Switched Capacitor–Inductor Network Based Ultra-Gain DC–DC Converter Using Single Switch

Abstract

A switched capacitor-inductor network (SCLN)-based ultra voltage gain dc-dc converter using a single switch is presented. The SCLN converter can achieve ultra dc voltage gain with minimum number of devices when compared with other existing converters. Moreover, the voltage gain is significantly improved at entire duty ratios. In addition, due to switched approach of inductor and capacitor, the converter provides lesser ripple content in the output voltage and current. The operation of the converter in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is discussed. The parasitic elements are considered to estimate the dc voltage gain and the efficiency of the converter more precisely. The small-signal model of the converter is derived, and the pole-zero locations are investigated. Moreover, the comparative performances of the SCLN converter with existing converters are reported. A hardware prototype has been developed and tested. To prove the applications of the SCLN converter in solar PV system, the experimental results are observed by considering the output voltages of 650 V for three-phase and 325 V for single-phase applications.