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The losses of realistic litz wires are characterized while explicitly accounting for their construction, using a procedure that computes the current-driven and magnetic-field-driven copper losses using fast numerical simulations. We present a case study that examines loss variation in one- and two-level litz wires as a function of twisting pitch, over a wide range of values and in small increments...
An optimize design process of inductors and transformers used in switching power converters is presented in this paper. An analytical modeling of conductor physical behavior was developed to match optimization requirements, and used to compare various components with different cores — coils geometries and wire technologies. Rigorous analytical modeling was applied to achieve minimization of the losses,...
Traditional induction heating cooktops typically employ a circular planar coil in resonance excited by a switching inverter. This configuration results in stray magnetic fields below the coil and non-uniform heating profile on the top. This paper presents the concept of multiphase, multi-resonant induction heating using a Halbach winding arrangement to eliminate the shortcomings of the traditional...
Energy monitoring and control strategies can be asymmetrical, chasing pennies of hoped-for savings with dollars of installation and monitoring expense. Modern sensors can be used to accurately measure voltage and current without the requirement for a permeable magnetic core or the need to surround the conductor, e.g., with a Rogowski coil. These sensors can be used to find currents and voltages without...
A model is proposed for the calculation of the winding losses at the beginning of the design process of high frequency transformers and inductors. Although this kind of losses have been subject of investigation for years, their analytical calculation in gapped components is still limited, and the use of numerical analysis tools, such as finite elements analysis (FEA) tools, are commonly needed for...
The Dowell expression is the most commonly used method for the analytic calculation of the equivalent resistance in windings of magnetic components. Although this method represents a fast and useful tool to calculate the equivalent resistance of windings, it cannot be applied to components that do not fit with classical 1D assumption, which is the case of gapped magnetic components. These structures...
Nanocomposites are becoming known as a class of materials that possess the capability to operate at high switching frequencies and handle high power levels. Understanding how their loss characteristics scale and thermal behaviors change as core geometries are altered is vital when designing for grid applications. This article utilizes ANSYS Maxwell finite element analysis (FEA) software to predict...
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