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    Overspeed protection system for centrifuge apparatus
    1.
    发明授权
    Overspeed protection system for centrifuge apparatus 失效
    离心机超速保护系统

    公开(公告)号：US3921047A

    公开(公告)日：1975-11-18

    申请号：US34735573

    申请日：1973-04-02

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： CARTER ALAN W ,  FRANKLIN ROBERT C

    IPC: B04B9/10 ,  B04B13/00 ,  F16P7/00 ,  G05D13/62 ,  H02P3/06

    CPC classification number: F16P7/00 ,  B04B13/003 ,  Y10S388/903 ,  Y10S388/921 ,  Y10S388/933

    Abstract: In an overspeed protection system for a centrifuge apparatus of the type which uses a coded reflective disk having alternate reflective and non-reflective sectors secured to a rotor to determine the maximum safe operating speed thereof, there is disclosed apparatus for detecting, upon start-up of the centrifuge, whether the disk is in place and operating properly. This is ascertained by determining whether the time durations of the signals from the rotor are greater or less than a predetermined minimum value. If they are greater than the minimum value, this is indicative of the fact that the coded disk is in proper position. If they are less than the minimum value, a power shutdown command is generated.

    Abstract translation: 在使用具有固定到转子的交替反射和非反射扇区的编码反射盘来确定其最大安全操作速度的类型的离心机设备的超速保护系统中，公开了一种用于在启动时检测 的离心机，无论磁盘是否到位​​并正常运行。 这通过确定来自转子的信号的持续时间是否大于或小于预定的最小值来确定。 如果它们大于最小值，则这表示编码的磁盘处于适当的位置。 如果它们小于最小值，则生成电源关闭命令。

    Pulse rate to analog converter
    2.
    发明授权
    Pulse rate to analog converter 失效
    脉冲转换为模拟转换器

    公开(公告)号：US3591858A

    公开(公告)日：1971-07-06

    申请号：US3591858D

    申请日：1968-05-31

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： BOYD WILLIAM R ,  FRANKLIN ROBERT C

    IPC: G01P3/48 ,  G01R23/00 ,  G01R23/06 ,  H03K17/00 ,  H03B3/04

    CPC classification number: G01R23/06 ,  G01P3/4802 ,  G01R23/00

    Abstract: A system for providing an analog output signal whose average amplitude is proportional to the frequency of an input signal including a constant pulse width generator responsive to the input signal for providing a series of pulses each of which has a predetermined duration at the same frequency as the input signal and an averaging circuit responsive to the series of pulses for providing an analog signal whose average amplitude is a function of the duty cycle of the constant pulse width generator.

    Overspeed detection system
    4.
    发明授权
    Overspeed detection system 失效
    超检测系统

    公开(公告)号：US3636545A

    公开(公告)日：1972-01-18

    申请号：US3636545D

    申请日：1969-04-01

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： BOYD WILLIAM R ,  FRANKLIN ROBERT C

    IPC: G05D13/62 ,  B04B9/10 ,  G01P1/10 ,  G01P3/489 ,  G08B21/00

    CPC classification number: G01P1/106

    Abstract: A system for sensing an overspeed condition which may exist in a rotating device such as a centrifuge. The system receives, as its inputs, a train of pulses, each pulse indicative of a predetermined number of revolutions of the rotating device. The system functions as an events per-unit-time counter, counting the input pulse rate for a given interval of time with the total pulse count representing the desired speed if the rotating device is onspeed. If the device exceeds the desired speed by a predetermined percentage, the system is activated to indicate an overspeed condition and automatically remove power from the rotating device drive circuits. To prevent premature shutdown of the rotating device by spurious triggering signals, a time delay circuit requires that the overspeed condition exist for a predetermined time interval before system shutdown is accomplished.

    Differential amplifier circuit
    6.
    发明授权
    Differential amplifier circuit 失效
    差分放大器电路

    公开(公告)号：US3667063A

    公开(公告)日：1972-05-30

    申请号：US3667063D

    申请日：1970-04-27

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： BOYD WILLIAM RICHARD ,  FRANKLIN ROBERT C

    IPC: H03F3/393 ,  H03F19/00

    CPC classification number: H03F3/393

    Abstract: An electronic circuit for balancing a differential amplifier by periodically equalizing the inputs of the amplifier and monitoring the output of the amplifier with equalized inputs. The output of the amplifier is then used to balance the amplifier by changing the current in one leg of the differential amplifier circuit until the output level correctly indicates the equalized inputs.

    Abstract translation: 一种电子电路，用于通过周期性地均衡放大器的输入并用均衡的输入来监视放大器的输出来平衡差分放大器。 然后，放大器的输出用于通过改变差分放大器电路的一条支路中的电流来平衡放大器，直到输出电平正确地指示均衡的输入。

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