Different topologies of active EMI/ripple filters for automotive DC/DC converters

Newer models of vehicles employ an increasing number of critical and luxury electrical loads. Multi converter systems including AC/DC and DC/DC converters will be utilized in vehicles that will produce high frequency ripple and noise and will increase the electromagnetic interference. In this paper, different topologies of active ripple filters are introduced and discussed. Different topologies for current sensors, current injectors, and voltage injectors are also explained. The results of the experimental setup for two topologies are presented and compared with the results of passive filters.