公开(公告)号：EP3926348A1

公开(公告)日：2021-12-22

申请号：EP21178626.4

申请日：2021-06-09

Applicant: STMicroelectronics S.r.l.

Inventor： POLETTO, Vanni ,  ERRICO, Nicola ,  VILMERCATI, Paolo ,  CIGNOLI, Marco ,  GENNA, Vincenzo Salvatore ,  ALAGNA, Diego

IPC: G01R19/00 ,  G01R19/165 ,  H02M1/00

Abstract: A circuit (100') comprises a high-side switch (HS) and a low-side switch (LS) arranged between a supply node (D) and a reference node (G), the high-side and low-side switches having an intermediate node (Q). A switching control signal ( com ) is applied with opposite polarities to the high-side and low-side switches. An inductive load (L) is coupled between the intermediate node (Q) and one of said supply node (D) and said reference node (G).
The circuit (100') further comprises current sensing circuitry (CS') configured to:
sample (12a, 14a) a first value ( I a ) of the load current flowing in one of the high-side and low-side switches at a first sampling instant ( t 1 ) before a commutation ( t s ) of the switching control signal ( com ),
sample (12b, 14b) a second value ( I b ) of the load current flowing in the other of the high-side and low-side switches at a second sampling instant ( t 2 ) after said commutation ( t s ) of said switching control signal ( com ),
sample (12b, 14c) a third value ( I c ) of the load current flowing in the other of the high-side and low-side switches at a third sampling instant ( t 3 ) after said second sampling instant ( t 2 ), and
generate (18) a failure signal ( fail ) as a function of said first ( I a ), second ( I b ) and third ( I c ) sampled values of the load current.