中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

72 records (took 0.027 seconds)

    12.
    发明专利
    未知

    公开(公告)号：DE69533308D1

    公开(公告)日：2004-09-02

    申请号：DE69533308

    申请日：1995-05-16

    Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

    Inventor： PULVIRENTI FRANCESCO ,  GARIBOLDI ROBERTO

    IPC: G01R19/165 ,  G01R31/02 ,  G05B19/042 ,  G05B19/05

    Abstract: The invention relates to a method for detecting an open load by means of a driver having at least one main power transistor (M10) connected to the load (L) and one auxiliary transistor (M11) connected in parallel with the main transistor (M10) between a first power supply voltage reference (Vs) and a second voltage reference (GND), the method providing a comparison between a first voltage (VIN1) present on a terminal (S10) connected to the load of the main transistor (M10) and a second voltage (VIN2) present on a terminal (S11) of the auxiliary transistor (M11). The invention also relates to a circuit for detecting an open load (L), in which the said method is implemented.

    13.
    发明专利
    未知

    公开(公告)号：DE69421083D1

    公开(公告)日：1999-11-11

    申请号：DE69421083

    申请日：1994-11-17

    Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

    Inventor： COLLETTI PAOLO ,  BONTEMPO GREGORIO ,  PULVIRENTI FRANCESCO ,  GARIBOLDI ROBERTO

    IPC: H01L27/04 ,  G05F1/573 ,  H01L21/822 ,  H01L29/78 ,  H02H7/00 ,  H03K17/08 ,  H02H9/02

    Abstract: The purpose of the present invention is to supply a method and a circuit simple and accurate enough to protect at least one transistor against exceeding a complex limit implying processing of multiple electrical quantities associated with said transistor. Since in many practical cases said complex limit corresponds to the product of at least two quantities, typically a current and a voltage, the circuit in accordance with the present invention generates electrical signals basically proportional to said quantities, multiplies them, compares the product with a reference signal corresponding to the limit placed on the transistor and acts on the transistor in such a way that said limit is not exceeded. Advantageously the multiplication of currents can be provided simply by means of connection in series of bipolar transistor junctions at which said currents are supplied to the respective emitters. In this case it is additionally advantageous to generate the reference signal by means of connection in series of the bipolar transistor junctions in such a manner as to have an analogous behaviour of the multiplier and the generator.

    CIRCUIT FOR DETECTING SIGNAL OF TWO FEEDING POWER SUPPLIES ON ONE TRANSMISSION LINE
    14.
    发明专利
    CIRCUIT FOR DETECTING SIGNAL OF TWO FEEDING POWER SUPPLIES ON ONE TRANSMISSION LINE 失效

    公开(公告)号：JP2000196509A

    公开(公告)日：2000-07-14

    申请号：JP31805599

    申请日：1999-11-09

    Applicant: ST MICROELECTRONICS SRL

    Inventor： PULVIRENTI FRANCESCO ,  BONTEMPO GREGORIO ,  PALUMBO GAETANO

    IPC: H04B3/54 ,  H02J13/00

    Abstract: PROBLEM TO BE SOLVED: To obtain a circuit that has a similar function to that of a known circuit with a simple configuration without the need of a synchronizing signal. SOLUTION: The signal detection circuit that constructs a detection signal of a 2-feeding power supplies and one transmission line to be a positive and a negative changes in at least one supply voltage on wiring of the transmission line is provided with a low pass filter 20 that applies a prescribed reference voltage V+ nearly equal to a voltage of a line selected in advance from two lines connected to the two lines of the transmission line at its filter output terminal, a 1st threshold comparator 21 that has a reference input terminal 27 and a threshold input terminal 29 connected respectively to the output terminal 18 of the filter 20 and the pre-selected line in the two lines, and a 2nd threshold comparator 22 that has a reference input terminal 28 and a threshold input terminal 30 respectively connected to the pre-selected line in the two lines and the output terminal of the filter 20. The detection circuit is configured comparatively simply and requires no synchronizing signal for its operation and needs only a very small area for the provision of an integrated circuit.

Patent Agency Ranking