Analytical Expressions for Inductances of 3-D Air-Core Inductors for Integrated Power Supply

Shetty, Chandra; Kandeel, Youssef; Ye, Liang; O’Driscoll, Séamus; McCloskey, Paul; Duffy, Maeve; O’Mathuna, Cian

doi:10.1109/jestpe.2021.3077203

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…These results show good agreement (<10%) with the calculation models presented in Section IV. However, a more accurate analytical model may be required for higher frequencies, as in [32]. Single-and two-phase versions of spiral and solenoid inductors were designed for comparison as described in Section II.…”

Section: Pcb Inductor Implementationmentioning

confidence: 99%

Optimum Phase Count in a 5.4-W Multiphase Buck Converter Based on Output Filter Component Energies

Kandeel

O’Driscoll

O’Mathuna

et al. 2023

IEEE Trans. Power Electron.

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This article presents an analysis of low-power, multiphase interleaved buck converters to illustrate the extent to which adding more phases is beneficial for reducing the passive components' sizes. The analysis focuses on a typical converter application with a wide operating duty cycle range and requires good load transient. It is shown that by restricting the phase current ripple, the theoretical reduction in total inductor peak energy predicted for increased phase numbers is limited. The article assesses the benefit of inductor coupling and presents guidelines for coupling factor selection to avoid steady-state inductance roll-off over the wide input voltage range. Standard printed circuit board (PCB) manufacturing design rules are shown to place a practical phase count limit considering the reduction in total inductor size. PCB integrated, air-core solenoid and spiral inductors are implemented in both single-and two-phase 5.4 W, 20 MHz buck converter prototypes. When compared with single-phase designs, two-phase spiral inductors are 44% smaller, and the two-phase solenoid has a 54% lower loss. The two-phase prototype converter achieves better overall efficiency and peaks at almost 90% at V IN = 4.5 V, V OUT = 1.8 V, and F SW = 20 MHz.

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Section: Pcb Inductor Implementationmentioning

confidence: 99%

Optimum Phase Count in a 5.4-W Multiphase Buck Converter Based on Output Filter Component Energies

Kandeel

O’Driscoll

O’Mathuna

et al. 2023

IEEE Trans. Power Electron.

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“…25. To simplify the process of analytical modelling, the windings are assumed to be completely closed, and each winding is excited separately [59]. The current direction in all windings is the same: either clockwise or anticlockwise.…”

Section: B Series Inductance Of the Windingmentioning

confidence: 99%

Design, Modeling, and Analysis of a 3-D Spiral Inductor With Magnetic Thin-Films for PwrSoC/PwrSiP DC-DC Converters

Shetty

Smallwood

2022

IEEE Access

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“…Toroidal inductors, transformers, and current transformers are widely used in industry [1,2]. And toroidal inductors are used in key components of power electronics, such as supercapacitorassisted surge absorbers [3], filters [4], and various types of converters in circuits [5].…”

Section: Introductionmentioning

confidence: 99%

Analytical modelling of high‐frequency losses in toroidal inductors

Zhao

Ming

Han

2023

IET Power Electronics

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Toroidal inductors are widely used in power electronic systems. With the increasing switching frequency of power devices, the AC losses of high‐frequency inductor windings have become an issue that cannot be ignored in design. A method with low computational time cost and high accuracy is urgently needed by designers. This paper proposes a modified analytical method for winding loss calculation of toroidal inductors based on the one‐dimensional Dowell method and the two‐dimensional Ferreira method, and proposes a compensated analytical model considering the proximity effect of inter‐turn conductors of toroidal windings. The analytical method calculates the non‐linear porosity of toroidal windings, and can accurately solve the AC losses of toroidal inductors with arbitrary porosity winding encapsulation. The analytical results are in good agreement with the finite element method (FEM) and experimental data. The experimental measurement data verifies the validity of the proposed model within 1‐MHz frequency, the calculation error of the modified analytical method is less than 25%, and the calculation error of the compensated analytical model is reduced to 10%.

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Analytical Expressions for Inductances of 3-D Air-Core Inductors for Integrated Power Supply

Cited by 8 publications

References 28 publications

Optimum Phase Count in a 5.4-W Multiphase Buck Converter Based on Output Filter Component Energies

Optimum Phase Count in a 5.4-W Multiphase Buck Converter Based on Output Filter Component Energies

Design, Modeling, and Analysis of a 3-D Spiral Inductor With Magnetic Thin-Films for PwrSoC/PwrSiP DC-DC Converters

Analytical modelling of high‐frequency losses in toroidal inductors

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