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    CIRCUIT FOR DETECTING SIGNAL OF TWO FEEDING POWER SUPPLIES ON ONE TRANSMISSION LINE
    2.
    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.

    CONTROL CIRCUIT OF ZERO-BIAS CURRENT LOW-SIDE DRIVER
    3.
    发明专利
    CONTROL CIRCUIT OF ZERO-BIAS CURRENT LOW-SIDE DRIVER 失效

    公开(公告)号：JPH0722851A

    公开(公告)日：1995-01-24

    申请号：JP9588194

    申请日：1994-04-09

    Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

    Inventor： MILAZZO PATRIZIA ,  BONTEMPO GREGORIO ,  ALZATI ANGELO

    IPC: H03F1/02 ,  H02M1/08 ,  H03F3/21 ,  H03K17/00 ,  H03K17/0412 ,  H03K17/687

    Abstract: PURPOSE: To turn steady current consumption to zero without losing characteristics by providing a control circuit with a switch for blocking a current from a discharge current oscillator having control node capacitance when a power transistor(TR) is in an OFF state. CONSTITUTION: When a power TR PW is in an OFF state, the gate voltage of a TR M5 is also reduced. In the case of a switch OFF phase, the resistance of the TR M5 is increased and mismatch between currents I1, I2 is generated. The generation of a mis-matching trouble can be removed by determining the dimensions of the TR M5 so that large mismatch is generated when the power TR PW is slipped out of the saturation. Thereby the TR M5 operates as a switch to be opened when the gate voltage of the power TR PW is dropped less than the threshold voltage of the TR M5 and turns off a branch I2. Consequently the speed characteristics of the current oscillator I2 and the switch M5 can be held.

    5.
    发明专利
    未知

    公开(公告)号：DE69811674T2

    公开(公告)日：2004-04-29

    申请号：DE69811674

    申请日：1998-11-09

    Applicant: ST MICROELECTRONICS SRL

    Inventor： PULVIRENTI FRANCESCO ,  BONTEMPO GREGORIO ,  PALUMBO GAETANO

    IPC: H04B3/54 ,  H02J13/00

    Abstract: A circuit for detecting signals present on a bifilar voltage-supply and signal-transmission line, in which the signals are constituted by positive and negative variations of the supply potential of at least one of the wires of the line (2), comprises: a low-pass filter (20) connected to the two wires of the line in order to supply, at an output terminal of the filter, a constant reference potential (V+) substantially equal to the supply potential of a preselected one of the two wires, a first threshold comparator (21) having a reference input terminal (27) and a threshold input terminal (29) connected, respectively, to the output terminal (18) of the filter (20) and to the preselected wire of the two wires, and a second threshold comparator (22) having a reference input terminal (28) and a threshold input terminal (30) connected, respectively, to the preselected wire of the two wires and to the output terminal (18) of the filter (20). The circuit is relatively simple, does not require synchronization signals, and can be formed as an integrated circuit, taking up a limited area.

    8.
    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.

    9.
    发明专利
    未知

    公开(公告)号：DE69319326T2

    公开(公告)日：1998-10-29

    申请号：DE69319326

    申请日：1993-04-09

    Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

    Inventor： BONTEMPO GREGORIO ,  MILAZZO PATRIZIA ,  ALZATI ANGELO

    IPC: H03K17/04 ,  H03K17/0412 ,  H03K17/16 ,  H03K17/687

    Abstract: The turn-off delay time of a low-side driver (output power transistor), may be independently reduced and eventually made identical to the turn-on delay time by employing an auxiliary current generator that may be controlled by the same switching signal that controls a current generator employed for discharging the control node of the low-side driver, in order to provide an augmented discharging current during a first phase of a turn-off process. The contribution to the capacitance discharge current provided by said third current generator is automatically interrupted by means responsive to the voltage present on the driving node of the low-side driver, when it approaches saturation.

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