Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Reexamination Certificate
2008-12-22
2010-12-07
Benson, Walter (Department: 2837)
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
C318S268000, C318S400080, C318S722000, C318S471000
Reexamination Certificate
active
07847508
ABSTRACT:
A heat dissipation system for an electronic device comprises a base, a fan, a pulse width modulation speed control circuit controlling the speed of the fan, a converter outputting a voltage signal, a selection switch connected to the motor, and a control element provided on the base, connected to the switch and to the converter. When the control element is operated, the switch selectively enables the motor be connected to the output of the pulse width modulation speed control circuit or to the output of the converter, and when the motor is electrically connected to the converter, the control element can modify the output voltage of the converter.
REFERENCES:
patent: 4879591 (1989-11-01), Takei
patent: 5744927 (1998-04-01), Hayashida
patent: 6671459 (2003-12-01), Bultman
patent: 6779981 (2004-08-01), Huang et al.
patent: 7323836 (2008-01-01), Lin et al.
patent: 7447423 (2008-11-01), Chiu et al.
Benson Walter
Dinh Thai
Hon Hai Precision Industry Co. Ltd.
Ma Zhigang
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