S12 / MagniV MicrocontrollersのトピックRe: Desaturation Error

Desaturation Error

chdingding — Wed, 20 Jun 2018 03:09:00 GMT

Hi,

I download the source code from NXP website,

so as to motor can be started, at first #define ADVANCE_ANGLE FRAC16(0.4815),

and another macro define ：#define ADVANCE_ANGLE1 FRAC16(0.08),

when the motor speed reach the certain speed, i want to let the motor‘s speed much faster,so we will let advanceAngle decrease ,judge

if(advanceAngle>ADVANCE_ANGLE1)
advanceAngle-=2;

when ADVANCE_ANGLE < 0.12 , GDUDSE ERR will appear.

i don't know where is wrong, and how to correct it.

below figure is my Schematic，

Re: Desaturation Error

alejandro_cervantes — Wed, 20 Jun 2018 23:40:07 GMT

Hello Chding,

Are you using our MTRCKTSBNZVM128 (BLDC) or MTRCKTSPNZVM128 (PMSM) software examples?

https://www.nxp.com/webapp/sps/download/preDownload.jsp

What are the values of GDSLLS and GDSLHS registers?

Regards,

Re: Desaturation Error

chdingding — Thu, 21 Jun 2018 00:09:49 GMT

Hi Jimenez,

Thank you for your reply！ We using MTRCKTSBNZVM128 (BLDC) software examples, next is the source code of GDU module configuration.

The values of GDSLLS and GDSLHS are 0x07,

Vdesatls = 1.40V

/*****************************************************************************
*
* Function: void initGDU(void)
*
* Description: GDU module configuration
*
*****************************************************************************/
void initGDU(void)
{
GDUE_GCPE = 1; // charge pump

GDUE_GCSE0 = 1; // enable Current Sense Amplifier 0

GDUF = 0xff; // Flag Register - clear all error flags

GDUBCL = 0x0F; // Set coil current limit to maximum 750mA

GDUCLK1_GBOCD = 0b10001; // Set boost frequency ~ 0.52MHz

GDUCLK1_GBODC = 0b11; // Set duty cycle to 75%

GDUE_GBOE = 1; // Enable boost

GDUCLK2_GCPCD = 2; // Fbus / 32

GDUCTR = 0x13;//0x13; // blanking time

GDUDSLVL = 0x77; // desat. level

GDUE_GFDE = 1; // enable FET pre-driver

GDUDSE = 0x77; // Clear Desaturation Error Flags
}

Re: Desaturation Error

雪辰彭 — Thu, 21 Jun 2018 01:38:10 GMT

I have the same problem as you. I download the source code(bldc) from NXP website,and modify the configuration as follows:

#define ADVANCE_ANGLE FRAC16(0.01)

GDSLLS=7;

GDSLHS=7;

GDUCTR=0XBB;

Unfortunately,the GDUDSE error will appear as soon as advanceAngle is less than FRAC16(0.12).Have you solved the problem?

Re: Desaturation Error

雪辰彭 — Thu, 21 Jun 2018 03:57:42 GMT

Hello,

I have the same problem. I download the source code(bldc) from NXP website,and modify the configuration as follows:

#define ADVANCE_ANGLE FRAC16(0.01)

GDSLLS=7;

GDSLHS=7;

GDUCTR=0XBB;

Unfortunately,the GDUDSE error will appear as soon as advanceAngle is less than FRAC16(0.12).

Regards,

Re: Desaturation Error

chdingding — Fri, 22 Jun 2018 01:46:25 GMT

Sorry, I haven't solve this problem now, if i find the answer, i will write here.

Re: Desaturation Error

pachamatej — Wed, 27 Jun 2018 05:21:23 GMT

Hello,

Since your issue cannot be experienced with our devKit/EVB, I assume it would be connected with your HW. Have you checked the drain-to-source voltage of the MOSFET indicating the desaturation? If it is below 1.4 V, then you would need to check the HD pin or phase pins for peaks or ringing. If that would be the case, you can try to adjust the blanking time or implement a HW filter (RC-filter) to these pins.

Best regards,

Matej