US20130336760A1 - Fan control method, fan model identification method, and fan control circuit - Google Patents

Fan control method, fan model identification method, and fan control circuit Download PDF

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Publication number
US20130336760A1
US20130336760A1 US13/755,148 US201313755148A US2013336760A1 US 20130336760 A1 US20130336760 A1 US 20130336760A1 US 201313755148 A US201313755148 A US 201313755148A US 2013336760 A1 US2013336760 A1 US 2013336760A1
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Prior art keywords
fan
rotational speed
control
control circuit
feedback signal
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Abandoned
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US13/755,148
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English (en)
Inventor
Hsi-Pin Li
Che-Ting Li
Keng-Wei Shih
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Lite On Technology Corp
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Lite On Technology Corp
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Assigned to LITE-ON ELECTRONICS (GUANGZHOU) LIMITED, LITE-ON TECHNOLOGY CORP. reassignment LITE-ON ELECTRONICS (GUANGZHOU) LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LI, CHE-TING, LI, HSI-PIN, SHIH, KENG-WEI
Publication of US20130336760A1 publication Critical patent/US20130336760A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to a control method, more particularly to a fan control method which performs corresponding control according to different models of fans.
  • the shape of an electronic device has developed toward a miniaturized and compact design as electronic technology advances. On the other hand, more heat may be generated as a result of operation of the electronic device. Once the heat is not dissipated timely from the electronic device, an internal temperature of the electronic device may rise because of accumulated heat, and performance of the electronic device may be adversely influenced.
  • a fan is usually utilized in the projector for facilitating fast heat dissipation by virtue of airflow resulting from fan rotation.
  • one projector model may be designed for use with more than one model of fans. Different rotational speed feedback signals may be obtained in response to the same pulse-width modulation (PWM) input signal, since each model of fans has distinct specifications.
  • PWM pulse-width modulation
  • a method for identifying a model of a fan is to add an ID pin to the fan, such that the model may be identified via the ID pin using a control program.
  • this method requires additional hardware cost and increases complexity in manufacturing.
  • an object of the present invention is to provide a fan control method which facilitates optimal temperature control.
  • the fan control method of the present invention is to be implemented by a control circuit for controlling a fan coupled thereto.
  • the fan control method comprises:
  • step (C) configuring the control circuit to identify a model of the fan according to the feedback signal generated in step (B);
  • step (D) configuring the control circuit to control rotation of the fan according to the model identified in step (C).
  • Another object of the present invention is to provide a fan model identification method which facilitates identification of a model of a fan.
  • the fan model identification method of the present invention is to be implemented by a control circuit for identifying a model of a fan coupled thereto.
  • the fan model identification method comprises:
  • step (c) configuring the control circuit to identify a model of the fan according to the feedback signal generated in step (b).
  • Yet another object of the present invention is to provide a fan control circuit which does not require an additional ID pin so as to reduce hardware cost while simplifying manufacturing.
  • the fan control circuit of the present invention is adapted for controlling a fan coupled thereto.
  • the fan control circuit comprises a pulse-width modulation (PWM) module, a detection module and a control module.
  • the pulse-width modulation (PWM) module is to be coupled electrically to the fan, and is configured to output a driving signal to the fan such that the fan rotates according to the driving signal.
  • the detection module is to be coupled electrically to the fan, and is configured to detect a rotational speed of the fan and to generate a feedback signal corresponding to the rotational speed thus detected.
  • the control module is coupled electrically to the PWM module and the detection module, and is configured to identify a model of the fan according to the feedback signal generated by the detection module and to control rotation of the fan according to the model thus identified.
  • Effects of the present invention reside in that, by detecting the rotational speed of the fan so as to quickly identify the model of the fan, corresponding thermal control algorithms maybe applied according to different models of the fans. In this way, the fan is controllable with required parameters such that an effect of optimal temperature control may be achieved. Further, an additional ID pin is not required for identifying the model of the fan, such that hardware cost is reduced and complexity in manufacturing is simplified.
  • FIG. 1 is a block diagram illustrating a preferred embodiment of a fan control circuit according to the present invention
  • FIG. 2 is a flow chart illustrating a preferred embodiment of a fan control method according to the present invention
  • FIG. 3 illustrates specification parameters, which are associated with different fan models of fans, stored in a memory module of the preferred embodiment
  • FIG. 4 is a plot illustrating relationship between duty cycles and rotational speeds of two fan models in the preferred embodiment.
  • a fan device 100 is shown to include a fan 10 and a preferred embodiment of a fan control circuit 20 of the present invention that is coupled electrically to the fan 10 .
  • the fan device 100 is to be applied in a micro projector, and utilizes the fan control circuit 20 to detect a rotational speed of the fan 10 and to generate a feedback signal corresponding to the rotational speed thus detected, so as to identify a model (or ID) of the fan 10 for fast setting of initial parameters of the fan 10 , such that the fan 10 may have optimal rotational speed and temperature control.
  • the fan device 100 is applicable to any electronic device which requires heat dissipation, such as a computer, a video card, etc., and is not limited to the disclosure in this embodiment.
  • the control circuit 20 comprises a pulse-width modulation (PWM) module 21 , a detection module 23 , a control module 22 , a memory module 24 , and a display module 25 .
  • the PWM module 21 is to be coupled electrically to the fan 10 , and is configured to output a driving signal to the fan 10 such that the fan 10 rotates according to the driving signal. Specifically, a rotation speed at which the fan 10 rotates is adjusted according to the driving signal.
  • the driving signal is a pulse signal having a specific duty cycle.
  • the detection module 23 is to be coupled electrically to the fan 10 , and is configured to detect the rotational speed of the fan 10 and to generate a feedback signal corresponding to the rotational speed thus detected.
  • the control module 22 is coupled electrically to the PWM module 21 and the detection module 23 , and is configured to control operations of the various components in the fan control circuit 20 . Details of the control method of the control module 22 will be described in the following paragraphs.
  • the memory module 24 is a memory, is coupled electrically to the control module 22 , and stores specification parameters of fans and thermal control algorithms. The specification parameters include a plurality of fan models of the fans, and a plurality of rotational speeds corresponding respectively to the fan models (or IDs) of the fans when driven by a signal with the specific duty cycle.
  • the display module 25 is coupled electrically to the control module 22 for providing information relevant to operation of the fan 10 .
  • FIG. 2 in combination with FIG. 1 , a preferred embodiment of a fan control method to be implemented by the fan control circuit 20 according to the present invention is described in the following.
  • step S 10 the control module 22 is configured to control the PWM module 21 to output the driving signal to the fan 10 such that the fan 10 rotates according to the driving signal.
  • the driving signal is a pulse signal having a specific duty cycle.
  • the memory module 24 stores first and second specification parameters, and first and second thermal control algorithms.
  • Each of the first and second specification parameters includes a respective one of first and second fan models (ID 1 and ID 2 ), and a plurality of rotational speeds corresponding respectively to the first and second fan models (ID 1 and ID 2 ) of the fans 10 when driven by signals of different duty cycles.
  • the first thermal control algorithm corresponds to the first fan model (ID 1 )
  • the second thermal control algorithm corresponds to the second fan model (ID 2 ).
  • FIG. 4 is a plot illustrating relationship between duty cycles and rotational speeds of the first and second fan models (ID 1 and ID 2 ).
  • a horizontal axis represents the duty cycle of the pulse signal outputted by the PWM module 21
  • a vertical axis represents the rotational speeds corresponding to the first and second fan models (ID 1 and ID 2 )
  • a curve L 1 represents the relationship between the duty cycle and the rotational speed corresponding to the first fan model (ID 1 )
  • a curve L 2 represents the relationship between the duty cycle and the rotational speed corresponding to the second fan model (ID 2 ).
  • step S 10 of this embodiment the PWM module 21 is controlled to output the pulse signal having the specific duty cycle of 60%, such that different models of the fans 10 are driven to rotate at corresponding rotational speeds having a relatively significant difference therebetween for facilitating identification of the model of the fan 10 .
  • the specific duty cycle of the pulse signal is not limited to the duty cycle at which different models of fans 10 operate such that a maximum difference exists between the rotational speeds of the different models of fans 10 .
  • the specific duty cycle of the pulse signal may be selected according to specifications and characteristics of different fans 10 , and is not limited to the disclosure in this embodiment.
  • step S 20 is performed.
  • the detection module 23 is configured to detect the rotational speed of the fan 10 and to generate a feedback signal corresponding to the rotational speed thus detected, and then transmit the feedback signal to the control module 22 .
  • the feedback signal is associated with the rotational speed at which the fan 10 rotates. When the fan 10 rotates faster, a higher value of the feedback signal is generated, and vice versa.
  • step S 30 the control module 22 is configured to identify a model of the fan 10 according to the feedback signal generated by the detection module 23 .
  • Step S 30 includes the following sub-steps.
  • step S 31 the control module 22 is configured to determine whether the feedback signal corresponds to a first rotational speed range (FG 1 ), wherein when it is determined that the feedback signal corresponds to the first rotational speed range (FG 1 ), the flow proceeds to step S 41 . Otherwise, when it is determined that the feedback signal does not correspond to the first rotational speed range (FG 1 ), the flow proceeds to Step S 32 .
  • the first rotational speed range (FG 1 ) is set to a range, which is the rotational speed plus or minus 15% of the rotational speed that corresponds to the first fan model (ID 1 ) of the fan 10 driven by the pulse signal having the specific duty cycle of 60% and that is stored as the specification parameter in the memory module 24 .
  • the control module 22 is configured to identify the model of the fan 10 as the first fan model (ID 1 ). Subsequently, in step S 41 , the control module 22 is configured to control rotation of the fan 10 based on the first thermal control algorithm.
  • step S 32 the control module 22 is configured to determine whether the feedback signal corresponds to a second rotational speed range (FG 2 ), wherein when it is determined that the feedback signal corresponds to the second rotational speed range (FG 2 ), the flow proceeds to step S 42 . Otherwise, when it is determined that the feedback signal does not correspond to the second rotational speed range (FG 2 ), the flow proceeds to step S 50 .
  • the second rotational speed range (FG 2 ) is set to a range, which is the rotational speed plus or minus 15% of the rotational speed that corresponds to the second fan model (ID 2 ) of the fan 10 driven by the pulse signal having the specific duty cycle of 60% and that is stored as the specification parameter in the memory module 24 .
  • the control module 22 is configured to identify the model of the fan 10 as the second fan model (ID 2 ). Subsequently, in step S 42 , the control module 22 is configured to control rotation of the fan 10 based on the second thermal control algorithm.
  • first and second rotational speed ranges should not be limited to the plus or minus 15% ranges of the rotational speeds, and may be modified according to different specifications and needs.
  • an initial rotational speed of the fan 10 is adjusted to a moderate rotational speed (i.e., lower than a rotational speed at the final equilibrium temperature and higher than a lowest rotational speed of the fan 10 ), such that noise resulting from rotation of the fan 10 may be reduced while fast thermal equilibrium may be achieved in the micro projector.
  • step S 50 is performed.
  • the control module 22 is configured to control the display module 25 to provide an error notification, so as to inform users that the model of the fan 10 is unidentifiable.
  • the model of the fan 10 may be quickly identified, without requiring an additional ID pin for the fan 10 .
  • the control circuit 20 is configured to control rotation of different models of the fans based on corresponding thermal control algorithms, and corresponding control parameters may be easily applied to the fan 10 so as to achieve optimal temperature control.
  • an ID pin of the fan 10 may be omitted so as to reduce the hardware cost and simplify the manufacturing procedure.
  • corresponding thermal control algorithms may be quickly applied to the fan 10 according to different fan models, so as to satisfy the need of heat dissipation in micro projectors and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
US13/755,148 2012-06-18 2013-01-31 Fan control method, fan model identification method, and fan control circuit Abandoned US20130336760A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210201016.X 2012-06-18
CN201210201016.XA CN103511306A (zh) 2012-06-18 2012-06-18 风扇的型号侦测方法及控制方法、控制电路及其装置

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Cited By (4)

* Cited by examiner, † Cited by third party
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US20140284926A1 (en) * 2013-03-19 2014-09-25 General Electric Company System and method for real-time load control of a wind turbine
CN106907343A (zh) * 2015-12-23 2017-06-30 新唐科技股份有限公司 风扇驱动***与风扇驱动模拟芯片
CN107035713A (zh) * 2017-05-25 2017-08-11 广东万和热能科技有限公司 一种直流风机类型的自动识别方法及装置
CN112493955A (zh) * 2020-11-10 2021-03-16 佛山市百斯特电器科技有限公司 一种洗涤设备的控制方法及洗涤设备

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CN105224047B (zh) * 2014-06-09 2019-01-08 华为技术有限公司 风扇、风扇控制器、电子设备及风扇识别方法
CN104863684B (zh) * 2015-06-09 2017-12-08 宝沃汽车（中国）有限公司 车辆及其冷却风扇电机的监控方法和监控***
CN111005892B (zh) * 2019-12-18 2021-06-18 迈普通信技术股份有限公司 自适应风扇电路、***、电子设备及风扇检测方法
CN112360788B (zh) * 2020-10-15 2023-04-21 宁畅信息产业(北京)有限公司 风扇稳定性测试方法、装置、计算机设备和存储介质
CN112780590A (zh) * 2021-01-22 2021-05-11 苏州浪潮智能科技有限公司 一种识别风扇型号的方法、***及装置
CN113032210B (zh) * 2021-03-10 2022-07-12 中科长城海洋信息***有限公司长沙分公司 一种服务器风扇自适应控制方法及其控制***

Family Cites Families (5)

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CN100385369C (zh) * 2003-06-27 2008-04-30 精拓科技股份有限公司 多段速智慧型风扇转速的控制装置与方法
JP2007124853A (ja) * 2005-10-31 2007-05-17 Toshiba Corp 情報処理装置およびファン制御方法
US7425812B2 (en) * 2005-11-23 2008-09-16 Standard Microsystems Corporation Ramp rate closed-loop control (RRCC) for PC cooling fans
CN101614217B (zh) * 2008-06-27 2011-11-30 中兴通讯股份有限公司 风扇转速控制方法和主控制器
CN101994718B (zh) * 2009-08-11 2014-12-17 鸿富锦精密工业（深圳）有限公司 风扇控制电路

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140284926A1 (en) * 2013-03-19 2014-09-25 General Electric Company System and method for real-time load control of a wind turbine
US9261077B2 (en) * 2013-03-19 2016-02-16 General Electric Company System and method for real-time load control of a wind turbine
CN106907343A (zh) * 2015-12-23 2017-06-30 新唐科技股份有限公司 风扇驱动***与风扇驱动模拟芯片
CN107035713A (zh) * 2017-05-25 2017-08-11 广东万和热能科技有限公司 一种直流风机类型的自动识别方法及装置
CN112493955A (zh) * 2020-11-10 2021-03-16 佛山市百斯特电器科技有限公司 一种洗涤设备的控制方法及洗涤设备

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Owner name: LITE-ON TECHNOLOGY CORP., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LI, HSI-PIN;LI, CHE-TING;SHIH, KENG-WEI;REEL/FRAME:029739/0020

Effective date: 20130125

Owner name: LITE-ON ELECTRONICS (GUANGZHOU) LIMITED, CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LI, HSI-PIN;LI, CHE-TING;SHIH, KENG-WEI;REEL/FRAME:029739/0020

Effective date: 20130125

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