Hi all,

I'm working with a simple behavioral model of a boost converter. I'm trying to model the ripple based on the equations given by the theory. I use the idtmod function to create a sort of ripple on the waveform, defined by the frequency of operation and the ripple current. However, whenever I try to pass the modulus of idtmod as a parameter obtained in the initial_step the simulation never ends  :-/. It's weird 'cause the operand works properly with the same parameters. What can I do to properly pass modulus of the idtmod calculated in the initial_step ?

Here is the code  :)

//

`include "discipline.h"
`include "constants.h"

module stepup (out, in, gnd);

electrical out, in, gnd;

parameter real D=0.14 from (0:1);
parameter real L=100e-6; // Converter inductance
parameter real f=100e3; // Converter frequency (if fixed)
parameter real Rw=0.1;

real Rload, Irppl, Iripple, Vripple, WLss, WLosses, T, Vrppl;

analog begin

       //CALCULATING REAL PARAMETERS

       @(initial_step) begin
       Irppl = abs((V(in,gnd)*(1-(V(out,gnd)/V(in,gnd)))/(f*L)));
       Iripple = 1000*Irppl;
       Rload = abs(V(out,gnd)/I(out));
       Vrppl = Irppl*Rload;
       Vripple = Iripple*Rload;
       WLss = abs(Rw*pow(I(out),2));
       WLosses = 1000*WLss;
       end

       // INPUT-OUTPUT VOLTAGE RELATION
                    // IDEAL CONVERTER * WINDING LOSSES FACTOR + RIPPLE
       V(out,gnd) <+ V(in,gnd)*(1/(1-D))*(1+((Rw*I(out)/(pow(1-D,2)*V(out,gnd)))));
       V(out,gnd) <+ idtmod(f*Irppl,0,Vrppl,-20e-3)*Rload; // <<< THE PROBLEM IS Vrppl <<<

       // INPUT-OUTPUT CURRENT RELATION
       I(in) <+ I(out)/(1-D);
//DISPLAY MEASUREMENT RESULTS ON OUTPUT LOG
       @(final_step) begin
       $strobe("The total winding losses are %g [mW]", WLosses);
       $strobe("The ripple current is %g [mA]", Iripple);
       $strobe("The ripple voltage is %g [mV]", Vripple);
       end
end

endmodule