Method and control circuit for reducing instantaneous...

Details Method and control circuit for reducing instantaneous... Method and control circuit for reducing instantaneous...

2011-03-15

2011-03-15

Connolly, Mark (Department: 2116)

Electrical computers and digital processing systems: support

Digital data processing system initialization or configuration

C713S002000

Reexamination Certificate

active

07908468

ABSTRACT:
A method and a control circuit for reducing an instantaneous startup current of a computer system by decreasing a fan rotational speed are provided. The computer system comprises a management controller coupled to a fan device through a tri-state buffer. In the present method, a duty cycle of a first PWM signal is reduced by the management controller. After that, the tri-state buffer is enabled to pass the first PWM signal with the reduced duty cycle to the fan device. Finally, the fan device is powered with the first PWM signal when the computer system is powered on. By reducing the duty cycle of the PWM signal before powering the computer system and turning on the fan device, the fan rotational speed of the fan device can be decreased when the computer system is powered on. As a result, the instantaneous startup current of the computer system can be reduced.

REFERENCES:
patent: 2003/0120394 (2003-06-01), Ziarnik
patent: 2003/0193307 (2003-10-01), Burstein
patent: 2005/0168929 (2005-08-01), Inoue et al.
patent: 2006/0178786 (2006-08-01), Bhagwath et al.
patent: 2007/0292257 (2007-12-01), Ooi et al.

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