An Algorithm for Failure Detection of A Power Mosfets In Non-Isolated Boost DC-DC Converters for Photovoltaic (PV) Power Systems

Considering the intermittent nature of photovoltaic (PV) power generation and the potential faults within PV systems, this paper proposes an algorithm for detecting power switch failures in DC-DC converters. The algorithm does not require an additional MOSFET or extra sensors. Instead, it utilizes over-current at the slope of the input inductor as an indicator of system failure. This method proves to be cost-effective and simpler compared to traditional approaches that involve adding redundant MOSFETs or sensors, or designing specialized monitoring software. The algorithm was tested in a simulation environment and validated through a simple laboratory experiment. The results indicate promising potential for improving the reliability of power MOSFETs in non-isolated converters integrated into PV power systems. Keywords: MOSFET Failure, DC-DC Converters, PV Power System.