Switched Inductor-Capacitor Network Based Non-Isolated DC-DC Converter: A Double2 Gain Converter with Single Switch

Abstract

This paper proposes a novel non-isolated high gain dc-dc (NHGDC) converter using a switched inductor-capacitor network. The converter has twelve components including the four capacitors, two inductors, five diodes and one semiconductor switch. Though the NHGDC converter has twelve components, it uses only one semiconductor switch and achieves a maximum theoretical gain of twenty at a duty ratio of 0.8. The steady-state output voltage equation of the converter is derived with the help of the analytical waveforms. The theoretical voltage gain of the NHGDC converter is 4/(1-d). Thus, the NHGDC converter is named as a double2 gain converter. The voltage gain of the high gain dc-dc converters is significantly affected due to the parasitic elements of various components present in the converter. So, a detailed analysis has been conducted to assess the effect of parasitic elements on the output voltage of the double2 gain converter. The proposed structure has only passive elements in the discharging path when the energy is discharged into the load side. The performance comparison has been conducted to measure the potential merits of the double2 gain converter compared to the recently reported high gain dc-dc converters. A hardware prototype of the double2 gain converter has been fabricated, and an experimental setup is assembled in the laboratory for testing. The output waveforms from various parts of the converter are observed during the testing, and the waveforms are presented in this paper. The double2 gain converter will be useful for the integration of the low voltage dc sources such as ultracapacitor, fuel cell, battery, etc.