Energy harvesting interface with improved impedance matching, method for operating the energy harvesting interface, and energy harvesting system using the energy harvesting interface

摘要

An energy harvesting interface (70; 70') that receives an electrical signal (V IN ) from an inductive transducer, and supplies a supply signal (I OUT ), comprises: an input branch including a first switch (30a) and a second switch (30b) connected together in series, between a first input terminal and an output terminal, and a third switch (31a) and a fourth switch (31b) connected together in series between a second input terminal and the output terminal; a first electrical-signal-detecting device (72), coupled across the second switch for detecting a first threshold value (I TH ) of an electric storage current in the inductor of the transducer; and a second electrical-signal-detecting device (74), coupled across the fourth switch for detecting whether the electric supply current that flows through the fourth switch reaches a second threshold value (Ip/K) lower than the first threshold value.