Papers by Keyword: Hysteresis Control

Abstract: This Paper Describes Application of the Hysteresis Control to the Single-Inductordual-Output (SIDO) Power Supply Circuit to Realize High Performance, Low Cost and Small Sizepower Supply Circuits. the Sidos can Realize Small Number of Inductors (hence Small Size Andlow Cost) in the System where Multiple Power Supplies are Required, but their Performance Isnot Very Good if Conventional SIDO Control Methods are Used. we Show with Simulation Andexperiment that the Hysteresis Control can Realize High Performance SIDO Converters.

Abstract: This paper proposes a hysteresis current control method for the grid-connected quasi Z source inverter with three states and constant frequency. The hysteresis band of the inverter is analyzed in detail, and the shoot-through is inserted into the zero state without affecting the grid-connected control. Moreover, the operating states of the switches are discussed. Finally, the feasibility of the proposed topology is verified by simulations and experiments results.

Abstract: Double tank level control system is the combined control with the host computer and basic instrument, and it realizes the communicative function through monitoring and management. The object of this topic is mainly on double-tank system, then gets the theoretical parameters PID through measuring the characteristic curves of the water level, and finally use MCGS configuration software on PC, for further interaction interface to the parameters tuning of double-holding water tank system and to set the parameters. After reaching the expected target, on the base of routine control PID, we can improve the system function by forming the double loop system and control the liquid level of the water bank better. The two tank liquid level control is made as the core control system by computer and as one kind of fashionable trends.

Abstract: The AC electronic load circuit is studied, PWM converter is used in this circuit in order to achieve the simulation function of load characteristics.The methods of how to get the command current mathematical model and simulation module is given which is based of the Matlab/Simulink platform, Hysteresis control mode is used in order to get fast and stable actual current and then carried on the simulation of the proposed electronic load. The simulation results show that the proposed algorithm and the control instruction current method and the effectiveness of the current control method, realized the simulation of ac electronic load.

Abstract: A simulation model was built based on the Simulink module in the Matlab to study the effect of DC power harmonics to hysteresis current control performance. The DC power supply in the hysteresis current control circuit was obtained by a three-phase rectifier circuit, and the harmonics of DC power supply vary with the value of the capacitor which was in parallel to the rectifier circuit output. The result of experiment shows that the harmonics cause the inverter output waveform distortion, even cause hysteresis current control tracking failure.

Abstract: In order to get the stable output, the small switch pressure resistance and the high power factor with the high power three-phase rectifier, the three-phase VIENNA PFC circuit topology was studied, and the principle of VIENNA rectifier was investigated, based on the original concept of the control method, the interval control with hysteresis control method were used to control the whole rectifier circuit. Throughout the system design had been completed, the MATLAB model is built for the design of the circuit simulation, the simulation results show that the system output is stabilizing output, and the pressure resistance of the switch device is half of the output voltage, and the input power factor is 1.And set up some small prototype to verify the control method of the rectifier.

Abstract: In this paper, a new application of three-phase inverter using zero-vector control is proposed. In order to control the amplitude of output current, the d-q axis coordinate transformation, hysteresis controller and space vector strategy are adopted. Besides, the frequency of output current also can be adjusted by zero-vector control. Therefore, the proposed inverter has lower switching loss, higher system efficiency and better dynamic response. Use VisSim simulation software and TI TMS320F28335 chip to implement the proposed control strategy. The controller has several advantages such as easier to control, smaller circuit size and fully digital design etc. Finally, the experimental results are compared with the proposed theory for verifications.

Abstract: Although many converter control circuits have been integrated digitally, digital circuits are limited by the sampling rate, the processor frequency and other factors, and the response speed is slower than the analog circuits. In this paper, the combination of PI regulator and hysteresis loop PWM control is adopted to set up a DC/DC analog control circuit. The simulations and experiments show that the design achieves DC/DC bi-directional conversion and phase-shifting output. The DC/DC transformation function has been realized safely and reliably.

Abstract: Aiming at the problems of complex circuit and parameter adjustment in traditional current type power amplifier of Magnetic Bearing (MB), a new realization method of control system based on DSP (Digital Signal Processor) is proposed. The difference with traditional power amplifier is that the current control loop is realized through software in DSP, so some advanced control strategies will be adopted easily, and the control parameters could be modified freely. Besides, the models established in MATLAB using common control strategy and advanced strategy are simulated separately, and the simulation results show the better effect can be obtained with the latter. Finally, the rotor of a 1-DOF MB prototype can be suspended within 0.01mm in the experiment, and the control strategy and parameters can be modified freely by software in DSP.