A Non-Isolated High Step-Up Interleaved DC-DC Converter with Diode-Capacitor Multiplier Cells and Dual Coupled Inductors

TL;DR

This paper introduces a novel non-isolated high step-up interleaved DC-DC converter with diode-capacitor multiplier cells and dual coupled inductors, achieving high voltage gain, reduced voltage stress, and improved efficiency for renewable energy applications.

Contribution

The paper presents a new converter topology combining diode-capacitor cells and coupled inductors for high step-up voltage conversion with continuous input current and low diode reverse recovery issues.

Findings

Achieved a 1000-V output from 30-V input in a 500-W prototype.

Demonstrated high voltage gain and low stress on power devices.

Validated the design through simulations and experimental results.

Abstract

In this paper, a non-isolated high step-up dc-dc converter is presented. The proposed converter is composed of an interleaved structure and diode-capacitor multiplier cells for interfacing low-voltage renewable energy sources to high-voltage distribution buses. The aforementioned topology can provide a very high voltage gain due to employing the coupled inductors and the diode-capacitor cells. The coupled inductors are connected to the diode-capacitor multiplier cells to achieve the interleaved energy storage in the output side. Furthermore, the proposed topology provides continuous input current with low voltage stress on the power devices. The reverse recovery problem of the diodes is reduced. This topology can be operated at a reduced duty cycle by adjusting the turn ratio of the coupled inductors. Moreover, the performance comparison between the proposed topology and other converters are introduced. The design considerations operation principle, steady-state analysis, simulation results, and experimental verifications are presented. Therefore, a 500-W hardware prototype with an input voltage of 30-V and an output voltage of 1000-V is built to verify the performance and the theoretical analysis.