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This paper presents a GaN transistor half-bridge prototype with robust pulse by pulse current limiting drivers designed to turn off safely the transistor for the rest of the PWM period when the drain current exceeds the set value. The half-bridge is intended as the key part of a DC/AC converter output stage with operating frequency up to 1 MHz. The current limiting circuit is designed to meet the...
Operation of two-coil inductive power transfer (IPX) is affected by the bifurcation phenomenon. So far, its dependence on primary and secondary quality factors was examined. However, similar dependencies exist for coupling coefficient and resonance frequency. In this paper, these dependencies and their mutual relationships are examined. This analysis is based on the normalized impedance approach and...
The proper control of induction motor drive is an important task in many applications. Usually, the motor is supplied from voltage source inverter and the required voltage is calculated according to the actual and past states of the motor. Unlike this, the predictive methods calculate also the future state and adjust the voltage accordingly. The model predictive control method calculates the effects...
Direct torque control (DTC) is one of the best performing strategies for induction motor control in many applications. However, this method suffers from a few disadvantages. Very important one is the presence of ripples in the torque waveform. The main reason of their presence is the inaccurate model of the motor. This paper utilizes Luenberger observer to calculate the model of the motor instead...
Sophisticated control of induction motor drive requires knowledge of the rotor angular velocity. In order to obtain the speed information an optical sensor is usually utilized. However, it is not always advantageous because of the whole drive robustness decrease caused by the speed sensor inclusion. The paper presents some simulation and measurement results in case of the MRAS (Model Reference Adaptive...
Considering the disadvantages of induction motor drive such as torque ripple and current waveform distortion when using direct torque control (DTC) method, the method substitution might improve the drive behaviour. The authors suggest instead of the DTC method using the predictive method based on similar principles. In the paper, both methods are examined. Then on the induction motor drive yet controlled...
In most cases, using of an optical sensor represents the most common solution to obtain the induction motor actual speed. As in some cases the use of the speed sensor carries number of problems, an effort to find a solution that does not require a speed sensor is obvious in recent time. The paper presents some results of employing MRAS (Model Reference Adaptive System) method for sensorless induction...
Implementation of the Field Oriented Control and of the Direct Torque Control in matrix converter supplied induction motor drives is analysed in the paper. Comparison with the implementation in drives supplied by the Voltage Source Inverter is carried out. The analysis is accompanied by the results of numerical simulations and experimental implementations of these two control methods.
The paper describes the basic knowledge about the matrix converter two-step commutation method that was realized on our department. This commutation strategy was implemented in VHDL for FPGA and was simulated in Simulink/Modelsim (cosimulation). The new developed two-step commutation method is two-time faster than the formerly implemented four-step commutation method. But the cosimulation in MatLab...
The presented paper deals with the matrix converter induction motor drive with emphasis on the PWM modulation strategies design. Matrix converters provide an all-silicon solution to the problem of converting AC power from one frequency to another, offering almost all the features required of an ideal static frequency changer. They possess many advantages compared to the conventional voltage or current...
The presented paper deals with the matrix converter induction motor drive with emphasis on the PWM modulation strategies design. Matrix converters provide an all-silicon solution to the problem of converting AC power from one frequency to another, offering almost all the features required of an ideal static frequency changer. They possess many advantages compared to the conventional voltage or current...
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