中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

6 records (took 0.013 seconds)

    Pulse rate to analog converter
    1.
    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
    3.
    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.

Patent Agency Ranking