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Contactless power transfer (CPT) is an emerging topic which relies in high frequency resonant inverters to transfer power from a transmitter to a physically separated receiver inductively. Capacitive compensations on both the primary and secondary sides of a loosely coupled transformer are usually employed in recent researches in order to enhance the power transfer capability and the system efficiency...
The AC/AC single-phase/single-phase Modular Multilevel Converter (MMC) presents very interesting features for the realization of a Medium Frequency Power Electronic Transformer for traction applications, in AC-fed or multisystem railway rolling stock, like locomotives, Electric Multiple Units (EMU), high-speed units, and so on. Aiming to maximize the output frequency of the converter, i.e. the operating...
The concept of a hardware-in-the-loop method of implementing open-loop control of a three phase modular multilevel converter (MMC) using a cyclone II FPGA (field-programmable gate array) device on an Altera DE2 board is presented. Control signals are generated for the lower and upper level of each arm of the MMC by comparing reference signals with a carrier signal. This MMC topology employs a large...
The article describes a feedback Preisach hysteresis model equivalent circuit implementation of a medium frequency single-phase transformer being a part of a high power and high efficiency DC-DC converter. The macroscopic models of magnetic hysteresis are introduced and the feedback Preisach model is selected for further analysis. The hysteresis model is developed for a prototype transformer and the...
The authors have proposed the single-stage bidirectional buck AC/DC converter. This paper presents comparison of loss and volume between the proposed single-stage buck AC/DC converter and the conventional two-stage AC/DC converter. The effectiveness of the proposed single-stage buck AC/DC converter is verified by experiments.
This paper presents a new mathematical model and a PWM switching technique for a three-phase grid-tie bidirectional DC-AC converter. The converter topology is designed based on linking an H-bridge to a three-to-single-phase matrix converter through a single-phase high-frequency transformer. The proposed mathematical model uses the trapezoidal waveform approximation for the high-frequency current waveform...
This paper presents a model of a complex electromechanical system based on a new type of electromechanical converter — a field regulated reluctance machine (FRRM). The problem of optimal regulation of a multiphase electromechanical converter is formulated according to the criterion of minimum costs for the installed power of an electric drive and a semiconductor converter. The second task of optimizing...
One of the main revenue streams of the power system industries is provide a stable frequency all the time. Energy storage systems are well suited for the purpose because of their bidirectional capabilities. Recently converter based energy storage system has been gaining interests for providing frequency response replacing traditional generator based solutions due to the speed of the power electronic...
A transformerless multicellular dc-dc converter has been newly proposed. The capacitively isolated dc-dc cell converters have been applied to develop the multicellular converter without using high frequency transformers. The high voltage transformation ratio is achieved by the ISOP (Input Series Output Parallel) connection topology of the cell converters and the realization of the highly efficient...
This paper presents a completely wireless small cell unit for mobile communication systems with lowest possible power consumption. It consists of a simple frequency conversion from millimeter-wave backhaul to access frequencies based on the self-heterodyning concept with only analog amplifiers as active components. This enables an energy autonomous operation based on tiny solar panels, greatly simplifying...
In this study, two-channel surface electromyogram (sEMG) signals were used to classify hand open/close with fingers. The bispectrum analysis of the sEMG signal recorded with surface electrodes near the region of the muscle bundles on the front and back of the forearm was classified by extreme learning machines (ELM) based on phase matches in the EMG signal. EMG signals belonging to 17 persons, 8 males...
This paper presents the analysis of an AC-AC converter used in partial discharge test. In this paper, the analysis of the frequency converter is separated into two parts. Firstly, the converter models are simulated by a circuit simulation program for comparing noise signals generated by the 2-level SFC and 5-level SFC. The frequency of the converter was set to be 200 Hz. With the help of the simulator,...
In this paper, it is proposed to use a matrix converter for linear induction motor (LIM) drives. A matrix converter is a direct AC-AC converter. It has the potential to regenerate power and to connect directly across the AC power line, thus it is possible to improve the efficiency in the entire system of LIMs drive. In this experiments, the operating characteristics of the matrix converter were examined...
This paper presents the design of a low-power quadrature oscillator for frequency synthesis in intermediate frequency over fiber (IFoF) applications at the lower-end of the 5G WiFi band. It is formed by two class-B LC-VCOs connected in a cross-coupled configuration. A cascaded architecture has been used for the coupling stages in order to stabilize the oscillation by minimizing bimodal oscillation...
With ever increasing requirements on the linearity of SAW signal processing devices in mobile communication, nonlinear effects like harmonic generation and intermodulations have gained renewed interest and have become an active field of research with the aim of identifying their origin, analyzing and counteracting them. In this contribution we focus on second-harmonic generation in SAW resonators...
There have been great interests in the nonlinear behavior of SAW resonators but realistic models for their frequency response characteristics have been limited. We present a general purpose finite element model that yields directly the nonlinear frequency response of second harmonic generation in SAW IDT resonators. The nonlinear model enabled us to study the effects of nonlinear material constants,...
This paper presents the design of a low-complexity, linear and sub-pF CMOS capacitance-frequency converter for reading out capacitive bacterial bio/sensors in an attempt to create a widespread bio/sensor readout module. The significant design objectives included a high resolution as well as an extensive dynamic range. The circuit was based on a method which outputs a digital frequency signal directly...
Nonlinear Lamb wave has been widely acknowledged as an efficient Nondestructive Testing (NDT) for detection early stage of fatigue damage. The previous studies focused on the evaluation of fatigue damage using the particular mode pairs, such as S1-S2 mode pair. Recently, Nonlinear S0 Lamb mode with low-frequency was considered for its unique features of less dispersion and easy to be generated, and...
Mechatronic modules with field regulated reluctance machine have improved mass-size parameters and can be used to drive the actuator valve of metallurgical production. The article shows the stages of synthesis of a mechatronic module elements': the selection of the parameters of the electric drive's power elements (the main dimensions of electromechanical converter), the control system (speed control...
This paper presents a multi-channel transmitter (TX) architecture that uses only a single bulk acoustic wave (BAW) resonator while covering 88 MHz of bandwidth. The proposed architecture overcomes the limited tuning range of a single BAW resonator by combining the BAW tuning range with a programmable integer-N frequency division and RF single-sideband (SSB) mixing approach. The single-BAW multi-channel...
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