Non-isolated high step-up interleaved boost converter

The output voltage available from renewable sources like photovoltaic panels, fuel cells and battery banks are too low to be practically utilised. Therefore, the available voltage must be stepped up considerably before connecting to the load. In this paper, a novel topology, which consists of two interleaved stages and five voltage multiplier cells, is presented. The topology is derived from a classical boost converter and utilises two switches, two inductors for the interleave stage,12 diodes, 12 capacitors and one voltage lift capacitor to provide a voltage gain of 14. In general, a topology that provides a gain (
N
+ 2) times that of a classical boost converter utilises (2
N
+ 2) diodes and (2
N
+ 2) capacitors along with a voltage lift capacitor. The primary feature of this topology is its capability to provide high-conversion ratio without using a transformer; additional features are, continuous input current, moderate duty cycle operation and modularity. Experimental results obtained from a 100 W, 24 V/336 V prototype demonstrate the feasibility of the converter and validate the converter design.

Keywords: boost converter, interleaved converter, voltage lift technique, voltage multiplier cell, non-isolated