公开(公告)号：IT1238305B

公开(公告)日：1993-07-12

申请号：IT2255189

申请日：1989-11-30

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： PALARA SERGIO

IPC: G01R19/165 ,  G01R31/02 ,  G01R31/26 ,  G05F3/22 ,  H03H

Abstract: The detection circuit of the current in an MOS type power transistor comprises a detection transistor (T2) connected with drain and gate in common to the power transistor (T1) and having characteristics such that the current (I2) flowing through it is equal to a fraction of the current (I1) flowing through power transistor (T1). Downstream from detection transistor (T2) there are arranged means (T6; T13) for comparing a first current (I3) equal to a fraction of the current (I2) flowing through detection transistor (T2) with a second reference current (Ig1) having a pre-set value and to produce a detection signal of the value of the current in power transistor (T1) in relation to the difference between said first current (I3) and the reference current (Ig1).

公开(公告)号：IT1229318B

公开(公告)日：1991-08-08

申请号：IT2034689

申请日：1989-05-02

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： RACITI SALVATORE ,  PALARA SERGIO

IPC: H01L29/73 ,  H01L21/331 ,  H01L27/02 ,  H01L27/06 ,  H01L29/732 ,  H03K17/082 ,  H01L

Abstract: The protection device (3) comprises automatic commutating means (QP1, QP2; QP3) interposed between the base of the transistor (Q2) to be protected and the collector of the power device (Q3, Q4) to cause a flow of current having a low voltage drop between said base and said collector when the collector voltage (Vc) falls below a predetermined value.

公开(公告)号：IT8922428A1

公开(公告)日：1991-05-17

申请号：IT2242889

申请日：1989-11-17

Applicant: SGS THOMSON MICROELECTRONICS S R L

Inventor： PALARA SERGIO ,  BAZZANO GAETANO

IPC: H01L21/331 ,  H01L20060101 ,  H01L21/822 ,  H01L29/73 ,  H01L27/02 ,  H01L27/04 ,  H01L27/06 ,  H01L27/082 ,  H01L29/732

公开(公告)号：IT8922551D0

公开(公告)日：1989-11-30

申请号：IT2255189

申请日：1989-11-30

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： PALARA SERGIO

IPC: G01R19/165 ,  G01R31/02 ,  G01R31/26 ,  G05F3/22 ,  H03H

Abstract: The detection circuit of the current in an MOS type power transistor comprises a detection transistor (T2) connected with drain and gate in common to the power transistor (T1) and having characteristics such that the current (I2) flowing through it is equal to a fraction of the current (I1) flowing through power transistor (T1). Downstream from detection transistor (T2) there are arranged means (T6; T13) for comparing a first current (I3) equal to a fraction of the current (I2) flowing through detection transistor (T2) with a second reference current (Ig1) having a pre-set value and to produce a detection signal of the value of the current in power transistor (T1) in relation to the difference between said first current (I3) and the reference current (Ig1).

公开(公告)号：IT8920346D0

公开(公告)日：1989-05-02

申请号：IT2034689

申请日：1989-05-02

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： RACITI SALVATORE ,  PALARA SERGIO

IPC: H01L29/73 ,  H01L21/331 ,  H01L27/02 ,  H01L27/06 ,  H01L29/732 ,  H03K17/082

Abstract: The protection device (3) comprises automatic commutating means (QP1, QP2; QP3) interposed between the base of the transistor (Q2) to be protected and the collector of the power device (Q3, Q4) to cause a flow of current having a low voltage drop between said base and said collector when the collector voltage (Vc) falls below a predetermined value.

公开(公告)号：IT8822952D0

公开(公告)日：1988-12-15

申请号：IT2295288

申请日：1988-12-15

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： PALARA SERGIO ,  MONACO PAOLO

IPC: H02P7/288 ,  H02M7/538 ,  H02P7/00 ,  H03K4/94 ,  H03K17/0812 ,  H03K17/16 ,  H03K17/687

Abstract: The generator of drive signals comprises a ramp generator (11) suitable for receiving a square waveform input signal and for converting it into an output signal variable between a lower level and an upper level with upward and downward ramps having a preset slope, a first comparator (21) with a non-inverting input connected to the output of said ramp generator (11) and an inverting input connected to a first reference signal source (23) and a second comparator (22) with an inverting input connected to the output of said ramp generator (11) and a non-inverting input connected to a second reference signal source (24).