150 results about "Phase shift control" patented technology

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 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 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.

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 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 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 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 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 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.

The application provides a radio frequency signal phase shift circuit, a radio frequency signal generating device and a radio frequency power supply equipment, and relates to the technical field of radio frequency. 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 a radio frequency signal by a first angle to obtain an intermediate phase shift signal and output the intermediate phase shift signal through a first output end. 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 output the target phase shift signal through a second output end. The phase shift control unit is connected with the first phase shift circuit and the second phase shift circuit. The phase shift control unit is used for determining the first angle and the second angle according to the phase angle of the radio frequency signal, 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 move the phase angle of the intermediate phase shift signal by the second angle. The application can meet the phase angle modulation requirement of the radio frequency signal.

The present invention provides a high-speed MEMS optical phase shifter, its array, packaging structure, and optical device. In the phase shifter, fixed drive comb teeth in the second planar region and dynamic drive comb teeth in the first planar region form an electrostatic comb driver; a flat drive electrode in the substrate layer and a vertically moving micromirror in the first planar region form an electrostatic flat driver; a displacement sensor senses the displacement of the vertically moving micromirror and provides closed-loop feedback control of the drive state. In the present invention, a dual drive structure of comb teeth and flat plate drives the vertically moving micromirror in opposite directions, achieving high-speed optical phase shifting with a simple structure. The closed-loop feedback control and dual drive structure simultaneously improve the accuracy of phase shift control. Furthermore, the high-speed phase shifting of the MEMS phase shifter meets the application requirements of high-speed phase shifting with low cost, low power consumption, and a small size. Finally, a displacement sensor integrated within the MEMS chip indicates the phase shift of the MEMS optical phase shifter and provides closed-loop feedback to adjust the drive states of the electrostatic comb driver and electrostatic flat driver, thereby improving the performance of the high-speed phase shifting device.

The invention relates to the field of electronic converters, in particular to an integrated power grid power supply multi-port converter and a conversion control method. A power grid voltage is input into the rectification unit, the primary side module is provided with a full-bridge structure and an interlaced bidirectional structure, receives a DC voltage and is connected to an energy storage port, the secondary side module is connected to a load port, obtains a power grid voltage phase through a phase-locked loop, and generates a switching signal of a rectification circuit through double closed-loop control; voltage stabilization and current ripple reduction of an energy storage port are realized by adopting double closed-loop control and staggered phase shift control; the phase shift control generates a switching signal of the secondary side module. Power grid input, an energy storage port and a load port are subjected to single-stage power conversion to realize energy management, and energy loss of traditional multi-stage conversion is reduced due to efficient connection of the transformer. The 180-degree staggered phase shift driving mode enables the inductors to work alternately, reduces the current ripples of the energy storage port, and improves the energy transmission smoothness and the system efficiency.

The invention discloses a double-phase-shift control method suitable for a bilateral leakage inductance compensation wireless power transmission system, and belongs to the field of wireless power transmission. The coupling coefficient of the magnetic coupling mechanism is between 0.7 and 0.8, the series capacitor only compensates leakage inductance at the resonant frequency, and constant voltage output irrelevant to a system and a load is achieved; wide-range buck-boost regulation and control under the minimum on-state loss are also achieved, when the duty ratio of the inverter is kept 50% and the rectifier performs phase shift action, the system achieves boost output, and when the inverter performs phase shift action and the duty ratio of the rectifier is kept 50%, the system achieves buck output. The power factors of the output end of the inverter and the input end of the rectifier approach to 1 by keeping the external phase shift angle between the front stage and the rear stage to be 0; according to the invention, the compensation parameter and the working frequency are accurately selected, the degree of freedom of system control is fully utilized, and a system control strategy scheme is reasonably set, so that a high-efficiency, wide-range and constant-voltage output power converter is realized, and introduction of an extra power hardware link is avoided.

The application provides a switching power supply control method, device and power supply system, the method comprising: determining any one of N transformer modules as a master module, and taking the remaining transformer modules except the master module as slave modules; when receiving a control instruction, outputting a synchronization signal to each slave module; determining a delay time corresponding to each slave module according to a first time of outputting the synchronization signal and a second time of each slave module receiving the synchronization signal; performing phase shift control on the master module, and performing phase shift control on each slave module based on the delay time, so that the driving signals of each transformer module and each transformer in each transformer module are uniformly phase shifted in a preset period. The technical scheme of the application can effectively reduce the input current ripple of the switching power supply, thereby realizing reduction of the output current ripple of an input source connected with the switching power supply, and ensuring the performance and service life of the input source.

The invention relates to the technical field of DC-DC conversion, and discloses a bidirectional DC-DC converter based on zero-voltage soft switching, which comprises a high-voltage-side full-bridge circuit, the high-voltage-side full-bridge circuit is composed of four high-voltage switching tubes S1 to S4, body diodes D1 to D4 corresponding to the switching tubes and junction capacitors C1 to C4, the output end of the high-voltage-side full-bridge circuit is connected with a high-voltage-side filter capacitor Ch in parallel, and the output end of the high-voltage-side filter capacitor Ch is connected with the output end of the high-voltage-side full-bridge circuit. The voltage stabilizing circuit is used for stabilizing the voltage Uh of the high-voltage side, and the low-voltage side full-bridge circuit is composed of four low-voltage switch tubes S5-S8, body diodes D5-D8 corresponding to the switch tubes and junction capacitors C5-C8. According to the bidirectional DC-DC converter based on the zero-voltage soft switching, zero-voltage switching-on and switching-off of the full-bridge switching tubes are achieved through the resonance network, switching loss is remarkably reduced, particularly, the efficiency is improved by 5%-8% compared with a traditional hard switching under the high-frequency working condition, the rapid dynamic response characteristic is achieved, and the reliability of the converter is improved through the combination of leakage inductance of the transformer and an external resonance inductor. And in combination with phase shift control, full-range soft switching from 20% of rated load to full load is realized.

The utility model discloses a 2000V power controller integrating power regulation and voltage regulation, which comprises a box body and a control panel, and a silicon controlled rectifier is arranged on the control panel. The silicon controlled rectifier is provided with a 2000V three-phase load power supply, a thyristor, a mutual inductor, a control signal wiring terminal, a start / stop switch wiring terminal, a fault alarm wiring terminal, a 220V power supply wiring terminal, a power regulation / voltage regulation switching circuit, a dial switch and a state sending wiring terminal, and the silicon controlled rectifier is triggered by a digital circuit to realize phase shift voltage regulation and power regulation. The adjusting mode is automatically changed according to the requirements or properties of different loads; if the load power is too large during starting, a voltage regulation mode is firstly used for working, then the current value is detected to be reduced, then a power regulation mode is automatically switched so as to eliminate harmonic waves during voltage regulation, a phase shift control mode is adopted for voltage regulation, and a cyclic wave power regulation mode is adopted for power regulation.

The technology described herein is directed towards phase-change material-based (e.g., chalcogenide) radio frequency components that can be used in unit cells of a reconfigurable intelligent surface. A multi-state tunable capacitive element for reconfigurable operation is described, in which phase-change material operates as a switching element to controllably vary capacitance of each unit cell. The multi-state tunable capacitive element can be made of multiple subcircuits in which capacitors of various values can be selectively switched in or out to vary the capacitance of the multi-state tunable capacitive element, resulting in a phase change of a unit cell with respect to reflecting or refracting an electromagnetic wave. By arranging the subcircuits with capacitors of different values, and actuating each one in or out of the overall capacitive element, an analog-like variable capacitor is provided to provide more granular phase shift control of cells of a reconfigurable intelligent surface.

The invention discloses a high-voltage port capacitor active discharge system and a vehicle controller, and the system uses a phase shift control strategy to control a high-voltage port circuit to carry out AC-DC conversion when a battery management system is powered off and the voltage of a high-voltage port capacitor is greater than a first preset voltage threshold value. And when the voltage of the high-voltage port capacitor is reduced to a first preset voltage threshold value, the bus port circuit is controlled to be short-circuited through a driving signal, so that the voltage of the high-voltage port capacitor is reduced to a second preset voltage threshold value. And a phase shift control strategy is utilized to control the high-voltage port circuit to carry out alternating current and direct current conversion, so that residual energy of the high-voltage port capacitor is discharged to the bus port circuit through the first transformer, and second-stage active discharging of the high-voltage port capacitor is realized. The system adopts a two-stage discharge strategy, so that the discharge efficiency is improved, and meanwhile, the condition that an overcurrent risk occurs on the low-voltage battery side is avoided.

This invention relates to a wideband, low-error 6-bit active vector synthesis phase shifter for phase control of radio frequency signals. It includes an orthogonal signal generator, a wideband input matching network for the I / Q branch, a variable gain amplifier for the I / Q branch, a wideband output matching network, and a shift register. The orthogonal signal generator employs an RL multiphase filter (RLPP) based on a transformer structure, reducing losses caused by capacitive loads, saving space, and implementing a two-stage cascaded structure to extend bandwidth. An electromagnetically coupled resonator is used as the input and output wideband matching network for the variable gain amplifier, effectively extending the circuit bandwidth. Furthermore, a variable gain amplifier with adjustable tail current is designed, connected to two current mirror arrays through the tail current node in a Gilbert cell structure, enabling coarse and fine phase shift control of the phase shifter, thereby improving the phase shift accuracy.

The present application relates to a kind of compact railway energy regulation complex and its control method, including the converter unit with the core of medium-frequency transformer, the magnetic field of medium-frequency transformer is to the decoupling inductance of collision and filter capacitor and is constituted the second harmonic filter branch of converter unit DC side, filter each converter unit DC side in single-phase conversion system The second harmonic component is removed.Compact railway energy regulation complex uses double-phase shift control and passive control etc.Control method, can accurately control the power flow distribution of two power supply arms and realize traction transformer primary side three-phase current balance control, and using the linear quadratic regulator LQRI control method based on band integration is carried out energy comprehensive regulation, can effectively suppress the voltage fluctuation of feeder side, improve the comprehensive energy utilization rate and new energy consumption rate of electric railway system.Because of the existence of medium-frequency transformer, compared with the electric energy regulation device with the basic topology of traditional railway power regulator, compact railway energy regulation complex has higher integration.