By : George Orenchak TSC Ferrite International · Soft Ferrite Advantages, Capabilities & Markets...

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Soft Ferrite Advantages, Capabilities & Markets 1997 Soft Ferrite Users Conference By : George Orenchak TSC Ferrite International
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Transcript of By : George Orenchak TSC Ferrite International · Soft Ferrite Advantages, Capabilities & Markets...

  • Soft Ferrite Advantages, Capabilities & Markets 1997 Soft Ferrite Users Conference

    By : George Orenchak TSC Ferrite International

    http://www.docudesk.com

  • Soft Ferrite Advantages, Capabilities & Markets Slide 1

    Soft Ferrite is the general term to a class of ceramic, electromagnetic materials ν They have a homogeneous cubic spinel

    crystalline structure ν Are composed of iron oxide with divalent

    metal oxides ν MnZnFe2O4 or NiZnFe2O4

  • Soft Ferrite Advantages, Capabilities & Markets Slide 2

    Advantages of Soft Ferrite ν High Resistivity = low eddy current loss = high usable

    frequency ranges ν High Magnetic Permeability = high induction in minimal

    space ν Versatility of core shapes = satisfies magnetic

    requirements in minimal space ν Light Density = light weight ν Low Cost Relative to Alternative Materials

  • Soft Ferrite Advantages, Capabilities & Markets Slide 3

    NiZn Ferrite are best for > 2 MHz

    MnZn Ferrite are best for 20 KHz to 2 MHz

    80% NiFe is best for 2 KHz to 20 KHz

    50% NiFe is best for 300 Hz to 2 KHz

    3% SiFe is best < 300 Hz

    10 100 1000 10000 100000 1000000 10000000100

    1000

    10000

    100000

    Frequency (Hz)

    Pe

    rfo

    rma

    nce

    Fa

    cto

    r (T

    es

    la H

    ert

    z)

    3%SiFe 50%NiFe 80%NiFe MnZn Ferrite NiZn Ferrite

    Core MaterialsPerformance Factor vs. Kilohertz

  • Soft Ferrite Advantages, Capabilities & Markets Slide 4

    MnZn NiZn

    Volume Resistivity ρρρρ ΩΩΩΩcm

    50 to 100 1x105 to 5x109

    Permeability µµµµ 1,000 to 15,000 10 to

    1,000 Saturation Flux Density Bm

    Gauss 3,000 to 5,000 2,000

    to 3,500

    Useful frequency Range MHz Up To 10

    Up To 100

    Density G/cm3 4.8 4.9

    Some Important Properties

  • Soft Ferrite Advantages, Capabilities & Markets Slide 5

    Core Loss - A measure of the efficiency of a material at high levels of magnetizing force. Dissipated energy in the form of heat.

    Core loss vs. Temperature25kH, 2000 gauss

    0102030405060708090

    100110120130140

    20 40 60 80 100 120

    Temperature in Centigrade

    mW/cc

    TSF-5080 TSF-7070 TSF-8040

    • Core size is often constrained by temperature rise that results from core loss

    • A number of material grades have been designed so that their minimum core loss occurs at specific Temperatures.

  • Soft Ferrite Advantages, Capabilities & Markets Slide 6

    Saturation Flux Density - The value of magnetic flux density at saturation. A materials maximum magnetic induction.

    B = (Erms)(108) / (4.44)(f)(N)(Ae) Saturation Flux Density vs. Temperature

    TSF-7070 material15 oersteds

    Temperature in Centigrade

    Flu

    x D

    ensi

    ty (

    gau

    ss)

    0

    1000

    2000

    3000

    4000

    5000

    6000

    -30 -10 10 30 50 70 90 110 130 150 170 190 210 230 250

    • Core size is often constrained by Saturation Flux Density • Saturation Flux Density decreases with increasing temperature. Often a material's Saturation Flux Density is a constraint on the minimum core size. f = frequency N= turns Ae = effective core area

  • Soft Ferrite Advantages, Capabilities & Markets Slide 7

    Ferrite Material Constants Specific Heat 0.25 cal / g / °°°°c Thermal Conductivity 10 x 10-3 cal / sec / cm / °°°°c Coefficient of Linear Expansion

    8 to 10 x 10-6 / °°°°c

    Compressive Strength 60 x 103 lbs / in2 Young’s Modulus 18 x 103 lbs / in2 Hardness (Knoop) 650 Density 4.6 to 4.8 gm / cm3 •••• Ferrites are poor thermal conductors, are strong in compression but weak in tension

  • Soft Ferrite Advantages, Capabilities & Markets Slide 8

    Common Core Configurations

    B A

    C

    B

    F E

    D

    A

    C

    A

    B

    F E

    D

    C

    A

    B

    F E

    D

    C B

    F E

    D

    A

    C

    K

    Toroid E core ETD core EC core EFD core

    A

    BC

    D

    F E

    K

    C

    F EGA

    D

    B B

    D

    HFJ

    E

    AG

    C

    C HF

    B

    DG

    A

    E A HF

    B

    D

    G

    C

    E

    EP core PQ core RM core Pot core DS core

    A

    B

    E

    D

    C B

    F E

    D

    A

    C

    D

    B

    A

    C

    U core Planar E core Planar I core

  • Soft Ferrite Advantages, Capabilities & Markets Slide 9

    Applications using Ferrites

    ν Inductors Inductance is the electrical circuit property that opposes change in current due to a magnetic field

    ν Transformers Devices that transform electric energy from one circuit to another by electromagnetic induction

    ν Noise Suppression Reduction of unwanted high frequency electrical disturbance

    ν Deflection Yokes for CRT & Video Displays Electromagnet for deflecting (directing) electron beams

  • Soft Ferrite Advantages, Capabilities & Markets Slide 10

    Transformer Applications ν Impedance Matching Transformer ν Isolation Transformer ν Current Transformer ν Voltage Transformer ν Wide Band Transformer ν Pulse Transformer ν Switching Power (Output/Inverter) Transformer

    ν Flyback Transformer ν Forward Transformer ν Push-Pull Transformer ν Half-Bridge Transformer ν Full-Bridge Transformer

  • Soft Ferrite Advantages, Capabilities & Markets Slide 11

  • Soft Ferrite Advantages, Capabilities & Markets Slide 12

  • Soft Ferrite Advantages, Capabilities & Markets Slide 13

    Inductor Applications

    νFilter Inductor νCommon Mode Inductor νDifferential Mode Inductor

    νPower Inductor νResonant Inductor νBoost Inductor νOutput Choke Inductor

  • Soft Ferrite Advantages, Capabilities & Markets Slide 14

    Inductance - Electrical property that opposes any change in current because of a magnetic field. L = ((.004) (ππππ) (N2) (Ae) (106)) / Le (in Henries)

    • Material Permeability, core dimensions & number of turns all affect inductance and therefor affect component size

    Ae = effective cross sectional area

    Le = effective magnetic path length

    N = turns on coil.

  • Soft Ferrite Advantages, Capabilities & Markets Slide 15

    ν Telecommunications Markets

    ν System Networks ν Integrated System Digital Networks

    (ISDN) ν Modems ν Cell Phones & Pagers

  • Soft Ferrite Advantages, Capabilities & Markets Slide 16

    Power Supply Markets

    ν Computers (Notebook to Mainframe) ν Medical Equipment ν Test Equipment

  • Soft Ferrite Advantages, Capabilities & Markets Slide 17

    Fluorescent Lighting Ballast Markets ν Commercial, Industrial & Institutional

    Lighting ν Compact Florescent Lamps ν Controllable Lighting ν Emergency Lighting

  • Soft Ferrite Advantages, Capabilities & Markets Slide 18

    Automotive Markets ν HID Head Lamps ν Neon Stop Lights ν Battery Chargers for Electric

    Vehicles ν Sensors

  • Soft Ferrite Advantages, Capabilities & Markets Slide 19

    Consumer Electronics

    ν Conventional Television ν Digital & High Definition Television ν VCR ν Stereo & Radio