24 results about "Igbt inverter" patented technology

The invention belongs to the technical field of storage battery monitoring systems, and particularly relates to a storage battery on-line monitoring and remote capacity checking system, which comprises a sensing architecture layer for independently configuring a distributed integrated terminal module in each storage battery unit through a multi-physics field monitoring unit and monitoring the temperature, internal resistance and deformation of a storage battery pole; the analysis architecture layer is used for constructing a health evaluation module based on a fusion ampere-hour integral method, an internal resistance correction model and deep learning prediction to predict the health of the storage battery, and establishing an abnormal judgment strategy based on temperature gradient change and rapid capacity change quantity to carry out early warning on the safety of the storage battery; and the execution architecture layer integrates the three-level IGBT inversion module and the dynamic compensation module to carry out capacity checking on the storage battery, and configures an on-line on-load capacity checking mode and an off-line deep discharge mode. According to the invention, dangers and equipment power-off risks caused by a traditional capacity checking means can be eliminated, an automatic operation process is realized, the detection precision is high, and'monitoring-diagnosis-capacity checking 'closed-loop management is realized.

The invention discloses a phase-adjustable large-current generator, and the generator comprises a main circuit module, and a topological structure of the main circuit module employs a multi-stage IGBT inverter; the phase control module inputs a power grid voltage signal through a voltage transformer, adopts an SOGI-PLL structure to improve signal tracking precision, and combines a virtual synchronous machine technology to enhance system balance and a self-adaptive control strategy to dynamically adjust an output signal so as to realize phase control and synchronization; the electromagnetic compatibility optimization module adopts a layered shielding design and is combined with an optical fiber to transmit a control signal, so that the electromagnetic compatibility of equipment is improved; a relay protection test integration module, wherein the relay protection test integration module comprises a differential protection test mode and a distance protection test mode; according to the invention, the problems of low phase adjustment precision, poor synchronization stability and insufficient electromagnetic compatibility of a large current generator in a new energy grid-connected environment are solved.

The invention discloses a frequency converter multi-stage cooperative rapid overcurrent protection circuit, and the overcurrent protection circuit cooperates with an IGBT inverter circuit, an IGBT drive circuit, a current sampling circuit and a master control MCU of a frequency converter to construct a three-stage cooperative protection system composed of hardware-stage extreme rapid protection, hardware-stage rapid protection and software-stage intelligent protection. And independent action and information interaction between the stages can be realized through circuit design. Compared with the prior art, protection blind areas are eliminated, nanosecond-microsecond level extreme protection is achieved, a multiple and high-reliability redundancy protection system is constructed, intelligent grading processing of faults is achieved, and the diagnosability of the system is enhanced.

The invention discloses a Si / SiC topological parallel inverter harmonic suppression method based on multi-harmonic observation and feed-forward compensation, and relates to the technical field of power electronics, and the method comprises the steps: monitoring each harmonic signal outputted by a Si IGBT inverter in a Si / SiC topological parallel inverter in real time, and determining the amplitude and phase of each harmonic signal; the Si / SiC topological parallel inverter is of a structure in which a Si IGBT (Insulated Gate Bipolar Translator) inverter and a SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) inverter are connected in parallel Generating an adjusted current compensation signal based on a gain scheduling mechanism according to the amplitude and the phase; the adjusted current compensation signal is a current compensation signal which is equal in amplitude and opposite to a harmonic signal of the SiC MOSFET inverter; according to the invention, the harmonic suppression capability and the electric energy quality can be improved, and the method is suitable for a high-power electric power system and an application occasion with strict requirements on the electric energy quality.

The present invention discloses an AC / DC power supply control system. The system comprises a three-phase full-bridge rectifier for receiving input voltage from a three-phase power grid and converting it into a pulsating DC voltage, which is then sent to an LC filter module. The LC filter module is used to filter the pulsating DC voltage to obtain a smooth DC voltage. An IGBT inverter module is used to receive the smoothed DC voltage and invert it according to a PWM control signal output by a main control board, generating AC and DC pulse voltages required by an isolation transformer and sending the voltages to the isolation transformer. The isolation transformer generates a secondary voltage, which is then sent to an output filter module. The output filter module is used to filter the secondary voltage. Furthermore, by adding an IMDC comprehensive judgment channel to the existing single-circuit, fully digital closed-loop system, a faster voltage regulation response is achieved in the event of sudden load changes or input fluctuations, while simultaneously taking into account switching losses and protection margins within the full power range.

The invention discloses a boost inverter system, which relates to the field of photovoltaic power generation and comprises an IGBT (Insulated Gate Bipolar Translator) rectifying circuit, a first capacitor, a second capacitor, a Boost circuit, a third capacitor, an IGBT inverter circuit, a power supply circuit, a Boost driving circuit and an IGBT inverter driving circuit, the voltage input end of the power supply circuit is connected with the output end of the booster circuit; an inversion upper bridge driving voltage output end of the power supply circuit is connected with an upper bridge power supply input end of the inversion driving circuit; an inversion lower bridge-BOOST driving voltage output end of the power supply circuit is connected with a lower bridge power supply input end of the inversion driving circuit and a power supply input end of the Boost driving circuit; a driving signal output end of the inverter driving circuit is connected with a driving signal input end of the inverter circuit; and the driving signal output end of the Boost driving circuit is connected with the driving signal input end of the Boost circuit. The working stability of the inverter circuit is improved.

The application discloses a large-current generator with adjustable phase, comprising: a main circuit module, the topology structure of the main circuit module adopts a multistage IGBT inverter; a phase control module, the phase control module inputs a power grid voltage signal through a voltage transformer, adopts a SOGI-PLL structure to improve signal tracking accuracy, combines virtual synchronous machine technology to enhance system balance, and dynamically adjusts an output signal by using an adaptive control strategy to realize phase control and synchronization; an electromagnetic compatibility optimization module, the electromagnetic compatibility optimization module adopts a layered shielding design, combines optical fiber transmission control signals, and improves equipment electromagnetic compatibility; a relay protection test integrated module, the relay protection test integrated module comprises a differential protection test mode and a distance protection test mode; the application solves the problems of low phase regulation accuracy, poor synchronization stability and insufficient electromagnetic compatibility of the large-current generator under the new energy grid-connected environment.

The invention relates to the technical field of power grid data monitoring, in particular to a networking SVG (static var generator) dynamic optimization compensation device based on an intelligent power grid, which comprises a mutual inductor cluster, a sensor cluster, a dynamic optimization compensation system, an IGBT (insulated gate bipolar transistor) inverter bridge, a driving circuit, a direct current side capacitor, a connecting reactor, a circuit breaker and a connecting line. According to the device, the dynamic optimization compensation system carries out current compensation on the power grid according to the compensation current instruction, and the compensation process is updated and optimized, so that the current compensation process of the power grid is adjusted in real time, and the accuracy of dynamic compensation is improved.

The utility model provides an alternating current and direct current universal type electromagnetic range power generator, and relates to the technical field of electromagnetic induction heating, a power grid power supply is electrically connected with an IGBT inverter circuit through an alternating current and direct current conversion circuit, the IGBT inverter circuit is electrically connected with an LC high-frequency oscillation circuit, and the LC high-frequency oscillation circuit comprises an inductor L used for heating cookware; the power supply voltage sampling circuit collects power supply voltage of a power grid, the direct current sampling circuit collects output current of the alternating current-direct current conversion circuit, the IGBT driving circuit drives the IGBT inverter circuit, and the high-frequency current sampling circuit collects current flowing through the inductor L. The MCU digital processing unit outputs different frequency signals to the IGBT driving circuit according to voltage and current collected by the power supply voltage sampling circuit, the direct current sampling circuit and the high-frequency current sampling circuit, so that the working frequency of the LC high-frequency oscillation circuit is controlled, the output power is controlled, and different input power supplies can work normally.

The application discloses a Si / SiC topology parallel inverter harmonic suppression method based on multi-harmonic observation and feedforward compensation, and relates to the technical field of power electronics. The method comprises the following steps: monitoring each harmonic signal output by a Si IGBT inverter of a Si / SiC topology parallel inverter in real time, and determining the amplitude and phase of each harmonic signal; the Si / SiC topology parallel inverter is a parallel structure of a Si IGBT inverter and a SiC MOSFET inverter; according to the amplitude and the phase, an adjusted current compensation signal is generated based on a gain scheduling mechanism; the adjusted current compensation signal is a current compensation signal that is equal in amplitude and opposite in direction to a harmonic signal of the SiC MOSFET inverter; and the harmonic signal output by the SiC MOSFET inverter is suppressed according to the adjusted current compensation signal. The application can improve the harmonic suppression capability and power quality, and is suitable for high-power power systems and application occasions with strict requirements on power quality.

The utility model relates to the field of power electronics, especially low voltage crossing device, it includes voltage monitoring unit, compensation voltage generating system and overhauling isolation device. In the utility model, the device is in series between power supply and protected load, carries out real -time power grid voltage monitoring through bridge circuit, and carries out difference calculation, and the required compensation voltage is accurately generated on this basis, once finds that power supply voltage deviates from rated voltage level, generates a suitable compensation voltage injection system through energy storage device and IGBT inverter system, and the purpose of this compensation voltage is to offset the drop of power grid voltage, thereby realizes the effective management of voltage sag, guarantees load side voltage stability, ensures that sensitive load still can be unaffectedly operated when power grid voltage is abnormal.

The invention relates to the technical field of electromagnetic transmitters, in particular to a high-power pseudo-random transmitter which comprises a transmitter body. The air outlet single fan, the radiator wave fin, the radiating outer cover, the air outlet fixing cover, the radiator copper pipe, the temperature sensor, the IGBT inversion module, the radiator main body, the radiator copper substrate, the air inlet fixing cover, the air inlet electric fan, the air inlet sponge, the air inlet dustproof net and the air inlet drawer are arranged on the inner side of the transmitter main body. When the cooling liquid in the radiator copper pipe reaches a certain temperature, the cooling liquid is vaporized, steam flows and the copper pipe radiates heat, so that the heat is conducted to each radiator wave fin, the air inlet electric fan sucks air from the outside of the high-power pseudo-random transmitter to reduce the heat of the radiator wave fins, and the air outlet single fan sucks away the temperature of the radiator. And a forced air cooling system is formed, so that the functions of real-time temperature monitoring and high-temperature early warning of the IGBT inversion module are realized.

A fire detection method and apparatus for a rail vehicle traction converter cabinet, and a device and a medium, which can further improve the accuracy and reliability of fire detection for the rail vehicle traction converter cabinet. The method comprises: on the basis of the current operating state of a traction converter cabinet in a rail vehicle, setting a temperature threshold value at which an IGBT inverter module can operate safely, and using a DCU to monitor the temperature value of the IGBT inverter module at the current moment, so as to obtain a target temperature value (S11); if the target temperature value is greater than the temperature threshold value, receiving a first early warning signal triggered by the DCU (S12); if a stranded wire, which is connected to a low-level signal, in a thermo-sensing cable in the traction converter cabinet outputs a high-level signal, triggering a second early warning signal (S13), wherein two stranded wires in the thermo-sensing cable are respectively connected to the high-level signal and the low-level signal; and if the time interval between the first early warning signal and the second early warning signal does not exceed a preset time interval, determining that a fire has occurred in the traction converter cabinet (S14).

The present invention provides a detection method for preventing an electromagnetic cooker from burning dry due to an empty pot. The method comprises an IGBT inverter module, a high-frequency LC oscillator circuit, a sampling circuit, and an MCU digital processing circuit. The cookware is placed on a wire reel L in the high-frequency LC oscillator circuit. The MCU digital processing circuit is connected to a drive circuit, which is in turn connected to the IGBT inverter module, which is in turn connected to the high-frequency LC oscillator circuit. The sampling circuit includes high-frequency current and frequency sampling circuits and an input AC power supply voltage and current sampling circuit. The MCU digital processing circuit controls the drive circuit based on data from the two sampling circuits, causing the IGBT inverter module to output a constant power. The MCU digital processing circuit collects current and frequency data from the LC oscillator circuit at set intervals and stores the data in memory. When the collected LC oscillator circuit frequency change value exceeds a set value, the electromagnetic cooker is determined to be in an empty pot and burning dry condition. Advantageously, the entire process has a fast response time: it only takes a few seconds to detect that the cookware is in an empty pot and implement pot protection, thereby extending the cookware's service life and preventing fires and injuries caused by high temperatures due to an unprotected empty pot. The manufacturing cost of the induction cooker can also be reduced by removing the stovetop protection temperature sensor.

The utility model discloses a low-loss inverter circuit based on a high-frequency IGBT (Insulated Gate Bipolar Translator), which is provided with a control unit, an inverter circuit and a driving circuit, and the control unit controls the driving circuit to send a high-frequency signal to a high-frequency inverter module to carry out PWM (Pulse Width Modulation) rectification and output a direct-current voltage to a first filtering module; direct-current voltage is filtered through the first filtering module and the second filtering module, low-frequency sine waves corresponding to the direct-current voltage are output through the output module, switching loss can be reduced by adopting a high-frequency IGBT as the inverter circuit, sine pulse width modulation is adopted in the driving circuit, and the driving circuit and the high-frequency inverter circuit are combined to effectively modulate high-frequency signals. The high-frequency IGBT inverter circuit adopts RC filtering to filter and rectify the high-frequency IGBT inverter circuit, the output waveform is optimized, the circuit has the advantages of being high in integration level, low in temperature rise and few in harmonic wave, and the working stability of the circuit is improved.

This application relates to the field of motor control technology and provides a method, device, and medium for positionless control of an air conditioning compressor. The method includes: acquiring the three-phase current of a permanent magnet synchronous motor in the air conditioning compressor and transforming it to an α-β coordinate system to obtain α-axis current components and β-axis current components; inputting the α-axis current components, β-axis current components, and the first α-axis control voltage and the first β-axis control voltage of the previous cycle to a back EMF observer based on an extended state observer to determine the rotor angle of the permanent magnet synchronous motor; determining the second α-axis control voltage and the second β-axis control voltage based on the α-axis current components, β-axis current components, and rotor angle; determining the three-phase duty cycle based on the second α-axis control voltage and the second β-axis control voltage; and driving the permanent magnet synchronous motor to run by controlling an IGBT inverter, thereby improving the robustness and position estimation accuracy of the positionless control of the air conditioning compressor.

The invention relates to the technical field of intelligent energy-saving control of industrial kilns, in particular to a magnetic suspension combustion-supporting and cooling fan energy-saving control system, method and equipment for a double-hearth lime kiln. The method comprises the following steps: initially setting a magnetic suspension combustion-supporting and cooling fan working mode of the double-hearth lime kiln; based on the synchronous power generation mode, magnetic suspension combustion supporting and a cooling fan of the double-hearth lime kiln are subjected to pressure relief; based on an energy grading feedback strategy, a dual-channel IGBT inverter and a super capacitor bank are respectively used for electric energy feedback and off-grid power supply; adjusting the rotating speed of the fan based on a dynamic frequency conversion control strategy to realize cubic matching of power and the rotating speed; the magnetic suspension combustion-supporting and cooling fan switching quick response of the double-hearth lime kiln is carried out based on the rotary inertia of the lightweight rotor; safety protection is carried out in the switching process of the double-hearth lime kiln based on a safety protection mechanism; and power generation control is carried out based on rotor speed reduction fast response. According to the technical scheme, energy conservation and consumption reduction can be effectively achieved, and energy waste is reduced; meanwhile, quick response is achieved, and dynamic change is met.

The invention discloses a ship ladder traction and guide shoe integrated energy-saving and emergency safety management system and method, and relates to the technical field of ship engineering and elevators, the ship ladder traction and guide shoe integrated energy-saving and emergency safety management system comprises a self-adaptive side rope module, an inner layer of the self-adaptive side rope module is made of high-strength aramid fibers, and an outer layer of the self-adaptive side rope module is wrapped with a silica gel airtight layer; an air pressure micro-capsule array is embedded in the airtight layer, the pressure intensity of the contact surface of the side rope and the ship body is monitored in real time through a pressure sensor, and the air pressure is controlled to be adjusted within a set range; according to the active anti-derailment guide shoe assembly, a three-axis MEMS inertial sensor and laser ranging are integrated on a guide shoe body, and the offset of a ship ladder and a guide rail is detected in real time; electromagnetic locking devices are arranged at the bottoms of the guide shoes; according to the energy feedback type traction module, a permanent magnet synchronous motor is connected with a direct-current bus through an IGBT inverter, and the bus is provided with a super capacitor bank for storing regenerative electric energy; a motor control algorithm is embedded into a load identification unit, and output torque is dynamically adjusted according to data of a ship ladder tilt angle sensor. According to the invention, through fusion sensing of the air pressure micro-capsule array and the multi-source sensor, dynamic adjustment of the contact surface of the ship body is realized.

The invention discloses an anti-straight-through driving control circuit and method, and the method comprises the steps: dividing a pulse width modulation control signal transmitted by a digital signal processor into an upper bridge arm pulse width modulation control signal and a lower bridge arm pulse width modulation control signal, and carrying out the first-stage power amplification processing; obtaining an upper bridge arm pulse width modulation control signal and a lower bridge arm pulse width modulation control signal after first-stage power amplification; if no straight-through fault exists between the upper bridge arm pulse width modulation control signal and the lower bridge arm pulse width modulation control signal after the first-stage power amplification, the first-stage power amplification is carried out on the upper bridge arm pulse width modulation control signal and the lower bridge arm pulse width modulation control signal; and performing second-stage power amplification on the upper bridge arm pulse width modulation control signal and the lower bridge arm pulse width modulation control signal after the first-stage power amplification so as to drive the connection and disconnection of the upper bridge arm and the lower bridge arm of the IGBT inverter bridge, otherwise, invalidating the enable signal sent by the digital signal processor. And simultaneous conduction of upper and lower tubes of the same bridge arm of the IGBT inverter bridge is avoided.

The invention provides a medium-frequency induction heating power supply control method based on fuzzy neural network BP-PI control, and belongs to the technical field of induction heating power supplies, and the method comprises the steps: collecting current and voltage signals in real time, and determining the real-time power; according to the difference value between the real-time power and the target power, a bridge arm of an LLC load resonance circuit is controlled through a PWM driving signal, and power adjustment is carried out; determining a resonant frequency, and obtaining a frequency error between the output frequency and the resonant frequency of the current full-bridge IGBT inverter circuit end and a frequency error change rate; and according to the frequency error and the frequency error change rate, outputting adjustment amounts of a proportionality coefficient and an integral coefficient of a PI controller through a fuzzy BP neural network, dynamically adjusting the proportionality coefficient and the integral coefficient, and determining a frequency adjustment amount of the LLC load resonance circuit for frequency tracking. According to the control method, the LLC load resonance circuit and the full-bridge IGBT inverter circuit are combined to realize medium-frequency heating, the problem of resonant frequency drift caused by workpiece heating and load change is solved, and the power supply efficiency and the power stability are improved.

The invention discloses an alternating-current and direct-current power supply control system, which comprises a three-phase full-bridge rectifier used for receiving an input voltage of a three-phase power grid, converting the input voltage into a direct-current voltage with pulsation and sending the direct-current voltage to an LC filter module; the LC filtering module is used for carrying out filtering processing on the direct-current voltage with pulsation, and smooth direct-current voltage is obtained after filtering; the IGBT inversion module is used for receiving the smooth direct-current voltage, performing inversion according to a PWM control signal output by the main control board, generating alternating-current and direct-current pulse voltages required by the isolation transformer and sending the alternating-current and direct-current pulse voltages to the isolation transformer; the isolation transformer forms a secondary voltage and sends the secondary voltage to the output filtering module; and the output filtering module is used for filtering the secondary voltage. And an IMDC comprehensive judgment channel is additionally arranged on the basis of an original single-loop full-digital closed loop, so that faster voltage stabilization response is realized when the load is suddenly changed or the input fluctuates, and the switching loss and the protection margin are simultaneously considered in a full-power range.

The invention discloses a welding power supply based on a capacitor energy storage and intermediate frequency inversion hybrid technology, which integrates capacitor energy storage (CDW) and intermediate frequency inversion (MFDC) technologies, and comprises a three-phase power supply input module, a voltage regulating circuit, a boosting transformer, a rectifier module, an energy storage capacitor bank, a bridge type IGBT inversion circuit, an intermediate frequency transformer bank, a secondary rectifier and a main control unit. The three-phase power supply charges the energy storage capacitor group after voltage regulation, voltage boosting and rectification; after starting, the main control unit calls a preset welding specification, the bridge type IGBT inverter circuit is controlled to output current at the frequency of 1000 Hz, and direct-current welding current is formed after the current is processed by the medium-frequency transformer set (capable of being expanded in parallel) and the secondary rectifier. The power supply has the advantages of low input power of capacitor energy storage and accurate control of intermediate-frequency inversion, realizes rapid large-current output, is energy-saving and efficient, improves welding quality and equipment universality, and is adaptive to multi-scene welding requirements.

The application belongs to the technical field of pulse power supply, and provides a single / dual-polarity nanosecond pulse switchable power supply discharge system, which solves the problem that the traditional nanosecond pulse power supply cannot simultaneously meet the output requirements of high repetition frequency, high voltage amplitude, fast rising edge and single / dual-polarity pulse mode switching. The system comprises a driving module, an IGBT inverter circuit, a filter input circuit, a ZVS resonant circuit, a pulse transformer, a magnetic compression circuit, a single / dual-polarity conversion module and a dual-polarity pulse electrode. After receiving the IGBT inverter circuit control signal, the IGBT inverter circuit is sequentially connected in forward and reverse directions. The filter input circuit inputs electric energy to the magnetic compression circuit after being boosted by the IGBT inverter circuit, the ZVS resonant circuit and the pulse transformer. The magnetic compression circuit shortens the pulse rising edge and pulse width, and the single / dual-polarity conversion module outputs high-voltage single / dual-polarity nanosecond pulses to the dual-polarity pulse electrode to generate discharge. The system can output high-voltage nanosecond single / dual-polarity pulses in a high repetition frequency working mode.

The present invention discloses an ECM motor, HVAC system, and signal conversion method compatible with multiple universal interfaces. The ECM motor includes a motor body and a motor controller. The motor controller includes a control circuit board, which includes a power supply, a microprocessor, an IGBT inverter circuit, and multiple universal interface modules. The multiple universal interface modules are at least two of a multi-pin communication interface module, a multi-line communication interface module, a multi-speed control interface module, or a PWM signal communication interface module. Based on the interface signal conditions of the connected HVAC system, one of the multiple universal interface modules can be selected to establish a communication mode connection between the microprocessor and the HVAC system. This method effectively coordinates the connection between the HVAC system control board and the motor, improves compatibility, and greatly facilitates aftermarket repairs.