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公开(公告)号：US6064539A
公开(公告)日：2000-05-16
申请号：US989094
申请日：1997-12-11
CPC分类号： G11B5/54
摘要： A method of parking the head by first moving the head toward the inner diameter of the disc an then back across the disc and parking the head on a flat part of a ramp. In one embodiment, a moderate voltage on the motor drives the head toward the inner diameter of the disc until the head hits the inner crash stop and then a moderate current drives the head back across the disc to give the head enough momentum to get to the flat part of he ramp. In another embodiment, more stages, each having a different voltage, are used to get better control of the velocity of the head as it is being driven across the disc. A higher voltage is also used to turn the head to move toward the inner diameter of the disc when it is moving fast toward the outer diameter. A retract circuit controls the movement of the head during retract. To be able to drive the head in the tow directions, the retract circuit needs to be bipolar, containing both a current source and a current sink. Counters are used to time the driving of the head. Driving the head toward the outer diameter of the disc across substantially the entire disc permits the head to gather momentum as the head approaches the ramp, and use a lower current to ensure that the head gets to the flat art of the ramp where it is then parked. Parking the head on the flat part of the ramp prevents the head from landing on the disc, preventing damage to the head and the disc, and eliminating the possibility of loss or corruption of data due to the head landing on the disc.
摘要翻译： 通过首先将头朝向盘的内径移动然后穿过盘并将头停放在斜坡的平坦部分上来停止头部的方法。 在一个实施例中，电动机上的中等电压将磁头驱动朝向盘的内径，直到磁头撞击内部碰撞停止，然后中等电流将磁头驱回磁盘，以使磁头足够动量以达到 平坦的部分他斜坡。 在另一个实施例中，使用具有不同电压的更多级，以便当磁头被驱动穿过磁盘时，更好地控制磁头的速度。 当高速向外径移动时，较高的电压也用于转动头朝向盘的内径移动。 缩回电路在收回期间控制头部的移动。 为了能够沿牵引方向驱动头部，缩回电路需要是双极的，包含电流源和电流槽。 计数器用于驱动头部。 当头部接近斜坡时，将磁头朝向盘的外径驱动，允许磁头在磁头接近斜坡时收集动量，并使用较低的电流来确保磁头进入斜坡的平面技术 停车 将头部停放在坡道的平坦部分上，防止头部落在椎间盘上，防止头部和椎间盘损伤，并消除由于头部着陆在椎间盘而导致的数据丢失或损坏的可能性。
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公开(公告)号：US4320255A
公开(公告)日：1982-03-16
申请号：US158531
申请日：1980-06-11
IPC分类号： H03G1/02 , H03G3/00 , H03G3/04 , H03J1/00 , H03J5/02 , H04B1/16 , H04B1/20 , H04R5/04 , H04B1/26 , H04S7/00
CPC分类号： H03J5/0281 , H03G1/02 , H03G3/00 , H03G3/04 , H03J1/0016 , H04B1/16 , H04B1/20
摘要： An electronic pushbutton tunable radio (10) having various audio controls is disclosed. A single pushbutton (22) is utilized to implement volume, fader and balance modes of operation during which up/down pushbuttons (20,21) control the overall and relative magnitude of audio signals produced by four speakers (24-27) while at the same time a single display (17) is utilized to display, respectively, either the channel to which the radio is tuned, the relative magnitude between right and left speaker audio signals, or the relative magnitude between front and back speaker audio signals. The radio has tuning pushbuttons (14) for direct recall of preset radio channels in a tuning mode operation. The radio includes an audio mode pushbutton (23) which terminates the tuning mode and implements an audio control mode wherein the recall tuning pushbuttons (14) now serve as on/off manual controls for audio control circuits, such as the radio local/distant (L/D) circuit, while at the same time utilizing the display (17) previously utilized to indicate channel frequency to now indicate the operative state of the audio circuits controlled by the recall pushbuttons in the audio mode.
摘要翻译： 公开了具有各种音频控制的电子按钮可调谐无线电（10）。 使用单个按钮（22）来实现音量，推子和平衡操作模式，其中上/下按钮（20,21）控制由四个扬声器（24-27）产生的音频信号的总体和相对幅度，而在 同时使用单个显示器（17）来分别显示无线电被调谐的频道，左和右扬声器音频信号之间的相对幅度，或前后扬声器音频信号之间的相对幅度。 收音机具有调谐按钮（14），用于在调谐模式操作中直接调用预设的无线电频道。 收音机包括音频模式按钮（23），其终止调谐模式并实现音频控制模式，其中调用调谐按钮（14）现在用作音频控制电路的开/关手动控制，诸如无线电本地/远端（ L / D）电路，同时利用先前用于指示频道频率的显示器（17）来指示由音频模式中的召回按钮控制的音频电路的操作状态。
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公开(公告)号：US4514651A
公开(公告)日：1985-04-30
申请号：US450415
申请日：1982-12-16
申请人： Ira Miller , Michael W. Null
发明人： Ira Miller , Michael W. Null
IPC分类号： H03K19/013 , H03K19/018 , H03K19/092 , H03K19/086 , H03K19/088
CPC分类号： H03K19/013 , H03K19/01806
摘要： In a circuit for converting signals having ECL logic levels to a signal having TTL logic levels, the level shift is accomplished using the base-emitter drops of the transistors employed to avoid the speed degradation that accompanies the use of resistors as level shifters. First and second complementary input ECL signals are applied to first and second transistors respectively. The first input signal results in rendering a drive transistor conductive which turns the source transistor means in a push-pull output stage off and the sink transistor in the output stage on. When the second input signal goes high, current is diverted so as to render the drive transistor nonconductive. Additional circuit means are provided for preventing the sink transistor from saturating and for preventing the input of the source transistor means from falling below a predetermined level. Circuit means are also provided for turning the source transistor means off quickly so as to improve the overall speed performance of the circuit.
摘要翻译： 在用于将具有ECL逻辑电平的信号转换为具有TTL逻辑电平的信号的电路中，使用用于避免伴随使用电阻器作为电平移位器的速度劣化的晶体管的基极 - 发射极点来实现电平移位。 第一和第二互补输入ECL信号分别施加到第一和第二晶体管。 第一输入信号导致驱动晶体管导通，使源极晶体管装置在推挽输出级中断开，并且输出级中的漏极晶体管导通。 当第二输入信号变为高电平时，电流被转向以使驱动晶体管不导通。 提供了附加的电路装置，用于防止漏极晶体管饱和并且防止源极晶体管装置的输入降低到预定水平以下。 还提供用于快速转动源晶体管装置的电路装置，以便提高电路的整体速度性能。
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公开(公告)号：US4501979A
公开(公告)日：1985-02-26
申请号：US413054
申请日：1982-08-30
CPC分类号： H03K17/6285 , G05F3/265
摘要： A current amplifier is provided having a single control amplifier and a plurality of output stages. The desired output stage is digitally selected. The ratios of the output stage currents may be selected during the metalization process. A single capacitor compensates for all output stages regardless of which output stage is selected.
摘要翻译： 提供了具有单个控制放大器和多个输出级的电流放大器。 所需的输出级数字选择。 可以在金属化处理期间选择输出级电流的比率。 单个电容器补偿所有输出级，无论选择哪个输出级。
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公开(公告)号：US4501974A
公开(公告)日：1985-02-26
申请号：US449035
申请日：1982-12-13
申请人： Ira Miller , Michael W. Null , Robert N. Dotson
发明人： Ira Miller , Michael W. Null , Robert N. Dotson
摘要： A pulse stretching integrated circuit includes an on-chip capacitor. A first transistor means including an input transistor and an emitter follower transistor supplies a charging current to the capacitor so as to charge it to a first voltage when an input signal pulse is in a first logical state. A differential transistor pair has a first input coupled to the emitter follower transistor and to the capacitor and has a second input coupled to a reference voltage for generating a first output when the capacitor voltage is less than the reference voltage and for generating a second output when the capacitive voltage is greater than the reference voltage. An additional transistor is coupled to the capacitor for discharging the capacitor when the input signal pulse is in a second logical state causing the voltage at the first input of the differential pair to fall below the reference voltage.
摘要翻译： 脉冲拉伸集成电路包括片上电容器。 包括输入晶体管和射极跟随器晶体管的第一晶体管装置向电容器提供充电电流，以便当输入信号脉冲处于第一逻辑状态时将其充电到第一电压。 差分晶体管对具有耦合到射极跟随器晶体管和电容器的第一输入，并且具有耦合到参考电压的第二输入，用于当电容器电压小于参考电压时产生第一输出，并且当第 电容电压大于参考电压。 当输入信号脉冲处于第二逻辑状态时，附加晶体管耦合到电容器，用于对电容器进行放电，导致差分对的第一输入处的电压低于参考电压。
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6.发明授权Apparatus and method for detecting rotor position in a sensorless and brushless DC motor 失效在无传感器和无刷直流电机中检测转子位置的装置和方法
公开(公告)号：US5327053A
公开(公告)日：1994-07-05
申请号：US929614
申请日：1992-08-12
摘要： An apparatus and process for detecting rotor position for improved motor start-up. The apparatus detects a target equilibrium position of the rotor using a fixed gain amplifier, window comparator and slope detector circuitry. The window comparator circuitry qualifies the peaks of the back EMF signal. Slope detector circuitry pinpoints the peak of the back EMF signal qualified by the window comparator. The technique utilizes the steps of energizing the phase windings of said motor, detecting the target equilibrium position, and then accelerating the motor through a commutation process.
摘要翻译： 用于检测转子位置以改进电机启动的装置和过程。 该装置使用固定增益放大器，窗口比较器和斜率检测器电路来检测转子的目标平衡位置。 窗口比较器电路限定反电动势信号的峰值。 斜率检测器电路确定由窗口比较器限定的反向EMF信号的峰值。 该技术利用对所述电动机的相绕线通电，检测目标平衡位置，然后通过换向过程加速电动机的步骤。
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公开(公告)号：US4485352A
公开(公告)日：1984-11-27
申请号：US413052
申请日：1982-08-30
CPC分类号： H03F3/343
摘要： A current amplifier uses a current mirror arrangement as an operational amplifier whose output has limited swing. The limited swing is achieved through a plurality of series connected diodes connected to a control input of the amplifier and to the output of the operational amplifier. The control input is coupled through a transistor to inhibit the output of the current mirror arrangement. The output node is coupled to an output for the current amplifier through a Darlington arrangement which provides high current gain.
摘要翻译： 电流放大器使用电流镜布置作为输出具有有限摆幅的运算放大器。 通过连接到放大器的控制输入和运算放大器的输出的多个串联连接的二极管实现有限的摆幅。 控制输入通过晶体管耦合以阻止电流镜布置的输出。 输出节点通过提供高电流增益的达林顿配置耦合到电流放大器的输出端。
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