Energy Harvesting for Sensors: AC Harvesters
Radiofrequency (RF) and mechanical energy transducers generate an alternating (ac) voltage and current that is proportional to the available power in the environment. There are other transducers (of different environmental energies) that also generate an ac signal. However, we have chosen these energies as the most representative in terms of the variety of energy conditioning circuits used. Other ac harvesters can use similar circuits and techniques to that presented in this chapter. Indeed, RF and mechanical energy sometimes benefit of the same energy conditioning circuit structures. However, note that each transducer has its own peculiarities that must be accounted for.