A bidirectional wireless charging method and system based on full-duplex energy-carrying communication

Abstract

The application discloses a kind of based on full duplex energy-carrying communication two-way wireless charging method and system, it is related to full duplex energy-carrying communication technical field, the method includes: primary side controller sends the first clock signal randomly generated to secondary side controller;Secondary side controller demodulates first clock signal, generates second clock signal, and sends second clock signal to primary side controller;Primary side controller demodulates second clock signal, generates third clock signal;Primary side controller calculates the phase difference between first clock signal and third clock signal, and generates the fourth clock signal same as the phase of second clock signal according to phase difference.The method is by using full duplex energy-carrying communication technology, establishes accurate synchronous pulse signal between the two controllers of primary side and secondary side, reaches the purpose of accurately controlling energy two-way flow.

Description

Technical Field

[0001] This invention relates to the field of full-duplex power-carrying communication technology, and in particular to a bidirectional wireless charging method and system based on full-duplex power-carrying communication. Background Technology

[0002] With the rise of the concept of energy interconnection and the increasing demand for portability and seamless connectivity, wireless charging systems have gradually become a research hotspot in the field of modern electrical and electronic equipment. However, traditional wireless charging systems suffer from the problem of unidirectional charging, meaning they can only supply power from the power source to the device, lacking the ability for interaction between the device and the power source. To address this, bidirectional wireless charging systems have emerged. This technology enables electric vehicles and other devices to transfer energy with the power grid, achieving energy sharing. This not only improves charging efficiency and reliability but also provides more possibilities for the promotion and application of this technology.

[0003] To control the direction of energy flow in a bidirectional wireless charging system, several control methods are used: One method involves two controllers at the power supply and load sides alternately operating in inverter and rectification states to achieve bidirectional energy flow. This method is relatively simple to implement, but its efficiency drops significantly when the load varies considerably, and it is generally not used. Another method involves adding an auxiliary coil to the load side to convert the detected alternating signal into a drive pulse signal for the load-side controller. However, the pulse synchronization signal detected by this method is highly sensitive to the parameters of the wireless charging system's compensation network. Under conditions such as high temperature and offset, the pulse signals collected are not completely synchronized, requiring strict compensation. Therefore, incomplete synchronization of the pulse signals will significantly affect the information exchange and energy flow between the power supply and load sides. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional wireless charging method and system based on full-duplex energy-carrying communication. By utilizing full-duplex energy-carrying communication technology, a precise synchronization pulse signal is established between two controllers on the primary and secondary sides to achieve precise control of bidirectional energy flow.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] In a first aspect, the present invention provides a bidirectional wireless charging method based on full-duplex power-carrying communication, comprising:

[0007] The primary controller sends a randomly generated first clock signal to the secondary controller;

[0008] The secondary controller demodulates the first clock signal to generate a second clock signal, and sends the second clock signal to the primary controller.

[0009] The primary controller demodulates the second clock signal to generate a third clock signal;

[0010] The primary-side controller calculates the phase difference between the first clock signal and the third clock signal, and generates a fourth clock signal with the same phase as the second clock signal based on the phase difference;

[0011] The secondary-side controller delays the second clock signal to generate a fifth clock signal, and generates a secondary-side first PWM pulse signal based on the fifth clock signal;

[0012] The primary-side controller generates a primary-side first PWM pulse signal according to the fourth clock signal; the primary-side first PWM pulse signal and the secondary-side first PWM pulse signal are used to control the flow of energy from the primary side to the secondary side;

[0013] The primary-side controller delays the fourth clock signal to generate a sixth clock signal, and generates a primary-side second PWM pulse signal based on the sixth clock signal;

[0014] The secondary-side controller generates a secondary-side second PWM pulse signal based on the second clock signal; the primary-side second PWM pulse signal and the secondary-side second PWM pulse signal are used to control the flow of energy from the secondary side to the primary side.

[0015] Optionally, the secondary-side controller demodulates the first clock signal to generate a second clock signal, specifically including:

[0016] The modulation signal corresponding to the first clock signal is modulated to generate a first clock modulated signal;

[0017] The first clock modulus signal is filtered to generate the first envelope signal;

[0018] A second clock signal is generated based on the first envelope signal.

[0019] Optionally, the primary-side controller demodulates the second clock signal to generate a third clock signal, specifically including:

[0020] The modulated signal corresponding to the second clock signal is modulated to generate a second clock modulated signal;

[0021] The second clock modulus signal is filtered to generate the second envelope signal;

[0022] A third clock signal is generated based on the second envelope signal.

[0023] Optionally, a fourth clock signal with the same phase as the second clock signal is generated based on the phase difference, specifically including:

[0024] The phase of the first clock signal is delayed by half of the phase difference to generate the fourth clock signal.

[0025] Optionally, the secondary controller delays the second clock signal to generate a fifth clock signal, specifically including:

[0026] The phase of the second clock signal is delayed by 90° to generate the fifth clock signal.

[0027] Optionally, the primary-side controller delays the fourth clock signal to generate a sixth clock signal, specifically including:

[0028] The phase of the fourth clock signal is delayed by 90° to generate the sixth clock signal.

[0029] Secondly, the present invention provides a bidirectional wireless charging system based on full-duplex power-carrying communication, comprising: a primary-side controller and a secondary-side controller;

[0030] The primary-side controller is used for:

[0031] The randomly generated first clock signal is sent to the secondary side controller;

[0032] The second clock signal sent by the secondary controller is demodulated to generate a third clock signal;

[0033] Calculate the phase difference between the first clock signal and the third clock signal, and generate a fourth clock signal with the same phase as the second clock signal based on the phase difference;

[0034] A primary-side first PWM pulse signal is generated based on the fourth clock signal;

[0035] The fourth clock signal is delayed to generate a sixth clock signal, and a primary-side second PWM pulse signal is generated based on the sixth clock signal;

[0036] The secondary-side controller is used for:

[0037] The first clock signal sent by the primary side controller is demodulated to generate a second clock signal, and the second clock signal is sent to the primary side controller.

[0038] The second clock signal is delayed to generate a fifth clock signal, and a second-side first PWM pulse signal is generated based on the fifth clock signal;

[0039] The second PWM pulse signal on the secondary side is generated based on the second clock signal.

[0040] Optionally, the system further includes: a primary-side drive circuit, a primary-side full-bridge converter, a primary-side compensation network, a primary-side signal transmitting circuit, a primary-side signal receiving circuit, a secondary-side drive circuit, a secondary-side full-bridge converter, a secondary-side compensation network, a secondary-side signal transmitting circuit, a secondary-side signal receiving circuit, an energy transmission coil, a signal transmission coil, and a power supply;

[0041] The primary-side controller is connected to the signal transmission coil via the primary-side signal transmitting circuit and the primary-side signal receiving circuit; the primary-side drive circuit is connected to the primary-side controller; the primary-side full-bridge converter is connected to the primary-side drive circuit, the power supply, and the primary-side compensation network respectively; the primary-side compensation network is connected to the energy transmission coil.

[0042] The secondary-side controller is connected to the signal transmission coil via the secondary-side signal transmitting circuit and the secondary-side signal receiving circuit; the secondary-side drive circuit is connected to the secondary-side controller; the secondary-side full-bridge converter is connected to the secondary-side drive circuit, the power supply, and the secondary-side compensation network respectively; the secondary-side compensation network is connected to the energy transmission coil.

[0043] Optionally, the primary-side controller specifically includes: a primary-side digital signal modulation module, a primary-side digital signal demodulation and bit synchronization module, and a primary-side PWM pulse generation module; the primary-side digital signal modulation module includes: a primary-side selection switch, a primary-side first crystal oscillator, a primary-side sine wave generator, and a primary-side tri-state gate circuit; the primary-side digital signal demodulation and bit synchronization module includes: a primary-side rectifier circuit, a primary-side FIR filter, a primary-side bit synchronization circuit, a primary-side phase detector, a primary-side microcontroller, a primary-side frequency divider, a primary-side clock conversion circuit, and a primary-side second crystal oscillator; the primary-side PWM pulse generation module includes: a primary-side phase detection delay circuit, a primary-side delay circuit, and a primary-side dead-time circuit;

[0044] The primary-side sine wave generator is connected to the primary-side first crystal oscillator; the primary-side tri-state gate circuit is connected to the primary-side selection switch and the primary-side sine wave generator respectively;

[0045] The primary-side FIR filter is connected to the primary-side rectifier circuit; the primary-side position synchronization circuit is connected to the primary-side FIR filter; the primary-side phase detector is connected to both the primary-side FIR filter and the primary-side frequency divider; the primary-side microcontroller is connected to both the primary-side phase detector and the primary-side clock conversion circuit; the primary-side frequency divider is connected to the primary-side microcontroller; and the primary-side clock conversion circuit is connected to the primary-side second crystal oscillator.

[0046] The primary-side delay circuit is connected to the primary-side phase detection delay circuit; the primary-side dead-time circuit is connected to the primary-side delay circuit.

[0047] Optionally, the secondary-side controller specifically includes: a secondary-side digital signal modulation module, a secondary-side digital signal demodulation and bit synchronization module, and a secondary-side PWM pulse generation module; the secondary-side digital signal modulation module includes: a secondary-side selection switch, a secondary-side first crystal oscillator, a secondary-side sine wave generator, and a secondary-side tri-state gate circuit; the secondary-side digital signal demodulation and bit synchronization module includes: a secondary-side rectifier circuit, a secondary-side FIR filter, a secondary-side bit synchronization circuit, a secondary-side phase detector, a secondary-side microcontroller, a secondary-side frequency divider, a secondary-side clock conversion circuit, and a secondary-side second crystal oscillator; the secondary-side PWM pulse generation module includes: a secondary-side delay circuit and a secondary-side dead-time circuit;

[0048] The secondary-side sine wave generator is connected to the secondary-side first crystal oscillator; the secondary-side tri-state gate circuit is connected to the secondary-side selection switch and the secondary-side sine wave generator respectively;

[0049] The secondary-side FIR filter is connected to the secondary-side rectifier circuit; the secondary-side position synchronization circuit is connected to the secondary-side FIR filter; the secondary-side phase detector is connected to both the secondary-side FIR filter and the secondary-side frequency divider; the secondary-side microcontroller is connected to both the secondary-side phase detector and the secondary-side clock conversion circuit; the secondary-side frequency divider is connected to the secondary-side microcontroller; and the secondary-side clock conversion circuit is connected to the secondary-side second crystal oscillator.

[0050] The secondary dead zone circuit is connected to the secondary delay circuit.

[0051] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0052] This invention provides a bidirectional wireless charging method and system based on full-duplex power-carrying communication. To achieve precise control of energy flow in the bidirectional wireless charging system, this method combines a full-duplex power-carrying communication system with bidirectional wireless charging control. Through modulation and demodulation of signals between the primary and secondary sides, the primary-side controller generates two clock signals: a first clock signal and a third clock signal. The secondary-side controller generates a second clock signal. To synchronize the clock signals between the primary and secondary sides, the primary-side controller calculates the phase difference between the first and third clock signals and uses this phase difference to generate a fourth clock signal with the same phase as the second clock signal. Because the fourth clock signal on the primary side and the second clock signal on the secondary side have the same phase, the system can achieve complete synchronization of pulse signals and precisely control the bidirectional flow of energy. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a flowchart of a bidirectional wireless charging method based on full-duplex power-carrying communication according to the present invention;

[0055] Figure 2 This is a schematic diagram of the module structure of a bidirectional wireless charging system based on full-duplex power-carrying communication according to the present invention.

[0056] Figure 3 This is a magnetic coupling mechanism diagram of the energy transmission coil and signal transmission coil of a bidirectional wireless charging system based on full-duplex energy-carrying communication according to the present invention.

[0057] Figure 4 This is a diagram showing the internal structure of the primary-side controller of a bidirectional wireless charging system based on full-duplex power-carrying communication according to the present invention.

[0058] Figure 5 This is a diagram showing the internal structure of the secondary controller of a bidirectional wireless charging system based on full-duplex power-carrying communication according to the present invention.

[0059] Figure 6 This is a schematic diagram illustrating the working principle of a bidirectional wireless charging system based on full-duplex power-carrying communication according to the present invention.

[0060] Figure 7 This is a pulse timing diagram of a bidirectional wireless charging method based on full-duplex power-carrying communication according to the present invention.

[0061] Symbol explanation:

[0062] Primary shielding layer 11, primary energy transmission coil 12, primary signal transmission coil 13, secondary shielding layer 21, secondary energy transmission coil 22, secondary signal transmission coil 23, primary digital signal modulation module 14, primary digital signal demodulation and bit synchronization module 15, primary PWM pulse generation module 16, secondary digital signal modulation module 24, secondary digital signal demodulation and bit synchronization module 25, secondary PWM pulse generation module 26. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] The purpose of this invention is to provide a bidirectional wireless charging method and system based on full-duplex energy-carrying communication. By utilizing full-duplex energy-carrying communication technology, a precise synchronization pulse signal is established between two controllers on the primary and secondary sides to achieve precise control of bidirectional energy flow.

[0065] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0066] Example 1

[0067] This embodiment provides a bidirectional wireless charging method based on full-duplex power-carrying communication, such as... Figure 1 As shown, the method specifically includes the following steps:

[0068] Step 101: The primary controller sends a randomly generated first clock signal to the secondary controller. Specifically, the primary controller generates a random first clock signal CLK1 based on the externally input Transistor-Transistor Logic (TTL) level signal, and sends the binary bit stream corresponding to the first clock signal CLK1 to the secondary controller via the wireless communication channel.

[0069] Step 102: The secondary controller demodulates the first clock signal to generate a second clock signal and sends the second clock signal to the primary controller. Specifically, after receiving the signal from the primary controller, the secondary controller modulates the modulation signal corresponding to the first clock signal CLK1 to generate a first clock modulated signal. Simultaneously, it filters the first clock modulated signal to generate a first envelope signal. Finally, the secondary controller obtains a second clock signal CLK2 from the first envelope signal, which has the same baud rate as the binary bit stream. The secondary controller then remodulates the second clock signal CLK2 and sends it to the primary controller via the wireless communication channel.

[0070] Step 103: The primary-side controller demodulates the second clock signal to generate the third clock signal. Specifically, after receiving the signal from the secondary-side controller, the primary-side controller modulates the modulation signal corresponding to the second clock signal CLK2 to generate a second clock modulated signal. Simultaneously, it filters the second clock modulated signal to generate a second envelope signal. Finally, the primary-side controller obtains the third clock signal CLK3 from the second envelope signal.

[0071] Step 104: The primary-side controller calculates the phase difference between the first clock signal and the third clock signal, and generates a fourth clock signal with the same phase as the second clock signal based on the phase difference. During wireless communication transmission, the primary-side and secondary-side clock signals will have a certain phase difference, resulting in asynchrony between them. To synchronize the clock signals, the primary-side controller calculates the phase difference between the first clock signal CLK1 and the third clock signal CLK3, and delays the phase of the first clock signal CLK1 by half of this phase difference to generate the fourth clock signal CLK4. The delayed fourth clock signal CLK4 has the same phase as the second clock signal CLK2, thus achieving synchronization between the primary-side and secondary-side clock signals.

[0072] Step 105: The secondary controller delays the second clock signal to generate a fifth clock signal, and generates a secondary first PWM pulse signal based on the fifth clock signal. After steps 101 to 104, the primary and secondary clock signals are synchronized. To achieve energy flow between the primary and secondary sides, different PWM pulse signals need to be generated using the primary and secondary clock signals to drive the energy flow.

[0073] Step 106: The primary-side controller generates a primary-side first PWM pulse signal based on the fourth clock signal. Since the phase of the fifth clock signal CLK5 lags behind the phase of the fourth clock signal CLK4 by 90°, the primary-side first PWM pulse signal controlling energy flow is issued with the fourth clock signal CLK4 as the reference, and the secondary-side first PWM pulse signal controlling energy flow is issued with the fifth clock signal CLK5 as the clock reference. This results in the secondary-side first PWM pulse signal lagging behind the primary-side first PWM pulse signal by 90° overall, allowing energy from wireless charging to flow from the primary side to the secondary side.

[0074] Step 107: The primary side controller delays the fourth clock signal to generate the sixth clock signal, and generates the primary side second PWM pulse signal based on the sixth clock signal.

[0075] Step 108: The secondary-side controller generates a secondary-side second PWM pulse signal based on the second clock signal. Since the phase of the sixth clock signal CLK6 lags behind the phase of the second clock signal CLK2 by 90°, a primary-side second PWM pulse signal controlling energy flow is issued based on the sixth clock signal, and a secondary-side second PWM pulse signal controlling energy flow is issued based on the second clock signal. This results in the primary-side second PWM pulse signal lagging behind the secondary-side second PWM pulse signal by 90° overall, allowing energy from wireless charging to flow from the secondary side to the primary side.

[0076] Example 2

[0077] This embodiment provides a bidirectional wireless charging system based on full-duplex power-carrying communication, such as... Figure 2 As shown, the system includes a primary-side controller and a secondary-side controller.

[0078] The primary-side controller and the secondary-side controller are both model number FPGA-XC6SLX16.

[0079] A primary-side controller is configured to: send a randomly generated first clock signal CLK1 to a secondary-side controller; demodulate a second clock signal CLK2 sent by the secondary-side controller to generate a third clock signal CLK3; calculate the phase difference between the first clock signal CLK1 and the third clock signal CLK3, and generate a fourth clock signal CLK4 with the same phase as the second clock signal CLK2 based on the phase difference; generate a primary-side first PWM pulse signal based on the fourth clock signal CLK4; delay the fourth clock signal CLK4 to generate a sixth clock signal CLK6, and generate a primary-side second PWM pulse signal based on the sixth clock signal CLK6.

[0080] The secondary controller is configured to: demodulate the first clock signal CLK1 sent by the primary controller to generate a second clock signal CLK2, and send the second clock signal CLK2 to the primary controller; delay the second clock signal CLK2 to generate a fifth clock signal CLK5, and generate a secondary first PWM pulse signal based on the fifth clock signal CLK5; and generate a secondary second PWM pulse signal based on the second clock signal CLK2.

[0081] In addition, the system also includes: a primary-side drive circuit, a primary-side full-bridge converter, a primary-side compensation network, a primary-side signal transmitting circuit, a primary-side signal receiving circuit, a secondary-side drive circuit, a secondary-side full-bridge converter, a secondary-side compensation network, a secondary-side signal transmitting and receiving circuit, an energy transmission coil, a signal transmission coil, and a power supply. Specifically, the primary-side controller is connected to the signal transmission coil through the primary-side signal transmitting circuit and the primary-side signal receiving circuit; the primary-side drive circuit is connected to the primary-side controller; the primary-side full-bridge converter is connected to the primary-side drive circuit, the power supply, and the primary-side compensation network respectively; the primary-side compensation network is connected to the energy transmission coil; the secondary-side controller is connected to the signal transmission coil through the secondary-side signal transmitting circuit and the secondary-side signal receiving circuit; the secondary-side drive circuit is connected to the secondary-side controller; the secondary-side full-bridge converter is connected to the secondary-side drive circuit, the power supply, and the secondary-side compensation network respectively; and the secondary-side compensation network is connected to the energy transmission coil.

[0082] The primary and secondary drive circuits receive PWM signals from the controller and amplify the power, providing sufficient drive capability for the switching devices of the corresponding full-bridge converter. For the primary and secondary full-bridge converters: when energy flows in the forward direction, the primary full-bridge converter operates in inverter mode, converting DC to AC from the power supply. Simultaneously, the secondary full-bridge converter operates in active rectification mode, converting the received AC to DC to charge the battery. When energy flows in the reverse direction, the secondary full-bridge converter operates in inverter mode, converting DC to AC from the battery terminals. Simultaneously, the primary full-bridge converter operates in active rectification mode, converting the received AC to DC to feed back to the power supply.

[0083] Furthermore, such as Figure 3As shown, the energy transmission coil in this system includes a primary-side energy transmission coil 12 and a secondary-side energy transmission coil 22; the signal transmission coil includes a primary-side signal transmission coil 13 and a secondary-side signal transmission coil 23. The primary-side energy transmission coil 12 and the secondary-side energy transmission coil 22 are two DD-type coils, enabling wireless energy transmission; the primary-side signal transmission coil 13 and the secondary-side signal transmission coil 23 are two square-type coils, enabling wireless signal transmission. A primary-side shielding layer 11 and a secondary-side shielding layer 21 are placed on the outside of the two DD-type coils, respectively. Because the DD-type coil and the square-type coil are decoupled, their magnetic fields do not interfere with each other, so the bidirectional wireless charging system and the full-duplex wireless communication system do not interfere with each other. The primary-side compensation network and the primary-side energy transmission coil 12 form a resonant circuit, minimizing reactive power in the primary-side circuit; the secondary-side compensation network and the secondary-side energy transmission coil 22 form a resonant circuit, minimizing reactive power in the secondary-side circuit.

[0084] The primary and secondary signal transmitting circuits are mainly used to perform digital-to-analog conversion and power amplification on the signals sent by the controller, providing energy for the wireless communication driving the signal transmission coil. The primary and secondary signal receiving circuits are mainly used to acquire the wireless communication waveform received by the signal transmission coil, and after bandpass filtering and analog-to-digital conversion sampling, transmit it to the controller for demodulation.

[0085] Furthermore, such as Figure 4As shown, the primary-side controller specifically includes: a primary-side digital signal modulation module 14, a primary-side digital signal demodulation and bit synchronization module 15, and a primary-side PWM pulse generation module 16. The primary-side digital signal modulation module 14 includes: a primary-side selection switch, a primary-side first crystal oscillator, a primary-side sine wave generator, and a primary-side tri-state gate circuit. The primary-side digital signal demodulation and bit synchronization module 15 includes: a primary-side rectifier circuit, a primary-side finite impulse response (FIR) filter, a primary-side bit synchronization circuit, a primary-side phase detector, a primary-side microcontroller, a primary-side frequency divider, a primary-side clock conversion circuit, and a primary-side second crystal oscillator. The primary-side PWM pulse generation module 16 includes: a primary-side phase detection delay circuit, a primary-side delay circuit, and a primary-side dead-time circuit. The primary-side sine wave generator is connected to the primary-side first crystal oscillator; the primary-side tri-state gate circuit is connected to the primary-side selection switch and the primary-side sine wave generator respectively; the primary-side FIR filter is connected to the primary-side rectifier circuit; the primary-side position synchronization circuit is connected to the primary-side FIR filter; the primary-side phase detector is connected to the primary-side FIR filter and the primary-side frequency divider respectively; the primary-side microcontroller is connected to the primary-side phase detector and the primary-side clock conversion circuit respectively; the primary-side frequency divider is connected to the primary-side microcontroller; the primary-side clock conversion circuit is connected to the primary-side second crystal oscillator; the primary-side delay circuit is connected to the primary-side phase detection delay circuit; and the primary-side dead-time circuit is connected to the primary-side delay circuit.

[0086] In the primary-side digital signal modulation module 14: using an externally input TTL level signal as a binary bit stream and a first clock signal CLK1, a primary-side selection switch selects the binary bit stream as the baseband signal to be modulated. The primary-side first crystal oscillator generates a local 50MHz clock and sends it to the primary-side sine wave generator. The primary-side sine wave generator generates a frequency of f. sp A first-order sinusoidal signal, satisfying ω sp 2 =(2πf sp ) 2 =1 / (L) sp C sp In the formula, ω sp f is the angular frequency of the primary sinusoidal signal. sp L is the frequency of the primary sinusoidal signal. sp For primary side signal transmission coil 13, C spThis is a primary-side compensation capacitor. Finally, the primary-side tri-state gate circuit converts the baseband signal to be modulated into a digital modulation signal and outputs it. In the primary-side digital signal demodulation and bit synchronization module 15: the primary-side rectifier circuit takes the modulus of the input modulation signal and then low-pass filters it through the primary-side FIR filter to obtain the first envelope signal. At the same time, the primary-side second crystal oscillator generates a local 50MHz clock, which is sent to the primary-side microcontroller through the primary-side clock conversion circuit. The primary-side phase detector, the primary-side microcontroller, and the primary-side frequency divider form a local closed-loop feedback system to obtain the third clock signal CLK3 from the first envelope signal. The first envelope signal and the third clock signal CLK3 will generate a digital demodulated signal in the primary-side bit synchronization circuit. In the primary-side PWM pulse generation module 16: the primary-side phase detection delay circuit detects the phase difference between the first clock signal CLK1 and the third clock signal CLK3, and delays the first clock signal CLK1 to obtain the fourth clock signal CLK4. The fourth clock signal CLK4 passes through the primary-side delay circuit to obtain the sixth clock signal CLK6 and sends it to the primary-side dead-time circuit. The primary-side dead-time circuit will output the PWM pulse signal that controls the primary-side full-bridge converter.

[0087] like Figure 5 As shown, the secondary-side controller specifically includes: a secondary-side digital signal modulation module 24, a secondary-side digital signal demodulation and bit synchronization module 25, and a secondary-side PWM pulse generation module 26. The secondary-side digital signal modulation module 24 includes: a secondary-side selection switch, a secondary-side first crystal oscillator, a secondary-side sine wave generator, and a secondary-side tri-state gate circuit. The secondary-side digital signal demodulation and bit synchronization module 25 includes: a secondary-side rectifier circuit, a secondary-side FIR filter, a secondary-side bit synchronization circuit, a secondary-side phase detector, a secondary-side microcontroller, a secondary-side frequency divider, a secondary-side clock conversion circuit, and a secondary-side second crystal oscillator. The secondary-side PWM pulse generation module 26 includes: a secondary-side delay circuit and a secondary-side dead-time circuit. The secondary-side sine wave generator is connected to the secondary-side first crystal oscillator; the secondary-side tri-state gate circuit is connected to the secondary-side selection switch and the secondary-side sine wave generator respectively; the secondary-side FIR filter is connected to the secondary-side rectifier circuit; the secondary-side position synchronization circuit is connected to the secondary-side FIR filter; the secondary-side phase detector is connected to the secondary-side FIR filter and the secondary-side frequency divider respectively; the secondary-side microcontroller is connected to the secondary-side phase detector and the secondary-side clock conversion circuit respectively; the secondary-side frequency divider is connected to the secondary-side microcontroller; the secondary-side clock conversion circuit is connected to the secondary-side second crystal oscillator; and the secondary-side dead-time circuit is connected to the secondary-side delay circuit.

[0088] In the secondary-side digital signal modulation module 24: the secondary-side selection switch selects the binary bit stream corresponding to the received first clock signal CLK1 as the baseband signal to be modulated; the secondary-side first crystal oscillator generates a local 50MHz clock and sends it to the secondary-side sine wave generator; the secondary-side sine wave generator generates a frequency of f. ss The second-order sinusoidal signal, and satisfying ω ss 2 =(2πf ss ) 2 =1 / (L) ss C ss In the formula, ω ss f is the angular frequency of the secondary sinusoidal signal. ss L is the frequency of the secondary sinusoidal signal. ss For secondary side signal transmission coil 23, C ss This is a secondary-side compensation capacitor. Finally, the secondary-side tri-state gate circuit converts the baseband signal to be modulated into a digital modulation signal and outputs it. In the secondary-side digital signal demodulation and bit synchronization module 25: the secondary-side rectifier circuit takes the modulus of the input modulation signal and then passes it through a secondary-side FIR filter for low-pass filtering to obtain the second envelope signal. At the same time, the secondary-side second crystal oscillator generates a local 50MHz clock, which is sent to the secondary-side microcontroller through the secondary-side clock conversion circuit. The secondary-side phase detector, the secondary-side microcontroller, and the secondary-side frequency divider form a local closed-loop feedback system, from which the second clock signal CLK2 is obtained. The second envelope signal and the second clock signal CLK2 will generate a digital demodulated signal in the secondary-side bit synchronization circuit. In the secondary-side PWM pulse generation module 26: the second clock signal CLK2 passes through the secondary-side delay circuit to obtain the fifth clock signal CLK5, which is then sent to the secondary-side dead-time circuit. The secondary-side dead-time circuit will output the PWM pulse signal that controls the secondary-side full-bridge converter.

[0089] Example 3

[0090] This embodiment provides a working principle for a bidirectional wireless charging system based on full-duplex power-carrying communication, such as... Figure 6 As shown, the specific working principle is as follows:

[0091] First, the primary-side controller sends a modulated digital signal, which is converted into an analog signal by the primary-side digital-to-analog converter circuit. After the analog signal voltage is amplified by the primary-side power amplifier, it is injected into L. sp C sp and R sp The circuit consists of [variable name]. The secondary side R [variable name]. ssThe signal transmitted from the primary side is acquired and sent to the secondary side bandpass filter. The secondary side bandpass filter allows the primary side signal to pass through effectively while attenuating the secondary side signal by -40dB. The secondary side analog-to-digital sampling circuit acquires the output signal of the secondary side bandpass filter and sends the converted digital signal to the secondary side controller. This completes the transmission process from the primary side signal to the secondary side signal.

[0092] Similarly, the secondary-side controller sends a modulated digital signal, which is converted into an analog signal by the secondary-side digital-to-analog converter circuit. After the analog signal voltage is amplified by the secondary-side power amplifier, it is injected into L. ss C ss and R ss The circuit consists of [variable name]. The primary side R [variable name]. sp The signal transmitted from the secondary side is acquired and sent to the primary side bandpass filter. The primary side bandpass filter allows the signal transmitted from the secondary side to pass through effectively, while attenuating the signal transmitted from the primary side by -40dB. The primary side analog-to-digital sampling circuit acquires the output signal of the primary side bandpass filter and sends the acquired and converted digital signal to the primary side controller. This completes the transmission process from the secondary side signal to the primary side signal.

[0093] Among them, L sp The primary signal transmission coil 13 is responsible for wireless signal transmission and reception; C sp This is a primary-side compensation capacitor, which adjusts the primary-side circuit to a resonant state, facilitating the transmission and reception of wireless signals; R sp This is the primary-side sampling resistor, which sends the acquired signal to the primary-side bandpass filter; L ss The secondary signal transmission coil 23 is responsible for wireless signal transmission and reception; C ss This is a secondary-side compensation capacitor, which adjusts the secondary-side circuit to a resonant state, facilitating the transmission and reception of wireless signals; R ss This is the secondary sampling resistor, which can send the acquired signal to the bandpass filter.

[0094] like Figure 7 As shown, because the circuit structure of the bidirectional wireless charging system based on full-duplex power-carrying communication provided by this invention is symmetrical, the phase difference between the first clock signal CLK1 and the second clock signal CLK2 is... The phase difference between the second clock signal CLK2 and the third clock signal CLK3 They are equal. Furthermore, compared to the delay time of the communication signal in the coil, this invention uses an FPGA-XC6SLX16 as the controller, assuming that its internal modulation and demodulation of the signal is instantaneous, and the delay time of the signal due to the execution of the internal software algorithm can be ignored. Therefore, the phase difference between the first clock signal CLK1 and the third clock signal CLK3 is... Satisfy the following formula:

[0095]

[0096] At this point, the primary-side controller has two clock signals, CLK1 and CLK3, while the secondary-side controller has one clock signal, CLK2. Next, a software algorithm is used in the primary-side controller to detect the phase difference between the first clock signal CLK1 and the third clock signal CLK3. Delay the phase of the first clock signal CLK1 The fourth clock signal CLK4 is then obtained. Based on the above analysis, the phase difference between the fourth clock signal CLK4 and the first clock signal CLK1 is... The phase difference between the second clock signal CLK2 and the first clock signal CLK1 is also Therefore, the primary-side controller and the secondary-side controller respectively obtain the fourth clock signal CLK4 and the second clock signal CLK2, which are of the same phase. Furthermore, the acquisition of these two synchronous clock signals, CLK2 and CLK4, is independent of... The specific size of the pulse signal is determined. Therefore, the system can achieve complete synchronization of the pulse signal and precisely control the bidirectional flow of energy.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0098] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bidirectional wireless charging method based on full-duplex power-carrying communication, characterized in that, include: The primary controller sends a randomly generated first clock signal to the secondary controller; The secondary controller demodulates the first clock signal to generate a second clock signal, and sends the second clock signal to the primary controller. The primary controller demodulates the second clock signal to generate a third clock signal; The primary-side controller calculates the phase difference between the first clock signal and the third clock signal, and generates a fourth clock signal with the same phase as the second clock signal based on the phase difference; The secondary-side controller delays the second clock signal to generate a fifth clock signal, and generates a secondary-side first PWM pulse signal based on the fifth clock signal; The primary-side controller generates a primary-side first PWM pulse signal according to the fourth clock signal; the primary-side first PWM pulse signal and the secondary-side first PWM pulse signal are used to control the flow of energy from the primary side to the secondary side; The primary-side controller delays the fourth clock signal to generate a sixth clock signal, and generates a primary-side second PWM pulse signal based on the sixth clock signal; The secondary-side controller generates a secondary-side second PWM pulse signal based on the second clock signal; The primary side second PWM pulse signal and the secondary side second PWM pulse signal are used to control the flow of energy from the secondary side to the primary side.

2. The bidirectional wireless charging method based on full-duplex power-carrying communication according to claim 1, characterized in that, The secondary controller demodulates the first clock signal to generate a second clock signal, specifically including: The modulation signal corresponding to the first clock signal is modulated to generate a first clock modulated signal; The first clock modulus signal is filtered to generate the first envelope signal; A second clock signal is generated based on the first envelope signal.

3. The bidirectional wireless charging method based on full-duplex power-carrying communication according to claim 1, characterized in that, The primary controller demodulates the second clock signal to generate a third clock signal, specifically including: The modulated signal corresponding to the second clock signal is modulated to generate a second clock modulated signal; The second clock modulus signal is filtered to generate the second envelope signal; A third clock signal is generated based on the second envelope signal.

4. The bidirectional wireless charging method based on full-duplex power-carrying communication according to claim 1, characterized in that, Generating a fourth clock signal with the same phase as the second clock signal based on the phase difference specifically includes: The phase of the first clock signal is delayed by half of the phase difference to generate the fourth clock signal.

5. A bidirectional wireless charging method based on full-duplex power-carrying communication according to claim 1, characterized in that, The secondary controller delays the second clock signal to generate a fifth clock signal, specifically including: The phase of the second clock signal is delayed by 90° to generate the fifth clock signal.

6. The bidirectional wireless charging method based on full-duplex power-carrying communication according to claim 1, characterized in that, The primary controller delays the fourth clock signal to generate a sixth clock signal, specifically including: The phase of the fourth clock signal is delayed by 90° to generate the sixth clock signal.

7. A bidirectional wireless charging system based on full-duplex power-carrying communication, characterized in that, The system includes: a primary-side controller and a secondary-side controller; The primary-side controller is used for: The randomly generated first clock signal is sent to the secondary side controller; The second clock signal sent by the secondary controller is demodulated to generate a third clock signal; Calculate the phase difference between the first clock signal and the third clock signal, and generate a fourth clock signal with the same phase as the second clock signal based on the phase difference; A primary-side first PWM pulse signal is generated based on the fourth clock signal; The fourth clock signal is delayed to generate a sixth clock signal, and a primary-side second PWM pulse signal is generated based on the sixth clock signal; The secondary-side controller is used for: The first clock signal sent by the primary side controller is demodulated to generate a second clock signal, and the second clock signal is sent to the primary side controller. The second clock signal is delayed to generate a fifth clock signal, and a second-side first PWM pulse signal is generated based on the fifth clock signal; The second PWM pulse signal on the secondary side is generated based on the second clock signal.

8. A bidirectional wireless charging system based on full-duplex power-carrying communication according to claim 7, characterized in that, The system further includes: a primary-side drive circuit, a primary-side full-bridge converter, a primary-side compensation network, a primary-side signal transmitting circuit, a primary-side signal receiving circuit, a secondary-side drive circuit, a secondary-side full-bridge converter, a secondary-side compensation network, a secondary-side signal transmitting circuit, a secondary-side signal receiving circuit, an energy transmission coil, a signal transmission coil, and a power supply. The primary-side controller is connected to the signal transmission coil via the primary-side signal transmitting circuit and the primary-side signal receiving circuit; the primary-side drive circuit is connected to the primary-side controller; the primary-side full-bridge converter is connected to the primary-side drive circuit, the power supply, and the primary-side compensation network respectively; the primary-side compensation network is connected to the energy transmission coil. The secondary-side controller is connected to the signal transmission coil via the secondary-side signal transmitting circuit and the secondary-side signal receiving circuit; the secondary-side drive circuit is connected to the secondary-side controller; the secondary-side full-bridge converter is connected to the secondary-side drive circuit, the power supply, and the secondary-side compensation network respectively; the secondary-side compensation network is connected to the energy transmission coil.

9. A bidirectional wireless charging system based on full-duplex power-carrying communication according to claim 7, characterized in that, The primary-side controller specifically includes: a primary-side digital signal modulation module, a primary-side digital signal demodulation and bit synchronization module, and a primary-side PWM pulse generation module; the primary-side digital signal modulation module includes: a primary-side selection switch, a primary-side first crystal oscillator, a primary-side sine wave generator, and a primary-side tri-state gate circuit; the primary-side digital signal demodulation and bit synchronization module includes: a primary-side rectifier circuit, a primary-side FIR filter, a primary-side bit synchronization circuit, a primary-side phase detector, a primary-side microcontroller, a primary-side frequency divider, a primary-side clock conversion circuit, and a primary-side second crystal oscillator; the primary-side PWM pulse generation module includes: a primary-side phase detection delay circuit, a primary-side delay circuit, and a primary-side dead-time circuit; The primary-side sine wave generator is connected to the primary-side first crystal oscillator; the primary-side tri-state gate circuit is connected to the primary-side selection switch and the primary-side sine wave generator respectively; The primary-side FIR filter is connected to the primary-side rectifier circuit; the primary-side position synchronization circuit is connected to the primary-side FIR filter; the primary-side phase detector is connected to both the primary-side FIR filter and the primary-side frequency divider; the primary-side microcontroller is connected to both the primary-side phase detector and the primary-side clock conversion circuit; the primary-side frequency divider is connected to the primary-side microcontroller; and the primary-side clock conversion circuit is connected to the primary-side second crystal oscillator. The primary-side delay circuit is connected to the primary-side phase detection delay circuit; the primary-side dead-time circuit is connected to the primary-side delay circuit.

10. A bidirectional wireless charging system based on full-duplex power-carrying communication according to claim 7, characterized in that, The secondary-side controller specifically includes: a secondary-side digital signal modulation module, a secondary-side digital signal demodulation and bit synchronization module, and a secondary-side PWM pulse generation module; the secondary-side digital signal modulation module includes: a secondary-side selection switch, a secondary-side first crystal oscillator, a secondary-side sine wave generator, and a secondary-side tri-state gate circuit; the secondary-side digital signal demodulation and bit synchronization module includes: a secondary-side rectifier circuit, a secondary-side FIR filter, a secondary-side bit synchronization circuit, a secondary-side phase detector, a secondary-side microcontroller, a secondary-side frequency divider, a secondary-side clock conversion circuit, and a secondary-side second crystal oscillator; the secondary-side PWM pulse generation module includes: a secondary-side delay circuit and a secondary-side dead-time circuit; The secondary-side sine wave generator is connected to the secondary-side first crystal oscillator; the secondary-side tri-state gate circuit is connected to the secondary-side selection switch and the secondary-side sine wave generator respectively; The secondary-side FIR filter is connected to the secondary-side rectifier circuit; the secondary-side position synchronization circuit is connected to the secondary-side FIR filter; the secondary-side phase detector is connected to both the secondary-side FIR filter and the secondary-side frequency divider; the secondary-side microcontroller is connected to both the secondary-side phase detector and the secondary-side clock conversion circuit; the secondary-side frequency divider is connected to the secondary-side microcontroller; and the secondary-side clock conversion circuit is connected to the secondary-side second crystal oscillator. The secondary dead zone circuit is connected to the secondary delay circuit.

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