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公开(公告)号：US06549044B2
公开(公告)日：2003-04-15
申请号：US09972750
申请日：2001-10-05
IPC分类号： G11B2102
CPC分类号： H03F3/187 , H03F3/3061 , H03F3/3081
摘要： A control circuit providing a driving current to a voice coil motor to position a reading and writing head of a disk memory system is described. The circuit comprises a first and a second class AB amplifiers the outputs of which are connected to the terminals of a first resistor in series with the voice coil motor so that a current passes through the voice coil motor and through the first resistor. The circuit comprises a sense amplifier the input terminals of which are coupled with the terminals of said first resistor, a device at the input of which is present a signal which is a sum of an external signal and of an output signal of the sense amplifier. The first amplifier and the second amplifier being driven in inverted phase by an output signal produced by the device. The circuit comprises means for inserting a second resistor in series with the first resistor so that said current passes through the series of said first and said second resistors and so that said sense amplifier has the input terminals coupled with the terminals of said series of resistors.
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2.发明授权Driver circuit including slew rate control system with improved voltage ramp generator 失效驱动电路包括具有改进电压斜坡发生器的转换速率控制系统
公开(公告)号：US5825218A
公开(公告)日：1998-10-20
申请号：US736524
申请日：1996-10-24
CPC分类号： H03K17/063 , H03K17/667 , H03K4/94
摘要： A voltage ramp generator for a driver circuit is provided to give an output that is highly linear between zero and a maximum voltage has a combination of current sources or generators for charging and discharging a capacitor, with discharging performed by sequencing two different types of current sources. A first current source on the discharge side of the capacitor has transistors in cascode connected current mirrors and takes the capacitor voltage to a low value but not as low as zero. A second current source of a basic or simple current mirror then takes the capacitor voltage substantially to zero. The voltage ramp generator meets the requirements of high performance, integrated, driver circuits, particularly for achieving complete turn-off of a power device such as a DMOS transistor in a high side cascoded transistors goes up to a threshold near the full supply driver. It is optional to have two current sources for charging, also, where a first source with voltage and than a second source, in a basic current mirror, continues charging substantially to the supply voltage.
摘要翻译： 提供用于驱动器电路的电压斜坡发生器，以提供在零之间高度线性的输出，并且最大电压具有用于对电容器充电和放电的电流源或发生器的组合，通过对两种不同类型的电流源 。 在电容器的放电侧的第一电流源具有共源共栅电流镜中的晶体管，并将电容器电压降低到零，但不低于零。 基本或简单的电流镜的第二电流源然后将电容器电压基本上为零。 电压斜坡发生器满足高性能，集成的驱动器电路的要求，特别是为了实现功率器件的完全关断，例如在高侧的DMOS晶体管的共模感应晶体管在全电源驱动器附近达到阈值。 具有两个用于充电的电流源是可选的，而在基本电流镜中，具有电压和第二源的第一源也继续充电至电源电压。
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3.发明授权
公开(公告)号：US5742193A
公开(公告)日：1998-04-21
申请号：US740195
申请日：1996-10-24
CPC分类号： H03K4/00 , H03K17/04123 , H03K17/162 , H03K17/163 , H03K5/12
摘要： A preslewing circuit to rapidly drop a voltage on the gate of a power device in a power stage has a combination of a bipolar transistor and CMOS transistors. The gate voltage is brought down by the preslewing circuit to a level at which an output voltage can begin to change. The combination has high conduction and can be integrated readily, with good internal isolation, in a small chip area, thus having qualities desirable for high performance, integrated, driver circuits.
摘要翻译： 在功率级的功率器件的栅极上快速降低电压的预制电路具有双极晶体管和CMOS晶体管的组合。 栅极电压由预置电路降低到输出电压可以开始变化的水平。 该组合具有高导通性，并且可以在小的芯片面积中容易地集成，具有良好的内部隔离，因此具有高性能，集成的驱动器电路所需的质量。
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公开(公告)号：US6005359A
公开(公告)日：1999-12-21
申请号：US874868
申请日：1997-06-13
CPC分类号： G11B19/22
摘要： A power down brake latch circuit for dynamically braking a spindle motor in a disk drive system is disclosed. The power down brake latch circuit includes a reservoir capacitor, a smoothing capacitor, a timing circuit, and a logic circuit. The timing circuit includes a voltage divider and a bandgap comparator. The smoothing capacitor absorbs a BEMF voltage from the spindle motor as it rotates after losing power. The timing circuit generates a first signal when a voltage on the smoothing capacitor falls below a threshold. The logic circuit brakes the spindle motor in response to the loss of power and the generation of the first signal.
摘要翻译： 公开了一种用于动态地制动磁盘驱动系统中的主轴电动机的停电制动器闩锁电路。 断电制动器锁存电路包括储存电容器，平滑电容器，定时电路和逻辑电路。 定时电路包括分压器和带隙比较器。 平滑电容器在失去电源后旋转时吸收主轴电机的BEMF电压。 当平滑电容器上的电压下降到阈值以下时，定时电路产生第一信号。 逻辑电路响应于功率的损失和第一信号的产生而制动主轴电动机。
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公开(公告)号：US5589744A
公开(公告)日：1996-12-31
申请号：US502124
申请日：1995-07-13
CPC分类号： H02P6/10
摘要： A circuit for controlling the slew rate at a motor coil during turn-on in a commutation sequence is disclosed. The disclosed circuit includes a comparator for comparing the output of error amplifier to the input of the input buffer amplifier. The comparator connects the output of the error amplifier to the input of the buffer amplifier only after the input has been charged at a controlled rate. The integrating buffer amplifier includes an amplifier with a feedback capacitor, and a current source connected at its input, for reducing the voltage slew rate during turn-on of the transistor.
摘要翻译： 公开了一种用于在换向序列中的开启期间控制电动机线圈的转换速率的电路。 所公开的电路包括用于将误差放大器的输出与输入缓冲放大器的输入进行比较的比较器。 只有在输入以受控的速率充电之后，比较器将误差放大器的输出连接到缓冲放大器的输入。 积分缓冲放大器包括具有反馈电容器的放大器和在其输入端连接的电流源，用于降低晶体管导通期间的电压转换速率。
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">6.发明授权Counter circuit for controlling the operation of a quartz clock with "one touch" or "fast" electrical resetting of the time 失效用于通过“单触”或“快速”电气复位来控制石英时钟的操作的计数器电路
公开(公告)号：US5566138A
公开(公告)日：1996-10-15
申请号：US189978
申请日：1994-02-01
CPC分类号： G04C3/14
摘要： An electronic circuit for controlling an analog quartz clock, particularly for installation in automobiles, has first and second counters for generating control pulses at different rates according to whether the clock is to be operated in a normal mode, or a time-setting mode. In addition, a single 11-bit counter allows "fast" or "slow" resetting of the time by a single push button.
摘要翻译： 用于控制模拟石英时钟的电子电路，特别是用于安装在汽车中的电子电路具有第一和第二计数器，用于根据时钟是以正常模式操作还是时间设定模式，以不同的速率产生控制脉冲。 此外，单个11位计数器可通过单个按钮“快速”或“慢”重置时间。
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公开(公告)号：US6091222A
公开(公告)日：2000-07-18
申请号：US884879
申请日：1997-06-30
CPC分类号： H02P6/21
摘要： A method for starting a polyphase DC motor having a rotor. The position of the rotor is detected by initiating current in each of the phases of the motor and measuring a time period between the initiation of current in the coil and an instant when the current exceeds a threshold current. The phase in which the current reaches the threshold in the shortest amount of time is the phase closest to the position of the rotor. A phase closest to the position of the rotor is identified in each of an odd number of trials, and a starting phase is selected as the phase identified in the majority of trials. The motor is started by providing current to the starting phase.
摘要翻译： 一种用于启动具有转子的多相直流电动机的方法。 通过在电动机的每个相中启动电流并测量线圈中的电流启动与电流超过阈值电流的瞬间之间的时间段来检测转子的位置。 电流在最短时间内达到阈值的相位是最靠近转子位置的相位。 在奇数个试验中的每一个中确定最靠近转子位置的相位，并且选择起始阶段作为大多数试验中确定的相位。 通过向启动阶段提供电流来启动电机。
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公开(公告)号：USRE36046E
公开(公告)日：1999-01-19
申请号：US699879
申请日：1996-08-23
CPC分类号： F02D41/20 , H01F7/1844 , F02D2041/2017 , F02D2041/2034 , F02D2041/2058 , F02D2041/2075
摘要： .�.A circuit comprising a switch series connected to a load; a first and second current recirculating branch alternately connectable parallel to the load, for reducing the current in the same; and a logic control unit for opening and closing the switch and recirculating branches, so that the load is supplied with a current rising to a peak value and then falling rapidly to and oscillating about a lower hold value; a transistor being provided for reducing the voltage supplied to the load by the first recirculating branch at the end of the fast fall phase, so as to eliminate uncontrollable operating zones and prevent the load current from falling below the hold value..!..Iadd.A device for driving an inductive load such as a fuel injector includes a drive switch and a voltage regulator that are coupled to the inductive load. The device also includes a control circuit that is coupled to the voltage regulator, the drive switch, and the inductive load. The control circuit receives a drive signal and in response to the drive signal controls the voltage regulator and the drive switch. Initially, the switch closes and draws a charge current through the inductive load. When the charge current reaches a peak level, the switch opens to allow a discharge current to flow through the inductive load. The voltage regulator regulates the discharge voltage across the inductive load such that the discharge current falls at a first rate. When the discharge current reaches a first value, the voltage regulator regulates the discharge voltage across the inductive load so as to decrease the rate at which the discharge current falls. When the discharge reaches a second value, the control circuit controls the drive switch to generate a hold current through the inductive load. .Iaddend.
摘要翻译： [包括连接到负载的开关系列的电路; 可平行于负载交替连接的第一和第二电流循环分支，用于减少其中的电流; 以及逻辑控制单元，用于打开和闭合开关和再循环分支，使得向负载提供上升到峰值的电流，然后迅速下降并围绕较低的保持值摆动; 提供一种晶体管，用于在快速下降阶段结束时减少由第一再循环分支提供给负载的电压，以消除不可控制的工作区域，并防止负载电流降低到保持值以下。 诸如燃料喷射器的感性负载包括耦合到感性负载的驱动开关和电压调节器。 该装置还包括耦合到电压调节器，驱动开关和感性负载的控制电路。 控制电路接收驱动信号，响应驱动信号控制电压调节器和驱动开关。 最初，开关关闭并通过感性负载吸取充电电流。 当充电电流达到峰值电平时，开关打开以允许放电电流流过感性负载。 电压调节器调节感应负载上的放电电压，使得放电电流以第一速率下降。 当放电电流达到第一值时，电压调节器调节感应负载上的放电电压，以便降低放电电流下降的速率。 当放电达到第二值时，控制电路控制驱动开关以产生通过感性负载的保持电流。
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公开(公告)号：US5828245A
公开(公告)日：1998-10-27
申请号：US740129
申请日：1996-10-24
CPC分类号： H03K17/163 , H03K2217/0036
摘要： A driver circuit with an amplifier operated in a switching mode has threshold detectors with devices to compare the amplifier input and output voltage respectively to predetermined minimum and maximum levels representing fully off and fully on conditions for the driver circuit. The circuit provides signals to enable the amplifier to draw current from a supply only during transitions between the threshold levels and to otherwise disable the amplifier. The circuit is beneficial particularly when operating the amplifier from a voltage supply of very limited current capability, such as a charge pump voltage in an integrated circuit. The switching mode amplifier can be applied in high performance driver integrated circuits alone or in combination with innovative techniques for slew rate control and for preslewing the amplifier output that also provide high performance in compact circuit configurations.
摘要翻译： 具有以开关模式操作的放大器的驱动器电路具有阈值检测器，其具有将放大器输入和输出电压分别与驱动器电路的完全关断和完全接通条件的预定最小和最大电平进行比较的装置。 该电路提供信号以使放大器仅在阈值电平之间的转换期间从电源中提取电流，否则禁用放大器。 该电路是有益的，特别是当从具有非常有限的电流能力的电压源（例如集成电路中的电荷泵电压）来操作放大器时。 开关模式放大器可以单独应用于高性能驱动器集成电路，也可以与用于压摆率控制的创新技术结合使用，并且还可以在紧凑型电路配置中提供高性能的放大器输出。
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公开(公告)号：US5341032A
公开(公告)日：1994-08-23
申请号：US14051
申请日：1993-02-05
IPC分类号： F02D41/20 , H01F7/18 , H03K17/16 , H03K17/695 , H03K3/01 , F02M51/00 , H01H9/00 , H03K17/687
CPC分类号： F02D41/20 , H01F7/1844 , F02D2041/2017 , F02D2041/2034 , F02D2041/2058 , F02D2041/2075
摘要： A circuit comprising a switch series connected to a load; a first and second current recirculating branch alternately connectable parallel to the load, for reducing the current in the same; and a logic control unit for opening and closing the switch and recirculating branches, so that the load is supplied with a current rising to a peak value and then falling rapidly to and oscillating about a lower hold value; a transistor being provided for reducing the voltage supplied to the load by the first recirculating branch at the end of the fast fall phase, so as to eliminate uncontrollable operating zones and prevent the load current from falling below the hold value.
摘要翻译： 一种包括连接到负载的开关串联的电路; 可平行于负载交替连接的第一和第二电流循环分支，用于减少其中的电流; 以及逻辑控制单元，用于打开和闭合开关和再循环分支，使得向负载提供上升到峰值的电流，然后迅速下降并围绕较低的保持值摆动; 提供了一种晶体管，用于在快速下降阶段结束时降低由第一再循环分支提供给负载的电压，从而消除不可控制的工作区，并防止负载电流降至保持值以下。
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