有没有current mode flyback pwm veriloga model ?

andy2000a

有没有current mode pwm veriloga model ?

一般
使用
sot236  flyback pwm

Fb
gate
cs
protectvdd
gnd

find OTHER PWM MODEL


//  PWMswCM.va - current mode PWM switch CCM-DCM auto-togggling // //
***************************************
//  Owner    : Nicolas Cyr
//  E-mail    : nicolas.cyr@onsemi.com
// ***************************************
//
// Using Christophe Basso's model from his book "Switch-Mode Power //
Supplies" (McGraw-Hill, 2008); based on Dr. Vatch?Vorp廨ian //
initial concept developped in 1986 at Virginia Polytech Institute //
(in "Simplified Analysis of PWM Converters Using the Model of the //
PWM Switch", Transactions on Aerospace and Electronics Systems, //
vol. 26, no. 3, May 1990).
//
// ***************************************
//  Revision history
//
//    2008 Jan 23 - Nico Cyr - creation
//  2009 August 25th - correction on the CS line reported by James
Kohout // //
*****************************************************************
// Modifications by RK, Feb 2012
//  - added dependency on simulation type for Cs calculation via
initial_step //  - Ri to internal Rii to limit>0 for div operations //
*****************************************************************

`include "constants.vams"
`include "disciplines.vams"



module PWMswCM(a, c, p, Verr, DC, Mode);

inout a;    electrical a;            // "active" terminal
inout c;    electrical c;            // "common" terminal
inout p;    electrical p;            // "passive" terminal

input Verr;    electrical Verr;        // "error voltage" input

output DC;    electrical DC;            // "duty cycle" input
output Mode;    electrical Mode;        // "mode of operation" output
                        // (1 for DCM, 0 for CCM)

parameter real L=75u from (0:inf);        // inductance value
parameter real Fsw=100k from (0:inf);        // switching frequency
parameter real Ri=1 from (-inf:inf);        // sense resistor
parameter real Sa=0 from [0:inf);        // slope of compensation ramp
parameter real DCmax=0.99 from (0:1);        // duty cycle max clamp
parameter real DCmin=0.016 from (0Cmax);    // duty cycle min clamp


real d_1, d1cl, d1clh, d_2, d2cl, d2clh, Cs, mode, Iverr, Imju, Ics,
Rii; integer simtype;

Analog begin
   
              @(initial_step("ac","stb")) begin
      simtype = 0;
    end
   
    @(initial_step("tran","dc")) begin
     simtype = 1;
    end
   
    @(initial_step) begin
                 Rii = Ri;   
     if( Ri<= 0.0) begin
     Rii = 1.0e-6;
     $strobe("\nRi NULL AND THEREFORE BOUNDED TO 1uOhm !!!");
     end
    end

    // calculate and clamp duty cycle d2
    // (which corresponds to OFF time in CCM, and to demagnetization time
in DCM)

    d_2 = (2*L*Fsw*I(p,c) / ((V(DC)*V(a,c))+1u)) - V(DC);               
    d2clh = (d_2>= (1-V(DC))) ? (1-V(DC)) : d_2;
    d2cl = (d2clh<= DCmin) ? DCmin : d2clh;
        
    // calculate and clamp ON-time duty cycle d1

    d_1 = d2cl*V(c,p) / (V(a,p)-V(c,p)+1u);                        
    d1clh = (d_1>= DCmax) ? DCmax : d_1;
    d1cl = (d1clh<= DCmin) ? DCmin : d1clh;
        
    // evaluate mode of operation (1=DCM, 0=CCM)

    mode = (d2cl<(1-d1cl)) ? 1 : 0;                           

    // calculate capacitor for subharmonic oscilllations in AC simulation
(0 if DCM or Tran)

    Cs = (mode==1 || simtype==1) ? 0 : 4 / (L*4*pow(`M_PI,2)*pow(Fsw,2));        

    // calculate contributors to Ic current

    Iverr = V(Verr) / Rii;
    Imju  = Sa*d1cl/(Rii*Fsw) + V(c,p)*d2cl*( 1-((d1cl+d2cl)/2))/(L*Fsw);        
    Ics   = Cs*ddt(V(c,p));
   
   
    // assign values to currents and voltages
   
    I(a,p)<+ I(p,c)*d1cl / (d1cl+d2cl+1u);                        
    I(p,c)<+ Iverr - Imju - Ics;                           
   
    // Assign values to outputs

    V(DC)<+ d1cl;
    V(Mode)<+ mode;
   
end

endmodule