Zero Voltage Switching DC-DC Buck Converter with Predictive High Current Mode Control

Abstract

A Zero Voltage Switching (ZVS) Buck DC-DC converter with predictive high current mode control and control system models are proposed, developed and simulated. The proposed buck topology with predictive high current mode control has advantages, which improve conversion efficiency, current sharing, and cycle-by-cycle current limiting protection, single-pole roll off as the means to achieve high efficiency and no reduction of the output current over the output voltage without reducing throughput power. In this paper the transient process at the start of the converter’s model is simulated, as well as the response of the output voltage regulator to an unexpected change in the load. The proposed circuits are developed in OrCad. Zero voltage switching technique used in a buck converter is more desire and preferable over a hard switched buck converter for low power and high frequency DC-DC conversion applications. In the paper work simulation models of a buck ZVS DC-DC converter and control system model has been simulated and investigated using an OrCad Capture CIS.