To realize the buck/Improve characteristic, all that is necessary is two separate switches so that the AC input might be linked to on the list of two primary taps, when the load is connected to one other, thus utilizing the most important transformer's Key windings as an autotransformer. From Java https://craftonhillscollege38260.59bloggers.com/34240351/5-simple-statements-about-uninterruptible-power-supply-calculator-explained