Title:
FAN CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP2018040325
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a fan control system configured to perform control so that a rotational frequency of a fan subjected to PWM control is prevented from exceeding a target rotational frequency.SOLUTION: A rotation controller 4 is configured to, in a case of performing rotational frequency control so that a rotational frequency of a fan motor 11 increases to a target rotational frequency TR, with a rotational frequency change ratio K calculated by K=CR/CD using a rotational frequency CR of a current fan motor 11 and a duty ratio CD of a PWM signal PS that a PWM driving unit 3 outputs to the current fan motor 11, calculate a target duty ratio TD by TD=CD+{(TR-CR/)K}; and change the duty ratio of the PWM signal PS output by the PWM driving unit 3 to the target duty ratio TD.SELECTED DRAWING: Figure 1
Inventors:
HASHIMOTO YUKI
SHIMADA MASAYA
SHIMADA MASAYA
Application Number:
JP2016176065A
Publication Date:
March 15, 2018
Filing Date:
September 09, 2016
Export Citation:
Assignee:
ALPINE ELECTRONICS INC
International Classes:
F04D27/00; H02P7/29
Domestic Patent References:
| JPH0670594A | 1994-03-11 | |||
| JP2002089484A | 2002-03-27 | |||
| JP2013118745A | 2013-06-13 | |||
| JP2008109835A | 2008-05-08 |
Attorney, Agent or Firm:
Katsushi Sato
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