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1084 results about "Resonant converter" patented technology

A resonant converter is a type of electric power converter that contains a network of inductors and capacitors called a "resonant tank", tuned to resonate at a specific frequency. They find applications in electronics, in integrated circuits.

Multi-phase LLC resonant converter circuit

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.
Owner:GS YUASA INT LTD

High-power all-gallium nitride LED driving power supply circuit

The invention discloses a high-power all-gallium nitride LED driving power supply circuit which comprises an EMI filtering and rectifying circuit, a GaN active power factor correction circuit, a GaN half-bridge LLC resonant converter circuit and a GaN synchronous rectifying and filtering circuit. The PFC and LLC combined control module integrates a power factor correction function and a resonance circuit frequency regulation function, the GaN active power factor correction circuit is connected with the PFC and LLC combined control module to realize power factor correction, and the GaN half-bridge LLC resonant converter circuit is connected with the PFC and LLC combined control module to realize output power regulation; and a constant-current voltage-limiting feedback circuit for outputting current and voltage detection feedback is arranged between the GaN synchronous rectification filter circuit and the PFC and LLC combined control module. The advantages of high efficiency of the GaN switching tube and high working frequency of the circuit are utilized, so that power loss and heat dissipation requirements are reduced, and the efficiency and power density of the LED power supply are improved. The invention has the advantages of high efficiency, high power density, high reliability and the like.
Owner:NANCHANG UNIV +2

Intelligent charging pile control system and method based on dynamic power distribution

The invention belongs to the technical field of charging pile control, and particularly relates to an intelligent charging pile control system and method based on dynamic power distribution, and the method comprises the steps: a slave control board collects battery data in real time, and uploads the battery data to a main control board; the main control board receives the battery data, predicts the maximum allowable charging power of the battery through an LSTM model, and determines the safety boundary of the battery according to the maximum allowable charging power and the safety operation parameters of the battery; generating a power distribution strategy by adopting a Nash equilibrium algorithm based on the battery safety boundary in combination with the power grid load and the user priority; issuing the power distribution strategy to an intelligent charging module; the intelligent charging module adjusts the switching frequency of the LLC resonant converter based on the power distribution strategy to realize target power output; the intelligent charging module monitors output current, voltage and temperature in real time and feeds back monitoring data to the main control board to form closed-loop control. And flexible control and data feedback of the charging module are realized.
Owner:SHANDONG ARTAPLAY INTELLIGENT TECH CO LTD

Resonant converter switching between different operational state modes

A resonant converter switching between different operational state modes is provided. The resonant converter includes a first transistor, a second transistor, a control circuit, a resonant circuit, a transformer and an output stage circuit. A first terminal of the first transistor and a second terminal of the second transistor are connected to positive and negative terminals of an input voltage source, respectively. A first terminal of the second transistor is connected to a second terminal of the first transistor. The resonant circuit is connected to the second terminal of the first transistor and the transformer. The transformer is connected to a load through the output stage circuit. The control circuit modulates frequencies or duty cycles of conduction time control signals that are outputted to the first and second transistors to different values for switching the resonant converter between the operational state modes.
Owner:NAT TAIWAN UNIV OF SCI & TECH

Power conversion device

In a power conversion device, a control circuit sets an output voltage of a boost converter to a first output voltage level or a second output voltage level in accordance with a voltage corresponding to the input voltage, causes an electric current resonant converter to operate in a full-bridge mode as an operating mode when the first output voltage level has been set, and causes the electric current resonant converter to operate in a half-bridge mode as an operating mode when the second output voltage level has been set. The first output voltage level or the second output voltage level is set at a predetermined timing after the input voltage is input and a set operating mode is maintained until a process of setting the first output voltage level or the second output voltage level is reset.
Owner:TDK CORP

Resonant converter capable of adaptively tuning quality factor based on load

Provided is a resonant converter capable of adaptively tuning a quality factor based on load. The resonant converter includes a resonant tank having an inductor part whose inductance is tunable according to a first control potential, a magnetizing inductor, and a capacitor part whose capacitance is tunable according to a second control potential. The resonant converter detects the rectifying current of its output stage for responding to the load state of the resonant converter. The resonant converter outputs the first and second control potentials in response to the load state, tuning the equivalent inductance of the inductor part, the equivalent capacitance of the capacitor part, or both, thereby changing the quality factor of the resonant converter.
Owner:ACER INC

Power converter topology

A power converter topology, comprising: a cascade connection of a first converter stage and a second converter stage; wherein the first converter stage comprises a current mode controlled pulse width modulation (PWM) converter having one or more pairs of switches forming a first switching bridge and an inductor connected to the output of the first switching bridge, the switching bridge generating a voltage Vlink; and wherein the second converter stage is a resonant converter having a switching stage having one or more pairs of switches forming a second switching bridge across the voltage Vlink generated by the first converter stage and a resonant tank connected to the output of the second switching bridge, to generate a resonator output voltage; the topology further comprising a transformer to transform the resonator output voltage to a transformed output voltage and a rectifier to rectify the transformed output voltage to an output voltage Vout, and wherein the duty cycle of the first switching bridge is varied according to a voltage derived from the value of the output voltage Vout, and wherein the duty cycle of the second switching bridge is fixed at 50:50.
Owner:HAMILTON SUNDSTRAND CORP

Wide-gain multi-mode bidirectional CLLLC resonant converter and segmented hybrid modulation method thereof

The invention discloses a wide-gain multi-mode bidirectional CLLLC resonant converter and a segmented hybrid modulation method thereof, and belongs to the technical field of power electronic conversion devices. The wide-gain multi-mode bidirectional CLLLC resonant converter is designed, the advantages of two modulation strategies of PFM and PSPSM in different working states are combined, an over-resonance part modulated by the PFM is replaced by a quasi-resonance part modulated by the PSPSM, the converter is prevented from running in an over-resonance state, the control targets of wide voltage gain and high efficiency are considered, and the wide-gain multi-mode bidirectional CLLLC resonant converter has the advantages of being scientific, reasonable, low in cost and the like. The applicability is high, and the effect is good. The wide-gain multi-mode bidirectional CLLLC resonant converter is small in size, low in cost and reasonable in structure. The PFM + PSPSM segmented hybrid modulation method effectively widens the voltage gain of the converter, is scientific and reasonable, has strong applicability and prominent effect, and is suitable for application scenes of various working conditions.
Owner:NORTHEAST DIANLI UNIVERSITY

Fault-tolerant control method and system for dual-active-bridge series resonant converter

The invention provides a fault-tolerant control method and a fault-tolerant control system for a dual-active bridge series resonant converter (DBSRC), and aims to solve the problems that the voltage and current stress is increased, the system reliability is reduced and the like caused by an open-circuit fault of a primary side switch tube or a secondary side switch tube. Through the dynamic reconstruction modulation strategy and the same bridge arm driving follow current suppression method, under the condition that redundant hardware is not needed, the voltage and current stress in the fault state is effectively reduced, and stable operation of the system is maintained. The method specifically comprises the following steps: when a primary side open-circuit fault occurs, optimizing a control parameter by adopting extended phase shift modulation (EPS), and compensating for loss of a power transmission path; and when the secondary side has an open-circuit fault, the driving signal of the other switching tube of the same bridge arm is cut off, and the direct-current bias of the resonance current is eliminated. According to the method, the fault-tolerant capability of the DBSRC is remarkably improved, the hardware cost and the maintenance complexity are reduced, and the method is suitable for a high-frequency isolation direct-current conversion system.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Input stage for a power converter

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.
Owner:REGENTS OF THE UNIVERSITY OF MINNESOTA

Frequency modulation and phase shift hybrid modulation method of high-frequency LLC (Logical Link Control) and related device

The invention provides a frequency modulation and phase shift hybrid modulation method for high-frequency LLC and a related device, which are applied to an LLC resonant converter and comprise the following steps: setting initial parameters of the LLC resonant converter; different system working frequencies are selected; for each system working frequency, determining a required phase shift angle according to a load demand and the system working frequency; and then judging whether the gain of the converter can meet the load requirement under the phase-shifting angle and the frequency, if not, adjusting the phase-shifting angle until the load requirement is met, and if so, taking the phase-shifting angle as a parameter combination. And then calculating system loss under parameter combinations corresponding to different frequencies, and finally selecting the combination with the minimum loss as a modulation parameter basis. The phase shift control is added on the basis of the traditional frequency modulation strategy, the output voltage can be accurately controlled without changing the topology of the converter, the influence of a dead zone under high frequency on the system is reduced, the optimal working point is determined through the balanced frequency modulation and phase shift strategy, the system loss is minimized, and the operation efficiency is improved.
Owner:ELECTRIC POWER RES INST CHINA SOUTHERN POWER GRID CO LTD +1

Bidirectional power conversion topology for power battery test excitation power supply, method and system

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.
Owner:SHANDONG UNIV

Full-bridge LLC resonant converter control circuit

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.
Owner:MAINTENANCE BRANCH OF STATE GRID CHONGQING ELECTRIC POWER

Charge control method and digital control system based on dual active bridge resonant converter

The invention discloses a charge control method and a digital control system based on a dual-active bridge resonant converter, and belongs to the technical field of dual-active bridge resonant converter control. According to the method, a resettable integrating circuit is used for sampling resonance current and converting the resonance current into integrating voltage which is in a linear relation with charge injection quantity, and an integrating capacitor is discharged and reset before each time of injection; superposing the integral voltage and the ramp voltage; comparing the superposed signal with a threshold voltage output by a current loop through a comparator, and when the superposed signal reaches a threshold value, triggering to generate a PWM signal and switching the working mode of the converter; a switching tube is controlled to act according to a PWM signal, a switching time sequence is dynamically adjusted, effective control over transmission power is achieved, and a digital control system for achieving the method is established. According to the method, rapid dynamic response, efficient power transmission and stable operation of the dual-active bridge resonant converter are realized by controlling resonance current integration and a switching time sequence, and the energy conversion efficiency and the system reliability are effectively improved.
Owner:NANJING NORMAL UNIVERSITY

5G base station optical storage integrated power supply control system

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.
Owner:ANHUI ZHONGTE NEW ENERGY TECHNOLOGY CO LTD

Efficiency optimization method for wide-range LLC resonant converter

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.
Owner:NANJING INST OF RAILWAY TECH

Control method and system for resonant converter

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).
Owner:SHANGHAI CHINT POWER SYST CO LTD

Novel difference fixed-frequency boost control method suitable for resonant transformation topology

The invention discloses a novel difference fixed-frequency boost control method suitable for resonant transformation topology, and relates to the technical field of resonant converter wide-range fixed-frequency boost control. According to the method, the switching frequency of a switching tube of a rectifier full bridge is set to be half of the switching frequency of a switching tube of an inverter side full bridge, the switching frequency of the inverter side full bridge is rated resonant frequency, a half-cycle feedback current circuit is formed, the feedback energy time is adjusted by controlling the PWM proportion of a single tube, and the output voltage of the converter is pumped up. Soft switching characteristics of part of switching tubes are inherited, wide gain of the converter on a rated frequency point can be guaranteed, the situation that tube section current is too high due to the fact that traditional frequency conversion control is in a wide under-resonance interval or a low inductance ratio is avoided, meanwhile, the problem that soft switching cannot be achieved in phase-shifting control is also avoided, and the control efficiency of the converter is improved. Meanwhile, over-wide frequency range adjustment is avoided for high-frequency application, convenience is brought to design of magnetic elements, and certain high-frequency and high-power-density application potential is achieved.
Owner:QINHUANGDAO POWER SUPPLY COMPANY OF STATE GRID JIBEI ELECTRIC POWER COMPANY

LLC resonance parameter forward design method, device, equipment, medium and program product

The invention discloses an LLC resonance parameter forward design method, device and equipment, a medium and a program product, and the method comprises the steps: constructing a resonance mathematical model according to the information of elements participating in resonance in an LLC resonant converter, constructing a phase plane model of the LLC resonant converter based on the resonance mathematical model, constructing a target function according to the phase plane model, and carrying out the forward design of the LLC resonance parameter. Calculating state trajectory parameters based on the objective function, and performing parameter design on the LLC resonant converter according to the state trajectory parameters; according to the LLC resonant converter, the phase plane model of the LLC resonant converter is constructed, so that the state track simulation of the LLC resonant cavity is realized, the design of the LLC resonant parameters is realized through the coordinates of the state points on the phase plane, the parameter design complexity of the converter is effectively reduced, the parameter design efficiency is improved, and the performance of the LLC resonant converter is effectively improved.
Owner:HUNAN UNIV

Magnetic integration optimization design method based on LLC resonant converter

The invention provides a magnetic integration optimization design method for an LLC resonant converter, and belongs to the technical field of power electronics. The integrated magnetic core structure comprises a magnetic core base with four winding magnetic columns and a top cover plate, and the magnetic integration method reduces the number and the size of magnetic elements and reduces the height of the magnetic elements. According to the magnetic core structure, the magnetic flux density is uniformly distributed, the magnetic core loss of the transformer is reduced, and the power density and efficiency of the transformer are improved. Primary side windings of the transformer are unevenly distributed on the four winding magnetic columns, secondary side windings of the transformer are evenly distributed on the winding magnetic columns, and leakage inductance is only generated on the primary side of the transformer due to the fact that the primary side windings of the transformer are unevenly distributed and the secondary side windings of the transformer are evenly distributed. Therefore, the generated leakage inductance is used as the resonant inductance of the LLC resonant converter, and integration of the transformer and the resonant inductance of the LLC resonant converter is realized. The magnetic integrated transformer with different transformation ratios and controllable leakage inductance can be realized by adjusting the number of turns of windings on the primary side and the secondary side of the transformer and air gaps of winding magnetic columns.
Owner:CHINA UNIV OF MINING & TECH

Bidirectional CLLC resonant converter with wide input and output voltage range

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.
Owner:JIANGNAN UNIV

Resonant converter having switch on-time control mechanism

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.
Owner:NAT TAIWAN UNIV OF SCI & TECH

Starting control circuit and resonant converter

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.
Owner:MERAKI INTEGRATED CIRCUIT (SHENZHEN) TECH LTD

Offshore direct-current wind turbine generator modeling method based on LLC resonant converter

The invention discloses an offshore direct-current wind turbine generator modeling method based on an LLC resonant converter. The method comprises the following steps: establishing an offshore direct-current wind turbine generator pneumatic mechanical model; the method comprises the following steps: establishing an offshore direct current wind turbine generator converter model which comprises a DC / DC converter model which adopts an LLC resonant converter; establishing a seaborne direct current wind turbine generator controller model; and establishing an external DC power grid model. And the offshore direct-current wind turbine generator controller model transmits a control signal to the offshore direct-current wind turbine generator pneumatic mechanical model and the offshore direct-current wind turbine generator generator converter model. According to the method, the electromagnetic transient simulation model of the offshore direct-current wind turbine generator based on the LLC resonant converter, which reflects actual operation characteristics, can be established, and a reliable model basis is provided for simulation calculation of an offshore wind power access power grid.
Owner:NANJING UNIV OF SCI & TECH +1

Front and rear stage collaborative optimization control method for vehicle-mounted V2G bidirectional converter

The invention discloses a front-stage and back-stage collaborative optimization control method for a vehicle-mounted V2G bidirectional converter, and relates to the technical field of vehicle-mounted bidirectional converter control. According to the invention, a front-stage totem-pole bridgeless PFC double-closed-loop controller and a rear-stage CLLC resonant converter double-closed-loop controller are designed; secondly, establishing a system joint model, reflecting the dynamic behavior of the bus voltage in the charging and discharging process, designing a corresponding bus voltage optimization method, and adopting an improved particle swarm optimization (IPSO) algorithm to optimize the parameters of a front-stage controller and a rear-stage controller by using a comprehensive cost function in the bus voltage optimization method; and the prediction step length and the weight parameter of the MPC link and the gain of the PI link are optimized in real time, so that the front-stage and rear-stage double-closed-loop control strategy can be more flexible and reliable in application. Through the innovation, the system can adapt to different working conditions in real time, front-stage and back-stage collaborative optimization control is achieved, the overall energy transmission efficiency is improved, and energy loss is remarkably reduced.
Owner:LANZHOU JIAOTONG UNIV +2

Control method for resonant converter and resonant converter

The present disclosure provides a control method for a resonant converter and a resonant converter, and relates to the technical field of resonant converters. The resonant converter includes a primary side switch and a corresponding rectification switch, the primary side switch is controlled by a first control signal, the rectification switch is controlled by a second control signal, and the method includes: acquiring a voltage difference value, where the voltage difference value is obtained by subtracting a voltage value of an output voltage of the resonant converter from a reference voltage value; and adjusting a turn-on dead time and / or a turn-off dead time between the first control signal and the second control signal according to the voltage difference value.
Owner:DELTA ELECTRONICS (SHANGHAI) CO LTD

High-voltage power supply with high stability and high dynamic performance

The invention belongs to the technical field of power electronics, and particularly discloses a high-stability and high-dynamic-performance high-voltage power supply which comprises a main circuit, a detection circuit and a control circuit. The main circuit comprises a first LCC resonant converter module, a second LCC resonant converter module and a follow current resistor; the control circuit is used for taking the output voltage of the n LCC resonant converter sub-modules as a control quantity and changing the driving signal frequency, phase and duty ratio of the LCC resonant converter sub-modules; and the driving signal frequency, the phase and the duty ratio of the second LCC resonant converter module are obtained according to the driving signal frequency, the phase and the duty ratio of the n LCC resonant converter sub-modules, so that the output voltage amplitude of the second LCC resonant converter module is equal to the output voltage ripple amplitude of the first LCC resonant converter module. The high stability of the output voltage can be ensured while the response speed of the output voltage can be greatly improved.
Owner:HUAZHONG UNIV OF SCI & TECH

Isolation bidirectional converter low switching loss unipolar control method

The invention discloses a low-switching-loss unipolar control method for an isolated bidirectional converter. The converter is composed of a direct-current source 1, a primary side full-bridge circuit, a transformer, a series resonance circuit, a secondary side full-bridge circuit and a direct-current source 2. According to the control method, the converter can always work at the resonant frequency point of the series resonant circuit, and bidirectional energy regulation and control can be realized only by adjusting the duty ratio of the switching tubes of the primary side full-bridge circuit and the secondary side full-bridge circuit; in addition, the input and output voltage relation of the resonant converter can be independent of the size and direction of the transmitted power, the bidirectional power rapid regulation and control capability is achieved, the large turn-off current brought by PWM modulation can be effectively reduced by adopting the control method, the average switching frequency in one switching period is reduced, the switching loss is further greatly reduced, and the switching efficiency is improved. The power transmission efficiency is improved, and the device is especially suitable for the technical field of high-performance bidirectional electric energy conversion of energy storage, electric automobiles, new energy and the like.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Intelligent variable inductor and LLC resonant converter based on magnetorheological material

A smart variable inductor based on magnetorheological materials comprises an "EE"-shaped iron core, two DC control coils, one AC coil, and a magnetorheological material gap. The magnetorheological material gap is located on the central column of the "EE"-shaped iron core. The two DC control coils and the AC coil are wound around the two side columns and the central column of the "EE"-shaped iron core, respectively. By controlling the DC current in the DC control coil, the magnetic saturation of the side columns can be changed, thus achieving intelligent wide-range adjustment of the inductance of the AC coil. The beneficial effects of this patent are: the provided smart variable inductor based on magnetorheological materials, due to the higher permeability of magnetorheological materials than air, which decreases with increasing magnetic field strength, has advantages such as a wide inductance adjustment range and low diffusion flux. When used in LLC resonant converters, it can achieve intelligent wide-range adjustment of input / output voltage and load, as well as intelligent current sharing control in multi-parallel converters.
Owner:杨玉岗

LLC perception type physical information nested neural network parameter estimation method suitable for LLC resonant converter

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.
Owner:CHONGQING UNIV