40 results about "Thyristor drive" patented technology

The invention relates to the field of static frequency converters, and discloses a static frequency converter protection system comprising a control unit used for generating a control signal and performing bidirectional communication with a valve control unit through an optical fiber; the thyristor control unit obtains energy through a circuit and sends a first return signal after energy obtaining is completed; and the valve control unit is used as a bridge between the control unit and the thyristor control unit and is used for receiving and collecting the first return signal. When the forward voltage of the thyristor driven by the thyristor control unit exceeds a set protection value, the thyristor control unit triggers the thyristor emergently, and returns an overvoltage protection signal to the valve control unit at the same time. The valve control unit gathers overvoltage protection signals, and when the number of the thyristors subjected to overvoltage protection at the same time is larger than a tripping constant value set by the valve control unit, the valve control unit sends a tripping request signal to the control unit to inform the control unit of interlocking tripping.

The application discloses a thyristor trigger signal and driving circuit for non-controlled rectification of a direct-current bus voltage, comprising a voltage comparison unit, a pulse wave generation unit, a trigger signal unit and a driving unit; the voltage comparison unit is used for judging a thyristor opening time and sending an output effective level signal to the trigger signal unit; the pulse wave generation unit is used for generating a frequency-adjustable pulse wave and sending the pulse wave to the trigger signal unit; the trigger signal unit is used for synthesizing a trigger signal based on the effective level signal and the trigger signal and sending the trigger signal to the driving unit; and the driving unit is used for controlling conduction of the thyristor based on the trigger signal. The application greatly improves reliability of the thyristor driving, avoids problems of power waste and large loss of a driving power supply, and can be applied to high-power frequency converter products in batches.

This application provides a leakage current controller. An AC voltage is obtained from the power line through a rectifier circuit, converted to DC voltage, and transmitted to a thyristor drive circuit. The control circuit can transmit a control signal to the thyristor drive circuit when the sampled signal is greater than a threshold signal. Thus, the reverse-current circuit can generate a drive signal based on the control signal after a preset time and transmit the drive signal to the thyristor drive circuit. In this way, when the DC voltage is at a first level, the thyristor drive circuit can drive the trip unit to operate according to the drive signal to achieve the reverse-current function. Furthermore, when implementing the reverse-current function, the first step-down circuit can use the voltage on the first capacitor in the first step-down circuit to supply power to the control circuit, which can prevent the large current on the trip unit from pulling down the power supply voltage of the control circuit. Therefore, damage to the trip unit can be avoided, and the service life of the trip unit can be improved.

The invention discloses a pulse generation module based on a high-voltage fast thyristor, a module group and a pulse generation method, and solves the problems that a pulse generation module adopting an IGBT switch is low in single-tube power density, complex in synchronous control, easy to interfere and relatively complex in driving, and the pulse generation module specifically comprises a charging unit, a fast thyristor K, a driving circuit D, a PFN unit and an output unit; the charging unit comprises a charging port INA, a charging isolation diode DC, a charging port INB and a charging current-limiting resistor RC; the charging isolation diode DC and the charging current-limiting resistor RC are connected with the PFN unit through a fast thyristor K, and the fast thyristor K is also connected with a driving circuit D; the PFN unit comprises a PFN0, a PFN1 and a fly-wheel diode DS; the output unit comprises an output port OUTA and an output port OUTB; the output port OUTA is connected with the c end of the PFN1; and the output port OUTB is connected with the d end of the PFN0. Compared with an IGBT (Insulated Gate Bipolar Transistor), the high-voltage fast thyristor has the advantages of high single-tube power density, simplicity in driving, strong anti-interference capability and the like.

The utility model discloses a frequency conversion driving system with an energy recovery function for a central air conditioner, comprising a rectification assembly comprising an RBR / S / T thyristor and a thyristor driving IR / S / T driving board, and the RBR / S / T thyristor is connected with the thyristor driving IR / S / T driving board in a three-phase half-control rectification mode and is used for converting input commercial power AC voltage into DC voltage; in the capability recovery link, the DC / AC transformation module is divided into two parts, namely an IL module and an IN module; the public energy storage link is bridged behind the rectification assembly and comprises N capacitors C1 to CN which are connected in series; and each inversion assembly comprises three IU / V / WIGBT modules and three IU / V / WQ driving boards, and each IU / V / WIGBT module is directly connected with one IU / V / WQ driving board to form an inversion bridge. Low-voltage charging is provided in the charging process, which is safer and more reliable; and inertia energy of the motor can be recycled under emergency power failure, the energy utilization rate is improved, and environmental protection is achieved.

The invention relates to a power control and regulation circuit, in particular to an oscillation circuit and a thyristor driving circuit. A Discharge pin of the NE555DR chip is connected with a first modulation circuit unit which is used for adjusting the output duty ratio and the PWM waveform frequency of the NE555 chip, a Reset pin of the NE555DR chip is connected with a control signal input end, the Reset pin is connected with a signal pull-down unit, and the signal pull-down unit is connected with the first modulation circuit unit. After the pull-down unit is connected to the RESET pin, the RESET pin is kept at a low level in a normal state, after a control signal input end inputs a signal, the RESET pin reaches a high level, and the NE555DR chip starts to work to output a PWM (Pulse Width Modulation) signal. The charging and discharging characteristics of the waveform modulation capacitor are controlled through the first modulation resistor and the first modulation diode which are connected in parallel, so that the NE555DR chip outputs a PWM waveform signal, a control signal is accessed, the chip starts to work only when the control signal is input, the PWM signal is output to the outside, and the waveform integrity of the PWM signal is ensured.

The utility model discloses a kind of intelligent controller's commutation module of multi-rotation electric actuator, comprising first thyristor, second thyristor, first relay, second relay, third relay, fourth relay and the device composition solid-state composite switch circuit, including relay drive interlock circuit, thyristor drive circuit, relay enable signal interface, thyristor enable signal interface, three-phase alternating current arbitrary two-phase interface, three-phase motor arbitrary two-phase interface simultaneously.This utility model is in combination application of relay thyristor, ensure electrical safety, electromagnetic compatibility performance is better;Through the above-mentioned circuit and signal interface, power input / output interface, realize electrical topology on self-contained system, physical structure is separable module, and then realize the flexible installation of wide position of commutation module, while effectively avoid the series problem caused by driving and control integration together.

The invention discloses a surge suppression circuit and an electronic device. The electronic device comprises a series loop formed by a rectification circuit and a capacitor. The surge suppression circuit comprises a current-limiting resistor, a thyristor, a driving enhancement module and a driving and power supply module, the current-limiting resistor and the thyristor are connected in parallel and then connected to a series loop, a first end of the driving enhancement module is connected with a control electrode of the thyristor, a second end is connected with an anode of the thyristor, and an output end of the driving and power supply module is connected with a third end of the driving enhancement module; the driving enhancement module comprises a first switch tube, and the driving and power supply module comprises a second switch tube; after the electronic device is started, when the voltage at the two ends of the capacitor achieves the effect of suppressing input impact current or inputting lightning surge, the second switch tube is conducted, and the driving and power supply module provides first driving current for the thyristor through the driving enhancement module and conducts the first switch tube. The conduction of the first switch tube enables the voltage output by the rectification circuit to provide a second driving current for the thyristor through the driving enhancement module. The reliability can be improved.

The present invention provides a thyristor drive circuit and a dimming device. In the thyristor drive circuit, the fourth pin of the transformer is connected to the target voltage terminal for outputting the target voltage, and this target voltage terminal is not only connected to the voltage source of the power integrated circuit, but also connected to the voltage input terminal of the control circuit and the first main terminal of the thyristor. Therefore, in this application, in order to drive the thyristor, it is not necessary to provide a dedicated power supply winding for the power integrated circuit and a dedicated power supply winding for the thyristor on the primary side of the transformer. Instead, the power integrated circuit and the thyristor share the power supply winding, thereby reducing the number of pins on the primary side of the transformer and making the selection range of the transformer model larger.

This invention proposes a motor control system, control method, and motor system. The motor control system includes a motor drive circuit and a load control circuit. The motor drive circuit has a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a ground potential terminal. The motor drive circuit is used to convert AC power from an AC power source into chopped AC power before applying it to the motor. The motor drive circuit includes a chopper circuit. The load control circuit includes a first thyristor and a thyristor drive circuit. The first terminal of the first thyristor is coupled to a first load, and the thyristor drive circuit is coupled to the gate of the first thyristor. The load control circuit is used to control the on / off state of the power supply circuit in which the first load is located. The motor control system, control method, and motor system proposed in this invention effectively simplify the power supply configuration of the motor control system and solve the problem of isolated communication, realize efficient, quiet, and stepless speed regulation of the motor, and simplify the load control circuit of the first load.

A short-circuit protection test circuit and method for AC charging piles based on quantitative analysis is disclosed. The circuit includes: a current transformer (1), a short-circuit resistor array (2), a DSP processing unit (4), a human-machine interaction unit (5), a thyristor drive circuit (6), and a sampling module. The primary side of the current transformer (1) is connected to the neutral line, and the secondary side is connected to the input terminal of the sampling module. One end of the short-circuit resistor array (2) is connected to the neutral line, and the other end is connected to the live line. The short-circuit resistor array (2) includes multiple parallel short-circuit resistor branches, each including a short-circuit resistor and a controllable switch connected in series. The DSP processing unit (4) is connected to the output terminal of the sampling module, the human-machine interaction unit (5), and the thyristor drive circuit (6) to calculate I. 2 t, receives input from the human-machine interaction unit (5), outputs test results to the human-machine interaction unit (5), and determines the number of short-circuit resistance branches to be put into short-circuit protection test.

This invention discloses a balanced drive power component and a converter. In the balanced drive power component, a first switch module and a second switch module, including drive connectors and multiple switch modules, are arranged in the switch wiring area of ​​the circuit board. A capacitor module is also arranged on one side of the switch wiring area. Each switch module includes several individual transistors, which cooperate to achieve a controllable switching function and form an input terminal, an output terminal, and a drive terminal. The individual transistors are diodes, transistors, MOSFETs, or thyristors. The drive connectors are connected to the drive terminals of each switch module in their respective switch modules via circuits on the circuit board, and the circuit lengths connecting the connectors to each switch module are consistent. This balanced drive power component can reduce the overall cost of the converter despite the high price of IGBT modules.

This application relates to the technical field of thyristor drive circuits, and in particular to a Schmitt trigger circuit for a thyristor magnetization system. It includes an isolated power supply unit, an energy storage unit, a trigger pulse receiving unit, and a Schmitt strong pulse forming unit. The isolated power supply unit includes an isolation transformer and a filter capacitor. The energy storage unit consists of a charging resistor and an energy storage capacitor connected in series. The trigger pulse receiving unit receives external trigger commands. The Schmitt strong pulse forming unit includes an NPN transistor, a MOSFET switch, etc. These units cooperate with each other. The application also covers parameter limitations and electrical isolation settings for each component. This circuit can be applied to high-power, high-voltage, strong magnetic pulse magnetization equipment. This application achieves electrical isolation and equivalent Schmitt trigger characteristics, providing nanosecond-level steep-front strong trigger pulses to the thyristor, thereby reducing turn-on losses, improving di / dt tolerance, and enhancing electromagnetic interference immunity.

This invention discloses an arc-free circuit breaker and control method for power distribution areas. It connects a microprocessor to a voltage sensor, a current sensor, a mechanical circuit breaker, a GPS module, a wireless communication module, a thyristor drive circuit, and an inverter. The microprocessor receives the induced signals from the voltage and current sensors, the clock signal from the GPS module, and the control information from the wireless communication module. Based on these signals, the microprocessor calculates the operating status of the power distribution area and controls the mechanical circuit breaker, thyristor drive circuit, and inverter according to the calculation and analysis results. This solves the problem that traditional circuit breakers can no longer meet the increasing demands of photovoltaic power generation, charging piles, and other new energy sources in power distribution areas.

The invention discloses an AC controller circuit capable of speed regulation and steering control, and the circuit comprises a current sampling module which is used for sampling the working current of a motor; the silicon-controlled driving speed regulation module is used for controlling the rotating speed of the motor; the forward and reverse rotation relay control module comprises four groups of relays and controls forward rotation or reverse rotation of the motor through the four groups of relays; the control chip is used for acquiring the working current of the current sampling module and outputting a control signal to the silicon controlled rectifier driving speed regulation module and the forward and reverse rotation relay control module according to the working current; the power supply module provides a high-voltage power supply for driving the relay and a low-voltage power supply for driving the control chip, and the low-voltage power supply is obtained after the high-voltage power supply is processed by the voltage division module; the silicon controlled rectifier driving speed regulation module, the current sampling module and the control chip module share the same grounding point. The device is simple in structure, low in cost and capable of stably controlling operation of the motor.

The embodiment of the utility model provides a thyristor driving circuit, and the circuit comprises a main control chip which is configured to output a low-frequency driving signal and a high-frequency driving signal; the driving circuit is configured to generate a forward voltage signal based on the low-frequency driving signal and the high-frequency driving signal, and the forward voltage signal is used for being output to the thyristor to drive the thyristor; and the temperature sampling circuit is configured to sample the temperature of the thyristor to obtain a sampling signal and output the sampling signal to the main control chip, so that the main control chip adjusts the duty ratio of the low-frequency driving signal and / or the high-frequency driving signal. According to the thyristor driving circuit provided by the embodiment of the invention, the duty ratio of the low-frequency driving signal and / or the high-frequency driving signal can be adjusted along with the temperature change of the thyristor, so that the trigger current of the thyristor can be adjusted, the thyristor can be reliably conducted at different working temperatures, the driving stability of the thyristor can be improved, and the service life of the thyristor can be prolonged. And the loss of the thyristor is reduced.

The application provides a short-circuit control system and method for a small-current grounding fault simulation test, and belongs to the technical field of power system fault simulation. The system solves the problem that the control precision and cost of the initial phase angle of the existing fault simulation device are difficult to be considered, and the simulation reliability of the transition resistance is low. The system comprises a main circuit and a control circuit. The main circuit is provided with a transition resistance circuit and a bidirectional thyristor in series. The control circuit comprises a synchronous transformer, a zero-crossing detection circuit, a single-chip microcomputer control unit and a thyristor drive circuit which are sequentially connected by signals. The system voltage zero-crossing point is locked by the zero-crossing detection. The bidirectional thyristor is triggered by the single-chip microcomputer according to the preset fault initial phase angle and the transition resistance circuit with multiple fixed resistance parallel connections to realize the grounding fault simulation. The application has the advantages of accurate control, low cost and high reliability, and can be widely applied to the power system fault simulation test and the performance test of the line selection device.

The combined thyristor driver comprises one or more first function modules, each first function module comprises a circuit board and a loading shell used for packaging the circuit board, a first surface of each first function module is provided with a first connecting part, a second surface opposite to the first surface is provided with a second connecting part, and the first connecting part is connected with the second connecting part. The first surface is provided with a first connecting part, the second surface is correspondingly provided with a second connecting part, and when the first connecting part of one first function module is connected to the second connecting part of the other first function module, the first connecting part is connected to the second connecting part of the other first function module; and the first connecting part of one first functional module is connected with the second connecting part of the other first functional module to form electrical connection. According to the combined thyristor driver, the functions of the driver are divided, physical separation and rapid connection design are carried out physically, and physical combination and electrical connection with other drivers are achieved through reasonable mechanical interface and electrical interface / bus connection.

The application discloses a kind of overvoltage protection circuit and control method of turn-off thyristor, belong to electronic circuit technical field, wherein protection circuit includes: turn-off circuit, first opening circuit, second opening circuit and voltage sampling module.The protection circuit of the application realizes when the voltage between the anode and cathode of turn-off thyristor device approaches or exceeds the threshold of voltage resistance in the whole process of driving power-on / power-off, triggers turn-off thyristor device to open, so as to avoid overvoltage breakdown of turn-off thyristor.The protection circuit of the application does not change the structure of existing turn-off thyristor drive circuit, only adds several new circuit modules, and optimizes the on-off characteristic of original turn-off circuit when power-off, greatly reduces the cost of circuit reconstruction, while improving the reliability of action.The protection circuit drive control method of the application can effectively avoid protection circuit malfunction and refusal.

The application discloses a control method and system for realizing soft starting of a thyristor rectifier bridge, and belongs to the technical field of power generation, power transformation or power distribution. According to the real-time obtained power grid voltage parameters and the power grid voltage frequency, the application introduces specific logic to accurately identify the half-cycle position of the power grid voltage, reduces the frequency measurement error caused by power grid voltage distortion, accurately generates the thyristor driving pulse according to the obtained power grid voltage frequency, introduces a thyristor turn-off point automatic correction algorithm, automatically adjusts the phase of the thyristor driving pulse cycle by cycle, avoids the failure of the thyristor slow starting, and thus ensures the reliable and accurate generation of the thyristor driving pulse.

The utility model discloses a silicon controlled rectifier-based protection circuit and a switching power supply. The protection circuit comprises a silicon controlled rectifier module, a soft start circuit, a silicon controlled rectifier drive circuit, an input detection circuit and an output detection circuit, wherein the silicon controlled rectifier module is electrically connected with the soft start circuit, the silicon controlled rectifier drive circuit, the input detection circuit and the output detection circuit are connected through diodes D1 and D2, and the silicon controlled rectifier module is connected with the silicon controlled rectifier drive circuit through a relay K1. The switching power supply comprises a main circuit, a control and auxiliary circuit and the protection circuit. According to the utility model, stable and adjustable output voltage is realized by utilizing the characteristics of on-off of the high-frequency switching tube and energy storage of the inductor.

The application discloses a current mode thyristor driving circuit, which comprises an independent driving type push-pull triode circuit, an eighth resistor, a first MOS tube, a transformer and a fifth resistor; one end of the eighth resistor is connected with a control output end of the independent driving type push-pull triode circuit, and the other end of the eighth resistor is connected with a gate of the first MOS tube; a drain of the first MOS tube is connected with one end of a primary winding of the transformer, and a source of the first MOS tube is grounded; the other end of the primary winding of the transformer is connected with a power supply; one end of a secondary winding of the transformer is connected with one end of the fifth resistor and a gate of the thyristor, and the other end of the secondary winding of the transformer is connected with the other end of the fifth resistor and a cathode of the thyristor. The driving circuit uses the input differential signal with opposite high and low levels to adjust the opening time of the MOS tube and obtain different peak currents, thereby improving the flexibility and practicability of the driving circuit, avoiding additional power loss and reducing heat generation.

The application discloses a thyristor control surge current suppression method suitable for wide voltage and wide frequency, which comprises the following steps: a sampling circuit rectifies an input alternating current signal of a main power circuit into a half wave, and divides voltage to obtain an input voltage sampling signal; the voltage sampling signal is transmitted to an input voltage parameter acquisition module, the voltage parameter acquisition module calculates an input voltage average value, an input voltage filter value and a sampling period counter value; the input voltage average value, the input voltage filter value and the sampling period counter value are input into an input voltage period and thyristor opening time calculation module to calculate an input voltage period and a thyristor opening time; the sampling period counter value, the input voltage period and the thyristor opening time are collectively used as inputs of a thyristor driving pulse generation module to generate a thyristor driving pulse. The application has surge suppression functions at low frequency and high frequency.

The utility model discloses a silicon controlled rectifier control circuit for an electric vehicle charger, which relates to the technical field of electronic circuits and comprises a silicon controlled rectifier SCR1, a first rectifying and filtering unit and a silicon controlled rectifier driving control unit which are adaptively connected. The cathode of the silicon controlled rectifier SCR1 is connected with the anode of the battery, and the output cathode of the electric vehicle charger is connected with the cathode of the battery and is grounded; the first rectifying and filtering unit is used for providing conduction voltage for the silicon controlled rectifier SCR1, and the silicon controlled rectifier driving control unit is used for controlling the conduction state of the silicon controlled rectifier SCR1. The silicon controlled rectifier control circuit can further improve the safety and reliability of the charging process of the electric vehicle charger.

This utility model discloses a drive circuit that maintains driving capability after power failure. The drive circuit includes a switching signal circuit unit and a thyristor drive circuit unit. The switching signal circuit unit is a signal triggering circuit that triggers a drive signal to the thyristor drive circuit unit. The switching signal circuit unit includes a power failure sustaining module, a switching module, a voltage regulation and filtering module, and a switching signal module. The power failure sustaining module is connected to the voltage regulation and filtering module and the switching signal module through the switching module, and the voltage regulation and filtering module is connected to the switching signal module. The switching signal module is connected to the thyristor drive circuit unit, and the thyristor drive circuit unit receives the drive signal from the switching signal module to drive the circuit. The power failure sustaining module includes a capacitor sustaining unit, which sustains discharge of the circuit after power failure.

The utility model discloses a kind of thyristor drive circuits for driving automatic transfer switch, the automatic transfer switch is used to selectively connect normal power supply or standby power supply to load, the thyristor drive circuit includes normal power supply side thyristor drive circuit and standby power supply side thyristor drive circuit, and the normal power supply side thyristor drive circuit and standby power supply side thyristor drive circuit independently include: automatic / manual selection unit, voltage level detection circuit unit, gate on-circuit unit, holding circuit unit, timing switch circuit unit, gate off-circuit unit, the timing switch circuit unit is connected in parallel with the gate off-circuit unit in thyristor gate.The utility model not only can effectively solve the problem of thyristor misdirect on, can guarantee that automatic transfer switch can reliably, safely operate under any working condition, and circuit structure is simple, can significantly reduce the manufacturing cost and maintenance cost of drive circuit.

The utility model discloses an LED high-voltage dimming control system which comprises a system power supply module, a phase zero-cross detection circuit module, a bidirectional silicon controlled rectifier drive circuit module, an AD conversion circuit module, a communication display module, an LED lighting load and an MCU single-chip microcomputer control center unit. The stability is higher; the MCU single-chip microcomputer controls accurate program delay calculation of pulses output by the center unit, so that the dimming fineness is ensured, and the dimming of the LED lighting load is smoother.

The utility model relates to an impulse current suppression circuit and a switching power supply, the impulse current suppression circuit comprises a rectification circuit, a first bridge arm comprises a diode D1 and a silicon controlled rectifier SCR1, a cathode of the diode D1 and an anode of the silicon controlled rectifier SCR1 are connected together to form a first input end of the rectification circuit, and the first input end is used for being connected with a first phase input end of the switching power supply; the cathode of the silicon controlled rectifier SCR1 is connected with the positive output end of the rectifying circuit; the anode of the diode D1 is connected with the negative output end of the rectifying circuit; the first silicon controlled rectifier driving circuit is connected between the trigger electrode and the cathode of the silicon controlled rectifier SCR1; the first detection control circuit is used for detecting a voltage difference between an anode and a cathode of the silicon controlled rectifier SCR1, generating a control signal when the voltage difference is smaller than a set voltage, and controlling the silicon controlled rectifier driving circuit to provide a trigger signal for a trigger electrode of the silicon controlled rectifier SCR1; the silicon controlled rectifier is automatically closed when the anode voltage is lower than the cathode voltage. According to the utility model, impact current suppression can be realized without an impact current limiting resistor.

The utility model discloses a circuit switching device for an energy storage system. The circuit switching device is installed between every two same phases of two power supplies needing to be switched. The energy storage system circuit switching device comprises a main power supply input end, a standby power supply input end and an output end. The circuit switching device further comprises a switching device and a thyristor connected with the switching device. The thyristor is in communication connection with a thyristor driver; the switching device, the thyristor and the thyristor driver are all arranged in the outer shell. According to the utility model, when a certain phase goes wrong, only the corresponding circuit switching device needs to be replaced, and the whole switch box does not need to be replaced, so that the maintenance cost and time are obviously reduced, and the reliability of a system is improved.

This invention discloses an arc-free AC circuit breaker for distribution transformers with synchronous compensation capability and its control method. It connects a microprocessor to a voltage sensor, a current sensor, a mechanical circuit breaker, a GPS module, a wireless communication module, a thyristor drive circuit, and a power quality regulation module. The microprocessor receives the induced signals from the voltage and current sensors, the clock signal from the GPS module, and the control information from the wireless communication module. Based on these signals, the microprocessor calculates the operating status of the distribution transformer area and controls the mechanical circuit breaker, thyristor drive circuit, and power quality regulation module according to the calculation and analysis results. This solves the problem that traditional circuit breakers can no longer meet the increasing needs of photovoltaic power generation, charging piles, and other new energy sources in distribution transformer areas.