Ultra-High Gain Quadratic DC-DC Topology Using Two-Winding Coupled Inductors With Voltage Multiplier Cells

Abstract

High-gain DC-DC converters have become very important devices in the operation of renewable energy methods such as wind and solar power to provide the required voltage and current levels. This work describes a new common ground ultra-high step-up DC-DC converter constructed with coupled inductors that has a high voltage conversion ratio, minimal voltage stress over semiconductor parts, and high performance. To improve the voltage gain, approaches using a linked inductor and voltage multiplier circuit were employed. The blocking voltages of power MOSFETs are clamped at low levels by voltage multiplier cells and can be regulated by the turn ratio of the coupled inductor, reducing the voltage rating of semiconductors and the cost of the conversion device. The proposed topology and corresponding functionalities are described by delineating the operating modes, steady-state analysis, and a comparative analysis. Experimental results are provided with a 425 W output power at a 100 kHz switching frequency of operation to validate the voltage enhancement achieved by the proposed architecture.