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From: SACHIN DEVASSY on 24 Feb 2010 23:35
Hi

Can someiine give help regarding generation of sine stream for frequency response estimation of dc-dc converter which has switching frequency 50khz. What should be the solver step size and sample time set in power gui.

Thanks
From: Kamil on 5 Mar 2010 10:05
Hello Sachin,

I suppose you have Simulink Control Design then you can put input output points for linearisation. Then you have to go Tool -> Control Design -> and Linear analysis. Then you have to press buttom Generate Matlab code and then you can put something like below:

function sys = mylinearizemodel
% MYLINEARIZE Linearize the Simulink model - Project.
%
% SYS = MYLINEARIZE linearizes the Simulink model Project using
% the operating point defined by the model initial conditions.

% M-File generated by MATLAB(R) 7.9 and Simulink Control Design (TM) 3.0.
%
% Generated on: 03-Mar-2010 21:58:40

%% Specify the model name
model = 'Project';

%% Create the linearization I/O as specified in Project
ios(2) = linio('Project/Flowmeter',2,'out');
ios(1) = linio('Project/Sine Wave',1,'in');

in = frest.Sinestream('Frequency',[2*pi*0.1:2*pi*0.1:2*pi*2],'Amplitude',1,'SamplesPerPeriod',40,'NumPeriods',10,'SettlingPeriods',2)

[sys,simout] = frestimate(model,ios,in);
bode(sys)
grid on
frest.simView(simout,in,sys);

And after just press run. Be careful with the name of your model in my case was 'Project'. I hope it will help you.

Ps: I have many problems with linearisation more complicated system. It does not works correctly with linearize either frestimate function. I am trying to find explanations why I cannot get stable response. I did the same manually and I get completely different solutions. Well, if you will know something more just post here solutions.

Kamil

"SACHIN DEVASSY" <sachindevassy(a)gmail.com> wrote in message <hm4um7$sqh$1(a)fred.mathworks.com>...
> Hi
>
> Can someiine give help regarding generation of sine stream for frequency response estimation of dc-dc converter which has switching frequency 50khz. What should be the solver step size and sample time set in power gui.
>
> Thanks
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