Fault tolerant control method for interleaved DC-DC converters under open and short circuit switch faults

This paper proposes an adaptive democratic current sharing control scheme for interleaved dc-dc converters under faulty condition. The proposed fault tolerant control approach can achieve the desired output voltage generation, and equal current sharing among the remaining healthy modules as more and more modules fail. The main idea is to adaptively change the outer voltage and inner current controller gains once the fault is detected in the modules. The proposed control scheme is compared to the democratic current sharing control scheme under the fault condition and step load variation. The results show that it achieves improved output regulation and accurate current sharing among the modules. The presented fault tolerant control method has been analyzed, tested, and validated for the interleaved boost converter.