Harmonic distortion reduction schemes for a new 100 A-48 V power supply

A new modular 100 A, 48 V power supply is presented, and techniques for improving the performance of its preregulator are described. These techniques address traditional shortcomings of the boost converter topology, such as uncontrolled diode reverse recovery, switch voltage overshoot, and EMI emission/susceptibility. Experimental results are used to evaluate the merits of each circuit variation and to determine the optimal solution for different power ranges. Special attention is given to the impact of total harmonic distortion (THD) correction on overall rectifier size, weight, input/output noise emission and line current conditioning, lightening surge ruggedness, and reliability, as well as commercial requirements such as product cost, modularity and regulatory compliance