134 results about "Thyristor drive" patented technology

The invention discloses a two-phase STATCOM (Static Synchronous Compensator) management device on a traction side of an electrified railway, and a control method of the device. The device is connected with a two-phase power supply arms on a secondary side of a traction transformer in parallel, and comprises converter equipment and a control system. The converter equipment comprises two single-phase full-bridge inverters with a back-to-back structure form, and two groups of passive filters, wherein the transfer of active power between the two power supply arms can be realized through the control on capacitor voltage on a shared direct current side, and thus the load of two phases can be balanced; the two groups of passive filters are used for compensating harmonic wave and reactive power. The control system comprises a data acquisition system, a master control system, a PWM (Pulse-Width Modulation) signal generation system and a thyristor driving system. The device is arranged on a low-voltage side, so that the capacity demand of the device is reduced, the cost of the device is lowered, and the reliability of the device is improved.

The present invention relates to a power network voltage drifting-down generator, comprising a thyristor control circuit(1), an isolating transformer(5), a step-down transformer(3), a bypassing thyristor(2), a starting thyristor(4) and a thyristor drive circuit. The thyristor control circuit(1) is used for detecting the input voltage signal, deciding the continuity signals of the reverse parallel connection thyristor. The bypassing thyristor(2) and the starting thyristor(4), sending the actuating signal of the reverse parallel connection thyristor at the zero crossing point of the input signal, the running state of the step-down transformer(3) is controlled through the bypassing thyristor(2) and the starting thyristor(4), changing the value of the input voltage. The present invention is capable of realizing the instant change to the input voltage.

The invention provides a digital variable frequency defibrillator which comprises a digital controller and a pulse output circuit, wherein the pulse output circuit comprises a power supply, a half-bridge inverter circuit, a pre-transformer, a full-bridge rectifier circuit, a soft switching circuit, a voltage division circuit, an LC (inductance-capacitance) resonance circuit, a post transformer and a discharge electrode which are sequentially connected; the power supply, the half-bridge inverter circuit, the full-bridge rectifier circuit, the soft switching circuit, the voltage division circuit and the LC resonance circuit are respectively connected with the digital controller by a power supply voltage detection circuit, a half-bridge inverter MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving circuit, a soft switching MOSFET driving circuit, an after-rectifying voltage monitoring circuit and an LC resonance thyristor driving circuit. The invention also discloses a variable frequency pulse control method, solves the problems of uncontrollability of pulse frequency and low utilization rate of energy in the prior art and improves working efficiency, reliability and service life of a system.

In a cycloconverter generator, there are provided, q number of power circuits that supply rectified DC power of a DC power supply unit as operating power to the p (p>q) number of thyristors, and r (p>r) number of thyristor drive circuits that are connected to the q number of the power circuits and drive the p number of the thyristors, wherein the r number of the thyristors drive circuits are individually used to drive in common ones among the p number of the thyristors whose operation is unaffected even if driven at the same timing such that the number r of the drive circuits is made smaller than the number p of the thyristors, thereby enabling to simplify circuit configuration.

The performance of a generator is improved in a higher range of the output by correcting a decrease in the average direct current voltage supplied to an inverter. An average calculator 95 calculates an average of direct current voltage inputs to the inverter 4 for comparing with a target voltage (level) VDC. When it is judged by an average voltage deviation detector 96 that the average is smaller by a specific amount than the target voltage level, the target voltage level is increased by an adjusting unit 98. A conductor angle setting unit 93 determines the conduction angle of thyristors to change the voltage input of the inverter (4) to an adjusted target voltage level VDCm. A thyristor drive circuit 94 controls the conduction of the thyristors in the converter 3 according to the conduction angle.

The invention discloses an intelligent control device based on Lonworks electric power carrier communication, which comprises an electric power carrier communication substrate and a power electronic device monitoring controlling application plate. The electric power carrier communication substrate is in communication with a monitoring host through a Lonworks network. The electric power carrier communication substrate comprises a power supply module, a PL3120 communication control module and a coupling circuit. The power electronic device monitoring controlling application plate is in communication with the electric power carrier communication substrate through an input / output (IO) pin. The power electronic device monitoring controlling application plate comprises an over-current detection module and a thyristor drive output module which is directly connected with a controlled device. The intelligent control device based on Lonworks electric power carrier communication is capable of lowering construction cost of a monitoring system and reducing occupied space and difficulty in maintenance at a later stage, and is especially suitable for places where line laying-out cannot continue in civil air-defense construction or occasions when wall chiseling and pipe penetrating absolutely cannot occur after a structure is finished in civil air-defense construction.

The invention discloses a dynamic switching control device for an uninterruptible power supply system to add an impulsive load suddenly, which comprises a main circuit and a control circuit. The control circuit comprises a Hall current sensor, a current filter, a current sampling circuit, a contact detection unit, a contractor coil drive unit, a subtractor, a comparer, a switching order controller, a PWM drive circuit and a by-pass thyristor drive circuit. When current acquisition values are continuously larger than a given reference value for three times within three on-off cycles, the switching order controller sends out a signal to switch on a by-pass thyristor and sends out another signal to switch off a contactor coil at the same time, thereby realizing the simultaneous power supply of a bypass and an inverter circuit of the main circuit. When the contact detection unit detects that a contact of the contactor is switched off, the switching order controller sends out a signal to block a PWM pulse, thereby realizing the independent power supply of the bypass of the main circuit. The invention can realize instant and quick switching when the uninterruptible power supply system adds the impulsive load suddenly without increasing the equipment cost, and can effectively solve the voltage sag and interruption of output voltages.

The invention discloses a distributed generation reactive compensation device, relating to a grid compensation device and providing a distributed generation reactive compensation device which can operate stably and cannot generate resonance. The distributed generation reactive compensation device is provided with a thyristor controlled reactor, a fixed capacitor group, an active power filter and a control circuit, wherein the thyristor controlled reactor is directly connected with a power grid in parallel; the fixed capacitor group is connected with the active power filter in series and is then connected to the power gird; a driving pulse signal end of the control circuit is respectively connected with the thyristor controlled reactor and the active power filter. The control circuit can be provided with a grid voltage and current sampling circuit, a digital signal processing (DSP) controller, an IPM (Intelligent Power Module) driving circuit, a thyristor driving circuit, a liquid crystal display and a protection circuit.

The invention discloses a fuzzy control strategy-based asynchronous motor soft starter. The soft starter comprises a central processing unit (CPU), a three-phase power supply, a power supply module, a keyboard module and a display module, wherein the three-phase power supply is connected with the CPU through a current detection module and an analog / digital (A / D) conversion module. The soft starter is characterized by also comprising a joint test action group (JTAG) simulation debugging module, a thyristor conduction angle measuring circuit and a thyristor driving voltage regulating circuit connected with the CPU, wherein the thyristor driving voltage regulating circuit is connected with a motor. The fuzzy control strategy-based asynchronous motor soft starter can simultaneously provide two start modes for a user to select, and in the two start modes, the thyristor trigger angle is calculated by adopting a fuzzy control table. Compared with the traditional thyristor soft starter, the fuzzy control strategy-based asynchronous motor soft starter has the advantages of strong interference resistance, high control speed, high robustness, strong adaptability and the like.

The invention relates to an efficient coupling energy taking based high-voltage TSC driving device, belongs to the technical field of high-voltage TSC driving, and aims to solve problems such as poor isolation intensity and poor anti-interference ability of a high-voltage TSC driving device at present. The efficient coupling energy taking based high-voltage TSC driving device comprises a signal conditioning module, a control module, an optical fiber transmission module, a DC power supply circuit, a coupling energy taking circuit and a TSC driving circuit, and is characterized in that three-phase voltage and three-phase current at a load side of a power distribution network are inputted into the signal conditioning module, voltage and current signals outputted by the signal conditioning module are transmitted to the control module, switching signals outputted by the control module are transmitted to each thyristor driving board of the TSC driving circuit through an output end of the optical fiber transmission module; high-frequency output of the DC power supply circuit is transmitted to the coupling energy taking circuit, and the coupling energy taking circuit provides a working power supply for each thyristor driving board of the TSC driving circuit; and the thyristor driving boards output driving signals to gate poles of thyristors according to zero-cross detection signals and the switching signals of the corresponding thyristors. The efficient coupling energy taking based high-voltage TSC driving device is used for driving high-voltage thyristors.

The invention discloses a two-circuit power supply high-voltage frequency converter unit bypass device based on a thyristor. The two-circuit power supply high-voltage frequency converter unit bypass device comprises a two-circuit power supply AC (Alternating Current) / DC (Direct Current) power supply, a thyristor driving plate, a thyristor and an anti-parallel diode rectifier bridge of the thyristor, wherein the two-circuit power supply AC / DC power supply supplies power to the thyristor driving plate; the thyristor driving plate communicates with a unit control plate through a fiber; the thyristor driving plate is connected with the thyristor to control the thyristor to be switched on and off; and the thyristor provided with the diode rectifier bridge is connected to the output end of the high-voltage frequency converter unit in parallel. When devices including an IGBT (Insulated Gate Bipolar Translator), a rectifier module and the like in a power unit fail, a function that the power unit and other power units are removed is realized. The two-circuit power supply high-voltage frequency converter unit bypass device adopts a two-circuit power supply way, and is provided with a thyristor adsorption circuit to effectively adsorb a voltage spike generated when the thyristor acts, and therefore, the reliability of a power unit bypass system is greatly improved.

The invention discloses a quick arc extinguishing system and method for a single-phase ground fault of a low-current ground system. The quick arc extinguishing system comprises a ground line selection device, an inverse parallel thyristor group and a thyristor driving device. The ground line selection device adopts bus three-phase voltage and zero-sequence voltage, judges whether a ground fault exists according to the zero-sequence voltage and judges the ground phase according to the voltage drop phase in the three-phase voltage after single-phase grounding happens, and then the thyristor group driving device triggers the inverse parallel thyristor group to be turned on, the fault phase is directly grounded, and the voltage between the fault phase and the ground is pulled down, so that the accidents of arcing over voltage, cable burnout, personal casualty and the like in the continuous operation process after grounding are prevented.