公开(公告)号：US07561369B2

公开(公告)日：2009-07-14

申请号：US11894873

申请日：2007-08-21

申请人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

发明人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency. Therefore, it is possible to effectively reduce a signal component of the target frequency (a periodic variation component included in the PES).

摘要翻译： 根据本发明的实施例提供一种驱动单元，其能够令人满意地执行定位控制，其中包括在有效控制的位置误差信号中的扰动分量。 根据一个实施例，驱动单元的误差信号发生器基于从磁盘读出的伺服数据产生位置误差信号（PES）。 假设PES中包含的周期性变化分量的频率是目标频率，则如果目标频率偏离数字滤波器的有效频率范围，则下采样器对PES进行下采样，然后将PES提供给 数字滤波器，使有效频率范围发生变化。 结果，在移动的有效频率范围内，设定改变单元可以控制数字滤波器的设定频率，使得设定频率跟随目标频率。 因此，有可能有效地降低目标频率的信号分量（包括在PES中的周期性变化分量）。

公开(公告)号：US20080297942A1

公开(公告)日：2008-12-04

申请号：US11894873

申请日：2007-08-21

申请人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

发明人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency. Therefore, it is possible to effectively reduce a signal component of the target frequency (a periodic variation component included in the PES).

摘要翻译： 根据本发明的实施例提供一种驱动单元，其能够令人满意地执行定位控制，其中包括在有效控制的位置误差信号中的扰动分量。 根据一个实施例，驱动单元的误差信号发生器基于从磁盘读出的伺服数据产生位置误差信号（PES）。 假设PES中包含的周期性变化分量的频率是目标频率，则如果目标频率偏离数字滤波器的有效频率范围，则下采样器对PES进行下采样，然后将PES提供给 数字滤波器，使有效频率范围发生变化。 结果，在移动的有效频率范围内，设定改变单元可以控制数字滤波器的设定频率，使得设定频率跟随目标频率。 因此，有可能有效地降低目标频率的信号分量（包括在PES中的周期性变化分量）。

公开(公告)号：US5701018A

公开(公告)日：1997-12-23

申请号：US391568

申请日：1995-02-21

申请人： Koumei Hanaoka ,  Naoki Sakurai ,  Mutsuhiro Mori

发明人： Koumei Hanaoka ,  Naoki Sakurai ,  Mutsuhiro Mori

IPC分类号： H01L25/07 ,  H01L29/739 ,  H01L29/861 ,  H02J7/00 ,  H01L29/74 ,  H01L29/76 ,  H01L31/111 ,  H02H7/122

CPC分类号： H01L29/7395 ,  H01L25/072 ,  H01L2224/48091 ,  H01L29/861 ,  H01L2924/1305 ,  H01L2924/13055 ,  H01L2924/13091 ,  H01L2924/30107 ,  H02J7/0029

摘要： The present invention provides a semiconductor device comprising, at least a pair of an insulated gate bipolar transistor, and a diode, both of which are in a reverse parallel connection with each other, wherein the resistivity of the base layer of the lowest impurity concentration in the diode is lower than that of the base layer of the lowest impurity concentration in the insulated gate bipolar transistor, and wherein a breakdown voltage of said insulated gate bipolar transistor at the time of switching from conduction state to blocking state is lower than a breakdown voltage of said insulated gate bipolar transistor and said diode at the time of blocking state.

摘要翻译： 本发明提供了一种半导体器件，其包括至少一对绝缘栅双极晶体管和二极管，它们都彼此反向并联连接，其中基极层的最低杂质浓度的电阻率 二极管低于绝缘栅双极晶体管中最低杂质浓度的基极层的二极管，并且其中在从导通状态切换到阻断状态时所述绝缘栅双极晶体管的击穿电压低于击穿电压 的所述绝缘栅双极晶体管和所述二极管。

公开(公告)号：US6144046A

公开(公告)日：2000-11-07

申请号：US902332

申请日：1997-07-29

申请人： Koumei Hanaoka ,  Naoki Sakurai ,  Mutsuhiro Mori

发明人： Koumei Hanaoka ,  Naoki Sakurai ,  Mutsuhiro Mori

IPC分类号： H01L25/07 ,  H01L29/739 ,  H01L29/861 ,  H02J7/00 ,  H01L29/74 ,  H01L29/76 ,  H01L31/111 ,  H02H7/122

CPC分类号： H01L29/7395 ,  H01L25/072 ,  H01L2224/48091 ,  H01L29/861 ,  H01L2924/1305 ,  H01L2924/13055 ,  H01L2924/13091 ,  H01L2924/30107 ,  H02J7/0029

摘要： An inverter apparatus constituted by one or more series connections of plural semiconductor devices each having a pair consisting of an insulated gate bipolar transistor, and a diode, both of which are in a reverse parallel connection with each other, wherein the resistivity of the base layer of the lowest impurity concentration in the diode is lower than that of the base layer of the lowest impurity concentration in the insulated gate bipolar transistor, and wherein a breakdown voltage of said insulated gate bipolar transistor at the time of switching from a conduction state to a blocking state is lower than a breakdown voltage of said insulated gate bipolar transistor and said diode at the time of the blocking state.

摘要翻译： 一种由多个半导体器件的一个或多个串联连接构成的逆变器装置，每个半导体器件具有由绝缘栅双极晶体管和二极管组成的对，它们都彼此反向并联连接，其中基极层的电阻率 二极管中最低杂质浓度的浓度低于绝缘栅双极型晶体管中最低杂质浓度的基底层，其中在从导通状态切换到所述绝缘栅双极型晶体管时，所述绝缘栅双极晶体管的击穿电压 阻塞状态低于阻塞状态时所述绝缘栅双极晶体管和所述二极管的击穿电压。