Abstract
This paper deals with the negative effects produced by unexpected energy of solar array and methods of suppressing the effects for the sequential switching shunt regulator (S3R). The complex space operation conditions such as plasma environment and accidental impact are likely to cause abnormal discharge of solar array, leading to unexpected changes in the input energy of an S3R. Effects of unexpected energy on current stress and power loss of power devices, over-regulation of the S3R and quality of output voltage are represented and analyzed in this paper. A shunt regulator topology based on the switch current limiting drive (SCLSR) is then proposed to suppress current stress and power loss of power devices, thereby alleviating negative effects. Finally, simulation and experimental results are provided to illustrate the negative effects of unexpected energy and validate the proposed shunt regulator.
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