230 results about "Phase shift control" patented technology

The invention discloses a single-stage bidirectional power conversion topological structure capable of realizing wide-range soft switching and a control method of the single-stage bidirectional power conversion topological structure. In-bridge and inter-bridge phase shift control of a double-half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes; the switching frequency is adjusted in real time according to the magnitude of the port voltage, soft switching within a wide voltage change range is achieved, the current of a bridge arm connected with the primary side of the second transformer is the sum of the primary side current of the second transformer and the current of an inductor connected in parallel with the second transformer, and the inductance value of the inductor connected in parallel with the primary side of the second transformer is designed. The current of the bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching implementation range of the switching tube of the bridge arm connected with the primary side of the second transformer in a wide power transmission range can be expanded.

The invention discloses a dual active bridge converter and a DC bias suppression method thereof, and belongs to the technical field of power electronic converters, and the method comprises the steps: carrying out the bilateral single-phase shift modulation according to a distribution coefficient p when the dual active bridge converter operates in a steady state; establishing an inductive current function model of the dual-active bridge converter considering the high-frequency link resistance; when a phase shift angle between the primary side and the secondary side of the dual-active bridge converter changes, according to circuit parameters of the dual-active bridge converter, an inductive current function model and a phase shift ratio before and after the change, a transient phase shift ratio is calculated and allocated to the primary side and the secondary side for bilateral single phase shift modulation. By introducing the transient phase shift ratio and the distribution coefficient and combining a bilateral phase shift control mode, transient direct current bias generated by transient inductive current and converter magnetic flux can be eliminated, excessive design of a magnetic element is avoided, and the ratio of any high-frequency link resistance value to a shift term can reach a stable state within a switching period.

The invention provides a frequency modulation and phase shift hybrid modulation method for high-frequency LLC and a related device, which are applied to an LLC resonant converter and comprise the following steps: setting initial parameters of the LLC resonant converter; different system working frequencies are selected; for each system working frequency, determining a required phase shift angle according to a load demand and the system working frequency; and then judging whether the gain of the converter can meet the load requirement under the phase-shifting angle and the frequency, if not, adjusting the phase-shifting angle until the load requirement is met, and if so, taking the phase-shifting angle as a parameter combination. And then calculating system loss under parameter combinations corresponding to different frequencies, and finally selecting the combination with the minimum loss as a modulation parameter basis. The phase shift control is added on the basis of the traditional frequency modulation strategy, the output voltage can be accurately controlled without changing the topology of the converter, the influence of a dead zone under high frequency on the system is reduced, the optimal working point is determined through the balanced frequency modulation and phase shift strategy, the system loss is minimized, and the operation efficiency is improved.

The utility model provides a full-bridge LLC resonant converter control circuit, which is characterized in that a full-bridge LCC resonant converter is provided with a frequency conversion controller, a phase shift controller and a mode switching module, the input end of the mode switching module is connected with an input voltage detection module, and when the input voltage of the full-bridge LCC resonant converter is lower than a preset threshold value, the phase shift controller is connected with the mode switching module. When the input voltage of the full-bridge LCC resonant converter is larger than or equal to a preset threshold value, the variable frequency controller controls a switching tube in the full-bridge LCC resonant converter to work through switching of the switch, and when the input voltage of the full-bridge LCC resonant converter is larger than or equal to the preset threshold value, the phase shift controller controls the switching tube in the full-bridge LCC resonant converter to work through switching of the switch. The full-bridge LLC resonant converter has the advantages that the variable-frequency controller and the phase-shift controller are arranged in the control circuit at the same time, switching of control modes can be achieved based on judgment of the magnitude of input voltage and through a simple switching circuit, the full-bridge LLC resonant converter has the advantages of variable-frequency control and phase-shift control, and the problems of voltage fluctuation and instability are solved.

The invention discloses a three-phase-shift control method and system of a DAB converter, and relates to the technical field of converter control. Comprising the steps that a primary side voltage steady-state value, a secondary side voltage steady-state value and an expected value X * of a high-frequency transformer Tr in a target DAB converter and a sampling value X fed back by the output end of the target DAB converter are acquired; performing proportional integral on a difference value between the sampling value X and the expected value X * to obtain unit transmission power Y; determining the voltage ratio # imgabs0 # of the two sides of the inductor, and determining a first phase shift angle D1, a second phase shift angle D2 and a third phase shift angle D3 according to the unit transmission power Y and the voltage ratio # imgabs1 # of the two sides of the inductor; and performing signal modulation through the first phase shift angle D1, the second phase shift angle D2, the third phase shift angle D3 and the switching frequency fs to obtain a driving signal to control the target DAB converter. Design and implementation of a control strategy are greatly simplified, and the control method is clear in mechanism and easy to control.

The invention relates to an external phase shift angle determination method and system, a frequency conversion phase shift control method and a chip, and the method comprises the steps: obtaining an external phase shift angle based on a general solution of a time domain differential equation of a resonant inductor current and a resonant capacitor voltage of a DBSRC equivalent circuit and the symmetry of the DBSRC equivalent circuit; determining a first current value of the resonant inductor at the first moment and a second current value of the resonant inductor at the second moment; based on the first current value when the primary bridge circuit meets the ZVS soft switching requirement, obtaining a first relational expression of the external phase shift angle about the input voltage and the output voltage of the DBSRC and the switching frequency of the switching tube; based on a second current value when the secondary-side bridge circuit meets the ZVS soft switching requirement, obtaining a second relational expression of the external phase shift angle with respect to the input voltage, the output voltage and the switching frequency; according to the first relational expression, the second relational expression and the steady-state voltage value of the output end of the DBSRC, the expression of the external phase shift angle about the switching frequency, the steady-state voltage value and the input voltage is determined; the scheme is simple, the accuracy is high, and the portability is high.

The invention discloses a phased array distributed hierarchical control wave control system and a wave beam control method, and relates to the technical field of signal processing, the wave control system comprises a main control FPGA module, a plurality of sub-control FPGA modules and a plurality of T / R wave beam forming modules; the master control FPGA module is used for receiving a user instruction and outputting a phase shift control instruction according to the user instruction; the plurality of sub-control FPGA modules are in interactive connection with the main control FPGA module, and the sub-control FPGA modules are used for receiving the phase shift control instruction and outputting a phase shift code according to the phase shift control instruction; the plurality of T / R beamforming modules are respectively connected with the sub-control FPGA module and the antenna unit, and the T / R beamforming modules are used for receiving the phase shift codes and performing phase adjustment on the antenna unit according to the phase shift codes, so that not only can beam switching be quickly realized, but also the layout and wiring of a wave control board can be simplified, and the cost is reduced. And meanwhile, the requirements on the resources and the performance of the single FPAG and the cost of a wave control system are effectively reduced.

The invention provides a phase detection regulation and control system for an ultra-narrow-band Ku-band signal, and the system comprises a PL end which is used for carrying out the preprocessing of a plurality of paths of input Ku-band signals; the PS end is used for detecting the phases of the multiple paths of final baseband signals obtained through preprocessing to obtain a phase detection result and sending the phase detection result to the upper computer; the upper computer is used for generating a phase regulation and control instruction according to the phase detection result; and the phase shift control module adjusts the phase of the Ku wave band signal of the corresponding path. According to the method, multiple paths of narrowband signals can be synchronously extracted, phases of the narrowband signals can be analyzed, microsecond-level detection efficiency can be achieved, the LMS algorithm is introduced in the PL end processing process to extract narrowband target signals, a self-adaptive step length adjusting filter is introduced in the LMS algorithm, and detection precision is improved. The method has higher flexibility and adaptability, can effectively meet the processing requirements of different signal types in a complex environment, and improves the universality and applicability of a signal detection system.

The invention discloses an underwater vehicle battery state monitoring system and a power supply system based on wireless communication, and the system comprises a wireless power supply unit which employs a circuit structure of LCC-S compensation topology and is used for achieving constant voltage output; the battery monitoring unit is used for acquiring voltage, current and temperature data of the battery in real time; the communication unit comprises an RS-485 communication module and a matched LORA wireless communication module, and after sensor data is converted into an RS-485 signal, the RS-485 signal is transmitted through the LORA module after being converted by a serial port; and the control unit is located at an undersea wireless charging station end and is used for receiving the data transmitted by the LORA wireless communication module and calculating a phase shift angle based on a phase shift control strategy so as to generate a PWM signal to adjust the output voltage / current of the high-frequency inverter. By means of the system, real-time monitoring of the battery of the underwater vehicle is achieved, phase shift control is conducted on output of the primary side of the undersea wireless power supply system according to the battery charging information, and the safety and reliability of battery charging of the underwater vehicle in the marine environment are guaranteed.

The invention discloses a multi-channel symmetrical CLLC topological structure and a power balance control method thereof, and the structure comprises a multi-channel symmetrical CLLC converter main circuit loop, a high-precision sampling module, a phase shift angle controller module, an input capacitor, an output capacitor and an equivalent load. And more efficient electric energy conversion and power management control are realized. According to the power balance control method, phase shift control is carried out on a secondary side switching tube control signal of a power loop through a fundamental wave analysis method, a forward gain formula under the control method is derived, and output gain regulation and control are carried out on converters with power errors in the multi-path symmetrical CLLC converters. And thus, the power balance control among the multi-path symmetrical CLLC converters is realized.

Disclosed in the present application are a DAB converter control method based on global minimum backflow power, a device, and a storage medium. The method comprises: acquiring the current consumed power inside a DAB converter, and determining whether the current consumed power is equal to a preset power threshold; if the current consumed power is not equal to the preset power threshold, acquiring the current input voltage and the current output voltage of the DAB converter, and then, with the objective of minimizing the deviation of the average transmitted power of the DAB converter and the output backflow power of the DAB converter, using a particle swarm optimization algorithm to optimize the current phase shift ratio combination applied by the DAB converter during triple phase shift control, so as to obtain an optimal phase shift ratio combination; and on the basis of a preset voltage reference value and the current output voltage of the DAB converter, determining an outer phase shift angle correction value, and then controlling the DAB converter by combining the outer phase shift angle correction value with the optimal phase shift ratio combination. The present application introduces the particle swarm optimization algorithm for solving a multi-objective optimization problem, such that the DAB converter can maintain a relatively high energy transmission efficiency and reduce the effect of the output backflow power after operation adjustment.

The present application provides an on-board charger and a control method thereof. Since the transformer side of the AC / AC conversion circuit is connected to the AC side of the AC / DC conversion circuit via a transformer, the on-board charger has a single-stage structure. Furthermore, since the instantaneous sampling value of the grid-side current is equal to its instantaneous reference value when stable, and the instantaneous reference value of the grid-side current is determined by the phase of the instantaneous sampling value of the grid-side voltage and the reference peak value of the grid-side current, the on-board charger has a PFC function. Furthermore, since the battery-side charging power can be indirectly controlled by controlling the grid-side current, the on-board charger has a battery-side voltage and current control function. Furthermore, since phase shift control is performed on the two conversion circuits, and the phase shift control enables soft switching of the power devices in the two conversion circuits, and the single-stage structure reduces the current flowing through the devices, efficiency is improved. Therefore, the single-stage structure efficiently implements the PFC and battery-side voltage and current control functions of the two-stage isolated on-board charger.

The invention discloses a control method and system for a single-stage three-port V2G charging device, and relates to the technical field of charging pile converters, and the method comprises the steps: constructing a structure of a three-port converter, and obtaining a working mode of the converter; a phase shift control mode is adopted between the ports and between the two bridge arms of the full-bridge circuit; bidirectional power flow of energy between a power grid and a new energy automobile battery is completed, and multifunctional charging and discharging management is achieved. The converter is of a single-stage structure and has high power density, and flexible and bidirectional power exchange between alternating current and direct current ports can be achieved without a two-stage structure. In order to improve the efficiency of the converter, a phase shift angle is calculated by taking power as a constraint condition and taking current stress and soft switching as optimization targets, a three-port converter optimization modulation strategy which is suitable for the topology and takes a wide soft switching range and low current stress into account is designed, and efficient and reliable operation of the converter in three working modes of V2G, G2V and H2L can be realized.

The invention discloses a terahertz phase shifter chip based on a magnetic coupling line fine adjustment technology, the magnetic coupling line fine adjustment technology is applied to a magnetic coupling line distributed attenuator, and a magnetic coupling line is added below a transmission line of the magnetic coupling line distributed attenuator. And a switching transistor array and a capacitive compensation transistor are respectively added at two ends of the magnetic coupling line. A vector synthesis type structure is adopted, the magnetic coupling line fine adjustment technology is innovatively provided and applied to the magnetic coupling line distributed attenuator, compared with a traditional distributed attenuator, the magnetic coupling line distributed attenuator has the advantages of being higher in precision and smaller in attenuation stepping, the occupied area is the same, the phase shifting control function of the phase shifter is achieved based on the attenuator, and the application range is wide. Finally, the phase of an output signal is controlled to realize a phase control function of 5.625-degree phase shift stepping in a full 360-degree range, and an amplitude control function in a 3dB range can be realized.

The invention discloses a dual active bridge converter control method based on an extended state observer, and the method comprises the steps: constructing a state space model of a DAB, and carrying out the discretization of the state space model of the DAB, and obtaining an output voltage prediction model; constructing an extended state observer based on the state space model of the DAB, and combining the extended state observer and the output voltage prediction model to obtain an output voltage prediction model after observation; constructing a cost function based on the observed output voltage prediction model, and constructing a control law equation based on the cost function; the output voltage of the DAB is tracked in real time through an extended state observer and a control law equation, and a transmission power control value of the DAB is obtained; and solving a phase shift ratio of the DAB according to the transmission power control value of the DAB, and performing phase shift control on the DAB according to the phase shift ratio. According to the design, the response speed is high, and steady-state errors caused by parameter mismatch can be eliminated.

The application discloses a single-stage bidirectional power conversion topology structure capable of realizing wide-range soft switching and a control method thereof. The bridge-in and bridge-between phase shift control of a double half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes. The soft switching of a wide voltage variation range is realized by real-time adjustment of a switching frequency according to the size of a port voltage. The bridge arm current connected with the primary side of a second transformer is the sum of the primary side current of the second transformer and the inductance current connected with the primary side of the second transformer in parallel. By designing the inductance value of the parallel inductance connected with the primary side of the second transformer, the bridge arm current connected with the primary side of the second transformer can be effectively changed, so that the soft switching realization range of the switching tube of the bridge arm connected with the primary side of the second transformer under the wide power transmission range can be expanded.

The present invention discloses a digital implementation method for phase shift control based on an active half-bridge lithium battery equalizer, including a lithium battery cell voltage detection and calculation function, a voltage discrimination and phase shift ratio calculation function, and a drive signal determination function. Existing active half-bridge lithium battery equalizers adopt an open-loop control strategy, which has a low switching frequency, slow balancing speed, and large volume and weight. To overcome these shortcomings, a phase shift control strategy for the output voltage of each active half-bridge is proposed based on the voltage conditions of the lithium battery cells in the active half-bridge. The phase shift ratio of the active half-bridge output voltage is determined based on the difference between the voltage of the active half-bridge lithium battery cell and the average voltage of all lithium battery cells. The active half-bridge lithium battery equalizer that introduces phase shift control can operate at a higher switching frequency, reducing the volume and weight of the equalizer and accelerating the balancing speed.

The invention discloses a DAB converter phase shift control method without DC bias, which introduces a new control variable D4 to control a driving signal, and is suitable for various phase shift control strategies such as single phase shift, expanded phase shift, double phase shift, three phase shift and the like. According to the method, only input voltage and output voltage values need to be sampled, and an additional hardware circuit does not need to be added. The initial value and the final value of the auxiliary inductive current in a single switching period are both 0, and the inductive current in each switching period is completely symmetrical, so that the problem of power shortage of the first half switching period in a common direct current bias elimination method is solved, and good dynamic response performance is ensured from control. The method is simple in implementation process, and meanwhile good dynamic response performance is guaranteed.

The application provides a remote acoustic signal pickup method and system based on phase coding microwave sensing, comprising: constructing a phase coding matrix, and performing phase shift control on the transmission signals of multiple transmission antennas; controlling the multiple transmission antennas to simultaneously transmit a linear frequency modulation continuous wave signal, so that the main lobe of a synthesized beam is directed towards the direction of a to-be-detected acoustic source or the direction of a target medium; using one or more receiving antennas to receive echo signals of the acoustic source target, to obtain a corresponding number of baseband signals; performing acoustic vibration phase demodulation on the corresponding number of baseband signals, to extract vibration information of the surface of the medium target caused by the vibration information of the acoustic source or caused by the excitation of the acoustic wave; and reconstructing the acoustic signal, to realize remote acoustic pickup. The application overcomes the problems of weak echo signals, low signal-to-noise ratio, large adjacent target interference and low quality of reconstructed acoustic signals in remote acoustic pickup, and improves the signal-to-noise ratio and sensing distance of remote acoustic pickup.

The invention provides a radio frequency signal phase shift circuit, a radio frequency signal generating device and radio frequency power supply equipment, and relates to the technical field of radio frequency, and the radio frequency signal phase shift circuit comprises a first phase shift circuit, a second phase shift circuit and a phase shift control unit. The first phase shift circuit is used for moving the phase angle of the radio frequency signal by a first angle so as to obtain an intermediate phase shift signal and output the intermediate phase shift signal through the first output end. And the second phase shift circuit is used for moving the phase angle of the intermediate phase shift signal by a second angle to obtain a target phase shift signal and outputting the target phase shift signal through the output end. The phase shift control unit is connected with the first phase shift circuit and the second phase shift circuit, and is used for determining a first angle and a second angle at least according to the phase angle of the radio frequency signal and controlling the first phase shift circuit to move the phase angle of the radio frequency signal by the first angle; and controlling the second phase shift circuit to shift the phase angle of the intermediate phase shift signal by a second angle. The phase angle modulation requirement of the radio frequency signal can be met.

The invention discloses a CRM totem pole three-phase interlaced PFC control method, which comprises a signal sampling circuit, a filter circuit, a control circuit, an auxiliary winding circuit and a main power loop circuit, adopts a voltage mode control strategy, does not need a current inner loop, and simplifies a control system. The signal sampling circuit comprises an input voltage sampling circuit, an output voltage sampling circuit, an auxiliary winding voltage sampling circuit and an inductive current sampling circuit. The main power loop circuit comprises a first phase circuit, a second phase circuit and a third phase circuit which are mutually staggered and connected in parallel. The auxiliary winding circuit is used for controlling the turn-on time of the active tube, and the inductive current sampling circuit is used for controlling the turn-off time of the follow current tube, so that soft turn-on of the active tube in a full input voltage range is realized. The method can be expanded to an N-phase interleaving PFC system, and high-frequency current ripples are reduced through phase shift control. The method is suitable for occasions with high requirements on power supply performance, such as server power supplies and electric automobiles.

Embodiments of the present application provide a duodenum-based electric field ablation method, system and device, the method comprising: in the case of determining a target tissue corresponding to a target object, determining the narrow pulse parameters required by the target tissue; wherein the target tissue is the position of the target object's duodenum that needs to be subjected to pulse electric field ablation; determining the state information of the main control system; detecting the state information, and in the case that the state information meets the preset condition, generating a first pulse and a second pulse based on the narrow pulse parameters through the driving of the H-bridge circuit; wherein the preset condition is that the state information of the main control system meets the preset state; performing phase shift control processing based on the first pulse and the second pulse to determine the narrow pulse corresponding to the narrow pulse parameters; and achieving electric field ablation of the target tissue through multiple electrodes based on the narrow pulse. In the above scheme, the stability of the output of the narrow pulse is improved, thereby improving the electric field ablation effect on the duodenum.

The present application belongs to the field of power electronics technology, and specifically discloses a voltage compensation method and device for a cascaded multi-level inverter. In the present application, the predicted value of the output current of each H-bridge inverter module in the cascaded multi-level inverter is used to compensate the turn-on angle and turn-off angle of each H-bridge inverter module respectively, and the phase shift control signal of each switching device in the H-bridge inverter module is distributed according to the compensated turn-on angle and turn-off angle, thereby effectively compensating for the PWM voltage distortion caused by the dead zone effect and the switch parasitic capacitance effect. In addition, the present application does not need to detect the output current of the H-bridge inverter module, eliminating the current detection hardware and optical fiber communication delay time. In the high-frequency cascade topology, the low-order harmonics introduced by the dead zone effect and the switch parasitic capacitance effect can be effectively suppressed, significantly improving the waveform quality.

The present invention discloses a DAB converter control method, device, and storage medium based on global minimum return power. The method includes: obtaining the current power consumption within the DAB converter and determining whether it is equal to a preset power threshold; if not, obtaining the current input voltage and current output voltage of the DAB converter, and then using a particle swarm algorithm to optimize the current phase shift ratio combination used in triple phase shift control of the DAB converter with the goal of minimizing the deviation of the DAB converter's average transmission power and output return power to obtain an optimal phase shift ratio combination; determining an external phase shift angle correction value based on a preset voltage reference value and the current output voltage of the DAB converter, and then controlling the DAB converter in combination with the optimal phase shift ratio combination. By introducing a particle swarm algorithm to solve multi-objective optimization problems, the present invention enables the DAB converter to maintain high energy transmission efficiency after adjustment and reduce the impact of output return power.

To provide a power conversion device suppressing increases of a size and cost of a device, and failure risk, and applying phase shift PWM control.SOLUTION: A first and a second legs Leg1 and Leg2 have a DC electric power supply and a first to N-th units 41-4N of a full-bridge circuit connected in parallel to the DC electric power supply. One ends of reactors L11-L(2N)2 are connected respectively to u-phase and v-phase of the first to the N-th units 41-4N. The other ends of the reactors connected to the u-phase of the first to the N-th units 41-4N of the first leg Leg1 are connected each other to form an output terminal. Furthermore, the other ends of the reactors connected to the v-phase of each unit of the second leg are connected each other to form an output terminal. A control unit controls switching elements of the first to the N-th units 41-4N of the first and the second legs Leg1 and Leg2 by phase shift PWM control.SELECTED DRAWING: Figure 4

The invention discloses a single-stage bidirectional DC-AC converter minimum current stress optimization method, system and device and a medium, and belongs to the technical field of power electronic converter control, and the method comprises the steps: building an operation mechanism comprising four effective working modes based on the single-stage bidirectional DC-AC converter through a frequency conversion phase shift control strategy and aiming at bidirectional energy transmission demands, the inverter and the rectifier respectively correspond to inversion and rectification modes under different relations of input and output voltages. Taking the minimum current stress as a target function, solving the optimal shift ratio by combining the transmission power constraint and the soft switching condition, and calculating the real-time switching frequency by adopting equal power modulation. Frequency conversion control is introduced on the basis of phase shift control, power factor correction and soft switching constraint can be achieved at the same time, the optimal phase shift ratio and the switching frequency are directly solved through an analytical expression, and the calculation complexity of a traditional iterative algorithm is avoided.

The embodiment of the present application provides a method and device for suppressing common-mode current of a multi-converter wind power generator. The wind power generator has multiple sets of windings, and each converter is connected to a corresponding set of windings. The method comprises: sampling to obtain multiple common-mode current values of multiple converters in a predetermined time interval; determining a time interval of PWM operation phase shift based on the PWM operation period of the converter, the predetermined time interval, the number of converters, and the multiple common-mode current values of the multiple converters; determining a corresponding PWM operation phase shift time for each converter to suppress common-mode current based on the time interval of PWM operation phase shift; and performing phase shift control on the PWM signal of each converter based on the corresponding PWM operation phase shift time of each converter. Thus, the common-mode current generated by the multiple converters can be effectively suppressed.

This invention discloses a dual-path interleaved phase-shift current sharing control method and system based on FPGA. The PWM on the DSP side adopts a rising-falling counting method, setting it low when the rising count reaches the comparison value and high when the falling count returns to the comparison value. The DSP outputs four sets of PWM signals in the first path to the drive circuit, and simultaneously sends two sets of PWM signals from the first branch's upper bridge arm along with the synchronization signal to the FPGA. The control gain (Gain) is sent to the FPGA via SPI communication at intervals of one power frequency cycle. After receiving the above signals, the FPGA generates and outputs four sets of PWM signals in the second branch. Leveraging the FPGA's high-speed parallel processing capabilities, abundant programmable logic and I / O resources, and strict timing determinism, this invention can achieve precise PWM phase-shift control with real-time duty cycle compensation, thereby effectively improving the system's current sharing performance and current ripple characteristics, and enhancing the efficiency and long-term operational reliability of high-power power conversion systems.

The invention discloses a high-power modular LLC resonant converter interleaving parallel control system and method, and belongs to the technical field of power control. The system comprises a gain control unit, a voltage regulation unit and a stagger angle control unit which are arranged on the input side of an inverter, the gain control unit is used for calculating the difference of gains among phases according to the unbalance degree of output current of each phase and adjusting the conduction time of a switching tube of each phase by using phase shift control, and an output switching signal is input to a lower half bridge arm of the inverter after being subjected to phase shift of the interlacing angle control unit; the voltage regulation unit compares the difference value between the actual output voltage and the set output voltage as the input of the voltage-controlled oscillator, and the output switching signal is input to the upper half bridge arm of the inverter after being subjected to phase shift of the interleaving angle control unit; and the interlacing angle control unit calculates the interlacing angle of each phase during parallel connection according to the phase number of the parallel module and the operation mode of each phase, and adjusts the interlacing angle according to the amplitude of the output current ripple to realize the minimum output current ripple.

The invention discloses a wireless electric energy transmission system based on impedance self-adjustment and an efficiency improvement method thereof, and belongs to the technical field of wireless electric energy transmission. The system comprises a DC voltage source, an inversion module, a primary side compensation network, an integrated coupling mechanism, a secondary side compensation network, a rectification module, a filter capacitor and a load. The integrated coupling mechanism integrates the primary side compensation inductor, the secondary side compensation inductor and the coupling coil into a whole to form a self-adjusting variable inductor changing along with an air gap. Then, based on a second-generation non-dominated sorting genetic algorithm, multi-objective optimization is carried out on compensation capacitance and input voltage, and optimal parameters are determined under detuning degree constraint by taking minimization of output voltage fluctuation and total loss of the system as objectives; constant voltage output is achieved through phase shift control, and all-working-condition zero-voltage switching is achieved. The device does not need additional variable impedance elements, has the advantages of being simple in structure, stable in control, high in efficiency, high in air gap fluctuation resistance and the like, and is suitable for air gap dynamic change scenes such as wireless charging of automatic guided vehicles and electric vehicles.