NANOPERM - Design Considerations for advanced EMI filter chokes

Transcription

1 NANOPERM - Design Considerations for advanced EMI filter chokes May 26th 2004 PCIM, Nuremberg Fritz Rauscher MAGNETEC GmbH, Booth 525 in Hall 12 MAGNETEC GmbH 05/2004/ra 1/15

2 Content of presentation Nanocrystalline material NANOPERM Current compensated chokes Comparison Nanocrystalline and Ferrite core chokes MAGNETEC GmbH 05/2004/ra 2/15

3 Material properties of NANOPERM Alloy composition Fe 73,5 Cu 1 Nb 3 Si 15,5 B 7 Saturation flux density B sat 1,2 T Permeability levels µ Saturation magnetostriction λ s < 0,5 ppm Specific electrical resistivity σ 115 µωcm Density γ 7,35 g/cm³ Curie temperature T c ~ 600 C Max. operational temperature T max ~ 120 C (180 C) Core losses (0,3T, 100kHz, sine) P v < 110 W/kg Tape thickness d 17 / 23 µm MAGNETEC GmbH 05/2004/ra 3/15

4 Choice 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) = A L * n 2 with A L = µ 0 * µ r (f) * A fe / l f Z(f) = 2π * f * n 2 * µ 0 * µ r (f) * A fe / l fe n: number of turns µ r : permeability A fe : Iron cross section MAGNETEC GmbH 05/2004/ra 4/15

5 Basic circuitry of a EMI mains filter L L 230V mains N C x N load PE L C y C y C x : X-capacitor, L: Current compensated choke, C y : Y-capacitor MAGNETEC GmbH 05/2004/ra 5/15

6 Principle of a CM choke 1-phase version H load = 0 RF current H RF 0 load current 3-phase version MAGNETEC GmbH 05/2004/ra 6/15

7 Benefits of NANOPERM products High insertion losses Small build volume Low earth leakage currents High working temperature Best value for the money MAGNETEC GmbH 05/2004/ra 7/15

8 Comparison Ferrite - NANOPERM Ferrite NANOPERM Permeability (@100kHz) Saturation flux density B sat 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! MAGNETEC GmbH 05/2004/ra 8/15

9 Permeability as a function of temperature 10kHz / 3mA/cm NANOPERM Ferrite Max. Max. for for Ferrite: Ferrite: about about 120 C 120 C T [ C] MAGNETEC GmbH 05/2004/ra 9/15

10 Saturation flux density as a function of temperature Saturation flux density Bsat [T] 1,4 1,2 1 0,8 0,6 0,4 0,2 NANOPERM Ferrite T38 Max. Max. for for Ferrite: Ferrite: about about 120 C 120 C N T [ C] MAGNETEC GmbH 05/2004/ra 10/15

11 Better impedance with same core Attenuation level [db] NANOPERM Ferrite geometries Improved attenuation below below khz khz Core geometry: Ø 30mm, 22 turns 0 0,01 0, Frequency f (MHz) MAGNETEC GmbH 05/2004/ra 11/15

12 Same impedance at smaller volume 20 Impedance Z [kω] Volume reduction > 50% 50% NANOPERM = 40 mm Ferrite = 63 mm f [khz] MAGNETEC GmbH 05/2004/ra 12/15

13 Build volume - real example NANOPERM choke I N =3 60 C L N = 3 x 10kHz m = 120g Volume reduction 60% Weight reduction 65% Ferrite choke I N = 3 x 40 C L N = 3 x 10kHz m = 350g 59 mm 73 mm 25 mm 39 mm MAGNETEC GmbH 05/2004/ra 13/15

14 Available products - cores & chokes Tape wound cores from mm 1-phase EMC chokes up to I = 2 x 60A 100 mm 3-phase EMC chokes up to I = 3 x 200A MAGNETEC GmbH 05/2004/ra 14/15

15 Thank you for your attention! Come and visit us at booth 525! MAGNETEC GmbH 05/2004/ra 15/15