A non-resonant linear soft-switching DC-DC step-up conversion topology featuring current balancing for aerostat power systems

Applications for near-space aerostats are numerous and include scientific experiments, geological exploration, and communication support. The power conversion equipment in these systems must have characteristics like high efficiency, miniaturization, and lightweight construction because of their particular operating environment. The significance of creating a DC-DC converter with high efficiency, high power density, and high voltage gain is highlighted by the low output voltage of the solar cell in the aerostat power system and the high voltage of the DC bus. Thus, using a high gain clamping capacitor converter and non-resonant soft-switching approaches, this work suggests a novel non-resonant linear (NRL) soft-switching DC-DC step-up converter with current balancing. The suggested converter can eliminate the device current spike brought on by charging and discharging capacitors by implementing zero-current-switching (ZCS) turn-on of switches and ZCS turn-off of diodes. Finally, the validity and correctness of the proposed converter are verified by simulation and experiment, which provides a novel topology choice for DC-DC step-up converter in near-space aerostat power systems.