High precision fan control/alarm circuit

Details High precision fan control/alarm circuit High precision fan control/alarm circuit

1996-05-17

1998-11-03

Masih, Karen

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318798815, 318641, 318783, 318234, 318439, 318138, 388934, G05B 500

Patent

active

058314059

ABSTRACT:
A motor speed control circuit includes a temperature sensor providing a first voltage output which is proportional to the temperature and a control voltage generator having an internal voltage reference receiving the first output as an input. The control voltage generator develops a control voltage representative of a desired motor speed profile which varies substantially linearly between a first predetermined temperature and a second predetermined temperature and supplies the control voltage to a motor drive circuit with a motor drive voltage at its output. The control voltage is fed back to the temperature sensor to achieve a controlled, fast rising slope. A second feedback circuit results in a reduced slope of the voltage between the second predetermined temperature and a third predetermined temperature at which an alarm signal is generated. The circuit also is able to detect a stopped motor and provide an alarm.

REFERENCES:
patent: 4194129 (1980-03-01), Dumbeck
patent: 4284943 (1981-08-01), Rowe
patent: 4510548 (1985-04-01), Boothman
patent: 4691668 (1987-09-01), West
patent: 5102040 (1992-04-01), Harvey
patent: 5123081 (1992-06-01), Bachman et al.
patent: 5364026 (1994-11-01), Kundert
patent: 5563480 (1996-10-01), Okada
patent: 5566062 (1996-10-01), Quisenberry et al.
patent: 5632156 (1997-05-01), Takeo et al.

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