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Patent Searching and Data


Title:
FAN MOTOR DRIVE DEVICE AND COOLER
Document Type and Number:
WIPO Patent Application WO/2006/033214
Kind Code:
A1
Abstract:
A fan motor drive device capable of flexibly setting the rotational speed of a cooling fan. The fan motor drive device (100) drives the fan at the number of revolutions based on a control voltage (Vcont) and an ambient temperature (Ta) to cool a CPU to be cooled. A first control section (10) includes a thermistor (Rth) and a first resistor (R1), and multiplies the control voltage (Vcont) by a first coefficient dependent on the ambient temperature (Ta) to output the result as a first voltage (V1). A second control section (20) multiplies the control voltage (Vcont) by a predetermined coefficient to output the result as a second voltage (V2). A selection section (30) selects the higher one of the first and second voltages (V1, V2) as a voltage (Vx) and outputs it to a drive control section (40). The drive control section (40) drives a fan motor (110) based on the voltage (Vx).

Inventors:
Sakaguchi, Takahiro c/o Rohm Co. Ltd. (21, Saiin Mizosaki-Cho, Ukyo-k, Kyoto-shi Kyoto 85, 61585, JP)
Application Number:
PCT/JP2005/015532
Publication Date:
March 30, 2006
Filing Date:
August 26, 2005
Export Citation:
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Assignee:
ROHM CO., LTD (21 Saiin Mizosaki-Cho, Ukyo-ku Kyoto-shi Kyoto, 85, 61585, JP)
Sakaguchi, Takahiro c/o Rohm Co. Ltd. (21, Saiin Mizosaki-Cho, Ukyo-k, Kyoto-shi Kyoto 85, 61585, JP)
International Classes:
H02P7/29
Foreign References:
JPH037092A
JP2004023999A
JP3092684U
JPH09233888A
JPH0470904A
JP2000080858A
Attorney, Agent or Firm:
Morishita, Sakaki (2-11-12, Ebisu-Nishi Shibuya-k, Tokyo 21, 15000, JP)
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