CCS/TIDM-BLPFC: BLPFC: some data in the code is doubtful

1. This is for scaling the signal appropriately. This is explained in TI appnote spra902a, section 3.2.2

Now, in calculating the inverse, Vinv, of Vdc1, i.e., Vinv=1/Vdc1, it is clear that Vinv is maximum when
Vdc1 is minimum and vice versa. Therefore, to achieve better accuracy in the fixed-point representation of
Vinv, it is necessary to represent this with a pu value normalized with respect to its own maximum value.
For a sine-wave input voltage, the minimum value of Vdc is 2Vmin/p, where, the minimum amplitude,
Vmin, of the rectified input voltage is selected based on the input operating voltage range of the PFC
converter. For example, to operate the PFC converter with a low line voltage of 90Vrms, the chosen value
of Vmin should be less than or equal to 127V. With the selected value of Vmin, the maximum value of
Vinv is (p/2Vmin) and the corresponding pu value of Vinv with respect to its own maximum value is:
Once Vinv is calculated with the maximum accuracy, the feed-forward component C can be calculated
with the same accuracy as,

2,3. This is also for signal scaling. It is explained in the appnote.

Shamim