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公开(公告)号：IT1250830B
公开(公告)日：1995-04-21
申请号：ITTO910609
申请日：1991-07-31
Applicant: ST MICROELECTRONICS SRL
Inventor： BRAMBILLA MASSIMILIANO , MAGGIONI GIAMPIETRO
IPC: G01R31/02 , H03K17/082 , H03K
Abstract: A drive circuit fault detection device comprising an discriminating circuit (10) generating a digital signal, the level of which indicates a fault; and an identifying circuit (12) generating a binary-coded signal (F1, F2) indicating the type of fault, i.e. ground shorting of the drive circuit (1) or an open load (5). The discriminating circuit (10) comprises a resistive network (14) connected to the output (4) of the drive circuit (1), for generating a voltage (V1) indicating correct connection of the load (5) or a fault on the drive circuit (1); and a comparator (15) for comparing the aforementioned voltage with a reference value (VREF) and supplying the digital signal. The identifying circuit (12) comprises a current mirror circuit (28) generating an output voltage (V2) having two different logic levels in the event of short circuiting or an open load (5), the binary-coded output signal (F1, F2) being generated by a combination circuit (34-37).
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Patent Agency Ranking
公开(公告)号：IT1318988B1
公开(公告)日：2003-09-19
申请号：ITMI20002176
申请日：2000-10-09
Applicant: ST MICROELECTRONICS SRL
Inventor： BRAMBILLA MASSIMILIANO , NESSI MAURIZIO , GALBIATI EZIO
Abstract: A control circuit providing a driving current to a voice coil motor to position a reading and writing head of a disk memory system is described. The circuit comprises a first and a second class AB amplifiers the outputs of which are connected to the terminals of a first resistor in series with the voice coil motor so that a current passes through the voice coil motor and through the first resistor. The circuit comprises a sense amplifier the input terminals of which are coupled with the terminals of said first resistor, a device at the input of which is present a signal which is a sum of an external signal and of an output signal of the sense amplifier. The first amplifier and the second amplifier being driven in inverted phase by an output signal produced by the device. The circuit comprises means for inserting a second resistor in series with the first resistor so that said current passes through the series of said first and said second resistors and so that said sense amplifier has the input terminals coupled with the terminals of said series of resistors.
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公开(公告)号：ITMI20002176D0
公开(公告)日：2000-10-09
申请号：ITMI20002176
申请日：2000-10-09
Applicant: ST MICROELECTRONICS SRL
Inventor： BRAMBILLA MASSIMILIANO , NESSI MAURIZIO , GALBIATI EZIO
Abstract: A control circuit providing a driving current to a voice coil motor to position a reading and writing head of a disk memory system is described. The circuit comprises a first and a second class AB amplifiers the outputs of which are connected to the terminals of a first resistor in series with the voice coil motor so that a current passes through the voice coil motor and through the first resistor. The circuit comprises a sense amplifier the input terminals of which are coupled with the terminals of said first resistor, a device at the input of which is present a signal which is a sum of an external signal and of an output signal of the sense amplifier. The first amplifier and the second amplifier being driven in inverted phase by an output signal produced by the device. The circuit comprises means for inserting a second resistor in series with the first resistor so that said current passes through the series of said first and said second resistors and so that said sense amplifier has the input terminals coupled with the terminals of said series of resistors.
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公开(公告)号：DE69222587T2
公开(公告)日：1998-02-19
申请号：DE69222587
申请日：1992-07-15
Applicant: ST MICROELECTRONICS SRL
Inventor： BRAMBILLA MASSIMILIANO , MAGGIONI GIAMPIETRO
IPC: G01R31/02 , H03K17/082 , H03K17/08
Abstract: A drive circuit fault detection device comprising an discriminating circuit (10) generating a digital signal, the level of which indicates a fault; and an identifying circuit (12) generating a binary-coded signal (F1, F2) indicating the type of fault, i.e. ground shorting of the drive circuit (1) or an open load (5). The discriminating circuit (10) comprises a resistive network (14) connected to the output (4) of the drive circuit (1), for generating a voltage (V1) indicating correct connection of the load (5) or a fault on the drive circuit (1); and a comparator (15) for comparing the aforementioned voltage with a reference value (VREF) and supplying the digital signal. The identifying circuit (12) comprises a current mirror circuit (28) generating an output voltage (V2) having two different logic levels in the event of short circuiting or an open load (5), the binary-coded output signal (F1, F2) being generated by a combination circuit (34-37).
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公开(公告)号：DE69222587D1
公开(公告)日：1997-11-13
申请号：DE69222587
申请日：1992-07-15
Applicant: ST MICROELECTRONICS SRL
Inventor： BRAMBILLA MASSIMILIANO , MAGGIONI GIAMPIETRO
IPC: G01R31/02 , H03K17/082 , H03K17/08
Abstract: A drive circuit fault detection device comprising an discriminating circuit (10) generating a digital signal, the level of which indicates a fault; and an identifying circuit (12) generating a binary-coded signal (F1, F2) indicating the type of fault, i.e. ground shorting of the drive circuit (1) or an open load (5). The discriminating circuit (10) comprises a resistive network (14) connected to the output (4) of the drive circuit (1), for generating a voltage (V1) indicating correct connection of the load (5) or a fault on the drive circuit (1); and a comparator (15) for comparing the aforementioned voltage with a reference value (VREF) and supplying the digital signal. The identifying circuit (12) comprises a current mirror circuit (28) generating an output voltage (V2) having two different logic levels in the event of short circuiting or an open load (5), the binary-coded output signal (F1, F2) being generated by a combination circuit (34-37).
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公开(公告)号：ITTO910609D0
公开(公告)日：1991-07-31
申请号：ITTO910609
申请日：1991-07-31
Applicant: ST MICROELECTRONICS SRL , SGS THOMSON MICROELETRONICA S
Inventor： BRAMBILLA MASSIMILIANO , MAGGIONI GIAMPIETRO
IPC: G01R31/02 , H03K17/082
Abstract: A drive circuit fault detection device comprising an discriminating circuit (10) generating a digital signal, the level of which indicates a fault; and an identifying circuit (12) generating a binary-coded signal (F1, F2) indicating the type of fault, i.e. ground shorting of the drive circuit (1) or an open load (5). The discriminating circuit (10) comprises a resistive network (14) connected to the output (4) of the drive circuit (1), for generating a voltage (V1) indicating correct connection of the load (5) or a fault on the drive circuit (1); and a comparator (15) for comparing the aforementioned voltage with a reference value (VREF) and supplying the digital signal. The identifying circuit (12) comprises a current mirror circuit (28) generating an output voltage (V2) having two different logic levels in the event of short circuiting or an open load (5), the binary-coded output signal (F1, F2) being generated by a combination circuit (34-37).
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