公开(公告)号：US06462496B1

公开(公告)日：2002-10-08

申请号：US09447508

申请日：1999-11-23

Applicant: Mehedi Hassan ,  Fredrick W. Trafton ,  Bert J. White ,  Vincent T. Ng

Inventor： Mehedi Hassan ,  Fredrick W. Trafton ,  Bert J. White ,  Vincent T. Ng

IPC: G05B1101

CPC classification number: G11B19/28 ,  H02P6/28

Abstract: A control circuit for motor current including a circuit to generate a voltage to indicate the actual motor current, a first convert circuit to convert the voltage indicative of the motor current to a current, a compare circuit to compare the current indicating the motor current with a reference current and generate a difference current between the current indicating the motor current and the reference current, and a second convert circuit to convert the difference current to a voltage to indicate a difference in motor current from the reference current.

Abstract translation: 一种用于电动机电流的控制电路，包括产生用于指示实际电动机电流的电压的电路，将表示电动机电流的电压转换为电流的第一转换电路，将比较电动机电流的电流与 并产生指示电动机电流的电流与参考电流之间的差电流;以及第二转换电路，用于将差动电流转换成电压，以指示电动机电流与参考电流的差。

公开(公告)号：US06614255B2

公开(公告)日：2003-09-02

申请号：US09683661

申请日：2002-01-31

Applicant: Mehedi Hassan

Inventor： Mehedi Hassan

IPC: G01R3134

CPC classification number: G01R31/31937 ,  G01R31/005 ,  G01R31/007

Abstract: A circuit combination (16,86) is presented for providing digital signals indicative of slew rates of drive signals (112,140) provided to H-bridge power drive transistors (60,62,64) of motor windings (66) of a mass data storage device (10). The circuit combination includes a plurality of predriver circuits (53-55) producing predrive signals according to a commutation sequence for connection to respective the power drive transistors (60,62,64). A multiplexer (40) is connected to selectively direct at least some of the drive signals to a multiplexer output port, and a digital comparison circuit (86) receives the at least some drive signals from the multiplexer output port and produces a digital outputs (120,158) having state time changes in dependence upon rise and fall times of the predriver output signals.

Abstract translation: 电路组合（16,86）用于提供指示提供给大容量数据存储器的电机绕组（66）的H桥功率驱动晶体管（60,62,64）的驱动信号（112,140）的转换速率的数字信号 装置（10）。 电路组合包括多个预驱动电路（53-55），其根据用于连接到相应的功率驱动晶体管（60,62,64）的换向序列产生预驱动信号。 多路复用器（40）被连接以选择性地将至少一些驱动信号引导到复用器输出端口，并且数字比较电路（86）从多路复用器输出端口接收至少一些驱动信号并产生数字输出（120,158 ）具有依赖于预驱动输出信号的上升和下降时间的状态时间变化。

公开(公告)号：US20050110444A1

公开(公告)日：2005-05-26

申请号：US10720809

申请日：2003-11-24

Applicant: Mehedi Hassan ,  Gregory Swize

Inventor： Mehedi Hassan ,  Gregory Swize

IPC: G11B15/18 ,  G11B17/00 ,  G11B19/00 ,  G11B19/02 ,  H02P3/14 ,  H02P3/18

CPC classification number: G11B19/00 ,  H02P3/18

Abstract: A hard disk drive energy recovery circuit, a method of recovering energy from a motor of a hard disk drive and a hard disk drive. In one embodiment, the hard disk drive energy recovery circuit includes (1) a spindle resolver that generates transition signals as a spindle motor of the hard disk drive rotates among angular regions, (2) a spindle region state machine, coupled to the spindle resolver, that receives the transition signals and generates rectifier drive signals based thereon and (3) a synchronous rectifier, coupled to the spindle region state machine, that employs the rectifier drive signals to recover electrical energy from the motor.

公开(公告)号：US20050078400A1

公开(公告)日：2005-04-14

申请号：US10680933

申请日：2003-10-08

Applicant: Mehedi Hassan

Inventor： Mehedi Hassan

IPC: G11B5/54 ,  G11B21/02 ,  G11B21/12

CPC classification number: G11B21/12 ,  G11B5/54

Abstract: An apparatus, method and system for retracting a read/write head (13) to a landing position of a disk (11) in a disk drive system (10) which includes an actuator (33) coupled with the head (13) for retracting in a first direction toward an outside diameter of the disk (11) and a second direction toward an inside diameter of the disk (11) in response to corresponding signals. A control device (32) coupled with the actuator (33) which is adapted for determining a retract direction for the read/write head (13), wherein a first signal indicative of a first direction and a second signal indicative of a second direction is provided to the actuator (33), the control device (32) further providing the first signal following a loss of power which energizes the disk drive motor (38) of the disk drive system and providing the second signal subsequent to providing the first signal for retracting the read/write head (13) to the landing position.

Abstract translation: 一种用于将读/写头（13）缩回到盘驱动系统（10）中的盘（11）的着陆位置的装置，方法和系统，其包括与头部（13）联接的致动器（33），用于收回 沿着朝向盘（11）的外径的第一方向和朝向盘（11）的内径的第二方向响应于相应的信号。 与所述致动器（33）耦合的控制装置（32），其适于确定所述读/写头（13）的缩回方向，其中指示第一方向的第一信号和指示第二方向的第二信号是 提供给致动器（33）的情况下，控制装置（32）进一步提供第一信号，在功率损失之后，对磁盘驱动系统的磁盘驱动电机（38）进行激励，并且在提供第一信号之后提供第一信号， 将读/写头（13）缩回到着陆位置。

公开(公告)号：US5850195A

公开(公告)日：1998-12-15

申请号：US625611

申请日：1996-03-29

Applicant: John H. Berlien, Jr. ,  Cecil J. Aswell ,  Eugene G. Dierschke ,  Mehedi Hassan

Inventor： John H. Berlien, Jr. ,  Cecil J. Aswell ,  Eugene G. Dierschke ,  Mehedi Hassan

IPC: H03M1/12 ,  H03M1/00 ,  G08C19/04

CPC classification number: H03M1/129 ,  G01J1/46 ,  H03M1/60

Abstract: A monolithic light-to-digital signal converter (1.10) includes a photodiode array (1.24) having a plurality of sections with each section producing a current signal in response to incident light, a current-to-digital signal converter circuit (1.28) for converting selected ones of the current signals to a digital signal, and a control circuit (1.26) for scaling the digital signal in response to user supplied programming signals. The control circuit (1.26) also responds to user supplied programming signals to supply control signals to current-to-digital signal converter circuit (1.28). Current-to-digital signal converter circuit (1.28) is responsive to the control signals for combining selected ones of the current signals into a composite current signal and converting the composite current signal to a digital signal.

Abstract translation: 单片光数字信号转换器（1.10）包括具有多个部分的光电二极管阵列（1.24），每个部分响应于入射光而产生电流信号;电流 - 数字信号转换器电路（1.28），用于 将所选择的当前信号转换为数字信号，以及用于响应于用户提供的编程信号对数字信号进行缩放的控制电路（1.26）。 控制电路（1.26）还响应用户提供的编程信号，将控制信号提供给电流 - 数字信号转换器电路（1.28）。 电流 - 数字信号转换器电路（1.28）响应于用于将选定电流信号组合成复合电流信号的控制信号，并将复合电流信号转换为数字信号。

公开(公告)号：US06940675B2

公开(公告)日：2005-09-06

申请号：US10720809

申请日：2003-11-24

Applicant: Mehedi Hassan ,  Gregory Emil Swize

Inventor： Mehedi Hassan ,  Gregory Emil Swize

IPC: G11B15/18 ,  G11B17/00 ,  G11B19/00 ,  G11B19/02 ,  H02P3/14 ,  H02P3/18

CPC classification number: G11B19/00 ,  H02P3/18

Abstract: A hard disk drive energy recovery circuit, a method of recovering energy from a motor of a hard disk drive and a hard disk drive. In one embodiment, the hard disk drive energy recovery circuit includes (1) a spindle resolver that generates transition signals as a spindle motor of the hard disk drive rotates among angular regions, (2) a spindle region state machine, coupled to the spindle resolver, that receives the transition signals and generates rectifier drive signals based thereon and (3) a synchronous rectifier, coupled to the spindle region state machine, that employs the rectifier drive signals to recover electrical energy from the motor.

Abstract translation: 一种硬盘驱动器能量回收电路，一种从硬盘驱动器和硬盘驱动器的电动机中恢复能量的方法。 在一个实施例中，硬盘驱动器能量恢复电路包括（1）主轴分解器，其在硬盘驱动器的主轴电动机在角区域之间旋转时产生转换信号，（2）主轴区域状态机，与主轴分解器 ，其接收转换信号并基于此产生整流器驱动信号，以及（3）耦合到主轴区域状态机的同步整流器，其采用整流器驱动信号来从电动机恢复电能。

公开(公告)号：US06721119B1

公开(公告)日：2004-04-13

申请号：US09640214

申请日：2000-08-16

Applicant: Mehedi Hassan ,  Joao Carlos Brito ,  John K. Rote

Inventor： Mehedi Hassan ,  Joao Carlos Brito ,  John K. Rote

IPC: G11B2102

CPC classification number: G11B19/20 ,  G11B5/5526 ,  G11B21/12

Abstract: A system and method are provided for controlling operation of an actuator for retracting a read/write head of a hard disk drive system. One aspect of the system and method relates to controlling the actuator in response to a retract request command by first decelerating the actuator for a time period and then braking of the actuator for another time period. Another aspect of the system and method relates to controlling operation of the actuator during retract based on a sensed back EMF relative to a target back EMF, which may be selected by a user.

Abstract translation: 提供了一种用于控制用于缩回硬盘驱动器系统的读/写头的致动器的操作的系统和方法。 该系统和方法的一个方面涉及通过首先使致动器减速一段时间，然后再次制动致动器另一时间段来响应于回缩请求命令来控制致动器。 该系统和方法的另一方面涉及基于相对于目标反电动势的感测的反电动势来控制在缩回期间致动器的操作，其可以由用户选择。

公开(公告)号：US06369618B1

公开(公告)日：2002-04-09

申请号：US09490652

申请日：2000-01-24

Applicant: Bryan E. Bloodworth ,  Davy H. Choi ,  Mehedi Hassan

Inventor： Bryan E. Bloodworth ,  Davy H. Choi ,  Mehedi Hassan

IPC: H02M1100

CPC classification number: G05F1/562

Abstract: A voltage to current conversion circuit is described. The circuit comprises a first differential amplifier for receiving an input voltage and producing an output voltage, and a second amplifier for converting the output voltage of the first amplifier to a current. The transfer function of the voltage to current conversion circuit is proportional to an exponential function that depends on the input voltage. The circuit is temperature and process independent. In a first preferred embodiment, the first amplifier comprises a first transistor for receiving an input voltage at its base terminal, a temperature dependent current source coupled to the emitter of the first transistor, and a positive voltage supply coupled to the collector through a diode coupled transistor, and a second transistor paired with the first transistor and having a base terminal coupled to an input voltage terminal, an emitter coupled to a temperature dependent current source, and a collector coupled to a voltage supply. The output voltage is a differential signal taken from the collector terminals to the second amplifier, which comprises a third transistor coupled to a fixed current source, the base terminal for receiving the voltage output of the first amplifier, and an emitter coupled to a fourth transistor's emitter, the fourth transistor receiving the output voltage of the first stage at its base terminal, and the collector providing an output terminal. A feedback circuit is coupled to the emitters of the transistors of the third and fourth circuits and to the collector of a fifth transistor, the feedback circuit providing negative feedback to limit the current available at the output when the current through the feedback circuit exceeds a predetermined limit.

Abstract translation: 描述电压 - 电流转换电路。 该电路包括用于接收输入电压并产生输出电压的第一差分放大器和用于将第一放大器的输出电压转换为电流的第二放大器。 电压到电流转换电路的传递函数与取决于输入电压的指数函数成比例。 电路是温度和工艺独立的。 在第一优选实施例中，第一放大器包括用于在其基极端接收输入电压的第一晶体管，耦合到第一晶体管的发射极的与温度相关的电流源，以及通过耦合到二极管的二极管耦合到集电极的正电压源 晶体管和与第一晶体管配对的第二晶体管，并且具有耦合到输入电压端子的基极端子，耦合到温度依赖性电流源的发射极和耦合到电压源的集电极。 输出电压是从集电极端子到第二放大器的差分信号，其包括耦合到固定电流源的第三晶体管，用于接收第一放大器的电压输出的基极端子和耦合到第四晶体管的发射极 发射极，第四晶体管在其基极端接收第一级的输出电压，集电极提供输出端。 反馈电路耦合到第三和第四电路的晶体管和第五晶体管的集电极的发射极，反馈电路提供负反馈以限制当通过反馈电路的电流超过预定值时在输出处可用的电流 限制。

公开(公告)号：US5821717A

公开(公告)日：1998-10-13

申请号：US872464

申请日：1997-06-10

Applicant: Mehedi Hassan ,  Robert E. Whyte ,  James E. Chloupek

Inventor： Mehedi Hassan ,  Robert E. Whyte ,  James E. Chloupek

IPC: H02P29/00 ,  G05B11/28 ,  G11B19/28 ,  H02P6/00 ,  H02P27/06 ,  G05B11/01

CPC classification number: G05B11/28 ,  G11B19/28 ,  H02P6/28

Abstract: A system for driving a hard disk drive spindle motor is disclosed. The system comprises a spindle motor control circuit (120) and a spindle motor power circuit (220). The system also includes at least one disk (22) attached to a rotatable spindle (21) and a spindle motor (400) which receives power signals from the spindle motor power circuit (220) and controls the rotation of the spindle (21). The spindle motor control circuit (120) comprises a multiplexor (127) which transmits either a pulse width modulation signal or a current control signal in response to a mode selection signal, and a spindle predriver (125) which receives the multiplexor output signal and transmits spindle motor control signals to the spindle motor power circuit (220).

Abstract translation: 公开了一种用于驱动硬盘驱动器主轴电动机的系统。 该系统包括主轴电机控制电路（120）和主轴电机功率电路（220）。 该系统还包括附接到可旋转主轴（21）的至少一个盘（22）和主轴电动机（400），其接收来自主轴电动机功率回路（220）的功率信号并控制主轴（21）的旋转。 主轴电动机控制电路（120）包括响应于模式选择信号传输脉宽调制信号或电流控制信号的多路复用器（127）和接收多路复用器输出信号的主轴预驱动器（125） 主轴电机控制信号到主轴电机电源电路（220）。

公开(公告)号：US07113361B2

公开(公告)日：2006-09-26

申请号：US10680933

申请日：2003-10-08

Applicant: Mehedi Hassan

Inventor： Mehedi Hassan

IPC: G11B21/02

CPC classification number: G11B21/12 ,  G11B5/54

Abstract: An apparatus, method and system for retracting a read/write head (13) to a landing position of a disk (11) in a disk drive system (10) which includes an actuator (33) coupled with the head (13) for retracting in a first direction toward an outside diameter of the disk (11) and a second direction toward an inside diameter of the disk (11) in response to corresponding signals. A control device (32) coupled with the actuator (33) which is adapted for determining a retract direction for the read/write head (13), wherein a first signal indicative of a first direction and a second signal indicative of a second direction is provided to the actuator (33), the control device (32) further providing the first signal following a loss of power which energizes the disk drive motor (38) of the disk drive system and providing the second signal subsequent to providing the first signal for retracting the read/write head (13) to the landing position.

Abstract translation: 一种用于将读/写头（13）缩回到盘驱动系统（10）中的盘（11）的着陆位置的装置，方法和系统，其包括与头部（13）联接的致动器（33），用于收回 沿着朝向盘（11）的外径的第一方向和朝向盘（11）的内径的第二方向响应于相应的信号。 与所述致动器（33）耦合的控制装置（32），其适于确定所述读/写头（13）的缩回方向，其中指示第一方向的第一信号和指示第二方向的第二信号是 提供给致动器（33）的情况下，控制装置（32）进一步提供第一信号，在功率损失之后，对磁盘驱动系统的磁盘驱动电机（38）进行激励，并且在提供第一信号之后提供第一信号， 将读/写头（13）缩回到着陆位置。