magnet-technologie nanoperm for advanced emi filter chokes · • comparison nanocrystalline and...

Considearations about softmagnetic material for EMI filter chokes

MAGNET-TECHNOLOGIEMAGNETEC

© MAGNETEC GmbH www.magnetec.de 05/2004/ra 1/15

NANOPERMNANOPERM®® -- Design Considerations Design Considerations for advanced EMI filter chokesfor advanced EMI filter chokes

May 26th 2004PCIM, Nuremberg

Fritz RauscherMAGNETEC GmbH, Booth 525 in Hall 12




Content of presentationContent of presentation

• Nanocrystalline material NANOPERM®• Current compensated chokes• Comparison Nanocrystalline and Ferrite

core chokes




Material properties of NANOPERMMaterial properties of NANOPERM®®

Alloy composition Fe73,5 Cu1 Nb3 Si15,5 B7

Saturation flux density Bsat 1,2 TPermeability levels µ 20.000 - 200.000Saturation magnetostriction λs < 0,5 ppmSpecific electrical resistivity σ 115 µΩcmDensity γ 7,35 g/cm³Curie temperature Tc ~ 600 °CMax. operational temperature Tmax ~ 120 °C (180°C)Core losses (0,3T, 100kHz, sine) Pv < 110 W/kgTape thickness d 17 / 23 µm




Choice of softmagnetic materialChoice of softmagnetic material

Main requirement on a EMC filter choke:

High impedance Z(f), f = 150kHz to 30MHz

Z(f) = ω * L(f) = 2π * f * L(f)

L(f) = AL* n2 with AL = µ0 * µr(f) * Afe / lf

Z(f) = 2π * f * n2 * µ0 * µr(f) * Afe / lfe

n: number of turns µr : permeability Afe : Iron cross section




Basic circuitry of a EMI mains filterBasic circuitry of a EMI mains filter

Cx: X-capacitor, L: Current compensated choke, Cy: Y-capacitor

230Vmains

loadCx

CyL

L

N

PE Cy

L´

N´




Principle of a CM chokePrinciple of a CM choke

1-phase version

3-phase versionload current

RF current

Hload = 0

HRF ≠ 0

load currentload current

RF currentRF current

Hload = 0Hload = 0

HRF ≠ 0HRF ≠ 0




Benefits of NANOPERM productsBenefits of NANOPERM products

•• High insertion lossesHigh insertion losses•• Small build volumeSmall build volume•• Low earth leakage currentsLow earth leakage currents•• High working temperatureHigh working temperature•• Best value for the moneyBest value for the money




Comparison Ferrite Comparison Ferrite -- NANOPERMNANOPERM®®

Ferrite NANOPERM®

Permeability (@100kHz) 10.000 – 12.000 20.000 – 30.000

Saturation flux density Bsat 400 mT 1180 mT

Curie temperature Tc ~ 130 °C ~ 600 °C

Max. working temperature 95 °C 120 °C (180 °C)

Relative cost 1 ~ 2

NANOPERM: ⇒ Advanced, smaller and lighter components!




Permeability as a function of Permeability as a function of temperaturetemperature

0

10.000

20.000

30.000

40.000

50.000

50 100T [°C]

Perm

eabi

lity

@ 1

0kH

z / 3

mA

/cm

0 150

NANOPERM

Ferrite

Max. for Ferrite:

about 120°C

Max. for Ferrite:

about 120°C




Saturation flux density as a function Saturation flux density as a function of temperatureof temperature

0

0,2

0,4

0,6

0,8

1

1,2

1,4

0 100 200 300T [°C]

Satu

ratio

n flu

x de

nsity

Bsa

t [T]

400

Max. for Ferrite:

about 120°C

Max. for Ferrite:

about 120°CFerrite

N67T38

NANOPERM




Better impedance with same core Better impedance with same core geometriesgeometries

0

10

20

30

40

50

60

0,01 0,1 1 10 100

Frequency f (MHz)

Atte

nuat

ion

leve

l [dB

]

Ferrite

NANOPERM

Improved attenuation

below 400 kHz

Improved attenuation

below 400 kHz

Core geometry:Ø 30mm, 22 turns




Same impedance at smaller volumeSame impedance at smaller volume20

10 100 f [kHz]

Impe

danc

e Z

[kΩ

]

4

12

1.000 10.000 100.000

NANOPERM∅ = 40 mm

Ferrite∅ = 63 mm

Volume reduction

> 50%

Volume reduction

> 50%

16

8




73 mm

39 mm25 mm

59 mm

Build volume Build volume -- real examplereal exampleNANOPERM® choke

IN = 3 x 25A @ 60°CLN = 3 x 1,6mH @ 10kHz

m = 120g

Ferrite chokeIN = 3 x 25A @ 40°C

LN = 3 x 1,3mH @ 10kHzm = 350g

Volume reduction 60% Weight reduction 65%




Available products Available products -- cores & chokescores & chokes

100 mm

Tape wound cores from ∅12 ... 300mm

1-phase EMC chokes up to I = 2 x 60A

3-phase EMC chokes up to I = 3 x 200A




Thank you for your attention!Thank you for your attention!

Come and visit us at Come and visit us at booth 525booth 525!!

magnet-technologie nanoperm for advanced emi filter chokes · • comparison nanocrystalline and...

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