Method and circuit for controlling motor speed

Details Method and circuit for controlling motor speed Method and circuit for controlling motor speed

2008-05-20

2008-05-20

Duda, Rina (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S254100, C318S132000, C318S434000, C318S471000, C388S811000

Reexamination Certificate

active

07375486

ABSTRACT:
A method of controlling a rotational speed of a fan motor for a heat generating electronic component includes the following steps: (1) obtaining an original PWM pulse in response to an internal die temperature of the electronic component, the original PWM pulse having a first duty cycle which corresponds to a first rotational speed for the fan motor; (2) obtaining an ambient temperature surrounding the electronic component; (3) generating a new PWM pulse based on the original PWM pulse and the ambient temperature, the new PWM pulse having a second duty cycle which corresponds to a second rotational speed for the fan motor; and (4) controlling the fan motor to operate at the second rotational speed. In this method, both the internal die temperature of the electronic component and the ambient temperature surrounding the electronic component are taken into consideration in determining the rotational speed of the fan motor.

REFERENCES:
patent: 6040668 (2000-03-01), Huynh et al.
patent: 6135718 (2000-10-01), Yang
patent: 6592449 (2003-07-01), Cipolla et al.
patent: 6874327 (2005-04-01), Wahler et al.

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