Then there comes the two-stage voltage stabilizer. It uses two relays to deliver constant AC supply into the load during over voltage conditions and under voltage conditions. It does so by switching the relays, buck and boost operations as per the requirement.
This is the basic working model of every type of voltage stabilizer that is in use today. It must be noted that the underlying principle for them is almost same. Utilizing the permutation and combination of this principle the voltage stabilizers are of various types namely servo controlled, relay type and static voltage type. Discussing them in detail here is beyond the scope of current article. Please note that despite having the same underlying principle these different type of stabilizers differ in functionalities. Each one of them has its own pro’s and cons.