Programming instructions

Advanced Inductor
 National Instruments Corporation 2-27 Multisim Component Reference Guide
The inductor quality factor is also available in datasheets and is entered in the Inductor
Quality Factor
field.
DC
The DC aspect of the model includes a series DC resistance, and a non-linear inductor whose
inductance varies with current.
The DC resistance is the winding material resistance and is specified on the datasheet. It is
entered in the
Inductor Series Resistance field.
The non-linear inductance models the core’s saturation using a second order polynomial. The
polynomial coefficient is set such that when the inductor current reaches the rated current
(Idc), the inductance has dropped to 90% of its nominal value, Lo. Both the nominal
inductance and rated current can be found on the datasheet and are entered into the
Nominal
Inductance
and Inductor Rated Current fields. The inductance value is clipped when it reaches
10% of the nominal value, to prevent the value from becoming negative.
I
L
Lo
Lo1.0
Lo9.0
Idc
Idc3
ComponentRef.book Page 27 Thursday, December 7, 2006 10:12 AM