AN2388 datasheet(48/54 Pages) STMICROELECTRONICS

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Software design

AN2388

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again expressed in PU quantities, so they may be implemented in 1.15 format by the DSP

software library provided with the entire code.

Inside the SVPWM module it is necessary to estimate the 3 reference voltages to

discriminate the right place (Sector) where to place the proper space vector.

This is done using the Calc_Ref routine,:

************************************************************************************

**************************Reference Voltages calculation*

Vref1 = Vbeta

Vref2 = (Vbeta+Sqrt(3)*Valfa)/2*

Vref3 = (-Vbeta-Sqrt(3)*Valfa)/2*

************************************************************************************

***********************

void Calc_Ref(void)

{

qVref1 = qVbeta;

mul_q15_q15_q31(qSqrtd2,qValfa,&qVref2_tmp1);

mul_q15_q15_q31(q0dot5,qVbeta,&qVref2_tmp2);

qVref2_1=(short)(qVref2_tmp1>>16);

qVref2_2=(short)(qVref2_tmp2>>16);

qVref2=(qVref2_1-qVref2_2);

mul_q15_q15_q31(qSqrtd2,qValfa,&qVref3_tmp1);

mul_q15_q15_q31(q0dot5,qVbeta,&qVref3_tmp2);

qVref3_1=(short)(qVref3_tmp1>>16);

qVref3_2=(short)(qVref3_tmp2>>16);

qVref3 = (-qVref3_1-qVref3_2);

************************************************************************************

**************************End Routine

************************************************************************************

*************************

The conversions of the inputs necessary for the SVPWM module, to the required numerical

format:

Vdc

inverse

Vdc

DCbus

3408

325

400

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