Ultra-high Voltage Gain Non-isolated DC-DC Converter with Continuous Input Current

Abstract

A novel "Cascaded Active Switched LC Network-based DC-DC (CASLCN) non-isolated converter" is proposed to achieve an ultra-high voltage gain and minimal voltage stress across MOSFETs. Unlike conventional DC-DC converters, which require more components to attain high voltage gain, typically at a duty ratio > 70, the CASLCN converter focuses on improving the numerator part of the output-to-input voltage ratio. This allows for achieving ultra-high gain even at lower operating duty ratios, reducing conduction losses. The CASLCN topology offers continuous input current, reduced switch stress, a transformer-less design, and ultra-high voltage gain, making it an attractive option. This paper presents a comprehensive description of the CASLCN converter, including its various modes of operation and detailed steady-state analytical waveforms. A state-space model of the CASLCN topology is derived to analyze its dynamic behavior. The functionality of the CASLCN converter is verified using a laboratory prototype, and its performance is assessed through the presentation of experimental results.