429 results about "Resonant converter" patented technology

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 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 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 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.

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 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 method for parameter calculation of a resonant converter includes steps of: (A) setting a predetermined operating condition of the resonant converter, and the predetermined operating condition includes a specific frequency range of an operating frequency of the resonant converter, (B) calculating a plurality of first resonance parameters in the specific frequency range, (C) acquiring a first resonance parameter in which a current ripple of a resonant inductor of the resonant converter is a minimum value in the plurality of first resonance parameters, (D) calculating a plurality of second resonance parameters according to the turns ratio of the first resonance parameter and the predetermined operating condition, and selecting one of the second resonance parameters as the resonance parameter.

The invention relates to the technical field of data analysis, and discloses an energy storage power supply multi-dimensional data analysis system and method. The method comprises the following steps: synchronously acquiring a battery state parameter set of an energy storage power pack and determining a corresponding working domain identifier; performing fault feature analysis on the battery state parameter set according to the working domain identifier to obtain a battery fault detection result; respectively calculating a fault isolation signal, a capacity equalization signal and a driving control signal according to the battery fault detection result; and controlling the hybrid switching circuit to cut off the fault battery connection according to the fault isolation signal, controlling the LLC resonant converter to adjust the energy distribution between the batteries according to the capacity equalization signal, and controlling the PWM driving circuit to adjust the output power of the energy storage power pack according to the driving control signal. According to the method, multi-dimensional coupling analysis of the battery state is realized, the association relationship between the rapid change characteristics and parameters of the battery under the dynamic working condition can be accurately captured, and the fault response speed and the energy management precision of the energy storage power supply are improved.

A resonant converter includes an input circuit, a first switch circuit, a resonant circuit, a voltage regulation circuit, a second switch circuit, and an output circuit. The first switch circuit is coupled to the input circuit and includes first switch units. The resonant circuit includes resonant tanks, each resonant tank includes a resonant capacitor and a resonant inductor which are coupled in series, and the resonant inductors are coupled to the output nodes of the first switch units by wye connection. The resonant capacitors are coupled to the primary side of the voltage regulation circuit by the wye connection. The second switch circuit includes second switch units and is coupled to the second switch circuit, and the input nodes of the second switch units are coupled to the secondary side of the voltage regulation circuit by delta connection. By the aforementioned arrangement, ZVS or ZCS is implemented.

The invention provides a digital control system of a symmetrical half-bridge LLC resonant converter and an implementation method, and relates to the field of DC-DC converters, the digital control system of the symmetrical half-bridge LLC resonant converter comprises an output voltage loop, an output current loop, an input voltage feed-forward module and a digital controller peripheral module; the output voltage loop and the output current loop establish a parallel competition loop structure, the input end of the input voltage feed-forward module is connected with an input voltage sample VinSense, and after a final output value LoopF of the loop control unit is compared with a frequency upper limit set value fmax, a control mode of the LLC resonant converter is switched; and the control system is connected with the digital controller peripheral module and outputs two paths of MOS tube driving signals. According to the invention, rapid automatic switching of loops under different working conditions is realized, the voltage gain range is widened, the dynamic response speed is improved, and the system stability is ensured while the loop response is improved.

The invention discloses a control method of an asymmetric CLLC resonant converter adopting mixed control of track control and PI control. PI control is adopted during steady-state operation of the asymmetric CLLC resonant converter, when input voltage fluctuation is detected, trajectory control is introduced, the frequency of the converter entering the steady state again after the input voltage fluctuation is calculated through the geometrical relationship of a state plane, and steady-state errors are eliminated through a PI controller. The method has the advantages that the combination of the state track control and the linear controller can reduce the voltage change of the output side and shorten the adjustment time when the input voltage fluctuates, so that the problem of severe fluctuation of the output voltage caused by the sudden change of the input voltage when the resonant converter operates is solved, the dynamic performance of the converter is remarkably improved, and the reliability of the converter is improved. Finally, the problems existing in the process of designing the linear controller are solved, the problem of voltage abrupt change of the input side is solved, and the requirements for rapidity and stability are met.

A multiphase LLC resonant converter of N phases (N represents an integer equal to or more than two) causes N resonant converters connected in parallel to a direct current power supply to operate with a phase difference of 360° / N. One of the resonant converters includes a lower adjustment inductor connected in parallel with primary windings of the lower conversion circuits. The one of the resonant converters includes an upper adjustment inductor connected in parallel with primary windings of upper conversion circuits. Outputs including high potential output terminals and low potential output terminals of the lower conversion circuits and the upper conversion circuits star connected at neutral points via a second resonant capacitor are connected.

In an aspect of the disclosure, an operation method, for balancing voltage of capacitors of a bridge circuit of a multi-level LLC resonant converter, includes: measuring voltages of the capacitors of the bridge circuit, an output voltage and an output current of an output load the multi-level LLC resonant converter, and an input voltage of the bridge circuit; selecting a voltage-level zone of a required output voltage of the bridge circuit according to the output voltage of the output load, and the input voltage of the bridge circuit; selecting a circuit mode, with a highest value of the required output voltage; and outputting PWM signals corresponding to the circuit mode, with a switching frequency, to switches of the plurality of capacitor-switch modules.

A resonant converter is provided. The resonant converter includes a primary circuit, an integrated transformer, a secondary circuit, a local ground, a first Y capacitor and a second Y capacitor. The primary circuit has a first positive line and a first negative line. The integrated transformer is electrically connected to the primary circuit. The secondary circuit is electrically connected to the integrated transformer and has a second positive line and a second negative line. The first Y capacitor is coupled between the local ground and the first positive line or the first negative line of the primary circuit. The second Y capacitor is coupled between the local ground and the second positive line or the second negative line of the secondary circuit. The first Y capacitor, the second Y capacitor and the local ground are configured to circulate common mode noise currents between the primary circuit and the secondary circuit.

The application relates to a bidirectional output L2C3 resonant converter, which comprises two excitation sources and a resonant cavity, wherein the excitation sources are both half-wave bridge circuits; the resonant cavity comprises a transformer, three capacitors and two inductors; the primary winding of the transformer is connected in parallel with a resonant capacitor C p 1; the same end of the primary winding of the transformer is connected with a resonant capacitor C1 and an inductor L1 in series connection; the other end of the inductor L1 is connected with the connection point of the first excitation source and two switch tubes in series connection; the same end of the secondary winding of the transformer is connected with a resonant capacitor C2; the other end of the resonant capacitor C2 is connected with the connection point of the second excitation source and two switch tubes in series connection; the leakage inductor L g of the secondary winding of the transformer is used as a resonant inductor; the other ends of the same ends of the primary and secondary windings of the transformer are respectively connected with the negative poles of the direct-current power supplies of the corresponding excitation sources. Energy bidirectional transmission and synchronous rectification are realized through a brand-new circuit topology. All active switches can realize soft switching, and the working efficiency is improved. In an open-loop control state, the output current does not change with the change of a load, and the application is suitable for a bidirectional constant current working mode.

The application provides a resonant converter and a control method and system thereof. The resonant converter comprises a controller, a resonant circuit, a first bridge arm and a second bridge arm in parallel, and a third bridge arm and a fourth bridge arm in parallel. Each of the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm comprises an upper bridge arm switch and a lower bridge arm switch in series. When the upper bridge arm switch of the third bridge arm and the lower bridge arm switch of the fourth bridge arm are turned off, a resonant inductor in the resonant circuit forms a resonant network with a junction capacitance inside each bridge arm switch in the first bridge arm and the second bridge arm. In order to break the resonant network, the controller can control the lower bridge arm switch of the first bridge arm and the upper bridge arm switch of the second bridge arm to be turned on after a first preset time length after the upper bridge arm switch of the third bridge arm and the lower bridge arm switch of the fourth arm are turned off, so that the voltage gain of the resonant converter when working in a high frequency band can be ensured to decrease with the increase of the frequency and have monotonicity, the cost is lower, and the adaptability is stronger.

A system and method for reducing common mode (CM) conducted electromagnetic interference (EMI) noise of a full bridge (FB) resonant converter is presented. The FB resonant converter comprises a bridge circuit, a transformer, a resonant cavity and a rectifier. The transformer has a primary winding and a secondary winding which are magnetically coupled, the primary winding being divided into a first primary winding segment and a second primary winding segment, respectively having winding turns P1 and P2. The resonant cavity is composed of a capacitor and an inductor and is electrically connected between the first and second primary winding segments. The secondary winding is electrically connected with the rectifier. The bridge circuit includes two or more switches with duty cycle control connected to the primary winding in series with the first and second primary winding segments.

The utility model relates to the technical field of power electronics, in particular to a drive circuit, an LLC resonant converter and power supply equipment, which comprises a front buffer drive circuit, a main drive circuit and an output current-limiting circuit, the front buffer drive circuit comprises an operational amplifier U1, the main drive circuit comprises a drive chip U2, and the output current-limiting circuit is connected with the operational amplifier U1. The input end of the operational amplifier U1 is used for receiving a driving signal, the output end of the operational amplifier U1 is connected with the input end of the driving chip U2, the output end of the driving chip U2 is connected with the input end of the output current limiting circuit, and the output end of the output current limiting circuit is used for being connected with an LLC resonant cavity. The utility model can reduce the transmission delay of the driving signal.

The invention discloses a high-power-density modular B2G converter soft switching control method, system and device and a medium, and belongs to the technical field of converter control, and the method comprises the steps: constructing a two-stage converter topological structure; a frequency conversion and phase shift mixed soft start strategy is introduced, and soft start is carried out on the two-stage converter topological structure; according to the current transmission direction of the two-stage converter topological structure, selecting a control strategy according to the current transmission direction; soft switching control operation is carried out on a front-stage unit and a rear-stage unit in the two-stage converter topological structure, so that zero-voltage switching-on of an auxiliary switching tube is realized and the zero-voltage switching-on is maintained; an auxiliary resonance circuit is introduced, zero-voltage switching-on of a high-frequency bridge arm switching tube and an auxiliary switching tube is achieved through two times of resonance, and a rear-stage unit is designed to be an isolated bidirectional symmetrical CLLLC resonance type converter topology to be matched with closed-loop frequency adjustment; during soft start, a frequency conversion and phase shift mixed strategy is adopted, system energy is smoothly established through phase shift control, and starting current impact is restrained.

The application provides a resonant converter, which comprises a half-bridge unit and a resonant unit, an input end of the resonant unit is connected in parallel with an output end of the half-bridge unit, the resonant unit comprises a first capacitor, a first inductor and a transformer, the first capacitor, the first inductor and a primary winding of the transformer are connected in series, the transformer comprises a first secondary winding and a second secondary winding, and the resonant converter further comprises a first output rectification filter unit and a second output rectification filter unit, and the output ends of the first output rectification filter unit and the second output rectification filter unit are connected in parallel to output direct current. The application combines frequency control and duty cycle control, and widens the voltage regulation rate of the resonant converter.

The invention provides a switching power supply LLC interleaving current sharing control system and method. The system comprises a switching power supply conversion circuit, a controller and a logic operation circuit. Wherein the controller is used for obtaining driving signals of a plurality of switch tubes in the first full-bridge resonant conversion branch and the second full-bridge resonant conversion branch according to an output voltage set value and an output current and voltage sampling value of the interlaced full-bridge LLC resonant converter module; the driving signal is used for controlling the working state of the switching tube so as to realize current sharing of the first full-bridge resonant conversion branch and the second full-bridge resonant conversion branch. According to the current value sampled by the two branches, the current-sharing pulse which only affects the turn-off signal of the switching tube can be generated, in the current-sharing adjusting process, the deviation of 90 degrees of MOS tube driving at the same position of the two resonant full bridges can be maintained without complex setting of a controller or addition of an additional complex circuit, and the current-sharing effect of the two resonant full bridges is improved. And a good effect of small interleaving parallel output ripple is realized.

The application relates to the technical field of power electronics, in particular to a control method of a bridgeless PFC single-stage LLC resonant converter, which comprises simultaneously collecting an output voltage and a bus voltage, respectively calculating the difference from a respective preset reference voltage, inputting the difference into independent PI controllers respectively, obtaining corresponding output frequencies respectively, then performing weighted processing on the output frequencies to obtain an actual control frequency, and generating a switching tube control signal of the converter according to the actual control frequency. The application solves the problem that a traditional single-stage converter is difficult to simultaneously ensure the stability of an output voltage and the safety of a bus voltage due to the adoption of a single control loop, effectively improves the overall performance and operation reliability of the converter under complex working conditions such as grid fluctuation and load mutation. Moreover, by integrating multiple independent magnetic elements onto a composite magnetic core, the volume, weight and component quantity of the converter are significantly reduced, so that the power density is improved and the manufacturing cost is reduced.