To realize the buck/Increase element, everything is needed is 2 independent switches so which the AC enter could be linked to one of the two Major taps, when the load is linked to one other, Hence using the principal transformer's Principal windings being an autotransformer. This solution is for rescuing https://raymondjoaiq.weblogco.com/33912160/the-fact-about-ups-uninterruptible-power-supply-that-no-one-is-suggesting