output port A1_OUT in the receiving coil module (6). The input port ADDR of AD conversion module U6 is connected to the input port GND of AD conversion module U6 and the ground wire. The output port SCL of AD conversion module U6 is connected to the input port P1.6 of microcontroller U7. The output port SDA of AD conversion module U6 is connected to the input port P1.7 of microcontroller U7. The output port P0.0 / AD0 of microcontroller U7 is connected to the input port D0 of display module LCD1602. The output port P0.1 / AD1 of microcontroller U7 is connected to the input port D1 of display module LCD1602 and one end of pin header RP1. The output port P0.2 / AD2 of microcontroller U7 is connected to the input port D2 of display module LCD1602 and one end of pin header RP1. The output port P0.3 / AD3 of microcontroller U7 is connected to the input port D3 of display module LCD1602 and one end of pin header RP1. The output port P0.4 / AD4 of microcontroller U7 is connected to the input port D4 of display module LCD1602 and one end of pin header RP1. The output port P0.5 / AD5 of microcontroller U7 is connected to the input port D5 of display module LCD1602 and one end of pin header RP1. The output port P0.6 / AD6 of microcontroller U7 is connected to the input port D6 of display module LCD1602 and one end of pin header RP1. The output port P0.7 / AD7 of microcontroller U7 is connected to the input port D7 of display module LCD1602 and one end of pin header RP1. One end of pin header RP1 is connected to the +5V power supply. The input port VBB of display module LCD1602 is connected to the input port VEE of display module LCD1602 and the ground wire. The input port VDD of display module LCD1602 is connected to the +5V power supply. The input port RS of display module LCD1602 is connected to the output P2.4 / A12 of microcontroller U7. The input port RW of display module LCD1602 is connected to the output P2.5 / A13 of microcontroller U7. The input port E of display module LCD1602 is connected to the output P2.6 / A14 of microcontroller U7. The output port P2. of microcontroller U70 / A8 is connected to the input port 1B of the motor drive module U8. The output port P2.1 / A9 of the single-chip microcomputer U7 is connected to the input port 2B of the motor drive module U8. The output port P2.2 / A10 of the single-chip microcomputer U7 is connected to the input port 3B of the motor drive module U8. The output port P2.3 / A11 of the single-chip microcomputer U7 is connected to the input port 4B of the motor drive module U8. Denote the output ports 1C, 2C, 3C, and 4C of the motor drive module U8 as U8_OUT1, U8_OUT2, U8_OUT3, and U8_OUT4 respectively, and connect them to the input ends of the four coils inside the motor 88 in the position control module (8). The input port of the motor drive module U8 is connected to one end of the capacitor C12 and the ground wire, and the output port COM of the motor drive module U8 is connected to the other end of the capacitor C12 and the +12V power supply;. The position control module (8) includes a first mounting plate (81), a second mounting plate (82), a third mounting plate (83), a first base (84), a second base (85), a third base (86), a slide rail (87), a motor (88), a gear (89), and a rack (80). The first mounting plate (81) is fixed on the first base (84). The second mounting plate (82) is fixed on the second base (85). The third mounting plate (83) is fixed on the third base (86). The three mounting plates are of the same size and their bottom edges are on the same horizontal line. The first base (84) and the third base (86) are connected by two identical slide rails. There are reserved holes on the second base (85) so that the second base (85) can slide freely on the slide rail (87). The rack (89) is of the same length as the slide rail (87) and is installed directly below the slide rail (87). The motor (88) is a four-phase stepper motor, and its transmission mechanism is connected to the rack (80) through the gear (89).

2. The collaborative control circuit system of a wireless charging relay coil and a transmitting end according to claim 1, wherein The described boost - buck module (3) includes a duty - cycle adjustment circuit and a boost - buck circuit. The structure of the duty - cycle adjustment circuit is as follows: One end of resistor R11 is connected to the inverting input terminal of operational amplifier U5 and one end of capacitor C5. The other end of resistor R11 is connected to the negative electrode of diode D7 and the positive electrode of diode D6. The other end of capacitor C5 is connected to one end of resistor R15 and the ground wire. The other end of resistor R15 is connected to the non - inverting input terminal of operational amplifier U5 and one end of resistor R14. The positive electrode of diode D7 is connected to the upper end of potentiometer R12. The negative electrode of diode D6 is connected to the lower end of potentiometer R12. The output terminal of operational amplifier U5 is connected to one end of resistor R13. The other end of resistor R13 is connected to the sliding - contact terminal of potentiometer R12, the other end of R14, and one end of bidirectional voltage - regulating diode D8 to serve as an output terminal, which is denoted as CP_OUT3. The other end of bidirectional voltage - regulating diode D8 is connected to the ground wire. The structure of the boost - buck circuit is as follows: The collector of transistor Q7 is connected to DC input VPP. The base input CP_IN3 of transistor Q7 is connected to the output terminal CP_OUT3. The emitter of transistor Q7 is connected to one end of inductor L4 and the negative electrode of diode D5. The positive electrode of diode D5 is connected to the negative electrode of electrolytic capacitor C6 and one end of resistor R16 to serve as an output terminal, which is denoted as output terminal VDD1_OUT. The other end of inductor L4 is connected to the positive electrode of electrolytic capacitor C6, the other end of resistor R16, and the ground wire to serve as an output terminal, which is denoted as output terminal VDD2_OUT.

3. The collaborative control circuit system of a wireless charging relay coil and a transmitting end according to claim 1, wherein The structure of the described transmitting - coil module (4) is as follows: The drain of field - effect transistor Q3 is connected to the drain of field - effect transistor Q4, which is denoted as input terminal VDD2_IN. Input terminal VDD2_IN is connected to output terminal VDD2_OUT in the boost - buck module (3). The gates of field - effect transistor Q3 and field - effect transistor Q6 are denoted as input terminal CP_IN1. Input terminal CP_IN1 is connected to output terminal CP_OUT1 in the timing - generation module (2). The gates of field - effect transistor Q4 and field - effect transistor Q5 are denoted as input terminal CP_IN2. Input terminal CP_IN2 is connected to output terminal CP_OUT2 in the timing - generation module (2). The source of field - effect transistor Q3 is connected to the drain of field - effect transistor Q5 and one end of capacitor C1. The source of field - effect transistor Q4 is connected to the drain of field - effect transistor Q6 and one end of resistor R1. The other end of inductor C1 is connected to the corresponding terminal of transmitting coil L1. The other end of resistor R1 is connected to the other end of transmitting coil L1. The sources of field - effect transistor Q5 and field - effect transistor Q6 are connected together, which is denoted as input terminal VDD1_IN. Input terminal VDD1_IN is connected to output terminal VDD1_OUT in the boost - buck module (3). Transmitting coil L1 is fixed on the first mounting plate 81 of the position - control module (8).

4. The collaborative control circuit system of a wireless charging relay coil and a transmitting end according to claim 1, wherein The structure of the relay coil module (5) is as follows: One end of the capacitor C2 is connected to the same-named end of the relay coil L2, the other end of the capacitor C2 is connected to one end of the resistor R2, the other end of the relay coil L2 is connected to the other end of the resistor R2, and the relay coil L2 is fixed on the second mounting plate 82 of the position control module (8).

5. The collaborative control circuit system of a wireless charging relay coil and a transmitting end according to claim 1, wherein The structure of the receiving coil module (6) is as follows: One end of the capacitor C3 is connected to the same-named end of the receiving coil L3, the other end of the receiving coil L3 is connected to one end of the resistor R3, the other end of the capacitor C3 is connected to the positive electrode of the diode D1 and the negative electrode of the diode D3, the other end of the resistor R3 is connected to the positive electrode of the diode D2 and the negative electrode of the diode D4, the negative electrode of the diode D1 is connected to the negative electrodes of the diode D2, the positive electrode of the electrolytic capacitor C7, one end of the capacitor C8, and port 1 of the DC output P1, the positive electrode of the diode D3 is connected to the positive electrodes of the diode D4, the negative electrode of the electrolytic capacitor C7, the other end of the capacitor C8, one end of the resistor R18, and one end of the resistor R20, port 2 of the DC output P1 is connected to the other end of the resistor R18 and one end of the resistor R19, the other end of the resistor R19 is connected to one end of the resistor R21 and the non-inverting input terminal of the operational amplifier U4, the other end of the resistor R21 is connected to the ground wire, the other end of the resistor R20 is connected to the inverting input terminal of the operational amplifier U4 and one end of R22, the positive power supply terminal of the operational amplifier U4 is connected to the +12V power supply, the negative power supply terminal of the operational amplifier U4 is connected to the ground wire, the output terminal of the operational amplifier U4 is connected to the other end of the resistor R22 as the output port, and this port is denoted as output port A1_OUT. The receiving coil L3 is fixed on the third mounting plate 83 of the position control module (8).

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