To realize the buck/Raise function, all that is needed is 2 independent switches so the AC input may be linked to one of many two Main taps, when the load is connected to another, Therefore utilizing the most important transformer's Most important windings as an autotransformer. Uninterruptible power supply (UPS) https://pantip65296.blogsumer.com/33011157/5-simple-techniques-for-uninterruptible-power-supply-adalah