公开(公告)号：EP4326038A1

公开(公告)日：2024-02-21

申请号：EP23188320.8

申请日：2023-07-28

Applicant: STMicroelectronics S.r.l.

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

IPC: H10N30/80

Abstract: A differential piezoelectric actuator-system (10) includes an inductor (L) and driver-circuit (11, 12) having switches (S1-S6) for transferring energy between first and second actuators (PZT1, PZT2) and the inductor, and between a voltage-supply node (Vbatt) and the inductor. Control circuitry (21) 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.