公开(公告)号：US20230234836A1

公开(公告)日：2023-07-27

申请号：US17583896

申请日：2022-01-25

Applicant: STMicroelectronics S.r.l.

Inventor： Raffaele Enrico FURCERI ,  Luca MOLINARI

IPC: B81B7/00 ,  G02B26/08 ,  B81B3/00

CPC classification number: B81B7/008 ,  B81B3/0043 ,  G02B26/0833 ,  B81B2201/042 ,  B81B2207/03

Abstract: Techniques to be described herein are based upon the combination of a digital lock-in amplifier approach with a numerical method to yield accurate estimations of the amplitude and phase of a sense signal obtained from a movement sensor associated with a resonant MEMS device such as a MEMS mirror. The techniques described herein are efficient from a computational point of view, in a manner which is suitable for applications in which the implementing hardware is to follow size and power consumption constraints.

公开(公告)号：US20240049604A1

公开(公告)日：2024-02-08

申请号：US18222180

申请日：2023-07-14

Applicant: STMicroelectronics S.r.l. ,  Politecnico Di Milano

Inventor： Marco ZAMPROGNO ,  Raffaele Enrico FURCERI ,  Matteo GIANOLLO ,  Giacomo LANGFELDER

IPC: H10N30/80 ,  H02M3/158 ,  H02J7/00 ,  H02N2/06

CPC classification number: H10N30/802 ,  H02M3/158 ,  H02J7/0068 ,  H02N2/06

Abstract: A differential piezoelectric actuator-system includes an inductor and driver-circuit having switches for transferring energy between first and second actuators and the inductor, and between a voltage-supply node and the inductor. Control circuitry determines whether a next phase in which to operate the driver-circuit is a first charging-phase or a first recovery-phase. The first charging-phase includes operating the switches in: a first sub-phase to transfer energy from the first actuator to the inductor; a second sub-phase to transfer energy from the voltage supply node to the inductor; and a third sub-phase to transfer energy from the inductor to the second actuator. The first recovery-phase includes operating the switches in: a first sub-phase to transfer energy from the first actuator to the inductor; a second sub-phase to transfer energy from the inductor to the voltage supply node; and a third sub-phase to transfer energy from the inductor to the second actuator.

公开(公告)号：US20240049603A1

公开(公告)日：2024-02-08

申请号：US17879066

申请日：2022-08-02

Applicant: STMicroelectronics S.r.l. ,  Politecnico Di Milano

Inventor： Marco ZAMPROGNO ,  Raffaele Enrico FURCERI ,  Matteo GIANOLLO ,  Giacomo LANGFELDER

IPC: H01L41/04 ,  H02N2/06 ,  H02M3/158

CPC classification number: H01L41/042 ,  H02N2/06 ,  H02M3/158

Abstract: A differential piezoelectric actuator-system includes an inductor and driver-circuit having switches for transferring energy between first and second actuators and the inductor, and between a voltage-supply node and the inductor. Control circuitry determines whether a next phase in which to operate the driver-circuit is a first charging-phase or a first recovery-phase. The first charging-phase includes operating the switches in: a first sub-phase to transfer energy from the first actuator to the inductor; a second sub-phase to transfer energy from the voltage supply node to the inductor; and a third sub-phase to transfer energy from the inductor to the second actuator. The first recovery-phase includes operating the switches in: a first sub-phase to transfer energy from the first actuator to the inductor; a second sub-phase to transfer energy from the inductor to the second actuator; and a third sub-phase to transfer energy from the inductor to the voltage supply node.

公开(公告)号：US20210364375A1

公开(公告)日：2021-11-25

申请号：US16877746

申请日：2020-05-19

Applicant: STMicroelectronics S.r.l.

Inventor： Marco ZAMPROGNO ,  Andrea BARBIERI ,  Pasquale FLORA ,  Raffaele Enrico FURCERI

IPC: G01L1/22 ,  G01D5/16 ,  G01B7/16

Abstract: A bridge driver circuit applies a bias voltage across first and second input nodes of a resistive bridge circuit configured to measure a physical property such as pressure or movement. A sensing circuit senses a bridge current that flows through the resistive bridge circuit in response to the applied bias voltage. A temperature dependent sensitivity of the resistive bridge circuit is determined by processing the sensed bridge current. A voltage output at first and second output nodes of the resistive bridge circuit is processed to determine a value of the physical property. This processing further involves applying a temperature correction in response to the determined temperature dependent sensitivity.