New high permeability materials for EMI suppression
leticia.leon@ferroxcube.com
February 2011
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Contents
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High permeability materials evolution
What is improved?
What is new in 3E10 & 3E12?
3E10
3E12
Standard range in 3E10 &3E12
Applications
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High permeability materials evolution
Permeability
12000
3E12
10000
3E5/6
Tighter tolerance
7000
3E26
6000
3E25/3E27
4300
3C11
3E10
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What is improved in the common mode filter ?
Higher permeability
Increase coupling between windings
 the differential mode impedance is decreased
Reduce the size of the toroid and/or the number of turns of winding
 less DC resistance
 cheaper BOM cost
Larger bandwidth
Extended dumping bandwidth
Lower electric losses
Better frequency stability
Lower signal distortion
Tighter inductance tolerances
Less variation due to external stresses from winding and potting
Better predictability
 More robust process and improved repeatiblity
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Tighter
tolerance
(±20%)
3E6
20% Higher
permeability
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3E10: Process control with extended bandwidth
Tighter tolerance in AL
Lower electric losses
More stability with frequency
Impedance Vs Frequency
Impedance (Ω)
30
3E6
25
Property
3E10
Permeability
10000 ± 20%
tan δ/μi @ 30
kHz, 25ºC, 0.25mT
< 5x 10-6
tan δ/μi @ 100kHz,
25ºC, 0.25mT
< 20 x 10-6
3E10
20
15
We can observe that despite 3E6 higher initial
permeability , from 300 kHz upwards, thanks to 3E10
better stability with frequency, extended impedance
bandwidth and higher amplitude are achieved
10
5
100
1000
Frequency (kHz)
Measured on a coated toroid of Ø25xØ15xh10
10000
Less influence of winding and potting operations on permeability
Broad damping characteristics
Better process control thanks to the improvement in impedance stability
with frequency and tolerance reduction
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3E12: 20% permeability rise
Permeability in product increases up to
20% compared to 3E6 and market
equivalents
Property
Permeability
3E12
12000 ± 30%
Reduction of negative impact of high number of turns like DC
resistance and parasitic capacitance
Higher permeability leads to core size or number of turns reduction
 Cost savings either in ferrite material or in copper
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3E10 & 3E12 performance overview
Impedance Vs Frequency 3E10 and 3E12
Impedance Vs Frequency
30Graphs
600
show how impedance vary 3E12
as aachieves the
highest impedance
function of number of turns
Impedance (Ω)
25
In all cases we observe similar
in 3E10 and 3E12: 3E12 higher Z at lower
15frequencies, whereas lower electric
losses of 3E12 lead to wider bandwidth
10with high impedance in 3E10
20
3E6
3E10
Impedance (Ω)
up
500
to 300kHz
3E10 achieves the most
behavior
extensive widthband 400
300
200
100
3E12
3 turns 3E10
0
100
5
100
1000
Frequency (kHz)
10000
5 turns 3E10
5 turns 3E12
1000
10000
Frequency (kHz)
Impedance Vs Frequency 3E10 and 3E12
Impedance Vs Frequency 3E10 and 3E12
18000
3000
15000
Impedance (Ω)
2500
Impedance (Ω)
3 turns 3E12
2000
1500
1000
12000
9000
6000
3000
3E10 10 turns
3E12 10 turns
3E10 25 turns
500
3E12 25 turns
0
100
1000
10000
100
Frequency (kHz)
1000
Frequency (kHz)
10000
Measured on coated toroids of Ø25xØ15xh10
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Range in 3E10 & 3E12
Standard cores in 3E10 and 3E12 are
all toroid´s tools from 2.5mm to
63mm
Rings are the optimal shape in high permeability to
reduce leakage losses
Gapped shapes reduce effective permeability, therefore the
advantages obtained for these shapes in 3E10 and 3E12
materials are negligible
However, shapes can be manufactured in these materials upon
request
Samples available
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Applications
The main applications are interference suppression and wideband
transformers:
Wideband transformers  Impedance transformation over a broad
frequency range. Applications include impedance matching, voltage or
current transformation, DC isolation, balanced/unbalanced mixing,
power splitting, coupling, and signal inversion. Telecommunications
devices
Pulse transformers  Communication systems and digital networks
Ground fault interruptors (GFI)  Home and industrial
Interference suppression  Common mode choke. Mains filters in all
type of electronic equipment.
ATTENTION TO HIGH GROWTH INVERTERS MARKET!!!!!!!
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Summary
Property
Property
3E6
Permeability
10000 ± 30%
tan δ/μi @ 30 kHz,
25ºC, 0.25mT
< 10x 10-6
tan δ/μi @ 100kHz,
25ºC, 0.25mT
< 30 x
10-6
Resistivity
0.1 Ohm x m
3E10
Permeability
10000 ± 20%
tan δ/μi @ 30 kHz,
25ºC, 0.25mT
< 5x 10-6
tan δ/μi @ 100kHz,
< 20 x 10-6
25ºC, 0.25mT
Resistivity
Property
0.5 Ohm x m
3E12
Permeability
12000 ± 30%
tan δ/μi @ 30 kHz,
25ºC, 0.25mT
< 7x 10-6
tan δ/μi @ 100kHz,
25ºC, 0.25mT
< 25 x 10-6
Resistivity
0.5 Ohm x m
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Benchmarking
Looking at competitors’ highest permeability products we find…
Asian 2
Asian 1
American
Permeability 10000
Permeability 12000
Permeability
10000
Tolerance
±30%
Tolerance
±30%
Tolerance
±30%
Max size
Electric losses
63
7
Max size
65
Max size
38
Electric losses
30
Electric losses
10
Ferroxcube
3E10
Ferroxcube
3E12
FXC offers the tightest
tolerance in high permeability
12000
10000
12000
Permeability
Taking
all these
factors into
account, itthe
islargest
difficult
to the
find
size with
maximum
permeability
in the
market
±20%
±30%
Tolerancesuch high
±20% quality product
Max size
63
63
Electric losses
55
77
and the lowest electric losses
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