some example about the FOC dead-time compensation？my mcu is s12ZVML128，andI setPMFCCTL_ISENS = 0x10;

[Clarkhe]

hi。

i have some questions about the dead-time compensation？my mcu is s12ZVML128，

I tried the current zero crossing detection compensation and register detection compensation method, the effect is not good, request help, thank you

Thanks!

void pmf_init(void)
{
PMFCFG2_REV0 = 1; // 01 PWM generator A generates reload event.
PMFCFG2_REV1 = 0;

PMFMODA = 2500; // pwm frequency to be 20 kHz
PMFDTMA = MOS_DEAD_TIME; // dead time of pmf to be 0.75 us

PMFCCTL_ISENS = 0x10; // 死区补偿方法

PMFVAL0 = PMFMODA >> 1; // set the output duty to be 50%
PMFVAL2 = PMFMODA >> 1;
PMFVAL4 = PMFMODA >> 1;

PMFENCA_LDOKA = 1; // apply PMF Modulo value

PMFICCTL_PECx = 0x7; // Enable Double Switching
PMFCINV = 0x15;

PMFCFG2_MSK = 0x3F; // Disable PWM at the output

PMFENCA_PWMENA = 1; // Enable PWM

PMFENCA_PWMRIEA = 1; // Reload Interrupt - Used for sampling period generation

PMFENCA_GLDOKA = 1; // 0 = Local LDOKA controls buffered registers / 1 = external Load OK controls buffered registers
PMFFQCA_LDFQA = 1; // Reload every TWO PWM, 10KHZ,page588
}

[pachamatej]

Hello,

I believe there is a mistake in the assignment:

---

PMFCCTL_ISENS = 0x10; // assigning hex number of 0x10, leading to 0b000010000 being assigned to two-bit fieldIf you

If your intention is to use mode 10 (Current status sample correction on inputs IS0, IS1, and IS2 during deadtime), please use

---

PMFCCTL_ISENS = 0b10;

or

---

PMFCCTL_ISENS = 0x02;

or

---

PMFCCTL = 0x20;

instead.

Let me know if it works for you.

Best regards,

Matej

[Clarkhe]

/* 死区补偿 -寄存器换向标志位检测换向 */
if(PMFDTMS_DT0 == 0)//正电流
{
f16pwm->f16Arg1 = MLIB_AddSat_F16(f16pwm->f16Arg1, DeadTime_H);
}
if(PMFDTMS_DT1 == 1)//负电流
{
f16pwm->f16Arg1 = MLIB_SubSat_F16(f16pwm->f16Arg1, DeadTime_L);
}
if(PMFDTMS_DT2 == 0)//正电流
{
f16pwm->f16Arg2 = MLIB_AddSat_F16(f16pwm->f16Arg2, DeadTime_H);
}
if(PMFDTMS_DT3 == 1)//负电流
{
f16pwm->f16Arg2 = MLIB_SubSat_F16(f16pwm->f16Arg2, DeadTime_L);
}
if(PMFDTMS_DT4 == 0)//正电流
{
f16pwm->f16Arg3 = MLIB_AddSat_F16(f16pwm->f16Arg3, DeadTime_H);
}
if(PMFDTMS_DT5 == 1)//负电流
{
f16pwm->f16Arg3 = MLIB_SubSat_F16(f16pwm->f16Arg3, DeadTime_L);
}

[Clarkhe]

[Clarkhe]

Current waveform after dead time compensation

[Clarkhe]

[Clarkhe]

Current waveform before dead time compensation