A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics . A switch-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) include control logic and oscillator. SMPS is in different types for 1phase, 2 phase , 3 phase. special features of switched-mode power supply: - Short circuit protection - High efficiency - Parallel connection in order to get more output power Bornika has the exclusive agent of Ziegler, DEIF and J.Schneider in the fields of consultation, sales and distribution of power industry products including Power Supply (Single-Phase Input, Two-Phase Input and Three-Phase Input and also DC input and 5v, 12v, 24v, 48v outputs in different powers .