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Patent Searching and Data


Title:
MOTOR DRIVE AND COOLER EMPLOYING IT
Document Type and Number:
WIPO Patent Application WO/2006/067975
Kind Code:
A1
Abstract:
There is provided motor drive capable of setting the r.p.m. of a fan motor flexibly depending on the temperature. In a fan motor drive circuit (100) for driving a motor based on a pulse modulated external control signal CNText, a temperature control signal generating section (10) generates a temperature control signal CNTtmp subjected to pulse modulation with a duty ratio dependent on the temperature. A signal synthesizing section (30) synthesizes the external control signal CNText and the temperature control signal CNTtmp by logical operation. A drive control section (40) drives the motor according to the output from the signal synthesizing section (30).

Inventors:
Miyajima, Satoshi c/o Rohm Co. Ltd. (21, Saiin Mizosaki-Cho, Ukyo-k, Kyoto-shi Kyoto 85, 61585, JP)
Application Number:
PCT/JP2005/022627
Publication Date:
June 29, 2006
Filing Date:
December 09, 2005
Export Citation:
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Assignee:
ROHM CO., LTD (21 Saiin Mizosaki-Cho, Ukyo-ku Kyoto-shi Kyoto, 85, 61585, JP)
Miyajima, Satoshi c/o Rohm Co. Ltd. (21, Saiin Mizosaki-Cho, Ukyo-k, Kyoto-shi Kyoto 85, 61585, JP)
International Classes:
H02P7/29; F25D1/00; H02P7/291; H05K7/20
Foreign References:
JPH1169858A1999-03-09
JPS63268487A1988-11-07
Attorney, Agent or Firm:
Morishita, Sakaki (2-11-12 Ebisu-Nishi, Shibuya-ku Tokyo, 21, 15000, JP)
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