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The paper presents an overview of heat transfer specifics of magnetic components for power electronics. The loss dissipation in power electronics is mainly based on convection and radiation heat transfer, thus improved models for estimating these mechanisms are presented and compared. The focus is on improved models of convection heat transfer utilizing derived values of the exponents of component...
This paper presents a converter for charging and equalizing voltages across energy storage elements (ESE) — superconductors or rechargeable batteries, which are connected in series. The converter operates in soft switching mode: ZVS conditions are provided. The charged elements are galvanically separated from the main by high frequency transformers. Transformers and rectifiers can be made constructively...
This paper presents a recursive algorithm for adaptive observation of linear single-input single-output (SISO) time-invariant discrete systems. The problem of state observation is of main importance in automatic control, especially for designing modal state controllers when the state variables of the system are unknown. The proposed algorithm is based on the recursive extended least-squares (RELS)...
The paper presents design considerations and a loss analysis of dc chokes in kW range, realized by different magnetic materials. Five designs under the same input parameters are realized with three different materials: ferrite (3F3), powder (sendust MS) and amorphous material (Microlite 245). An optimal design procedure is considered aimed at minimizing losses and volume of the component. A set of...
The paper presents comparison and design considerations of power electronics transformers in 25 kHz–400 kHz range. Improved design algorithm consisting of 15 steps is applied. Five designs of power transformers under the same input parameters are realized based on different frequencies: 25kHz, 50kHz, 100kHz, 200kHz and 400kHz. The material used is ferrite (N87). The design is aimed at minimizing losses...
This paper presents a design methodology for an inductor for induction heating device. The proposed design algorithm provides optimal selection of the inductor pipe, size and dimensions. Electrical parameters of the coil are also derived. The main steps of the design procedure are described. The methodology steps are in accordance with the specific assigned operating parameters and the geometric dimensions...
The paper presents investigation and analysis of the deviation of operating parameters of a resonant inverter for induction heating of fluids and resulting possible emergency situations (cases). Full study of 4 different emergency cases of the considered induction heating inverter is presented. The over currents through the switches are found, as well the slope of the current rising. An approach to...
In this paper magnetic properties and global operating parameters of nanocrystalline and ferrite materials are compared. It is figured out that because of their marvelous magnetic properties the nanocrystalline materials are the future magnetic materials in power electronics. The losses of three toroidal nanocrystalline cores (Vitroperm 500F) are investigated under typical for power electronics square...
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