Analysis and Design of a Novel High-Step-Up DC/DC Converter with Coupled Inductors

Abstract

A new high step-up interleaved converter is proposed in this paper. This new high step-up converter utilizes the interleaved boost converter to be in series connection with the voltage-double module. The secondary sides of the coupled inductors are in interleaved series connection and shared by two voltage-double modules to accomplish the interleaved energy storage. Then, the input voltage, coupled-inductors, and multiplier capacitors are in series connection with the output to achieve the purpose of high voltage gain. The proposed circuit can be operated at a lower duty cycle to achieve high voltage gain by adjusting the turn ratio of the coupled inductors. The proposed circuit has less elements and the voltage stress of the switches and diodes can be decreased to reduce the cost. The conduction loss can be reduced and the efficiency can be increased when the switch with lower conduction resistance is applied.

Existing System

Integrating Coupled Inductor and Switched-Capacitor Techniques.

Proposed System

This paper proposes a new interleaved high step-up converter. This new high step-up converter utilizes the interleaved converter to combine the voltage-double module with the coupled inductor. The secondary sides of the coupled inductors charge the two voltage-double modules interleaved and then are in series connection with the input voltage and primary sides of the coupled inductors to charge the output side to achieve the effect of high voltage gain. In this proposed topology, the turn ratio can also be adjusted to further reduce the operating duty cycle and decrease the voltage stress of the switch.

Architecture

Proposed new interleaved series-type high step-up converter