UM1561 datasheet(29/39 Pages) STMICROELECTRONICS

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UM1561

Digital closed loop control and diagnostic functions implemented

Doc ID 023556 Rev 1

29/39

The ExecControlInitParamOffset() calculates the offset value of the I/O variables, in

particular the DC-components (DC_PanelVoltage, the DC_PanelCurrent) and the AC-

components (AC_LineVoltage, AC_LineCurrent).

The offset values are calculated reading the I/O information for a fixed time (5 seconds). It is

done to achieve the accuracy of the AC values. No manual calibration is needed.

void ExecControlInitParamOffSet()

{

DataSensing_sum.DC_PanelVoltage += (u16)(DataSensingIO.DC_PanelVoltage);

DataSensing_sum.DC_PanelCurrent += (u16)(DataSensingIO.DC_PanelCurrent);

DataSensing_sum.AC_LineVoltage += (u16)(DataSensingIO.AC_LineVoltage);

DataSensing_sum.AC_LineCurrent += (u16)(DataSensingIO.AC_LineCurrent);

if (DataInitCount < (MAX_DATA_INIT_COUNT-1))

DataInitCount++;

else if(DataInitCount==(MAX_DATA_INIT_COUNT-1))

{

((vu16*)&DataSensingOffSet)[0] = DataSensing_sum.AC_LineCurrent /

(DataInitCount+1);

((vu16*)&DataSensingOffSet)[1] = DataSensing_sum.AC_LineVoltage /

(DataInitCount+1);

((vu16*)&DataSensingOffSet)[2] = DataSensing_sum.DC_PanelCurrent /

(DataInitCount+1);

((vu16*)&DataSensingOffSet)[3] = DataSensing_sum.DC_PanelVoltage /

(DataInitCount+1);

DataInitCount++;

}

where:

●

if (DataInitCount < (MAX_DATA_INIT_COUNT-1)) is (Time for offset

estimation (5 seconds)).

The firmware is based on state machines architecture able to indicate the real operation of

the power board for each instant.

switch (State_Control)

{

case STOPPING:

sprintf(strLineMessage, "STOPPING");

break;

case STOP:

sprintf(strLineMessage, "STOP");

break;

case START:

sprintf(strLineMessage, "START");

break;

case BUS_FAULT:

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