100 results about "Thyristor rectifier" patented technology

The invention discloses a thyristor rectifier bridge parallel operation full digital current homogenizing control device, which comprises a regulator, a rectifier cabinet controller, thyristor rectifier bridges and a detection component. The regulator is a master controller; the rectifier cabinet controller is a slave controller; a terminal signal processing module regulates terminal voltage and current signals of a generator, so that the terminal voltage and current signals are suitable to be output to an analog-to-digital conversion module of a regulator controller; and a synchronization signal processing module regulates the anode voltage of the rectifier cabinet thyristor rectifier bridges, so the anode voltage is suitable to be output to a pulse formation module of the regulator controller to serve as a synchronization signal of the anode voltage of the thyristor rectifier bridges. Due to the adoption of digital closed loop control, full digital intelligent current homogenization for a plurality of parallel operation thyristor rectifier bridges under full-motion environment is realized by real-time sampling and control.

A variable speed drive with a boost converter is provided for a chiller system driven by an induction motor. The boost converter can be a diode or thyristor rectifier followed by a boost DC/DC converter or a three-phase pulse width modulated boost converter. The boost converter provides a boosted voltage to the DC link, which results in a boosted voltage being applied to the induction motor by the inverter of the variable speed drive.

A variable frequency motor drive system configured such that the dc link capacitor charge is increased gradually, thus avoiding the above-mentioned transients. In the most preferred embodiment, the present invention ensures a gradual increase in the rectified voltage by providing the rectifier as a half-controlled thyristor rectifier (SCR) in place of the standard diode rectifier.

A method is disclosed to protect a power converter arrangement with a power converter that has a DC side that is connected to a DC intermediate circuit, an AC side, and controllable switches that can be controllably switched at a high frequency to invert the DC voltage of the DC intermediate circuit into an AC voltage. A protective device that can be activated and deactivated is provided to protect the power converter from overload by connecting an external thyristor rectifier bridge with a brake resistor (R_{b ext}) to the AC side of the power converter. If a predetermined error situation is detected, the external thyristors are triggered to turn on, to activate the protective device. If it is detected that the predetermined error situation has disappeared, the external thyristors are turned off. A power converter arrangement with a device to protect against overload is also disclosed.

A generation method of the driving waveform of a thyristor rectifier comprises the following steps that power grid voltage signals are collected, and a phase-locked loop follows power grid voltage and outputs a sinusoidal signal the same with the power grid voltage in direction; a reference waveform corresponding to a thyristor drive bridge arm is obtained by calculation according to the sinusoidal signal; the difference between the actual zero time of the reference waveform and the corresponding PWM break time is calculated; according to the time difference, the PWM break time is adjusted, so that a PWM control wave and the reference waveform are synchronous; according to the PWM control wave, a double-narrow pulse drive wave is output to control upper and lower thyristors on the corresponding thyristor drive bridge arm to work. According to the scheme, high-precision PWM control wave emission is achieved, breakover time control on the thyristors is more accurate, and working precision and stability of the thyristor rectifier are improved effectively.

The invented electro-static discharge (ESD) protection device utilizes the resistance-capacitance (RC) circuit to distinguish between the overshoot phenomenon caused at the moment of the power and the event of static discharge. Thus for example, the ESD protection device ensures the normal operation of the modified lateral silicon controlled rectifiers (MLSCR), prevents the MLSCR from the unexpected triggering caused by the overshoot at the moment of the power on so as to increases the effectiveness of he ESD protection device.

The invention discloses a high-power thyristor type traction rectifier and braking inverter bidirectional conversion system, and a control method. The system comprises an alternating-current switch cabinet, a phase-shifting transformer, a thyristor bidirectional conversion device, a direct-current switch cabinet and an isolation switch cabinet; and the thyristor bidirectional conversion device comprises rectifier and inverter units, which are connected in parallel, wherein the rectifier (inverter) unit comprises a filtering and reactive power compensation device, an autotransformer and a thyristor rectifier (inverter) device, which are sequentially connected in series. When two sets of 12-pulse rectifier power supplies are connected in parallel, the purpose that two sets of power suppliesare connected in parallel is achieved through a method for performing current-sharing control by adopting double closed-loop digital PI adjustment; the bidirectional conversion system disclosed by theinvention integrates the functions of energy feedback, traction power supply, steady network voltage, high power supply quality, high overload capacity and the like into a whole; and thus, the comprehensive cost performance of the system is high.

An electro-static discharge protection circuit and a semiconductor device having the same is disclosed. The electro-static discharge protection circuit has a current control circuit. The current control circuit has a first capacitive element. When the external source voltage is applied to the external source voltage supply line, the booster circuit in the internal circuitry boosts the internal source voltage of the internal source voltage supply line. The external source voltage becomes transiently greater than the internal source voltage at the early stage of the boosting step when the booster circuit boosts the internal source voltage based on the external source voltage. The first capacitive element restricts a current from flowing from the second terminal of the thyristor rectifier circuit to the internal source voltage, even when the external source voltage becomes transiently greater than the internal source voltage at the early stage of the boosting step when the booster circuit boosts the internal source voltage based on the external source voltage. This prevents the thyristor rectifier circuit from malfunctioning and turning on.

The invention discloses a charger automatically adaptive to the lead-acid battery pack voltage. The charger comprises an intelligent thyristor rectifier circuit, a switch power circuit, a voltage sampling circuit, a battery voltage detection circuit and a single chip computer control circuit, wherein a single chip computer outputs a control signal to the thyristor rectifier circuit according to the number of battery packs to control the conduction angle of the thyristor rectifier circuit; the more the number of the battery packs, the larger the controlled conduction angle of the thyristor and the higher the direct current voltage output by the rectifier; the single chip computer outputs a second signal to the voltage sampling circuit of a switching power supply for changing data of the voltage sampling circuit. Through coordination control in the two aspects, the ratio of a high value to a low value of the output voltage of the switching power supply is as high as 9.

The invention relates to a vehicle energy charge and control system, belonging to the charge and the control technology field. The invention is characterized in that a remote control transmitting device (1) is wirelessly connected with a remote control receiving device (2); the remote control receiving device (2) is connected with a constant current constant voltage charge controller (10); a current sensor (8) and a voltage sensor (9) are respectively connected with an output end of a thyristor rectifier circuit module (11) in series and parallel; the output ends of the current sensor and the voltage sensor are connected with the constant current constant voltage charge controller; a voltage-conditioning controller (3) and a current-conditioning controller (4) are connected with the input end of the constant current constant voltage charge controller; the output end of the constant current constant voltage charge controller is separately connected with a voltage indicator (6), a currents indicators (5) and the thyristor rectifier circuit module (11); the input end of the thyristor rectifier circuit module (11) is connected with a three-phase AC high-voltage power source. The invention realizes constant current constant voltage charge to a power battery and a super capacitor, manual regulation constant voltage and constant current setting values and display of the measurement voltage and operating current at real time.

The invention relates to a surface treatment method for aluminium alloy decorated board, the aluminium alloy is soaked in sulfuric acid solution, washed by clear water, dried naturally and coated with acetone, benzene, and n-propyl acetate on the surface, blown on the surface by an air pump; and then is heated by a thyristor rectifier infrared heating device, coated with the polyester epoxy powder coating on the surface and heated by the thyristor rectifier infrared heating device again; and are roll coated with epoxy resin powder, butyl acetate, and industry paint color masterbatch to be made of lathework, heated, coated with varnish on the surface, and is heated again to get finished product of the aluminium alloy decorated board with the lathework. The invention has the advantages that the invention is acid resistant, alkali resistant, chemical corrosion resistant, and is not easy to paste with the chimney soot, and is of high inoxidability. The invention has no phenomenon of peeling and dulling, the varnish has no abscission. The pattern is of strong third dimension, soft and bright color, no discoloration and fastness. The manufacturing cost is lower.

The present invention provides a reconstruction configuration method of thyristor controlled reactor (TCR) valve block which is simultaneously used as a twelve pulsations rectifying valve block. The thyristor controlled reactor (TCR) valve block which is simultaneously used as a twelve pulsations rectifying valve block is composed of twelve groups of valve blocks. Each group of valve blocks has a series structure of thyristor. Thyristors with different numbers are connected in series for adapting different voltage grades. Different topological structures are formed through resolution, combination and reconstruction. The thyristor controlled reactor valve block and the thyristor rectifier can be respectively formed for flexibly used for the static var compensation SVC and rectifying. According to the method of the invention, the thyristor controlled reactor (TCR) valve block which is simultaneously used as a thyristor rectifying valve block is resolved and recombined for forming different topological structures. Simultaneously the SVC is formed for var compensation, system pressure regulation and stability control. A rectifying system is formed in disaster weather for DC ice melting. The method of the invention has evident economical efficiency.

The invention provides an AC-side brake device and brake method of an AC-DC-AC traction transmission system. The AC-side brake device of the AC-DC-AC traction transmission system comprises a thyristorphase control rectifier, an inductor, a resistor, a DC voltage detection unit, a motor current detection unit and a controller. The method comprises the steps of connecting the thyristor phase control rectifier to a three-phase output end of an inversion module, and connecting the inductor and the resistor which are connected in series to an output end of the thyristor phase control rectifier; and sending a DC-side voltage and a motor current which are obtained by sampling to the controller, respectively outputting a pulse signal and a phase control angle signal to the inversion module and the thyristor phase control rectifier by the controller through a control algorithm, and controlling a three-phase AC motor to run by the inversion module. By the device and the method, a four-quadrantrectifier is not needed, breaking can be achieved at an AC side, and the AC motor is in a controllable brake state; and when the device is applied to a cascaded H-bridge traction transmission system,a brake unit is unnecessary to be additionally arranged at each H-bridge power unit, only the brake unit comprising the thyristor phase control rectifier, the inductor and the resistor is needed to beadditionally arranged at an input end of the motor, and energy consumption braking is simple and practical.

The invention discloses a control method and system for preventing out-of-control of an oil drilling engineering drilling rig/traveling block. An automatic control template with the pressure capable of being adjusted is inserted between a drilling rig/traveling block control driller switch and a thyristor rectifier, a low-voltage alternating current signal output by the driller switch is collectedin real time, and transmitted to a processing unit after rectifying and reducing the voltage, the processing unit detects and analyzes in real time and controls a thyristor voltage regulating unit tomodulate and output an alternating current voltage signal of 0-20 V to the thyristor rectifier according to an instruction of a PLC; the changes of the height and the speed of thedrilling rig/traveling block are captured in real time by using a winch sensor/hook position sensor, height and speed values of the traveling block are detected and analyzed in real time by using the PLC, and transmittedto the processing unit. The downward speed of the traveling block is monitored by using the winch sensor, a given voltage signal output by the driller switch is used for judging whether the travelingblock is within the controllable range or not, then through the automatic control template and an electromagnetic eddy current brake system, the drilling rig/traveling block is prevented from losingcontrol due to improper operation or accident, and the economical effect, safety and reliability are achieved.

The invention discloses a redundant switching control system of a thyristor rectifying device under compensation operation in an aluminum electrolytic cell. The system comprises 1#-3# thyristor rectifying units and a control system, wherein the control system comprises a master dispatch PLC and PLCs of various units; the 1#-3# thyristor rectifying units are connected to a 2# positive bus and a negative bus in parallel; one side of the 1#-3# thyristor rectifying units is provided with a 4# thyristor rectifying unit; the outputs of the 4# thyristor rectifying unit are connected with a 1# positive bus, the 2# positive bus and the negative bus correspondingly; 5#-8# thyristor rectifying units are connected with the 1# positive bus and the negative bus in parallel; the outputs of the 5# thyristor rectifying unit are connected with the 1# positive bus, the 2# positive bus and the negative bus correspondingly; the 4# thyristor rectifying unit and the 5# thyristor rectifier unit are connectedwith a current and voltage detection circuit; and two sets of parallel power supply flow stabilization systems of a four rectification units combined mode carry out large-closed-loop control separately.

The invention discloses a comprehensive failure diagnostic system for a triphase controllable thyristor rectifier. The comprehensive failure diagnostic system consists of a rectified voltage sampling circuit, an alternating current input voltage sampling circuit, a synchronizing signal capturing circuit, a protection signal detecting circuit, a failure display alarming circuit, a host computer communicating circuit and the like. By the specific failure diagnostic method, through the use of the comprehensive failure diagnostic system for the triphase controllable thyristor rectifier, the failure of a power tube is positioned, and the maintenance time is greatly shortened. The failure diagnostic system of the rectifier mainly comprises the rectified voltage sampling circuit, the alternating current input voltage sampling circuit, the synchronizing signal capturing circuit, the protection signal detecting circuit, the failure display alarming circuit, the host computer communicating circuit and the like. The failure diagnostic system of the rectifier adopts a failure diagnostic method supporting a vector machine and has higher diagnosis accuracy and good applicability for a diode and different kinds of loads. The software adopts modularization programming and C language programming, and compared with assembly language, the comprehensive failure diagnostic system has the advantages of high readability, high transportability and the like.

The invention relates to a variable topology thyristor rectifier, which comprises two thyristor bridge rectifiers T1 and T2. The input ends of the T1 and T2 are connected with a single-phase or three-phase isolation alternating current voltage source respectively, and the voltage sources have an electrical angle difference. The negative pole of the output end of the T1 is connected with the positive pole of the output end of the T2 through a switch S1, and the positive pole of the output end of the T1 and the negative pole of the output end of the T2 are connected with an LC filter consisting of an inductor L and a capacitor C. The two ends of the capacitor C are connected with an inverter of which the output end is connected with a power grid. The T1 and the T2 run in different modes according to different electrical angles, the sinusoidal voltages of the two different electrical angles are superposed to form sinusoidal input voltage grades of different amplitudes, and input voltages are selected according to different load conditions to realize minimum voltage input under an on-load running condition; a trigger angle of a thyristor is as small as possible, so that a high-power factor running condition is created; and current peak prediction control is adopted for a plurality of running modes to realize the dynamic switching of an online mode.

The invention discloses an electrolytic hydrogen production rectification power supply based on a two-stage auxiliary converter and a power supply control method. The electrolytic hydrogen production rectification power supply comprises a voltage source type PWM converter, a phase-shifted full-bridge converter, a multi-pulse thyristor converter, a three-phase LC filter, direct-current smoothing reactors L1 and L2, a decoupling capacitor Cs and a control device. And the multi-pulse thyristor converter is connected in parallel with a two-stage AC-DC converter. The multi-pulse thyristor converter is a main power rectifier and provides main power for a load, and the two-stage AC-DC converter is an auxiliary power rectifier and is used for compensating output ripples and input harmonics generated by thyristor rectifiers. After compensation, the ripple content of the direct current output total current of the hydrogen production rectification power supply is greatly reduced, the hydrogen production efficiency can be effectively improved, alternating current input harmonic waves are effectively suppressed, the electric energy quality can be improved, and high-power, low-cost and high-efficiency hydrogen production is realized.

The invention discloses a multiphase current type PWM rectifier based on the dual controllable rectifier bridge of a hybrid switch, which is composed of five modules, wherein the module 1 is composed of an LC filter, the modules 2 and 4 are respectively a thyristor rectifier bridge, the module 3 can be two reverse-conducting full-control electronic switches which are independently controlled, and the module 5 is an LC filter with a freewheel diode. The rectifier with the structure is mainly characterized in that two groups of thyristor rectifier bridges are adopted so as to provide enough time for the thyristor to conduct and restore to the forward blocking state; and requirements on thyristor cut-off speed by the rectifier bridge can be lowered. Thus, the invention can lower limitation on the working frequency of the rectifier circuit by the cut-off time of the thyristor of a bridge arm in the rectifier bridge, inhibits network side harmonic wave, and reduces the cost of the switching element of the rectifier without increasing the cost of filtering elements.

An electro-static discharge protection circuit comprises a thyristor mode ensuring circuit and a thyristor rectifier circuit. The thyristor mode ensuring circuit includes a capacitive element C1 connected between a higher potential line Vdd and a lower potential line Vss, and ensures a constant and sufficient capacity independently of the number of input/output signal bits, even when the number of input/output signal bits is the theoretical minimum, i.e. 1, so that a surge current induced by electro-static discharge (ESD) applied to an output pad Vout is injected into the first capacitive element C1 in order to charge it. Thus, by means of the current caused by the surge current, the thyristor rectifier circuit is triggered into a thyristor mode, which allows the surge current to flow to the lower potential line Vss through the thyristor rectifier circuit, resulting in a CMOS inverter of an internal circuitry being effectively protected against the surge current. A semiconductor device which includes the electro-static discharge protection circuit is also provided.