Magnetics Business & Technology - Summer 2018 - 21

RESEARCH & DEVELOPMENT
V.

IMPEDANCE COMPARISON

The following are some comparison between different
winding techniques, different winding location, and round
wire/flat wire common mode choke with comparison of the
traditional T-Core and rectangular flat wire common mode
choke. Let's see if there is any performance change in between.

Table 2 - Diferent Location Comparison

Fig. 10 Impedance Curves I
From the impedance vs frequency curve in Fig. 10, it shows
that the single-layer and cross winding have similar results,
both of them are better than the multi-layer, and single-layer has lower leakage inductance and is machine windable,
which cross winding is not.

Fig. 12 Impedance Curves II

Fig. 11 Different Location Winding
Now let's see with a rectangular core body if winding in different locations affects performance. The coils were wound
on the longer side vs the shorter side of the rectangular
core body as the picture shows in Fig. 11.
From the electrical result in Table 2, with the same round
wire of 0.4mm diameter and wind 48 turns, the short side
winding gives a higher leakage inductance and is more difficult to wind compared to long-side winding.

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The impedance comparison curves in Fig. 12 show both
long-side winding and short-side winding have a very similar result, and the short side winding actually comes out
with a little higher SRF. But it also gives a higher leakage
inductance.
Now let's compare the round wire and flat wire with two
identical rectangular core bodies and see if there is any difference.
Continued on Page 14...

Summer 2018 * Magnetics Business & Technology

21


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Table of Contents for the Digital Edition of Magnetics Business & Technology - Summer 2018

Magnetics Business & Technology - Summer 2018
Contents
Editor’s Choice
Magnetic Nanoparticles Leap from Lab Bench to Breast Cancer Clinical Trials
Safran, a Major Player in Plasma Propulsion, Finds Booming Market for its Hall Eff ect Thrusters
NASA Develops Hall-Eff ect Electric Propulsion to Thrust Exploration on into Deep Space
Airbus-built SES-12 Dual-mission Satellite Successfully Launched
Research & Development
Case Study
Product News
Industry News
Marketplace/ Advertising Index
Spontaneous Thoughts: Dysprosium 2.0
Magnetics Business & Technology - Summer 2018 - Magnetics Business & Technology - Summer 2018
Magnetics Business & Technology - Summer 2018 - Cover2
Magnetics Business & Technology - Summer 2018 - Contents
Magnetics Business & Technology - Summer 2018 - Editor’s Choice
Magnetics Business & Technology - Summer 2018 - 5
Magnetics Business & Technology - Summer 2018 - Magnetic Nanoparticles Leap from Lab Bench to Breast Cancer Clinical Trials
Magnetics Business & Technology - Summer 2018 - 7
Magnetics Business & Technology - Summer 2018 - Safran, a Major Player in Plasma Propulsion, Finds Booming Market for its Hall Eff ect Thrusters
Magnetics Business & Technology - Summer 2018 - 9
Magnetics Business & Technology - Summer 2018 - NASA Develops Hall-Eff ect Electric Propulsion to Thrust Exploration on into Deep Space
Magnetics Business & Technology - Summer 2018 - 11
Magnetics Business & Technology - Summer 2018 - Airbus-built SES-12 Dual-mission Satellite Successfully Launched
Magnetics Business & Technology - Summer 2018 - 13
Magnetics Business & Technology - Summer 2018 - Research & Development
Magnetics Business & Technology - Summer 2018 - 15
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Magnetics Business & Technology - Summer 2018 - Case Study
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Magnetics Business & Technology - Summer 2018 - Product News
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Magnetics Business & Technology - Summer 2018 - Industry News
Magnetics Business & Technology - Summer 2018 - 31
Magnetics Business & Technology - Summer 2018 - Marketplace/ Advertising Index
Magnetics Business & Technology - Summer 2018 - 33
Magnetics Business & Technology - Summer 2018 - Spontaneous Thoughts: Dysprosium 2.0
Magnetics Business & Technology - Summer 2018 - Cover3
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