NDLI: On the relationship of quality factor and hollow winding structure of coreless printed spiral winding (CPSW) inductor

Content Provider	IEEE Xplore Digital Library
Author	Yipeng Su Xun Liu Chi Kwan Lee Hui, S.Y.
Copyright Year	1986
Abstract	The principle of using hollow spiral winding is not novel, but the study on this topic is far from complete. In this paper, how hollow the central region of the coreless printed spiral winding (CPSW) inductor should be for a given footprint area in order to achieve the maximal quality factor Q_max and to maintain high inductance value is explored. A hollow factor based on the ratio of the inner hollow radius and the outer winding radius τ = R_in/R_out, is proposed as for optimization and quantifying how hollow a spiral winding is. The relationship between τ and Q_max, which depends on the operating frequency and the dimensional parameters of CPSW inductor, is established. For a specific operating frequency, it is discovered that if the conductor width is comparable with the skin depth, or the conductors are placed relatively far away from each others, the hollow design of the CPSW inductor has little improvement on Q but reduces the inductance. If the conductor width is much larger than the skin depth and the conductors are closely placed, the hollow spiral design is recommended. The optimal range of τ with which the Q_max can be achieved is found to be around 0.45-0.55.
Sponsorship	IEEE Power Electronics Society
Starting Page	3050
Ending Page	3056
Page Count	7
File Size	724353
File Format	PDF
ISSN	08858993
Volume Number	27
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Windings Inductors Spirals Conductors Magnetic cores Inductance Q factor quality factor Planar magnetics
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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