As of my last knowledge update in September 2021, the term "rectiformer" doesn't appear to be widely recognized or established in the context of engineering or technology. It's possible that this term has emerged or become more relevant after that time, and I might not have information about it.
If "rectiformer" is a term or technology that has come into use after September 2021, I recommend checking more recent sources, such as technical literature, patents, or manufacturer documentation, to get accurate and up-to-date information about how it works and how it handles non-ideal input conditions.
If you can provide more context or details about what you mean by "rectiformer," I'd be happy to help with the information available up until September 2021.