公开(公告)号：US06795265B2

公开(公告)日：2004-09-21

申请号：US09877675

申请日：2001-06-08

申请人： Terence J. Murphy ,  Keith W. Malang ,  Larry G. Hutsell ,  Doug Martin

发明人： Terence J. Murphy ,  Keith W. Malang ,  Larry G. Hutsell ,  Doug Martin

IPC分类号： G11B5596

CPC分类号： H01L41/042

摘要： A piezo actuator drive circuit (40) adapted to operate in both a charge mode and a voltage mode. A low frequency compensation loop (44) is formed from a piezo actuator output (OUT6XP) of a driver (42) to the input thereof. The resulting closed loop system produces charge mode operation within a bandpass that can be tuned for desired operation. Below the bandpass turn on frequency (Fh) the closed loop system restores the piezo output (OUT6XP) to a defined DC voltage and compensates for any wandering effects, such as DC current mismatches in the closed loop configuration, such that the piezo output is centered around the desired DC operating point. The circuit is further provided with a DC restore feature in combination with the feedback which allows for a low frequency DC coupled path and thus allows for the DC positioning of the piezo in the charge mode to be changed. The DC restoring amplifier is used to compensate for offsets in the amplifier chain. The DC restore amplifier ensures the overall circuit is balanced and that the charge mode operation is maintained. The circuit is particularly adapted to drive a varying number of multiple piezo actuators.

摘要翻译： 一种适于在充电模式和电压模式下操作的压电致动器驱动电路（40）。 低频补偿回路（44）由驱动器（42）的压电致动器输出（OUT6XP）到其输入端形成。 所产生的闭环系统在可以调谐到期望的操作的带通内产生充电模式操作。 在带通开启频率（Fh）之下，闭环系统将压电输出（OUT6XP）恢复到定义的直流电压，并补偿任何漂移效应，如闭环配置中的直流电流失配，使得压电输出居中 围绕期望的直流工作点。 该电路还具有与反馈相结合的DC恢复特征，其允许低频DC耦合路径，从而允许改变充电模式中的压电体的DC定位。 直流恢复放大器用于补偿放大器链中的偏移。 直流恢复放大器确保整个电路平衡，并保持充电模式操作。 该电路特别适于驱动不同数量的多个压电致动器。

公开(公告)号：US6018431A

公开(公告)日：2000-01-25

申请号：US293622

申请日：1999-04-16

申请人： Lance R. Carlson ,  Larry G. Hutsell ,  Paul Ray Tomlinson

发明人： Lance R. Carlson ,  Larry G. Hutsell ,  Paul Ray Tomlinson

IPC分类号： G11B19/04 ,  G11B25/04 ,  G11B33/08 ,  G11B15/04

CPC分类号： G11B33/08 ,  G11B19/04 ,  G11B25/043

摘要： A disk drive system comprising a shock evaluator is disclosed. The shock evaluator includes a shock evaluation circuit and threshold logic and firmware that is capable of evaluating the level of physical shocks to the disk drive system. The shock evaluation circuit is capable of comparing the level of a physical shock to threshold shock values. The threshold logic and firmware is capable of periodically resetting the threshold shock values to account for the change in operating conditions experienced by the disk drive system. When the shock evaluator determines that a physical shock is present, communication between the read/write transducer and the disk is interrupted to prevent corruption of data stored on the disk.

摘要翻译： 公开了一种包括冲击评估器的磁盘驱动器系统。 冲击评估器包括一个能够评估磁盘驱动器系统的物理冲击水平的冲击评估电路和阈值逻辑和固件。 冲击评估电路能够比较物理冲击的水平与阈值冲击值。 阈值逻辑和固件能够周期性地重置阈值冲击值，以解决磁盘驱动器系统经历的操作条件的变化。 当冲击评估器确定存在物理冲击时，读/写换能器和磁盘之间的通信中断，以防止存储在磁盘上的数据损坏。

公开(公告)号：US5923487A

公开(公告)日：1999-07-13

申请号：US870178

申请日：1997-06-05

申请人： Lance R. Carlson ,  Larry G. Hutsell ,  Paul Ray Tomlinson

发明人： Lance R. Carlson ,  Larry G. Hutsell ,  Paul Ray Tomlinson

IPC分类号： G11B19/04 ,  G11B25/04 ,  G11B33/08 ,  G11B15/04

CPC分类号： G11B33/08 ,  G11B19/04 ,  G11B25/043

摘要： A disk drive system comprising a shock sensing circuit is disclosed. The shock sensing circuit includes a shock evaluation circuit and threshold logic and firmware that is capable of evaluating the level of physical shocks to the disk drive system. The shock evaluation circuit is capable of comparing the level of a physical shock to threshold shock values. The threshold logic and firmware is capable of periodically resetting the threshold shock values to account for the change in operating conditions experienced by the disk drive system. When the shock sensing circuit determines that a physical shock is present, communication between the read/write transducer and the disk is interrupted to prevent corruption of data stored on the disk.

摘要翻译： 公开了一种包括冲击感测电路的磁盘驱动器系统。 冲击检测电路包括能够评估磁盘驱动器系统的物理冲击水平的冲击评估电路和阈值逻辑和固件。 冲击评估电路能够比较物理冲击的水平与阈值冲击值。 阈值逻辑和固件能够周期性地重置阈值冲击值，以解决磁盘驱动器系统经历的操作条件的变化。 当冲击感测电路确定存在物理冲击时，读/写换能器和磁盘之间的通信中断，以防止存储在磁盘上的数据损坏。

公开(公告)号：US5610487A

公开(公告)日：1997-03-11

申请号：US245617

申请日：1994-05-19

申请人： Larry G. Hutsell

发明人： Larry G. Hutsell

IPC分类号： G05D3/12 ,  G11B5/596 ,  H02P3/00 ,  G11B5/55

CPC分类号： G05D3/12 ,  G11B5/59622 ,  G05B2219/41017 ,  G05B2219/41145 ,  G05B2219/42033 ,  G05B2219/45177

摘要： A servo system for controlling the position of a read/write head over a rotating data disk is disclosed. The servo system includes the addition of a compensation scheme to the feedback loop that causes the open loop gain of the servo to increase only in a very narrow spectrum of its operating bandwidth. In a preferred embodiment, the compensation takes the form of a second order digital filter combined with a proportional-integral-differential phase compensation filter in the feedback loop of an embedded servo system for a digital data disk drive.

摘要翻译： 公开了一种用于控制读/写头在旋转数据盘上的位置的伺服系统。 伺服系统包括向反馈回路添加补偿方案，使得伺服的开环增益仅在其工作带宽的非常窄的频谱范围内增加。 在优选实施例中，补偿采用与用于数字数据盘驱动器的嵌入式伺服系统的反馈回路中的比例积分微分相位补偿滤波器组合的二阶数字滤波器的形式。