JP3360438B2 - Centrifuge - Google Patents
CentrifugeInfo
- Publication number
- JP3360438B2 JP3360438B2 JP26560694A JP26560694A JP3360438B2 JP 3360438 B2 JP3360438 B2 JP 3360438B2 JP 26560694 A JP26560694 A JP 26560694A JP 26560694 A JP26560694 A JP 26560694A JP 3360438 B2 JP3360438 B2 JP 3360438B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- photocoupler
- centrifuge
- converter
- adjustment
- 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.)
- Expired - Fee Related
Links
Landscapes
- Centrifugal Separators (AREA)
- Control Of Voltage And Current In General (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、遠心機のように多種の
ロータ負荷を駆動するインバータの過電圧検出回路及び
調整方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter overvoltage detecting circuit for driving various types of rotor loads, such as a centrifuge, and an adjusting method.
【０００２】[0002]
【従来の技術】遠心機に使用される誘動機及びインバー
タに要求される機能としては、誘動機にのせたロータを
定格内で最短時間で加速・減速させることにある。特に
減速時間を短くするために制動方式を回生制動方式とし
ている。遠心機の負荷であるロータは多種類あり、それ
ぞれ許容回転数、慣性モーメントが違っている。そこで
許容回転数、慣性モーメントの小さいロータは回生され
たエネルギーを吸収できるが、高回転数、慣性モーメン
トの大きいロータは吸収しきれず、コンバータ部の電圧
を上昇させてしまう。この電圧が過大になるとインバー
タを破壊するため、コンバータ電圧を検知し、上昇分を
電源側に戻したり、抵抗で消費してコンバータの電圧を
抑えるようにしている。そこで遠心機のように多種の負
荷を最短時間で減速させるには、コンバータの電圧を精
度よく検出する必要が出てくる。2. Description of the Related Art A function required for an incentive and an inverter used in a centrifuge is to accelerate and decelerate a rotor mounted on the incentive within a shortest time within a rating. In particular, a regenerative braking system is used as the braking system to shorten the deceleration time. There are many types of rotors, which are loads of the centrifuge, and each has a different allowable rotation speed and different moment of inertia. Therefore, a rotor having a small allowable rotation speed and a small moment of inertia can absorb the regenerated energy, but a rotor having a high rotation speed and a large moment of inertia cannot completely absorb the energy, and the voltage of the converter section rises. If this voltage becomes excessive, the inverter is destroyed. Therefore, the converter voltage is detected and the rise is returned to the power supply side, or the voltage of the converter is suppressed by consuming the resistance. Therefore, in order to decelerate various types of loads in the shortest time like a centrifuge, it is necessary to accurately detect the voltage of the converter.
【０００３】従来の過電圧検出回路は図３に示すように
強電部と弱電部の絶縁の為にフォトカプラ２０を使用し
ている。フォトカプラのフォトダイオードの順電流はコ
ンバータの電圧により変化し、フォトトランジスタに伝
わり、コレクタ電圧の変化となってＣＰＵ２３のアナロ
グポートに入力される。A conventional overvoltage detection circuit uses a photocoupler 20 to insulate a high-current section from a low-current section as shown in FIG. The forward current of the photodiode of the photocoupler changes according to the voltage of the converter, is transmitted to the phototransistor, changes in the collector voltage, and is input to the analog port of the CPU 23.
【０００４】調整は実際のコンバータの電圧にし、調整
用ボリューム２１でコレクタ電圧を調整している。従来
の技術の問題点としては、 （１）調整を実際のコンバータ電圧で行なうので簡便に
するには定常時の電圧を利用することになる。しかし、
この検出回路の目的は過電圧時の検出であり、定常時電
圧の調整では誤差が生じる恐れがある。そこで、誤差を
最少にするには過電圧での調整になるが、実際に過電圧
を入力しなければならず、煩雑な調整となってしまう。The adjustment is made to the actual converter voltage, and the collector voltage is adjusted by the adjustment volume 21. The problems of the prior art are as follows: (1) Since the adjustment is performed with the actual converter voltage, the voltage at the steady state is used for simplicity. But,
The purpose of this detection circuit is to detect an overvoltage, and an error may occur in the adjustment of the steady-state voltage. In order to minimize the error, the adjustment must be performed with an overvoltage. However, the overvoltage must be actually input, which results in a complicated adjustment.
【０００５】（２）次にフォトカプラの変換効率の経年
変化の問題がある。フォトカプラは経年変化で変換効率
が悪くなってしまう。調整時には誤差なしにできても次
第に誤差が増してしまう。遠心機のように製品寿命が５
年〜１０年と長いと経年変化は無視できなくなってく
る。(2) Next, there is a problem that the conversion efficiency of the photocoupler changes over time. The conversion efficiency of a photocoupler deteriorates with aging. Even if the adjustment can be performed without error, the error gradually increases. Product life is 5 like a centrifuge
If it is as long as 10 to 10 years, the secular change cannot be ignored.
【０００６】[0006]
【発明が解決しようとする課題】従来の技術には、上述
した調整の煩雑さ及び経年変化による誤差の増大という
問題があった。The prior art has the problems of the above-mentioned complicated adjustment and an increase in errors due to aging.
【０００７】本発明の目的は、過電圧検出回路の調整を
自動化すると共に経年変化による誤差をなくすことであ
る。It is an object of the present invention to automate the adjustment of an overvoltage detection circuit and eliminate errors due to aging.
【０００８】[0008]
【課題を解決するための手段】上記目的は、コンバータ
部の過電圧検出回路から調整用ボリュームをなくし、遠
心機を制御するＣＰＵのイニシャル動作時に調整用リレ
ーをオンにしてコンバータの過電圧に相当する基準電圧
をツェナーダイオードで発生させ、フォトカプラによっ
て絶縁したコレクタ電圧のＡ／Ｄ値をＣＰＵが自動調整
することで達成される。SUMMARY OF THE INVENTION It is an object of the present invention to eliminate a control volume from an overvoltage detection circuit of a converter section and to turn on an adjustment relay at the time of an initial operation of a CPU for controlling a centrifuge to set a reference corresponding to an overvoltage of the converter. This is achieved by generating a voltage with a zener diode and automatically adjusting the A / D value of the collector voltage isolated by a photocoupler by a CPU.
【０００９】[0009]
【作用】上記のように構成されたコンバータの過電圧検
出回路を持つ遠心機は、電源が入り、遠心機制御用ＣＰ
Ｕがイニシャル動作をする毎に自動調整を行ない、フォ
トカプラが経年変化で変換効率が下った誤差分も含めて
調整するようになるので経年変化の影響を受けないよう
に動作する。The centrifuge having the overvoltage detection circuit of the converter configured as described above is powered on and has a centrifuge control CP.
Automatic adjustment is performed every time U performs the initial operation, and the photocoupler adjusts the error including the conversion efficiency lowered due to aging, so that the operation is performed without being affected by aging.
【００１０】[0010]
【実施例】図１はコンバータ部の過電圧検出回路の１実
施例を示している。この回路の入力電圧はコンバータ部
の電圧（ＤＣ ＶＯＬＴ）である。出力電圧はフォトカ
プラ１、内部のフォトトランジスタのコレクタ電圧であ
る。この電圧はＣＰＵ１１のアナログポート端子に入力
される。FIG. 1 shows an embodiment of an overvoltage detection circuit of a converter section. The input voltage of this circuit is the voltage of the converter section (DC VOLT). The output voltage is the collector voltage of the photocoupler 1 and the internal phototransistor. This voltage is input to the analog port terminal of the CPU 11.
【００１１】コンバータの電圧は定常時、ＤＣ２８０Ｖ
になっている。コンバータ電圧は、抵抗２と抵抗３で分
圧する。分圧によりコンバータ電圧を１／１００にす
る。そこでコンバータ電圧がＤＣ２８０Ｖの時、入力電
圧Ｖｉは２．８Ｖとなる。When the voltage of the converter is in a steady state, DC 280V
It has become. The converter voltage is divided by the resistors 2 and 3. The converter voltage is reduced to 1/100 by the voltage division. Therefore, when the converter voltage is DC280V, the input voltage Vi becomes 2.8V.
【００１２】回生制動時のコンバータ電圧の許容電圧を
ＤＣ４５０Ｖとする時、Ｖｉは４．５Ｖになるのでツェ
ナーダイオード４の基準電圧は許容電圧より少し高いＤ
Ｃ５００Ｖに相当する５．０Ｖとする。Ｖｉはバッファ
ー回路５に入力する。バッファー回路はＶｉが後段の検
出回路のインピーダンスの影響を受けないようにすると
ともに、フォトダイオードに適切な順電流を流す電源の
役割をしている。次段の定電流回路でフォトダイオード
の順電流を安定にさせている。When the allowable voltage of the converter voltage at the time of regenerative braking is DC 450 V, Vi becomes 4.5 V, so that the reference voltage of the Zener diode 4 is slightly higher than the allowable voltage.
5.0V, which is equivalent to C500V. Vi is input to the buffer circuit 5. The buffer circuit serves to prevent Vi from being affected by the impedance of the subsequent detection circuit, and also serves as a power supply for supplying an appropriate forward current to the photodiode. The forward current of the photodiode is stabilized by the constant current circuit of the next stage.
【００１３】遠心機の制御部のＣＰＵはインバータの制
御の他に温度制御、操作パネルの制御等を行なってい
る。遠心機の電源がオンされると制御部のＣＰＵは、こ
れらの制御を始める前にＣＰＵのポートや周辺ＩＣの初
期化（イニシャル動作）を行なう。このイニシャル動作
の途中でＣＰＵはリレー７をオンにする。するとツェー
ダイオード４と抵抗８により、Ｖｉは基準電圧５．０Ｖ
となる。ＣＰＵ１１はアナログポートから入力した電圧
をＡ／Ｄ変換し、そのＡ／Ｄ値をコンバータ部の電圧
が、ＤＣ５００Ｖの時の電圧として認識し、自動調整す
る。これで調整が完了し、ＣＰＵはリレー７をオフす
る。The CPU of the control unit of the centrifuge performs temperature control, operation panel control, and the like in addition to inverter control. When the power of the centrifuge is turned on, the CPU of the control unit initializes the ports of the CPU and peripheral ICs (initial operation) before starting these controls. During this initial operation, the CPU turns on the relay 7. Then, the reference voltage 5.0 V is set by the Zener diode 4 and the resistor 8.
Becomes The CPU 11 performs A / D conversion on the voltage input from the analog port, recognizes the A / D value as a voltage when the voltage of the converter unit is DC 500 V, and automatically adjusts the value. This completes the adjustment, and the CPU turns off the relay 7.
【００１４】以後、ツェナーダイオード４は５Ｖ以上の
過電圧防止素子として働く。Thereafter, the Zener diode 4 functions as an overvoltage prevention element of 5 V or more.
【００１５】もちろん、ＣＰＵはＶｉが４．５Ｖを越え
ないように図２のトランジスタ１３をスイッチングす
る。Of course, the CPU switches the transistor 13 of FIG. 2 so that Vi does not exceed 4.5V.
【００１６】[0016]
【発明の効果】本発明によれば、過電圧検出回路の調整
を自動化できるので、調整用ボリュームを削除し調整を
なくすことができる。また遠心機の電源をオンする毎に
自動調整するのでフォトカプラの経年変化による誤差を
なくすことができる。According to the present invention, since the adjustment of the overvoltage detection circuit can be automated, the adjustment volume can be eliminated and the adjustment can be eliminated. In addition, the automatic adjustment is performed every time the power of the centrifuge is turned on, so that errors due to aging of the photocoupler can be eliminated.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明になる過電圧検出回路を示す回路図で
ある。FIG. 1 is a circuit diagram showing an overvoltage detection circuit according to the present invention.
【図２】 本発明になる電圧検出箇所となるコンバータ
部及びインバータ部の基本構成を示す回路図である。FIG. 2 is a circuit diagram showing a basic configuration of a converter unit and an inverter unit serving as voltage detection points according to the present invention.
【図３】 従来の検出回路図を示す回路図である。FIG. 3 is a circuit diagram showing a conventional detection circuit diagram.
１はフォトカプラ、２は抵抗、３は抵抗、４はツェナー
ダイオード、５はバッファー回路、６は定電流回路、７
はリレー、８は抵抗、９は抵抗、１０は抵抗、１１はＣ
ＰＵ、１２は交流電源、１３はパワートランジスタ、１
４は抵抗、１５は電解コンデンサ、１６はコンバータ
部、１７はインバータ部、１８はＡＣモータ、１９は抵
抗、２０はフォトカプラ、２１はボリューム、２２は抵
抗、２３はＣＰＵである。1 is a photocoupler, 2 is a resistor, 3 is a resistor, 4 is a Zener diode, 5 is a buffer circuit, 6 is a constant current circuit, 7
Is a relay, 8 is a resistor, 9 is a resistor, 10 is a resistor, 11 is C
PU, 12 is an AC power supply, 13 is a power transistor, 1
4 is a resistor, 15 is an electrolytic capacitor, 16 is a converter, 17 is an inverter, 18 is an AC motor, 19 is a resistor, 20 is a photocoupler, 21 is a volume, 22 is a resistor, and 23 is a CPU.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B04B 9/10 G05F 1/10 H02M 7/48 H02P 7/63 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B04B 9/10 G05F 1/10 H02M 7/48 H02P 7/63
Claims (3)
を駆動するインバータと、該インバータを制御するＣＰ
Ｕと、前記誘動機の回生制動時にコンバータ電圧をイン
バータ制御する前記ＣＰＵに入力するために絶縁するフ
ォトカプラとを備えた遠心機において、検出回路を調整
するための過電圧のしきい値に相当する基準電圧を発生
するツェナーダイオードと調整時の切換をするリレーを
設け、遠心機を制御する前記ＣＰＵのイニシャル動作時
に前記リレーの接点を基準電圧のツェナーダイオード側
に切換え、フォトカプラのコレクタ電圧をＡ／Ｄ値とし
て入力し、前記フォトカプラの経年変化を認識すること
で過電圧検出回路を自動調整させることを特徴とする遠
心機。And 1. A誘動machine for rotating the rotor, an inverter for driving the誘動machine, CP for controlling the inverter
And U, in centrifuge having a photocoupler for insulating in order to enter the converter voltage during regenerative braking of the誘動machine to the CPU for the inverter control, which corresponds to the threshold of the overvoltage for adjusting the detection circuit A zener diode for generating a reference voltage and a relay for switching at the time of adjustment are provided, and the contact of the relay is set to the zener diode side of the reference voltage during the initial operation of the CPU for controlling the centrifuge.
And set the collector voltage of the photocoupler to the A / D value.
To recognize the aging of the photocoupler
In the far characterized thereby automatically adjust the overvoltage detection circuit
Heart machine .
設けたことを特徴とする請求項１記載の遠心機。2. The centrifuge according to claim 1, wherein a constant current circuit is provided before the photocoupler.
容電圧値になるように調整することで、前記ツェナーダ
イオードが調整時には基準電圧となり、電圧検出時には
検出回路を保護することを特徴とする請求項１記載の遠
心機。3. The control circuit according to claim 2, wherein the reference voltage is adjusted to be an allowable voltage value of the converter voltage, so that the Zener diode becomes a reference voltage at the time of adjustment, and a detection circuit is protected at the time of voltage detection. 1 distant
Heart machine .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26560694A JP3360438B2 (en) | 1994-10-28 | 1994-10-28 | Centrifuge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26560694A JP3360438B2 (en) | 1994-10-28 | 1994-10-28 | Centrifuge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08126851A JPH08126851A (en) | 1996-05-21 |
| JP3360438B2 true JP3360438B2 (en) | 2002-12-24 |
Family
ID=17419474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26560694A Expired - Fee Related JP3360438B2 (en) | 1994-10-28 | 1994-10-28 | Centrifuge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3360438B2 (en) |
-
1994
- 1994-10-28 JP JP26560694A patent/JP3360438B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08126851A (en) | 1996-05-21 |
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