Optimal design of a redundant high current DC/DC converter

This paper discusses an optimal design of a highly efficient redundant paralleled multiphase buck converter with active current sharing scheme. “N+1” redundant power supplies are commonly employed in high-reliability and fault-tolerant systems. To achieve high performances, active current sharing and remote voltage sensing are typically implemented in redundant paralleled DC/DC power supplies. A detailed modeling of the current sharing scheme and implementation of remote voltage sensing are discussed in paper. A 12V input, 5V/100A output prototype is implemented to validate the design concepts. Comprehensive experimental results show good current sharing performance and dynamic voltage response, and a peak efficiency of 94.89% of this redundant converter is realized.