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Optimization of the Geometry of Iron...

Whitehead, Christopher J.

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Optimization of the Geometry of Iron Alloy Planar Inductor Cores for SMPS.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Optimization of the Geometry of Iron Alloy Planar Inductor Cores for SMPS./
作者:	Whitehead, Christopher J.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	67 p.
附註:	Source: Masters Abstracts International, Volume: 81-09.
Contained By:	Masters Abstracts International81-09.
標題:	Electrical engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27664536
ISBN:	9781392574331

Optimization of the Geometry of Iron Alloy Planar Inductor Cores for SMPS.
Whitehead, Christopher J.

Optimization of the Geometry of Iron Alloy Planar Inductor Cores for SMPS. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 67 p.

Source: Masters Abstracts International, Volume: 81-09.

Thesis (M.S.Eng.)--University of Massachusetts Lowell, 2020.

This item must not be sold to any third party vendors.

Planar inductors are widely used in high performance switched-mode power supplies (SMPS). New manufacturing techniques now enable complex planar magnetic cores to be made from iron alloys, rather than just ferrite. Iron alloy cores offer several advantages over ferrite. However, they are being designed with geometries that were optimum for ferrite, which do not necessarily take full advantage of the soft-saturation of iron alloy materials. Specifically, these cores are being designed primarily with uniform cross-sectional areas.This thesis investigates whether a non-uniform cross-sectional area may allow for an increase in inductance per square turn (AL value) and/or available space for copper windings, without compromising the saturation performance, or increasing the overall footprint of the inductor. Increasing the AL value of the inductor can result in reduced ripple current and switching losses. An increased winding window allows for wider copper traces and reduced DC resistance. Both of these translate to improved overall efficiency when used properly in an SMPS. Increased efficiency leads to a reduction in energy costs and cooling requirements.For the experiment, three sets of sample cores were machined from Chang Sung 60μ High Flux material. The first sample set (Control Sample Set 1) has a near-uniform cross-sectional area, which will be used as the experimental control sample set. Each of the two experimental sample sets has a non-uniform cross-sectional area. One of these sample sets (Experimental Sample Set 2) has a moderately non-uniform cross-sectional area and is optimized for increased AL value. The final experimental sample set (Experimental Sample Set 3) also has a highly non-uniform cross-sectional area and is optimized for an increased winding window and reduced DC loss. The DC bias characteristics for each set were measured and an additional "short circuit" test measures their performance by simulating a fault at the output of a SMPS. All three sample sets have near-identical PCB footprints.In the DC bias tests, all sample sets showed similar results for the initial onset of saturation; however, their behavior differed slightly once saturation began. In the short circuit test, the sample set with the highly non-uniform cross-sectional area exhibited a somewhat hard saturation, more in line with the acute saturation behavior of ferrite. The sample set with moderately non-uniform cross-sectional area actually performed better than the control set at controlling the current during a short circuit fault. This was due to its higher initial inductance.The results show that for cores made from High Flux, a non-uniform cross-sectional area can not only increase operating efficiency and reduce ripple current, but can even improve short-circuit resilience in SMPS.

ISBN: 9781392574331Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

High flux

Optimization of the Geometry of Iron Alloy Planar Inductor Cores for SMPS.
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500 $a Source: Masters Abstracts International, Volume: 81-09.
500 $a Advisor: Mil'Shtein, Samson.
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520 $a Planar inductors are widely used in high performance switched-mode power supplies (SMPS). New manufacturing techniques now enable complex planar magnetic cores to be made from iron alloys, rather than just ferrite. Iron alloy cores offer several advantages over ferrite. However, they are being designed with geometries that were optimum for ferrite, which do not necessarily take full advantage of the soft-saturation of iron alloy materials. Specifically, these cores are being designed primarily with uniform cross-sectional areas.This thesis investigates whether a non-uniform cross-sectional area may allow for an increase in inductance per square turn (AL value) and/or available space for copper windings, without compromising the saturation performance, or increasing the overall footprint of the inductor. Increasing the AL value of the inductor can result in reduced ripple current and switching losses. An increased winding window allows for wider copper traces and reduced DC resistance. Both of these translate to improved overall efficiency when used properly in an SMPS. Increased efficiency leads to a reduction in energy costs and cooling requirements.For the experiment, three sets of sample cores were machined from Chang Sung 60μ High Flux material. The first sample set (Control Sample Set 1) has a near-uniform cross-sectional area, which will be used as the experimental control sample set. Each of the two experimental sample sets has a non-uniform cross-sectional area. One of these sample sets (Experimental Sample Set 2) has a moderately non-uniform cross-sectional area and is optimized for increased AL value. The final experimental sample set (Experimental Sample Set 3) also has a highly non-uniform cross-sectional area and is optimized for an increased winding window and reduced DC loss. The DC bias characteristics for each set were measured and an additional "short circuit" test measures their performance by simulating a fault at the output of a SMPS. All three sample sets have near-identical PCB footprints.In the DC bias tests, all sample sets showed similar results for the initial onset of saturation; however, their behavior differed slightly once saturation began. In the short circuit test, the sample set with the highly non-uniform cross-sectional area exhibited a somewhat hard saturation, more in line with the acute saturation behavior of ferrite. The sample set with moderately non-uniform cross-sectional area actually performed better than the control set at controlling the current during a short circuit fault. This was due to its higher initial inductance.The results show that for cores made from High Flux, a non-uniform cross-sectional area can not only increase operating efficiency and reduce ripple current, but can even improve short-circuit resilience in SMPS.
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