ferrite modeling & b-h curve

ACME Electronics Corporation 1

Ferrite Modeling&

B-H Curve

In PSPICE Simulation

By Ray Lai, FAEJune 2015


Ferrite Modeling in PSPICE

Spice is the analog electronic simulation tool widely used with robust standardized algorithm.

PSpice is a GUI enhanced version of Spice.

Magnetic device can be modeled in Pspice to simulation the real

PSpice supports two models of magnetic core:

1. Jiles-Atherton model (level 2) Introduced here

2. Spice Plus model (level 3)


1. Ferrite Modeling in PSPICEJiles-Atherton model (level 2)* It’s CGS unit adopted for magnetics in PSPICE.


1. Ferrite Modeling in PSPICEJiles-Atherton model (level 2) Pspice Model Editor can create the Jiles-Atherton model parameters from keying the B-H values in the “Hysteresis Curve” field.


1. Ferrite Modeling in PSPICE -Jiles-Atherton model Creating new core model in Pspice Model Editor: Select new model


Default Screen:

1. Ferrite Modeling in PSPICE -Jiles-Atherton model

Key in B-H in CGS


Starting from this point, the most

out contour.

P45 　 1 2 3 4 5 6 7 8 9 10 11 12 13H 0.003 0.126 0.258 0.389 0.507 0.632 0.889 1.155 1.311 1.552 2.541 6.297 11.310 B 1381.222 1713.681 2303.000 2650.228 3165.231 3995.817 4176.271 4399.884 4538.124 4626.909 4713.623 4836.233 5097.846 　　　　　　　　　　　　　　　 14 15 16 17 18 19 20 21 22 23 24 25　H 14.861 11.330 6.698 2.578 1.562 1.286 0.874 0.635 0.514 0.381 0.245 0.167 　B 4827.064 4613.079 4458.153 4135.160 3763.493 3350.161 2539.568 955.908 472.083 272.562 77.408 -15.318 　




Select Tools Extract Parameters after keying in the B-H data



B-H curve scree will change to the corresponding data after parameter extracted



m i will affect the magnetic parameters in this model



NiZn Material needs higher X-axing setting to be able to model correctly



P45 ui=3100

P45 ui=2500

However, the B-H curve will not change much



H(K1)*1000/(4*pi)

0 20 40 60 80 100 120 140 160 180 200B(K1)/10000 B(K2)/10000

0

200m

400m

500m

P41 for m i=2400 (green) and 2000 (red)


1. Ferrite Modeling is PSPICE -Jiles-Atherton model

P41 (green) and P45 (red) @100kHz



P45 B-H at 25℃ (green) and 100℃ (red)



Good accuracy of Jiles-Atherton model.

Too bad there is no temperature coefficients



P4



P48


1. Ferrite Modeling in PSPICE -Jiles-Atherton model Gap behavior is well simulated by J-A model, too.

GAP=0.5mm

Gap=0.01mm

Gap=0.05mm


1. Ferrite Modeling in PSPICE

P45 by Spice Plus Model (level 3)



Spice Plus Model for magnetic core is greatly simplified.



Jiles-Atherton model (red) is a better approach than Spice Plus (green)


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ferrite modeling & b-h curve

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