11 results about "Igbt inverter" patented technology

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 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 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.

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 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 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.