Comprehensive accuracy examination of electrical power loss measurements of inductive components for frequencies up to 1 MHz

Stolzke, Tobias; Ehrlich, Stefan; Joffe, Christopher; März, Martin

doi:10.1016/j.jmmm.2019.166022

Cited by 6 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, to verify the behavior of the magnetic flux density (B [T]) versus the magnetic field intensity (H [Am −1 ]), a ring core fabricated with the same material used in the pot cores was characterized at the Chair of Electron Devices at FAU [60]. The ring core before and after winding is shown in Fig.…”

Section: Evaluation Methodology Of the Modules A Applied Methods For ...mentioning

confidence: 99%

Transcutaneous Energy Transfer System for Cardiac-Assist Devices by Use of Inhomogeneous Biocompatible Core Material

et al. 2021

View full text Add to dashboard Cite

A novel magnetic liquid silicone rubber composite core design applicable to wireless power transfer (WPT) for medical applications is presented. As a case study, the integration of WPT, including the proposed cores for the coils, with ventricular assist devices (VADs) was investigated. This facilitates transferring 4.6 W of power wirelessly through the skin-layer, which thus allows to dispose of the transcutaneous cable that connects the extracorporal batteries to the implanted blood pump. To enhance the coupling coefficient and consequently increase the WPT efficiency, the geometry of the cores was optimized. This reduces the temperature increase in implant area. The field and thermal simulations were carried out with CST software. The electrical properties of the proposed design as obtained by simulation were validated by measurements. The simulation results perfectly coincide with the measured results. Finally, a new optimized design with additional high permeability core inserts is introduced to further increase the coupling coefficient. The results indicate that the coupling coefficient is increased from 0.31 to 0.52 with the optimized design, in comparison to the case without cores. Moreover, by fixing the initial temperature as 37 • C, the maximum temperature is decreased from 38.19 • C to 37.27 • C, while keeping the transferred power fixed. Its high magnetic conductivity, biocompatibility, low-loss property, flexibility and Qi-standard compatibility make the proposed WPT design an excellent candidate for the wireless-powering of heart assist devices such as VADs.

show abstract

Section: Evaluation Methodology Of the Modules A Applied Methods For ...mentioning

confidence: 99%

Transcutaneous Energy Transfer System for Cardiac-Assist Devices by Use of Inhomogeneous Biocompatible Core Material

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Figure 20b illustrates the FEM simulation results of the maximum magnetic flux density at the nominal operating point (f sw,LLC = 1 MHz, I prim = 7.6 A, I sec = 6.5 A), which is used to calculate the core losses for the selected Fi337 material. On average, the core is excited with a maximum value of 40 mT, which corresponds to an average power loss density of 150 kW/m 3 at room temperature compared to the loss measurements on the toroidal core samples of the same material [68]. In summary, the calculated results and the results determined by the FEM simulation for the winding and core losses are listed in Table 8.…”

Section: Hf Transformer and Resonance Inductor Designmentioning

confidence: 98%

“…In Figure 20a, the p design of the inductive component is shown, including the geometric dimensions ify the aforementioned analyses and the results of the optimization strategy, a f ment method (FEM) based 3D model for the transformer and the resonance indu developed using ANSYS Maxwell. Figure 20b illustrates the FEM simulation resu maximum magnetic flux density at the nominal operating point (fsw,LLC = 1 MHz, I A, Isec = 6.5 A), which is used to calculate the core losses for the selected Fi337 mat average, the core is excited with a maximum value of 40 mT, which correspon average power loss density of 150 kW/m 3 at room temperature compared to the lo urements on the toroidal core samples of the same material [68]. In summary, th lated results and the results determined by the FEM simulation for the winding losses are listed in Table 8.…”

Section: Hf Transformer and Resonance Inductor Designmentioning

confidence: 99%

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

et al. 2022

Self Cite

View full text Add to dashboard Cite

This paper proposes a portable 11 kW off-board charger for electric vehicles. In the ac/dc stage, a three-phase power factor correction (PFC) in Vienna topology is chosen. The loss and volume of the PFC inductance are calculated over a wide range of parameters and optimized with regard to design, winding, and core material. A three-phase LLC resonant converter operating at 1 MHz is chosen for the galvanically isolated dc/dc stage. A parametrizable loss model of the high-frequency transformer and the resonance inductor is developed to minimize volume, weight, and losses. With the help of an automated algorithm using these loss models, the inductive components are optimized in terms of winding specification, magnetic material, and core geometry, verified by finite element analysis and measurements. For the ac/dc stage, 900 V SiC devices are adopted, and 1200 V SiC devices are used in the primary and secondary sides of the dc/dc stage. A variable dc-link voltage is utilized to adjust the charging profile and to operate the LLC resonant converter at the most efficient point near the series resonance frequency. A mechatronically integrated portable air-cooled off-board charger prototype with 11 kW, three-phase 400 VAC input, and 620–850 VDC output is realized and tested. The prototype demonstrates a power density of 2.3 kW/liter (37.7 W/in³), a peak efficiency of 96%, and 95.8% efficiency over the defined battery voltage range.

show abstract

“…Moreover, to verify the behavior of the magnetic flux density (B [T]) versus the magnetic field intensity (H [Am −1 ]), a ring core fabricated with the same material used in the pot cores was characterized at the Chair of Electron Devices at FAU [48]. The ring core before and after winding is shown in Fig.…”

Section: A Module Characterizationmentioning

confidence: 99%

Inductive Transcutaneous Power Transfer Design for Cardiac Assist Devices by Use of Inhomogeneous Biocompatible Core Material

Khalili¹,

Kirchner²,

Bartunik³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

Comprehensive accuracy examination of electrical power loss measurements of inductive components for frequencies up to 1 MHz

Cited by 6 publications

References 23 publications

Transcutaneous Energy Transfer System for Cardiac-Assist Devices by Use of Inhomogeneous Biocompatible Core Material

Transcutaneous Energy Transfer System for Cardiac-Assist Devices by Use of Inhomogeneous Biocompatible Core Material

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

Inductive Transcutaneous Power Transfer Design for Cardiac Assist Devices by Use of Inhomogeneous Biocompatible Core Material

Contact Info

Product

Resources

About

Comprehensive accuracy examination of electrical power loss measurements of inductive components for frequencies up to 1 MHz

Cited by 6 publications

References 23 publications

Transcutaneous Energy Transfer System for Cardiac-Assist Devices by Use of Inhomogeneous Biocompatible Core Material

Transcutaneous Energy Transfer System for Cardiac-Assist Devices by Use of Inhomogeneous Biocompatible Core Material

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

Inductive Transcutaneous Power Transfer Design for Cardiac Assist Devices by Use of Inhomogeneous Biocompatible Core Material

Contact Info

Product

Resources

About

Comprehensive accuracy examination of electrical power loss measurements of inductive components for frequencies up to 1 MHz