215 results about "H bridge inverter" patented technology

The power unit includes H bridge inverter circuit, capacitance in DC section connected to DC bus in inverter circuit, and control circuit for controlling operation of the power unit. The power unit also includes a clipping energy consumption circuit. Combining a small quantity of active power absorbed by active electric power filter, the method realizes controlling DC bus voltage of power unit. The active electric power filter includes following parts: inverter with each phase including at least one power unit; voltage detection circuit, central control system, filtering circuit, precharge circuit, income line switch, interface and communication circuit, and cooling unit etc.

The present application relates to a cascaded H-Bridge medium voltage drive, a power cell, and a bypass module thereof, wherein the bypass module is configured for bypassing a major circuit module of the power cell, while the major circuit module comprises a fuse, a rectifier, a bus capacitor and an H-Bridge inverter, two points led from the H-Bridge inverter being configured as a first output end and a second output end; a bypass circuit comprises a first bridge arm and a second bridge arm; a point led from the first bridge arm is configured as a first input end of the bypass circuit, a point led from the second bridge arm is configured as a second input end of the bypass circuit, and the first input end is electrically connected with the first output end, the second input end is electrically connected with the second output end.

A power converter includes an active front end (AFE) that is coupled by a dc link stage to a plurality of H-bridge inverters. One or more multi-phase electro-magnetic energy conversion devices, such as transformers or electric machines, with open windings that are connected to only the AFE or only the H-bridge inverters or to both the AFE and H-bridge inverters, provide a regenerative or partial regenerative power converter.

The invention discloses a cascaded photovoltaic grid-connected inverter and a control method. The cascaded photovoltaic grid-connected inverter has the advantages of high voltage level, high power level, high power quality and the like, and can realize direct high voltage grid connection without any transformer to save cost and an occupied area. The inverter comprises a photovoltaic array and a plurality of cascaded unit bodies. The photovoltaic array comprises a plurality of photovoltaic units of which each is connected with the input side of a corresponding unit body. Each unit body is a single-stage single-phase photovoltaic grid-connected inverter which comprises a DC bus capacitor and an H bridge inverter circuit, wherein the DC bus capacitor is connected in parallel to the input endof the single-stage single-phase photovoltaic grid-connected inverter; and the H bridge inverter circuit is connected in parallel with the DC bus capacitor.

The invention discloses a wireless charging apparatus with a bidirectional energy flowing function. The wireless charging apparatus comprises an input side controllable rectifying link which consists of an inductor L and power switching tubes Q1-Q4, a Z source converter which consists of inductors L1 and L2 and capacitors C1 and C2, a single-phase H-bridge inverter which consists of power switching tubes Q5-Q8, a wireless electric energy transmission mechanism which consists of a transmitting-receiving coil and a compensation network, and a vehicle-mounted controllable rectifying link which consists of power switching tubes Q9-Q12, wherein Q9-Q12 are connected with the capacitors C and the battery in parallel; and the compensation network comprises a primary side LCC compensating network which consists of a primary side compensating inductor Lp and two primary side compensating capacitors Cp and a secondary side LCC compensating network which consists of a secondary side compensating inductor Ls and two secondary side compensating capacitors Cs. The wireless charging apparatus has the functions of power factor correction and bidirectional energy flowing at the same time, and has high transmission efficiency.

The invention relates to an active power quality adjuster, consisting of a fundamental wave compensation part and a harmonic wave compensation part, and the two parts compensate fundamental current and harmonic current respectively. An H-bridge cascade multilevel inverter and a fundamental wave connection inductance are connected in series at the fundamental wave compensation part, so that reactive compensation and unbalanced load compensation can be dynamically carried out; the H-bridge cascade multilevel inverter and a unituning passive filter are connected in series to form the harmonic wave compensation part which is connected across the two ends of the fundamental wave connection inductance. Therefore, the power quality adjuster can lower switching frequency and loss of the H-bridge cascade multilevel inverter at the fundamental wave compensation part greatly on one hand, and only a fraction of fundamental current passes the harmonic wave compensation part and the whole part only undertakes fundamental voltage of the fundamental wave connection inductance without undertaking fundamental voltage on the other hand, thereby effectively reducing the capacity of the H-bridge inverter and the withstand voltage at the harmonic wave compensation part.

The invention relates to a dynamic voltage stabilizer for assisting a wind driven generator in realizing low voltage ride through (LVRT), and belongs to the technical field of power system flexible alternating current power transmission and distribution and power electronics. The dynamic voltage stabilizer consists of three same single phase alternating current and direct current (AC-DC-AC) conversion full bridge structures; a normal AC transformer is connected with a single phase H bridge structure uncontrolled rectifier to form each phase; a capacitor is connected with a single phase H bridge inverter; and an AC port of the inverter is directly connected with the capacitor and a power grid through a filter inductor. The dynamic voltage stabilizer has the functions of voltage compensation and active power absorption, can assist doubly-fed induction wind motor in realizing the LVRT function when voltage drops off, improves the power generation capacity of a wind power station when the power grid fails, has a simple structure, can obtain good voltage compensation effect and dynamic response characteristic, is suitable for industrial production, and improves the reliability of the wind power station.

The invention relates to a device for the high-speed off of an energy-feedback constant-voltage clamp. The device comprises a constant voltage source circuit, a clamp circuit and an H bridge inverter circuit, wherein the constant voltage source circuit provides stable voltage during the falling edge of emission current; the clamp circuit provides a current pathway for a transmitting antenna during the falling edge of the emission current, and energy in the transmitting antenna is released to the constant voltage source circuit, so that the voltage on the transmitting antenna reaches a voltage value of a constant voltage source to realize the voltage clamp purpose. The invention further provides a method for the high-speed off of a transient electromagnetic transmitter and the energy-feedback constant-voltage clamp. The device provided by the invention can realize high-speed and linear off during the falling edge of the current, is small in tail oscillation, effectively restrains current overshoot, feeds back the energy stored in the transmitting antenna during the falling edge to the constant-voltage source and releases during the rising edge of a next emission current pulse, so that the current rapidly rises, the energy loss is reduced, moreover, the working efficiency of the transmitter is improved.

The invention discloses a fault-tolerant control method and system for a dual-winding three-phase permanent magnetic fault-tolerant motor. The fault-tolerant control method of any three-phase permanent magnetic fault-tolerant motor includes the first step of obtaining set torque, the second step of obtaining a direct-axis current set value and a quadrature-axis current set value, the third step of transforming the direct-axis current set value and the quadrature-axis current set value to obtain current set values of all phase windings under a normal condition, the fourth step of detecting actual currents of all the phase windings of the three-phase permanent magnetic fault-tolerant motor, and the fifth step of judging whether a short-circuit or open-circuit fault happens to any phase winding, calculating the current set values of all the phase windings under a fault condition according to a set current calculation formula under the fault condition if the short-circuit or open-circuit fault happens to any phase winding, comparing the current set values of all the phase windings under the fault condition with the actual currents of all the phase windings of the three-phase permanent magnetic fault-tolerant motor, and converting comparison signals to control signals of a three-phase H-bridge inverter. Through the fault-tolerant control method and system, the torque can be effectively and reasonably distributed so that the system can continue operating in failure.

The invention provides a three-phase H-bridge driving system for an open type winding induction motor and belongs to the field of motor control. The three-phase H-bridge driving system aims to solve the problem that a double-inverter modulation algorithm adopted for an existing open type winding induction motor is complex. According to the scheme, a DC filter capacitor, an A-phase H-bridge inverter, a B-phase H-bridge inverter and a C-phase H-bridge inverter are sequentially connected to a DC bus output from a rectifier in parallel; an A-phase winding of the open type winding induction motor is connected between two AC output ends of the A-phase H-bridge inverter in parallel, a B-phase winding of the open type winding induction motor is connected between two AC output ends of the B-phase H-bridge inverter in parallel, and a C-phase winding of the open type winding induction motor is connected between two AC output ends of the C-phase H-bridge inverter in parallel; a V / F controller receives a rotational speed instruction nr and outputs three-phase symmetric sinusoidal modulated waves uar, ubr and ucr to a bipolar SPWM modulator; the bipolar SPWM modulator compares the three-phase symmetric sinusoidal modulated waves uar, ubr and ucr with triangular carrier signals to generate six-channel switching signals, and then outputs 12-channel driving signals to the A-phase H-bridge inverter, the B-phase H-bridge inverter and the C-phase H-bridge inverter through an isolation and driving unit.

The invention discloses a power generation energy storage device based on cascade H bridge and multiport DC converter. The power generation energy storage device comprises a first full-bridge converter connected with a power generation module, a second full-bridge converter connected with an energy storage module, a third full-bridge converter connected with a multi-winding transformer, and a H bridge converter connected with an electric grid through a filter inductor. By a power generation / energy storage hybrid device, irregular new energy generated power becomes relatively smooth, and an electric grid current is limited when electric grid voltage drops. A multiport full-bridge isolated DC / DC converter can realize flexible match between the power generation module and the energy storage module with different output voltage grades, meanwhile, soft switching is realized by transformer leakage inductance and switching element stray capacitance, relatively high efficiency and electric isolation are realized, and cost is lowered. The cascade H bridge inverter is used on the electric grid side, thus, multi-level output voltage is obtained, and electromagnetic compatibility and grid connection harmonic performance are improved.

A clamp five level frequency conversion driving device with internal and external double-set of rectification bridge is prepared as forming master circuit by two sets of non-controllable rectification bridges and clamp five level inverter, selecting intermediate DC clamp capacity according system voltage level, using diode clamp five level structure as inverter and semiconductor switching component as master switch as well as using controller to generate PWM control signal by applying digital signal microprocessor as kernel.

The invention discloses a control method of a normal-pressure low-temperature plasma power supply and a power supply device. A technical route of outputting in a sequence of power-frequency alternating-current input (AC)->low-voltage rectification filtration (DC)->Buck transformer pulse width modulation and pressure adjustment (DC)->H-bridge high-frequency inversion (AC)->high-frequency isolation transformer boosting (AC), wherein a Buck transformer is used for controlling the duty ratio of pulse width modulation by a negative feedback signal U of output voltage of the Buck transformer and carrying out automatic voltage stabilizing; and in the H-bridge high-frequency inversion step, an H-bridge inverter is used for controlling a current peak value of the pulse through a negative feedback signal I of input current of the H-bridge inverter. The control method disclosed by the invention can be used for flexibly adjusting the peak value of a discharge electric field, the peak value of discharge current and discharge frequency according to the process requirements, producing stable, uniform and soft low-temperature plastic under the normal pressure for treating surfaces of fabrics, rapidly restricting filament discharge from forming and avoiding the treated fabrics from penetrating and damaging accidently.

An inductive power transfer system for a device such as battery charger on an electric vehicle includes a primary circuit having a rectifier and an H bridge inverter connected in parallel with a reactor connected in series to deliver direct current voltage to a stationary primary coil of a transformer. The system further includes a secondary circuit on the vehicle including a secondary coil and another rectifier connected in series. AC voltage from a power supply is converted to DC voltage and then transformed into a pulse width modulated high frequency square wave voltage for electromagnetic transfer from the primary coil to the secondary coil. The square wave voltage is converted back to DC voltage for delivery to a vehicle charger.

The invention provides a controller of a steering engine. The controller comprises a zeroing circuit, a steering engine feedback position circuit, a target signal conditioning circuit, a target angle and actual angle processing circuit, a direction control circuit, a signal selecting circuit, a PWM (Pulse-Width Modulation) signal generating circuit, a PID (Proportion Integration Differentiation) conditioning circuit, a carrier signal generating circuit, a signal isolating circuit, an over-current protecting circuit, a current sampling circuit, a power pipe driving circuit, an H bridge inverter circuit, a current sampling circuit and a power supply circuit. According to the controller of the steering engine provided by the invention, the common elements are adopted, so that the cost is reduced; with the adoption of the mature technology, the reliability can be ensured; and a PID control technology, a PWM control technology, a target signal and actual signal processing technology, an over-current protecting circuit technology, an isolating technology and the like are achieved by adopting discrete electronic elements; and as an experiment shown, the controller of the steering engine has the characteristics of being quick in response and good in tracking and meets the performance of controlling the steering engine.

The invention discloses a hybrid modulation strategy based power balance control method for a cascade H-bridge inverter and aims to solve a problem of incapability of stable operation of a system due to input power imbalance of a photovoltaic battery panel on a DC side of the photovoltaic inverter. The method includes steps of 1, master DC side voltage control used for realizing maximal power point voltage tracking by H-bridge unit DC side voltages and obtaining a system active current command value; 2, grid side current decoupling control capable realizing independent control of active current and reactive current and generating inverter total modulation wave voltage; 3, inter-unit power balance control including determining the correct switching states of each H-bridge unit so as to realize the power balance control among the H-bridge units and the maximal power tracking of the H-bridge units through DC side voltage error ranking of the H-bridge units. The method can be suitable for different kinds of working conditions. By adopting the method, stable operation of the cascade H-bridge photovoltaic inverter in a comparatively large range and system power generation capacity can be guaranteed.

The invention provides a power unit and a frequency converter. The power unit comprises a rectifying part, an energy storage capacitor connected with a direct current bus in parallel, and an H bridge inverter formed by four IGBTs (insulated gate bipolar translators); the rectifying part consists of two rectifying diodes and the other four IGBTs, the two rectifying diodes are connected with one phase output end of a secondary edge winding of a phase-shifting transformer, and the other four IGBTs are respectively connected with the other two phase output ends of the secondary edge winding; or the rectifying part consists of four rectifying diodes and the other two IGBTs, the other two IGBTs are connected with one phase output end of a secondary edge winding of a phase-shifting transformer, and the four rectifying diodes are respectively connected with the other two phase output ends of the secondary edge winding. According to embodiments of the invention, the rectifying software control difficulty can not be increased, and the IGBTs are under the work status of inversion by controlling the switching on / off of the IGBTs in the rectifying part, so that the electric energy generated by a motor can be fed back into a power grid.

The invention discloses a power equilibrium control method for reducing DC voltage fluctuation of a cascaded H-bridge inverter, and aims to solve the problem that power generation quantity is reduced caused by relatively large DC-side voltage fluctuation. The power equilibrium control method comprises the following steps of controlling a total DC-side voltage to achieve tracking of a maximum power point voltage of the DC-side voltage of each H-bridge unit and obtain an active current instruction value of a system; controlling decoupling of a network-side current, where independent control on an active current and reactive current can be achieved, and meanwhile, a total modulation wave voltage of the inverter is generated; and performing power equilibrium control between units, an accurate on-off state of each H-bridge unit is determined and power equilibrium control of each H-bridge unit and maximum power tracking of each H-bridge unit are achieved by sequencing an error of the DC-side voltage of each H-bridge unit. By the method, various working conditions can be adapted, stable running of the cascaded H-bridge photovoltaic inverter within a relatively large range can be achieved, moreover, the DC-side voltage fluctuation can be reduced, and the power generation quantity of the system is improved.

The invention discloses a three-phase power grid disturbance generating device and a control method thereof. The device comprises a three-phase multi-winding transformer, a power module array and an output filter which are connected sequentially, wherein the power module array comprises three groups of power modules corresponding to three-phase output; each power module comprises a three-phase PWM (pulse-width modulation) rectifier, a DC (direct-current) bus link and a single-phase H-bridge inverter which are connected sequentially; input of the three-phase PWM rectifiers is connected with secondary-side three-phase windings corresponding to the three-phase multi-winding transformer; each DC bus link comprises a DC capacitor group; output ends of the single-phase H-bridge inverters are cascaded to form device basic output; each group of power modules comprise at least one low-frequency disturbance generating power module for outputting fundamental waves or outputting the fundamental waves and harmonic waves as well as at least one high-frequency disturbance generating power module for outputting the harmonic waves. The device is controlled with the method. According to the method, the switching frequency of the at least one high-frequency disturbance generating power module is controlled to be not smaller than that of the at least one low-frequency disturbance generating power module. The device is small in size, low in cost and capable of meeting mobile, vehicle-mounted and on-site detection requirements.

The invention discloses an H-bridge inverter which is applied to an alternating current motor and outputs an output voltage of a power cell by allowing a cell controller compensating the power cell with an input voltage even if the input voltage changes. Users can select an operation mode of every cell controller as a compensation mode which is applicable for the input voltage and as an output voltage control mode according to simple instruction frequency. The cell controller provides a compensation control function for changes of the input voltage, thereby reducing communication loads between a main controller and a cell controller.

The invention relates to a dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter which comprises an H-bridge chopper circuit, wherein an input end of the H-bridge chopper circuit is connected with an output end of a photovoltaic battery board, an output end of the H-bridge chopper circuit is connected with an input end of a high-frequency transformer T1, an output end of the high-frequency transformer T1 is connected with an input end of an H-bridge inverter circuit through a rectification filter circuit, and an output end of the H-bridge inverter circuit is connected with an input end of an output filter circuit. The inverter further comprises a digital signal processor (DSP) controller, an input end of the DSP controller is connected with output ends of a photovoltaic detection sampling circuit, a grid-connection sampling circuit and a protective circuit, and an output end of the DSP controller and a driving circuit are respectively connected with input ends of the H-bridge chopper circuit and the H-bridge inverter circuit. The dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter achieves complete isolation of photovoltaic battery direct current and power grid alternating current through the high-frequency transformer T1 and achieves high efficiency of system operation by adopting of controlling of two-stage high-frequency pulse-width modulation (PWM). The dual H-bridge high-frequency isolation type photovoltaic grid-connected inverter can conduct comprehensive monitoring and protection for a system by adopting of a protective circuit, and effectively ensures safety and reliability of grid-connected operation of a photovoltaic inverter.

The present disclosure proposes an input power of each unit power cell of a cascaded H-bridge inverter that is mutually insulated. To this end, the present disclosure includes a phase shift transformer configured to output a voltage of predetermined phase by receiving an AC input power having a fixed frequency, and a plurality of unit power cells serially-connected configured to output a voltage having a predetermined phase by receiving a voltage provided by the phase shift transformer, wherein the phase shift transformer is configured to include the number of phase shifts corresponding to the number of the plurality of unit power cells.

The invention discloses a high-gain insulation-type three-level-type multi-path output DC-AC converter without a lost duty ratio. The front stage of the converter is a BOOST converter, the middle stage is an LLC resonant converter, the original edges of the LLC resonant converter are in parallel connection, the two paths of auxiliary edges of the LLC resonant converter conduct independent output,and the back stage of the converter is an H-bridge converter; the converter comprises two high-frequency insulation transformers, the original edges of the two high-frequency insulation transformers are in parallel connection and are connected to an LLC resonant network, the other end of the LLC resonant network is connected with a bridge-type circuit and a BOOST circuit in sequence, and the auxiliary edges of the two high-frequency insulation transformers are connected with a rectifying circuit and an H-bridge inverter in sequence respectively and conduct independent output. According to theconverter, the high-gain no-load voltage ratio is achieved through a three-level-type structure, electrical insulation of the original edges and auxiliary edges is achieved through a middle-stage LLCcircuit, and the safety is high; the duty ratio of the LLC circuit is not lost, the LLC circuit is easy to control, through independent output of the two paths of the auxiliary edges, the number of converters is reduced, and the cost is lowered.

The invention provides a method and device for detecting an initial position angle of an electro-excitation synchronous machine rotor, belonging to a control method and device of a motor. A three-phase power supply in the device is connected with an electro-excitation synchronous machine by a three-phase voltage source inverter; a voltage transducer is connected with a power line between the three-phase voltage source inverter and the electro-excitation synchronous machine; the voltage transducer is connected with an input end of a DSP (digital signal processor) control system; an output end of the DSP control system is connected with a PC (personal computer); a DC (direct current) power supply is connected with a rotor exciting winding of the electro-excitation synchronous machine by an H-bridge inverter; a current transducer is connected with a power line between the H-bridge inverter and the rotor exciting winding of the electro-excitation synchronous machine; and IGBT (insulated gate bipolar translator) drive signals are connected with the H-bridge inverter. According to the invention, the structure is simple and reliable, the realization is easy, the anti-interference performance is strong, the detection accuracy is high, the additional hardware overhead is not required, and the detection result of the initial position angle of the rotor can be acquired.

A blood pump system for left ventricle assist has an implantable pump unit having a multiphase stator having a plurality of windings connected between respective junctions for forming first, second, and third phases. An external control unit comprises an H-bridge inverter having first, second, and third phase legs. A percutaneous cable is provided having first, second, and third parallel pairs of redundant conductors. Each conductor pair is connected between a respective phase leg and a respective junction. The conductors are arranged concentrically around a cable core so that individual conductors of each pair are separated by at least one conductor of a different conductor pair.

A blood pump system for left ventricle assist has an implantable pump unit having a multiphase stator having a plurality of windings connected between respective junctions for forming first, second, and third phases. An external control unit comprises an H-bridge inverter having first, second, and third phase legs. A percutaneous cable is provided having first, second, and third parallel pairs of redundant conductors. Each conductor pair is connected between a respective phase leg and a respective junction. The conductors are arranged concentrically around a cable core so that individual conductors of each pair are separated by at least one conductor of a different conductor pair.

The invention discloses a predictive current control method for a cascaded H-bridge inverter permanent magnet motor system. The method comprises the steps: connecting a surface-mounted permanent magnet synchronous motor to the three-phase output side of a cascaded H-bridge multilevel inverter, and establishing a discretization mathematic model in a complex vector form under a d-q coordinate system; acquiring a predicted current vector of a voltage vector actually acting in a kth control period under the action of a (k+1)th control period based on the model; constructing a value function according to the relationship between the current vector and the voltage vector increment; and determining the hysteresis width and the increment of an optimal voltage vector according to the amplitude andphase angle of a current error vector, and determining an optimal voltage vector of the (k+1)th control period according to an optimal voltage vector under the action of the kth control period. The prediction frequency and the value function optimization frequency can be reduced, the complexity of a multi-level model predictive control algorithm can be greatly reduced, and the method has better dynamic and stable performances.

The invention discloses a wind electricity-based electric energy quality series compensator. The wind electricity-based electric energy quality series compensator comprises a wind turbine, a synchronous generator, a rectification unit, a three-phase H-bridge inverter unit and a series transformer and is connected in series with a power grid; when the power grid runs normally, the electric energy quality compensator converts wind energy into electric energy and outputs power to load; when the voltage of the power grid drops or rises suddenly (surges) due to the failure of the power grid, the electric energy quality compensator outputs the corresponding compensating voltage, so that the voltage of the load end is kept unchanged; and therefore, the load can be protected from being influenced by the failure of the power grid. By using the wind energy, the problems in the energy storage of the conventional series compensator are solved; and the wind electricity-based electric energy quality series compensator has the characteristics that by wind energy generation and energy storage, the problem that the voltage drops and rises suddenly can be solved, and the electric energy quality is improved.

The invention provides a cascaded H bridge inverter and a fault handling method thereof. The fault handing method comprises the steps that a controller detects the output voltages or output powers of N solar cell panels; when the output voltage of the certain solar cell panel is less than a preset voltage or the output power of the same is less than a preset power, the controller controls a corresponding switching device to disconnect, and changes the corresponding direct current side capacitor voltage set value; and then the controller controls the corresponding H bridge module to invert by using the direct current side capacitor voltage set value as the input value, thus the total output modulated voltage of the cascaded H bridge inverter meets a preset condition, the system cannot operate normally and stably is avoided, it ensures that the undamaged solar cell panel can deliver energy to the power grid, and the heavy loss of the generated energy is avoided.