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    11.
    发明专利
    未知

    公开(公告)号：ITTO910137D0

    公开(公告)日：1991-02-27

    申请号：ITTO910137

    申请日：1991-02-27

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： POLETTO VANNI ,  MORELLI MARCO ,  MURARI BRUNO

    IPC: G05F1/56 ,  G05F1/569 ,  G05F1/59 ,  H02J9/06

    Abstract: A voltage regulator (30) comprising a first power switch (16) connected between the input terminal (11) and output terminal (13); a storage condenser (21) connected to the input terminal via a one-way switch (18); a second power switch (19) connected between the condenser and the input terminal; and a regulating element (17) connected to the output terminal and driving the power switches (16, 19) in such a manner as to maintain the output voltage (Vo) constant. For better distributing electric and thermal stress and improving the reliability and working life of the regulator by reducing the interference caused by switching of the two power switches, a drive device (31) is provided between the regulating element (17) and the switches (16, 19), for detecting the input voltage (VA) and the voltage of the condenser (VA'), and keeping both switches on as long as the input voltage is above two given thresholds (VTH1, VTH2), turning off the second switch (19) when the input voltage is higher than the condenser voltage (VA > VA') and below the first threshold (VA

    12.
    发明专利
    未知

    公开(公告)号：IT1225609B

    公开(公告)日：1990-11-22

    申请号：IT8364988

    申请日：1988-07-20

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： MARCHIO' FABIO ,  MORELLI MARCO ,  TRICOLI FRANCESCO

    IPC: H01L27/06 ,  H01L21/8222 ,  H02P8/12 ,  H03K17/0814 ,  H03K17/16 ,  H03K17/64 ,  H02P

    Abstract: A circuit for recirculating the discharge current of an inductive load (L) driven from the high side of the supply at two different recirculation voltages which may be selected for implementing a slow or a fast recirculation of the current advantageously employs a single power element represented by an NPN transistor (Tr) functionally connected in parallel to the load. During a driving phase of the load a slow recirculation of the discharge current is implemented by delivering to the base of the recirculation NPN transistor a current (I) sufficient to keep it saturated. Upon switching off the load, when a fast recirculation of the discharge current through the recirculation NPN transistor (Tr) is desired, delivery of the saturating current to the base of the recirculation transistor is interrupted and the transistor remains conducting having a diode (D1) and a zener diode (Dz1) in opposition thereto connected in series between ground and the base of the recirculation NPN transistor (Tr) for permitting the recirculation at a voltage substantially equal to the sum of the voltage drop through the first diode (D1), the zener voltage and the base-emitter voltage of the recirculation NPN transistor (Tr).

    13.
    发明专利
    未知

    公开(公告)号：DE69226746D1

    公开(公告)日：1998-10-01

    申请号：DE69226746

    申请日：1992-09-14

    Applicant: SGS THOMSON MICROELECTRONICS ,  MAGNETI MARELLI SPA

    Inventor： POLETTO VANNI ,  MORELLI MARCO ,  POMA ALBERTO

    IPC: H03K17/08 ,  H02M1/00 ,  H02M1/38 ,  H03K17/082 ,  H03K17/66 ,  H03K17/16

    Abstract: The circuit includes two output terminals (OUT1, OUT2) for connection to the terminals of a load (L), first and second pairs of electronic power switches (Q1, Q4; Q2, Q3) which are connected between the output terminals (OUT1, OUT2) and the two poles of a direct-current voltage supply (Vs) so as to form an H-shaped structure with the load (L), and a driver circuit (C1, C2) for selectively making the electronic power switches of the first pair (Q1, Q4) of the second pair (Q2, Q3) order to cause a current to flow through the load (L) in one direction or the other respectively, and for preventing the electronic switches (Q1, Q3; Q2, Q4) which are connected between the same output terminal (OUT1; OUT2) and the two poles of the voltage supply (Vs) from conducting simultaneously.

    15.
    发明专利
    未知

    公开(公告)号：DE69219975T2

    公开(公告)日：1997-10-16

    申请号：DE69219975

    申请日：1992-09-17

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： PELLEGRINI FRANCO ,  MORELLI MARCO ,  CANCLINI ATHOS

    IPC: H01L27/04 ,  H01L21/822 ,  H01L27/02 ,  H01L27/06 ,  H01L29/78 ,  H03K17/08 ,  H03K19/003

    Abstract: In an anti-ESD protective structure, especially designed for pins destined to reach below ground and/or above supply voltages, includes a pair of Zener diodes or lateral NPN structures with a resistive connection between base and emitter, connected in opposition among each other between the pin to be protected and a grounded substrate of the integrated circuit. An amplifying effect on the leakage current which is drawn/injected through the pin by the protective structure caused by the triggering of an intrinsic parasitic transistor is effectively eliminated by connecting a biasing element, such as a forward biased junction, between the node of interconnection between the two Zener orlateral NPN structures and a node of the integrated circuit biased with a voltage sufficiently high as to ensure, under any condition, a reverse biasing of the base-emitter junction of the parasitic transistor.

    16.
    发明专利
    未知

    公开(公告)号：DE69210651T2

    公开(公告)日：1997-01-16

    申请号：DE69210651

    申请日：1992-02-25

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： POLETTO VANNI ,  MORELLI MARCO ,  MURARI BRUNO

    IPC: G05F1/56 ,  G05F1/569 ,  G05F1/59 ,  H02J9/06 ,  G05F1/595

    Abstract: A voltage regulator (30) comprising a first power switch (16) connected between the input terminal (11) and output terminal (13); a storage condenser (21) connected to the input terminal via a one-way switch (18); a second power switch (19) connected between the condenser and the input terminal; and a regulating element (17) connected to the output terminal and driving the power switches (16, 19) in such a manner as to maintain the output voltage (Vo) constant. For better distributing electric and thermal stress and improving the reliability and working life of the regulator by reducing the interference caused by switching of the two power switches, a drive device (31) is provided between the regulating element (17) and the switches (16, 19), for detecting the input voltage (VA) and the voltage of the condenser (VA'), and keeping both switches on as long as the input voltage is above two given thresholds (VTH1, VTH2), turning off the second switch (19) when the input voltage is higher than the condenser voltage (VA > VA') and below the first threshold (VA

    19.
    发明专利
    未知

    公开(公告)号：DE69009302D1

    公开(公告)日：1994-07-07

    申请号：DE69009302

    申请日：1990-06-08

    Applicant: SGS THOMSON MICROELECTRONICS

    Inventor： MORELLI MARCO ,  CAVALLI BRUNO ,  MARCHIO FABIO

    IPC: H01L27/04 ,  G05F1/10 ,  H01L21/822 ,  H01L27/06 ,  H02H3/20 ,  H02H9/04

    Abstract: The device for protection comprises a zener diode voltage limiter (1) having a breakdown voltage pre-set at a value (say, 30 volts) lower than the maximum value sustainable by the protected circuit (30) in the closed condition and a quenching circuit (20) having a pre-set lag controlled by each overvoltage impulse and suitable for disactivating said voltage limiter (1) and to control the opening of said protected circuit (30) with a time lag pre-set with respect to the start of each overvoltage impulse. In succession to said voltage limiter (1) there is introduced in addition a zener diode (10) with a higher breakdown voltage, say, equal to 110 volts, which allows the limitation to such a value of any overvoltages having a very low energy content superimposed over overvoltages having limited amplitude and long duration.

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