CCS/TIDM-BLPFC: BLPFCv 1.0

Michael Koval27

Intellectual 990 points

Part Number: TIDM-BLPFC
Other Parts Discussed in Thread: CONTROLSUITE

Tool/software: Code Composer Studio

Why in project ControlSuite /DevelopmentKits/BLPFCv 1.0 module PFC_BL_ICMD.asm

DutyA is connected back to this module after CNTL_2P2Z:1

What is sense for this?

over 6 years ago

0 Shamim Choudhury over 6 years ago

TI__Genius 11935 points

This is because DutyA is needed to calculate the output for PFC_BL_ICMD module. Please read the documentation for PFC_BL_ICMD inside the DPLib.pdf file. This explains how DutyA is used to calculate the output of PFC_BL_ICMD.

Shamim

0 Michael Koval27 over 6 years ago in reply to Shamim Choudhury

Intellectual 990 points

We read DPLib.pdf and understood that DutyA is negative loopback for PFC_BL_ICMD module. But can not understand the sense of it. We read study books in theory of control systems and there are not such a loopback.

0 Shamim Choudhury over 6 years ago in reply to Michael Koval27

TI__Genius 11935 points

This comes from the inductor current to switch current conversion ratio. In BLPFC we changed the conventional PFC inductor current command to PFC switch current command since this is what is controlled in this PFC design. We do not sense inductor current directly. We sense switch current and control that current.

Attached doc explains how we can derive this conversion ratio.

Shamim7522.BLPFC_Isw_IL_Conversion.pdf

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CCS/TIDM-BLPFC: BLPFCv 1.0