公开(公告)号：JP2002223588A

公开(公告)日：2002-08-09

申请号：JP2001354965

申请日：2001-11-20

Applicant: ST MICROELECTRONICS SRL

Inventor： GALBIATI EZIO ,  NESSI MAURIZIO ,  SCHILLACI LUCA

IPC: G11B21/08 ,  H02P25/034 ,  H02P7/00

Abstract: PROBLEM TO BE SOLVED: To prevent collision of an arm for supporting a read and/or write head with the end of a stroke position of an inside or an outside of a platter having a hard disk. SOLUTION: A speed recovering circuit for a DC current motor comprises a second means 7, which is suitable to start a second set of transistors MOS3 and MOS4 of an output stage 1 during a first period Tbrk preset to short circuit the motor 2. In this case, the second means 7 is adapted, so as to set a maximum circulating current Ivcm during a prescribed second time period Tact of a function of the value detected by a first means 5 during the first time period Tbrk by setting an output stage 1 to an unbalanced state, when the first period Tbrk is finished and to stop the motor 2 in the shortest time possible.

公开(公告)号：DE60023014D1

公开(公告)日：2005-11-10

申请号：DE60023014

申请日：2000-11-20

Applicant: ST MICROELECTRONICS SRL

Inventor： GALBIATI EZIO ,  NESSI MAURIZIO ,  SCHILLACI LUCA

IPC: G11B21/08 ,  H02P25/034 ,  H02P7/00

Abstract: The present invention concerns a circuit for the speed recovery of a direct current motor comprising an output stage (1), consisting of a first couple of transistors (MOS1, MOS2) and of a second couple of transistors (MOS3, MOS4), and first means (5) for detecting a current circulating (Ivcm) in said motor. The inventive circuit has the characteristic of. comprising second means (7) suitable for activating said second couple of transistors (MOS3, MOS4) of said output stage (1) for a determined first time period (Tbrk) so as to short-circuit said motor (2), and at the end of said first time period (Tbrk) said second means (7) being suitable for unbalancing said output stage (1) so as to force the maximum current circulating (Ivcm) for a determined second time period (Tact) in function of the value detected by said first means (5) during said first time period (Tbrk) so as to stop said motor (2) in the shortest time possible.

公开(公告)号：ITMI20081632A1

公开(公告)日：2010-03-13

申请号：ITMI20081632

申请日：2008-09-12

Applicant: ST MICROELECTRONICS SRL

Inventor： NESSI MAURIZIO ,  SCHILLACI LUCA

公开(公告)号：ITMI20011996D0

公开(公告)日：2001-09-26

申请号：ITMI20011996

申请日：2001-09-26

Applicant: ST MICROELECTRONICS SRL

Inventor： NESSI MAURIZIO ,  SCHILLACI LUCA ,  SCRIVANI ALESSANDRO ,  SILVESTRI SIMONE

IPC: H03M1/48

Abstract: The present invention herein describes a tracking analog-to-digital converter, in particular of the differential input type. In an embodiment thereof the tracking analog-to-digital converter, having a differential analog input including a first analog input and a second analog input, and a digital output at a first number of bits comprising: a back and forth counter having a direction input and an output, with a second number of bits; a digital-to-analog converter having a data input coupled to said output of said converter, a reference input and an output, with a second number of bits; a first comparator having a positive input, a negative input coupled to said output of said digital-to-analog converter and an output coupled to said direction input; characterized in that said reference input is coupled to said first analog input and said positive input of said first comparator is coupled to said second analog input.

公开(公告)号：IT1392043B1

公开(公告)日：2012-02-09

申请号：ITMI20081632

申请日：2008-09-12

Applicant: ST MICROELECTRONICS SRL

Inventor： NESSI MAURIZIO ,  SCHILLACI LUCA

IPC: H03F3/45

公开(公告)号：DE60120907D1

公开(公告)日：2006-08-03

申请号：DE60120907

申请日：2001-03-15

Applicant: ST MICROELECTRONICS SRL

Inventor： SCHILLACI LUCA ,  NESSI MAURIZIO ,  GALBIATI EZIO

IPC: G11B21/08 ,  G11B5/55

公开(公告)号：ITMI20011996A1

公开(公告)日：2003-03-26

申请号：ITMI20011996

申请日：2001-09-26

Applicant: ST MICROELECTRONICS SRL

Inventor： NESSI MAURIZIO ,  SCHILLACI LUCA ,  SCRIVANI ALESSANDRO ,  SILVESTRI SIMONE

IPC: H03M1/48

Abstract: The present invention herein describes a tracking analog-to-digital converter, in particular of the differential input type. In an embodiment thereof the tracking analog-to-digital converter, having a differential analog input including a first analog input and a second analog input, and a digital output at a first number of bits comprising: a back and forth counter having a direction input and an output, with a second number of bits; a digital-to-analog converter having a data input coupled to said output of said converter, a reference input and an output, with a second number of bits; a first comparator having a positive input, a negative input coupled to said output of said digital-to-analog converter and an output coupled to said direction input; characterized in that said reference input is coupled to said first analog input and said positive input of said first comparator is coupled to said second analog input.