LCL-Filter design for a battery charger based on buck converter (DCDC converter)

This paper illustrates a LCL-filter design for a high power DCDC converter such as a buck boost converter for a battery charging application. The filter is used to reduce load current fluctuations in order to increase the quality of the charging current. It can be used in applications with high requirements on the load currents. A DCDC converter with a LCL filter can also be used to investigate different battery types. It can be used to charge and discharge the battery with a defined reference current. A charging current with very low fluctuation allows charging of a battery with defined current form. This can be used to implement electrochemical impedance spectroscopy (EIS) and allows investigation of different battery types in order to estimate different battery states such as State of Charge (SoC), State of Health (SoH) or State of Function (SoF) of any battery type.