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... round wires are normally used, but under specific conditions where skin effect would lead to dissipation problems, so-called Litz-wire with strands of a few hundred microns diameter can also be used. Figure 10 shows the different cross-sections for a double E-core and bobbin assembly. The ratio of the total copper area to the winding window area is defined as the copper fill factor k Cu and is given by The (specific) power dissipated per unit of copper volume can be calculated by: ...
Context 2
... whose operating voltage is alternating: harmonic filtering (Section 3.2), commutation (Section 3.4), resonance (Section 3.5), commutation aid or semiconductor protection (Section 3.6). Figures 10 and 11 show the different technologies, with their voltage application domain and their r.m.s. current-to-capacitance ratio. ...
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Citations
... However, the primary challenge in the DC/DC converter is to scale the passive components such as inductors and capacitor [6]. For the inductors, the empirical approach is used to estimate the relationship between the inductor airgap and number of turns, the inductor value and the inductor current, while a fast design technique is used to evaluate the total inductor weight according to the inductor current ripples. ...
This article presents the scalable and accurate modelling technique of a Wideband Gap-based (WBG) bidirectional DC/DC converter to achieve high efficiency while satisfying a set of design constraints. Using Si and SiC-based switches, the converter is scaled for different power ratings (10kW~50kW). Moreover, to scale the passive components of the DC/DC converter empirical design approach is developed for inductor while the systematic approach is used for capacitor selection. The accuracy (~95% accurate) of the inductor design approach is verified by the Finite Element Method (FEM) COMSOL software and accurate loss model is validated using the MATLAB tool Simulink®. The proposed study reduces 60% of core losses in comparing with a conventional silicon core, reduces 2.5% of output voltage ripples while maximum efficiency is obtained up to 98.5% at 30kW load using CAS120M12BM2 SiC MOSFET module.
... These reactive components are used for intermediate energy storage but also perform voltage and current filtering. They generally represent an important part of the size, weight and cost of the equipment [2,3]. ...
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In induction heating applications, active and passive power components play important roles for proper functioning of power controllers. For suitability study, the characterization of active power components is well defined and documented. Characterization of capacitors is also well defined. They are commercially available as well. High-frequency power magnetic components such as transformers and inductors are not readily available. For better power density and reliable operation of controllers their qualitative evaluation is necessary. The parametric set to define the suitability of finished high frequency magnetic components is large and wide, have multiple and complex heat sources. Multiple choices are available for input materials. Two main ingredients in high frequency magnetic components are the magnetic core and litz-wire conductor. This paper, using inherent features of ZVZCS SRI topology, explores practical methods to validate the optimal design of high frequency power transformer for induction heating applications. The method is able to evaluate the usable current density of litz wire conductors as well as the upper limit of usable flux density of nanocrystalline cores.
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