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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.
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公开(公告)号：JPH07142974A
公开(公告)日：1995-06-02
申请号：JP11597294
申请日：1994-05-02
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
Abstract: PURPOSE: To make the operation and a threshold voltage of the circuit independent of temperature substantially so as to keep independency of temperature. CONSTITUTION: The circuit is configured with a transistor(TR) 102 connected in series with an inductive load 101 between 1st and 2nd terminals of a voltage application source and having a control terminal to be connected to a drive circuit 103 and with a control circuit 112 connected between the inductive load 101 and the control terminal. The control circuit 112 is made up of a voltage divider 111 connected between the inductive load 101 and the 1st terminal of the voltage supply source, and a comparator 106 having 1st and 2nd input terminals connected between the voltage divider 111 and a point of a reference voltage (VREF) and an output terminal connecting to the control terminal of the TR 102.
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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.
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公开(公告)号：DE69838973T2
公开(公告)日：2009-01-02
申请号：DE69838973
申请日：1998-05-29
Applicant: ST MICROELECTRONICS SRL
Inventor： GERVASI LUIGI , LECCE SERGIO , COCETTA FRANCO , MERLO MAURO
Abstract: The tensioning apparatus is destined for use with silk screens essentially constituted by a flat frame (10) on which a screen material (2) or sieve is arranged. It comprises means for fixing the screen material (2) peripherally on the frame (10), and means for tensioning, associated to the frame (10), which operate between the frame (10) and the screen material (2) in order to tension the screen material (2).
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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.
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Patent Agency Ranking
公开(公告)号：DE69838973D1
公开(公告)日：2008-02-21
申请号：DE69838973
申请日：1998-05-29
Applicant: ST MICROELECTRONICS SRL
Inventor： GERVASI LUIGI , LECCE SERGIO , COCETTA FRANCO , MERLO MAURO
Abstract: The tensioning apparatus is destined for use with silk screens essentially constituted by a flat frame (10) on which a screen material (2) or sieve is arranged. It comprises means for fixing the screen material (2) peripherally on the frame (10), and means for tensioning, associated to the frame (10), which operate between the frame (10) and the screen material (2) in order to tension the screen material (2).
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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
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.
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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
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.
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公开(公告)号：DE60025904D1
公开(公告)日：2006-04-20
申请号：DE60025904
申请日：2000-08-31
Applicant: ST MICROELECTRONICS SRL
Inventor： COCETTA FRANCO
Abstract: The invention relates to a switching regulator circuit (10) producing a varying reference voltage (Vr) with temperature, which circuit includes a band-gap generator (2) for supplying at a power stage through an error amplifier (4) and a comparator (5). To the error amplifier (4) is also applied a regulated voltage (Vs) which may be produced by the regulator itself. Advantageously, the regulator (10) comprises a plurality of band-gap generators (12) being all supplied by the regulated voltage (Vs) and input a fraction of the regulated voltage (Vs) through a voltage divider (6), the respective outputs of the band-gap generators (12) being connected to a logic network (11) which has an output connected to the power stage. The error amplifier and comparator are incorporated to each of the generators (12).
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公开(公告)号：DE69718435T2
公开(公告)日：2003-10-23
申请号：DE69718435
申请日：1997-02-07
Applicant: ST MICROELECTRONICS SRL
Inventor： ZAFARANA ALESSANDRO , COCETTA FRANCO , MERLO MAURO
Abstract: The invention relates to a voltage regulator of the type comprising a linear filter (2), a comparator (3), and a stretcher filter (4) which are connected in cascade with one another between an input terminal (I1) and an output terminal (O1) of the regulator (1), the input terminal (I1) receiving an error signal (ERR) as converted by the comparator (3) into a square-wave error signal (ERRq), and the output terminal (O1) delivering a square-wave output control signal (Sout) which has a stretched duty cycle over the square-wave error signal (ERRq) by a time delay (tA) introduced from the stretcher filter (4). The regulator of this invention further comprises a non-linear filtering section (5) for the error signal (ERR) which is connected between the input terminal (I1) of the regulator (1) and the linear filter (2) and has linear gain with the error signal (ERR) below a first value (X1), gain approximately of unity with the error signal (ERR) between the first value (X1) and a second value (X2), and zero gain with the error signal (ERR) above the second value (X2). The invention also concerns a method for filtering a noisy electric signal.
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