svgen.h

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#ifndef _SVGEN_H_
#define _SVGEN_H_
 
#ifdef __cplusplus
extern "C"
{
#endif
 
#include <stdint.h>
 
#ifndef IEEE754_TYPES
#define IEEE754_TYPES
typedef float   float32_t;
typedef double  float64_t;
#endif // IEEE754_TYPES
 
#define SQRT_THREE_OVER_TWO 0.8660254037844f
#define TWO_OVER_SQRT_THREE 1.15470053837926f
 
 
static __attribute__((always_inline)) 
void SVGEN_runCom(const float32_t oneOverDcBus_invV, const float32_t inValpha, const float32_t inVbeta, \
                float32_t* pVa, float32_t* pVb, float32_t* pVc)
{
    float32_t vmax_pu, vmin_pu, vcom_pu = 0;
    
    float32_t va_pu = inValpha * oneOverDcBus_invV;
    float32_t vbeta_pu = inVbeta * oneOverDcBus_invV;
 
    float32_t va_tmp = -0.5f * va_pu;
    float32_t vb_tmp = SQRT_THREE_OVER_TWO * vbeta_pu;
 
    //
    // -0.5*Valpha + sqrt(3)/2 * Vbeta
    //
    float32_t vb_pu = va_tmp + vb_tmp;
 
    //
    // -0.5*Valpha - sqrt(3)/2 * Vbeta
    //
    float32_t vc_pu = va_tmp - vb_tmp;
 
    //
    // Find Vmax and Vmin
    //
    if(va_pu > vb_pu)
    {
        vmax_pu = va_pu;
        vmin_pu = vb_pu;
    }
    else
    {
        vmax_pu = vb_pu;
        vmin_pu = va_pu;
    }
    if(vc_pu > vmax_pu)
    {
        vmax_pu = vc_pu;
    }
    else if(vc_pu < vmin_pu)
    {
        vmin_pu = vc_pu;
    }
 
    //
    // Compute Vcom = 0.5*(Vmax+Vmin)
    //
    vcom_pu = 0.5f * (vmax_pu + vmin_pu);
 
    //
    // Subtract common-mode term to achieve SV modulation
    //
    *pVa = (va_pu - vcom_pu);
    *pVb = (vb_pu - vcom_pu);
    *pVc = (vc_pu - vcom_pu);
 
}
 
static __attribute__((always_inline)) 
void SVGEN_runMax(const float32_t oneOverDcBus_invV, const float32_t inValpha, const float32_t inVbeta, \
                float32_t* pVa, float32_t* pVb, float32_t* pVc)
{
    float32_t vmax_pu = 0;
    
    float32_t va_pu = inValpha * oneOverDcBus_invV;
    float32_t vbeta_pu = inVbeta * oneOverDcBus_invV;
 
    float32_t va_tmp = -0.5f * va_pu;
    float32_t vb_tmp = SQRT_THREE_OVER_TWO * vbeta_pu;
 
    //
    // -0.5*Valpha + sqrt(3)/2 * Vbeta
    //
    float32_t vb_pu = va_tmp + vb_tmp;
 
    //
    // -0.5*Valpha - sqrt(3)/2 * Vbeta
    //
    float32_t vc_pu = va_tmp - vb_tmp;
 
    //
    // Find Vmax
    //
    if(va_pu > vb_pu)
    {
        vmax_pu = va_pu;
    }
    else
    {
        vmax_pu = vb_pu;
    }
 
    if(vc_pu > vmax_pu)
    {
        vmax_pu = vc_pu;
    }
 
    //
    // DPWM maximum modulation
    //
    *pVa = (va_pu - vmax_pu) + 0.5f;
    *pVb = (vb_pu - vmax_pu) + 0.5f;
    *pVc = (vc_pu - vmax_pu) + 0.5f;
}
 
static __attribute__((always_inline)) 
void SVGEN_runMin(const float32_t oneOverDcBus_invV, const float32_t inValpha, const float32_t inVbeta, \
                float32_t* pVa, float32_t* pVb, float32_t* pVc)
{
    float32_t vmin_pu = 0;
    
    float32_t va_pu = inValpha * oneOverDcBus_invV;
    float32_t vbeta_pu = inVbeta * oneOverDcBus_invV;
 
    float32_t va_tmp = -0.5f * va_pu;
    float32_t vb_tmp = SQRT_THREE_OVER_TWO * vbeta_pu;
 
    //
    // -0.5*Valpha + sqrt(3)/2 * Vbeta
    //
    float32_t vb_pu = va_tmp + vb_tmp;
 
    //
    // -0.5*Valpha - sqrt(3)/2 * Vbeta
    //
    float32_t vc_pu = va_tmp - vb_tmp;
 
    //
    // Find Vmin
    //
    if(va_pu < vb_pu)
    {
        vmin_pu = va_pu;
    }
    else
    {
        vmin_pu = vb_pu;
    }
 
    if(vc_pu < vmin_pu)
    {
        vmin_pu = vc_pu;
    }
 
    //
    // DPWM minimum modulation
    //
    *pVa = (va_pu - vmin_pu) - 0.5f;
    *pVb = (vb_pu - vmin_pu) - 0.5f;
    *pVc = (vc_pu - vmin_pu) - 0.5f;
}
 
static __attribute__((always_inline)) 
void SVGEN_clamp(const float32_t Umax, const float32_t Umin, \
                float32_t* pVa, float32_t* pVb, float32_t* pVc)
{
    *pVa = (*pVa > Umax) ? Umax : (*pVa < Umin) ? Umin : *pVa;
    *pVb = (*pVb > Umax) ? Umax : (*pVb < Umin) ? Umin : *pVb;
    *pVc = (*pVc > Umax) ? Umax : (*pVc < Umin) ? Umin : *pVc;
}
 
#ifdef __cplusplus
}
#endif
 
#endif // _SVGEN_H_