Pulse monitor circuit for use as a fan speed monitor

Details Pulse monitor circuit for use as a fan speed monitor Pulse monitor circuit for use as a fan speed monitor

1983-12-22

1985-04-23

Shoop, William M.

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

361 23, 236 89, G05B 2302

Patent

active

045132330

ABSTRACT:
A circuit which monitors air flow by comparing the speed of a fan to a predetermined frequency. A Hall effect device detects magnetic pulses representative of the fan speed and provides a corresponding electrical signal. This signal is compared with a predetermined threshold frequency by a retriggerable monostable multivibrator. A digital delay circuit isolates pace conditions and a relay circuit provides an indication of the fan speed status.

REFERENCES:
patent: 3800188 (1974-03-01), Wilke
patent: 3971974 (1976-07-01), Ichiyanagi
patent: 4079432 (1978-03-01), Godfrey
patent: 4259625 (1981-03-01), Hatakeyama et al.
patent: 4346371 (1982-08-01), Ida
IBM Technical Disclosure Bulletin, "Digital Velocity Servomechanism", vol. 14, No. 3, Aug. 1971.

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