公开(公告)号：US11056914B2

公开(公告)日：2021-07-06

申请号：US16849370

申请日：2020-04-15

Applicant: STMicroelectronics S.r.l.

Inventor： Roberto La Rosa ,  Alessandro Finocchiaro

IPC: H01F27/42 ,  H01F37/00 ,  H01F38/00 ,  H02J50/00 ,  H02J50/20 ,  H02J50/40 ,  H02J7/00 ,  H02J7/34 ,  H02J7/35

Abstract: A first Radio-Frequency-to-Direct-Current (RF2DC) transducer receives a first signal from a sensing antenna and generates energy stored by an energy storage circuit. An energy transfer circuit is controllably switched between an energy storage state where energy is stored in the energy storage state and an energy transfer state where stored energy is transferred to a load. The voltage at the energy storage circuit is alternatively variable between an upper value and a lower value around a voltage setting point. A second RF2DC transducer, which is a down-scaled replica of the first RF2DC transducer, produces a second signal indicative of an open-circuit voltage of the first RF2DC transducer. The voltage setting point is set as a function of the second signal indicative of the open-circuit voltage of the first RF2DC transducer.