About charging voltage control for battery

Kandyman

Dear Wolfspeed,

I have a question about how to adjust the charging voltage in battery charging mode.

The explanation in the document explains that the gain (battery voltage) is adjusted by PFM-PS in CLLC. Is it correct? 

In the case of CLLC PFM-PS control, I know that it has a very narrow gain range. so, is it possible to control the battery charging voltage(200-800Vdc) only with the CLLC PFM-PS controller while maintaining effective efficiency in the AC/DC DC fixed voltage state?

I wonder how to control the wide battery charging voltage.