Magnetics Business & Technology - Summer 2018 - 20

RESEARCH & DEVELOPMENT
When a common mode choke is being designed to act as a circuit filter in the circuit, it attenuates the energy down to a given
frequency, which reduces the unwanted noise entering the load.
The choke then produces a large inductance, and filters out the
common mode noise only, but allow the differential mode signal to
pass through the filter. See Fig. 9

Z=R+jX
Calculating,

Z=√(R2+X2 )
When AC passes through a component that contains reactance,
energy might be stored and released in the form of a magnetic
field, in which case the reactance is inductive; or energy might be
stored and released in the form of an electric field, in which case
the reactance is capacitive.[4]

Z=√(R2+(XL-XC)2 )
Fig. 9 Common Mode Filter

When the net reactance is inductive only,

IV.

Xc=0

IMPEDANCE

Impedance is the AC equivalent to a concept of resistance in DC;
it is comprehensive expression in forms of opposition to electron
flow, including both resistance and reactance. It is present in all
circuits, and in all components. The reactance could be inductive
or capacitive. When alternating current goes through impedance,
a voltage drop is produced that is somewhere between 0o and 90o
out of phase with the current. Impedance is mathematically symbolized by the letter "Z" and is measured in the unit of ohms (Ω);[3]
it is in complex form of resistance R plus reactance jX.

20

Magnetics Business & Technology * Summer 2018

where

then

Z=√(R2+XL2 )

XL =2πfL and Z becomes the inductive impedance.

Table 1 - Different Winding Comparison
Table 1 shows a few different winding techniques as single-layer,
multi-layer and cross winding. All of them are using round copper wire
with diameter of 0.8mm and wound with 22 turns. They have similar
inductance, DCR and parasitic capacitance. But the single-layer shows
the lowest leakage inductance with higher self resonant frequency
(SRF). Cross winding also shows high SRF, but this technique is hard
to wind and not compatible with machine winding as well.

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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
Magnetics Business & Technology - Summer 2018 - 25
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Magnetics Business & Technology - Summer 2018 - Product News
Magnetics Business & Technology - Summer 2018 - 29
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
Magnetics Business & Technology - Summer 2018 - Cover4
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