公开(公告)号：US06727838B2

公开(公告)日：2004-04-27

申请号：US10254371

申请日：2002-09-25

申请人： Luca Schillaci ,  Alessandro Scrivani ,  Simone Silvestri ,  Maurizio Nessi

发明人： Luca Schillaci ,  Alessandro Scrivani ,  Simone Silvestri ,  Maurizio Nessi

IPC分类号： H03M134

CPC分类号： H03M1/48

摘要： The present invention herein describes a tracking analog-to-digital converter, in particular of the differential input type. In an embodiment thereof the tracking analog-to-digital converter, having a differential analog input including a first analog input and a second analog input, and a digital output at a first number of bits comprising: a back and forth counter having a direction input and an output, with a second number of bits; a digital-to-analog converter having a data input coupled to said output of said converter, a reference input and an output, with a second number of bits; a first comparator having a positive input, a negative input coupled to said output of said digital-to-analog converter and an output coupled to said direction input; characterized in that said reference input is coupled to said first analog input and said positive input of said first comparator is coupled to said second analog input.

摘要翻译： 本发明在此描述了特别是差分输入类型的跟踪模数转换器。在其实施例中，跟踪模数转换器具有包括第一模拟输入和第二模拟输入的差分模拟输入 以及以第一位数的数字输出，包括：带有第二位数的具有方向输入和输出的前后计数器; 具有耦合到所述转换器的所述输出的数据输入的数/模转换器，具有第二位数的参考输入和输出; 具有正输入的第一比较器，耦合到所述数模转换器的所述输出的负输入和耦合到所述方向输入的输出; 其特征在于，所述参考输入耦合到所述第一模拟输入，所述第一比较器的所述正输入端耦合到所述第二模拟输入。

公开(公告)号：US06249099B1

公开(公告)日：2001-06-19

申请号：US09345694

申请日：1999-06-30

申请人： Maurizio Nessi ,  Ezio Galbiati ,  Pierandrea Savo ,  Giorgio Sciacca ,  Luca Schillaci

发明人： Maurizio Nessi ,  Ezio Galbiati ,  Pierandrea Savo ,  Giorgio Sciacca ,  Luca Schillaci

IPC分类号： H02P750

CPC分类号： H02P6/10

摘要： A method drives a three-phase motor having first, second, and third coils. The method electrically connects the first coil to a first voltage reference and the second coil to a second voltage reference while leaving the other coil floating during a first driving phase. During a second driving phase, the first coil is electrically connected to the first voltage reference and the third coil is electrically connected to the second voltage reference while the second coil is left floating. During a transition phase that immediately follows the fast driving phase and immediately precedes the second driving phase, the second coil is electrically connected alternately to the first and second voltage references. By alternately connecting the second coil to the first second voltage references and during the transition phase, the method causes the current through the second coil to reduce to zero at a slower rate than prior methods. This enables the variations of the currents that the two phases in commutation, the second and third coils, to happen in a way that maintains their sum constant, as much as possible. This reduces the torque ripple during the phase commutations and its accompanying acoustic noise.

摘要翻译： 一种驱动具有第一，第二和第三线圈的三相电动机的方法。 该方法在第一驱动阶段期间将第一线圈电连接到第一参考电压并将第二线圈电连接到第二参考电压，同时使另一线圈浮置。 在第二驱动阶段期间，第一线圈电连接到第一参考电压，而第三线圈电连接到第二参考电压，而第二线圈悬空。 在紧接着快速驱动相位并且紧接在第二驱动相位之前的转变阶段期间，第二线圈交替地电连接到第一和第二参考电压。 通过交替地将第二线圈连接到第一第二电压基准，并且在转变阶段期间，该方法使得通过第二线圈的电流以比现有方法更慢的速率减小到零。 这使得能够以尽可能多的方式使换相，第二和第三线圈中的两相的电流的变化以保持它们的和恒定的方式发生。 这降低了相位转换期间的转矩脉动及其伴随的声学噪声。

公开(公告)号：US06788490B2

公开(公告)日：2004-09-07

申请号：US10097638

申请日：2002-03-14

申请人： Luca Schillaci ,  Maurizio Nessi ,  Ezio Galbiati

发明人： Luca Schillaci ,  Maurizio Nessi ,  Ezio Galbiati

IPC分类号： G11A5596

CPC分类号： G11B5/5547 ,  G11B21/083

摘要： A circuit estimates speed of an electromagnetic actuator associated with a reading head of a disk storage unit and a digital controller. The circuit includes first and second supply terminals and an output terminal, with the first supply terminal being connected to the electromagnetic actuator. A measuring resistor is connected to the second supply terminal, and is connected in series with the electromagnetic actuator for measuring a current which passes therethrough when a supply voltage is applied between the first and second supply terminals. An adder has an output connected to the output terminal for providing an output voltage, a first input is connected to the first supply terminal, and a second input is connected to the second supply terminal. An adjustable-gain amplifier is connected between the measuring resistor and the second input of the adder for transferring the supply voltage and a voltage across the measuring resistor to the adder. A determination circuit is connected to the adjustable-gain amplifier for determining a gain thereof. The determination circuit includes a coarse setting circuit and a fine calibration circuit controlled by the digital controller.

摘要翻译： 电路估计与磁盘存储单元和数字控制器的读取头相关联的电磁致动器的速度。 该电路包括第一和第二电源端子和输出端子，其中第一电源端子连接到电磁致动器。 测量电阻器连接到第二电源端子，并且当在第一和第二电源端子之间施加电源电压时，与电磁致动器串联连接以测量通过电流的电流致动器。 加法器具有连接到输出端子的输出端，用于提供输出电压，第一输入端连接到第一电源端子，第二输入端连接到第二电源端子。 一个可调增益放大器连接在测量电阻和加法器的第二个输入端之间，用于将电源电压和测量电阻两端的电压传递给加法器。 确定电路连接到可调增益放大器以确定其增益。 确定电路包括由数字控制器控制的粗略设置电路和精细校准电路。

公开(公告)号：US06680598B2

公开(公告)日：2004-01-20

申请号：US09988911

申请日：2001-11-19

申请人： Ezio Galbiati ,  Maurizio Nessi ,  Luca Schillaci

发明人： Ezio Galbiati ,  Maurizio Nessi ,  Luca Schillaci

IPC分类号： H02P500

CPC分类号： H02P25/034

摘要： A circuit for the speed recovery of a direct current motor includes an output stage, output stage having a first pair of transistors, a second pair of transistors, and means a first circuit configured to detect a current circulating in the motor. The output stage further includes a second circuit configured to, activate the second pair transistors for a determined first time period so as to short-circuit the motor, and, at the end of the first time period, unbalance the output stage so as to force a maximum current to circulate for a determined second time period as a function of a value detected by the first circuit during the first time period, so as to stop the motor.

摘要翻译： 用于直流电动机的速度恢复的电路包括输出级，具有第一对晶体管的输出级，第二对晶体管，以及被配置为检测在电动机中循环的电流的第一电路。 输出级还包括第二电路，其被配置为在确定的第一时间段内激活第二对晶体管以使电动机短路，并且在第一时间段结束时，输出级不平衡以迫使 在第一时间段期间作为由第一电路检测的值的函数循环确定的第二时间段的最大电流，以便停止电动机。

公开(公告)号：US06417639B1

公开(公告)日：2002-07-09

申请号：US09564307

申请日：2000-05-03

申请人： Luca Schillaci ,  Maurizio Nessi ,  Giorgio Sciacca

发明人： Luca Schillaci ,  Maurizio Nessi ,  Giorgio Sciacca

IPC分类号： G05B1101

CPC分类号： G11B5/59605 ,  G11B5/5526

摘要： A positioning system for a read/write head of a disk drive includes a rotatable data disk, a read/write head movable over the disk, a voice coil motor (VCM) connected to the head and a source of digital position signals. A control circuit includes means for generating a VCM control current, a sensor for sensing the VCM current and an amplifier having an inverting input connected to a reference voltage source through a resistor and to a sensor output, a non-inverting input connected to the source of digital position signals through a DAC and an output connected to an input of the drive means.

摘要翻译： 用于磁盘驱动器的读/写头的定位系统包括可旋转数据盘，可移动到盘上的读/写头，连接到头的音圈电机（VCM）和数字位置信号源。 控制电路包括用于产生VCM控制电流的装置，用于感测VCM电流的传感器和具有通过电阻器连接到参考电压源的反相输入和传感器输出的放大器，连接到源的非反相输入 的数字位置信号通过DAC和连接到驱动装置的输入的输出。

公开(公告)号：US6094022A

公开(公告)日：2000-07-25

申请号：US346650

申请日：1999-07-01

申请人： Luca Schillaci ,  Maurizio Nessi ,  Giacomino Bollati ,  Ezio Galbiati

发明人： Luca Schillaci ,  Maurizio Nessi ,  Giacomino Bollati ,  Ezio Galbiati

IPC分类号： H02P6/18 ,  H02K23/00

CPC分类号： H02P6/182

摘要： A BEMF detector and method detect the BEMF of a three-phase motor using a fully differential detection system. The motor has a first coil coupled between a first coil tap and a center tap, a second coil coupled between a second coil tap and the center tap, and a third coil coupled between a third coil tap and the center tap. The BEMF detector includes a differential amplifier having first and second inputs and first and second outputs, with the first input being coupled to one of the coil taps and the second input being coupled to the center tap. The BEMF detector also includes a comparator having first and second inputs coupled respectively to the first and second outputs of the differential amplifier and an output at which a BEMF signal is produced that is related to the BEMF of the motor. The differential amplifier may be part of an anti-alias filter structured to fix to a known stable value a common mode at the outputs of the differential amplifier. The BEMF detector also may include one or more fully differential filters positioned between the differential amplifier and the comparator to reduce noise and smooth the BEMF signal output by the comparator. One of the filters can be a linear phase, switched capacitor filter with a stable cutoff frequency.

摘要翻译： BEMF检测器和方法使用完全差分检测系统检测三相电机的BEMF。 电动机具有耦合在第一线圈抽头和中心抽头之间的第一线圈，耦合在第二线圈抽头和中心抽头之间的第二线圈以及耦合在第三线圈抽头和中心抽头之间的第三线圈。 BEMF检测器包括具有第一和第二输入以及第一和第二输出的差分放大器，其中第一输入耦合到线圈抽头之一并且第二输入耦合到中心抽头。 BEMF检测器还包括比较器，其具有分别耦合到差分放大器的第一和第二输出端的第一和第二输入端以及产生与马达的BEMF有关的BEMF信号的输出端。 差分放大器可以是抗差分滤波器的一部分，其被构造为在差分放大器的输出处固定到已知稳定值的共模。 BEMF检测器还可以包括位于差分放大器和比较器之间的一个或多个全差分滤波器，以降低噪声并平滑比较器输出的BEMF信号。 其中一个滤波器可以是具有稳定截止频率的线性相位开关电容滤波器。

公开(公告)号：US08174292B2

公开(公告)日：2012-05-08

申请号：US12541468

申请日：2009-08-14

申请人： Maurizio Nessi ,  Luca Schillaci

发明人： Maurizio Nessi ,  Luca Schillaci

IPC分类号： H02M11/00 ,  H03F3/45

CPC分类号： H03F3/45192 ,  G01R19/0092

摘要： A current sensing circuit for a pulse width modulation (PWM) application may include first and second input terminals to be coupled to ends of a sensing resistance, an output terminal, and first and second internal circuit nodes. The current sensing circuit further may include an input block comprising a first transconductance amplifier to be coupled to a supply voltage. The first transconductance amplifier may be coupled to the first and second input terminals and to the first and second internal circuit nodes. The current sensing circuit may also include an amplifier block comprising an amplifier to be coupled to a reference voltage, and coupled to the first and second internal circuit nodes and the output terminal, and a feedback block comprising a second transconductance amplifier to be coupled to the supply voltage and being coupled to the output terminal and the first and second internal circuit nodes. The input block may further include a third transconductance amplifier coupled in cascade to the first transconductance amplifier and to the first and second input terminals.

摘要翻译： 用于脉冲宽度调制（PWM）应用的电流感测电路可以包括要耦合到感测电阻的端部的第一和第二输入端子，输出端子以及第一和第二内部电路节点。 电流感测电路还可以包括输入块，其包括要耦合到电源电压的第一跨导放大器。 第一跨导放大器可以耦合到第一和第二输入端子以及第一和第二内部电路节点。 电流感测电路还可以包括放大器块，其包括要耦合到参考电压的放大器，并且耦合到第一和第二内部电路节点和输出端子，反馈块包括第二跨导放大器， 电源电压并耦合到输出端子以及第一和第二内部电路节点。 输入块还可以包括级联耦合到第一跨导放大器以及第一和第二输入端的第三跨导放大器。

公开(公告)号：US20100066413A1

公开(公告)日：2010-03-18

申请号：US12541468

申请日：2009-08-14

申请人： Maurizio NESSI ,  Luca Schillaci

发明人： Maurizio NESSI ,  Luca Schillaci

IPC分类号： G01R19/00

CPC分类号： H03F3/45192 ,  G01R19/0092

摘要： A current sensing circuit for a pulse width modulation (PWM) application may include first and second input terminals to be coupled to ends of a sensing resistance, an output terminal, and first and second internal circuit nodes. The current sensing circuit further may include an input block comprising a first transconductance amplifier to be coupled to a supply voltage. The first transconductance amplifier may be coupled to the first and second input terminals and to the first and second internal circuit nodes. The current sensing circuit may also include an amplifier block comprising an amplifier to be coupled to a reference voltage, and coupled to the first and second internal circuit nodes and the output terminal, and a feedback block comprising a second transconductance amplifier to be coupled to the supply voltage and being coupled to the output terminal and the first and second internal circuit nodes. The input block may further include a third transconductance amplifier coupled in cascade to the first transconductance amplifier and to the first and second input terminals.

摘要翻译： 用于脉冲宽度调制（PWM）应用的电流感测电路可以包括要耦合到感测电阻的端部的第一和第二输入端子，输出端子以及第一和第二内部电路节点。 电流感测电路还可以包括输入块，其包括要耦合到电源电压的第一跨导放大器。 第一跨导放大器可以耦合到第一和第二输入端子以及第一和第二内部电路节点。 电流感测电路还可以包括放大器块，其包括要耦合到参考电压的放大器，并且耦合到第一和第二内部电路节点和输出端子，反馈块包括第二跨导放大器， 电源电压并耦合到输出端子以及第一和第二内部电路节点。 输入块还可以包括级联耦合到第一跨导放大器以及第一和第二输入端的第三跨导放大器。

公开(公告)号：US07463443B2

公开(公告)日：2008-12-09

申请号：US11225394

申请日：2005-09-13

申请人： Luca Schillaci

发明人： Luca Schillaci

IPC分类号： G11B21/02

CPC分类号： H02P25/034

摘要： A reduced hardware control circuit device includes a current loop for broad band Hard Disk Drive applications. The current loop detects the value of the current flowing on the coils of a voice coil electric motor incorporated in the Hard Disk Drive. A sensing resistance is connected in series with the motor and at least a driving driver for a relative motor coil. Advantageously the current loop is a transconductance loop with a first transconductance amplifier associated with the sensing resistance. A second transconductance amplifier is provided for fixing the current value to be applied to the motor. The circuit device advantageously is deprived of a local compensation in correspondence with the first transconductance amplifier.

摘要翻译： 降低的硬件控制电路装置包括用于宽带硬盘驱动器应用的电流回路。 电流回路检测流入硬盘驱动器中的音圈电动机的线圈上的电流值。 感测电阻与电动机和至少一个用于相对电动机线圈的驱动驱动器串联连接。 有利地，电流环是具有与感测电阻相关联的第一跨导放大器的跨导环路。 提供第二跨导放大器用于固定要施加到电动机的电流值。 电路装置有利地与第一跨导放大器相对应地被剥夺了局部补偿。

公开(公告)号：US06392375B1

公开(公告)日：2002-05-21

申请号：US09542101

申请日：2000-04-04

申请人： Salvatore Portaluri ,  Alessandro Savo ,  Luigi Eugenio Garbelli ,  Giuseppe Luciano ,  Luca Schillaci

发明人： Salvatore Portaluri ,  Alessandro Savo ,  Luigi Eugenio Garbelli ,  Giuseppe Luciano ,  Luca Schillaci

IPC分类号： H02P100

CPC分类号： G11B5/4846 ,  G11B5/4813 ,  G11B5/5526 ,  G11B21/083 ,  H02P25/034

摘要： The method is for controlling a voice coil motor which drives a mechanical arm via a control circuit which sets the output nodes, to which the motor is connected, in a high impedance state for a certain time interval. The method and circuit detect the back electromotive force induced on the motor winding during the time interval, and deliver current pulses for driving the motor. The circuit compares the detected back electromotive force with a certain target value and regulates the amplitude of the driving current pulses as a function of the difference between the detected value of the back electromotive force and a voltage signal representing the desired speed of the arm, according to a pre-established function. A preferred embodiment includes such a function being a pre-established saturated linear characteristic with an offset value.

摘要翻译： 该方法用于控制音圈电动机，其经由控制电路驱动机械臂，该控制电路将电动机连接的输出节点设置在高阻抗状态下一段时间间隔。 该方法和电路在时间间隔内检测在电动机绕组上感应的反电动势，并传送用于驱动电动机的电流脉冲。 该电路将检测到的反电动势与某一目标值进行比较，并且将驱动电流脉冲的幅度作为反电动势的检测值与表示臂的期望速度的电压信号之间的差的函数进行比较，根据 到一个预先建立的功能。 优选实施例包括具有偏移值的预先建立的饱和线性特性的功能。