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Friday, July 18, 2008

Inductor parameters - PSPICE

INDUCTOR
The symbol for a Inductor is L .The name of a Inductor must start with L, and it takes the following general form
L(name)N+ N- LNAME LVALUE IC=Vo
N+ is the positive node and N- is the negative node. The voltage of node N+ is assumed positive with respect to node N-, and the current flows from node N+ through the Inductor to node N-. LNAME is the model name, and LVALUE is the nominal value of the Inductor, IC defines the initial (time zero) current of the Inductor, Io.
If LNAME is omitted, LVALUE is the Inductance in Henrys, and the LVALUE can be positive or negative but must not be zero.

MODEL PARAMETERS FOR INDUCTORS
Name Meaning Units Default
L Inductance multiplier 1
IL1 Linear Current Co efficient Amps -1 0
IL2 Quadratic Current Co efficient Amps -2 0
TC1 Linear Temperature Co efficient °C -1 0
TC2 Quadratic Temperature Co efficient °C -2 0

IND=LVALUE * L * (1+IL1*I+IL2*I2
* [1+TC1 * (T – To) + TC2 * (T – To) 2 ]
where T is the operating temperature in degrees Celsius ,and To is the room temperature in
degrees Celsius.
Note:- L is an inductance multiplier, rather than the value of the inductance .It scales the actual inductance value .LVALUE ,thus ,L=1.1 means that LVALUE is multiplied by 1.1,not that LVALUE is 1.1H
Some Inductor statements

L1 6 5 10MH
LLOAD 12 11 5UH IC=0.2MA
LLINE 15 14 ACAP 5MH
LCHOKE 20 19 ACAP 20NF IC=0.5MA
.MODEL LMOD IND (L=1 IL1=0.1 IL2=0.002 TC1=0.02 TC2=0.005)

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