Auto Transformer – Working Principle, Features, and Types
An Auto Transformer is an electrical transformer that uses a single continuous winding for both the primary and secondary circuits. Unlike conventional transformers with separate windings, an auto transformer shares part of the same coil, which makes it more efficient, compact, and economical . It is widely used where electrical isolation is not required. Working Principle of Auto Transformer The working principle of an auto transformer is based on electromagnetic induction . When AC voltage is applied to the winding, a magnetic flux is produced in the core, inducing voltage across different sections of the same winding. Power transfer occurs in two ways : Inductively , through the magnetic field Conductively , through direct electrical connection Because of this combined power transfer, losses are reduced and efficiency is improved. Key Features of Auto Transformer Single winding for both input and output Less copper usage , reducing cost Higher efficiency tha...