Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Reexamination Certificate
2007-03-13
2007-03-13
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
C318S268000, C318S477000, C236S049300, C361S689000, C361S688000
Reexamination Certificate
active
10811850
ABSTRACT:
Embodiments of an apparatus and method can control a fan drive in a computer system. Such embodiments of apparatus and methods can alternately output a plurality of pulse width modulation (PWM) control signals at a predetermined time ratio and variably control a rotation speed of a cooling fan. The embodiments can use simple hardware based upon N-bit resolution in a PWM control signal generator included in the computer system for controlling the rotation speed of the cooling fan decreasing an internal temperature, such that the rotation speed of the cooling fan can be precisely and variably controlled, equally with the effect of an operation for controlling the fan drive using hardware based upon resolution of more than the N bits. Further, a physical configuration can be effectively simplified, and unnecessary power consumption can be reduced or prevented.
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Donovan Lincoln
Horn Robert W.
KED & Associates LLP
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