中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

18 records (took 0.044 seconds)

    Method and hardware system for driving stepper motor in feed-forward voltage mode
    1.
    发明专利
    Method and hardware system for driving stepper motor in feed-forward voltage mode 有权
    用于在前馈电压模式下驱动步进电机的方法和硬件系统

    公开(公告)号：JP2010268675A

    公开(公告)日：2010-11-25

    申请号：JP2010106511

    申请日：2010-05-06

    Applicant: Dora Spa ,  Stmicroelectronics Srl ,  エスティーマイクロエレクトロニクスエス.アール.エルSTMicroelectronics S.r.l. ,  ドラ エス.ピー.エー.

    Inventor： BAGARELLI FULVIO GIACOMO ,  MARANO VINCENZO ,  POLI ENRICO

    IPC: H02P8/00

    CPC classification number: H02P8/12 ,  H02P8/22

    Abstract: PROBLEM TO BE SOLVED: To suppress a phase current generated in winding of a stator over a full speed range of motor when driving a stepper motor in a voltage mode. SOLUTION: A method of driving a stepper motor in feed-forward voltage mode includes (A) a step of setting the amplitude of a sinusoidal phase voltage of the stepper motor to a predetermined value to rotate the stepper motor at a desired speed. The predetermined value is the sum of a back-electromotive force (BEMF) estimated via a function of the desired speed and a product of a desired amplitude of a phase current (Iphase) and an estimated absolute value of the impedance of the stepper motor. COPYRIGHT: (C)2011,JPO&INPIT

    Abstract translation: 要解决的问题：在电压模式下驱动步进电机时，抑制在电动机的全速范围内的定子绕组中产生的相电流。 解决方案：一种以前馈电压模式驱动步进电动机的方法包括（A）将步进电动机的正弦相电压的振幅设定为预定值的步骤，以使步进电动机以期望的速度旋转 。 预定值是通过期望速度的函数估计的反电动势（BEMF）和相电流（Iphase）的期望幅度与步进电动机的阻抗的估计绝对值的乘积之和。 版权所有（C）2011，JPO＆INPIT

    SYSTEM FOR DRIVING COLUMNS OF A LIQUID CRYSTAL DISPLAY
    2.
    发明申请
    SYSTEM FOR DRIVING COLUMNS OF A LIQUID CRYSTAL DISPLAY 审中-公开
    用于驱动液晶显示器的列的系统

    公开(公告)号：WO2004003882A8

    公开(公告)日：2004-06-03

    申请号：PCT/EP0306638

    申请日：2003-06-23

    Applicant: ST MICROELECTRONICS SRL ,  DORA SPA ,  PAPPALARDO SALVATORE ,  PULVIRENTI FRANCESCO ,  PRIVITERA SALVATORE ,  SALA LEONARDO

    Inventor： PAPPALARDO SALVATORE ,  PULVIRENTI FRANCESCO ,  PRIVITERA SALVATORE ,  SALA LEONARDO

    IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36

    CPC classification number: G09G3/3685 ,  G09G2330/021

    Abstract: The present invention refers to a system for driving columns of a liquid crystal display comprising a logic circuitry (10) operating in a supply path between a first (VDD) and a second (VSS) supply voltage in which the first supply voltage is (VDD) higher than the second supply voltage (VSS). The logic circuitry (10) is capable of generating starting from the first logic signals (LOW_FRAME, WHITE_PIX) in input second logic signals (CP, CN, CP_N, CN_N) in output whose value is equal to the first (VDD) or second (VSS) supply voltage. The device comprises two elevator devices (11, 12) coupled to the logic circuitry (10) and operating in a supply path between a third supply voltage (VLCD) greater than the first supply voltage (VDD) and the second supply voltage (VSS); the elevator devices (11, 12) are capable of raising the value of the second logic signals (CP, CN, CP_N, CN_N). The device also comprises a first (T11-T12) and a second (T13-T14) pair of transistors shaving different supply paths (VLCD-VA, VB-VSS) and having an output terminal (OUT) in common; the first (T11-T12) and the second (T13-T14) pair of transistors are connected to the elevator devices (11, 12) so as to determine the drive signal of a column. The device comprises turnoff circuitry (15) operating in a supply path between the third (VLCD) and the second supply voltage (VSS) and coupled to the two elevator devices (11, 12). The circuitry (15) is capable of keeping one of the two pairs of transistors (T11-T12, T13-T14) in a turnoff state in the period of time of a frame when the other of the two pairs of transistors (T11-T12, T13-T14) is in operative conditions.

    Abstract translation: 本发明涉及一种用于驱动液晶显示器的列的系统，其包括在第一（VDD）和第二（VSS）电源电压之间的供应路径中操作的逻辑电路（10），其中第一电源电压是VDD ）高于第二电源电压（VSS）。 逻辑电路（10）能够在输出中的输入第二逻辑信号（CP，CN，CP_N，CN_N）中的第一逻辑信号（LOW_FRAME，WHITE_PIX）开始产生，其输出值等于第一（VDD）或第二 VSS）电源电压。 该装置包括耦合到逻辑电路（10）并且在大于第一电源电压（VDD）的第三电源电压（VLCD）与第二电源电压（VSS）之间的电源路径中操作的两个电梯装置（11,12） ; 电梯设备（11,12）能够提高第二逻辑信号（CP，CN，CP_N，CN_N）的值。 该器件还包括一对共同提供不同电源路径（VLCD-VA，VB-VSS）并具有输出端（OUT）的第一（T11-T12）和第二（T13-T14） 第一（T11-T12）和第二（T13-T14）晶体管对连接到升降机装置（11,12）以确定列的驱动信号。 该装置包括在第三（VLCD）和第二电源电压（VSS）之间的供电路径中操作并耦合到两个电梯装置（11,12）的关断电路（15）。 当两个晶体管对（T11-T12）中的另一个晶体管（T11-T12）处于截止状态时，电路（15）能够保持两对晶体管（T11-T12，T13- ，T13-T14）处于操作状态。

    8.
    发明专利
    未知

    公开(公告)号：ITMI20021426A1

    公开(公告)日：2003-12-29

    申请号：ITMI20021426

    申请日：2002-06-27

    Applicant: ST MICROELECTRONICS SRL ,  DORA SPA

    Inventor： PULVIRENTI FRANCESCO ,  SALA LEONARDO ,  PRIVITERA SALVATORE ,  PAPPALARDO SALVATORE

    IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36

    Abstract: The present invention describes a system for driving rows of a liquid crystal display including at least one module for driving one single row of the liquid crystal display. The module includes an inverter operating in a supply path between a first and a second supply line of the system, where the first supply line includes a first switch for coupling the inverter to a first or to a second supply voltage and the second supply line includes a second switch for coupling the inverter to a third or to a fourth supply voltage. The inverter is driven by logic circuitry and provides a drive signal for one single row of the liquid crystal display.

Patent Agency Ranking