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1. 发明授权

US07092197B2 Rejection of power supply variations for gain error cancellation in pulse-width-modulated motor controllers 有权
标题翻译：抑制脉冲宽度调制电机控制器中增益误差消除的电源变化
公开(公告)号：US07092197B2
公开(公告)日：2006-08-15
申请号：US10881486
申请日：2004-06-30
申请人： Alaa Y. El-Sherif , Eugene F. Plutowski , Kevin W. Ziemer
发明人： Alaa Y. El-Sherif , Eugene F. Plutowski , Kevin W. Ziemer
IPC分类号： G11B21/02
CPC分类号： G11B5/556 , G11B5/022 , H02M7/5395 , H02M2001/0022 , H02M2001/0025 , H02P25/034 , H02P27/085 , H02P31/00 , H02P2209/09
摘要： A positioning driver (32) for a voice coil motor (22) in a disk drive system (10) is disclosed. Pulse-width-modulated prestage drivers (46) are coupled to power transistors (50) arranged in an “H” bridge for driving the voice coil motor (22), biased with a power supply voltage (VM). The pulse-width-modulated prestage drivers (46) drive the power transistors (50) according to a comparison between an error signal from an error amplifier (36) and a ramp clock signal (RMP) generated by a ramp clock generator (46). The ramp clock generator (46) includes a control circuit (68) that modulates the high and low limits of the ramp clock signal (RMP) in response to variations in the power supply voltage (VM). This modulation of the high and low limits compensates for variations in the gain of the power transistors (50) resulting from variations in the power supply voltage (VM). The control circuit (68) may also modulate the slope of the ramp clock signal (RMP) according to variations in the power supply voltage (VM), for example to maintain a constant frequency.
摘要翻译：公开了一种用于盘驱动系统（10）中的音圈马达（22）的定位驱动器（32）。脉冲宽度调制预驱动器（46）耦合到布置在“H”桥中的功率晶体管（50），用于驱动音圈电机（22），用电源电压（V SUB M >）。根据来自误差放大器（36）的误差信号和由斜坡时钟发生器（46）产生的斜坡时钟信号（RMP）之间的比较，脉宽调制预驱动器（46）驱动功率晶体管（50）。斜坡时钟发生器（46）包括控制电路（68），其响应于电源电压（V SUB M S）的变化来调制斜坡时钟信号（RMP）的上限和下限。上限和下限的这种调制补偿了由于电源电压（V SUB M）的变化而导致的功率晶体管（50）的增益变化。控制电路（68）还可以根据电源电压（V SUB M）的变化来调制斜坡时钟信号（RMP）的斜率，例如维持恒定的频率。

2. 发明授权

US06819072B2 Disk drive servo arm retract and spindle brake circuit 有权
标题翻译：磁盘驱动器伺服臂退回和主轴制动电路
公开(公告)号：US06819072B2
公开(公告)日：2004-11-16
申请号：US09817695
申请日：2001-03-26
申请人： Bertram J. White , Kevin W. Ziemer
发明人： Bertram J. White , Kevin W. Ziemer
IPC分类号： G05B1101
CPC分类号： G11B21/12 , G11B19/22
摘要： A spindle motor control circuit for controlling a motor; including a control circuit to control the motor during at least a low state, a pulse state and a high state, the motor braking during said low state, the control circuit receiving a flyback voltage from the motor during the pulse state and the control circuit receiving a reduced flyback voltage from the motor during the high state.
摘要翻译：一种用于控制电动机的主轴电动机控制电路; 包括在至少低状态，脉冲状态和高状态期间控制电动机的控制电路，在所述低状态期间电动机制动，控制电路在脉冲状态期间接收来自电动机的回扫电压，并且控制电路接收在高电平期间来自电动机的反激电压降低。

3. 发明授权

US06535035B2 Driver and method for switching applications 有权
公开(公告)号：US06535035B2
公开(公告)日：2003-03-18
申请号：US10003772
申请日：2001-11-15
申请人： Kevin W. Ziemer
发明人： Kevin W. Ziemer
IPC分类号： H03K512
CPC分类号： G11B19/20
摘要： A predriver receives control information and provides an output signal for implementing control of an associated power switch device. The control information triggers a change in the output signal, such as from a first generally stable level to a second generally stable level. During the change in the output signal, the predriver operates in at least two transitional modes to control the output signal. The different transitional modes, for example, cause the output signal of the predriver to change at different rates. An associated pair of high side and low side predrivers further can be implemented in combination with a set of respective high side and low side power switches so as to form a driver.

4. 发明授权

US06995537B1 Closed-loop control system to mitigate PWM switching noise 有权
标题翻译：闭环控制系统，以减轻PWM开关噪声
公开(公告)号：US06995537B1
公开(公告)日：2006-02-07
申请号：US11057511
申请日：2005-02-14
申请人： Eugene Francis Plutowski , Kevin W. Ziemer , Alaa Y. El-Sherif
发明人： Eugene Francis Plutowski , Kevin W. Ziemer , Alaa Y. El-Sherif
IPC分类号： H02P7/00 , G11B15/52
CPC分类号： G11B5/5565 , H02P25/034
摘要： One aspect of the present invention provides a motor control system that includes a linear control system operative, in a linear mode, to provide a plurality of control signals for driving an associated motor based on an error signal. The system also includes control logic operative, in a pulse-width modulation (PWM) mode, to provide the plurality of control signals for driving the motor, at least some of the plurality of control signals being pulse-width-modulated signals based on the error signal. An error system generates the error signal based on an indication of a sensed electrical characteristic of the motor relative to a predetermined reference signal. A feedback network is coupled across the error system. The feedback configured to have transfer function characteristics that substantially match responses in the linear mode and the PWM mode of motor control system, which facilitates transitions between the linear mode and the PWM mode.
摘要翻译：本发明的一个方面提供一种电动机控制系统，其包括以线性模式操作的线性控制系统，以提供用于基于误差信号驱动相关电动机的多个控制信号。该系统还包括在脉冲宽度调制（PWM）模式中操作的控制逻辑，以提供用于驱动电动机的多个控制信号，多个控制信号中的至少一些是基于脉宽调制信号的脉冲宽度调制信号误差信号。错误系统基于相对于预定参考信号的感测到的电动机特性的指示产生误差信号。反馈网络跨错误系统耦合。反馈被配置为具有基本上匹配线性模式中的响应的传递函数特性和马达控制系统的PWM模式，这有助于线性模式和PWM模式之间的转换。

5. 发明授权

US06728084B2 System and method for overvoltage protection of an integrated circuit 有权
标题翻译：集成电路的过电压保护系统及方法
公开(公告)号：US06728084B2
公开(公告)日：2004-04-27
申请号：US10094200
申请日：2002-03-08
申请人： Kevin W. Ziemer , Fredrick W. Trafton , Alaa-Eldin Y. El-Sherif , Mehedi Hassan
发明人： Kevin W. Ziemer , Fredrick W. Trafton , Alaa-Eldin Y. El-Sherif , Mehedi Hassan
IPC分类号： H02H709
CPC分类号： H02H9/046
摘要： A protection system for an integrated circuit is disclosed. A detection system detects an overvoltage condition and provides an overvoltage condition signal to indicate a condition in which overvoltage protection may be desired. In response to the overvoltage condition signal, one or more variable resistance devices in the system, such as power devices of associated driver circuitry, are controlled to limit the voltage across such devices.
摘要翻译：公开了一种用于集成电路的保护系统。检测系统检测过电压状态，并提供过电压状态信号以指示可能期望过电压保护的状况。响应于过电压状态信号，系统中的一个或多个可变电阻器件（例如相关联的驱动器电路的功率器件）被控制以限制这些器件上的电压。

6. 发明授权

US06989955B2 Efficient transition from class D to linear operation in dual-mode voice coil motor controllers 有权
标题翻译：在双模音圈电机控制器中从D类到线性运行的高效转换
公开(公告)号：US06989955B2
公开(公告)日：2006-01-24
申请号：US10856542
申请日：2004-05-28
申请人： Kevin W. Ziemer , Alaa Y. El-Sherif , Gene Plutowski
发明人： Kevin W. Ziemer , Alaa Y. El-Sherif , Gene Plutowski
IPC分类号： G11B21/02
CPC分类号： G11B5/5547 , G11B5/022 , G11B5/59605
摘要： A dual-mode positioning driver for a voice coil motor in a disk drive system is disclosed. Linear prestage drivers and pulse-width-modulated prestage drivers are both coupled to power transistors arranged in an “H” bridge for driving the voice coil motor. The positioning driver is thus operable to drive the power transistors in either a linear mode or a pulse-width-modulated class D mode. In a transition period while switching from the pulse-width-modulated mode to linear mode, comparators compare the phase voltages in the “H” bridge with a reference voltage. The outputs of the comparators are applied to the PWM output amplifiers to drive the power transistors, so that the phase voltages are preconditioned toward their linear bias points. Discontinuities in the drive current through the voice coil motor are minimized as a result.
摘要翻译：公开了一种用于磁盘驱动器系统中的音圈电机的双模式定位驱动器。线性预驱动器和脉冲宽度调制的预驱动器都耦合到布置在“H”桥中的功率晶体管，用于驱动音圈电机。因此，定位驱动器可操作地以线性模式或脉冲宽度调制的D类模式驱动功率晶体管。在从脉冲宽度调制模式切换到线性模式的过渡期间，比较器将“H”桥中的相电压与参考电压进行比较。比较器的输出被施加到PWM输出放大器以驱动功率晶体管，使得相电压被预调节到它们的线性偏置点。结果，通过音圈电动机的驱动电流的不连续性被最小化。

7. 发明授权

US07130169B2 Short circuit protection for a power isolation device and associated diode 有权
公开(公告)号：US07130169B2
公开(公告)日：2006-10-31
申请号：US10119991
申请日：2002-04-10
申请人： Kevin W. Ziemer , Fredrick W. Trafton
发明人： Kevin W. Ziemer , Fredrick W. Trafton
IPC分类号： H02J1/04 , H02J9/06
CPC分类号： H02H11/003 , Y10T307/615 , Y10T307/62 , Y10T307/696 , Y10T307/724
摘要： Short circuit protection is provided for an isolation component that has a parasitic diode as an inherent part of its construction. The isolation component may or may not be contained in an integrated circuit. In response to detecting a short circuit condition based on voltages at one or more input terminals of the integrated circuit, or based on current between the terminals, the isolation component is activated to facilitate current flow through the isolation component, such as to reduce total power dissipation in the isolation component during at least part of the short circuit condition.

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