Persons

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Nowadays, predictive control systems are becoming more and more popular, which significantly reduce the cost of setting up converters. However, DC-DC converter control problem persists. In this work, a modified model of the predictive control system (MPCS) for step-up DC-DC converters is presented. For its implementation, a nonlinear model of a converter with discrete time switching was derived, which describe a continuous conduction mode of operation. The synthesis of the controller was achieved by formulating the objective function that should be minimized considering the dynamic model of the converter. The proposed predictive control strategy, used as a voltage control system, allows keeping the output voltage at the reference level. The modified system for calculating the objective function makes it possible to significantly reduce the required computing power and expand the prediction horizon. The results of modeling have been presented that demonstrate the advantages of the proposed control method: a fast transient response and a high degree of robustness.

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The printing time and accuracy are the main problems of a 3D printer. To obtain the high accuracy of the position of the motor shaft and to solve the problem of the missing step, it is necessary to use a DC motor instead of a stepper motor. In this study a block diagram for controlling the position of the DC motor shaft with a closed loop has been proposed, and controlling the position of the DC motor shaft, using the Atmega328 microcontroller, the L293D driver and the encoder, has been executed. The use of a DC motor with a closed control system in a 3D printer eliminates the «missing step» problem, improves the accuracy and dynamic characteristics of the system, and, also reduces the noise level when operating a 3D printer.

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The induction motor control device based on the IGBT-modules with the microprocessor control has been considered.

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