JPH10178794A - Fan motor drive circuit - Google Patents
Fan motor drive circuitInfo
- Publication number
- JPH10178794A JPH10178794A JP8353659A JP35365996A JPH10178794A JP H10178794 A JPH10178794 A JP H10178794A JP 8353659 A JP8353659 A JP 8353659A JP 35365996 A JP35365996 A JP 35365996A JP H10178794 A JPH10178794 A JP H10178794A
- Authority
- JP
- Japan
- Prior art keywords
- hall element
- fan motor
- drive circuit
- resistor
- motor drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007796 conventional method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ホール素子によっ
てロータの位置を検知することによりコイルに流す電流
極性を切り換えてファンモータを駆動する回路に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for driving a fan motor by switching the polarity of a current flowing through a coil by detecting the position of a rotor with a Hall element.
【０００２】[0002]
【従来の技術】近年、パソコンの性能が急速に向上して
おり、それに伴いＣＰＵなど各電子部品が放出する熱量
も増大し、冷却用ファンモータはディスクトップ型パソ
コンは勿論、ノート型パソコンも欠かせないものになっ
てきている。上記パソコンなどに使用されるブラシレス
ファンモータの一つに、磁気センサ（ホール素子）で磁
極の方向を検知することにより駆動電流の極性切り換え
を行うものがある。2. Description of the Related Art In recent years, the performance of personal computers has been rapidly improving, and the amount of heat emitted from each electronic component such as a CPU has also increased. Accordingly, not only desktop personal computers but also notebook personal computers have been required for cooling fan motors. It is becoming something that can not be done. As one of brushless fan motors used in the personal computer and the like, there is one that switches the polarity of a drive current by detecting the direction of a magnetic pole with a magnetic sensor (Hall element).
【０００３】図４は、上記タイプのファンモータを使用
した駆動回路の一例を示すブロック図である。ホール素
子１４の電源接続端子はホール素子１４を保護する電流
制御抵抗（Ｒ1 ）１２を介してダイオード１１のカソー
ドに接続されている。カソード１１のアノードはＤＣ電
源に接続されている。ホール素子１４の出力端子はアン
プ１７，１８の一方の入力端子に接続されている。アン
プ１７，１８の他方の入力端子は抵抗１５を介して充電
されるコンデンサ１６の出力端子に接続されている。FIG. 4 is a block diagram showing an example of a drive circuit using a fan motor of the type described above. The power supply connection terminal of the Hall element 14 is connected to the cathode of the diode 11 via a current control resistor (R 1 ) 12 for protecting the Hall element 14. The anode of the cathode 11 is connected to a DC power supply. The output terminal of the Hall element 14 is connected to one input terminal of the amplifiers 17 and 18. The other input terminals of the amplifiers 17 and 18 are connected via a resistor 15 to the output terminal of a capacitor 16 charged.
【０００４】ホール素子１４の出力端子間からは、
磁界極性に応じた交流電圧が出力され、ホール素子１４
のの出力電圧がの出力電圧より大きくなった瞬間に
は、アンプ１７の出力はアンプ１８の出力より大きくな
るためコイル１９には矢印２０に示す方向に電流が流れ
る。磁界極性が反転してホール素子１４の間の出力
が反転すると、アンプ１８の出力はアンプ１７の出力よ
り大きくなってコイル１９には矢印２１に示すように反
転電流が流れる。[0004] From between the output terminals of the Hall element 14,
An AC voltage corresponding to the magnetic field polarity is output, and the Hall element 14
At the moment when the output voltage becomes larger than the output voltage, the output of the amplifier 17 becomes larger than the output of the amplifier 18, so that the current flows through the coil 19 in the direction shown by the arrow 20. When the polarity of the magnetic field is reversed and the output between the Hall elements 14 is reversed, the output of the amplifier 18 is larger than the output of the amplifier 17 and a reversed current flows through the coil 19 as shown by an arrow 21.
【０００５】上記従来のファンモータ駆動回路は、温度
変化に対する動作の安定を図るために飽和型バイポーラ
回路を用いていた。この飽和動作では、駆動信号が飽和
値となって大きくレベルをとることができるとともに駆
動信号レベルに対し温度変化の影響が生じにくくなる。
なお、ホール素子を非飽和（正弦波に近づける）動作で
用いる場合には、図３の特性図から明らかなように高温
時にホール素子の感度が低下しホール出力電圧が小さく
なって回転数が少なくなるという問題が生じる。The above-described conventional fan motor drive circuit uses a saturated bipolar circuit in order to stabilize the operation with respect to a temperature change. In this saturation operation, the drive signal becomes a saturated value and can take a large level, and the drive signal level is less likely to be affected by a temperature change.
When the Hall element is used in an unsaturated operation (approaching a sine wave), the sensitivity of the Hall element decreases at high temperatures, the Hall output voltage decreases, and the rotation speed decreases, as is clear from the characteristic diagram of FIG. Problem arises.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上記ファン
モータを内蔵させたパソコンなどのファンモータによる
騒音をさらに抑制したいという要請がある。上記ファン
モータを内蔵させたノート型パソコンにおいて、絶対的
な騒音レベル値からすると僅かな騒音ではあるが、この
騒音が静かな環境下でパソコンを操作する場合には、気
になりやすいというものである。そこで本件発明者は、
このような騒音の原因を追求した。その結果、ファンモ
ータ駆動回路の極性切り換えを飽和動作で行っているた
め、駆動信号の反転が急激に行われ、この駆動信号の急
激な反転がロータに対し振動を与えている点を突き止め
た。By the way, there is a demand for further suppressing noise caused by a fan motor such as a personal computer having the above-described fan motor built therein. In a notebook computer with a built-in fan motor, the noise level is a little noise in terms of absolute noise level. However, when operating the computer in a quiet environment, this noise is easily noticeable. is there. Therefore, the present inventor
We pursued the cause of such noise. As a result, since the switching of the polarity of the fan motor drive circuit is performed by the saturation operation, the inversion of the drive signal is rapidly performed, and it is found that the sudden inversion of the drive signal gives vibration to the rotor.
【０００７】この振動はファンモータ単体での運転で
は、全く認識できない振動ではあったが、パソコン筐体
の取り付け位置によっては、この僅かな振動が増幅され
騒音として比較的大きな音になる場合がある。本発明の
課題は、ホール素子によってロータの回転位置を検知す
ることによりコイルに流れる電流極性を切り換える、ブ
ラシレスファンモータの駆動回路において、温度変化の
影響を受けることなく、運転時の駆動回路の出力に起因
する振動を抑え、ファンモータを取り付けた筐体等にこ
の振動による影響、例えば筐体自体が騒音を出すことが
ないようにしたファンモータ駆動回路を提供することに
ある。This vibration cannot be recognized at all by the operation of the fan motor alone. However, depending on the mounting position of the personal computer housing, this slight vibration may be amplified and become relatively loud as noise. . An object of the present invention is to provide a drive circuit for a brushless fan motor that switches the polarity of a current flowing through a coil by detecting a rotational position of a rotor by a Hall element. An object of the present invention is to provide a fan motor drive circuit which suppresses the vibration caused by the above, and prevents the housing itself or the like to which the fan motor is attached from being affected by the vibration, for example, the housing itself from generating noise.
【０００８】[0008]
【課題を解決するための手段】前記課題を解決するため
に本発明によるファンモータ駆動回路は、ホール素子に
よってロータの位置を検知することによりコイルに流す
電流の極性を切り換えてファンモータを駆動する回路に
おいて、供給電源を電流制御抵抗を介して前記ホール素
子へ接続するとともに前記ホール素子に並列に電圧設定
用抵抗を接続し、前記電圧設定用抵抗は、ホール素子の
内部抵抗より小さくすることにより前記ホール素子を定
電圧駆動に近い状態で駆動するように構成してある。SUMMARY OF THE INVENTION In order to solve the above problems, a fan motor drive circuit according to the present invention drives a fan motor by switching the polarity of a current flowing through a coil by detecting the position of a rotor with a Hall element. In the circuit, a power supply is connected to the Hall element via a current control resistor and a voltage setting resistor is connected in parallel to the Hall element, and the voltage setting resistor is smaller than the internal resistance of the Hall element. The Hall element is configured to be driven in a state close to constant voltage driving.
【０００９】上記構成によれば、極性切り換え時の立ち
上がりに傾きが生じるとともに駆動信号レベルも十分大
きくとることができ、温度変化の影響を受けることな
く、電流極性が切り換ったときのロータに生じる振動を
緩和でき、ファンモータを取り付けたパソコン筐体等が
共鳴することにより増幅される騒音原因を取り除くこと
ができる。[0009] According to the above configuration, the rising at the time of polarity switching has a gradient and the drive signal level can be sufficiently large, and the rotor when the current polarity is switched without being affected by the temperature change. The generated vibration can be reduced, and the cause of noise amplified by resonance of the personal computer housing or the like to which the fan motor is attached can be eliminated.
【００１０】[0010]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を詳しく説明する。図１は、本発明によるファ
ンモータ駆動回路の実施の形態を示すブロック図であ
る。ダイオード１，電流制御抵抗（Ｒ1 ）２，ホール素
子４，アンプ７，８，抵抗５およびコンデンサ６は、図
４の対応する素子の機能と同じである。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a fan motor drive circuit according to the present invention. The diode 1, the current control resistor (R 1 ) 2, the Hall element 4, the amplifiers 7, 8, the resistor 5, and the capacitor 6 have the same functions as the corresponding elements in FIG.
【００１１】ホール素子４に並列に分割抵抗（Ｒ2 ）３
が接続されている。分割抵抗（Ｒ2）３はホール素子４
のインピーダンスに比較し、かなり小さい抵抗値が選ば
れる。例えば、ホール素子４のインピーダンスの１／５
〜１／１０等である。これは、ＲH （ホール素子のイン
ピーダンス）に対し抵抗値の小さい抵抗を選ぶことによ
り分割抵抗（Ｒ2 ）３に流れる電流分流比を高め、ＲH
（ホール素子のインピーダンス）の温度依存性を抑える
ためである。すなわち、温度変化の影響を小さくし、電
流制御抵抗（Ｒ1 ）２とホール素子４の接続点の電圧変
化を小さくして定電圧に近い状態で動作するようにして
ある。A dividing resistor (R 2 ) 3 is connected in parallel with the Hall element 4.
Is connected. The split resistor (R 2 ) 3 is a Hall element 4
A considerably smaller resistance value is selected as compared with the impedance of. For example, 1/5 of the impedance of the Hall element 4
１ ／ 1/10. This is because, by selecting a resistor having a small resistance value with respect to R H (impedance of the Hall element), the current shunt ratio flowing through the divided resistor (R 2 ) 3 is increased, and R H is increased.
This is to suppress the temperature dependency of (impedance of the Hall element). That is, the effect of the temperature change is reduced, and the voltage change at the connection point between the current control resistor (R 1 ) 2 and the Hall element 4 is reduced to operate in a state close to a constant voltage.
【００１２】また、電流制御抵抗（Ｒ1 ）２と分割抵抗
（Ｒ2 ）３の抵抗比は、Ｒ1 ＞＞Ｒ2 の関係にしてあ
る。例えばホール素子４のインピーダンスが２４０Ω〜
５００Ωのように変化することを想定した場合、具体的
数値例としてＲ1 ＝４３０Ω，Ｒ2 ＝５６Ωなどの抵抗
値が選ばれる。このときのＲ1 とＲ2 の抵抗比率は約
８：１である。この抵抗比率は磁極の特性やホール素子
に印加される電源電圧の大小によって適正な値が選択さ
れることになる。例えば３０：１（Ｒ1 ＝４３０Ω，Ｒ
2 ＝１５Ω）になる場合もある。The resistance ratio between the current control resistor (R 1 ) 2 and the split resistor (R 2 ) 3 has a relationship of R 1 >> R 2 . For example, the impedance of the Hall element 4 is 240Ω or more.
Assuming that the resistance changes like 500Ω, resistance values such as R 1 = 430Ω and R 2 = 56Ω are selected as specific numerical examples. At this time, the resistance ratio between R 1 and R 2 is about 8: 1. An appropriate value of the resistance ratio is selected depending on the characteristics of the magnetic pole and the magnitude of the power supply voltage applied to the Hall element. For example, 30: 1 (R 1 = 430Ω, R
2 = 15Ω).
【００１３】従来の駆動回路はホール素子を電流制御抵
抗（Ｒ1 ）により定電流に近い状態で駆動しているが、
本発明ではホール素子に並列に分割抵抗（Ｒ2 ）を追加
することにより定電圧駆動に近い状態で動作させてい
る。したがって、図３から明らかなように従来の駆動回
路は温度変化に対しホール素子出力電圧が大きく変化す
るが、本発明では温度変化に対しホール素子出力電圧の
変化は小さい。In the conventional drive circuit, the Hall element is driven by a current control resistor (R 1 ) in a state close to a constant current.
In the present invention, by adding a dividing resistor (R 2 ) in parallel to the Hall element, the Hall element is operated in a state close to constant voltage driving. Therefore, as is apparent from FIG. 3, in the conventional drive circuit, the output voltage of the Hall element greatly changes with a temperature change, but in the present invention, the output voltage of the Hall element changes little with the temperature change.
【００１４】図２は本発明によるファンモータ駆動回路
の出力波形を説明するための図である。（ａ）は飽和型
バイポーラ回路で駆動したときの駆動電流波形である。
（ｂ）は非飽和型バイポーラ回路で駆動したときの駆動
電流波形である。本発明による駆動回路の駆動電流の波
形は、（ｃ）に示すように駆動回路の出力が飽和状態と
不飽和状態の中間の特性になるようにホール素子に対し
電流制御抵抗（Ｒ1 ）と分割抵抗（Ｒ2 ）の値を設定し
ている。駆動電流の立ち上がり、立ち下がりに傾斜が生
じると同時に駆動出力レベルも飽和時と同じレベルとな
り、極性切り換わり時の衝撃が緩和される。以上の実施
の形態では、ホール素子のインピーダンスと分割抵抗の
具体的比率を１／５〜１／１０としているが、この比率
はＲ1 とＲ2 の比率の場合と同様、この範囲に限定され
るものではない。FIG. 2 is a diagram for explaining an output waveform of the fan motor drive circuit according to the present invention. (A) is a drive current waveform when driven by a saturated bipolar circuit.
(B) is a drive current waveform when driven by the unsaturated bipolar circuit. The waveform of the drive current of the drive circuit according to the invention, the output of the driver circuit as shown in (c) is a current control resistor to the Hall element so that the properties intermediate saturated and unsaturated state (R 1) The value of the division resistance (R 2 ) is set. At the same time as the rise and fall of the drive current, the drive output level becomes the same level as that at the time of saturation, and the shock at the time of polarity switching is reduced. In the above embodiment, although the specific ratio of the dividing resistors and the impedance of the Hall element 1 / 5-1 / 10, the ratio is similar to the case of the ratio of R 1 and R 2, it is limited to this range Not something.
【００１５】[0015]
【発明の効果】以上、説明したように本発明によれば、
ホール素子によってロータの位置を検知することにより
コイルに流れる電流極性を切り換えるブラシレス形式の
ファンモータの駆動回路において、温度変化の影響を受
けることなく、運転時の駆動回路の反転出力による振動
を少なくすることができ、例えばこのファンモータを取
り付けたパソコン筐体などの上記振動に起因する騒音を
抑えることができるという効果がある。As described above, according to the present invention,
In a brushless fan motor drive circuit that switches the polarity of a current flowing through a coil by detecting the position of a rotor with a Hall element, vibration due to the inverted output of the drive circuit during operation is reduced without being affected by temperature changes. For example, there is an effect that noise caused by the vibration of a personal computer housing or the like to which the fan motor is attached can be suppressed.
【図１】本発明によるファンモータ駆動回路の実施の形
態を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a fan motor drive circuit according to the present invention.
【図２】本発明によるファンモータ駆動回路の出力波形
を説明するための図である。FIG. 2 is a diagram for explaining an output waveform of a fan motor drive circuit according to the present invention.
【図３】ホール素子のホール出力電圧と周囲温度との関
係を示すグラフである。FIG. 3 is a graph showing a relationship between a Hall output voltage of a Hall element and an ambient temperature.
【図４】従来のファンモータ駆動回路の一例を示すブロ
ック図である。FIG. 4 is a block diagram showing an example of a conventional fan motor drive circuit.
１，１１…ダイオード ２，１２…電流制御抵抗 ３…分割抵抗 ４，１４…ホール素子 ５，１５…抵抗 ６，１６…コンデンサ ７，８，１７，１８…アンプ ９，１９…ファンモータのコイル 1,11 ... Diode 2,12 ... Current control resistor 3 ... Division resistor 4,14 ... Hall element 5,15 ... Resistance 6,16 ... Capacitor 7,8,17,18 ... Amplifier 9,19 ... Fan motor coil
Claims (1)
することによりコイルに流す電流極性を切り換えてファ
ンモータを駆動する回路において、 供給電源を電流制御抵抗を介して前記ホール素子へ接続
するとともに前記ホール素子に並列に電圧設定用抵抗を
接続し、 前記電圧設定用抵抗は、ホール素子の内部抵抗より小さ
くすることにより前記ホール素子を定電圧駆動に近い状
態で駆動するように構成したことを特徴とするファンモ
ータ駆動回路。1. A circuit for driving a fan motor by switching a polarity of a current flowing through a coil by detecting a position of a rotor by a Hall element, wherein a power supply is connected to the Hall element via a current control resistor and the Hall element is connected. A voltage setting resistor is connected in parallel to the element, and the voltage setting resistor is configured to be driven in a state close to constant voltage driving by making the Hall element smaller than the internal resistance of the Hall element. Fan motor drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35365996A JP3716064B2 (en) | 1996-12-17 | 1996-12-17 | Fan motor drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35365996A JP3716064B2 (en) | 1996-12-17 | 1996-12-17 | Fan motor drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10178794A true JPH10178794A (en) | 1998-06-30 |
| JP3716064B2 JP3716064B2 (en) | 2005-11-16 |
Family
ID=18432353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35365996A Expired - Fee Related JP3716064B2 (en) | 1996-12-17 | 1996-12-17 | Fan motor drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3716064B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007037386A (en) * | 2005-07-29 | 2007-02-08 | Sanyo Electric Co Ltd | Motor drive circuit |
| JP2007318966A (en) * | 2006-05-29 | 2007-12-06 | Sanyo Electric Co Ltd | Drive circuit of motor |
| JP2007318965A (en) * | 2006-05-29 | 2007-12-06 | Sanyo Electric Co Ltd | Drive circuit of motor |
| US10720871B2 (en) | 2017-10-30 | 2020-07-21 | Nidec Corporation | Driving circuit and motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806310A (en) * | 2010-03-11 | 2010-08-18 | 何振俊 | Temperature regulating control cabinet |
-
1996
- 1996-12-17 JP JP35365996A patent/JP3716064B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007037386A (en) * | 2005-07-29 | 2007-02-08 | Sanyo Electric Co Ltd | Motor drive circuit |
| JP2007318966A (en) * | 2006-05-29 | 2007-12-06 | Sanyo Electric Co Ltd | Drive circuit of motor |
| JP2007318965A (en) * | 2006-05-29 | 2007-12-06 | Sanyo Electric Co Ltd | Drive circuit of motor |
| US10720871B2 (en) | 2017-10-30 | 2020-07-21 | Nidec Corporation | Driving circuit and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3716064B2 (en) | 2005-11-16 |
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