中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

9 records (took 0.023 seconds)

    LIMITER CIRCUIT
    3.
    发明专利
    LIMITER CIRCUIT 失效

    公开(公告)号：JPH07212156A

    公开(公告)日：1995-08-11

    申请号：JP23539794

    申请日：1994-09-29

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ROSSI GIORGIO ,  MARCHIO FABIO ,  LUONI LIANA ,  COCETTA FRANCO

    IPC: H03G11/00 ,  H03F1/52 ,  H03G11/02 ,  H03K17/082

    Abstract: PURPOSE: To decrease a voltage across an equalization capacitor, to accelerate a charging process, and to make a current limiting action proper by providing an uni-directional current energizing circuit between one terminal the equalization capacitor and the gate of a power MOS transistor. CONSTITUTION: When a voltage across a resistor Rs is increased, and allowed to reach the voltage of a reference power source Vr, a transistor TRQ5 is turned off. Then, a TrQ4 turns on a TrQ6 to draw more current from the base of the TrQ6. Some portion of current Ig is thus allowed to flow to the emitter of the TrQ6, the gate voltage of a power MOSTrMp is decreased, and load current I is decreased. At this time, a equalization capacitor C is not sufficiently charged, and the TrQ4 draws current from the base of the TrQ6, and the gate of the TrMp continues to draw current from a current source Ig while the TrQ6 is turned off, and increases the load current I. When an unidirectional current energizing circuit 2 is arranged at a prescribed position, the equalization capacitor C can be charged at a higher rate. Also, an amplifier 1 is properly interposed, and the current I is limited at an output terminal F.

    4.
    发明专利
    未知

    公开(公告)号：DE69322866D1

    公开(公告)日：1999-02-11

    申请号：DE69322866

    申请日：1993-09-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ROSSI GIORGIO ,  MARCHIO FABIO ,  LUONI LIANA ,  COCETTA FRANCO

    IPC: H03G11/00 ,  H03F1/52 ,  H03G11/02 ,  H03K17/082 ,  H03K17/08

    Abstract: The invention concerns a circuit for limiting the maximum current to be supplied to a load (Z) through a power Mos (Mp), being in particular of the regulated type using an equalizing capacitor (C). The addition of circuit means (2) with a one-way current flow between a terminal of said equalizing capacitor (C) and the gate terminal of (Mp) is effective to lower the voltage across the capacitor (C) and to speed up its charging process, thereby making the current limiting action expected from the circuit a timely one. The circuit means (2) may include a second Mos (M) of the same type as the power Mos (Mp). In this way, any deviations of (Mp) from its designed operation, as due to its manufacturing process and thermal drift phenomena, can be also compensated.

    5.
    发明专利
    未知

    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).

    6.
    发明专利
    未知

    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).

    7.
    发明专利
    未知

    公开(公告)号：DE69322866T2

    公开(公告)日：1999-05-20

    申请号：DE69322866

    申请日：1993-09-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ROSSI GIORGIO ,  MARCHIO FABIO ,  LUONI LIANA ,  COCETTA FRANCO

    IPC: H03G11/00 ,  H03F1/52 ,  H03G11/02 ,  H03K17/082 ,  H03K17/08

    Abstract: The invention concerns a circuit for limiting the maximum current to be supplied to a load (Z) through a power Mos (Mp), being in particular of the regulated type using an equalizing capacitor (C). The addition of circuit means (2) with a one-way current flow between a terminal of said equalizing capacitor (C) and the gate terminal of (Mp) is effective to lower the voltage across the capacitor (C) and to speed up its charging process, thereby making the current limiting action expected from the circuit a timely one. The circuit means (2) may include a second Mos (M) of the same type as the power Mos (Mp). In this way, any deviations of (Mp) from its designed operation, as due to its manufacturing process and thermal drift phenomena, can be also compensated.

    8.
    发明专利
    未知

    公开(公告)号：DE69518977T2

    公开(公告)日：2001-03-22

    申请号：DE69518977

    申请日：1995-06-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： MERLO MAURO ,  COCETTA FRANCO ,  MARCHIO FABIO ,  GRASSO MASSIMO ,  MURARI BRUNO

    IPC: G05F1/46 ,  G05F3/22 ,  H02J7/14

    Abstract: A reference voltage generator having a dual slope temperature characteristic, for use in an automotive alternator voltage regulator, comprises a bandgap circuit (R1,R2,R3,R4) which generates a voltage (A) having a thermal drift coefficient of zero and a voltage (B) having a non-zero thermal drift coefficient. These voltages are applied to a voltage divider (R5,R6) and a voltage-follower type of circuit (OPA1). A unidirectional conduction amplifier circuit (OPA2) has an input terminal connected to an intermediate point (C) on the voltage divider. A second voltage divider (R7,R8) is connected between the output terminals of the voltage-follower circuit (D) and the amplifier circuit (E). An intermediate node (F) of the second voltage divider is coupled to an output terminal (VREF) of the generator.

    9.
    发明专利
    未知

    公开(公告)号：DE69518977D1

    公开(公告)日：2000-11-02

    申请号：DE69518977

    申请日：1995-06-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： MERLO MAURO ,  COCETTA FRANCO ,  MARCHIO FABIO ,  GRASSO MASSIMO ,  MURARI BRUNO

    IPC: G05F1/46 ,  G05F3/22 ,  H02J7/14

    Abstract: A reference voltage generator having a dual slope temperature characteristic, for use in an automotive alternator voltage regulator, comprises a bandgap circuit (R1,R2,R3,R4) which generates a voltage (A) having a thermal drift coefficient of zero and a voltage (B) having a non-zero thermal drift coefficient. These voltages are applied to a voltage divider (R5,R6) and a voltage-follower type of circuit (OPA1). A unidirectional conduction amplifier circuit (OPA2) has an input terminal connected to an intermediate point (C) on the voltage divider. A second voltage divider (R7,R8) is connected between the output terminals of the voltage-follower circuit (D) and the amplifier circuit (E). An intermediate node (F) of the second voltage divider is coupled to an output terminal (VREF) of the generator.

Patent Agency Ranking