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STPS1L60 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce STPS1L60
Description  Digital constant-current controller
PDF  34 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPS1L60 Fiches technique(HTML) 21 Page - STMicroelectronics

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AN3151
Firmware implementation
Doc ID 17051 Rev 1
21/34
{
s16 Proportional_Term, Integral_Term;
s16 Error, output_s16;
Error = (PID->Reference - Current_String_Input);
// Proportional term computation
Proportional_Term = PID->Kp_Gain * Error;
// Integral term computation
Integral_Term = PID->Ki_Gain * Error;
if ( (Integral_FirstRow >= 0) && (Integral_Term >= 0) && (PID-
>Max_PID_Output == FALSE) )
// freeze integral term in case of
over/underflow
{
if ( (s32)(Integral_FirstRow + Integral_Term) < 0)
{Integral_FirstRow = S16_MAX;
}
or else
{Integral_FirstRow += Integral_Term;
}
}
or else if ((Integral_FirstRow <= 0) && (Integral_Term <= 0) &&
(PID->Min_PID_Output == FALSE) )
{ if ( (s32)(Integral_FirstRow + Integral_Term) > 0)
{ Integral_FirstRow = -S16_MAX;
}
or else
{Integral_FirstRow += Integral_Term;
}
}
or else if ( (Integral_FirstRow <= 0) && (Integral_Term >= 0) )
{Integral_FirstRow += Integral_Term;
}
or else if ( (Integral_FirstRow >= 0) && (Integral_Term <= 0) )
{Integral_FirstRow += Integral_Term;
}



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