Programming instructions

Basic Components

Multisim Component Reference Guide 2-26 ni.com

Advanced Inductor Model Overview

The advanced inductor model includes both non-ideal AC and DC effects. The simplified

subcircuit for the inductor has the following model:

The actual inductor model includes a dependent voltage source that is proportional to the

derivative of the current, I

. See “Advanced Inductor Model Implementation” on page 2-28

for a more detailed implementation overview.

A discussion of the model’s parameters follows.

The AC aspect of the model simulates the capacitive behavior of the inductor. A parallel

capacitance, Cp, is inserted in parallel to model this effect. The parallel combination of the

inductor and capacitor create a resonant frequency defined by:

This quantity is specified in datasheets and is entered in the

Inductor Self Resonant Frequency

field.

Magnetic loss, which dampens the resonant peak, is modeled with a parallel resistor, Rp. The

relationship between Rp and the inductor quality factor Q, is:

ComponentRef.book Page 26 Thursday, December 7, 2006 10:12 AM