JP2521920B2 - AC motor drive power supply - Google Patents
AC motor drive power supplyInfo
- Publication number
- JP2521920B2 JP2521920B2 JP61193069A JP19306986A JP2521920B2 JP 2521920 B2 JP2521920 B2 JP 2521920B2 JP 61193069 A JP61193069 A JP 61193069A JP 19306986 A JP19306986 A JP 19306986A JP 2521920 B2 JP2521920 B2 JP 2521920B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- power supply
- detector
- side terminals
- 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 - Lifetime
Links
Landscapes
- Stopping Of Electric Motors (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、制動用回路が組込まれた電圧形インバー
タを用いて構成される交流電動機駆動用電源装置に関す
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for driving an AC electric motor configured by using a voltage source inverter having a braking circuit incorporated therein.
第２図は従来のこの種の電源装置を示したものであ
る。同図において、１は交流電源、２は交流を直流に変
換する順変換器、３は平滑用の電解コンデンサ、４は逆
変換器（トランジスタインバータ）であつて、可変周波
数の３相交流を交流電動機10に給電する。Trはトランジ
スタ、Ｄはフライホイルダイオードである。なお、２〜
４により電圧形インバータの主回路が構成されている。
５は制動用抵抗、６は制動用半導体スイッチ（トランジ
スタスイツチ）であつてベース駆動回路７からベース電
流IBを受けてONする。８は制動用の検出器（比較器）で
あつて、直流電圧検出器９の電圧検出信号Ｅを設定値E0
と比較して前者が後者より大になると検出信号Ｐをベー
ス駆動回路７に送出する。ベース駆動回路７はこの検出
信号を受けると上記ベース電流をトランジスタスイツチ
６に供給する。10はインバータ負荷である交流電動機
（３相誘導電動機）であつて、電圧形インバータにより
可変速駆動される。なお、逆変換器４の制御回路はその
図示を省略してある。FIG. 2 shows a conventional power supply device of this type. In the figure, 1 is an AC power supply, 2 is a forward converter for converting AC into DC, 3 is an electrolytic capacitor for smoothing, 4 is an inverse converter (transistor inverter), and three-phase AC of variable frequency is converted into AC. Power the electric motor 10. T r is a transistor and D is a flywheel diode. 2 to
4 constitutes the main circuit of the voltage type inverter.
Reference numeral 5 is a braking resistor, 6 is a braking semiconductor switch (transistor switch), which receives a base current I B from the base drive circuit 7 and turns on. Reference numeral 8 denotes a braking detector (comparator), which outputs a voltage detection signal E from the DC voltage detector 9 to a set value E 0.
When the former becomes larger than the latter as compared with, the detection signal P is sent to the base drive circuit 7. When the base drive circuit 7 receives this detection signal, it supplies the base current to the transistor switch 6. Reference numeral 10 is an AC motor (three-phase induction motor) which is an inverter load, and is driven at a variable speed by a voltage source inverter. The control circuit of the inverse converter 4 is not shown.
この構成においては、回生モードが開始され、インバ
ータの直流回路の電圧Ｅが上記設定値E0を越えるとトラ
ンジスタスイツチ６がONする。これにより制動用抵抗５
が電気的にインバータ主回路の直流回路に接続されるの
で、電解コンデンサ３の蓄積エネルギーが制動用抵抗５
を通して放電し該制動抵抗５により消費され、交流電動
機10に制動がかかることになる。In this configuration, when the regenerative mode is started and the voltage E of the DC circuit of the inverter exceeds the set value E 0 , the transistor switch 6 is turned on. As a result, the braking resistor 5
Is electrically connected to the DC circuit of the inverter main circuit, the stored energy of the electrolytic capacitor 3 is equal to the braking resistance 5
And is consumed by the braking resistor 5, and the AC motor 10 is braked.
この従来の発電制動回路では、直流回路の電圧Ｅが設
定値E0を越えると作動する構成となつているので、交流
電動機10とその機械的負荷が持つ回転エネルギーが大き
い場合には、回生エネルギーが大きいため電解コンデン
サ３の電圧上昇率が高くなる。Since this conventional dynamic braking circuit is configured to operate when the voltage E of the DC circuit exceeds the set value E 0 , when the rotational energy of the AC motor 10 and its mechanical load is large, the regenerative energy is large. Is large, the rate of increase in voltage of the electrolytic capacitor 3 is high.
このため、直流回路の回路電圧が過電圧レベルを越え
ると動作して電源遮断に至る直流過電圧保護回路を備え
たインバータに上記従来の制動用回路を付加した場合に
は、交流電動機10を急減速させようとした場合に、この
直流過電圧保護回路が働いてインバータガ停止してしま
う事態が起こるという問題があつた。For this reason, when the above conventional braking circuit is added to an inverter equipped with a DC overvoltage protection circuit that operates when the circuit voltage of the DC circuit exceeds the overvoltage level and shuts down the power supply, the AC motor 10 is rapidly decelerated. In such a case, there is a problem that the DC overvoltage protection circuit operates and the inverter stops.
この発明は上記した従来の問題を解消するためになさ
れたもので、直流過電圧護回路を有する場合にも、交流
電動機に確実に所望の急減速をかけることができ、従来
に比して信頼性を高めることがてきる交流電動駆動用電
源装置を得ることを目的とする。The present invention has been made to solve the above-mentioned conventional problems. Even when the DC overvoltage protection circuit is provided, it is possible to surely apply the desired rapid deceleration to the AC motor. It is an object of the present invention to obtain an AC electric drive power supply device capable of increasing the power consumption.
この発明は上記目的を達成するため、順変換器と逆変
換器、前記順変換器の直流側端子間に挿入された平滑用
コンデンサからなる電圧形インバータ主回路と、上記直
流側端子間に直列にして挿入された制動用抵抗と半導体
スイッチ、上記直流側端子間の電圧が導入され該電圧が
設定値を超えると信号を送出する検出器からなる制動回
路を有し、上記半導体スイッチの駆動回路が、上記検出
器の出力を受けて駆動信号を上記半導体スイッチに送出
する交流電動機駆動用電源装置において、 上記直流側端子間の電圧が上記設定値より高い過電圧
レベルを超えると上記インバータ主回路の動作を停止さ
せる直流過電圧保護回路を設ける場合において、 上記電圧が導かれる微分回路を有し、上記検出器が上
記電圧に上記微分回路の出力を同極性に重畳した電圧値
を上記設定値と比較する構成とした。In order to achieve the above object, the present invention provides a voltage converter main circuit comprising a forward converter, an inverse converter, a smoothing capacitor inserted between the DC terminals of the forward converter, and a series circuit between the DC terminals. And a semiconductor switch having a braking resistor inserted therein and a detector for transmitting a signal when a voltage between the DC side terminals is introduced and the voltage exceeds a set value, and a driving circuit for the semiconductor switch. However, in the AC motor drive power supply device that receives the output of the detector and sends a drive signal to the semiconductor switch, when the voltage between the DC side terminals exceeds an overvoltage level higher than the set value, the inverter main circuit When a DC overvoltage protection circuit that stops the operation is provided, it has a differentiating circuit to which the above voltage is introduced, and the above-mentioned detector superimposes the output of the differentiating circuit on the same polarity. The voltage value was configured to be compared with the set value.
この発明では、直流回路の電圧に該電圧の変化率を重
畳した電圧レベルを設定値と比較するので、設定値が、
見掛け上、上記変化率分だけ小さくなり、その分、半導
体スイッチの動作開始点が早まるので、急減速をかけて
も、直流回路の電圧が過電圧レベルに上昇する前に平滑
用コンデンサを抵抗を通して短絡することが可能とな
る。In the present invention, since the voltage level in which the rate of change of the voltage is superimposed on the voltage of the DC circuit is compared with the set value, the set value is
Apparently, the rate of change is reduced by the above change rate, and the operation start point of the semiconductor switch is accelerated accordingly. It becomes possible to do.
第１図はこの発明の一実施例を示したものであつて、
微分回路11、ダイオード12および加算部13を設けた点に
おいて、前記第２図の構成と相違する。微分回路11は直
流電圧検出器９の電圧検出信号Ｅが導かれ該電圧検出信
号を微分して出力する。この微分出力dE/dtはダイオー
ド12を通して加算部13に導かれる。加算部13は直流電圧
検出器９の電圧検出信号Ｅに上記微分出力dE/dtを重畳
する。検出器８は電圧（Ｅ＋dE/dt）を設定値E0と比較
する。他の構成は第２図のものと同じであるので、同一
符号を付して示してある。FIG. 1 shows an embodiment of the present invention.
2 in that a differentiating circuit 11, a diode 12 and an adding section 13 are provided. The differentiating circuit 11 receives the voltage detection signal E of the DC voltage detector 9 and differentiates the voltage detection signal to output it. This differential output dE / dt is guided to the adder 13 through the diode 12. The adder 13 superimposes the differential output dE / dt on the voltage detection signal E of the DC voltage detector 9. The detector 8 compares the voltage (E + dE / dt) with the set value E 0 . The other structure is the same as that of FIG. 2, and therefore is shown with the same reference numerals.
この構成においては、制御値EOと比較される電圧が、
上記（Ｅ＋dE/dt）であるので、上記設定値E0が、見掛
け上、レベル（dE/dt）だけ低くなる。従って、減速運
転開始時の電圧上昇率dE/dtが大きくても、直流回路の
電圧が過電圧レベルに上昇する前にトランジスタスイッ
チ６をONさせ制動作用を行わせることができる。In this configuration, the voltage compared to the control value E O is
Since it is (E + dE / dt), the set value E 0 apparently becomes lower by the level (dE / dt). Therefore, even if the voltage increase rate dE / dt at the start of deceleration operation is large, the transistor switch 6 can be turned on to perform the braking action before the voltage of the DC circuit rises to the overvoltage level.
なお、インバータが、電動機減速時の直流電圧の異常
上昇を抑制するためのオートランプ制御回路を有する場
合に、上記微分回路11の出力をダイオードを通して取り
出した信号を該オートランプ制御回路の入力信号として
利用すれば、上記実施例の場合と同様に直流回路の電圧
上昇に対する動作遅れを低減することができる。When the inverter has an auto-ramp control circuit for suppressing an abnormal rise in the DC voltage during deceleration of the motor, a signal obtained by extracting the output of the differentiating circuit 11 through a diode is used as the input signal of the auto-ramp control circuit. If used, the operation delay with respect to the voltage rise of the DC circuit can be reduced as in the case of the above embodiment.
この発明は以上説明した通り、制動開始を検出する検
出器では、インバータ直流回路の電圧と該電圧の微分値
との和を設定値と比較する構成としたことにより、従来
に比して制動回路の動作開始を早めることができるの
で、直流過電圧保護回路を動作させることなく、急減速
運転を行うことができ、従来に比して信頼性を大幅に高
めることができる。As described above, according to the present invention, the detector for detecting the start of braking is configured to compare the sum of the voltage of the inverter DC circuit and the differential value of the voltage with the set value. Since the start of the operation can be accelerated, the rapid deceleration operation can be performed without operating the DC overvoltage protection circuit, and the reliability can be significantly improved as compared with the conventional case.
第１図はこの発明の実施例を示すブロツク図、第２図は
従来の交流電動機駆動装置を示すブロツク図である。 ２……順変換器、３……電解コンデンサ、４……逆変換
器、５……制動用抵抗、６……半導体スイツチ、７……
ベース駆動回路、８……検出器、９……直流電圧検出
器、10……交流電動機、11……微分回路、12……ダイド
オート、13……加算部。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional AC motor drive device. 2 ... Forward converter, 3 ... Electrolytic capacitor, 4 ... Inverse converter, 5 ... Braking resistor, 6 ... Semiconductor switch, 7 ...
Base drive circuit, 8 ... Detector, 9 ... DC voltage detector, 10 ... AC motor, 11 ... Differentiating circuit, 12 ... Dide auto, 13 ... Addition section.
Claims (1)
側端子間に挿入された平滑用コンデンサからなる電圧形
インバータ主回路と、上記直流側端子間に直列にして挿
入された制動用抵抗と半導体スイッチ、上記直流側端子
間の電圧が導入され該電圧が設定値を超えると信号を送
出する検出器からなる制動回路を有し、上記半導体スイ
ッチの駆動回路が、上記検出器の出力を受けて駆動信号
を上記半導体スイッチに送出する交流電動機駆動用電源
装置において、 上記直流側端子間の電圧が上記設定値より高い過電圧レ
ベルを超えると上記インバータ主回路の動作を停止させ
る直流過電圧保護回路を設ける場合において、 上記電圧が導かれる微分回路を有し、上記検出器が上記
電圧に上記微分回路の出力を同極性に重畳した電圧値を
上記設定値と比較することを特徴とする交流電動機駆動
用電源装置。1. A voltage source inverter main circuit comprising a forward converter, an inverse converter, and a smoothing capacitor inserted between the DC side terminals of the forward converter, and a voltage source inverter main circuit inserted in series between the DC side terminals. The semiconductor device includes a braking resistor and a semiconductor switch, and a braking circuit including a detector that outputs a signal when a voltage between the DC side terminals is introduced and the voltage exceeds a set value. The semiconductor switch drive circuit includes the detector. In the power supply device for driving an AC motor which receives the output of the above and outputs a drive signal to the semiconductor switch, a DC for stopping the operation of the inverter main circuit when the voltage between the DC side terminals exceeds an overvoltage level higher than the set value. When an overvoltage protection circuit is provided, it has a differentiating circuit for guiding the voltage, and the detector sets the voltage value obtained by superimposing the output of the differentiating circuit on the voltage in the same polarity. Comparing the AC motor driving power supply apparatus according to claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61193069A JP2521920B2 (en) | 1986-08-19 | 1986-08-19 | AC motor drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61193069A JP2521920B2 (en) | 1986-08-19 | 1986-08-19 | AC motor drive power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6352680A JPS6352680A (en) | 1988-03-05 |
| JP2521920B2 true JP2521920B2 (en) | 1996-08-07 |
Family
ID=16301687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61193069A Expired - Lifetime JP2521920B2 (en) | 1986-08-19 | 1986-08-19 | AC motor drive power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2521920B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0447301U (en) * | 1990-08-29 | 1992-04-22 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6089794U (en) * | 1983-11-28 | 1985-06-19 | 株式会社東芝 | Voltage type inverter with power regeneration |
| JPS6166578A (en) * | 1984-09-06 | 1986-04-05 | Fanuc Ltd | Regenerative brake circuit of motor |
-
1986
- 1986-08-19 JP JP61193069A patent/JP2521920B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6352680A (en) | 1988-03-05 |
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