Family of Non-Isolated Quadratic High Gain DC-DC Converters Based on Extended Capacitor-Diode Network for Renewable Energy Source Integration

Many topologies in the area of non-isolated high-voltage gain dc-dc converter are reported for improving efficiency and voltage gain and to reduce the switch stress with the use of minimum number of components. A family of quadratic high-gain dc-dc converters using an extended capacitor-diode network is proposed in this article, and an extensive analysis has been conducted to assess their performances. The output voltage of the five proposed converters by considering the effect of parasitic elements is derived, and the analytical efficiency profiles are drawn. The proposed converters are designed for 650 V, 0.5 kW, and 50 kHz with a 48-V input source. The hardware prototypes are fabricated for the five converters, and the experimental results are presented. For the considered design, converters I and III give higher efficiency and lower voltage stress on the semiconductor devices. Converters IV and V are suitable for higher voltage gain applications. A dynamic model for converter I is derived and a controller is implemented for closed-loop operation. A suitable converter among the family can be selected according to the applications for the integration of renewable energy sources.