93 results about "H bridge" patented technology

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 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 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 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.

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.

The invention discloses a cascaded H-bridge structure network type converter based on MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors) and a control method thereof. The cascaded H-bridge structure network type converter based on the MOSFET comprises an MOSFET full-bridge sub-module which adopts a full-bridge topological structure and is used for outputting three levels of '+ 1', '0' and '-1'; the overall structure of the cascaded H bridge is composed of three bridge arms, and each bridge arm is formed by cascading N MOSFET full-bridge sub-modules. The high-frequency cooperative modulation strategy is used for controlling the overall architecture of the cascaded H bridge; and a network construction type converter control strategy: based on a virtual synchronous machine principle, generating a voltage reference value and a phase angle reference value required by the MOSFET full-bridge sub-module by simulating a rotor motion equation and a transient voltage equation of a synchronous generator, and finally generating a trigger pulse through a PWM (Pulse-Width Modulation) generator to control the action of the MOSFET full-bridge sub-module.

The invention discloses a three-phase H-bridge water-cooling inverter unit, which comprises a plurality of inverter modules arranged side by side, an input laminated busbar positioned on the rear sides of the inverter modules, and a support capacitor, an output busbar, a voltage sensor and a discharge resistor which are arranged below the inverter modules, each inversion module comprises a water cooling plate with a water inlet and outlet connector and a high-temperature-resistant epoxy resin protective cover arranged outside the water cooling plate, a driving plate, an IGBT (Insulated Gate Bipolar Translator), a current sensor and a fuse are sequentially arranged on the water cooling plate in the protective cover, and a front end plate of the protective cover is provided with an optical aviation plug port and an electric aviation plug port; the invention further discloses a frequency converter based on the three-phase H-bridge water-cooling inversion unit. The inversion unit has the characteristics of compact structural design, small volume, light weight, high space utilization rate, high reliability, high maintenance efficiency, strong redundancy expansibility and the like, is convenient to disassemble and assemble, and can greatly improve the maintenance efficiency.

The invention discloses a decoupling type multi-phase motor based on a two-phase multiple phase number, and solves the technical problems of complex winding coupling and control, limited fault tolerance and high hardware cost of a traditional multi-phase motor based on a multiple phase number of 3. The motor adopts a multiple of 2 as a phase number, a stator winding is spatially orthogonally / symmetrically distributed and is designed without a neutral point, and natural decoupling of a magnetic field is realized; each phase is provided with an independent H-bridge control unit, adjacent phases adopt bridge arm sharing topological optimization, and the main controller can adjust the current of each phase through simple PI control; a fault phase can be directly isolated when a fault occurs, and a healthy phase can continue to work without complex reconstruction; the method has the advantages of high control precision, high fault tolerance and low hardware cost, is adaptive to asynchronous, permanent magnet synchronous, reluctance and other motor types, and can be applied to the fields of new energy automobiles, industrial driving, aerospace and the like.

The application relates to the technical field of transformer simulation, and discloses a simulation modeling method and system of a direct-current transformer. The method discretizes the direct-current transformer into H bridges and transformers, constructs equivalent circuit models of the H bridges and the transformers of the direct-current transformer respectively, connects the equivalent circuit models of the two H bridges through the equivalent circuit model of the transformer, and obtains a circuit simulation model of the direct-current transformer, so that the integrity and output characteristics of the circuit simulation model of the direct-current transformer are ensured, and the stability of the connection between the discrete models is improved.

The application provides a fuel cell engine control system for ships, which comprises an input signal module, an output signal module, a power module and a communication module, wherein the input signal module comprises analog input, digital input and frequency input; the output signal module comprises high-low edge driving output, low edge PWM signal output and H bridge power output; the communication module comprises CAN communication and SENT communication; the control method comprises a start-up and shutdown module, a system control module and a fault diagnosis module; the system control module mainly realizes the control of key components in each subsystem of the fuel cell through calibration lookup table and PID control; the fault diagnosis module is divided into communication fault, equipment fault and operation fault according to fault categories, each fault has a corresponding fault code, the fault of each component can be reflected in the fault code, and the corresponding fault diagnosis control strategy is executed to ensure the reliability and safety of the fuel cell system.

The invention relates to an electrolytic bath power supply control method, computer equipment and a storage medium. A hydrogen production system applied by the method comprises a three-phase cascaded H bridge connected by adopting a triangular connection method, and each bridge arm of the three-phase cascaded H bridge is formed by connecting a plurality of submodules in series; the first sub-module is connected with the electrolytic cell units through the DC-DC converter, the second sub-module is connected with the functional unit through the DC-DC converter, and the method comprises the following steps: determining a power reference value of the electrolytic cell units and a power reference value of the functional unit according to constant power consumption of each electrolytic cell unit and state information of the functional unit in the second sub-module; determining a minimum reference bridge arm current based on the power reference value of the electrolytic cell unit and the power reference value of the functional unit; and based on the minimum reference bridge arm current, the power grid power and the power grid voltage peak value, determining a reference value of the actively injected third harmonic circulating current, and further determining the bridge arm current of the three-phase cascaded H bridge. The method can stably supply power to the electrolytic cell.

The invention relates to an electrolytic cell power supply control method. The method is applied to a hydrogen production system, the hydrogen production system comprises a three-phase cascaded H bridge which is connected by adopting a triangular connection method, and each bridge arm is formed by connecting a plurality of submodules in series; in the plurality of sub-modules, a first sub-module is connected with an electrolytic cell unit through a DC-DC converter, a second sub-module is connected with a functional unit through a DC-DC converter, and the functional unit comprises a photovoltaic unit and / or an energy storage unit. Determining a power reference value of the electrolytic cell unit and a power reference value of the functional unit; based on the power reference value of the electrolytic cell unit and the power reference value of the functional unit, determining the reference value of the actively injected third harmonic circulation; and determining the bridge arm current of the three-phase cascaded H bridge based on the reference value of the third harmonic circulation. The method can improve the power supply stability of the electrolytic cell.

The application discloses an electromagnetic chuck driving and protection circuit and method based on an H-bridge, and belongs to the technical field of electromagnetic chucks. The circuit comprises an H-bridge driving unit, a first energy storage unit, a second energy storage unit, a discharge unit, a voltage detection unit, a current detection unit and a control unit. The H-bridge structure is combined with IGBT switching tubes to realize positive and negative excitation and demagnetization control of the electromagnetic chuck, the first capacitor is used for storing and releasing the reverse demagnetization energy, and a double protection mechanism is used to effectively inhibit the kilovolt-level reverse electromotive force generated when power is cut off. The application has the advantages of fast response speed, long service life, high safety, low energy consumption and the like, solves the problems of workpiece release delay and reverse electromotive force hazards caused by the magnetic hysteresis effect of traditional electromagnetic chucks, and is suitable for electromagnetic control applications in the fields of mechanical machining and automatic handling.

The invention discloses a bionic mechanical head real-time control system based on a distributed CAN bus. The bionic mechanical head real-time control system comprises a distributed hardware structure, an SYNC system and a software algorithm. The distributed hardware structure is of a three-level CAN bus cascade structure and comprises a main control module, a sensor module and a motor driving module, and all the modules are connected through differential signal lines. A software algorithm covers RTOS task scheduling and a multi-mode control strategy, a motor driving module adopts a distributed design, each joint is provided with an independent driving unit, and an instruction of the main control module is received through a CAN bus. The controller is an incremental PID (Proportion Integration Differentiation) controller and also adopts an S curve acceleration and deceleration algorithm. The sensor module integrates various sensors and is attached to the curved surface of the mechanical head through a flexible circuit board. The motor driving module adopts an H-bridge circuit and is integrated with the CAN transceiver. The system can simplify wiring, improve expansibility and real-time performance, reduce mechanical shock and noise, enhance anti-interference capability, prolong the service life of a mechanical structure, and improve operation reliability and adaptability.

The utility model relates to battery leakage monitoring and protection technical field, concretely relates to a current leakage monitoring and automatic circuit protection circuit system, include: a plurality of independent protection unit and a centralized management module. Each protection unit corresponds to a battery section, possesses local leakage detection and circuit breaking function. Each protection unit includes ripple injection module, phase detection module, circuit breaker executor and mechanical interlock mechanism, through the ripple injection module in the battery pack ground loop injects high frequency ripple, and phase detection module extracts the phase shift and converts into voltage signal and outputs the breaking instruction. Circuit breaker execution controls double coil magnetic latching relay action through H bridge chip, realizes the physical isolation of fault section. Mechanical interlock mechanism prevents the adjacent relay misoperation through the linkage rod, improves the system security. The centralized management module summarizes each independent protection unit fault section positioning. The system realizes the accurate positioning and quick power-off isolation of lead-acid battery pack leakage fault.

The invention discloses a driving circuit of a lifting table motor. The driving circuit comprises an H-bridge motor driving unit, a left half-bridge driving unit, a right half-bridge driving unit, an enabling circuit and a PWM signal output unit. The left upper arm input end of the H-bridge motor driving unit is provided with a first bootstrap boost circuit, and the right upper arm input end of the H-bridge motor driving unit is provided with a second bootstrap boost circuit; one input end of the left bridge upper arm driving module is connected with the PWM signal output unit through a first signal reverse module, and one input end of the right bridge upper arm driving module is connected with the PWM signal output unit through a NOT gate circuit and a second signal reverse module. The output end of the second bootstrap boost circuit is connected with the right upper arm of the H-bridge motor driving unit through the second bootstrap boost circuit; the input end of the right bridge lower arm driving module is connected with the output end of the NOT gate circuit and the power supply VCC, and the output end of the right bridge lower arm driving module is connected with the right lower arm of the H bridge motor driving unit. The device has the characteristics of simple structure, small size, reliable performance, high applicability and the like.

The invention discloses a cascaded H-bridge multilevel converter fault diagnosis method based on post-fault voltage modeling. The method specifically comprises the following steps: establishing a hybrid logic dynamic model of a single-phase cascaded H-bridge rectifier and generating a voltage residual error; establishing an electronic switch over-current split-phase model and analyzing the influence of the electronic switch over-current split-phase model on the rectifier; analyzing a current path after an IGBT open-circuit fault, and proposing a voltage residual model after the fault; and in combination with the hybrid logic dynamic model and a set threshold value, detecting and positioning of open-circuit faults of single tubes and multiple tubes in the modules and among the modules are realized. The IGBT open-circuit fault real-time diagnosis method realizes real-time diagnosis of the IGBT open-circuit fault under the complex working condition of over-current split-phase, and has the advantages of accurate model, high applicability, capability of processing multi-tube faults and the like.