Proportional integral fan controller for computer

Details Proportional integral fan controller for computer Proportional integral fan controller for computer

1997-10-22

1999-07-27

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318473, 318268, 388934, 3889072, H02P 700

Patent

active

059295813

ABSTRACT:
A controller drives a fan's motor to proportionally control fan speed based on changes in heat output from electrical components in a local environment. The controller is connected to a temperature sensor and the fan motor. The temperature sensor senses local environment temperature, while exhibiting a lag time. The controller provides closed loop control and implements a system pole which cancels out the temperature sensor lag time during steady state operations. The controller implements an integration of a difference between sensed temperature and a reference temperature to generate the system pole.

REFERENCES:
patent: 3794896 (1974-02-01), Holt
patent: 4168456 (1979-09-01), Isobe
patent: 4276506 (1981-06-01), Little
patent: 4506199 (1985-03-01), Asche
patent: 5099181 (1992-03-01), Canon
patent: 5197858 (1993-03-01), Cheng
patent: 5457766 (1995-10-01), Ko

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