TIEVM-VIENNARECT: VIENNA TMSF28379D schematic diagram，the code control loop

Hi,

Just want to let you know I am looking into these questions and will get back to you soon.

Regards，

Chen

Thank you very much. sorry，I thought nobody answered me.

Hi,

I will suggest to take look at the training video here if you have not watched it before:

https://training.ti.com/solutions-fast-charging-electric-vehicle-supply-equipment-evse-design

1. This should be the transfer function between the duty cycle and the sensing current feedback signal. There might be some typo.

2. I think N represent the two boxes between Ki_gain and the H_load which consists of C0 and RL.

3. SDFM module is useful in the code. It depends whether you select it or ADC in the settings.h

4. Yes, it is. No, we don't have Altium version of this one. We start to have the altium version in f28004x.

Regards,

Chen

Thank you.

1.As you say,As you said, the iL* here should be iL（This is my own understanding after watching the video.）

2.N should be η，As efficiency（This is my own understanding after watching the video.）

3.

Is the slide in this video clearer and harder to see?

4.

line 515：Why multiply the current value by the mean of the measured voltage/the effective value of the voltage?

line524：How to get the formula of inductance voltage drop, current difference *L*f* current maximum sampling/voltage maximum sampling，why? I  don't understand the formula.

Looking forward Your explanation.

regard,

Jia

For question 3: You can download the slide at the end of the page.

https://training.ti.com/sites/default/files/docs/Webinar%2016%20-%20Solutions%20for%20fast%20charging.pdf

For question 4: it is not mean of the measured voltage/the effective value of the voltage. It is instant V1 V2 V3/ RMS value of the voltage. 

So basically it is regulating the instant phase current reference to be aligned with the three phase voltages which has 120 degree phase shift.

It is actually  "current reference/voltage reference " in the equation. Because you can not directly calculate the voltage pu value from the current pu value. The reference is different. 

VIENNA_PFC_INDUCTOR_VALUE *(VIENNA_iL1Ref_pu - VIENNA_iL1Ref_prev_pu) * VIENNA_I_MAX_SENSE_AMPS * VIENNA_ISR_CONTROL_FREQUENCY_HZ
/ VIENNA_V_MAX_SENSE_VOLTS

You can understand in the way above. 

Regards,

Chen

1.line515：I still can't understand why the instantaneous value of the current multiplied by (the instantaneous value of the voltage/the standard unitary value of the voltage) can align the instantaneous value of the current with the instantaneous value of the voltage.

2.

What is the mean of "ADC_isBaseValid(base)"?I see a lot of similar expressions in the program.

3.

The duty cycle here is different from that in the control ring. why？There is no maximum plus minimum voltage in the formula.

4.Why Set up Analysis GPIO Port First？

5.How to detect zero-crossing? What does threshold mean and why is it compared with voltage value（line167）?