A chart design method for multi-coil resonant wireless power transfer (MC-RWPT) systems is presented in the paper. MC-RWPT system is described by a matrix model, which in combination with the coupling calculation method and after applying the optimization procedure, is used to determine the design charts. First, the transfer efficiency is depicted as a function of the number of applied coils and the relative transfer length. Next, the relations between the rest of the system parameters are identified. The influence of the winding filling factor and the relative air gap between the adjacent coils on the kQ factor are also discussed. The proposed chart design method has been experimentally verified. Representative parameters, voltage / current waveforms and the distribution of RMS currents of the coils of the MC-RWPT system are presented.

This paper presents new resonant inverter topologies for dual-frequency induction heating (IH). These 2T1C and 3T topologies combine the advantageous features of two- and one-inverter solutions. An analytical description of the load impedance of a dual-frequency series-parallel circuit has been made. Using manufacturer datasheets and LTspice models of selected transistors, a MATLAB model was parameterized. Based on it, power losses are determined as a function of the following parameters: nominal power, frequency and DC bus voltage. The obtained results allowed for determining the data necessary in the design process. The research has been experimentally verified. Tests were carried out for pulsing and simultaneous operation. Power control characteristics as a function of frequency are determined. The possibility of operating the inverter with high efficiency (>97%) in the proposed 2T1C and 3T systems at nominal power is demonstrated.

The paper presents the design and tests of a wheeled mobile robot. The construction of the machine is based on a differential drive. A three-layer structure of the robot control system has been developed. The lowest layer is based on an 8-bit microcontroller and its purpose is to control motors and sensors of the robot. The medium layer is based on a 32-bit ARM Cortex M4 microcontroller. There has been implemented an x86 architecture computational unit as the main part of the highest layer of the control system. A control software developed for this computer is responsible for the acquisition and processing of an image stream from the camera mounted on the robot board. The software has been implemented using Aforge.NET library. Selected image processing filters have been tested in order to enable object tracking and gesture recognition in the mobile robot control system. Finally, a power consumption of the computational unit operating in several developed control modes has been measured.

The paper shows the construction and operation of the High-Voltage High-Frequency Coaxial Cable Energy Transfer System dedicated to a three-phase 500 V mining grid with an ungrounded neutral point. The correct operation of the model was verified through simulation and experiments. This paper focuses on the overall system efficiency and the power loss analysis of its components. Based on these measurements, it is concluded that the presented system is suitable for mining applications, where high energy conversion efficiency is essential due to the difficulty of dissipating heat to the environment.

Wydawnictwo SIGMA-NOT wydaje czasopisma fachowe informuj?ce swoich czytelnik?w o najnowszych osi?gni?ciach naukowych i nowoczesnych rozwi?zaniach technicznych w Polsce i na ?wiecie, popularyzuje problemy techniczne oraz poszerza wiedz? i kultur? techniczn?.

The paper presents the design and validation of a control algorithm for an induction heating system with a half-bridge inverter, using Processor-in-the-Loop (PIL) simulation and the LaunchXL-F280049C hardware platform. The proposed PI controller ensures accurate control of the inverter supply current and is characterized by a dynamic response to setpoint changes. The PIL simulation results were experimentally confirmed through voltage and current waveform measurements at the inverter output, as well as through effective heating of a graphite crucible load.