公开(公告)号：US20230330704A1

公开(公告)日：2023-10-19

申请号：US18128031

申请日：2023-03-29

Applicant: Pepperl+Fuchs SE

Inventor： Mark Heinrich Ewald Rode

IPC: B06B1/02 ,  H02M3/156 ,  H02H3/20

CPC classification number: B06B1/0215 ,  H02H3/20 ,  H02M3/156 ,  B06B2201/40 ,  B06B2201/55

Abstract: The invention refers to a driving circuit (2) for a piezoelectric ultrasonic transducer (4) in an ultrasonic transducer system (1), comprising: a transformer (21) having at least one primary-side winding (22, 22′, 22″); a switching unit having a semiconductor switch (24′, 24″) connected to the at least one primary-side winding (22, 22′, 22″) via a switched connection (A′, A″); and, a control unit (5) which is configured to alternately apply an operating voltage (UB) to the at least one primary-side winding (22, 22′, 22″) or to disconnect it therefrom, a protection circuit (25) which is electrically coupled to the switched connection (A′, A″) and which has a Zener diode (ZD1) which limits a switch-off voltage at the switched connection (A′, A″) in terms of magnitude to a limiting voltage (UG) which corresponds to at least twice the operating voltage.