A hybrid energy storage module based around two strings consistent of three battery cells as an energy optimized string, and four super-capacitors as a power surge optimized string is presented. The energy transfer between the two strings is carried out using a series resonant link, that connects a battery to two super capacitors. The rest of the cells are equalized by series resonant balancers that shuttle the energy along each of the strings. The serial resonant link between the strings results in faster energy transfer, operates more efficiently than previous options, and reduces component count comparing to the latest available solutions. The equalization circuit module is analyzed, operation modes and equivalent behavioral model are presented. Hybrid energy storage connection to a common DC bus options are outlined, and three setups that provide added value for dual string architecture are shown. Dual voltage source management methods are summarized, along with their advantages and down sides. The system is evaluated in simulation, and an experimental prototype was built and tested. The simulation and experimental results are in a good agreement with theoretical predictions.
