New Enhanced Family of QBC Topologies: Mitigating Capacitor Stress and Increasing Voltage Gain

This article proposes a family of modified quadratic boost converter (QBC) topologies designed to alleviate voltage stress on the output capacitor while achieving higher voltage gains compared to conventional converters. The output voltage is synthesized from the combined voltages of two capacitors, effectively mitigating stress on the output capacitor. Additionally, the voltage of the source contributes to the formation of the output voltage. Ten topologies are presented, with nine demonstrating enhanced voltage gain relative to the QBC topology. The voltage gains of all proposed topologies are analyzed. However, only the primary topology of the converter family is examined in detail and confirmed through experimentation. The main topology is evaluated under both ideal and non-ideal operating conditions, including sensitivity analyses of voltage gain and efficiency. An 80 W prototype is constructed, and practical implementation validate the introduced family theory and objectives. The primary converter's efficiency exceeds 95 % for a rated power of 80 W.