143 results about "H bridge" patented technology

The invention discloses an information energy equipment operation reliability evaluation method and system and electronic equipment, and relates to the field of power system reliability determination. According to the method, the Foster thermal resistance model is adopted to determine the junction temperature of the selected device in the information energy equipment, so that the average junction temperature and the junction temperature fluctuation are obtained. Adopting a Coffin-Manson-Arrhenius model to determine the number of failure cycles of the selected device based on the average junction temperature and junction temperature fluctuation so as to determine the degree of damage caused by the set number of junction temperature stress cycles; determining the fault rate of the selected device based on the damage degree, and obtaining the fault rate of the H bridge + DAB combination unit; the fault rate of the half-bridge arm can be obtained on the basis of the fault rate of the H-bridge + DAB combination unit, and the fault rate of the rectification subsystem can be accurately obtained under the condition of considering the bridge arm inductance fault rate of the half-bridge arm, so that the reliability of the digital battery energy storage system can be simply and effectively analyzed.

The invention discloses an energy storage EMS cooperative control method and system based on fault ride-through and dynamic reconstruction, and relates to the technical field of monitoring analysis, and the method comprises the steps: collecting power grid operation state parameters and energy storage system core data, and the power grid operation state parameters comprise a power grid voltage deviation value; the power grid voltage deviation value is compared with a preset threshold value, when the power grid voltage deviation value exceeds the preset threshold value, a multi-energy cooperative power distribution strategy is started, power support is provided, in the power support process, the series-parallel topology of the energy storage system is dynamically reconstructed through the IGBT matrix switch group, and after dynamic reconstruction, the power support is provided for the energy storage system. The DC link voltage is adjusted through the H-bridge converter group; and in the fault recovery stage, monitoring the recovery condition of the operation state parameters of the power grid, and when the voltage deviation of the power grid is within a normal range, gradually reducing the power support strength, and switching to a conventional operation mode according to a preset sequence to realize the cooperative control of the energy storage EMS. The method has the effect of improving the cooperative control efficiency.

The invention relates to an adjustable manual zero-crossing loop topology for assisting on-off of a direct-current circuit breaker. The pulse current can be flexibly adjusted under the working condition that the current amplitude of a main loop changes greatly, so that the on-off operation of the circuit breaker is assisted. The topological structure comprises a thyristor H bridge for controlling the current direction, and a discharge branch circuit connected in parallel at two ends of a direct current circuit breaker, wherein the branch circuit is formed by connecting a plurality of groups of capacitors and reactors in parallel. In the on-off process of the direct-current circuit breaker, the corresponding thyristors and the discharge switches are controlled to be switched on according to the amplitude of current in a main loop, the capacitor releases charges, and pulse current opposite to the current in the main circuit is generated through the electric reactor, so that the direct-current circuit breaker is assisted to complete on-off operation. According to the topological structure, the number of the input capacitors can be selected according to the amplitude of the main loop current, so that the reverse current matched with the main loop current is generated, and the switching-on and switching-off success rate of the circuit breaker is improved.

The invention discloses a power grid simulator simulation line impedance characteristic control method based on a cascaded H bridge, belongs to the technical field of power grid simulator control, and is suitable for a line impedance characteristic simulation system. The control method comprises the steps of firstly calculating active power and reactive power of a power grid simulator, then calculating through a VSG algorithm to obtain an output voltage instruction, and finally adding a virtual complex impedance based on generalized second-order differential on the basis of an original voltage and current double-closed-loop feedback control system to realize a simulation function of system line impedance. The generalized second-order differential function keeps the phase lead compensation differential effect on a specific frequency range, and eliminates the inherent high-frequency noise amplification effect of a traditional differential function. According to the control method, the dynamic performance of the system can be effectively improved, the output signal ripple is small, and the control speed is high.

The invention relates to a full-detail modeling large cascade H bridge application real-time simulation method and system, and the method comprises the steps: carrying out the equivalent segmentation of a large cascade H bridge system topology into a plurality of equivalent circuits, replacing the segmented cascade H bridge topology with a controlled voltage source, and measuring the current of the controlled voltage source as feedback; a power grid main circuit is wholly replaced by a controlled current source, and voltages at two ends are measured as feedback; a circuit breaker is added in a main circuit topology, bypass switches are added in a cascaded H-bridge topology, and a logic control program is designed to control on and off of each switch; the divided equivalent circuits respectively run in the FPGA of each simulator, and the logic control program runs in the CPU of the simulator; and data interaction is carried out between the simulators through optical fiber communication. Compared with the prior art, the method can achieve the precise simulation of each working condition of the large-scale cascaded H bridge system, and achieves the full-physical IO interaction controller hardware-in-loop testing of the large-scale cascaded H bridge application of full-detail modeling.

The invention relates to the technical field of electronic circuits, and provides a driving circuit for reducing overshoot voltage during switching-on and switching-off of a relay, which comprises an H-bridge driving circuit module and a control module. The H bridge is composed of four MOS tubes, the drain electrodes of the first MOS tube and the third MOS tube are connected with the positive end of a power supply, the source electrodes of the second MOS tube and the fourth MOS tube are grounded, the source electrode of the first MOS tube and the drain electrode of the second MOS tube are connected with the first coil end of the relay, and the source electrode of the third MOS tube and the drain electrode of the fourth MOS tube are connected with the second coil end of the relay. The control module inputs control signals to the grid electrodes of all the MOS tubes, and four working modes of keeping, forward pull-in, reverse pull-in and follow current discharge are achieved. The action stability of the relay can be improved, the service life of the relay can be prolonged, and circuit energy consumption and electromagnetic interference are reduced.

The invention discloses a three-phase energy storage converter dynamic parameter modulation method and a related device thereof, and the method comprises the steps: configuring a modulation strategy of a grid side 3-1MC matrix converter as a current space vector modulation strategy, configuring a modulation strategy of a DC side H bridge as a phase shift modulation strategy, introducing a modulation duty ratio coefficient # imgabs0 # as a modulation parameter, and carrying out the phase shift modulation of the DC side H bridge; the modulation parameters are reduced to modulate a duty ratio coefficient # imgabs 1 # and an input reference current phase # imgabs 2 #, and the technical problems that in an existing modulation method of the AC-DC matrix converter, the modulation parameters are too many, all the parameters are difficult to coordinate through closed-loop control, no parameter can be used for closed-loop control, and meanwhile coordination control over the primary side and the secondary side is difficult to achieve are solved. On the basis, the waveform of a switching signal of the grid-side 3-1MC matrix converter is improved, so that during voltage commutation and current commutation of the grid-side 3-1MC matrix converter, power switch tubes connected in parallel with body diodes with opposite current directions in the grid-side 3-1MC matrix converter are kept on, and the soft switching characteristic of the power switch tubes is realized.

The present invention discloses a STATCOM system and a control method for a cascaded H-bridge without electrolytic capacitors, belonging to the field of power electronic control. The system comprises: a three-phase power grid, a three-phase reactive load, a filtering inductor and a three-phase cascaded N Buck multiplexing type H-bridge, N≥2; the Buck multiplexing type H-bridge comprises: an H-bridge composed of switch tubes S1-S4, a decoupling inductor L r , two film capacitors C d and C r , C r Passing by L r The midpoint of the second bridge arm of the H bridge is connected to form a bidirectional Buck circuit, and the bidirectional Buck circuit and the second bridge arm of the H bridge realize switch tube multiplexing; the midpoint of the first bridge arm of the H bridge is connected to the midpoint of the second bridge arm of the previous H bridge, and the three phases are connected in star shape. In the present invention, the bidirectional Buck circuit performs active power decoupling on the one hand, and the fluctuating power on the DC side of the H bridge is transmitted to the L r Transfer to auxiliary capacitor C r , thereby eliminating the double frequency fluctuation of the voltage on the DC side of the H-bridge, realizing the replacement of electrolytic capacitors with film capacitors, and at the same time assisting the first arm of the H-bridge to complete the power conversion on the AC and DC sides, thereby improving the power density and reliability of the device.

The present application relates to a kind of power distribution network ground parameter and grounding transition conductance online identification method, this method utilizes the neutral point voltage during the single-phase ground fault of power distribution network and the compensation current information injected by active inverter (active inverter in abstract drawing is taken as an example with cascaded H bridge), combined with recursive least square method and limit approximation idea, obtain the online measurement formula of power distribution network ground capacitance, ground resistance, grounding transition conductance, simultaneously introduce variable forgetting factor strategy on the basis of recursive least square method, improve the anti-interference ability of algorithm.The method of the present application can realize the integration of active inverter parameter measurement and arc extinction, using the ground parameter and grounding transition conductance information of online identification, adapt to line operating condition change and improve the arc extinction effect under the ground fault of power distribution line change, quickly judge the moment when ground fault disappears, reduce the overvoltage risk of non-fault phase equipment caused by long time input of active inverter during arc extinction.

The utility model provides an H-bridge parallel re-topology, which comprises an H-bridge formed by N groups of IGBTs and N corresponding current-sharing inductors, each group of H-bridges has the same structure and is controlled by an independent current-sharing loop, the midpoint of the left bridge arm of each group of H-bridge is connected with one end of the corresponding current-sharing inductor, the other end of each current-sharing inductor is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the other end of the capacitor C1. The other end of the capacitor C1 is connected with the midpoint of the right bridge arm of each group of H bridges; and two ends of each group of H bridges are connected in parallel with bus voltage. According to the H-bridge parallel re-topology and the current sharing control loop thereof provided by the utility model, the defect of multi-path parallel connection of IGBTs is avoided, and current multiplication output of H-bridge parallel connection is realized.

A distributed ice melting device topological structure suitable for an ultra-high voltage power transmission line comprises a plurality of ice melting sub-modules arranged in a distributed mode, and each ice melting sub-module comprises a single-turn coupling transformer, a metal oxide voltage limiter, a bypass switch, a filter, an H-bridge current converter and a direct-current capacitor. A primary winding of the single-turn coupling transformer is directly formed by split sub-conductors of the ultra-high voltage power transmission line, and a secondary winding of the single-turn coupling transformer is electrically connected with other parts of the ice melting sub-modules, so that the ice melting sub-modules are connected in series on the split sub-conductors of the power transmission line in a distributed manner; the H-bridge current converter is electrically connected with the direct-current capacitor, and the direct-current capacitor provides smooth direct-current voltage for the H-bridge current converter; the filter is connected in series with the H-bridge current converter, the bypass switch is connected in parallel with the H-bridge current converter, and the metal oxide voltage limiter is connected in parallel with the line side output end of the ice melting sub-module; and the ice melting sub-modules adjust the current of the corresponding split sub-conductors by changing the equivalent impedance of the ice melting sub-modules, so that accurate ice melting of the ice-coated split sub-conductors is realized, and the overall current and the transmission power of the power transmission line are kept unchanged. The technical problem to be solved by the invention is to provide the distributed ice melting device topological structure suitable for the ultra-high voltage power transmission line, and the technical problem that the existing ice melting technology cannot realize accurate ice melting and non-power-cut operation on an ice coating section on the ultra-high voltage power transmission line is solved. And normal transmission of the line is affected due to overlarge capacity demand, line overcurrent or incapability of three-phase synchronous ice melting.

The invention discloses a motor driving circuit, a circuit board and an electric tool, and relates to the technical field of electronic circuits. The circuit comprises a control module, a level conversion module, a buffer module, a driving module and an H-bridge module, the control module is connected with the level conversion module, the level conversion module is connected with the buffer module, the buffer module is connected with the driving module, and the driving module is connected with the H-bridge module; wherein the buffer module is used for transmitting a control signal to the driving module in a delayed manner; and the driving module is used for determining a driving voltage for the H-bridge module according to the driving signal and avoiding common-state conduction of the H-bridge module. Transmission of the control signal is delayed through the buffer module, and then the control signal is converted into the driving voltage for the H bridge module through the driving module according to the control signal, so that simultaneous conduction of an upper tube and a lower tube of a bridge arm on any side of an H bridge is effectively avoided, short circuit of a power supply is prevented, power transistors serving as the upper tube and the lower tube are protected, and the stability of the motor driving circuit is improved.

The utility model provides a drive circuit with chopping and current limiting functions and a stage lamp, comprising an ILIMIT pin, an external pull-down resistor arranged on the ILIMIT pin; the output end of the H bridge is connected with a load; the first input end of the control logic circuit is connected with the ILIMIT pin, and the driving output end of the control logic circuit is connected with the H bridge; the control logic circuit comprises a calculation circuit, a current detection circuit, a comparison circuit and a chopper circuit, the ILIMIT pin serves as the input end of the calculation circuit, the input end of the comparison circuit is connected with the output end of the calculation circuit and the output end of the current detection circuit, and the input end of the chopper circuit is connected with the output end of the comparison circuit and the output end of the current detection circuit. The driving circuit provided by the utility model has a current chopping and current limiting function so as to prevent the output current of the H bridge from infinitely increasing, and surge current can be effectively limited without damaging a chip and a load during the starting or transient period of the load.

The application discloses an electromagnetic field cancer treatment circuit, wherein a central processing unit is connected with a power supply part, a sampling part and a magnetic field control unit respectively, the power supply part comprises a high-voltage power supply, a current source, an H bridge and a protection circuit, wherein the input of the high-voltage power supply, the input of the current source and the input of the H bridge are connected with the output of the central processing unit, the output of the H bridge is connected with the input of the protection circuit, and the output of the protection circuit is connected with the high-voltage power supply and the central processing unit respectively; the sampling part comprises an ADC, an amplification circuit and a sampling electrode, wherein the sampling electrode collects signals at the carrier of the H bridge output electric stimulation, and the signals are output to the central processing unit after being amplified by the amplification circuit and the ADC; the magnetic field control unit comprises a motor drive and an angle sensor, and both are connected with the central processing unit; and the rotation angle of the motor drive is adjusted according to the angle collected by the angle sensor. The application can adjust the voltage, the current, the frequency and the time accurately, and can realize the closed-loop feedback electric field cancer treatment circuit.

A kind of permanent magnet direct drive type medium-high voltage high-power wind power converter and control method, belong to power electronics technical field.The wind power converter adopts H bridge midpoint clamping type five-level converter topology, wherein wind generator side is five-level midpoint clamping type H bridge converter, grid side is three three-phase three-level midpoint clamping type grid-connected converter, its DC side is connected to wind generator side converter, grid side is connected to 66kV or higher voltage grid through isolated four-winding power frequency step-up transformer.The topology structure can improve wind generator voltage to 8.5kV, and can be used in 20MW and above power level wind power system.Compared with traditional wind power converter, it has the advantages of high rated voltage, less power device, no need for device or converter parallel, large single machine capacity, simple cable twisting, small cable loss, good harmonic characteristic, high fault tolerance, simple structure, easy to control, etc., and has important application prospect in medium-high voltage high-power offshore system.

The invention discloses a rotary excitation current control circuit, which belongs to the field of automatic control systems and mixed signal integrated circuits, and is characterized in that current flowing through an H bridge must flow through a resistor Rshunt, an amplifier circuit A amplifies voltage at two ends of the resistor Rshunt, a peak detection circuit detects the maximum voltage within a period of time, and the peak detection circuit detects the maximum voltage within a period of time. The ADC quantizes peak voltage in a period of time and quantizes temperature voltage transmitted by the temperature sensor in another period of time, the peak voltage quantized by the ADC adjusts the amplitude of sine waves through a PID algorithm, so that the duty ratio of SPWM waves is changed, connection or disconnection of M1, M2, M3 and M4 is controlled after H-bridge driving, the rotating excitation current peak value is controlled, in addition, the ADC quantizes the temperature voltage in another period of time, and the rotating excitation current peak value is controlled. The real-time temperature is sent to the digital control circuit, and the digital control circuit sends a proper control code to each module according to the current temperature, so that each part in the system is not influenced by the temperature as far as possible.

The utility model relates to the technical field of H-bridge drive circuits, and discloses a high-reliability H-bridge dead-zone generation circuit, which comprises two AND gates for preventing two MOS (Metal Oxide Semiconductor) transistors on the same side of the circuit from being switched on at the same time; the exclusive-OR gate can distinguish input signal directions and output response control signals; the Schmitt trigger is used for converting the curve waveform into a PWM (Pulse Width Modulation) square wave signal and inhibiting noise and interference in an input signal; the RC time delay circuit is connected with the Schmitt trigger and is used for realizing signal delay; the two AND gates comprise a first AND gate and a second AND gate; the first AND gate and the second AND gate are electrically connected with the exclusive-OR gate, and the exclusive-OR gate and the first AND gate are electrically connected with the Schmitt trigger; according to the utility model, the formation of dead zone time is realized through RC time delay and Schmidt characteristics, the condition of circuit damage caused by simultaneous conduction of the H-bridge drive circuit in the working process is avoided, the hardware cost is lower, and the reliability is higher than the reliability realized by software.

The application provides a H-bridge motor driver with adjustable same-bridge interlocking dead time, which has the advantages of small circuit loss, no same-bridge arm conduction of the H-bridge circuit, small product volume and adjustable dead time function.

The invention discloses a bus constant-current driving circuit of a two-phase hybrid stepping motor and a control strategy of the bus constant-current driving circuit, and belongs to the technical field of stepping motor driving and control. The circuit comprises a current sampling module, an operational amplifier circuit, a filter, an embedded processor and an H-bridge gate drive circuit. The current sampling module collects a low-voltage side bus current signal and converts the current signal into a voltage signal; amplification processing and filtering processing are sequentially carried out through an operational amplifier circuit and a filter; the embedded processor calculates the actual bus current based on the processed signal, then calculates the total duty ratio opening coefficient of the on-off of the bus, distributes the current to the A-phase winding and the B-phase winding according to the current electrical angle, and outputs a corresponding PWM (Pulse-Width Modulation) control signal; and the H-bridge gate drive circuit respectively controls power transistors in the A-phase H bridge and the B-phase H bridge according to the PWM control signal. According to the bus constant-current driving circuit of the two-phase hybrid stepping motor and the control strategy of the bus constant-current driving circuit, the circuit complexity and cost can be reduced, step loss oscillation of the motor is avoided, and constant-torque stable operation is achieved.

The utility model provides a driving circuit with a plurality of driving chips connected in parallel and a stage lamp, comprising a plurality of driving chips, the output ends of which are connected with the same load; each driving chip comprises a control logic circuit and an H bridge, the output end of the control logic circuit is connected with the H bridge, and the two output ends of each H bridge are connected with the load after being connected in parallel; and the control logic circuit is used for controlling the internal current direction of the H bridge and controlling the on-off of the H bridge. According to the utility model, a large-current load is driven by a plurality of small-sized driving chips, so that the current requirement of the load is met.

The application discloses a kind of data-driven power distribution methods and systems for H bridge module health degree balance. It belongs to the technical field of power system automation. The steps are as follows: first, based on current, voltage and switch state, a thermoelectric coupling model of IGBT and capacitor is constructed to estimate dynamic temperature; Then introduce sliding window and extreme pairing mechanism, extract the thermal cycle load sequence of key devices; Then, combined with Coffin-Manson and Arrhenius model, the life damage is calculated; Normalize and time decay processing to construct module health index. On this basis, a power optimization allocation model with health awareness is constructed, TD3 reinforcement learning algorithm is introduced to realize strategy training and online deployment, forming a closed-loop control mechanism from state perception, decision optimization to scheduling execution. This method provides an intelligent and adaptive scheduling solution for multi-module energy storage systems, improving the intelligent level of system health management.

A system, device, and method to convert power and drive electric machines, for instance electric motors advantageously employs an open winding inverter comprising of an H bridge per machine phase and an arrangement of switches in the DC supply to dynamically reconfigure the motor winding between two operating modes in order to deliver higher performance and efficiency of an electric machine over wide operating speed range, all while reducing silicon usage.

The utility model discloses a single-phase brushless motor time-delay starting operation module, which mainly comprises a brushless motor main body and a matched control assembly, and comprises two 41F type Hall sensors which are connected in parallel, a common pull-up resistor and the like. The two Hall sensors are symmetrically installed on the two sides of the geometric center line of a stator magnetic pole, the detection faces face a rotor permanent magnet, high and low levels are output through induction of rotor magnetic pole changes, the H-bridge power tube is controlled, and stator coil power supply state switching is achieved. During working, according to the characteristics of the Hall sensor, the motor is controlled to be started and run according to the principle that the motor is firstly turned off and then turned on, and the dead time control unit generates 0.5-2 ms power tube switching delay. According to the module, the starting success rate of the motor is greatly improved, the starting failure risk is effectively reduced, and the vibration amplitude in the starting process is obviously reduced. In the operation stage, the motor efficiency is remarkably improved, and the rotating speed fluctuation is extremely small when the load changes. Moreover, the circuit design of the module is simplified, so that the hardware cost is greatly reduced.

The utility model discloses a high-voltage detection and timing H-bridge driving circuit, and belongs to the technical field of motor driving. The high-voltage detection and timing H-bridge driving circuit comprises a high-voltage detection unit, a gate driving unit and an H-bridge circuit, the high-voltage detection unit is connected with the four comparators through voltage division output, and the two groups of comparators are respectively used for comparing different voltage sources to realize accurate high-voltage detection. The grid driving unit comprises a first trigger, a second trigger, a first grid driver and a second grid driver, and effective control over the grid of the H-bridge circuit is achieved through cooperative work of the triggers and the grid drivers. And the grid electrode of the H-bridge circuit is connected to the output end of the grid electrode driver and is used for being connected with an external load driver. According to the utility model, the problem that the motor driving circuit in the prior art is difficult to realize the accurate management of the steering of the motor under the condition that long-time accurate timing control is required is effectively solved.

The utility model discloses an integrated circuit, which belongs to the technical field of semiconductors, comprises a logic gate circuit Gata, a dead zone control unit, an over-current protection unit and a driving output unit, solves the technical problems of providing stable dead zone control, quickly responding to over-current protection and preventing simultaneous conduction of HO and LO in the process of driving an H bridge, does not need to be controlled by an MCU (Microprogrammed Control Unit), and is convenient to use. The system independence is improved, the hardware circuit response speed is high, RC delay and a Schmitt trigger are adopted, stable and reliable dead time is ensured, efficient dead time control is achieved, a current sampling resistor, a comparator and a D trigger are adopted for over-current detection, the response speed is high, an H-bridge driving signal is cut off immediately during over-current, damage is prevented, the logic gate design ensures that no driving signal exists when A = 1 and B = 1 or A = 0 and B = 0, and the system reliability is improved. H-bridge direct connection is avoided, overcurrent alarm is provided through an ALRM pin, and fault detection of the system is facilitated.

The invention discloses a mixed voltage compensation power flow adjusting method and device based on an IGBT-H bridge thyristor, and relates to the technical field of power electronic equipment, and the method comprises the following steps: adjusting the power through a preset discrete layer based on dynamic voltage tracking and shortest path optimization, and adjusting the power through a preset discrete layer; the shortest path is obtained by iterating an obtained local optimal path working point through a greedy algorithm; a series connection structure of a discrete layer and a preset continuous layer is constructed, in the structure, the discrete layer and the continuous layer are controlled to work cooperatively through a time sequence, and the cooperation comprises compensating for an error of power adjustment of the discrete layer through the continuous layer. The method is used for solving the problem that a hybrid phase-shifting transformer controlled by a thyristor has errors in power flow regulation.

The invention relates to the field of motor driving, in particular to a direct current motor parameter on-line measuring system which comprises a digital control unit, an H bridge, a first analog comparator, a second analog comparator, a first analog-to-digital converter and a second analog-to-digital converter. The first analog comparator and the second analog comparator compare the tail current with a preset current value given by the digital control unit, the comparison result is sent to the digital control unit, the digital control unit carries out calculation processing on the comparison result, accurate detection of the inductance, the resistance, the rotating speed, the average current I and the current ripple of the motor is achieved, the system does not need an additional sensor, and the cost is reduced. Only two comparators are needed, so that the system cost and the installation complexity are greatly reduced; inductance and resistance can be measured at the initial starting stage; and motor current (ripple and average current) and rotating speed conditions are monitored in real time.

The present invention discloses a hybrid control strategy suitable for a matrix boost LLC resonant converter, which belongs to the field of power electronics technology. The hybrid control strategy is divided into three modes: half voltage, half current and full voltage and current mode. The half voltage mode is to control the output voltage of the matrix transformer T2 to be zero. In this case, only T1 transmits power to the load to achieve half voltage output. The system can operate in this mode in the standby state to reduce the standby power consumption of the system; the half current mode is to control the windings #1 and #4 of the transformers T1 and T2 to work, and turn off the driving signal of the H bridge corresponding to the windings #2 and #3. In this case, only windings #1 and #4 transmit power to the load to achieve half current output. The system can operate in this mode from no-load to half-load state; the full voltage and current mode is to ensure that H (1,1) 、H (1,2) 、H (2,1) 、H (2,2) The driving signal is consistent. In this case, all windings of the matrix transformer transmit power to the load, achieving full voltage and full current output. It can operate in this mode from half load to full load.

This disclosure describes techniques that address the unequal loss distribution between switches in two H bridge legs of two-level PSFB and DAB converters, where one leg reaches its temperature limit sooner than the other leg due to imbalanced losses. The techniques involve dynamically controlling the switching states of power switches in both legs simultaneously in order to maintain a consistent equivalent phase shift angle between those legs at the given operating point while enabling each leg to dynamically alternate between leading and lagging positions. The dynamic switching state transitions may be seamless, so as not to introduce any transients into the rest of the circuit. By implementing this approach, the techniques achieve a balanced loss distribution between the two legs, thereby facilitating higher power density operation.

The invention provides a current source resonance type inter-line direct current power flow controller topology and a frequency conversion control method. The current source resonance type inter-line direct current power flow controller topology comprises a first current source type H bridge, a second current source type H bridge, an isolation transformer and a resonance capacitor, each H bridge serves as a port and is composed of four bidirectional switches, and each bidirectional switch comprises two power MOSFETs with common source electrodes connected in series; the turn ratio of the primary side to the secondary side of the isolation transformer is 1: 1; the two resonant capacitors and the leakage inductor of the isolation transformer form a CLC resonant circuit; wherein the direct current side of the first current source type H bridge is connected with a first direct current line, and the alternating current side is connected with the primary side of the isolation transformer through the CLC resonance circuit; the direct-current side of the second current source type H bridge is connected with a second direct-current line, and the alternating-current side is connected with the secondary side of the isolation transformer through the CLC resonance circuit; during operation, the first current source type H bridge and the second current source type H bridge invert direct current of a direct current line into alternating current in a square wave form and inject the alternating current into the CLC resonance circuit.