TW201338400A - Fan control device and fan control method and cooling system thereof - Google Patents
Fan control device and fan control method and cooling system thereof Download PDFInfo
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- TW201338400A TW201338400A TW101106917A TW101106917A TW201338400A TW 201338400 A TW201338400 A TW 201338400A TW 101106917 A TW101106917 A TW 101106917A TW 101106917 A TW101106917 A TW 101106917A TW 201338400 A TW201338400 A TW 201338400A
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- 238000000034 method Methods 0.000 title claims description 15
- 238000001816 cooling Methods 0.000 title description 8
- 230000017525 heat dissipation Effects 0.000 claims description 21
- 238000010586 diagram Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
Description
本發明係指一種風扇控制裝置及其風扇控制方法與散熱系統，尤指一種可於高海拔環境下提高風扇之最大可運作轉速，以提升風扇效能並節省風扇成本的風扇控制裝置及其風扇控制方法與散熱系統。The invention relates to a fan control device, a fan control method thereof and a heat dissipation system, in particular to a fan control device capable of improving the maximum operable speed of a fan in a high altitude environment, thereby improving fan performance and saving fan cost, and fan control thereof Method and cooling system.
現今電子構裝散熱系統如果以成本與可靠度為考量，多以氣冷為散熱系統主流。然而，由於氣冷散熱系統之散熱能力與空氣密度具有高關聯性(其透過空氣分子熱對流以進行散熱)，因此相較於低海拔高空氣密度之環境，氣冷散熱系統在高海拔(如3000～4000英呎以上)低空氣密度之環境下散熱能力會大幅下降。因此，目前散熱系統除了考慮低海拔下之散熱外，還必須考量高海拔下的散熱設計以符合需求，即需考量因空氣密度降低導致熱對流能力下降與散熱能力下降之缺點。Nowadays, if the electronic assembly cooling system is based on cost and reliability, air cooling is the mainstream of the cooling system. However, since the heat dissipation capability of the air-cooled heat dissipation system is highly correlated with the air density (which is convected by air molecules for heat dissipation), the air-cooled heat dissipation system is at a high altitude compared to the environment of low altitude and high air density (eg, The heat dissipation capacity in the environment of low air density will be greatly reduced in the range of 3000 to 4000 inches. Therefore, in addition to considering the heat dissipation at low altitudes, the current cooling system must also consider the heat dissipation design at high altitude to meet the demand, that is, the shortcomings of the decrease in heat convection capability and the decrease in heat dissipation capacity due to the decrease in air density are considered.
在此情況下，習知散熱系統一般以增加風扇數量，或是過度設計(overdesign)而選用更高性能的風扇(即較一般純低海拔使用之風扇能以更高電流驅動以達到更高轉速進行散熱)以滿足高海拔下的散熱需求，抑或更甚者只能降低系統效能減少廢熱的產生以配合高海拔下的風扇性能損失。In this case, the conventional heat dissipation system generally uses a higher performance fan to increase the number of fans or overdesign (ie, a fan that is used at a higher pure altitude than the general low-altitude fan can be driven at a higher current to achieve a higher speed. Cooling is required to meet the heat dissipation requirements at high altitudes, or even lower the system performance to reduce the generation of waste heat to match the performance loss of the fan at high altitudes.
然而，為了高海拔需求增加風扇數量會造成成本上升，而過度設計而選用更高性能的風扇除了造成成本上升外，於低海拔無法完全發揮其效能而造成浪費。有鑑於此，習知技術實有改進之必要。However, increasing the number of fans for high-altitude demand will increase the cost, while over-engineering and higher-performance fans will not be able to fully utilize their performance at low altitudes, resulting in waste. In view of this, the prior art has been improved.
因此，本發明之主要目的即在於提供一種可於高海拔提高風扇之最大可運作轉速，以提升風扇效能並節省風扇成本的風扇控制裝置及其風扇控制方法與散熱系統。Therefore, the main object of the present invention is to provide a fan control device, a fan control method and a heat dissipation system capable of increasing the maximum operable speed of the fan at a high altitude to improve the fan performance and save the fan cost.
本發明另揭露一種風扇控制裝置，用來控制風扇。該風扇控制裝置包含有氣壓感測計，用來偵測該風扇之操作環境之大氣壓力；以及最大轉速設定單元，用來根據該大氣壓力之大小，設定該風扇之最大可運作轉速。The invention further discloses a fan control device for controlling a fan. The fan control device includes a barometric pressure sensor for detecting an atmospheric pressure of an operating environment of the fan, and a maximum speed setting unit configured to set a maximum operable speed of the fan according to the atmospheric pressure.
本發明另揭露一種風扇控制方法，用來控制風扇。該風扇控制方法包含有偵測該風扇之操作環境之大氣壓力；以及根據該大氣壓力之大小，設定該風扇之最大可運作轉速。The invention further discloses a fan control method for controlling a fan. The fan control method includes detecting an atmospheric pressure of an operating environment of the fan; and setting a maximum operable speed of the fan according to the magnitude of the atmospheric pressure.
本發明另揭露一種散熱系統，該散熱系統包含有風扇；以及風扇控制裝置，用來控制該風扇。該風扇控制裝置包含有氣壓感測計，用來偵測該風扇之操作環境之大氣壓力；以及最大轉速設定單元，用來根據該大氣壓力之大小，設定該風扇之最大可運作轉速。The invention further discloses a heat dissipation system including a fan; and a fan control device for controlling the fan. The fan control device includes a barometric pressure sensor for detecting an atmospheric pressure of an operating environment of the fan, and a maximum speed setting unit configured to set a maximum operable speed of the fan according to the atmospheric pressure.
請參考第1圖，第1圖為本發明實施例一散熱系統10之示意圖。如第1圖所示，散熱系統10包含一風扇102以及一風扇控制裝置104。風扇控制裝置104可控制風扇102，其包含有一氣壓感測計106以及一最大轉速設定單元108。簡單來說，氣壓感測計106可偵測風扇102之操作環境之一大氣壓力AP，而最大轉速設定單元108則可根據大氣壓力AP之大小，設定風扇102之一最大可運作轉速MORS。Please refer to FIG. 1 , which is a schematic diagram of a heat dissipation system 10 according to an embodiment of the present invention. As shown in FIG. 1, the heat dissipation system 10 includes a fan 102 and a fan control device 104. The fan control unit 104 can control the fan 102, which includes a pneumatic sensor 106 and a maximum speed setting unit 108. Briefly, the barometric pressure sensor 106 can detect an atmospheric pressure AP of one of the operating environments of the fan 102, and the maximum speed setting unit 108 can set the maximum operable rotational speed MORS of the fan 102 according to the magnitude of the atmospheric pressure AP.
由於高海拔下空氣密度較低的特性，空氣阻力對於風扇102本身造成的負載也會降低，因此消耗相同能量下風扇102可具有較高轉速。在此情況下，使得風扇控制裝置104於低海拔下可將風扇102之最大可運作轉速MORS設定為低海拔下所能承受之一預設低海拔最大可運作轉速DLMORS(即低海拔下施以所能承受之最大能量所達到之轉速)，而於高海拔下可將風扇102之最大可運作轉速MORS設定為高海拔下所能承受且大於預設低海拔最大可運作轉速DLMORS之一高海拔最大可運作轉速HMORS(即高海拔下施以所能承受之最大能量所達到之轉速)。如此一來，由於風扇控制裝置104可偵測風扇102之操作環境之大氣壓力AP，而於高海拔時提高風扇102之最大可運作轉速MORS以提升效能，因此不需增加風扇數量或過度設計(overdesign)選用更高性能的風扇而能節省成本。Due to the low air density at high altitudes, the air resistance will also reduce the load on the fan 102 itself, so the fan 102 can have a higher rotational speed when the same energy is consumed. In this case, the fan control device 104 can set the maximum operable rotational speed MORS of the fan 102 to a preset low altitude maximum operable speed DLMROS at a low altitude at a low altitude (ie, at a low altitude) The maximum energy that can be withstood by the maximum energy can be set, and the maximum operable speed MORS of the fan 102 can be set at a high altitude to be able to withstand high altitude and greater than the preset low altitude maximum operable speed DLMORS high altitude Maximum operating speed HMORS (ie the speed at which the maximum energy can be tolerated at high altitudes). In this way, since the fan control device 104 can detect the atmospheric pressure AP of the operating environment of the fan 102 and increase the maximum operable rotational speed MORS of the fan 102 at high altitude to improve performance, there is no need to increase the number of fans or excessive design ( Overdesign) Saves costs by using a higher performance fan.
詳細來說，請參考第2圖，第2圖為本發明實施例一風扇控制流程20之詳細示意圖。風扇控制流程20係用於風扇控制裝置104以設定風扇102之最大可運作轉速MORS，包含有以下步驟：For details, please refer to FIG. 2, which is a detailed schematic diagram of a fan control flow 20 according to an embodiment of the present invention. The fan control flow 20 is for the fan control unit 104 to set the maximum operational speed MORS of the fan 102, including the following steps:
步驟200：開始。Step 200: Start.
步驟202：偵測風扇102之操作環境之大氣壓力AP。若大氣壓力AP大於一預設大氣壓力DAP，則進行步驟204；若否，則進行步驟206，其中將風扇102驅動時，風扇102之一操作電流為Ia。Step 202: Detect the atmospheric pressure AP of the operating environment of the fan 102. If the atmospheric pressure AP is greater than a predetermined atmospheric pressure DAP, proceed to step 204; if not, proceed to step 206, wherein when the fan 102 is driven, one of the operating forces of the fan 102 is Ia.
步驟204：判斷位於低海拔高度，設定風扇102之最大可運作轉速MORS為預設低海拔最大可運作轉速DLMORS，其中將風扇102驅動於預設低海拔最大可運作轉速DLMORS時，風扇102之該操作電流Ia為一最大操作電流Id。Step 204: Determine that the maximum operable speed MORS of the fan 102 is a preset low altitude maximum operable speed DLMORS, wherein the fan 102 is driven when the fan 102 is driven to a preset low altitude maximum operable speed DLMORS. The operating current Ia is a maximum operating current Id.
步驟206：判斷位於高海拔高度，提高風扇102之最大可運作轉速MORS。Step 206: Determine to be at a high altitude and increase the maximum operable rotational speed MORS of the fan 102.
步驟208：判斷操作電流Ia是否小於最大操作電流Id。若是，則進行步驟206；若否，則進行步驟210。Step 208: Determine whether the operating current Ia is less than the maximum operating current Id. If yes, proceed to step 206; if no, proceed to step 210.
步驟210：於風扇102之操作電流Ia等於最大操作電流Id時，設定風扇102之最大可運作轉速MORS為高海拔最大可運作轉速HMORS，其中高海拔最大可運作轉速HMORS為以最大操作電流Id驅動時風扇102之轉速。Step 210: When the operating current Ia of the fan 102 is equal to the maximum operating current Id, set the maximum operable rotational speed MORS of the fan 102 to a high altitude maximum operable speed HMORS, wherein the high altitude maximum operable speed HMORS is driven by the maximum operating current Id. The speed of the fan 102.
根據風扇控制流程20，風扇控制裝置104先偵測風扇102之操作環境之大氣壓力AP，若大氣壓力AP大於預設大氣壓力DAP，則判斷位於低海拔高度，因此設定風扇102之最大可運作轉速MORS為預設低海拔最大可運作轉速DLMORS，其為低海拔下風扇102之操作電流Ia為最大操作電流Id(即風扇102所能承受之最大能量)時風扇102之轉速。如此一來，由於低海拔時能將風扇102之最大可運作轉速MORS設定為其所能承受之最大能量時之轉速，因此可完全發揮風扇102之效能。According to the fan control process 20, the fan control device 104 first detects the atmospheric pressure AP of the operating environment of the fan 102, and if the atmospheric pressure AP is greater than the preset atmospheric pressure DAP, it is determined to be at a low altitude, thereby setting the maximum operable speed of the fan 102. The MORS is a preset low altitude maximum operable speed DLMORS, which is the rotational speed of the fan 102 when the operating current Ia of the fan 102 at low altitude is the maximum operating current Id (ie, the maximum energy that the fan 102 can withstand). In this way, since the maximum operable rotational speed MORS of the fan 102 can be set to the maximum energy that can be withstood at a low altitude, the performance of the fan 102 can be fully utilized.
另一方面，若大氣壓力AP小於預設大氣壓力DAP，則判斷位於高海拔高度，因此可設定風扇102之最大可運作轉速MORS大於預設低海拔最大可運作轉速DLMORS(因高海拔下空氣密度較低時，相同可承受最大能量下風扇102可具有較高轉速)。此時風扇控制裝置104可先提高風扇102之最大可運作轉速MORS，然後判斷相對應操作電流Ia是否小於最大操作電流Id。若操作電流Ia小於最大操作電流Id，則可持續提高風扇102之最大可運作轉速MORS，直到風扇102之操作電流Ia等於最大操作電流Id時，設定風扇102之最大可運作轉速MORS為高海拔最大可運作轉速HMORS，其為高海拔下以最大操作電流Id(即風扇102所能承受之最大能量)驅動時風扇102之轉速。在此情況下，於透過上述操作得到高海拔最大可運作轉速HMORS後，於下次操作時，若風扇控制裝置104偵測大氣壓力AP再次小於預設大氣壓力DAP而再次判斷位於高海拔環境，則可直接將最大可運作轉速MORS設定為高海拔最大可運作轉速HMORS，以縮短回路判斷的時間，提高風扇效率。如此一來，由於於高海拔時空氣密度較低，可提高風扇102之最大可運作轉速MORS將其設定為風扇102所能承受之最大能量時之轉速，因此可完全發揮適用於低海拔之風扇102之效能以滿足高海拔之環境(即低海拔或高海拔之環境皆可完全發揮風扇102之效能)，而不需如習知技術使用更高性能的風扇。On the other hand, if the atmospheric pressure AP is less than the preset atmospheric pressure DAP, it is judged to be at a high altitude, so the maximum operable rotational speed MORS of the fan 102 can be set to be greater than the preset low altitude maximum operable rotational speed DLMORS (due to the high altitude air density) At lower times, the fan 102 can have a higher rotational speed when the same maximum energy can withstand. At this time, the fan control device 104 may first increase the maximum operable rotational speed MORS of the fan 102, and then determine whether the corresponding operating current Ia is less than the maximum operating current Id. If the operating current Ia is less than the maximum operating current Id, the maximum operable rotational speed MORS of the fan 102 can be continuously increased until the operating current Ia of the fan 102 is equal to the maximum operating current Id, and the maximum operable rotational speed MORS of the fan 102 is set to be the highest altitude. The operable speed HMORS is the speed of the fan 102 when driven at a high altitude with a maximum operating current Id (ie, the maximum energy that the fan 102 can withstand). In this case, after the high-altitude maximum operable speed HMORS is obtained through the above operation, in the next operation, if the fan control device 104 detects that the atmospheric pressure AP is again less than the preset atmospheric pressure DAP and then judges that it is located in the high altitude environment, The maximum operable speed MORS can be directly set to the high altitude maximum operable speed HMORS to shorten the loop judgment time and improve the fan efficiency. In this way, since the air density is low at high altitudes, the maximum operable speed of the fan 102 can be increased to set the speed at which the fan 102 can withstand the maximum energy, so that the fan suitable for low altitude can be fully utilized. The performance of 102 meets the high altitude environment (ie, the performance of the fan 102 can be fully utilized in low altitude or high altitude environments) without the need for higher performance fans as is known in the art.
值得注意的是，本發明之主要精神在於可偵測風扇102之操作環境之大氣壓力AP，以於高海拔時提高風扇102之最大可運作轉速MORS以提升效能，因此不需增加風扇數量或過度設計選用更高性能的風扇而能節省成本。本領域具通常知識者當可據以變化而不限於此。舉例來說，上述實施例係以氣壓感測計106判斷為低海拔或高海拔後，設定風扇102之最大可運作轉速MORS，在其它實施例中，風扇控制裝置104亦可不包含氣壓感測計106，而以操作電流Ia是否小於最大操作電流Id作為提高風扇102之最大可運作轉速MORS之依據(即各種環境下皆以當時最大操作電流Id所對應之轉速做為最大可運作轉速MORS)，唯其需持續比較操作電流Ia與最大操作電流Id，可能造成系統不穩定。It is worth noting that the main spirit of the present invention is to detect the atmospheric pressure AP of the operating environment of the fan 102, so as to increase the maximum operable rotational speed MORS of the fan 102 at high altitudes to improve performance, so there is no need to increase the number or excessive number of fans. The design uses a higher performance fan to save costs. Those of ordinary skill in the art are subject to change and are not limited thereto. For example, in the above embodiment, after determining that the air pressure sensor 106 is at a low altitude or a high altitude, the maximum operable rotational speed MORS of the fan 102 is set. In other embodiments, the fan control device 104 may not include the air pressure sensor. 106, and whether the operating current Ia is less than the maximum operating current Id as the basis for increasing the maximum operable rotational speed MORS of the fan 102 (ie, the rotational speed corresponding to the maximum operating current Id at each time is used as the maximum operable rotational speed MORS in various environments), Only it needs to continuously compare the operating current Ia with the maximum operating current Id, which may cause system instability.
在習知技術中，為了高海拔需求增加風扇數量會造成成本上升，而過度設計而選用更高性能的風扇除了造成成本上升外，於低海拔無法完全發揮其效能而造成浪費。相較之下，本發明可偵測風扇102之操作環境之大氣壓力AP，以於高海拔時提高風扇102之最大可運作轉速MORS以提升效能，因此不需增加風扇數量或過度設計選用更高性能的風扇而能節省成本。In the prior art, increasing the number of fans for high altitude demand causes an increase in cost, and the excessively designed and selected higher performance fan not only causes cost increase, but also fails to fully exert its performance at low altitude and waste. In contrast, the present invention can detect the atmospheric pressure AP of the operating environment of the fan 102 to improve the maximum operable rotational speed MORS of the fan 102 at a high altitude to improve performance, so that there is no need to increase the number of fans or excessive design. A performance fan can save costs.
以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
10．．．散熱系統10. . . cooling system
102．．．風扇102. . . fan
104．．．風扇控制裝置104. . . Fan control unit
106．．．氣壓感測計106. . . Barometric sensor
108．．．最大轉速設定單元108. . . Maximum speed setting unit
20．．．流程20. . . Process
200～210．．．步驟200~210. . . step
AP．．．大氣壓力AP. . . Atmospheric pressure
MORS．．．最大可運作轉速MORS. . . Maximum operable speed
第1圖為本發明實施例一散熱系統之示意圖。FIG. 1 is a schematic diagram of a heat dissipation system according to an embodiment of the present invention.
第2圖為本發明實施例一風扇控制流程之詳細示意圖。FIG. 2 is a detailed schematic diagram of a fan control process according to an embodiment of the present invention.
20．．．流程20. . . Process
200～210．．．步驟200~210. . . step
Claims (15)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101106917A TW201338400A (en) | 2012-03-02 | 2012-03-02 | Fan control device and fan control method and cooling system thereof |
| CN2012100758725A CN103291636A (en) | 2012-03-02 | 2012-03-21 | Fan control device, fan control method and heat dissipation system |
| US13/772,356 US20130230397A1 (en) | 2012-03-02 | 2013-02-21 | Fan Control Device and Fan Control Method and Cooling System Thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101106917A TW201338400A (en) | 2012-03-02 | 2012-03-02 | Fan control device and fan control method and cooling system thereof |
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| TW201338400A true TW201338400A (en) | 2013-09-16 |
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| TW101106917A TW201338400A (en) | 2012-03-02 | 2012-03-02 | Fan control device and fan control method and cooling system thereof |
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| US (1) | US20130230397A1 (en) |
| CN (1) | CN103291636A (en) |
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| CN103968805B (en) * | 2014-06-04 | 2017-02-15 | 郑州云海信息技术有限公司 | Method for testing and correcting altitude for working of server by virtue of back pressure of fan |
| CN104182018A (en) * | 2014-09-11 | 2014-12-03 | 浪潮电子信息产业股份有限公司 | Method for performing server cooling through atmospheric pressure changes |
| TWI533792B (en) * | 2015-03-17 | 2016-05-11 | 緯創資通股份有限公司 | Heat dissipating control module and related server device and heat dissipating control method |
| JP2017072100A (en) * | 2015-10-08 | 2017-04-13 | コベルコ建機株式会社 | Fan control device for construction machine |
| CN105828577B (en) * | 2016-03-28 | 2019-03-08 | 联想(北京)有限公司 | Electronic equipment and its control method |
| CN106502346A (en) * | 2016-10-17 | 2017-03-15 | 郑州云海信息技术有限公司 | A kind of method and device of server radiating |
| CN111043065B (en) * | 2019-11-19 | 2022-05-13 | 中车株洲电力机车有限公司 | Air cooling system and air cooling control method of mobile equipment |
| CN111140528A (en) * | 2019-12-24 | 2020-05-12 | 无锡艾柯威科技有限公司 | Control method for maximum rotating speed of fan motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2554866Y (en) * | 2002-06-20 | 2003-06-04 | 蔺凯琳 | Drive circuit of variable speed DC brushless fan controlled by computer |
| US6824362B2 (en) * | 2002-07-15 | 2004-11-30 | Adc Dsl Systems, Inc. | Fan control system |
| US20050019162A1 (en) * | 2003-07-25 | 2005-01-27 | Delano Andrew D. | Utilizing an altitude sensor to control fan speed |
| TWI233529B (en) * | 2004-03-12 | 2005-06-01 | Coretronic Corp | A control method of a projection display |
| JP4516411B2 (en) * | 2004-11-16 | 2010-08-04 | 本田技研工業株式会社 | Manufacturing method for internal teeth member |
| DE602006000840T2 (en) * | 2005-03-30 | 2009-04-09 | Lg Electronics Inc. | Cooling device and control method for it |
| US20070027580A1 (en) * | 2005-07-14 | 2007-02-01 | Ligtenberg Chris A | Thermal control of an electronic device for adapting to ambient conditions |
| US7369757B2 (en) * | 2006-05-24 | 2008-05-06 | Nellcor Puritan Bennett Incorporated | Systems and methods for regulating power in a medical device |
| CN101908013A (en) * | 2009-06-04 | 2010-12-08 | 纬创资通股份有限公司 | Pressure sensing device, pressure sensing method and heat dissipation device for electronic device |
| CN102231041A (en) * | 2011-06-07 | 2011-11-02 | 苏州佳世达光电有限公司 | Projector, projector fan rotating speed adjusting device and adjusting method thereof |
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- 2012-03-02 TW TW101106917A patent/TW201338400A/en unknown
- 2012-03-21 CN CN2012100758725A patent/CN103291636A/en active Pending
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| CN103291636A (en) | 2013-09-11 |
| US20130230397A1 (en) | 2013-09-05 |
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