Single-chip fuzzy logic controller design and an application on a permanent magn

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1、Single-chip fuzzy logic controller design and an application on a permanent magnet dc motorSinan PravadaliogluI.M.Y.O., Control Sys. Department, Dokuz Eylu University, Menderes cad, Istasyon sok 5, Buca, 35170 Izmir, TurkeyAbstractThis paper describes a low-cost single-chip PI-type fuzzy logic contr

2、oller design and an application on a permanent magnet dc motor drive. The presented controller application calculates the duty cycle of the PWM chopper drive and can be used to dcdc converters as well. The self-tuning capability makes the controller robust and all the tasks are carried out by a sing

3、le chip reducing the cost of the system and so program code optimization is achieved. A simple, but effective algorithm is developed to calculate numerical values instead of linguistic rules. In this way, external memory usage is eliminated. The contribution of this paper is to present the feasibili

4、ty of a high-performance non-linear fuzzy logic controller which can be implemented by using a general purpose microcontroller without modified fuzzy methods. The developed fuzzy logic controller was simulated in MATLAB/SIMULINK. The theoretical and experimental results indicate that the implemented

5、 fuzzy logic controller has a high performance for real-time control over a wide range of operating conditions.Keywords: Dc motor drive; Fuzzy logic controller; Microcontroller; Application; Simulation1. IntroductionIn switch-mode power supplies, the transformation of dc voltage from one level to an

6、other level is dcdc conversion and accomplished by using dcdc converter circuits, which offers higher efficiency than linear regulators. They have great importance in many practical electronic systems, including home appliances, computers and communication equipment. They are also widely used in ind

7、ustry, especially in switch-mode dc power supplies and in dc motor drive applications. The dcdc converter accepts an unregulated dc input voltage and produces a controlled dc output at desired voltage level. They can step-up, step-down and invert the input dc voltage and transfer energy from input t

8、o output in discrete packets. The one disadvantage of dcdc converters is noise. At every period to charge in discrete packets, it creates noise or ripple. The noise can be minimized using specific control techniques and with convenient component selection. There are well-known control techniques inc

9、luding pulse-width modulation(PWM) where the switch frequency is constant and the duty cycle varies with the load.PWM technique affords high efficiency over a wide load range. In addition, because the switching frequency is fixed, the noise spectrum is relatively narrow, allowing simple low-pass fil

10、ter techniques to reduce the peak-to-peak voltage ripple. For this same reason, PWM is popular with telecom power supply applications where noise interference is of concern.The most important requirement of a control system for the dcdc converter is to maintain the output voltage constant irrespecti

11、ve of variations in the dc input voltage and the load current. However, load changes affect the output transiently and cause significant deviations from the steady-state level of dc output voltage, which must be controlled to equal a desired level by the control systems. The inherent switching of a