96results about How to "Simple control method" patented technology

The invention discloses an on-line coordination control method for the plate shape and plate thickness of a strip tandem hot continuous rolling mill, belonging to the technical filed of hot continuous rolling of sheets and strips. The method is characterized by comprising the following steps: (1) collecting n rack hot continuous rolling mill equipment and rolling schedule parameters; (2) collecting the roll force and the convexity offset value of a last rack plate in situ; (3) calculating the plate shape stiffness of each rack; (4) keeping the thickness of the outlet of the tail rack to be constant; (5) inversely calculating the convexity variable quantity of the mechanical plate of the i rack from the tail rack; (6) calculating the roll force and the variable quality of the thickness of the inlet of the i rack; (7) calculating the thickness of the new inlet and outlet of the i rack; (8) calculating the rolling reduction and adjusted quantity of the i rack; (9) calculating the convexity variable quantity of the outlet plate of the (i-1) rack according to the equi-proportional convexity condition; (10) repeating steps from (5) to (9) to obtain the rolling reduction and adjusted quantities of 2nd to n racks; (11) calculating the rolling reduction and adjusted quantity of the first rack; and (12) carrying out on-line coordination control according to the rolling reduction and adjusted quantities, thereby achieving the purpose of coordination control on the plate shape and plate thickness.

The invention discloses a sine wave inverter parallel system with variable current ratio, which is characterized by comprising a monitoring management unit and one or a plurality of inverter power supply modules in redundancy parallel operation; the monitoring management unit is connected with all the inverter power supply modules through a communication signal wire; the inverter power supply modules are mutually connected by the communication signal wires, synchronous signal wires and average current signal wires; and each inverter power supply module is simultaneously connected with a DC (Direct Current) input end and an AC (Alternating Current) output end. The proportion of the load current shared by each module of the parallel system provided by the invention can be set as required so as to meet the requirements on uniform load current sharing (current equalization) by parallel inverter power supply modules with same capacity or load current sharing by the inverter power supply modules with different capacities in the parallel system according to different proportions, so that the parallel function of the inverter power supply modules with different capacities is realized.

A method for controlling service access of Bluetooth mobile phone being switched in to Bluetooth gateway includes configuring access parameter of said mobile phone to said gateway and setting up ACL connection, issuing access request to said gateway by said mobile phone and sending right certification request to said mobile phone by said gateway, calculating out right certification result being matched with right certification parameter, switching on correlation service access right under access mode requested by said mobile phone if said match is successful or otherwise refusing correlation service access right under access mode requested by said mobile phone and disconnecting ACL connection of mobile phone.

The invention discloses a delayless control method of rotor current of a grid-connection, speed-change and constant-frequency double-fed induction wind driven generator (DFIG). The conversion of a rotational coordinate is carried out by collecting three-phase rotor current signals, the feedback quantity of rotor current in a corotation synchronous-speed rotating coordinate system is obtained and is compared with a rotor current command in the same coordinate system, an error signal is inputted into a proportional-integral-complex coefficient resonance regulator for regulation, and the rotor reference voltage in the corotation synchronous-speed rotating coordinate system is obtained after feedback compensation decoupling and then converted into the rotor reference voltage used for space vector pulse width modulation (SVPWM) in the rotor coordinate system to generate a switching signal of a power device of a rotor side convertor so that DFIG grid-connected operation can be controlled. The method does not need to carry out positive and negative sequence decomposition of rotor current under balanced or unbalanced grid voltage, can not introduce decomposition time delay and can realize the reinforced control target of a power generation system under the unbalanced grid voltage, thereby effectively increasing the ride-through (uninterrupted) operation capability of a wind power system under power grid failure.

The invention relates to a control method and a control system for the air-conditioning fresh air of a rail vehicle. A vehicle body is provided with a weight detection mechanism for detecting the weight of the vehicle; the weight detection mechanism transmits a detection signal to a central control unit; the central control unit processes the detection signal received from the weight detection mechanism, converts the detection signal into a corresponding weight signal, and transmits the weight signal to an air-conditioning control system; and the air-conditioning control system converts the weight signal into the number of passengers according to the weight of the vehicle to control the opening of a fresh air regulating valve. The number of the passengers is determined according to the weight of the vehicle, and the opening of the fresh air regulating valve in an air-conditioning system is controlled by gears, so that the aim of controlling fresh air amount is fulfilled, energy is saved, consumption is reduced, and the control method is simple, safe and reliable, and easy to operate.

The invention discloses a nondelay control method for the current of the rotor of the variable speed constant frequency double feed nonsynchronous aerogenerator(DFIG). The transformation of coordinates of static three phase/two phase of the rotational coordinate is finished by collecting three phase rotor current signal so as to obtain the rotor current feedback amount in the static frame of axes to compare with the rotor current command in the stator static frame of axes, the difference signal is input into the proportion-resonance regulator for comparison, the rotor voltage reference value in the stator static fame of axes is obtained after feedback compensation decoupling. The rotor voltage reference value is then transformed into reference signals for space vector pulse width regulation in the rotor frame axes to generate switch signals of the power components of the converter of the rotor to control the synchronize and close operation of the generator. The invention is needless of the break down of the positive and negative sequence of current of the EFIG rotor no matter the electric net voltage is balance or not without introducing break down delay. The invention can realize strengthened control of the generating system in imbalanced electric net, effectively improve non-stop operation of the aerogenerator.

The invention discloses a control and deformation compensation method for intelligent arm supports of a concrete pump truck. The method includes the specific steps: (1) giving an operation amount through a wireless remote controller transmitter by an operator and receiving the operation amount by a remote controller to obtain coordinate variations delta x, delta y and delta z of endpoints of the arm supports; (2) converting coordinates by an intelligent operation algorithm to obtain target angles beta of the arm supports and towers; (3) mounting ground absolute tilt angle sensors a1-a8 at arm heads and arm tails of intelligent arms of the concrete pump truck respectively and measuring tilt angles of the towers by a ground absolute tilt angle sensor a0; and (4) setting measured values of the ground absolute tilt angle sensors as ai, and calculating controlled quantities of the arm supports of the concrete pump truck and equivalent relative included angles of the arm supports according to the measured values ai of the ground absolute tilt angle sensors, wherein the equivalent relative included angles include the relative included angle beta i between each two adjacent arm supports and arm support deformation compensation angles delta i. The method has the advantage that intelligence of the pump truck and track control precision of tail ends of the arm supports can be improved.

The invention discloses a direct torque control method for a harmonic voltage injected multi-phase induction motor. In a multi-phase motor system, non-sinusoidal voltage and current are supplied, so that the air gap magnetic density waveform is quasi-square wave, the magnetic potential and the magnetic density peak of fundamental wave can be reduced, and the utilization rate of an iron core material and the power density of a motor are improved. When the multi-phase motor is driven by a voltage type frequency converter, the circuit impedance of fundamental wave and harmonic spaces is changed together with the change of a load, and the control requirement that the air gap magnetic density is square wave cannot be met by adopting fundamental wave and harmonic voltage constant proportion control. Therefore, in a direct torque control system of the multi-phase motor driven by the voltage type frequency converter, effective control of fundamental wave and harmonic voltage amplitudes and phases must be realized. A variable frequency speed control system of a five-phase centralized integral pitch winding induction motor is taken as an example in the method (which is also suitable for a random multi-phase induction motor system), a control scheme of combining spatial voltage vector modulation and direct torque control is adopted, and fundamental wave and third harmonic reference voltages are calculated by controlling torques respectively formed by the fundamental wave and the third harmonic and controlling stator flux. The control method realizes closed loop control of the fundamental wave and harmonic voltages, ensures a constant phase relationship between the fundamental wave and the third harmonic flux, and achieves the control requirement that the air gap magnetic density waveform is the quasi-square wave. Due to effective control on harmonics, the output torque of the motor is increased, and the robustness and the dynamic steady state performance are also improved.

An optical wavelength converter includes a distributed Bragg reflector laser having an active area, a phase area, and a distributed Bragg reflector area in which a distributed Bragg reflector is formed; an optical wavelength conversion device for receiving fundamental wave light emitted from said distributed Bragg reflector laser and outputting second harmonic wave light of the fundamental wave light; and a control circuit for controlling an emission wavelength and a light output by controlling an injection current to be injected into the distributed Bragg reflector laser for each period. The control circuit controls the injection current to be injected into the distributed Bragg reflector laser while satisfying a condition for controlling a light output mode of the distributed Bragg reflector laser so that light energy to be inputted into the optical wavelength conversion device in each period is constant and satisfying a condition for injecting a current into each of an active area, a phase area, and a distributed Bragg reflector area in each of periods in a mode of constant amount of generated heat so that an injection current-emission wavelength characteristic in the distributed Bragg reflector area is constant.

An electric motor such as a driving source of an electric vehicle is controlled by the microcomputer 7. The microcomputer 7 calculates a target torque Req_trq according to a throttle opening degree α, and outputting induction values (a current instruction value I and a angle instruction value θ) obtained referring to a map MP based on the target torque Req_trq (a motor rotational number Nm and a battery voltage Vb), the microcomputer 7 performs a torque control of an SR motor 3. The motor rotational number Nm detected from the SR motor 3 is passed through a band pass filter 51. Passing by the band pass filter 51, a signal data of the extracted 0.1-50 Hz is executed a PD calculation process 52, the calculated corrected amount PD_out is subtracted from the target torque Req_trq.

The invention discloses a precise intelligent winding machine and a winding control method thereof. The precise intelligent winding machine mainly comprises a support, a guide rail, a pressing arm component, a roller set, a belt feeding servo motor, a winding shaft and pneumatic equipment thereof, a central controller, a winding shaft belt pulley and a motor thereof, and the like. Wound fabric is wound on all rollers in the roller set sequentially through a feeding support, passes a guide roller on the pressing arm component, and then is wound on the winding shaft through a guide head. The pressing arm component is mounted on the guide rail and driven through a synchronous belt. The central controller controls rotational motion of a synchronizing wheel driving motor so as to control position and stepping speed of the pressing arm component, and controls rotational speeds of the belt feeding servo motor and the winding shaft so as to adjust and control tensile stress for winding the fabric. Density, the tensile stress and winding shape for fabric winding can be precisely controlled, the control method is simple and feasible, and a powerful guarantee is provided for smooth proceeding of subsequent dyeing.

The invention discloses an algorithm of walking along an edge of a dust collection robot. The dust collection robot comprises a frame, wherein two driving wheels, two driving wheel motors connected with the driving wheels, and a supporting wheel are arranged on the frame. The dust collection robot further comprises a fore sight obstacle detection sensor installed in the front of the dust collection robot, a side sight obstacle detection sensor installed on the left side, a step detection sensor installed at the bottom of the frame, a rechargeable battery which provides a power source, a dust collection motor which is used for carrying out vacuum dust collection, and a processor which is used for carrying out centralized control. The driving wheel motors, the dust collection motor, the fore sight obstacle detection sensor, the side sight obstacle detection sensor and the step detection sensor are connected with the processor. The processor has the algorithm of walking along the edge, and the algorithm of walking along the edge is used for designing different strategies according to different positions of walls or obstacles, and guiding the dust collection robot to walk along the walls or the obstacles.

The invention relates to a rotor spinning machine full automatic joint control method comprising seven steps: setting parameters, obtaining spindle number information, positioning walking, extending and retracting a manipulator, controlling the rotor speed, controlling the joint and resetting the manipulator in turn. The device realizing the control comprises a human-computer interface, a servo joint device, a rotor speed control device, a walking-positioning device and a manipulator control device which are respectively connected with a DSP controller by the transmission medium. The human-computer interface device is also connected with the servo joint device. The transmission medium comprises an RS485 module, a CAN module, an IO-signal and a high-speed I/O signal. The control method of the invention is simple; can realize the full automatic control of yarn joint operation, and overcome the deficiencies of low control precision, poor quality of joints and low efficiency of the existing semi-automatic joint spinning machine; and compensates shortcomings of larger power consumption, and low anti-interference and stability of the existing full automatic joint control system.

The invention discloses a modularized variable-rigidity joint mechanism of an S-shaped robot and belongs to the field of robot research and engineering. When universal wheels rotate around the central axis of a module, the S-shaped robot can achieve wheel type motion; when parallel linear drivers in the joint telescope, small passive wheels in the universal wheels contact with the ground to generate anisotropy friction force to achieve S-shaped motion, and lateral covers arranged on two sides of the wheels can have a certain protection effect on the wheels. The damping force control of a magneto-rheological damping link is separated from branch chain motion control, current magnitude in the coil of a piston head can be controlled according to needs to change the magnetic field intensity in a magneto-rheological sleeve so as to change the state of magneto-rheological liquid, and accordingly damping force can be controlled, and variable rigidity is achieved. The link does not affect the various motion gaits of the S-shaped robot, the joint self-locking and self-protection ability of the S-shaped robot can be increased, and the environment adaptability of the S-shaped robot is increased greatly.

The invention specifically relates to a dynamic seat control method and control system for household entertainment. The method comprises the following steps: when a user is detected on a dynamic seat, a dynamic seat starting instruction and a dynamic game or dynamic movie and television starting instruction are orderly obtained, movement data corresponding to game plots and movie and television plots are obtained at an interval of preset time, the movement data is parsed, and a movement control instruction is generated for controlling the dynamic seat to realize movements corresponding to the game plots or the movie and television plots. Via the dynamic seat control method disclosed in the invention, the movement data corresponding to a game plot or a movie and television plot can be obtained after the user is detected on the dynamic seat, and the dynamic seat is controlled to realize movement changes corresponding to the game plot or the movie and television plot. The method and system are simple and low in cost, the system can be quickly built via direct use of household equipment such as a computer, sound equipment and the like; the method and system are suitable for household application.

The invention discloses an automobile heat radiation system matched with a hydraulic retarder and a control method of the automobile heat radiation system. The automobile heat radiation system comprises a cooling loop system, an electronic water pump, a water temperature sensor and a control module. The cooling loop system comprises a heat radiation water tank, an original automobile water pump, an engine water inlet pipe and an engine water outlet pipe. A water outlet of the original automobile water pump is communicated with the engine water outlet pipe, the engine water outlet pipe is communicated with a water inlet of a retarder, a water outlet of the retarder is communicated with a water inlet of a thermostat, a water outlet of the thermostat is divided into two communicated with a water inlet of the heat radiation tank and a water inlet of the original automobile water pump respectively, a water outlet of the heat radiation water tank is communicated with the engine water inlet pipe, and the engine water inlet pipe is communicated with the water inlet of the original automobile water pump; the electronic water pump is arranged in parallel to the original automobile water pump, and the control module controls opening and closing of the electronic water pump. The automobile heat radiation system is simple in structure and capable of meeting requirements of heat radiation of the automobile cooling system and is oil saving.

The invention discloses a control method for a printing system, and the method comprises the steps: (1) starting printing, reading information of consumable materials, and obtaining the information of printing mediums, wherein different printing mediums are corresponding different standard printing parameters; (2) detecting the current voltage parameter and/or environmental temperature parameter of a printing head, comparing the parameter with a standard printing parameter, and correcting the printing parameter and a printing mode; (3) starting printing and outputting. Through the real-time monitoring of the voltage and environmental temperature parameters of the printing heads of a printer and the comparison of the voltage and environmental temperature parameters with the standard printing parameter, the printing parameter and mode are corrected, thereby guaranteeing the continuous normal output of the printer in long-time continuous printing. Moreover, the former and later printing effects of the continuous printing are consistent.

The present invention discloses a non-symmetrical PWM control type ISOP full-bridge direct-current converter and a control method thereof. The input side of each module of a converter comprises an input capacitor, an inverter bridge and a transformer primary side. The output side of each module of the converter comprises a transformer secondary side, a full-bridge rectifier circuit and an LC filter circuit. The positive electrode of an input direct-current power supply is in series connection with an input inductor and then is connected to the first bridge arm middle point of the inverter bridge of the input side of the first module. The negative electrode of the input direct-current power supply is connected with the negative end of the input capacitor of the last module. The connection mode of two adjacent modules is as follows: the negative end of the input capacitor of a former module is connected with the first bridge arm middle point of the inverter bridge of a latter module. Based on the above structure, the capacitive short circuit problem of the input power supply during the short-circuited stage can be effectively avoided. The converter is modulated in the non-symmetrical PWM manner, so that the voltage of the input capacitor is reduced. The capacitance value and the size of the input capacitor are reduced. The modules are driven in the staggered manner, so that the input and output current/voltage ripples are effectively reduced, and the requirements of a filter are lowered.

The invention discloses a method for controlling an electronic expansion valve in an air conditioner system. The method includes the steps that firstly, the electronic expansion valve is started and initialized, the air sucking temperature of a compressor and the valve back temperature of the electronic expansion valve are detected in real time, and the practical superheat degree of the electronic expansion valve is calculated according to the difference of the air sucking temperature of the compressor and the valve back temperature of the electronic expansion valve; the target overheat degree of the electronic expansion valve is set according to the inlet water temperature value of an evaporator and the changing trend of the temperature; the practical overheat degree is compared with the target overheat degree, and the optimal opening degree range of the electronic expansion valve is determined through a closed-loop control system. The method has the advantages that by means of the scheme, the practical overheat degree can be calculated by the system, the practical overheat degree is compared with the set target overheat degree, and the optimal opening degree range is determined. The control method is simplified, the equipment cost is reduced, automatic control over the refrigerant flow and the throttling degree can be achieved, and reliable and safe operation of the equipment system is protected.

The invention discloses a Buck terminal coupled inductor buck-boost conversion circuit and belongs to the DC non-isolated conversion technology, and the stable output voltage can be achieved in a wideinput voltage range. According to the invention, a coupled inductor, three power switch tubes and three freewheeling diodes are mainly used to achieve a buck-boost function, and the stable output voltage is ensured. In the present invention, the current in a Buck terminal coupled inductor operates in a discontinuous mode, the zero-current turn-on of two power switch tubes of a Buck terminal and the zero-current turn-off of two freewheeling diodes of the Buck terminal can be achieved, the problem of the reverse recovery of two diodes at the Buck terminal is eliminated, therefore, the soft switching function is realized, and the efficiency of the conversion circuit is improved. The current sharing control is not required, and even if the duty ratios of the two power switch tubes of the Buckterminal are slightly different, the uniform current of two inductor currents in the coupled inductor can be realized. The invention is suitable for applications such as wide input electric vehicles,fuel cells, photovoltaic power generation, wind power generation and other new energy supply systems.

The invention belongs to the technical field of combustion engines, and relates to a cavity resonance-based control method for reducing combustion noises of the combustion engines. The control method comprises the following steps: performing an phonics response experiment to a combustion chamber of a selected combustion engine to determine a combustion chamber cavity resonance frequency range corresponding to different crank shaft rotor angles of the combustion engine, inputting the frequency range to a ECU (Electronic Control Unit) of the combustion engine for use during the operating process of the combustion engine in an MAP (map analyzer program) manner; during the operating process of the combustion engine, performing on-line high frequency filtering on the high frequency pressure oscillation data in a time window according to the measured air cylinder pressure signals, and using a wavelet analyzing method to acquire the combustion chamber cavity resonance frequency corresponding to different crank shaft rotor angles; and further, comparing combustion chamber cavity resonance frequencies corresponding to different crank shaft rotor angles with the combustion chamber cavity resonance MAP corresponding to different crank shaft rotor angles in the ECU, and taking corresponding measures to reduce the cylinder high frequency pressure oscillation of a ring. The cavity resonance-based control method for reducing the combustion noises of the combustion engines can effectively reduce the combustion noises of the combustion engines, especially small combustion engines.

The present invention belongs to the technical field of non-volatile semiconductor memories, and relates to a semiconductor memory structure and a control method thereof. The semiconductor memory structure in the present invention comprises a memory unit for storing information and a tunneling field-effect transistor connected with the memory unit. The tunneling field-effect transistor is used for controlling the semiconductor memory's operations such as erasing, writing, and reading. A plurality of semiconductor memory structures compose a semiconductor memory array. The control method provided by the present invention comprises steps of resetting, setting, and reading. A vertical gate-controlled diode structure in a tunneling field-effect transistor is capable of providing a large current for writing a resistive random access memory and a phase change memory and improving the density of the memory array and therefore is very suitable for use in manufacturing of semiconductor memory chips; besides, the control method and the control circuit thereof are simple.

The invention discloses a method for improving expansion performance of vermiculite. The method comprises the following steps: hydrothermally modifying raw ore vermiculite and water or a salt solutionwhile heating and magnetically stirring at high temperature and high pressure, and then expanding a hydrothermally modified material to obtain expanded vermiculite. By the method, through the high temperature and the high pressure, water molecules and ions between vermiculite layers are regulated and controlled so as to achieve the purpose of regulating and controlling the expansion rate or the peeling degree of the vermiculite; the method has the advantages of a simple and effective regulating and controlling method, a high expansion ratio, easiness in separation, simple equipment, improvedproduction efficiency, less pollutants, an obvious economic value and the like.

The invention discloses a web development front-end and rear-end separation authority control method and system, and relates to the technical field of web system authority control. The method comprises the steps of creating a role; initializing a service packet and interface data corresponding to the service packet; initializing functions and function interface data corresponding to the functions;initializing a menu and menu functions; initializing a role menu; initializing a role menu function; initializing an interface capable of being called by a role; carrying out role permission controljudgment; when a user calls an interface, the back end acquiring the role of the user; querying an interface list which can be called by the role of the user, and judging whether calling can be carried out or not according to the interface list which can be called by the role of the user. By decoupling the interface service logic and the permission control part, the rear-end interface only needs to realize the service logic, and when the interface needs to be increased or decreased, only the corresponding relationship between the function and the interface needs to be modified, so that the control method of the interface calling permission can be simplified, and the permission control complexity is reduced.

The invention discloses a direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device and a control method thereof. The invention mainly comprises a subsynchronous oscillation suppression device and an improved virtual synchronous machine control method thereof, which are used for suppressing subsynchronous oscillation of a direct-driven wind power plant under a condition of grid connection of an inductive weak power grid. The subsynchronous oscillation suppression device comprises a static synchronous reactive power compensator and a battery energy storage system. A storage battery is connected to a direct current side of a static synchronous reactive power compensator, and the control method is improved virtual synchronous machinecontrol. By using the direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device and the control method thereof, subsynchronous oscillationcaused by interaction between a direct-driven wind power plant and an inductive weak power grid can be well suppressed, and a solution is provided for treatment of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation.

The invention relates to a method for controlling a clutch, in particular to a method for controlling synchronous impact of the clutch. The method uses the control strategy to reduce the friction torque before synchronizing through reducing the joint pressure at the slipping friction stage of the clutch so as to reduce the synchronous impact. The joint position of the clutch is determined according to the rotary speed of the slipping friction and the change of the change rate of the rotary speed of the slipping friction, namely, the execution mechanism of the clutch moves forwards at the beginning of the jointing stage of the clutch, so that the joint position can be quickly reduced, the friction torque can be quickly enlarged, and the slipping friction time and the slipping friction work at the stage can be reduced as far as possible; and the execution mechanism of the clutch is controlled to move oppositely when synchronization is about to be achieved, namely, the rotary speed of the slipping friction reaches a certain value, so that the joint position can be enlarged, and the friction torque before synchronization can be reduced so as to reduce the synchronous impact of the clutch in the jointing process. According to the control method provided by the invention, the impact at the synchronizing time is effectively reduced, and the slipping friction is not remarkably increased in the joint process. The control method is simple and has strong instantaneity.

The invention provides an exoskeleton mechanical-leg rehabilitation system standing mode control method. After a standing mode is started, array-type electromyographic signals are firstly decomposed, then characteristic parameters (motion unit number, issuing frequency and issuing waveform energy) of muscular movement units are extracted and are quantified, and finally a staged driving joint motor outputs a torque according to the quantified characteristic parameters to assist a patient for leg muscle rehabilitation training. Due to the fact that the method is based on the characteristic parameters of the muscular movement units, a muscle state can be also reflected, and the method is very conductive to patient rehabilitation and has the advantage of being simple to achieve.

The device includes following units: counting unit for global clock (CUGC) in use for indicating serial number of the input data in fast source clock domain; being connected to CUGC, multichannel allocation and control unit (MACU) in use for sampling the input data circularly based on serial number of data; being connected to MACU, the synchronous control unit (SCU) in use for synchronizing the sampled data with target clock domain; being connected to SCU, the word assembling unit in use for assembling the synchronized data by SCU into the assembled data. The method includes steps: indicating serial number of the input data in fast source clock domain; based on serial number of the data to sample the input data circularly through multiple data channels; synchronizing the sampled data with target clock domain; assembling the synchronized data into the assembled data and outputting the data. Features are: raising transmission efficiency, and simple control method.

A digital three-phase shifting triggering IC contains three comparator circuits, a debouncing circuit, three phase shifting circuits, three pulse width generating circuits, three output driving circuits and a open-phase protection circuit. Said invention adopts digital control method to control accuracy shift triggering of thyristor and raises phase shifting precision and symmetry degree, circuit stability and reliability, and reduces products complexity and separation degree.

The invention discloses a machining technology for annular steel belts. According to the machining technology for the annular steel belts, a spinning method is utilized for machining the annular steel belts, a method for matching the outer diameter of a machine core rod with the inner diameter of a steel tube is adopted for determining the perimeter of the steel tube, and the control method is simple. Compared with a traditional method, the perimeter can be accurately controlled, and the product yield can be improved; after spinning of one tube is successful, different steel belts can be obtained through cutting according to the requirements for different widths, and production efficiency of the annular steel belt is conveniently improved.