Investigation and implementation of a common ground DC-DC buck converter with a novel control method for loss reduction in the converter

Abstract

This paper proposes a new control method for loss reduction of two series buck converters. The proposed method can be applied to each series of buck converters with two power switches. To enhance the efficiency of the converter compared to other structures, a method based on determining operating cycles for loss reduction is employed, leading to increased output efficiency of the converter. Additionally, to demonstrate the efficiency improvement using the proposed method compared to the conventional approach, the efficiency of converter is calculated through theoretical computations under real conditions, and the output results are compared for both losses and efficiency. In addition, the proposed high-buck converter in this paper benefits from a common ground advantage and exhibits a suitable conversion ratio. The high-buck converters are used in numerous applications for situations with low voltage and low power. The most important applications for these converters are the power supply for mobile phones, tablets, and other portable electronic devices, battery chargers, and LED drivers. Here, in order to demonstrate the validity of the proposed method, the MATLAB-Simulink results are provided. Moreover, in order to show the feasibility of the high-buck converter, a 100-W prototype has been implemented and the experimental results are provided.