Application of Relay Feedback with Sliding Mode Control for Buck Converter System

The Power Electronic Converters (PEC) system is an electromechanical device for electrical conversion. It has various control methodologies including linear control and non-linear control. One of the PEC systems is the Buck Converter which has the main task of controlling the output voltage. One of the problems in Buck Converter is its loop stability. The Switching control in Buck Converter uses a high frequency that can damage components and MOSFET switch on Buck Converter. Buck converter voltage is controlled by regulating Pulse Width Modulation (PWM) in the frequency-domain. The switching process uses high-frequency signals which may lead to instability to the system. This paper presents an application of relay feedback with sliding mode control (SMC) to improve the performance of the Buck Converter. An analysis and simulation by the schematic diagram of relay feedback were performed in this work. The purpose is to find the best control parameter for relay feedback. Experimental results and their corresponding analysis in term of control specifications are discussed thoroughly in this paper.