**5.6 Power electronics**

Supercapacitors are, and in the future will be, increasingly used in power electronics assemblies of medium power, where they serve as reservoirs of electrical energy in the transition mode. There is a real possibility that they will soon replace bulky inductances, which are also huge sources of electromagnetic interference. In such an application, the supercapacitor must have both high capacitance and a relatively high operating voltage (which implies regular binding of the cells and all related problems). The internal resistance must be quite small, and the leakage current is not of major importance.

In **Figure 33** a schematic of a buck-boost converter with a supercapacitor for accepting braking energy is given.

In **Figure 34** the scheme of the SMPS converter with supercapacitor is given and **Figure 35** shows the supercapacitor in the inverter circuit.

**Figure 33.** *A typical modern supercapacitor system with a bi-directional converter with SC [64].*

**Figure 34.** *Supercapacitor system with SMPS converter [65].*

*Supercapacitors: The Innovation of Energy Storage DOI: http://dx.doi.org/10.5772/intechopen.106705*

**Figure 35.** *Supercapacitor system with switch mode rectifier in the inverter [66].*
