TMS320F280039C: PFC Kit with DFF control?

Ari Mendes

Intellectual 425 points

Part Number: TMS320F280039C
Other Parts Discussed in Thread: TIDM-HV-1PH-DCAC, TIDM-1000

Hi,

I found the post below very interesting

https://e2e.ti.com/blogs_/b/powerhouse/posts/how-to-improve-power-factor-correction-with-dff

I would like to know if Texas has released any C2000 kits or application notes that use DFF control?

over 3 years ago

0 Shamim Choudhury over 3 years ago

TI__Genius 11955 points

Please see TIDM-HV-1PH-DCAC on ti.com

The control diagram shows the feed-forward control

Shamim

0 Ari Mendes over 3 years ago in reply to Shamim Choudhury

Intellectual 425 points

Shamin,

The documentation of the tidm-1000 (tiducj0g.pdf)

in equation 13 (6.4.2)

duty1PU = ( ( iL1Meas - iL1Ref ) * Gi_GainKp + v1Meas) / vBusHalfMeas

I don't understand why duty cycle feedforward is v1Meas/VbusHalfMeas. In this case the duty is smaller when V1Meas is small in relation to Vbus. Shouldn't it be (Vbus - V1meas)/Vbus? So that Duty is bigger when V1meas is smaller?

0 Shamim Choudhury over 3 years ago in reply to Ari Mendes

TI__Genius 11955 points

This equation comes from the current loop model shown in Fig 5, page 9. You should be able to derive this by looking at the diagram.

When output volt (V1Meas) is smaller then duty is smaller because Vbus is constant.

Shamim

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280039C: PFC Kit with DFF control?