公开(公告)号：DE69718435D1

公开(公告)日：2003-02-20

申请号：DE69718435

申请日：1997-02-07

Applicant: ST MICROELECTRONICS SRL

Inventor： ZAFARANA ALESSANDRO ,  COCETTA FRANCO ,  MERLO MAURO

IPC: H02M3/156 ,  H02P9/30 ,  H03K5/08

Abstract: The invention relates to a voltage regulator of the type comprising a linear filter (2), a comparator (3), and a stretcher filter (4) which are connected in cascade with one another between an input terminal (I1) and an output terminal (O1) of the regulator (1), the input terminal (I1) receiving an error signal (ERR) as converted by the comparator (3) into a square-wave error signal (ERRq), and the output terminal (O1) delivering a square-wave output control signal (Sout) which has a stretched duty cycle over the square-wave error signal (ERRq) by a time delay (tA) introduced from the stretcher filter (4). The regulator of this invention further comprises a non-linear filtering section (5) for the error signal (ERR) which is connected between the input terminal (I1) of the regulator (1) and the linear filter (2) and has linear gain with the error signal (ERR) below a first value (X1), gain approximately of unity with the error signal (ERR) between the first value (X1) and a second value (X2), and zero gain with the error signal (ERR) above the second value (X2). The invention also concerns a method for filtering a noisy electric signal.

公开(公告)号：DE69322853T2

公开(公告)日：1999-05-27

申请号：DE69322853

申请日：1993-04-30

Applicant: ST MICROELECTRONICS SRL

Inventor： ROSSI GIORGIO ,  COCETTA FRANCO ,  MARCHIO FABIO

IPC: H01L27/04 ,  H01L21/822 ,  H01L23/58 ,  H03K17/082 ,  H03K17/14 ,  H03K17/16 ,  H03K17/687 ,  G05F1/00 ,  H03K17/08

Abstract: A circuit for recycling the discharge current of an inductive load being driven, comprising an active semiconductor device (T) connected serially with the inductive load (L) between first and second terminals of a voltage supply source and having a control terminal for connection to a driver circuit means (C), and a control circuit means (R1,R2,COMP) connected between the inductive load and said control terminal. The control circuit means comprises a voltage divider (R1,R2) connected between the inductive load (L) and the first terminal of the voltage supply source, and a comparator (COMP) having first and second input terminals respectively connected to the voltage divider and to a voltage reference and an output terminal which is coupled to the control terminal of the active element (T).

公开(公告)号：DE69322853D1

公开(公告)日：1999-02-11

申请号：DE69322853

申请日：1993-04-30

Applicant: ST MICROELECTRONICS SRL

Inventor： ROSSI GIORGIO ,  COCETTA FRANCO ,  MARCHIO FABIO

IPC: H01L27/04 ,  H01L21/822 ,  H01L23/58 ,  H03K17/082 ,  H03K17/14 ,  H03K17/16 ,  H03K17/687 ,  G05F1/00 ,  H03K17/08

Abstract: A circuit for recycling the discharge current of an inductive load being driven, comprising an active semiconductor device (T) connected serially with the inductive load (L) between first and second terminals of a voltage supply source and having a control terminal for connection to a driver circuit means (C), and a control circuit means (R1,R2,COMP) connected between the inductive load and said control terminal. The control circuit means comprises a voltage divider (R1,R2) connected between the inductive load (L) and the first terminal of the voltage supply source, and a comparator (COMP) having first and second input terminals respectively connected to the voltage divider and to a voltage reference and an output terminal which is coupled to the control terminal of the active element (T).