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RL Circuit with matlab

  1. Aug 28, 2005 #1
    I have analysed a RL circuit with freewheelind diode, switch and additional source. I have used ode solver which is called ode45 in matlab. This expression is [t, i]=ode45('inducwithE', tspan, i0'). There is three stages in that circuit and every last 'i' (current-this is the state variable) value for the previous stage becomes initial value for the following stages. But when I am using if statement for three different conditions I am always referring the expression ([t, i]=ode45('inducwithE', tspan, i0')). In that point 'i' becomes always '0'. How can I assing those initial values for second and third stages? Could anyone help me about it???
    Thanks

    function dcrl = inducwithE(t,i)
    % function for RL circuit calculations
    Vs=50;
    E=30;
    L=0.1;
    R=1;
    Z=E/L;
    X = (Vs/L)-Z;
    Y = i*R/L;
    if t<0.7;
    dcrl = X - Y;VT=Vs;
    else 0.7<t<0.75;
    dcrl=-Z-Y;
    end
    if t>0.75;
    dcrl=Z-Y;
    end
    if t>1.4
    dcrl = X - Y;
    end

    tspan=[0 2];
    i0=0;
    [t, i]=ode45('inducwithE',tspan,i0')
     
  2. jcsd
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