motor ware 例程 pwm输出函数 怎么理解？

static inline void HAL_writePwmData(HAL_Handle handle,HAL_PwmData_t *pPwmData)
{
  uint_least8_t cnt;
  HAL_Obj *obj = (HAL_Obj *)handle;
  PWM_Obj *pwm;
  _iq period;
  _iq pwmData_neg;
  _iq pwmData_sat;
  _iq pwmData_sat_dc;
  _iq value;
  uint16_t value_sat;

  for(cnt=0;cnt<3;cnt++)
    {
      pwm = (PWM_Obj *)obj->pwmHandle[cnt];
      period = (_iq)pwm->TBPRD;
      pwmData_neg = _IQmpy(pPwmData->Tabc.value[cnt],_IQ(-1.0));
      pwmData_sat = _IQsat(pwmData_neg,_IQ(0.5),_IQ(-0.5));    //_IQsat(A, long P, long N)//IQ数值的限幅函数 把A限制到[N P]之间
      pwmData_sat_dc = pwmData_sat + _IQ(0.5);
      value = _IQmpy(pwmData_sat_dc, period);
      value_sat = (uint16_t)_IQsat(value, period, _IQ(0.0));

      // write the PWM data
      PWM_write_CmpA(obj->pwmHandle[cnt],value_sat);
    }

  return;
} // end of HAL_writePwmData() function

这个函数能不能讲解一下？

Johnson Chen1：

简单老说，计算的相电压位_IQ(-0.5)到_IQ(0.5),输出电压为50%占空比对于0电压，因此需要先将其转换成PWM输出占空比_IQ(0)到_IQ(1.0)

static inline void HAL_writePwmData(HAL_Handle handle,HAL_PwmData_t *pPwmData)
{
  uint_least8_t cnt;
  HAL_Obj *obj = (HAL_Obj *)handle;
  PWM_Obj *pwm;
  _iq period;
  _iq pwmData_neg;
  _iq pwmData_sat;
  _iq pwmData_sat_dc;
  _iq value;
  uint16_t value_sat;

  for(cnt=0;cnt<3;cnt++)
    {
      pwm = (PWM_Obj *)obj->pwmHandle[cnt];
      period = (_iq)pwm->TBPRD;
      pwmData_neg = _IQmpy(pPwmData->Tabc.value[cnt],_IQ(-1.0));
      pwmData_sat = _IQsat(pwmData_neg,_IQ(0.5),_IQ(-0.5));    //_IQsat(A, long P, long N)//IQ数值的限幅函数 把A限制到[N P]之间
      pwmData_sat_dc = pwmData_sat + _IQ(0.5);
      value = _IQmpy(pwmData_sat_dc, period);
      value_sat = (uint16_t)_IQsat(value, period, _IQ(0.0));

      // write the PWM data
      PWM_write_CmpA(obj->pwmHandle[cnt],value_sat);
    }

  return;
} // end of HAL_writePwmData() function

这个函数能不能讲解一下？

user1303469：

回复 Johnson Chen1:

还是不太明白，为什么先乘 -1   

static inline void HAL_writePwmData(HAL_Handle handle,HAL_PwmData_t *pPwmData)
{
  uint_least8_t cnt;
  HAL_Obj *obj = (HAL_Obj *)handle;
  PWM_Obj *pwm;
  _iq period;
  _iq pwmData_neg;
  _iq pwmData_sat;
  _iq pwmData_sat_dc;
  _iq value;
  uint16_t value_sat;

  for(cnt=0;cnt<3;cnt++)
    {
      pwm = (PWM_Obj *)obj->pwmHandle[cnt];
      period = (_iq)pwm->TBPRD;
      pwmData_neg = _IQmpy(pPwmData->Tabc.value[cnt],_IQ(-1.0));
      pwmData_sat = _IQsat(pwmData_neg,_IQ(0.5),_IQ(-0.5));    //_IQsat(A, long P, long N)//IQ数值的限幅函数 把A限制到[N P]之间
      pwmData_sat_dc = pwmData_sat + _IQ(0.5);
      value = _IQmpy(pwmData_sat_dc, period);
      value_sat = (uint16_t)_IQsat(value, period, _IQ(0.0));

      // write the PWM data
      PWM_write_CmpA(obj->pwmHandle[cnt],value_sat);
    }

  return;
} // end of HAL_writePwmData() function

这个函数能不能讲解一下？

user5947112：

回复 Johnson Chen1:

您好，此占空比是由 电压标幺值直接计算出来的，但是电压标幺值是由实际电压除上USER_IQ_FULL_SCALE_VOLTAGE_V得到的，而占空比直接相关的是母线电压，母线电压比USER_IQ_FULL_SCALE_VOLTAGE_V要小很多，所以直接把电压标幺值作为占空比，不会导致输出电压要小于实际所需电压吗