Design and Construction of Variable DC

Abstract- The purpose of this paper is to design and construct variable DC power supply for laboratory using switch mode DC to DC converter. The regulated power of a variable output voltage ranging is from 0 to 36 V with a maximum output current of 3A is presented in this paper. This variable DC power supply is based on the step-down and step-up output voltage process which use both buck and boost converter topologies. A switching converter comprise of capacitors, an inductor, a diode and a switch. DC power supply is an essential device for most of electrical circuits and engineering students. The benefits of this design are; reduce size, less expensive and energy save. In this design, a microcontroller is used to control output voltage for precise and stability. The output voltage and duty cycle is displayed with LCD display