Method and system for adjusting power of static wireless charging system

Abstract

The invention relates to the technical field of wireless power transmission, and particularly discloses a static wireless charging system power regulation method and system, aiming at system output voltage fluctuation, a buck circuit is designed, system output voltage is detected in real time and further compared with reference output voltage, and the duty ratio of an MOS tube in the buck circuit is dynamically controlled in cooperation with a voltage loop, so that the static wireless charging system power regulation is realized. Dynamic constant-voltage regulation of the system output voltage is realized, so that the system output power is stable. Besides, on the basis of fluctuation of the inverter voltage of the transmitting end, voltage loop and current loop control is carried out by detecting high-frequency inverter output voltage and current in real time, stable output of the inverter voltage of the transmitting end is achieved, and further stabilization of the output power of the system is facilitated. A comparison result shows that the method and the system for adjusting the power of the static wireless charging system provided by the invention can quickly stabilize the output power of the static wireless charging system.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and in particular to a power regulation method and system for a static wireless charging system. Background Art

[0002] When electric vehicles are actually charging, problems are prone to occur when the charging piles are buried underground or packaged on the ground, making them difficult to maintain directly. In addition, due to time factors, environmental factors, etc., aging will inevitably occur during the period, causing the underground part to be non-resonant, which may cause changes in the high-frequency waveform. When energy is transmitted, the receiving end receiving the energy from the transmitting end will also cause oscillations. After rectification by the rectifier bridge, the load will have a voltage imbalance problem, affecting the battery life.

[0003] For the receiving end, since the surrounding coils are being charged at the same time, the closely arranged coils will inevitably experience mutual inductance fluctuations. At the same time, due to the influence of environmental factors, the voltage at the receiving end will also fluctuate, resulting in power imbalance.

[0004] At present, there is a feedforward control method based on the small signal model, which analyzes the impact of mutual inductance fluctuations on power, and establishes a feedforward loop and PI controller for CC / CV mode (constant current / constant voltage) to solve the impact of mutual inductance fluctuations.

[0005] In view of the power imbalance caused by the change of equivalent load at the receiving end of the wireless charging system (DWC), a literature proposes a three-transmitter coil, i.e., a multi-transmitter single pickup structure to improve the electromagnetic coverage range, and adopts a double-sided LCC compensation circuit. In order to improve the constant current (CC) charging power transmission efficiency, the circuit structure is optimized, and a power control efficiency algorithm combined with optimal impedance tracking is proposed.

[0006] Currently, power balance is mainly focused on final power regulation, or directly adjusted using topology compensation, coils, etc., which is easily affected by changes in load-end voltage and environmental factors, resulting in power instability. Summary of the invention

[0007] The present invention provides a static wireless charging system power regulation method and system, and solves the technical problem of how to stabilize the system power.

[0008] In order to solve the above technical problems, the present invention provides a power regulation method for a static wireless charging system. The static wireless charging system includes an AC source, an AC to DC module, a full-bridge inverter, a primary resonant network, a coupling mechanism, a secondary resonant network, a full-bridge rectifier and a load resistor. The key point is that the power regulation method includes:

[0009] Connecting a buck circuit between the full-bridge rectifier and the load resistor;

[0010] The actual output voltage of the step-down buck circuit is detected in real time, and the PWM signal of the step-down buck circuit is adjusted according to the difference between the actual output voltage and the reference output voltage until the actual output voltage of the step-down buck circuit is equal to the reference output voltage.

[0011] Furthermore, the buck circuit includes a capacitor C d1 , MOS tube Q1, diode D1, inductor L, capacitor C d2 , capacitor C d1 The two ends of are connected to the two output ends of the full-bridge rectifier, and the drain of the MOS tube Q1 is connected to the capacitor C d1 The source of MOS tube Q1 is connected to one end of inductor L and the negative end of diode D1, and the positive end of diode D1 is connected to capacitor C d1 The other end and capacitor C d2 One end of the inductor L is connected to the capacitor C d2 The other end of the load resistor is connected in parallel with the capacitor C d2 .

[0012] Furthermore, the voltage regulation process of the step-down buck circuit is specifically as follows:

[0013] Obtain the vehicle speed v, coil size l, and frequency w to determine the initial phase of the voltage change caused by the vehicle's motion;

[0014] Three basic parameters γ1, γ2, and γ3 are established to adjust voltage changes, environmental changes, and receiving end voltage changes respectively;

[0015] Based on the basic parameters γ1, γ2, γ3, three time states Ψ1, Ψ2 and Ψ3 are established, and the i-th time state is established as: Ψ i =γi*Ψ i ′+A*(Ψ i ′-K*Verror), Ψ i ′ represents the previous state of state Ψi (the initial state is set to the initial value), Verror represents the difference between the actual output voltage and the reference output voltage, K represents the gain coefficient for Verror, and A represents the gain coefficient for Ψ i ′-K*Verror gain factor;

[0016] The total number of states Ψ is obtained by averaging each time state;

[0017] Then the new duty cycle θ is obtained, which can be expressed as: θ = (Ψ-K*Verror) / 100;

[0018] Adjust θ so that the final voltage is stable.

[0019] Furthermore, the power regulation method also includes: adding a power quality filter for filtering out clutter before the full-bridge inverter.

[0020] Furthermore, the power regulation method also includes: detecting the output voltage and output current of the full-bridge inverter in real time, and using PI control to form a current loop and a voltage loop to regulate the output voltage and current of the inverter to be constant.

[0021] Furthermore, the power regulation method also includes: synchronizing the phases of the transmitting coil and the receiving coil.

[0022] The present invention also provides a static wireless charging system power regulation system, which is applied to the static wireless charging system power regulation method. The key lies in: comprising a buck circuit and a secondary side controller, the buck circuit is connected between the full-bridge rectifier and the load resistor, the secondary side controller is used to detect the actual output voltage of the buck circuit in real time, and adjust the PWM signal of the buck circuit according to the difference between the actual output voltage and the reference output voltage until the actual output voltage of the buck circuit is equal to the reference output voltage.

[0023] Preferably, the buck circuit includes a capacitor C d1 , MOS tube Q1, diode D1, inductor L, capacitor C d2 , capacitor C d1 The two ends of are connected to the two output ends of the full-bridge rectifier, and the drain of the MOS tube Q1 is connected to the capacitor C d1 The source of MOS tube Q1 is connected to one end of inductor L and the negative end of diode D1, and the positive end of diode D1 is connected to capacitor C d1 The other end and capacitor C d2 One end of the inductor L is connected to the capacitor C d2 The other end of the load resistor is connected in parallel with the capacitor C d2 .

[0024] Preferably, the voltage regulation process of the secondary side controller on the step-down buck circuit is specifically as follows:

[0025] Obtain the vehicle speed v, coil size l, and frequency w to determine the initial phase of the voltage change caused by the vehicle's motion;

[0026] Three basic parameters γ1, γ2, and γ3 are established to adjust voltage changes, environmental changes, and receiving end voltage changes respectively;

[0027] Based on the basic parameters γ1, γ2, γ3, three time states Ψ1, Ψ2 and Ψ3 are established, and the i-th time state is established as: Ψ i =γi*Ψi ′+A*(Ψ i ′-K*Verror), Ψ i ′ represents the state Ψ i The previous state (the initial state is set to the initial value), Verror represents the difference between the actual output voltage and the reference output voltage, K represents the gain factor for Verror, and A represents the gain factor for Ψ i ′-K*Verror gain factor;

[0028] The total number of states Ψ is obtained by averaging each time state;

[0029] Then the new duty cycle θ is obtained, which can be expressed as: θ = (Ψ-K*Verror) / 100;

[0030] Adjust θ so that the final voltage is stable.

[0031] Preferably, the system also includes a power quality filter connected before the full-bridge inverter for filtering out clutter; the system also includes a primary side controller, which is used to detect the output voltage and output current of the full-bridge inverter in real time, and adopts PI control to form a current loop and a voltage loop to adjust the output voltage and current of the inverter to be constant.

[0032] The power regulation method and system of the static wireless charging system provided by the present invention designs a buck circuit for the fluctuation of the system output voltage, detects the system output voltage in real time, further compares it with the reference output voltage, and dynamically controls the duty cycle of the MOS tube in the buck circuit with the voltage loop to achieve dynamic constant voltage regulation of the system output voltage, so that the system output power is stable. In addition, based on the fluctuation of the inverter voltage at the transmitting end, the high-frequency inverter output voltage and current are detected in real time to perform voltage loop and current loop control, so as to achieve stable output of the inverter voltage at the transmitting end, which is beneficial to further stabilize the output power of the system. The comparison results show that the power regulation method and system of the static wireless charging system provided by the present invention can quickly stabilize the output power of the static wireless charging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of a power regulation method and system for a static wireless charging system provided by an embodiment of the present invention;

[0034] Figure 2 is a flow chart of a power regulation method for a static wireless charging system provided by an embodiment of the present invention;

[0035] Figure 3 is a flow chart of adjusting the secondary side output voltage provided by an embodiment of the present invention;

[0036] Figure 4is a flow chart of adjusting the primary inverter output voltage and current provided by an embodiment of the present invention;

[0037] Figure 5 2 is a comparison result diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following specifically illustrates the implementation mode of the present invention in conjunction with the accompanying drawings. The embodiments are provided for illustrative purposes only and cannot be understood as limiting the present invention. The accompanying drawings are provided for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0039] The static wireless charging system power regulation method provided by the embodiment of the present invention is as follows: Figure 1 As shown, the static wireless charging system includes an AC source, an AC to DC module, a full-bridge inverter, a primary resonant network, a coupling mechanism, a secondary resonant network, a full-bridge rectifier and a load resistor R L , the power regulation method comprises:

[0040] Connecting a buck circuit between the full-bridge rectifier and the load resistor;

[0041] The actual output voltage of the step-down buck circuit is detected in real time, and the PWM signal of the step-down buck circuit is adjusted according to the difference between the actual output voltage and the reference output voltage until the actual output voltage of the step-down buck circuit is equal to the reference output voltage.

[0042] like Figure 1 As shown, the step-down buck circuit includes a capacitor C d1 , MOS tube Q1, diode D1, inductor L, capacitor C d2 , capacitor C d1 The two ends of are connected to the two output ends of the full-bridge rectifier, and the drain of the MOS tube Q1 is connected to the capacitor C d1 The source of MOS tube Q1 is connected to one end of inductor L and the negative end of diode D1, and the positive end of diode D1 is connected to capacitor C d1 The other end and capacitor C d2 One end of the inductor L is connected to the capacitor C d2 The other end of the load resistor is connected in parallel with the capacitor C d2 .

[0043] The duty cycle of MOS tube Q1 is adjusted through PWM signal, and the output voltage is finally controlled to be stable. When open-loop control is used, the final waveform will have related disturbances, which is not conducive to the stable power design of the wireless charging system. To address this problem, this example designs an efficient PI controller, which adjusts the output voltage of the receiving end through the voltage loop. By controlling the duty cycle, the output voltage (final voltage) of the step-down buck circuit (chopper circuit) can be directly adjusted to achieve final power stability.

[0044] The differential equation of the step-down buck circuit can be expressed as:

[0045]

[0046] Among them, i L is the total current at the load end, u cd1 C d1 Voltage (voltage before chopping), u cd2 C d2 (voltage after chopping, i.e. voltage at the load end), d is the calculus form, which represents the time state integral.

[0047] The WPT system in this example takes the LC-S compensation topology as an example. Figure 1 As shown, the primary resonant network includes a compensation inductor L connected in series with the transmitting coil. f And the compensation capacitor C connected in parallel with the transmitting coil p1 The primary resonant network includes a compensation capacitor C in series with the receiving coil. s The full-bridge inverter consists of four MOS tubes, and the full-bridge rectifier consists of four diodes.

[0048] For the WPT system output, the inverter input voltage U P And the topology part output voltage U S The relationship can be expressed as:

[0049]

[0050] Among them, U P Indicates u P The effective value of the fundamental voltage, U in Represents the input voltage of the full-bridge inverter, U s Represents the rectifier input voltage u s The effective value of the fundamental voltage, U buck It represents the input voltage of the step-down buck circuit, which is also the output voltage of the full-bridge regulator.

[0051] By controlling the duty cycle θ of MOS tube Q1, the final voltage V o (System output voltage, i.e. u cd2 ) is regulated, so the load terminal voltage can be expressed as:

[0052]

[0053] M represents the transmitting coil L p and receiving coil L s The mutual induction between.

[0054] The fluctuation of the final power of the system can be regarded as the superposition of three parts, namely, the voltage fluctuation caused by the environment and life factors at the transmitting end, the voltage fluctuation caused by the movement factors and the change of mutual inductance at the receiving end. This fluctuation is mainly related to the vehicle model and the relative distance of charging, and the charging power in different modes. The third part is mainly caused by environmental factors, such as the possible clutter caused by weather, humidity, signal, etc. According to the voltage change at the receiving end, it can be expressed as power grid factors, environmental factors, and movement factors.

[0055] The voltage changes of the system caused by the above three factors are modeled as:

[0056]

[0057] U s1 It is the part of the voltage that is disturbed before rectification at the load end. It is the voltage change caused by grid factors, environmental factors or movement factors. U bian It is the type of specific voltage change, which can be regarded as the cumulative expression of superimposed sinusoidal functions (different initial phases, different phase angles, different amplitudes, and the overall state is a superposition state); U is a basic quantity representing voltage, for example, 5V fluctuates around 5V, and w is the phase representing the frequency of the waveform. They are the initial phase angles of the 3rd and 5th harmonics respectively, and a3 and a5 are the corresponding amplitude influencing factors.

[0058] The specific adjustment process of the voltage loop is:

[0059] First, based on the reference voltage, the voltage error is obtained by subtracting the reference voltage from the detected final voltage value, and the voltage error is used as the adjustment function with 0 as the reference. The vehicle speed will cause the amplitude and the final voltage frequency to change. In this process, the phase, frequency, and amplitude are unknown. A phase parameter can be set as a reference so that there is a basic value in the initial situation.

[0060] If the final power of the chopping part is P, then the power P at the load end R out It can be expressed as:

[0061] P out =u cd2 *i out (5)

[0062] Then for P we have:

[0063] P=P out +P huanerr +P Verr (6)

[0064] Among them, P Verr It can be expressed as the power change caused by the change in voltage range. According to the disturbance change, it can be decomposed into the Fourier function expression. Since the current is proportional to the voltage, the disturbance change can be equivalent to the square of the change. Assume that the equivalent load parameter is α, and the AC voltage (the input voltage of the rectifier) ​​is set to V under normal circumstances. in , under abnormal conditions, the AC voltage is V F , then the disturbance power change can be expressed as:

[0065]

[0066] P huanerr It can be expressed as the factors that cause the power instability at the load end due to environmental factors, including the inevitable oscillation factors caused by the sudden change of voltage when the coil is switched, the random environmental oscillation factors caused by the power loss caused by the energy storage of the inductor and capacitor, etc. Assume that the power change rate caused by the inevitable oscillation factor is P fix , random environmental shock factors cause the power change to be P ev Since the two groups of changes are difficult to quantify and decompose, they can be regarded as random fuzzy quantities here.

[0067] For the high-power dynamic wireless charging system, the power stability design ultimately requires stable voltage and current. In the regulation process, in addition to the compensation capacitor C d1 Voltage across the two ends u cd1 In addition, the system input voltage will directly affect the stability of power. Since the system input mainly causes the AC voltage change to cause voltage deviation during the DC conversion process, the input adjustment mainly adopts AC filtering processing methods, such as Figure 1 As shown in Figure 1, in this example, a power quality filter is added before the full-bridge inverter to filter out some clutter.

[0068] In addition, the present invention also detects the output voltage and output current of the full-bridge inverter in real time, and adopts PI control to form a current loop and a voltage loop to adjust the output voltage and current of the inverter, so that the initial inversion process is rapid and stable.

[0069] In addition, the present invention also designs a power quality regulator for synchronizing the phases of the transmitting coil and the receiving coil.

[0070] So far, the power regulation of the present invention mainly includes three groups of regulation methods, one of which is the harmonic stability regulation of the input end (through the power quality filter / power filter), the second part is the phase synchronization regulation of the primary and secondary coils (power quality regulator), and the third part is the PI controller regulation. There are three loops in total for the PI controller, namely, the transmitter performs closed-loop regulation on the inverter output current (through the PI controller), the inverter output voltage performs closed-loop regulation (through the PI controller), and the output voltage of the receiver performs closed-loop regulation (through the PI controller).

[0071] like Figure 2 As shown in the flowchart of , the power regulation process of the present invention (operation process of the static wireless charging system) is:

[0072] The AC source (grid) is used for direct power supply. Some noise may be generated in the process. The noise is filtered out by an electric energy filter. At this time, the transmitted current may still have harmonics of the grid part, reducing the voltage. At this time, the voltage is adjusted to the required rated 800V voltage. The 800V DC is adjusted to high-frequency AC through a full-bridge inverter. At this time, the high-frequency AC may have the voltage problem mentioned by the grid part. Therefore, the voltage loop and current loop are adjusted here to keep the output stable. Then the energy is transmitted through the coil. During this process, fluctuations may still occur due to relative motion environmental factors. Here, a chopper circuit and a PI controller are used to dynamically adjust the voltage for unknown changes, and finally keep the power stable.

[0073] For the voltage regulation at the receiving end, the specific process is as follows Figure 3 As shown, including:

[0074] Obtain the vehicle speed v, coil size l, and frequency w to determine the initial phase of the voltage change caused by the vehicle's motion;

[0075] After obtaining the initial phase that causes the change, the output voltage of the buck circuit is directly related to the input voltage, duty cycle, and compensation inductance L. The input voltage can be regarded as unchanged after being adjusted by the power quality regulator of the voltage loop and current loop of the transmitter, and the compensation inductance L is also regarded as unchanged. At this time, the core influencing factor is the duty cycle;

[0076] Three basic parameters γ1, γ2, and γ3 are established to adjust voltage changes, environmental changes, and receiving end voltage changes respectively;

[0077] Based on the basic parameters γ1, γ2, γ3, three time states Ψ1, Ψ2 and Ψ3 are established, and the i-th time state is established as: Ψ i =γi*Ψ i ′+A*(Ψ i ′-K*Verror), Ψ i ′ represents the state Ψi The previous state (the initial state is set to the initial value), Verror represents the difference between the actual output voltage and the reference output voltage, K represents the gain factor for Verror, and A represents the gain factor for Ψ i ′-K*Verror gain factor;

[0078] The total number of states Ψ is obtained by averaging each time state;

[0079] Then the new duty cycle θ is obtained, which can be expressed as: θ = (Ψ-K*Verror) / 100;

[0080] Adjust θ so that the final voltage is stable.

[0081] For the voltage loop and current loop regulation at the transmitter, such as Figure 4 As shown in the flowchart, it includes:

[0082] When the operation starts, the primary circuit is initialized and adjusted to obtain the relative movement speed. The size of the car and the bottom coil is fixed, and an initial phase angle that roughly adjusts the relative change is generated. After the energy is transmitted, it is rectified and converted into direct current. The error part is obtained according to the built-in voltage sensor. Among them, the influence of environmental changes is the most complex, so the environmental adjustment parameters are dynamically adjusted, and the voltage and receiving end are static. It can be dynamically adjusted similar to the PI regulator. Through the given gain and time function adjustment, the duty cycle is adjusted through the three control objects to finally keep the final power stable.

[0083] The embodiment of the present invention also provides a power regulation system for a static wireless charging system, based on the above-mentioned power regulation method for a static wireless charging system, including a buck circuit and a secondary controller, wherein the buck circuit is connected between the full-bridge rectifier and the load resistor, and the secondary controller is used to detect the actual output voltage of the buck circuit in real time, and adjust the PWM signal of the buck circuit according to the difference between the actual output voltage and the reference output voltage until the actual output voltage of the buck circuit is equal to the reference output voltage. The system also includes a power quality filter for filtering out clutter connected before the full-bridge inverter; the system also includes a primary controller, which is used to detect the output voltage and output current of the full-bridge inverter in real time, and adopts PI control to form a current loop and a voltage loop to adjust the output voltage and current of the inverter to be constant.

[0084] The final result is Figure 5As shown, LC-S is the system output voltage response curve without any control, PI is the system output voltage response curve when only PI control is added to the inverter output and system output (without adding a buck circuit), and EQPI is the system output voltage response curve obtained by applying the present invention. Figure 5 It can be seen that the controller designed by the present invention has a significant effect on voltage regulation for the unknown influence of the voltage applied to the overall circuit and environmental changes. At the beginning of the voltage boost stage, although the flicker voltage causes the overall voltage of the power grid to increase significantly, the controller has a very obvious effect on suppressing the voltage increase, keeping the overall voltage stable. Although there will be large disturbances during the stabilization process, it can enter the charging state in only 0.002s, proving the effective ability of the controller to resist power quality disturbances. When the circuit tends to be stable, there are still disturbances in the subsequent circuit, but the power remains stable, reflecting the designed controller's ability to suppress large voltages and voltage stabilization performance.

[0085] In summary, the power regulation method and system of the static wireless charging system provided by the embodiment of the present invention designs a buck circuit for the fluctuation of the system output voltage, detects the system output voltage in real time, further compares it with the reference output voltage, and dynamically controls the duty cycle of the MOS tube in the buck circuit with the voltage loop to achieve dynamic constant voltage regulation of the system output voltage, so that the system output power is stable. In addition, based on the fluctuation of the inverter voltage at the transmitting end, the high-frequency inverter output voltage and current are detected in real time to perform voltage loop and current loop control, so as to achieve stable output of the inverter voltage at the transmitting end, which is beneficial to further stabilization of the system output power. The comparison results show that the power regulation method and system of the static wireless charging system provided by the present invention can quickly stabilize the output power of the static wireless charging system.

[0086] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A power regulation method for a static wireless charging system, wherein the static wireless charging system comprises an AC source, an AC to DC module, a full-bridge inverter, a primary resonant network, a coupling mechanism, a secondary resonant network, a full-bridge rectifier and a load resistor, wherein: The power regulation method includes: Connecting a buck circuit between the full-bridge rectifier and the load resistor; The actual output voltage of the step-down buck circuit is detected in real time, and the PWM signal of the step-down buck circuit is adjusted according to the difference between the actual output voltage and the reference output voltage until the actual output voltage of the step-down buck circuit is equal to the reference output voltage.

2. The method for adjusting the power of a static wireless charging system according to claim 1, characterized in that: The buck circuit includes a capacitor C d1 , MOS tube Q1, diode D1, inductor L, capacitor C d2 , capacitor C d1 The two ends of are connected to the two output ends of the full-bridge rectifier, and the drain of the MOS tube Q1 is connected to the capacitor C d1 The source of MOS tube Q1 is connected to one end of inductor L and the negative end of diode D1, and the positive end of diode D1 is connected to capacitor C d1 The other end and capacitor C d2 One end of the inductor L is connected to the capacitor C d2 The other end of the load resistor is connected in parallel with the capacitor C d2 .

3. The static wireless charging system power regulation method according to claim 2, characterized in that: The voltage regulation process of the step-down buck circuit is as follows: Obtain the vehicle speed v, coil size l, and frequency w to determine the initial phase of the voltage change caused by the vehicle's motion; Three basic parameters γ1, γ2, and γ3 are established to adjust voltage changes, environmental changes, and receiving end voltage changes respectively; Based on the basic parameters γ1, γ2, γ3, three time states Ψ1, Ψ2 and Ψ3 are established, and the i-th time state is established as: Ψ i =γi*Ψ i ′+A*(Ψ i ′-K*Verror), Ψ i ′ represents the state Ψ i The previous state, Verror represents the difference between the actual output voltage and the reference output voltage, K represents the gain factor for Verror, and A represents the gain factor for Ψ i ′-K*Verror gain factor; The total number of states Ψ is obtained by averaging each time state; Then the new duty cycle θ is obtained, which can be expressed as: θ = (Ψ-K*Verror) / 100; Adjust θ so that the final voltage is stable.

4. The static wireless charging system power regulation method according to claim 3, characterized in that: The power regulation method also includes: adding a power quality filter for filtering out clutter before the full-bridge inverter.

5. The method for adjusting the power of a static wireless charging system according to claim 4, characterized in that: The power regulation method also includes: detecting the output voltage and output current of the full-bridge inverter in real time, and adopting PI control to form a current loop and a voltage loop to regulate the output voltage and current of the inverter to be constant.

6. The method for adjusting the power of a static wireless charging system according to claim 5, characterized in that: The power regulation method also includes: synchronizing the phases of the transmitting coil and the receiving coil.

7. A static wireless charging system power regulation system, applied to the static wireless charging system power regulation method according to any one of claims 1 to 6, characterized in that: The invention comprises a buck circuit and a secondary side controller, wherein the buck circuit is connected between the full-bridge rectifier and the load resistor, and the secondary side controller is used to detect the actual output voltage of the buck circuit in real time, and to adjust the PWM signal of the buck circuit according to the difference between the actual output voltage and the reference output voltage, until the actual output voltage of the buck circuit is equal to the reference output voltage.

8. The power regulation system of the static wireless charging system according to claim 7, characterized in that: The buck circuit includes a capacitor C d1 , MOS tube Q1, diode D1, inductor L, capacitor C d2 , capacitor C d1 The two ends of are connected to the two output ends of the full-bridge rectifier, and the drain of the MOS tube Q1 is connected to the capacitor C d1 The source of MOS tube Q1 is connected to one end of inductor L and the negative end of diode D1, and the positive end of diode D1 is connected to capacitor C d1 The other end and capacitor C d2 One end of the inductor L is connected to the capacitor C d2 The other end of the load resistor is connected in parallel with the capacitor C d2 .

9. The power regulation system of the static wireless charging system according to claim 8, characterized in that: The voltage regulation process of the secondary side controller for the step-down buck circuit is specifically as follows: Obtain the vehicle speed v, coil size l, and frequency w to determine the initial phase of the voltage change caused by the vehicle's motion; Three basic parameters γ1, γ2, and γ3 are established to adjust voltage changes, environmental changes, and receiving end voltage changes respectively; Based on the basic parameters γ1, γ2, γ3, three time states Ψ1, Ψ2 and Ψ3 are established, and the i-th time state is established as: Ψ i =γi*Ψ i ′+A*(Ψ i ′-K*Verror), Ψ i ′ represents the state Ψ i The previous state, Verror represents the difference between the actual output voltage and the reference output voltage, K represents the gain factor for Verror, and A represents the gain factor for Ψ i ′-K*Verror gain factor; The total number of states Ψ is obtained by averaging each time state; Then the new duty cycle θ is obtained, which can be expressed as: θ = (Ψ-K*Verror) / 100; Adjust θ so that the final voltage is stable.

10. The power regulation system of the static wireless charging system according to claim 9, characterized in that: The system also includes a power quality filter connected before the full-bridge inverter for filtering out clutter; the system also includes a primary side controller, which is used to detect the output voltage and output current of the full-bridge inverter in real time, and adopts PI control to form a current loop and a voltage loop to adjust the output voltage and current of the inverter to be constant.

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