JP2008157052A - Fan speed control circuit - Google Patents

Fan speed control circuit Download PDF

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Publication number
JP2008157052A
JP2008157052A JP2006344154A JP2006344154A JP2008157052A JP 2008157052 A JP2008157052 A JP 2008157052A JP 2006344154 A JP2006344154 A JP 2006344154A JP 2006344154 A JP2006344154 A JP 2006344154A JP 2008157052 A JP2008157052 A JP 2008157052A
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fan
diode
temperature
control circuit
cooled
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JP2006344154A
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Japanese (ja)
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Katsuji Asano
勝司 浅野
Koichi Sakida
浩一 崎田
Shigeki Nakajima
茂樹 中嶋
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TDK Lambda Corp
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TDK Lambda Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan speed control circuit controlling a fan speed according to temperature with a simple constitution. <P>SOLUTION: In the figure, a fan 1 is connected to a DC power supply 3 through a diode 10. The fan 1 rotates at a speed responding to a fan voltage Vc supplied from the DC power supply 3 through the diode 10. The speed of the fan 1 is controlled according to the ambient temperature of a part to be cooled utilizing a forward voltage characteristic of the diode 10 against temperature. When the ambient temperature of the part to be cooled is low, the speed of the fan 1 is lowered and the noise from the fan 1 is inhibited, whereas when the ambient temperature of the part to be cooled is high, the speed of the fan 1 is raised and the part to be cooled is cooled to a certain constant temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、温度に応じてファンの回転数を制御するファン回転数制御回路に関する。   The present invention relates to a fan rotation speed control circuit that controls the rotation speed of a fan according to temperature.

電子機器等においては、内部の発熱素子等による温度上昇を抑制するために、機器内に冷却用のファンを設けることが一般的である。当該ファンが常に動作していると、冷却が不必要であるときにおいても大きな騒音が発生するという問題がある。この問題を解決する技術として、装置内の温度状況に応じてファンの動作電圧を制御しファンの回転数を制御するファン回転数制御回路が提案され、周知となっている。例えば、特許文献１では、被冷却装置の検出温度に応じて電源供給ラインに挿入された抵抗を切り替えることによりファンの動作電圧を段階的に制御している。   In an electronic device or the like, a cooling fan is generally provided in the device in order to suppress a temperature rise due to an internal heating element or the like. When the fan is always operating, there is a problem that a large noise is generated even when cooling is unnecessary. As a technique for solving this problem, a fan rotation speed control circuit for controlling the fan rotation speed and controlling the fan rotation speed in accordance with the temperature state in the apparatus has been proposed and is well known. For example, in Patent Document 1, the operating voltage of the fan is controlled step by step by switching the resistance inserted in the power supply line in accordance with the detected temperature of the apparatus to be cooled.

この種のファン回転数制御回路の従来例を図４に示す。同図において、１はファンであり、トランジスタ２を介して直流電源３へ接続されている。ファン１は、トランジスタ２を通じて直流電源３から供給されるファン電圧Ｖｃに応じた回転数で回転する。トランジスタ２のベースには制御回路４が接続されており、制御回路４から出力される制御信号によりトランジスタ２のコレクタ−エミッタ間電流が制御される。制御回路４には、例えばサーミスタ，ポジスタなどの温度検出素子５が接続され、その温度検出信号が入力される。   A conventional example of this type of fan speed control circuit is shown in FIG. In the figure, reference numeral 1 denotes a fan, which is connected to a DC power source 3 through a transistor 2. The fan 1 rotates at a rotation speed corresponding to the fan voltage Vc supplied from the DC power supply 3 through the transistor 2. A control circuit 4 is connected to the base of the transistor 2, and a collector-emitter current of the transistor 2 is controlled by a control signal output from the control circuit 4. For example, a temperature detection element 5 such as a thermistor or a posistor is connected to the control circuit 4, and the temperature detection signal is input.

このような電圧制御回路では、温度検出素子５の周囲温度に応じて制御回路４がトランジスタ２を制御することで、直流電源３からファン１へ供給されるファン電圧Ｖｃが制御され、ファン１の回転数制御が行なわれる。
特開平１１−２５１７７６号公報 In such a voltage control circuit, the control circuit 4 controls the transistor 2 in accordance with the ambient temperature of the temperature detection element 5, thereby controlling the fan voltage Vc supplied from the DC power supply 3 to the fan 1. Rotational speed control is performed.
Japanese Patent Laid-Open No. 11-251776

上記従来のファン回転数制御回路は、被冷却部品の周囲温度を温度検出素子５にて検出し、当該検出結果に応じて、複雑な制御回路４にて、ファン電圧Ｖｃを制御していた。従って、回路構成が複雑であり、その部品点数が多いものとなっていた。これに伴い、当該従来のファン回転数制御回路は、高価であり、また実装スペースも多く必要としていた。   The conventional fan rotation speed control circuit detects the ambient temperature of the component to be cooled by the temperature detection element 5 and controls the fan voltage Vc by the complicated control circuit 4 according to the detection result. Therefore, the circuit configuration is complicated and the number of parts is large. Accordingly, the conventional fan rotation speed control circuit is expensive and requires a lot of mounting space.

そこで本発明は上記問題点に鑑み、簡単な構成で温度に応じてファンの回転数を制御することが可能なファン回転数制御回路を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide a fan rotation speed control circuit capable of controlling the rotation speed of a fan according to temperature with a simple configuration.

本発明における請求項１では、電源から供給される電圧に応じた回転数で回転するファンを制御するファン回転数制御回路において、前記ファンに供給される電源ラインにダイオードを設けている。   According to a first aspect of the present invention, in a fan rotation speed control circuit that controls a fan that rotates at a rotation speed corresponding to a voltage supplied from a power supply, a diode is provided in a power supply line supplied to the fan.

このようにすると、ダイオードの温度特性によりファンに供給される電圧が温度に応じて自動的に調整されるため、温度に応じた最適なファンの回転数制御を行うことができる。   In this way, the voltage supplied to the fan is automatically adjusted according to the temperature according to the temperature characteristics of the diode, so that it is possible to perform optimum fan speed control according to the temperature.

本発明における請求項２のファン回転数制御回路では、前記ダイオードを被冷却部品の近傍に配置している。   In the fan rotation speed control circuit according to the second aspect of the present invention, the diode is disposed in the vicinity of the component to be cooled.

このようにすると、周囲温度に関係なく、被冷却部品の温度に応じて最適なファンの回転数制御を行うことができる。   If it does in this way, regardless of ambient temperature, optimal rotation speed control of a fan can be performed according to the temperature of to-be-cooled components.

本発明の請求項１によると、簡単な回路で安価にでき、実装スペースも必要とせず、ファンからの騒音も最適に抑えることができる。また、ファンの寿命を延ばすことができる。   According to the first aspect of the present invention, the cost can be reduced with a simple circuit, the mounting space is not required, and the noise from the fan can be suppressed optimally. In addition, the life of the fan can be extended.

本発明の請求項２によると、被冷却部品に対して最適な冷却を行うことができる。   According to the second aspect of the present invention, it is possible to optimally cool the component to be cooled.

以下、添付図面を参照しながら、本発明におけるファン回転数制御回路の好ましい実施例を説明する。なお、従来例と同一箇所には同一符号を付し、共通する部分の説明は重複するため極力省略する。   Hereinafter, preferred embodiments of a fan rotation speed control circuit according to the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same location as a prior art example, and since description of a common part overlaps, it abbreviate | omits as much as possible.

図１は、本発明の一実施例におけるファン回転数制御回路の回路図である。同図において、１はファンであり、ダイオード10を介して直流電源３へ接続されている。ファン１は、ダイオード10を通じて直流電源３から供給されるファン電圧Ｖｃに応じた回転数で回転する。ダイオード10は、ｎ個（ｎは任意の整数）のダイオード101〜10nを直列接続してなり、各ダイオードのアノードが直流電源３側、各ダイオードのカソードがファン１側となるよう向きを揃えて直列接続されている。本実施例においては、電源ライン（接地ラインも含む）の上側にダイオード10を挿入しているが、電源ラインの下側に挿入した場合にも同じ効果を奏することは言うまでもない。 FIG. 1 is a circuit diagram of a fan rotation speed control circuit according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a fan, which is connected to a DC power source 3 via a diode 10. The fan 1 rotates at a rotational speed corresponding to the fan voltage Vc supplied from the DC power supply 3 through the diode 10. The diode 10 has n (n is an arbitrary integer) diodes 10 1 to 10 n connected in series, and is oriented so that the anode of each diode is on the DC power supply 3 side and the cathode of each diode is on the fan 1 side. They are aligned and connected in series. In the present embodiment, the diode 10 is inserted above the power supply line (including the ground line), but it goes without saying that the same effect can be obtained when it is inserted below the power supply line.

本実施例では、装置内部にダイオード10を備え、そのダイオード10の温度に対する順電圧の特性を利用し、被冷却部品の周囲温度（装置の内部温度）に応じて、ファン１の回転数を制御する。被冷却部品の周囲温度（装置の内部温度）が低い場合（装置の損失が少ない場合、あるいは、装置の周囲温度が低い場合）は、ファン１の回転数を下げ、ファン１からの騒音を抑える一方、被冷却部品の周囲温度が高い場合は、ファン１の回転数を上げ、被冷却部品をある一定の温度に冷却する。   In this embodiment, a diode 10 is provided inside the device, and the number of revolutions of the fan 1 is controlled according to the ambient temperature of the part to be cooled (internal temperature of the device) using the characteristics of the forward voltage with respect to the temperature of the diode 10. To do. When the ambient temperature of the component to be cooled (internal temperature of the device) is low (when the loss of the device is small or when the ambient temperature of the device is low), the number of revolutions of the fan 1 is lowered and the noise from the fan 1 is suppressed. On the other hand, when the ambient temperature of the component to be cooled is high, the number of rotations of the fan 1 is increased to cool the component to be cooled to a certain temperature.

図２にダイオードの周囲温度に対する順電圧特性を示す。同図から、周囲温度が上がるに従い、ダイオードの順電圧が下がることが分かる。また、ダイオード10を構成するダイオード数ｎが多いほど、順電圧の変化幅（低温時における降下率）が大きくなっていることが分かる。この特性を利用することで、図１に示した回路におけるファン電圧Ｖｃの特性は、図３の通りになる。ダイオード10の周囲温度が上がるに従い、ファン電圧Ｖｃ（ファンの回転数）もこれに比例して上昇する。すなわち、ダイオード10の順電圧が温度上昇に応じて低下した分、直流電源３からファン１に供給される電圧に対する電圧降下が抑制され、ファン電圧Ｖｃが増加するためである。   FIG. 2 shows the forward voltage characteristics with respect to the ambient temperature of the diode. From the figure, it can be seen that the forward voltage of the diode decreases as the ambient temperature increases. It can also be seen that the larger the number n of diodes constituting the diode 10, the greater the forward voltage change width (lowering rate at low temperature). By utilizing this characteristic, the characteristic of the fan voltage Vc in the circuit shown in FIG. 1 becomes as shown in FIG. As the ambient temperature of the diode 10 increases, the fan voltage Vc (fan rotation speed) also increases in proportion thereto. That is, the voltage drop with respect to the voltage supplied from the DC power supply 3 to the fan 1 is suppressed and the fan voltage Vc increases as the forward voltage of the diode 10 decreases as the temperature increases.

ファン１は、ファン電圧Ｖｃに応じて回転数が変化するため、ダイオード10の温度が低いうちは、ファン電圧Ｖｃひいてはファンの回転数が低いが、ダイオード10の温度が高くなるに従って、ファン電圧Ｖｃひいてはファンの回転数が漸次上昇する。当該作用は、図３に示すように、ダイオード10を構成するダイオード数ｎが多くなればなるほど顕著なものとなる。   Since the rotation speed of the fan 1 changes according to the fan voltage Vc, the fan voltage Vc and thus the fan rotation speed is low while the temperature of the diode 10 is low, but the fan voltage Vc increases as the temperature of the diode 10 increases. As a result, the rotational speed of the fan gradually increases. As shown in FIG. 3, the effect becomes more remarkable as the number n of diodes constituting the diode 10 increases.

このようにして、ファン１の電源ラインにダイオード10を追加するという簡単な回路変更で、装置の内部温度に応じた最適な冷却（ファンの回転数制御）を行うことができる。このとき、ファン回転数を温度により可変するにあたり、ファン１の電圧制御を負の特性を持つダイオード10のみで行うため、部品の追加が最小であり、簡単な回路で安価にできる。従って、コスト上昇もわずかである。また、部品点数が少ないため、実装スペースも必要とせず、ファン１内部への追加が可能である。さらに、最適なファン１の回転数にすることで、被冷却部品の冷却が必要でない時はファン１の回転音が軽減されるため、ファン１からの騒音も最適に抑えることができる。これに伴い、ファン１の回転数が最適化され、ファンの寿命を延ばすことができる。   In this way, by a simple circuit change in which the diode 10 is added to the power supply line of the fan 1, optimal cooling (fan rotation speed control) according to the internal temperature of the apparatus can be performed. At this time, since the voltage control of the fan 1 is performed only by the diode 10 having a negative characteristic when the fan rotation speed is varied depending on the temperature, the addition of parts is minimal, and the cost can be reduced with a simple circuit. Therefore, the cost increase is slight. Further, since the number of parts is small, a mounting space is not required, and the fan 1 can be added inside. Furthermore, by setting the optimal number of rotations of the fan 1, since the rotation sound of the fan 1 is reduced when cooling of the component to be cooled is not necessary, the noise from the fan 1 can be suppressed optimally. Accordingly, the rotational speed of the fan 1 is optimized, and the life of the fan can be extended.

以上のように本実施例では、直流電源３から供給されるファン電圧Ｖｃに応じた回転数で回転するファン１を制御するファン回転数制御回路において、ファン１に供給される電源ラインにダイオード10を設けている。   As described above, in this embodiment, in the fan rotational speed control circuit that controls the fan 1 that rotates at the rotational speed corresponding to the fan voltage Vc supplied from the DC power supply 3, the diode 10 is connected to the power supply line supplied to the fan 1. Is provided.

このようにすると、ダイオード10の温度特性によりファン１に供給されるファン電圧Ｖｃが温度に応じて自動的に調整されるため、温度に応じた最適なファン１の回転数制御を行うことができる。従って、簡単な回路で安価にでき、実装スペースも必要とせず、ファン１からの騒音も最適に抑えることができる。また、ファン１の寿命を延ばすことができる。   In this way, the fan voltage Vc supplied to the fan 1 is automatically adjusted according to the temperature according to the temperature characteristics of the diode 10, so that the optimum rotational speed control of the fan 1 according to the temperature can be performed. . Therefore, the cost can be reduced with a simple circuit, the mounting space is not required, and the noise from the fan 1 can be optimally suppressed. Moreover, the lifetime of the fan 1 can be extended.

また本実施例のファン回転数制御回路では、ダイオード10を被冷却部品の近傍に配置している。   Further, in the fan rotation speed control circuit of this embodiment, the diode 10 is arranged in the vicinity of the component to be cooled.

このようにすると、周囲温度に関係なく、被冷却部品の温度に応じて最適なファン１の回転数制御を行うことができる。従って、被冷却部品に対して最適な冷却を行うことができる。   If it does in this way, regardless of ambient temperature, optimal rotation speed control of the fan 1 can be performed according to the temperature of to-be-cooled components. Therefore, optimal cooling can be performed on the component to be cooled.

なお、本発明は、上記実施例に限定されるものではなく、本発明の趣旨を逸脱しない範囲で変更可能である。ファンの用途も特に限定されず、例えばスイッチング電源装置，ＵＰＳ装置（無停電電源装置）など、放熱にファンを使用している装置にも応用可能である。   In addition, this invention is not limited to the said Example, It can change in the range which does not deviate from the meaning of this invention. The use of the fan is not particularly limited, and can be applied to a device using a fan for heat dissipation, such as a switching power supply device and a UPS device (uninterruptible power supply device).

本発明の一実施例におけるファン回転数制御回路の回路図である。It is a circuit diagram of the fan rotation speed control circuit in one Example of this invention. ダイオードの周囲温度に対する順電圧特性を示す特性図である。It is a characteristic view which shows the forward voltage characteristic with respect to the ambient temperature of a diode. 図１のファン回転数制御回路を構成するダイオード数に応じて変化するファン電圧特性を示す特性図である。It is a characteristic view which shows the fan voltage characteristic which changes according to the diode number which comprises the fan rotation speed control circuit of FIG. 従来例におけるファン回転数制御回路の回路図である。It is a circuit diagram of the fan rotation speed control circuit in the conventional example.

符号の説明Explanation of symbols

１ ファン
３ 直流電源
10 ダイオード
1 Fan 3 DC power supply
10 Diode

Claims (2)

電源から供給される電圧に応じた回転数で回転するファンを制御するファン回転数制御回路において、前記ファンに供給される電源ラインにダイオードを設けたことを特徴とするファン回転数制御回路。 A fan rotation speed control circuit for controlling a fan rotating at a rotation speed corresponding to a voltage supplied from a power supply, wherein a diode is provided in a power supply line supplied to the fan. 前記ダイオードを被冷却部品の近傍に配置したことを特徴とする請求項１記載のファン回転数制御回路。
2. The fan rotation speed control circuit according to claim 1, wherein the diode is arranged in the vicinity of a component to be cooled.
JP2006344154A 2006-12-21 2006-12-21 Fan speed control circuit Pending JP2008157052A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109708265A (en) * 2018-12-20 2019-05-03 海信（山东）空调有限公司 The starting method and outdoor unit of blower in a kind of outdoor unit

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JPH04340757A (en) * 1991-05-17 1992-11-27 Fujitsu Ltd Temperature detecting system for electronic device
JPH0540533A (en) * 1991-08-06 1993-02-19 Fujitsu Ltd Temperature detection system for electronic device
JPH07177790A (en) * 1993-12-20 1995-07-14 Asmo Co Ltd Motor controller
JPH07322603A (en) * 1994-05-26 1995-12-08 Fujitsu Ltd Power supply device
JPH1184957A (en) * 1997-09-02 1999-03-30 Canon Inc Image reader

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Publication number Priority date Publication date Assignee Title
JPS49133110A (en) * 1973-04-19 1974-12-20
JPS628724A (en) * 1985-07-03 1987-01-16 松下電器産業株式会社 Charge type cleaner
JPH04340757A (en) * 1991-05-17 1992-11-27 Fujitsu Ltd Temperature detecting system for electronic device
JPH0540533A (en) * 1991-08-06 1993-02-19 Fujitsu Ltd Temperature detection system for electronic device
JPH07177790A (en) * 1993-12-20 1995-07-14 Asmo Co Ltd Motor controller
JPH07322603A (en) * 1994-05-26 1995-12-08 Fujitsu Ltd Power supply device
JPH1184957A (en) * 1997-09-02 1999-03-30 Canon Inc Image reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109708265A (en) * 2018-12-20 2019-05-03 海信（山东）空调有限公司 The starting method and outdoor unit of blower in a kind of outdoor unit

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