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svpwm.c
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/**
***********************************************************************************
* @file svpwm.c
* @author Serhii Yatsenko [[email protected]]
* @version V1.0
* @date May-2020
* @brief This file provides firmware function for implementation the SVPWM -
* Space-Vector Pulse Width Modulation for power electronics application
***********************************************************************************
* @license
*
* MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
***********************************************************************************
*/
/* Includes -----------------------------------------------------------------------*/
#include "svpwm.h"
/* Private typedef ----------------------------------------------------------------*/
/* Private define -----------------------------------------------------------------*/
#define M_Pi 3.1415926535897f // float type of Pi constant value
#define M_Pi_3 (M_Pi/3.0f)
/* Private constants --------------------------------------------------------------*/
/**
* @brief Matrix with cell indices in a time intervals table for SVPWM duty cycle
* calculation technique
*/
const uint8_t au8PermuataionMatrix[6][3] =
{
{ 1, 2, 0 },
{ 3, 1, 0 },
{ 0, 1, 2 },
{ 0, 3, 1 },
{ 2, 0, 1 },
{ 1, 0, 3 }
};
/* Private macro ------------------------------------------------------------------*/
/* Private variables --------------------------------------------------------------*/
/* Private function prototypes ----------------------------------------------------*/
/* Private functions --------------------------------------------------------------*/
/**
* @brief SVPWM calculation function. This function calculates three values of
* duty cycle to generate a three-phase voltage vector with amplitude -
* ptSVPWM->fUs and angle - ptSVPWM->fAngRad.
* @param ptSVPWM: pointer to user data structure with type "tSVPWM".
* @retval None
*/
void tSVPWM_calc(tSVPWM* ptSVPWM)
{
uint8_t u8Sector;
float fMaxUs, fScaledUs, fBeta, fTb1, fTb2, afTi[4];
fMaxUs = ptSVPWM->fUdc * (1.0f/sqrtf(3.0f));
switch(ptSVPWM->enInType)
{
case AlBe:
ptSVPWM->fUs = hypotf(ptSVPWM->fUbe, ptSVPWM->fUal);
ptSVPWM->fAngRad = atan2f(ptSVPWM->fUbe, ptSVPWM->fUal);
break;
case UsAng:
ptSVPWM->fUs = fabsf(ptSVPWM->fUs);
break;
default: return;
}
if(ptSVPWM->fUs > fMaxUs) ptSVPWM->fUs = fMaxUs;
fScaledUs = ptSVPWM->fUs/fMaxUs;
ptSVPWM->fAngRad += M_Pi;
u8Sector = (uint8_t)(ptSVPWM->fAngRad * (1.0f/M_Pi_3));
fBeta = ptSVPWM->fAngRad - M_Pi_3 * u8Sector;
fTb1 = fScaledUs * sinf(M_Pi_3 - fBeta);
fTb2 = fScaledUs * sinf(fBeta);
afTi[0] = (1.0f - fTb1 - fTb2)*0.5f;
afTi[1] = fTb1 + fTb2 + afTi[0];
afTi[2] = fTb2 + afTi[0];
afTi[3] = fTb1 + afTi[0];
ptSVPWM->fCCRA = ptSVPWM->fUdcCCRval * afTi[au8PermuataionMatrix[u8Sector][0]];
ptSVPWM->fCCRB = ptSVPWM->fUdcCCRval * afTi[au8PermuataionMatrix[u8Sector][1]];
ptSVPWM->fCCRC = ptSVPWM->fUdcCCRval * afTi[au8PermuataionMatrix[u8Sector][2]];
}
/*********************************** END OF FILE ***********************************/