*3.2.1. Series resonant converter with capacitive output filter*

described above, different converter topologies can be used as represented in figures 11 to 13 below.UsuallytheDC-DCconverterisputbetweenthefuelcellandtheinverter,whichperforms two functions,namely; 1) acts asDC isolationforthe inverter; and2)produces sufficient voltage for the inverter input so that the required magnitude of the AC voltage can be produced. The

inverter can be single-phase or three-phase depending on the utility connection.

**Figure 11.** Configuration of a DC-AC converter interfaced directly to the grid.

342 New Developments in Renewable Energy

**Figure 12.** Configuration of a DC-DC followed by a DC-AC converter interfacing the grid.

**Figure 13.** Configuration of a DC-AC followed by a AC-AC converter interfacing the grid.

The converter topology shown in Figure 14 is in conformity with the considerations presented above. This is a modified series resonant converter (SRC), which uses an (L-C)||L resonant tank for soft switching of HF switches. The main characteristics of such type of converter can be summarized as follows:


**Figure 14.** Series Resonant converter with capacitive output filter.
