Zero current transition type buck converter using soft switching scheme

Provided is a buck converter comprising: a main inductor for accumulating electric energy supplied from an input power source; a main switch for connecting or disconnecting the input power source and the main inductor; and an auxiliary circuit configured to reduce the voltage applied to the main switch when the main switch connects the input power source and the main inductor, and reduce the current flowing through the main switch when the main switch disconnects the input power source and the main inductor.