TMS320F28035: HVPSFB Lead leg shaking

The changes between the attached program and program in controlsuite  (C: \ Ti \ controlsuite \ development_kits \ hvpsfb_v1.1 \ hvpsfb_pcmc) is:

1. The chip is changed from TMS320F28027 to TMS320F28035. 

2. The peak current input is a constant volatage to DSP ADC about 0.5117216117216117 ~ 0.5157509157509158, and the digital quantity sampled by ADC is adcresult Adcresult2, the value is between 635 and 640.

3. Iref is generated by DSP itself:

Iref += 100;

If（Iref >= 4700000）

{

Iref = 4400000;

}

In particular, when Iref is the following value, 0，4508500， 4660000， the waveform is shaking. As shown in the figure below, yellow is the lag arm (pwm1b), and green is the lead arm (pwm2a)

Iref = 0;

Iref = 4508500;

Iref = 4660000;HVPSFB_PCMC_TI20220303(1).rar

Green Deng：

We have recived your question and will reply you soon.

,

Green Deng：

This is the old PCMC PSFB design and since the original designer is not in TI, it may takes some time to look into it. Did you see the same issue by using TMS320F28027?

,

wang zhiwu：

I do not know if there is the same issue by using TMS320F28027.

,

wang zhiwu：

Do you mean the new PCMC PSFB design using 280049 is no this issue?

,

Green Deng：

TIDM-02000 does not have this issue.