期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 34, 期 10, 页码 9993-10005出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2892397
关键词
Distributed gap; high frequency (HF); inductors; magnetics; skin effect
资金
- National Science Foundation [1609240, 1610719]
- Analog Devices through the MIT SuperUROP program
- Masdar Institute of Science and Technology, Abu Dhabi, UAE
- Massachusetts Institute of Technology
- Carl W. Hoffman (1980) and Elizabeth B. Klerman (1982) Fund
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1610719] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1609240] Funding Source: National Science Foundation
Operation in the high-frequency (HF) regime (3-30 MHz) has potential for miniaturizing power electronics, but designing small efficient inductors at HF can be challenging. At these frequencies, losses due to skin and proximity effects are difficult to reduce, and gaps needed to keep B fields low in the core add fringing field loss. We propose a low-loss inductor structure with step-by-step design guidelines for HF applications. The structure achieves low loss through double-sided conduction in its single-layer winding and through quasi-distributed gaps. An example similar to 15 mu H inductor designed using the proposed design guidelines achieved an experimental quality factor of 720 at 3 MHz and 2A (peak) of ac current. The inductor also improved a high-current-swing power converter operated at 1-3 MHz; at 250 W, the inductor reduced converter losses by 19%, compared to a conventional inductor design. In some cases, litz wire may further improve the performance of the proposed structure. With litz wire, the example inductor had an improved quality factor of 980. Thus, the proposed inductor geometry and design guidelines are suitable for small highly efficient inductors at HF and can thereby help realize high-frequency miniaturization of power electronics. (This paper is accompanied by an example Python script for generating preliminary designs, available in the online supplementary material.)
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