[특허]Crystal stabilized voltage to frequency converter with digital calibration for flowmeters

[미국특허] Crystal stabilized voltage to frequency converter with digital calibration for flowmeters 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01F-001/60
출원번호	US-0082765 (1979-10-09)
발명자 / 주소	Grebe Jr. John C. (Norristown PA) Freund Jr. William R. (Hatfield PA)
출원인 / 주소	Emerson Electric Co. (St. Louis MO 02)
인용정보	피인용 횟수 : 15 인용 특허 : 2

초록 ▼

A voltage controlled oscillator (VCO) system includes a feedback loop for maintaining the linearity, temperature stability and accuracy of the VCO. The feedback loop includes means for producing a fed-back train of pulses having an amplitude equal to a reference voltage and a duty cycle proportional to the ratio of the frequency of the output of the VCO to a reference frequency. The output frequency is thereby made proportional to the input voltage times the ratio of the reference frequency to the reference voltage.

대표청구항 ▼

In a flowmeter producing an output voltage dependent on flow rate, and including means for converting said output voltage to a digital signal, the improvement wherein said means for converting said output voltage to a digital signal comprises a high precision voltage to frequency converter system comprising frequency generating means for receiving said output voltage as an input signal and producing a variable frequency output signal dependent on the amplitude of the input signal, means for generating a reference frequency, trigger means responsive to said output signal and to said reference frequency for producing a feedback signal having a duty cycle proportional of the ratio of said input frequency and said reference frequency, and switching means for producing an output signal having an amplitude dependent on said reference voltage and a duty cycle equal to the duty cycle of said second signal, and filter means for deriving said output voltage from said output signal. In a flowmeter producing a frequency output dependent on flow rate, the improvement comprising a precision frequency to voltage converter system for receiving said frequency output as an input frequency and producing an output voltage proportional to said input frequency, said system comprising means for generating a reference frequency, means for generating a reference voltage, trigger means responsive to said input frequency and to said reference frequency for producing a second signal having a duty cycle dependent on the relationship between the frequencies of said output signal and said reference frequency, reference voltage means for controlling the amplitude of said feedback signal, and comparator means for receiving said feedbadk signal and said input signal and applying to said frequency generating means a signal dependent on the relationship between said input signal and the average value of said feedback signal.

이 특허에 인용된 특허 (2) 인용/피인용 타임라인 분석

Shauger Herbert (Willow Grove PA) Schmoock Roy (Richboro PA), Bi-directional electromagnetic flowmeter.
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Suzuki ; Kazuie, Bi-directional output electromagnetic flowmeter.
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이 특허를 인용한 특허 (15) 인용/피인용 타임라인 분석

Kobayashi Tamotsu (Tokyo JPX) Goto Shigeru (Tokyo JPX) Ohta Hironobu (Tokyo JPX) Torimaru Takashi (Tokyo JPX), Electromagnetic flow meter converter.
상세보기
Murray Jean P. (Minneapolis MN) Bohn David C. (Stillwater Township ; Washington County MN) Bengtson Darroll D. (New Brighton MN), Electromagnetic flowmeter.
상세보기
Yoshida Yutaka (Aichi-Ken JPX), Electromagnetic flowmeter.
상세보기
Schmoock Roy F. (Yardley PA) Shauger Herbert A. (Doylestown PA), Electromagnetic flowmeter system having a feedback loop.
상세보기
Box Gary W. (Golden Valley MN) Elberson Michael D. (Elm Grove WI), High resolution flowmeter with wear detection.
상세보기
Forkert Maurice J. (Fort Wayne IN) Sullivan Mark E. (Fort Wayne IN), Linearized turbine flow meter for fuel dispensers.
상세보기
Dam Es, Andrew Nicholas; England, James Mark Carson; Jones, Ross Peter; Topliss, Richard John; Ansell, Iain; Collier, Nicholas; Lodge, Graham; Hember, Miles William Noel, Magnetic flow meter.
상세보기
Coursolle, deceased,Thomas P., Magnetic flowmeter with built-in simulator.
상세보기
Gaertner Max H. (Warminster PA), Magnetic flowmeter with isolation amplifier and ranging circuit therefor and method.
상세보기
Hartwig Hagen (Erlangen DEX), Method and device for converting voltage to frequency.
상세보기
Hartwig Hagen (Erlangen DEX), Method and device for converting voltage to frequency.
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Walker ; Sr. Frank J. (8340 Northeast 2nd Ave. Miami FL 33138) Walker ; Jr. Frank J. (5711 South Utica Ave. Tulsa OK 74105), Method and system for controlling a mechanical pump to monitor and optimize both reservoir and equipment performance.
상세보기
Box Gary W. (Golden Valley MN) Elberson Michael D. (Elm Grove WI), Method of calibrating a high resolution flowmeter and measuring volume flow.
상세보기
Foss,Scot R.; Hunter,Kirk A., Reduced noise sensitivity in magnetic flowmeter.
상세보기
Cushing Vincent J. (153 Williams Dr. Annapolis MD 21401), Signal conditioner for electromagnetic flowmeter.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Crystal stabilized voltage to frequency converter with digital calibration for flowmeters 원문보기