I'd like to do a rainstorm ideas about how to control a Buck Converter as battery charger in order to avoid that it get down into saturation or cut-off mode, can any of the specialist in control present in this webpage give me some ideas?.
The graph is attached in matlab file.
this is the algorithm used P&O
function dc = PyO( V, I, Adc, dcinit)
%#codegen
% Isc=input ('I=');
% Voc=input('V=');
% Adc=3e-4; %variation of duty cycle
persistent dcold Vold Pold Iold
dataType = 'double';
if isempty(Vold)
Vold=0;
Iold=0;
Pold=0;
dcold=dcinit;
end
% dc= dcinit;
P= V*I;
dP=P-Pold;
dV=V-Vold;
dcmax=0.99;
dcmin=0.01;
%
if dP == 0
dc=dcold;
return
else
if dP>0
if dV>0
dc = dcold + Adc; %increase V
else
dc = dcold - Adc; %desincrease V
end
end
if dV>0
dc = dcold - Adc;
else
dc = dcold + Adc;
end
end
if dc>=dcmax || dc=dcmax || dc
Dear Sir,
It is basically very simple: To avoid saturation, measure the current through the inductor, and if it exceeds a certain treshold, switch off the MOS, and keep it off for some minimum time.
Regards
Henri.
Thanks for your answer Sir, but swicth off the MOSFET is not so easy when you have to produce quite much energy, what do you think if i implement the system DC-DC buck in cascade?
Hello,
I think to control the chopper well and protect the battery it is necessary to control the voltage of it by fixing a reference voltage with an external loop and the regulator of this voltage will generate the reference of the current that traverses the inductance. This current must be controlled by an internal loop. In any case try to maintain SOC state of charge between 10 .... 90 percent.
GOOG luck
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