A Low-Loss Inductor Structure and Design Guidelines for High-Frequency Applications

Yang, Rachel S.; Hanson, Alex J.; Reese, B.; Sullivan, Charles R.; Perreault, David J.

doi:10.1109/tpel.2019.2892397

Cited by 59 publications

(19 citation statements)

References 25 publications

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“…3c) was selected. In fact, the efficiency of the converter can be further improved by using well-design inductors that provide Qfactors as large as 1000 [12]. Another important point about the high step-up operation is that, because of a large duty cycle values, the difference between fSW and the resonance frequency (fRES) becomes large, so the inductor should provide a high Q-factor for two very different frequencies (fSW and fRES).…”

Section: Design Aspects and Experimental Resultsmentioning

confidence: 99%

“…Considering several datasheets of commercial inductors, it can be seen that within a same family, the Isat drops as the value of L increases, so that sat 2 remains almost constant. Therefore, the value of L is not critical by itself, however, an inductor design providing higher saturation current at a constant inductance (either by employing ferrite materials with higher magnetic permeability or by increasing the effective core crosssection) is beneficial [12], [13]. The selected inductor in this work has a large Isat ~ 20 A, however, due to the core losses, the charging and discharging becomes inefficient after about 5-A, corresponding to Eind = 125 µJ.…”

Section: Design Aspects and Experimental Resultsmentioning

confidence: 99%

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Efficient High Step-Up Operation in Boost Converters Based on Impulse Rectification

Nikoo

Jafari

Perera

et al. 2020

IEEE Trans. Power Electron.

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Conventional boost converters, while having a high level of simplicity and robustness, are known to have a poor efficiency at high step-up regime. More complicated topologies have been extensively explored to increase the step-up ratio while keeping a high-efficiency, however, an efficient regulated dc-dc power conversion at high step-up regime still remains a challenge. In this work we demonstrate fully soft-switched operation of boost converters based on impulse rectification, which results in an efficient power conversion at very high step-up regime. Contrary to the conventional analysis of boost converters which seeks to minimize conduction and switching losses, our approach considers reactive power as the key parameter limiting efficiency. A theoretical basis for this operation mode enabled an appropriate design resulting in power conversion efficiencies above 90% for voltage gain values of 5, 10, 25, and 50, with a peak efficiency of 97%. The guidelines to design boost converters based on the proposed approach are discussed. The simplicity and high performance of this approach opens new avenues in designing regulated dc-dc converters with a high step-up.

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Section: Design Aspects and Experimental Resultsmentioning

confidence: 99%

Section: Design Aspects and Experimental Resultsmentioning

confidence: 99%

Efficient High Step-Up Operation in Boost Converters Based on Impulse Rectification

Nikoo

Jafari

Perera

et al. 2020

IEEE Trans. Power Electron.

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“…In addition, the prototype highlights the potential offered by advanced magnetic materials [14] and design [18] when operated at high frequency. Converter performance may be improved further with refinements to wide-bandgap switch technology, which limits both the operating frequency and efficiency through C oss and R DS,on .…”

Section: Discussionmentioning

confidence: 99%

“…The PFC converter was implemented in a hardware prototype utilizing GaN FETs, SiC diodes and advanced high frequency magnetics [18] (Table I). The design operates with dynamic frequency variation in the 2-4 MHz range, approximately 10x that of conventional PFC systems, with commensurate reductions in passive component values.…”

Section: Implementation Detailsmentioning

confidence: 99%

“…The advantage of the ground-referenced controls is substantial, however, and we use this approach in this prototype. The inductor was implemented with a high-frequency structure (see [18] for details) using Fair-Rite 67, a magnetic material appropriate to the frequency range [14]. The prototype thus served as a platform to explore both the proposed topology and the magnetic structure in [18].…”

Section: Implementation Detailsmentioning

confidence: 99%

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A high frequency power factor correction converter with soft switching

Hanson

Perreault

2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Power factor correction (PFC) converters are typically operated at low frequency to mitigate switching losses and to simplify control; this in turn requires large passive components. Soft switching techniques could permit higher frequency operation, but most soft-switched converters do not maintain high performance across the wide voltage and power ranges required for PFC applications. Here we present a PFC converter which enables high frequency operation by maintaining soft switching and by using a control scheme which requires no current sensing. These advantages are verified with a prototype which achieves power factors above 0.996 (THD < 10 %) while maintaining ZVS across voltage and power for efficiencies ∼ 97 %. By using increased switching frequency (∼ 10x over conventional designs), this converter can take advantage of greatly reduced passive component values for power conversion and EMI filtering.

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Flexible Mini‐Inductors with Ultra‐High Inductance Density Directly Cut from Soft Magnetic Amorphous Alloys by Femtosecond Laser

Chen,

Zhang,

Wang

et al. 2024

Adv Funct Materials

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Inductors are indispensable parts in power modules of electronic devices. With the rapid development of flexible and wearable electronic devices, developing flexible micro‐inductors with large energy storage has become an urgent task. In this research, a sophisticated femtosecond laser ablation technique is employed to craft circular spiral mini‐inductors via selective etching of soft magnetic amorphous alloy ribbons. Remarkably, while these inductors possess dimensions akin to human fingerprints, they demonstrate an impressively elevated inductance value of ≈1.15 µH at 1 MHz. The inductance density is ≈280–390 nH mm−2, which is ≈10 times larger than conventional circular spiral inductors and is attributed to the high permeability of the amorphous alloys. Furthermore, the inductors showcase commendable flexibility, marked by stellar elasticity and a bending endurance exceeding 2500 cycles, thanks to the amorphous alloys' superior elastic strain limit. When integrated with an LM2576‐3.3BT buck converter, the fabricated inductor achieved a peak power conversion efficiency nearing 70%. These findings underscore the potential of such flexible mini‐inductors in the landscape of flexible electronics.

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A Low-Loss Inductor Structure and Design Guidelines for High-Frequency Applications

Cited by 59 publications

References 25 publications

Efficient High Step-Up Operation in Boost Converters Based on Impulse Rectification

Efficient High Step-Up Operation in Boost Converters Based on Impulse Rectification

A high frequency power factor correction converter with soft switching

Flexible Mini‐Inductors with Ultra‐High Inductance Density Directly Cut from Soft Magnetic Amorphous Alloys by Femtosecond Laser

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