BLPFC Controlsuit PFC_BL_ICMD:n

tomue

HELLO,

now, I use BLPFC kit.

PFC_BL_ICMD,In assembly, the algorithm of this module is ：out = [(VacRect*VinvSqr*Vcmd*VmaxOverVmin)/(Vpfc*VoutMaxOverVinMax*Duty)]*(Vpfc*VoutMaxOverVinMax - Vacrect).

but,

I don't understand the specific operation of the PFC_BL_ICMD:n module,And then I found DPLIB.pdf,as flowing:

BUT,I found that this is just a block diagram of that algorithm, and I still don't understand how it works.Why is it designed like this?Why do these inputs carry out the reference current?Please tell me the algorithm.

Looking forward to your reply.

over 7 years ago

0 Veena Kamath over 7 years ago

TI__Mastermind 32635 points

Hi,

A TI applications engineer has been assigned to help with your issue. US sites are currently closed due to the Thanksgiving Holiday, so responses may be delayed.

Thanks and Regards,
Veena

0 tomue over 7 years ago in reply to Veena Kamath

Prodigy 90 points

thanks,Happy Thanksgiving Holiday!
I will waiting...

0 tomue over 7 years ago in reply to Veena Kamath

Prodigy 90 points

Have you finished your Thanksgiving? People?

0 Shamim Choudhury over 7 years ago in reply to tomue

TI__Genius 11945 points

This comes from small signal model of the PFC power stage. This is well known in industry and has been used for many years. Please read related literature on PFC control and you will understand this principle. FYI, I am attaching one of these related docs. A second one will follow. Pls review others as needed.

2308.Dixon_HighPF_slup087.pdf

0 Shamim Choudhury over 7 years ago in reply to Shamim Choudhury

TI__Genius 11945 points

8053.Dixon_Optmizing_PF_slup093.pdf

0 tomue over 7 years ago in reply to Shamim Choudhury

Prodigy 90 points

Thank you for your reply, but I still don't understand.

This is what you see here：

a=Vcmd*Vinvsqr*Vrect

b=Vpfc*Vout_max/Vin_min-Vrect,

c=Vpfc**Vout_max/Vin_min*duty

out=a*b*c*Vmax/Vmin

Why???

1 Vinvsqr is it a smaller multiple?

2 Vout_max/Vin is it a smaller multiple?

Why it minus Vrect?

Or we can't take the whole formula
disassemble....

Can you explain it in detail?

Or is there an algorithm document for this model?

Looking forward to your reply。thanks .

0 Christopher Bietz over 7 years ago in reply to tomue

Prodigy 30 points

Hello,

I too would greatly appreciate additional details about the PFC_BL_ICMD block. The C28x Digital Power Library Module User's Guide unfortunately provides only the bare minimum of usage information and leaves a lot to be desired.

A quick explanation of how and why the individual input signals contribute to the final current reference as well as why the two constants are necessary and what the effects of misconfiguration would be, would enhance the usefulness of the User Guide considerably.

I am hoping you can provide some further insight into this key-component of the BLPFC control system.

Thanks and best regards,

Chris

0 Shamim Choudhury over 7 years ago in reply to Christopher Bietz

TI__Genius 11945 points

5047.BLPFC_Isw_IL_Conversion.pdf

Please find the attached file related to the details of BL PFC ICMD.

Shamim

0 Christopher Bietz over 7 years ago in reply to Shamim Choudhury

Prodigy 30 points

Hello Shamim,

thanks a lot, this clears things up.

Best regards,

Chris

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BLPFC Controlsuit PFC_BL_ICMD:n