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    System for increasing the definition in converting a digital datum in a PWM signal for driving a full-bridge output stage
    3.
    发明公开
    System for increasing the definition in converting a digital datum in a PWM signal for driving a full-bridge output stage 失效
    系统，用于提高分辨率的数字数据转换成PWM信号，用于控制全桥输出级

    公开(公告)号：EP0892500A1

    公开(公告)日：1999-01-20

    申请号：EP97830361.8

    申请日：1997-07-17

    Applicant: STMicroelectronics S.r.l.

    Inventor： Maiocchi, Giuseppe ,  Galbiati, Ezio

    IPC: H03M1/82 ,  H02M7/5387

    CPC classification number: H03M1/825 ,  H02M7/53873

    Abstract: The definition of conversion of a digital value in a PWM signal using an N-bit up/down counter is improved by increasing the dimension of the input datum to N+2 bits, using the two lsb of the N+2 input datum for selecting one among three intermediate levels between two consecutive values of an N-bit dynamic, according to a predefined table of combinations. The converter may still use an N-bit comparator.

    Abstract translation: 使用N位加/减计数器中的PWM信号的数字值的转换的定义是通过增加输入日期N + 2个比特的尺寸提高，使用两个LSB的N + 2输入的日期的用于选择 一个之中的N比特动态，gemäß的两个连续值之间的三个中间水平，以组合的预定义的表。 所述转换器可以关闭使用n位比较器的。

    Fully digital control and drive combo IC with on-board DSP for disk mass storage device
    4.
    发明公开
    Fully digital control and drive combo IC with on-board DSP for disk mass storage device 有权
    与完全数字化的集成电路内置数字信号处理器，用于控制和驱动盘的大容量存储设备

    公开(公告)号：EP1136998A1

    公开(公告)日：2001-09-26

    申请号：EP00830224.2

    申请日：2000-03-23

    Applicant: STMicroelectronics S.r.l.

    Inventor： Maiocchi, Giuseppe

    IPC: G11B19/20 ,  G11B19/28 ,  G11B21/02 ,  G11B5/54 ,  G11B5/56

    CPC classification number: G11B19/20 ,  G11B19/28 ,  G11B21/02

    Abstract: A combo device for driving and controlling a rotation motor and a voice coil motor of a disk mass storage drive comprises a digital signal processor carrying out a plurality of functions, a memory, a bank of input/output registers, memory address decoding circuits, a circuit controlling and driving a multiphase motor that rotates the disk, a timing block, an output stage driving a "voice coil" motor for positioning a swinging arm carrying at least a read/write head, controlled in switched mode by a generator (PSM GENERATOR) of two control phases of variable duty-cycle, a duty-cycle control loop comprising a current sensing circuit and a control loop of the position of said arm comprising a speed detection circuit. The two control loops are digitally implemented by the digital signal processor (DSP) in function of digital data representing the current flowing in the winding of the "voice coil" motor and of the instant speed of said "voice-coil" motor generated by the speed detection circuit.

    Abstract translation: 用于驱动和控制旋转电机和磁盘的大容量存储驱动器的音圈电机的组合设备包括进行的功能的多个，存储器，输入/输出寄存器一家银行，存储器地址解码电路，一个数字信号处理器 电路控制和驱动的多相电动机确实旋转盘，定时块，（在输出级驱动一“音圈”马达用于通过发电机PSM发生器定位的摆动臂承载至少一个读/写头，在切换模式来控制 ）可变占空比，占空比控制回路，包括电流感测电路和所述臂的包含速度检测电路的位置的控制回路的两个控制阶段。 两个控制回路被数字由数字信号处理器（DSP）中表示的“音圈”电动机的和的瞬时速度的绕组中流动的电流的数字数据的功能实现由所述生成的“音圈”马达 速度检测电路。

    Prevention of noise due to concurrent signals of H-bridge driving of a voice coil motor
    5.
    发明公开
    Prevention of noise due to concurrent signals of H-bridge driving of a voice coil motor 有权
    防止由于竞争信号紊乱的音圈电动机的H桥的控制

    公开(公告)号：EP1865505A1

    公开(公告)日：2007-12-12

    申请号：EP06425391.7

    申请日：2006-06-09

    Applicant: STMicroelectronics S.r.l.

    Inventor： Maiocchi, Giuseppe ,  Galbiati, Ezio ,  Boscolo Berto, Michele

    IPC: G11B15/18 ,  H02P7/00 ,  H02P6/08

    CPC classification number: G11B5/02 ,  G11B5/022 ,  G11B2005/001 ,  H02P25/034

    Abstract: Usually the control power signal lines of a positioning voice coil motor (VCM), driven in a PWM or PSM mode, and the relatively low power signal lines of a read/write (R/W) head runs parallel to each others along a unique flat cable that connects the VCM moved arm carrying the head to the related drive control and signal processing circuitries of a disk storage device. When controlling the VCM at relatively low current levels, both PSM drive signals approach the 50% duty cycle and therefore the PSM commutations become so close each others that may practically be considered concurrent. In these conditions of operation, switching energies sum and reach a level that may be sufficient to inject switching noise from the VCM power lines in adjacent low level signals lines of the connection flat cable.
    A way of preventing concurrent commutations of a pair of PSM drive signals of an output bridge stage driving a voice coil motor (VCM), consists in establishing a certain threshold level of programmed current to be forced the voice coil motor and when the level of the programmed current to be forced through the voice coil motor drops below said threshold, enhancing the time offset between commutation edges of the two PSM drive signals by a certain minimum time. This is accomplished either by phase shifting one of the signals from the other signal or by broadening the width of the pulses of one of the two PSM drive signals and by narrowing the width of the pulses of the other PSM drive signal, while maintaining constant the individual duty-cycle of each drive signal.

    Abstract translation: 通常在PWM或PSM方式驱动的定位的音圈电机（VCM），和一个读/写的相对低功率的信号线（R / W）磁头平行于彼此沿一个唯一的功率控制信号线 扁平电缆连接VCM并移动臂承载头到磁盘存储装置的相关驱动控制和信号处理电路系统。 当控制在相对较低的电流水平的VCM，这两个PSM驱动信号接近50％的占空比，因此PSM减刑变得如此接近eachothers也几乎可以被认为是并发的。 在操作中的合成条件，交换能量求和并达到一个电平都可以足以注入从在连接扁平电缆的相邻低电平的信号线的电力线VCM开关噪声。 防止一对输出桥级驱动的音圈电动机（VCM）的PSM驱动信号的同时换向，besteht在建立编程电流的某个阈值电平的方式被强制音圈电机和时的水平 编程电流通过音圈马达降到低于所述阈值被强制，从而增强时间由某最小时间两个PSM驱动信号的换向边缘之间的偏移量。 这是通过相移与其它信号的信号的一个或一个通过加宽两个PSM驱动信号中的一个的脉冲的宽度和通过缩小其它PSM驱动信号的脉冲的宽度来实现无论哪种，同时保持恒定的 每个驱动信号的各个占空比。

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