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公开(公告)号：DE69421083T2
公开(公告)日：2000-03-16
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
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.
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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
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.
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公开(公告)号：DE69421075T2
公开(公告)日：2000-03-02
申请号：DE69421075
申请日：1994-06-10
Applicant: CONS RIC MICROELETTRONICA
Inventor： BONTEMPO GREGORIO , PULVIRENTI FRANCESCO , COLLETTI PAOLO , GARIBOLDI ROBERTO
IPC: H02H3/08 , H03K17/082 , H03K17/284
Abstract: The invention relates to a non-dissipative device for protecting against overloading an integrated circuit having multiple independent channels, being of the type which comprises an input terminal (IN) and an output terminal (OUT) having an integrated switch (1) connected therebetween which consists of a first or input portion (2), a logic gate (PL1) with two inputs (I3,I4) a second or control portion (3), and a third or output portion (4), all in series with one another. The device further comprises a circuit (A) for generating the on- and off-times (Ton,Toff) of the integrated switch (1) connected between an output (O4) of the third portion (4) and an input terminal (I4) of said logic gate (PL1).
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公开(公告)号：DE69421075D1
公开(公告)日：1999-11-11
申请号：DE69421075
申请日：1994-06-10
Applicant: CONS RIC MICROELETTRONICA
Inventor： BONTEMPO GREGORIO , PULVIRENTI FRANCESCO , COLLETTI PAOLO , GARIBOLDI ROBERTO
IPC: H02H3/08 , H03K17/082 , H03K17/284
Abstract: The invention relates to a non-dissipative device for protecting against overloading an integrated circuit having multiple independent channels, being of the type which comprises an input terminal (IN) and an output terminal (OUT) having an integrated switch (1) connected therebetween which consists of a first or input portion (2), a logic gate (PL1) with two inputs (I3,I4) a second or control portion (3), and a third or output portion (4), all in series with one another. The device further comprises a circuit (A) for generating the on- and off-times (Ton,Toff) of the integrated switch (1) connected between an output (O4) of the third portion (4) and an input terminal (I4) of said logic gate (PL1).
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