A Digital Current Controlled Soft-Switching DC-DC Converter with High Voltage Gain for Renewable Energy Sources

Renewable energy sources are given utmost importance nowadays. They are integrated with grid using suitable power electronic components and inverter. Before providing renewable energy output to inverter, it has to be conditioned by all means. This paper proposes an efficient converter for conditioning. A digital current controlled zero-voltage-switching (ZVS) dc-dc converter with high voltage gain is proposed for Renewable energy applications as a front-end converter. It consists of a ZVS boost converter stage and a ZVS half-bridge converter stage with voltage quadrupler circuit and two stages are merged into a single stage. The ZVS boost converter stage provides a continuous input current and ZVS operation of the power switches. The ZVS half-bridge converter stage provides a high voltage gain. The principle of operation and system analysis are presented. Theoretical analysis and simulation result of the proposed converter with digital current controller were verified.