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US5027264A   [0002] 
DE3721591A1   [0003] 
JP2013085394A   [0004] 
US20020126517A1   [0004] 
CN102403905A   [0004] 

A Three-Phase soft-switched High-Power-Density dc/dc Converter for High-Power Applications   [0002] 
PERFORMANCE CHARACTERIZATION OF A HIGH-POWER DUAL ACTIVE BRIDGE DC-TO-DC CONVERTER   [0004] 
Ensuring soft-switching operation of a three-phase dual-active bridge DC-DC converter applying an auxiliary resonant-commutated pole   [0004] 
A New Approach to Solid-State On Load Tap Changing Transformers   [0026]