Inverter Generator Design Specifics

I recently joined this forum because I was looking for detailed information on the theory and application of portable inverter generator designs. I found an older thread with some interesting information and a lot of conjecture. As I continued my search, I came across this patent description of the Yamaha design, including their unique "Boost" feature. For anyone interested, here is the link:

https://patents.google.com/patent/US6819007