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    24.
    发明专利
    未知

    公开(公告)号：DE60202436T2

    公开(公告)日：2006-05-04

    申请号：DE60202436

    申请日：2002-02-19

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GALBIATI EZIO ,  BOSCOLO MICHELE

    IPC: G11B5/55 ,  H02M7/5387 ,  H02P7/00 ,  H02P25/02

    Abstract: The present invention relates a Pulse Width Modulation (PWM)/linear driver for an electromagnetic load by a bridge circuit (15) of the type having a signal input (Vm, GND) and a signal output (OutM, OutP) and at least two conduction control inputs (C1, C2) for driving a voice coil motor (VCM) in a linear mode and in a pulse width modulation (PWM). The bridge circuit (15) is driven by a PWM converter (16) coupled to one (C1) of said two control inputs and by a linear amplifier (17) coupled to the other (C2) of said two control inputs.

    25.
    发明专利
    未知

    公开(公告)号：DE60112447D1

    公开(公告)日：2005-09-08

    申请号：DE60112447

    申请日：2001-10-31

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BOSCOLO MICHELE ,  BRAMBILLA MASSIMILIANO ,  GALBIATI EZIO

    IPC: G11B19/20 ,  H02P6/182 ,  H02P6/185 ,  H02P6/22 ,  H02P6/18

    Abstract: The present invention refers to a method for detecting the position of a rotor of a DC motor and to the relative circuit. According to an embodiment the method for detecting the position of a rotor of a DC motor (SM) with N phases having a plurality of windings (AV1, AV2, AV3), comprising the steps of: connecting at least two of said windings (AV1, AV2, AV3) between a first (Vcc) and a second (Gnd) prefixed voltage according to a first current path for a prefixed time (Tact); allowing the current stored in said two windings (AV1, AV2, AV3) to discharge through a second current path; comparing the voltage at the ends of one of said two windings (AV1, AV2, AV3) with a third prefixed voltage and providing a control signal when said voltage is smaller in absolute value than said third prefixed voltage; performing the above steps for each of the winding (AV1, AV2, AV3) couples of said motor (SM); detecting the position of said rotor on the base of the control signals obtained.

    26.
    发明专利
    未知

    公开(公告)号：DE60018163D1

    公开(公告)日：2005-03-24

    申请号：DE60018163

    申请日：2000-03-23

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GALBIATI EZIO ,  NESSI MAURIZIO ,  PALESTRA MARCO

    IPC: H02M7/5387

    Abstract: A feedback control circuit of the current in a load constituted by a winding in series to a current sensing resistor, coupled to a full-bridge output stage, an amplifier (SENSE_AMPL) coupled to the terminals of the sensing resistor, a controller fed with the output of the amplifier and with a voltage reference (VIN) and producing a correction signal, has a PWM converter for generating a pair of control signals (IN+, IN-) that comprises an up/down counter producing a count value and a logic circuitry that produces the complement to two of the correction signal. A pair of registers first (D_IN+) and second (D_IN-) are coupled to the outputs of the controller and of the logic circuitry. A first comparator (COMP_1) coupled to the outputs of the counter and of the first register (D_IN+) produces the first control signal (IN+) if the count signal exceeds the value stored in the first register (D_IN+) and a second comparator (COMP_2) coupled to the counter and to the second register (D_IN-), produces the second control signal (IN-) if the count signal overcomes the value stored in the second register (D_IN-).

    28.
    发明专利
    未知

    公开(公告)号：DE69728388D1

    公开(公告)日：2004-05-06

    申请号：DE69728388

    申请日：1997-08-11

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GALBIATI EZIO ,  SALINA ALBERTO

    IPC: G01R19/00 ,  H02M7/5387 ,  H02P6/28 ,  H02P25/034

    Abstract: The monitoring the current lowing through an inductive load driven through a bridge power stage in a PWM mode, by using a pair of complementary periodic reference signals and amplifying by a sensing amplifier the signal existing on of a current sensing resistor functionally connected in series with the load, for producing an amplified signal representative of the current in the load to be fed to an input of an error amplifier driving a power amplifier of said bridge stage, comprises sampling the signal output by the sensing amplifier with a Sample & Hold circuit comprising a sampling switch and a storing capacitor. The average value of the current in the load in monitored by sampling at an instant half way an active driving phase and at an instant half way a current recirculation phase by closing the switch with a synchronizing pulse that coincides with the half instant of said phases of operation. The synchronizing pulse is generated in coincidence with the peak and with the virtual zero crossing of said two reference periodic signals, outphased by 180 degrees. A two-input logic AND gate, combining said synchronizing pulse and a masking signal of a preestablished duration generated at every switching of said bridge stage may also be employed.

    29.
    发明专利
    未知

    公开(公告)号：ITMI20002176A1

    公开(公告)日：2002-04-09

    申请号：ITMI20002176

    申请日：2000-10-09

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BRAMBILLA MASSIMILIANO ,  NESSI MAURIZIO ,  GALBIATI EZIO

    IPC: G11B21/08 ,  G11B21/10 ,  H02P25/06 ,  H03F3/187 ,  H03F3/30

    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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