127 results about "Line regulation" patented technology

A power factor controller or corrector is provided in a regulated power supply circuit, in which the load and line regulation circuitry is separate from one another and in which the line regulation is provided with a 1 / x2 modulator in which the switching frequency is inversely proportional to the square of the line voltage.

A three phase buck power converter having input power control is described. The power converter uses a three input buck converter comprising switches for each phase, a catch rectifier, an inductor and an output capacitor. The duty cycle of the three switches is constrained to have a sine function relationship that may be derived from the input voltage wave form or from a reference oscillator. When so constrained, the input currents have high power factor. The output is a precise, high quality dc voltage, comparable to the output of a dc—dc buck converter, and the dynamic response is comparable. Voltage mode and current mode controls are shown, as is a precise line regulation feed forward for the voltage mode embodiment. The three phase buck power converter may be operated in reverse as a three phase boost converter, as they are reciprocal. A three phase ac—ac converter may have a three phase buck converter as its input and a three phase boost converter as its output.

Systems and methods disclosed herein monitor and control input to a converter in one or more of a UPS, a frequency converter, or a line conditioner. Distortion due at least in part to ripple voltage can be removed from a control signal that controls input current to the converter. The systems and methods described herein afford a simple and effective way to reduce or eliminate one or more of subharmonic oscillation and total harmonic distortion from a converter input current during synchronous and asynchronous modes of operation. The converter may include one or more of a rectifier and an inverter.

Methods and apparatus for regulating a synchronous rectifier DC-to-DC converter by adjusting one or more existing synchronous rectifiers in the converter are provided. By regulating an existing synchronous rectifier, the rectifier may function as a modulator for post regulation over a limited range of output voltages suitable for load regulation, without introducing an additional conversion stage for post regulation, which typically decreases efficiency and power density. Independent post regulation of an existing synchronous rectifier may improve the load regulation, reduce output voltage ripple, and improve the transient response of the converter. By operating independently from the main control loop, post regulation may most likely avoid the limitations of the main control loop, such as limited gain bandwidth and a relatively slow transient response. Such post regulation may be added to isolated or non-isolated switched-mode power supplies, such as forward or buck converters.

A circuit and corresponding method for reducing standby power and improving no-load to full-load regulation for ringing choke converters by maintaining a reduced duty cycle, with longer off time at no-load, while maintaining the output voltage swing closer to the full-load level. This reduced duty cycle prevents the output voltage from swinging high with respect to the full-load level, thereby providing good no-load and full-load output regulation in open feedback loop systems. The circuit and method provides very low no-load switching frequency and duty cycle by increasing the off time of the main switch through use of a turn off transistor driven by a zener diode, thereby maintaining conduction even with a very small control current and prolonging the off time of the main switch. The circuit and method achieves the benefits preferably using only less costly basic discrete converter components instead of more costly integrated circuits.

The invention discloses a cold-rolled strip steel plate shape control system and method. An advanced feedforward-feedback cooperative control architecture is adopted and after a plate shape automatic control system is put into on-line operation, plate shape variation and outlet plate shape real-time deflection caused by changes of convexity and rolling force are jointly calculated out by calculating links of the plate shape variation and the outlet plate shape real-time deflection which are caused by the changes of the convexity and the rolling force; and then an on-line regulation variable for control of a cold-rolled strip steel plate shape is calculated out at an optimal regulation variable calculating and amplitude limit processing link of a plate shape control mechanism. The time-delay influence of strip steel in transmission between a rolling mill and a plate shape gauge is eliminated and the precision for estimating the plate shape is ensured; and the technical problem of outlet plate shape quality variation caused by practical factors such as the convexity change and the rolling force fluctuation of supplied materials during the rolling process can be solved, so that the quality of cold-rolled strip steel products is enhanced remarkably.

A method and apparatus for power conversion in a class D amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors.

A light transmission module of tunable positive-governing type consists of tunable positive-governing laser, positive-governing control circuit, automatic light power control circuit, automatic temperature control circuit, laser switch control and performance detection circuit. It is featured as enabling to realize parameter calibration, on-line regulation and performance parameter diagnosis of digitalization module by leading in micro control unit and nonvolatile digital potentiometer.

The invention discloses a self-regulating error symbol integration robust control method for a direct-drive motor system. The method comprises the steps of establishing a mathematical model of the direct-drive motor system; designing a self-regulating error symbol integration robust controller; carrying out stability certification on the direct-drive motor system by using the Lyapunov stability theory, and acquiring a result of the global asymptotic stability of the system by using the Barbalat lemma. The self-regulating error symbol integration robust control method integrates the idea of self-adaptive control based on a traditional error symbol integration robust control method, and designs a controller gain self-regulating law so as to carry out on-line regulation on an integration robust gain value of the RISE controller. The self-regulating error symbol integration robust control method effectively solves problems of randomness, conservation, limitation and potential high-gain feedback in symbolic function gain regulation of a traditional RISE control method, and acquires better tracking performance.

The invention discloses a method for managing automobile lines by GPS technology. The method provides a method for analyzing and summarizing the operation condition of a coach bus in the traveling process by regulating lines by a map engine and utilizing the GPS technology. GPS data uploaded by a car sill in a timing mode is utilized and various kinds of arrangement during previous line regulation are combined to check whether the traveling line, the sectional speed, the stop time arriving at a specified stop, the practical toll, and the like of an automobile in practical traveling are consistent with preset values. The operation condition of an automobile in practical traveling is comprehensively analyzed. The invention provides an effective management method for regulating and supervising the traveling of a coach bus.

The invention discloses a performance limited flexible manipulator control method based on determining learning theory. Aiming at the indeterminacy of the dynamic model of the flexible manipulator, the method designs a tracking error to satisfy the limitation of constraint conditions, and forms an error controller. The method in the invention comprises the following steps: building a dynamic model of the flexible manipulator, building a system state observer, designing tracking error performance constraint conditions, designing a neural network controller based on the determining learning theory, and correcting the controller utilizing experiential knowledge. The method designed in the invention can realize the dynamic properties of rapid convergence and low overshoot, satisfy the limitation of set constraint conditions, avoid the on-line regulations to the neural network weights at the same time, and shorten the control time. In addition, the method can utilize the learned experiential knowledge to control the later same task rapidly.

The invention relates to a solid-state fermentation method for ethanol production based on sweet sorghum stalks (including other sugar raw materials, such as, sugar beet, sugar cane, Jerusalem artichoke, etc) and a system, which pertains to the technical field of the processing of biomass liquid fuel. The method mainly includes the following key processes and core equipments: (1) smashed materials are fed into a tank with the help of the rotary motion of a cylinder body of a rotating drum type solid-state fermentation tank and the dual-function of the inclined angle of the tank body (1 to 15 degrees) and a feeding stirring board so as to be evenly mixed with the high-yield ethanol TSH-Sc-1 yeast liquid which is prayed from a sprayer; (2) the solid-state fermentation is carried out in the facultative oxygen environment, the fermentation tank is rotated at an even speed to promote the mixing of materials and the strengthening of heat transfer, thus the fermentation is always in a best condition and the fermentation time is shortened; (3) on-line monitoring is carried out: the solid-state fermentation is affected by a plurality of factors, such as, the distribution of the on-line regulation temperature of a computer, spray amount, the concentration of dissolved O2, filling factors, the mixing degree of the smashed materials and the yeast liquid, the pH value of yellow slurry, CO2 concentration, ethanol concentration, the migration of bacteria species and other parameters so as to ensure that the solid-state fermentation is carried out under a best working condition; (4) the automatic discharge of the fermentation material from the tank is realized with the help of the rotation of the tank body and the push of a discharging stirring board, and a closed tunnel belt is adopted for conveying the fermentation material to an ethanol-dreg separation unit.

A method and apparatus for power conversion in a class D amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors.

The invention discloses a linear constant current controller, which comprises a chip of the controller, a driving device and an illuminating lamp. The controller is connected to an input voltage source by a constant current source load. The linear constant current controller is characterized in that: the input voltage source provides one-way pulsating power grid voltage for the voltage rectification of an alternating current power grid. The controller comprises a power grid current control circuit and an error amplification circuit, wherein the power grid current control circuit controls the acquisition of power grid current in a current-gaining window of the one-way pulsating power grid voltage based on a voltage division signal from the input voltage source and an amplified error signal; and the error amplification circuit determines the average current of the power grid current based on a detection signal for the power grid current flowing from the power grid current control circuit, and generates the amplified error signal. The efficiency of the linear constant current controller provided by the invention can be remarkably improved; and the linear constant current controller has relatively lower cost and can achieve a relatively higher line regulation rate and a relatively higher load regulation rate at the same time.

The invention relates to a self-adaption voltage regulator based on an optimized PSM modulation mode, belonging to the technical field of power electronics and being used for self-adaption on-line regulation on a power supply voltage of a load processor (CPU or DSP). In the self-adaption voltage regulator, a key path of the load processor is copied by adopting a delay line, an N frequency division signal of a working clock of the load processor is used as a delay test signal, and a trigger is used for detecting whether the transmission speed of the delay test signal reaches the requirement in the delay line. When the load processor is in a certain working frequency, if the VDD (Voltage Drain Drain) is overhigh, the delay test signal can pass through the delay line, a power switch of an external power inverter is trially shut off for reducing the VDD; and when the delay test signal can not pass through the delay line, optimized PSM modulation signals with different duty ratios are trially adopted for conducting the power switch of the external power inverter for improving the VDD, and finally, the load processor is ensured to work with minimum voltage under a given working clock frequency, thus the power consumption of the load processor is effectively reduced.

The invention discloses a resonant switch converter, a control circuit and a control method for automatic dead-time regulation of the control circuit. The resonant switch converter comprises an upper side switch tube, a lower side switch tube, a resonant tank circuit and the control circuit, wherein the control circuit comprises a slope sampling circuit, a slope judging circuit, a clock generating circuit, and a conduction moment control circuit; the slope sampling circuit generates slope signals representing the voltage slope at a common terminal between the upper side switch tube and the lower side switch tube; the slope judging circuit judges whether the slope signals are effective and generates slope judging signals; the time generating circuit generates clock signals; the conduction moment control circuit regulates the dead time between the upper side switch tube and the lower side switch tube according to the slope judging signals and the slope signals. Compared with the prior art, the resonant switch converter, the control circuit and the control method for automatic dead-time regulation of the control circuit can flexibly realize automatic regulation of the dead time, so as to ensure zero-voltage opening of the upper side switch tube and the lower side switch tube, and increase the system efficiency.

The invention discloses a switched reluctance motor on-line modeling method based a RBF (Radial Basis Function) neural network, belonging to the technical field of intelligent control on the switched reluctance motor. The method is used for establishing an off-line model of the switched reluctance motor through a RBF neural network method based on the static data of the switched reluctance motor. On that basis, an error regulation method is designed, the on-line model of the switched reluctance motor is established, and the on-line model has the real-time on-line regulation function and can describe the dynamic characteristics of the switched reluctance motor more accurately. In an experimental process, a method of establishing an input-output mapping relation is used in the on-line modeling method, the problem of overlong operation time of the Gaussian function in a DSP (Digital Signal Processor) is solved, and the realizability of a simulation model in engineering application is ensured, wherein the simulation model is designed based the RBF neural network.

A system to control an asynchronous tri-phase motor where said system comprises: at least one filter directly coupled to the current of the Alternative Current (AC) line; a rectifier which rectifies the line current, a doubler which reduces the curl, elevates the voltage and delivers a voltage in Direct Current, a braking resistance which helps to dissipate energy when the system is in braking mode, a shunt resistance, which helps to measure the current which flows from the V-line between the doubler and the IGBT module, a source, which adapts the voltage which the microcontroller consumes and peripheries (operational amplifiers, detectors, etc.), a line regulator to remove curls and line noise, a microcontroller to process, admit and emit control signals, a potential module which emits a PWM train pulse with a frequency determined by the microcontroller towards the IGBT module when the microcontroller indicates such, an IGBT module, which receives the PWM pulse train adapting and coupling them to an H bridge, to thus allow the flow of high voltage in DC emanating from the doubler towards the electric motor, a retro-feeding line towards the microcontroller to measure current, a velocity detector coupled mechanically to the motor and which sends a signal or pulse train towards the microcontroller; as well as the acceleration or braking methods consistent in the measurement of the slip S of said tri-phase motor.

An electronic amplifier circuit comprising an operational amplifier circuit, such as a two-stage operational amplifier circuit, in tandem with a operational transconductance amplifier. The electronic amplifier circuit has high open-loop gain and high gain-bandwidth while maintaining stability over a wide range of operating parameters.

Systems and methods disclosed herein monitor and control input to a converter in one or more of a UPS, a frequency converter, or a line conditioner. Distortion due at least in part to ripple voltage can be removed from a control signal that controls input current to the converter. The systems and methods described herein afford a simple and effective way to reduce or eliminate one or more of subharmonic oscillation and total harmonic distortion from a converter input current during synchronous and asynchronous modes of operation. The converter may include one or more of a rectifier and an inverter.

This disclosure describes systems, methods and articles of a passive EMI filter integrated with an active boost converter for low-side line transients and / or an active clipper for high-side line transients. During steady-state operation, the active circuitry is disabled so the circuit functions as a passive EMI filter. Inductive and capacitive components used in the passive EMI filter during steady-state operation may serve a dual role and become part of a boost converter when input voltage is below a low-line steady-state and, in some variations, the inductive and capacitive components may become part of a transient clipper when the input voltage is above a high-line steady-state level. The transient clipper may be implemented as a linear pass element or as a switch-mode converter (e.g., buck converter).

Techniques for efficiently stabilizing an output voltage produced by a voltage regulation circuit are disclosed. One embodiment pertains to a voltage regulation circuit that includes a supplemental current source that can be controllably activated to provide a supplemental current to an output terminal of the voltage regulation circuit. This supplemental current can then assist in stabilizing the output voltage level at the output terminal of the voltage regulation circuit even in the presence of high current surges by a load (i.e., electronic circuitry). Advantageously, given the availability of the supplemental current, the required amount of capacitance for a decoupling capacitor (also coupled to the output terminal of the voltage regulation circuit) can be significantly reduced. In the case of semiconductor electronic devices, the reduction in the needed capacitance yields substantial die area savings with respect to decoupling capacitors.

The invention provides a switching power supply and a circuit improving an output current regulation factor of the switching power supply. The circuit improving the output current regulation factor of the switching power supply comprises a voltage amplifier, a voltage comparator, a peak value sampling hold circuit, an error amplifier, a voltage regulator and an RS trigger, wherein the peak value sampling hold circuit carries out sampling hold on sampling voltage after pre-amplification, carries out hold on the peak value of the sampling voltage after pre-amplification, and generates peak value hold voltage, the error amplifier generates a voltage control signal after carrying out comparison on the peak value hold voltage and external reference voltage, the voltage control signal ascends or descends according to the comparison result between the peak value hold voltage and the external reference voltage, the voltage regulator regulates the voltage value of output internal reference voltage according to the voltage control signal, the internal reference voltage descends when the voltage control signal ascends, and the internal reference voltage ascends when the voltage control signal descends. The switching power supply and the circuit improving the output current regulation factor of the switching power supply are large in range of applicable parameters and high in accuracy, and have the obvious advantage of improving the output current line regulation factor.

The invention relates to the technical field of road traffic and provides an urban road traffic management system based on a dynamic marker line. According to the traffic flow peak of an urban road, the urban road traffic management system based on the dynamic marker line adjusts the display state of the dynamic marker line on a road and traffic flows in different directions of the urban road at regular time. The urban road traffic management system comprises a traffic flow data acquisition module, a data storage module, and a dynamic marker line regulation and control module. The dynamic marker line regulation and control module is used for timely obtaining data m which is sent by the data storage module at regular time, adjusting the display state of the dynamic marker liner according the value of m, and changing the display state of the dynamic marker line, wherein a main urban road with a small traffic flow is changed from an original multilane into a single lane, meanwhile other lanes in the same direction as the single line are changed into lanes in an opposite direction, so as to increase the number of lanes in the opposite direction and to reduce the current traffic flow. The urban road traffic management system provided by the invention achieves reasonable adjustment for imbalance usage of the road surface of the urban main road at some period, and can effectively solve the traffic jam problem.

A DSL line conditioner achieves high performance sufficient to simultaneously support video, voice and data signals on standard telephone twisted pair lines over substantially greater distances than are currently available. The line conditioner automatically adjusts and sets the upstream and downstream preamplifier gains and attenuations according to the actual degradation imposed upon the upstream and downstream signals by the twisted pair line in which the line conditioner is used. The line conditioner achieves high performance by optimizing the signal-to-noise ratio and signal quality of DSL signals, and has a low power budget that enables it to operate by deriving power from the twisted pair lines over which it is used.

The invention discloses a SVG-based multi-objective on-line regulation and control method for power quality management equipment group, comprising the following steps: real-time collecting bus voltage, current and load current signals and calculating system parameters; The capacity of the power quality management equipment group is allocated, and the intelligent allocation strategy is adopted to control the equipment. The load harmonic distortion rate and its contents are measured, and the frequency dividing compensation strategy is used to control the equipment. According to different controltargets, the adoption of an intelligent allocation strategy, Energy replacement strategy and frequency division compensation strategy can optimize the equipment configuration, coordinate and controlthe output proportion of equipment group, realize the multi-objective automatic regulation and control of power quality management equipment group in the region, solve the mutual influence problem between multi-power quality management equipment, and improve the overall power quality management ability and efficiency.

The invention discloses a segmented magnetic control method of an AC magnetic control memory motor. The segmented magnetic control method comprises the following steps of adding a magnetic control pulse module to a control system so as to achieve on-line regulation of motor flux linkage; selecting n target magnetic states during the running process of the motor, determining intersection points ofa corresponding T-N curve and a motor rotational speed corresponding to each intersection point; and determining the lowest magnetic level during the magnetic control process of the motor according toa relation between Psi<pm> / Ld and i<smax>, and only performing traditional armature current weak magnetism, wherein a permanent-magnet field is not weakened by magnetic control pulse any longer. In order to achieve optimal magnetic control effect, the rotor position at magnetic control initial moment and magnetic control pulse phase are reasonably allocated. Compared with a traditional weak magnetism expansion method, the segmented magnetic control method has the advantages that the direct-axis current component during the running process of the motor can be greatly reduced, the stator copperconsumption of the motor at a high-speed running zone is reduced, frequent on-line magnetic control of the permanent magnet is prevented, and the running efficiency of the motor and the practicability of the control system are improved.

The invention discloses a magnetic suspension aerodynamic bearing, which comprises a bearing body, tilting bearing bushes and electrostrictive blocks. The centers of the tilting bearing bushes are connected with the bearing body; two ends of the electrostrictive blocks are connected with the tilting bearing bushes and the bearing body; the electrostrictive blocks are connected with voltage regulator modules; electromagnet structures are symmetrically distributed in the bearing body; electromagnets are connected with current regulator modules for regulating a magnetic force; and an air gap sensor for detecting a gap between a rotor and each bearing bush is further arranged on the inner surface of the bearing. According to the magnetic suspension aerodynamic bearing provided by the invention, the bearing capacity of the bearing is greatly improved, the energy consumption is effectively reduced, meanwhile, the magnetic suspension aerodynamic bearing is used for carrying out work condition monitoring, fault diagnosis and on-line regulation in real time, and the intelligent management of the bearing is realized.

The invention provides a strip shape fuzzy control method of cold-rolled stripe steel. A working section of the outlet tension of a rolling mill and a working section of the rolling pressure of the rolling mill are divided into n branch sections respectively, and rolling conditions are classified to n2 working conditions according to all possible conditions of the different sections where the outlet tension and the rolling pressure of the rolling mill located; corresponding strip shape control fuzzy inference control models are established respectively; related fuzzy membership functions in the strip shape control fuzzy inference control models are determined by combining the physical characteristics of a roller pouring device, a working roller bending device and a middle roller bending device; strip shape fuzzy control models are established by using a Takagi-Sugeno fuzzy model establishing rule; corresponding strip shape fuzzy control models are selected according the working conditions in a rolling process to carry out on-line regulation of the roller pouring device, the working roller bending device and the middle roller bending device. The strip shape fuzzy control method of the cold-rolled stripe steel solves the technical problem that due to the fact that a conventional strip shape control method cannot obtain the high-precision regulation and control efficacy coefficient of strip shape control, strip shape defects exist in the cold-rolled strip steel products.