636 results about "Resonant converter" patented technology

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

A reconfigurable flying capacitor multilevel input stage accepts a wide range of input voltages. The input stage divides and inverts a DC input voltage. Generally, output voltage regulation is achieved by adjusting the power switches' duty ratio in the input stage for non-resonant converters and by adjusting the switching frequency for resonant converters.

The present invention provides a topology, method and system for bi-directional power conversion of excitation power supply for power battery testing, wherein the topology comprises a three-phase PWM (pulse width modulation) converter, a high-frequency isolation three-level LLC (logical link control) resonant converter and a DC-DC (direct current) converter forming a topology structure for a three-stage power conversion; an input end of the three-phase PWM converter is connected to a power grid side; the high-frequency isolation three-level LLC resonant converter is connected between the three-phase PWM converter and the DC-DC converter in series and is configured for realizing bi-directional DC voltage conversion and isolation, and to raise a busbar voltage between the high-frequency isolation three-level LLC resonant converter and the DC-DC converter; and, the DC-DC converter is configured to generate charging and discharging excitation currents for a power battery testing.

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 5G base station optical storage integrated power supply control system, and relates to the field of 5G base station optical storage integrated power supply control, and the system comprises a detection module which detects the output voltage of a photovoltaic array, the SOC of an energy storage battery and the impedance parameter of a DC bus, and obtains a detection result; and the 5G wireless sensing module monitors reference signal receiving power and channel state information by initializing a 5GNR physical layer chip based on a detection result, transmits the reference signal receiving power to the micro-control unit through an SPI interface, and reads the maximum power point voltage and current of the photovoltaic module to obtain a time sequence and a photovoltaic array. According to the method, the Lyapunov exponent is solved through phase-space reconstruction and the Wolf algorithm, the chaos state flag bit and the load impedance are generated, the parameters of the LLC resonant converter are dynamically matched, the nonlinear dynamics theory is applied to the field of power supply control, the working modes can be adaptively switched through intelligent recognition and utilization of chaos features, and the power supply efficiency is improved. And optimal scheduling of energy is realized while the ZVS state is ensured.

The invention belongs to the technical field of LLC resonant converters, and provides an efficiency optimization method of a wide-range LLC resonant converter. The method comprises the following steps: firstly, obtaining a full-bridge LLC resonant converter topology and a working area; secondly, establishing a full-time-domain equation of the full-bridge LLC resonant converter topology in an inductive low-gain output working area, and setting boundary conditions of the full-time-domain equation; then, on the basis of boundary conditions, switching tube turn-off current is calculated, and the switching tube turn-off current is combined with switching tube switching frequency to be represented as switching tube turn-off loss characteristic quantity related to the inductance coefficient, the quality factor and the normalized frequency; then, carrying out characteristic analysis on the turn-off current of the switching tube, and setting constraint conditions; and finally, on the basis of the set constraint conditions, the optimal values of the inductance coefficient, the quality factor and the normalized frequency are calculated by combining a differential evolution algorithm, so that the turn-off loss of the switching tube is minimum. According to the invention, the transmission efficiency in a low-gain mode and a high-gain mode can be improved, and the turn-off loss of the switching tube is reduced.

A control method and system for a resonant converter. The control method for a resonant converter comprises: in each switching cycle, determining a target power value on the basis of an input power control amount and a compensation amount corresponding to a bridge leg (S101); on the basis of the target power value, an input voltage, circuit parameters of the resonant converter, and the current operating mode of a full-bridge inverter module, determining a target slope control amount corresponding to a counter which corresponds to a switching transistor (S102); determining a comparison threshold on the basis of the target slope control amount, the current count value of the counter which corresponds to the switching transistor, and a DC bias voltage of a resonant capacitor corresponding to the current operating mode, wherein the counter starts counting using the DC bias voltage as an initial value in each switching cycle until the actual voltage of the resonant capacitor is equal to the comparison threshold (S103); and determining a control signal on the basis of the actual voltage of the resonant capacitor and the comparison threshold, and controlling the switching transistor on the basis of the control signal (S104).

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

The invention relates to the technical field of converters, in particular to an LLC perception type physical information nested neural network parameter estimation method suitable for an LLC resonant converter, and the method comprises the following steps: S1, constructing a continuous time state space model of the LLC resonant converter, and carrying out the discretization processing; s2, an LLC perception type physical information nested neural network is constructed, and the LLC perception type physical information nested neural network comprises a data reconstruction network and a physical information nested neural network which are connected and is used for online parameter identification of the LLC resonant converter; the data reconstruction network comprises a resonance state judgment layer, a K2 operation layer, a pseudo label generation layer, a constraint layer and a data reconstruction layer; the physical information nested neural network comprises a middle state mapping layer and a physical layer; defining LLC perception type physical information nested neural network input; s3, constructing a loss function; and S4, deploying and executing the LLC perception type physical information nested neural network model.

The invention discloses a low-loss planar transformer design method suitable for an LLC resonant converter, and the method comprises the steps: firstly collecting the index parameters of the LLC resonant converter, setting the target parameters of a planar transformer, selecting a magnetic core model meeting the requirements according to an AP method, and then carrying out the design of a winding structure, finally, modeling and simulation of the planar transformer are completed in finite element software, and if the simulation result does not meet the set parameter and loss requirements, selection of the magnetic core model and design of the winding structure need to be conducted again; and if the set parameters and the loss requirements are met, finishing the design.

A resonant converter having a switch on-time control mechanism is provided. The resonant converter includes a primary-side switch circuit, a primary-side resonant circuit, a secondary-side switch circuit, a secondary-side resonant circuit, a transformer and a control circuit. In the resonant converter, the control circuit controls on-times and switching frequencies of the primary-side switch circuit and the secondary-side switch circuit to extend time within which power is transmitted from an input power source, the primary-side switch circuit, the primary-side resonant circuit and the transformer to the secondary-side resonant circuit, and stored in the secondary-side resonant circuit. As a result, the secondary-side resonant circuit is able to supply more power to a load.

A single-stage AC-to-DC resonant converter is used to convert a three-phase AC power source into a DC power source. The single-stage AC-to-DC resonant converter includes a primary-side circuit, a resonant circuit, and a secondary-side circuit. The primary-side circuit includes three primary-side switch circuits, and each primary-side switch circuit is coupled to one phase of the three-phase AC power source. The resonant circuit includes three transformers, and primary-side windings of the transformers are respectively coupled to the primary-side switch circuits, and secondary-side windings of the transformers are coupled to the secondary-side circuit.

The application discloses a resonant converter and a method for controlling the same. The resonant converter includes: a resonant tank, a first circuit electrically connected to a first end of the resonant tank, and a second circuit electrically connected to a second end of the resonant tank; the first circuit including at least one primary switch, the second circuit including at least one controllable switch, and controlling the at least one controllable switch according to a secondary initial switching frequency, such that the second circuit outputs power, adjusting a secondary switching frequency of the at least one controllable switch according to the secondary initial switching frequency and a signal reflecting the power of the second circuit, such that the secondary switching frequency of the second circuit follows a primary switching frequency of the first circuit.

The invention discloses a power control method and device for an industrial forklift charger, and the method comprises the steps: obtaining industrial forklift charging demand data and LLC resonant topology characteristic parameters, and constructing an LLC resonant converter; on the basis of the working frequency range and the power density requirement, through a probability learning algorithm and a random agent model, a random agent model for multi-objective optimization of magnetic element parameters is formed, and a high-frequency low-loss magnetic element is obtained; a high-frequency low-loss magnetic element is integrated into an LLC resonant converter, a random neural control barrier function algorithm is realized, and dynamic power control is performed on a charging process; based on the real-time data, a data-driven hybrid prediction control strategy is realized, and a charging parameter optimization instruction is generated; and in combination with the battery charge and discharge characteristic data and the battery aging state evaluation model, battery state evaluation and charging parameter adaptive adjustment are realized. The problems that a traditional charger is insufficient in control precision, low in efficiency, short in battery life and the like in a complex industrial environment are solved.

The invention discloses a switching control method based on SPWM soft start and a pulse type load LLC resonant converter. The converter mainly comprises an LLC resonant converter, an H-bridge inverter circuit and a load of the H-bridge inverter circuit, and the control method comprises the following steps: setting k-level SPWM modulation in a starting stage to realize smooth soft start of output voltage (k is any positive integer); the load state is accurately judged through an H-bridge switching logic unit, and Burst intermittent control and linear frequency control are adopted for no-load and full-load in a steady state respectively; during load switching, a nonlinear SOTC optimal trajectory controller is adopted to perform two-pulse optimal control, so that the state is transited to a new mode along the shortest trajectory, and a dynamic response optimizer is introduced to compensate the switched frequency according to the state radius error so as to suppress secondary voltage fluctuation. The problems of slow dynamic response, large output voltage fluctuation and the like when traditional linear control faces a pulse type load LLC resonant converter are solved, and the stability and the anti-interference capability of the output voltage of the system are improved.

The disclosure concerns a control method for operating a multi-phase converter with a number N of phases, N being at least three, said converter including a transformer, a primary side circuit which includes primary switch legs with primary switches connected to a primary side of the transformer, and a secondary side circuit which includes secondary switch legs each with at least one secondary switch connected to a secondary side of the transformer, the method including: a boost operation mode including a shorting step of shorting the secondary side circuit by controlling a plurality of secondary switches of separate secondary switch legs to be simultaneously ON, said shorting step is repeated periodically within one switching time period T; and / or a phase-modification operation mode including a phase-reduction step of reducing an operating phase of said converter by controlling all primary switches of at least one primary switch leg to be simultaneously OFF.

The invention provides a method for improving transient stability of a submarine direct-current power supply system based on frequency compensation. The method comprises the following steps: acquiring a real-time electrical parameter detection item of a first system; based on the first system real-time electrical parameter detection item, judging whether the system load power is within a power range required by a transient stable operation condition; if not, the switching frequency compensation amount of the input-series output-parallel resonant converter sub-module is calculated; based on the switching frequency compensation amount, determining a switching signal of a sub-module switching tube of the input-series output-parallel resonant converter; acquiring a real-time electrical parameter detection item of a second system; based on a second system real-time electrical parameter detection item, judging whether the system load power is within a power range required by a transient stable operation condition; if yes, conventional frequency conversion control is adopted. The technical blank in the field is effectively filled, and the stability of the submarine direct-current power supply system in the transient process is remarkably improved.

The invention relates to the field of electronic power, particularly discloses a bridge resonant converter based on forward and reverse shock coordination of double transformers, and belongs to the technical field of power electronic conversion. Aiming at the problems of over-high peak current, high magnetic core saturation risk, remarkable switching loss and the like of a traditional LLC resonant converter under the requirements of a wide load range and high power density, the invention provides the following innovative schemes: a dual-transformer forward and reverse excitation collaborative structure, a zero voltage switching (ZVS) driving technology and resonant network parameter optimization.

A DC-DC LLC resonant-converter utilizes a synchronous-rectifier stage with first and second branches. In a calibration-cycle, a first elapsed-time from commutation of a drain-to-source voltage of the first branch's transistor, through inversion of the current in the first branch, to a next zero-crossing of that current is measured, and a second elapsed-time is measured the same way for the second branch. In a normal operating-cycle thereafter, turn-on of the first branch's transistor with respect to commutation of its drain-to-source voltage is delayed by the first elapsed-time, and turn-on of the second branch's transistor with respect to commutation of its drain-to-source voltage is delayed by the second elapsed-time. The first branch's transistor is turned-off in response to change in slope of a drain-to-source voltage of the second branch's transistor, and the second branch's transistor is turned-off in response to change in slope of a drain-to-source voltage of the first branch's transistor.

The invention discloses a circuit topology design method for a single-stage AC-DC converter, and relates to the technical field of power supply systems, and a totem-pole bridgeless Boost power factor correction circuit and an LCC half-bridge resonant converter with current-doubling synchronous rectification are integrated together through a switching tube sharing technology. Wherein the totem pole bridgeless Boost power factor correction PFC circuit comprises vin, Lf, Cb, two diodes D1 and D2, and two MOS switch tubes S1 and S2; the front stage of the LCC half-bridge resonant converter comprises two MOS switch tubes S1 and S2, a series resonant capacitor Cr, a parallel resonant capacitor Cp and a series resonant inductor Ls. The single-stage AC-DC converter circuit topology provided by the invention has the advantages that the preceding stage only needs one set of controller, the control logic is simple, the number of used electronic components is small, the cost is low, the efficiency is high and the reliability is high; and the backward stage is provided with the current-doubling synchronous rectification circuit, so that the single-stage AC-DC converter circuit topology has the advantages of being high in efficiency, small in loss and suitable for a large-current output occasion.

An adaptive synchronous rectification control method for a CLLLC resonant converter solves the problem of the relatively complex theoretical calculation process for synchronous rectification of a CLLLC resonant converter, and belongs to the field of CLLLC resonant converter control. Based on the circuit characteristics and operating process of the CLLLC converter, the present invention analyzes the influence of the converter's synchronous rectification drive signal on the output frequency of the converter when the converter outputs a stable output signal, derives an equation for the relationship between the change in the synchronous rectification signal and the change in the operating frequency near the ideal synchronous rectification signal, and utilizes the law of this equation to implement the synchronous rectification function of the CLLLC converter. In the rectification control, a certain disturbance signal is given to the synchronous rectification signal, and then the synchronous rectification signal of the converter is gradually brought closer to the ideal synchronous rectification state based on the change in the operating frequency before and after the converter reaches a stable output signal. The present invention does not require additional sensors and avoids complex theoretical calculations.

The application discloses a construction hoist brake holding control system and belongs to the technical field of intelligent control, which comprises a 380V power supply, an LLC resonant converter, a brake holding control circuit, an LLC control circuit and an MCU control circuit, wherein the LLC resonant converter comprises an EMC circuit, a front-stage rectification filter circuit, an LLC resonant circuit and a full-bridge rectification filter circuit. The main topology scheme adopted by the application is an LLC resonant converter plus double-path IGBT control plus output voltage and current detection scheme. The LLC converts the alternating voltage of 380V into the direct voltage of 195V+ / -15V, and then the voltage is output to the brake holding for power supply through the control of IGBT. Voltage detection and current detection circuits are added in the whole output loop. In the working process, the MCU can monitor the brake holding logic, detect the output voltage and current, and judge whether the brake holding has faults such as short circuit, open circuit, overload, overcurrent, overvoltage, undervoltage, unstable output voltage, IGBT through and the like.

The invention provides a parameter design method for a multi-voltage rectification LCC converter, and the method comprises the steps: building a voltage precise mathematical model of a resonant cavity parallel capacitor through employing a fundamental wave equivalent method based on the condition that output capacitors of the multi-voltage rectification LCC converter and a multi-voltage rectifier participate in resonance; the gain of the voltage-multiplying LCC resonant converter is modeled through a voltage accurate mathematical model of a resonant cavity shunt capacitor; determining the number of rectifier bridges, the turn ratio of a transformer and the capacitance value of a rectification voltage-multiplying capacitor according to the voltage of the parallel capacitor of the resonant cavity and the gain of the voltage-multiplying LCC resonant converter; and determining values of the resonant cavity series-parallel capacitor and the resonant cavity inductor according to the capacitance value of the rectification voltage-multiplying capacitor. According to the method, analysis and calculation of the output filter capacitance are incorporated into parameter design of accurate modeling, a scheme for selecting the number of the voltage doubling rectifier bridges is given, and the size can be reduced and economic benefits can be increased under the condition that working condition requirements are met.

The invention discloses an electric vehicle reverse charging method and device based on vehicle network interaction and a medium, and relates to the technical field of electric vehicles. The method comprises the following steps: after a power receiving vehicle and a power supply vehicle establish physical connection through a charging gun and a charging pile, the charging pile sends a session establishment request message to the power receiving vehicle to request a digital certificate of the power receiving vehicle and perform identity authentication; the power supply vehicle broadcasts battery state information through the charging pile; wherein the battery state information comprises battery capacity, residual electric quantity and dischargeable power; the powered vehicle sends a charging parameter discovery response message to the power supply vehicle through the charging pile according to own requirements; wherein the charging parameter discovery response message comprises a target charging parameter; and converting the battery output voltage of the power supply vehicle into the charging voltage required by the power receiving vehicle through the LLC resonant converter based on the target charging parameter which is consistent through negotiation.

The invention relates to the technical field of switching power supplies, and discloses a bilateral modulation control method capable of realizing reverse operation of an LLC resonant converter of a ZCS. Comprising the following steps: deducing time domain expressions of converter operation stages Pr and Or under the influence of parasitic inductance Ls, calculating by using a time domain model to obtain zero current turn-off of a primary side switch of the converter in a full working frequency and load range, and designing a bilateral modulation controller. According to the method, zero-current turn-off of a primary side switching tube is realized; from the perspective of a steady-state simulation waveform, the turn-off current error is less than 1A, so that the switching loss is effectively reduced, the energy loss of the converter in the reverse operation process is reduced, and the overall operation efficiency is further improved; the voltage peak of a primary side switching tube can be reduced; by reducing the voltage spike, the risk that the switch tube is damaged due to overvoltage is reduced, the operation safety and stability of the converter are improved, and reliable operation of the whole system is guaranteed.

The invention provides a light load control method, an LLC resonant converter using the same and a storage medium, the method is based on a double closed-loop control structure of a voltage outer loop and a current inner loop, different load conditions are adapted by automatically switching a PFM mode, a PWM mode and a BURST mode, and the method comprises the following steps: setting control parameters; sampling an output voltage Vout and an output current Iout of the LLC resonant circuit; inputting a voltage error obtained by comparing a preset reference voltage Vref with the output voltage Vout into a PI controller of a voltage outer loop, and calculating to obtain a reference current Iref; a current error obtained by comparing the reference current Iref output by the voltage outer loop with the output current Iout is input into a PI controller of the current inner loop; and judging the working mode of the current control period according to the duty ratio Duty of the previous control period and the frequency demand f output by the current inner loop. According to the invention, through combination of double closed-loop control and three-mode intelligent switching, comprehensive optimization of efficiency, dynamic response and output voltage quality in a full-load range is realized.

The invention relates to a resonant converter, which comprises a primary side switch circuit; the resonant cavity comprises a transformer, a primary winding and a secondary winding, and the primary winding is electrically connected to the primary switching circuit; the secondary side switching circuit is electrically connected to the secondary side winding and comprises a first switching bridge arm and a second switching bridge arm, and a phase shift angle exists between the first switching bridge arm and the second switching bridge arm; wherein secondary side current flowing through the secondary side winding selectively works in a forced continuous conduction mode, a continuous conduction mode or a critical conduction mode according to the operation of the primary side switching circuit and the secondary side switching circuit; and the control circuit is used for adjusting the switching frequency and the phase shift angle of the primary side switching circuit and the secondary side switching circuit when the secondary side current flowing through the secondary side winding works in a forced continuous conduction mode or a continuous conduction mode, so that the secondary side current flowing through the secondary side winding is gradually adjusted to work in a critical conduction mode. And the actual voltage gain value of the resonant converter is controlled at the default voltage gain value.

The invention provides a high-power rectification resonance control method and system for a quick charger, relates to the technical field of rectification resonance, and aims to obtain direct-current bus voltage, adjust output power through frequency modulation of a full-bridge LLC resonant converter, and perform voltage stability control adjustment in combination with feedback current data. Charging curve data analysis is carried out to acquire charging key nodes and resonance frequency nodes, device state data acquisition and analysis are carried out, a frequency conversion control loop is constructed, resonance frequency adjustment is carried out, after adjustment is completed, abnormal nodes are identified and combined analysis is carried out, optimal parameters of each load segment are acquired, and voltage fluctuation data are acquired. The method comprises the steps of carrying out fluctuation influence analysis, carrying out fluctuation suppression by adjusting a switching frequency and phase shift angle combination of a full-bridge LLC resonant converter, carrying out calculation through the full-bridge LLC resonant converter to obtain an equivalent voltage control instruction, carrying out mode buffer switching and obtaining mode control switching data, and realizing rectification resonance accurate control of the charger.

A power converter can include a switching bridge having two input terminals that receive an input voltage and a switch node coupled to a primary winding of a transformer; at least one rectifier device coupled between a secondary winding of the transformer and an output of the power converter; and a common mode noise compensation capacitor. A first terminal of the common mode noise compensation capacitor can be coupled to a connection between the secondary winding of the transformer and the at least one rectifier device, and a second terminal of the common mode noise compensation capacitor can be coupled to one of the two input terminals. The common mode noise compensation capacitor can be coupled to an energized or a grounded input terminal. The common mode noise compensation capacitance can be selected to be equal to the turns ratio of the transformer times the parasitic capacitance of the transformer.