Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-01-27
1998-12-08
Ray, Gopal C.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
39575003, 361695, G06F 132
Patent
active
058482822
ABSTRACT:
A computer system capable of controlling rotation speed of a cooling fan which is used for cooling down heat of a microprocessor chip. The computer system includes a power supply for receiving an AC voltage and generating DC voltages; a power management controller for allowing one of the DC voltage to be provided to the cooling fan in accordance with a power saving mode corresponding to an operation state of the computer system, the power saving mode being one of a normal operation mode, a stand-by mode, a sleep mode and a suspend mode; a power saving mode detector for detecting whether one power saving mode of the computer system is changed to another power saving mode, and generating a first and a second driving signals having different frequencies from each; a delay circuit for delaying the second driving signal for a constant time during the stand-by mode; and a fan driver for supplying a fan driving voltage for the cooling fan in response to the second driving signal to control rotation speed of the cooling fan.
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Bushnell Esq. Robert E.
Ray Gopal C.
Samsung Electronics Co,. Ltd.
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