Novel Scalable Topologies of High Power Density Quadratic Converters With Low Voltage Stress on Power Diode
Md Samiullah, Mohammed Al‐Hitmi, Atif Iqbal, Shirazul Islam
Abstract
High gain DC-DC converters are used for a number of applications including the power processing of several low voltage renewable energy sources (solar PV, fuel cells) while they are integrated into a microgrid. This paper introduces two novel designs of high power density non-isolated quadratic boost converters which neither uphold the cascaded architecture nor involve coupled inductors in them. The proposed converters utilize the switched inductors (SL) and switched capacitor (SC) based modules for voltage boosting. Despite having a higher output voltage, the proposed topology in its extended mode offloads the issue of high voltage stress at the devices. The output voltage can be extended to further higher levels without requiring additional circuits for PIV suppression at the output diode. The current at the input and output terminals are continuous which facilitates the converter for various applications such as DGs integration to microgrid and Uninterruptible power supplies for integrated battery storage systems. The switched inductor switched capacitor quadratic converter (SLSCQ) and its extended topology (ESLSCQ) are analyzed thoroughly in different modes of conduction and the performance is justified by developing a hardware prototype ranging for a maximum power of 400W. The switching frequency is maintained at 50kHz.