JPS58127595A - Current limiting circuit for inverter - Google Patents
Current limiting circuit for inverterInfo
- Publication number
- JPS58127595A JPS58127595A JP57007229A JP722982A JPS58127595A JP S58127595 A JPS58127595 A JP S58127595A JP 57007229 A JP57007229 A JP 57007229A JP 722982 A JP722982 A JP 722982A JP S58127595 A JPS58127595 A JP S58127595A
- Authority
- JP
- Japan
- Prior art keywords
- output
- current
- circuit
- value
- voltage
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は交流電動機を負荷とするインバータ装置の電流
制@回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current control circuit for an inverter device whose load is an AC motor.
以下%第1図ないし纂3図にもとづいて誘導電動機を負
荷とするすべり周波数制御方式可変電圧可変周波数イン
バータ装置の従来例についてa明する。第1図は、すべ
り餉御方に、Pu1a・Wid−th Modulat
ion(以下PWMと称す)電圧制御形インノ4−夕の
概略ブロック構成図である。図に於いて、 it!三相
交流商用電源、2はこの三相交流電源から直流電圧管得
るダイオード、又はサイリスタ等で構成された整R回路
%3#i直流電圧平滑用フィルター、4はトランジスタ
等のスイッチング素子で構成されたインパー2回路、5
#i負荷の交流電動機、6社運度検出器、7は負荷電動
機5の連置基準管与える速度指令回路、8は速度検出器
6の出力信号を増巾する速度検出回路、9は速度指令回
路7の出力信号”refと速度検出回路8の出力信号ω
との偏差を増巾するすべり周波数信号増中器、10はす
ベヤ周波数信号増巾器9の出力信号#8と速度検出回路
8の出力信号ωとの和信号即ち、周波数指令信号参〇に
比例した周波数のパルス列を出力する電圧/Δルス変換
器、11は上記04号から負荷電動機5のV/F特性に
見合った電圧レベルを出力する電圧指令回路、12は上
記1G、11の出力が入力されPWM制御のための基準
電圧波形Yt比出力る基卑電圧波形形成回路、13はイ
ンバータの出力電圧を検出する電圧検出回路、14ti
12の基準電圧波形形成回路の出力と電圧検出回路43
の出力との偏差からインバータ回路番のスイッチング素
子管オン、オフさせるための信号を作るPWM制御回路
である。A conventional example of a slip frequency control type variable voltage variable frequency inverter device using an induction motor as a load will be explained below based on FIGS. 1 to 3. Figure 1 shows Pu1a Wid-th Modulat
ion (hereinafter referred to as PWM) voltage-controlled type Inno-4-Y is a schematic block configuration diagram. In the diagram, it! Three-phase AC commercial power supply, 2 is a rectifier R circuit composed of diodes or thyristors, etc. that obtain a DC voltage tube from this three-phase AC power supply %3#i DC voltage smoothing filter, 4 is composed of switching elements such as transistors Imper 2 circuits, 5
#i Load AC motor, 6 company operation detector, 7 is a speed command circuit that provides a parallel reference tube for the load motor 5, 8 is a speed detection circuit that amplifies the output signal of the speed detector 6, 9 is a speed command The output signal ref of the circuit 7 and the output signal ω of the speed detection circuit 8
The sum signal of the output signal #8 of the slip frequency signal amplifier 10 and the output signal ω of the speed detection circuit 8, that is, the frequency command signal A voltage/Δlus converter that outputs a pulse train with a proportional frequency; 11 is a voltage command circuit from the above No. 04 that outputs a voltage level that matches the V/F characteristic of the load motor 5; 12 is a voltage command circuit that outputs a voltage level corresponding to the V/F characteristic of the load motor 5; A base voltage waveform forming circuit that receives an input and outputs a reference voltage waveform Yt ratio for PWM control; 13 is a voltage detection circuit that detects the output voltage of the inverter; 14ti
12 reference voltage waveform forming circuit output and voltage detection circuit 43
This is a PWM control circuit that creates a signal to turn on and off the switching element tube of the inverter circuit number based on the deviation from the output of the inverter circuit.
m2図は、誘導電動機の回転速度に対するトルク、電R
%性図であって、負荷トルクTCt負って力状態で運転
さnている場合を例示している。The m2 diagram shows the torque and electric R relative to the rotational speed of the induction motor.
This is a graph showing the case where the vehicle is operated in a force state with a load torque TCt.
ここで、Nは電動機の回転速度、烏は同期回転速度であ
り、N%凡はそれぞn第1図の信号速度検出回路8から
の出力ω、ω・ に、又Ne−Nがωo−ω、すなわち
周波数信号増巾器9の出力信号ω。Here, N is the rotational speed of the electric motor, and C is the synchronous rotational speed. ω, that is, the output signal ω of the frequency signal amplifier 9.
に対応するようになっている。諷1図のすべり周波数信
号増巾器9の働きにより、負荷トルクTLの変化に伴な
い、電動機の回転速fNが変化しようとすると、周波数
信号増巾器9の出力信号ω。It is designed to correspond to Due to the function of the slip frequency signal amplifier 9 shown in Figure 1, when the rotational speed fN of the motor is about to change as the load torque TL changes, the output signal ω of the frequency signal amplifier 9 changes.
が変化し、その結果、ω・ 即ち、同期回転速度N・が
横軸方向に調節さt、電動機の速![Nt−一定に保つ
ように動作する。又、過負荷に対しては、すべり周波数
信号増巾器9に出力クランプ機II!をもたせ、こft
Kより負荷電動機電流が電動機の特性できまる一定値以
上に増えないように抑制することが通常行なわnている
。纂3図は、★荷トルクTLが増し%ω、が増加し、フ
ラング値ωamaxKなった状mt−例示したもので、
電流は工・Oに制限さnる。changes, and as a result, ω・, that is, the synchronous rotational speed N・ is adjusted in the transverse direction t, the speed of the motor! [Nt - Operates to keep constant. In addition, for overload, the output clamp device II is installed in the slip frequency signal amplifier 9! Let's hold it together
Normally, the load motor current is suppressed from increasing beyond a certain value determined by the characteristics of the motor. Figure 3 shows an example of mt in which the load torque TL increases, %ω increases, and the flang value ωamaxK.
The current is limited to +0.
ところが、q#に加減速時やカ行−回生の移行時及び正
逆転運転時などの速度急変時に於いては。However, when the speed suddenly changes, such as during acceleration/deceleration in q#, during a transition between power and regeneration, and during forward/reverse operation.
インバータ周波数が急変するため(−3が急変し。Because the inverter frequency suddenly changes (-3 suddenly changes.
その結果ω・ が急変する)、電動機にはその霞起電圧
とインバータ出力電圧との過渡的な位相ずnのため、■
・・以上の電流が流れる。即ち、過渡的に電流のとび出
し現象がある。この九め、従来ω・の変化率を一定値以
下に抑えることにより、電流のとび出し現象を切上して
いたが、インバータ装置の応答が悪く、過酷な使用に耐
えらnなかった。As a result, ω・ suddenly changes), and due to the transient phase difference n between the haze electromotive voltage and the inverter output voltage,
A current of more than ... flows. In other words, there is a transient current jump phenomenon. Ninth, conventionally, the current jump phenomenon has been suppressed by suppressing the rate of change of ω to below a certain value, but the response of the inverter device was poor and it could not withstand severe use.
本発明は上述した事情に鑑みてなさ−rしたもので、上
述のような速度急変時にも過渡的な電流とび出しがなく
、安定で応答性の高いインバータ装置の電流制@回路を
提供することt目的とじ九ものである。The present invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a current control @ circuit for an inverter device that is stable and highly responsive without transient current jump even when the speed suddenly changes as described above. It has nine purposes.
以下、本発明による実施例1m4図ないしm7図にもと
づいて詳細に説明する。図中、従来例と対応する箇所及
び部品には同一符号を付して説明を省略する。Embodiment 1 of the present invention will be described in detail below based on Figures 1m4 to 17m. In the drawings, parts and parts corresponding to those of the conventional example are given the same reference numerals, and explanations thereof will be omitted.
属4図は、本発明の一実1/IA例を示す!ロック図で
あり、従来例の第1図に対し15.16.17が追加さ
nている。15けインバータの負荷電流を検出する電流
検出器、16は周波数補正回路で電流検出器15の出力
信号工とすべり周波数信号増巾器9の出力mlが入力さ
nl例えば属5図に示す如<、I信号に対して電流制限
値Iox の不感帯を有し、ωBの符号と同符号の信号
が出力さf′L%ω6に減算さnるように構成さnる。Figure 4 shows an example 1/IA of the present invention! This is a lock diagram, and 15, 16, and 17 are added to the conventional example shown in FIG. 1. 15 A current detector detects the load current of the inverter, 16 is a frequency correction circuit, and the output signal of the current detector 15 and the output ml of the slip frequency signal amplifier 9 are input. , has a dead zone of the current limit value Iox for the I signal, and is configured such that a signal having the same sign as ωB is output and subtracted from f′L%ω6.
又17は電流検出器15の出力が入力さn%第第6忙忙
示如(Iox 以上で出力を発生する電圧補正回路で、
この出力信号は、電圧指令回[11に入力さ扛、定常運
転値に対して瞬、時に一定比車だけ、11の出力が減少
するように構成さnている。又、電流IがIox以下に
復帰したとき、電圧指令回路11の出力は、ある時定数
をもって漸時定常値に復帰するように回路は構成さnて
いる。In addition, 17 is a voltage correction circuit that generates an output when the output of the current detector 15 is inputted to n% or more (Iox),
This output signal is input to the voltage command circuit 11, and is configured such that the output of the voltage command 11 decreases instantaneously, sometimes by a constant ratio, with respect to the steady-state operating value. Further, the circuit is configured such that when the current I returns to below Iox, the output of the voltage command circuit 11 gradually returns to a steady value with a certain time constant.
上述したように構成さnた本発明によるインバータ装置
に於ては、負荷急変時電流制限値1ox管越える電流が
RrLると、例えばカ行時においては、インバータ出力
周波数f及び出力電圧Vはそatでの運転値から瞬時に
減少し、電動機電流は急激に減少する。この結果、11
7図に示すように電動機電#iがIOX 以下に減少す
るとインバータ出力周波数は定常値に復帰し、こnより
遅nて出力電圧も定常値に復帰する。In the inverter device according to the present invention configured as described above, when the current exceeds the current limit value 1ox tube at the time of sudden load change RrL, the inverter output frequency f and output voltage V become It instantly decreases from the operating value at at, and the motor current rapidly decreases. As a result, 11
As shown in FIG. 7, when the motor #i decreases below IOX, the inverter output frequency returns to its steady value, and the output voltage also returns to its steady value later than n.
ここで、出力電圧の復帰を漸時性なうことにより、イン
バータ出力周波数が定常値に復帰する際の過渡的な位相
ずnによる電流増加も抑制される。Here, by gradually returning the output voltage, an increase in current due to a transient phase shift n when the inverter output frequency returns to a steady value is also suppressed.
又、回生時に於ては、瞬時にインバータ出力周波数fが
増加、又出力電圧Vが減少し、電流復帰後はカ行時と同
様に定常値に復帰する。このようにして、過大な電rI
Lが速やかに抑制さn1又電流制限値管越える時のみ作
用することにより、定常の応答性を損なうことなく、安
定した信頼性の高い運転が保証さnる。Also, during regeneration, the inverter output frequency f increases instantaneously, and the output voltage V decreases, and after the current is restored, it returns to the steady value as in the case of power. In this way, excessive current rI
By quickly suppressing L and acting only when the current limit value exceeds n1, stable and reliable operation is guaranteed without impairing steady-state responsiveness.
尚、上配観明では電流検出器15t−インバータ出力側
に構成した場合を述べたが、直流側に15′のように構
成しても弊価な効果が期待できることはいうまでもない
。Incidentally, in the above overview, a case has been described in which the current detector 15t is configured on the inverter output side, but it goes without saying that even if it is configured as 15' on the DC side, a valuable effect can be expected.
以上、詳細に説明したように1本発明によれば、構成が
簡単であり、負荷電流が〒定値以上流nたときのみ、す
ペクと出力電圧を抑制するように制御することにより、
容易に過大な電流を抑制でき応答性全損なうことなく、
安定かつ信頼性の高いインバータ装置が得らnるという
効果がある。As described in detail above, according to the present invention, the configuration is simple, and the output voltage is controlled to be suppressed only when the load current flows beyond a predetermined value.
Easily suppresses excessive current without sacrificing responsiveness.
This has the effect of providing a stable and highly reliable inverter device.
a!1図は従来のすべり制御方式PWM電圧制御形イン
バータ装置の概略ブロック図、112図、鳳3図は誘導
電動機の回転数に対するトルク、電流特性図、第4図は
この発明の一実施例を示すインバータ装置のブロック図
、第5図は周波全補正回路の出力特性の1例會示す図、
![6図は電圧補正回路の出力特性の1例を示す図、I
L7図はこの発明による回路の動作を示す図である。
1・・・・・・三相交流電源%2・・・・・・整流器、
3・・・・・・平滑用フィルター、4・・・・・・イン
バ−タ装置、5・・川・負荷交流電動機、6・・・・・
・速度検出@%7・・・・・・速成指令回路、8・・・
・・・速度検出回路%9・・−・・・すべり周波数信号
増巾器、10・・・・・・電圧//4ルス変換器、11
・・・・・・電圧指令回路%12・・・・・・基準電圧
波形形成回路%13・・・・・・電圧検出回路、14・
・・・・・PWM制御回路%15,15’・・・・・・
電流検出器、16・・・・・・周波数補正回路、17・
・・・・・電圧補正回路。
特 許 出 願 人 三菱電機株式会社代理人
葛野信−(外1名)
第2図
し
第3図
(7
第5図
エ
カ
第 7 図
手続補正書(自発)
↑、¥許庁長宮殿
1、事件の表示 特願昭 1f−7!雪・嗜2、
発明の名称
インバータ偏置0@滝制膳−路
3、補正をする者
代表者片山仁へ部
4、代理人
3;
& 補正の対象
「明絹書or発明の詳細な説明」ノ欄」、「Iji細書
の1図面の簡単な説@10欄」、「図面j。
亀 補正の内容
(1)@細書ms頁第7行目、
「−・負荷トルクTct”iとあるのtlr−・・負荷
トルクT&t=Jと補正する。
(2)同書jl[3頁第8行目、
「Nカ状態で運転・・・」とあるのを、「て力行状態で
運転−1と補正する。
(3) 同書jl17頁第17行目、r−ms図は濁
液全補正・・・」とあるのを、r−・・第5図、紘周波
数補正・・・jと補正する。
(4)IIWO纂2図、第3図を別紙添付のように補正
する。
)aa! Fig. 1 is a schematic block diagram of a conventional slip control type PWM voltage control type inverter device, Fig. 112 and Otori Fig. 3 are torque and current characteristics diagrams with respect to rotational speed of an induction motor, and Fig. 4 shows an embodiment of the present invention. A block diagram of the inverter device, FIG. 5 is a diagram showing an example of the output characteristics of the total frequency correction circuit,
! [Figure 6 is a diagram showing an example of the output characteristics of the voltage correction circuit, I
Figure L7 is a diagram showing the operation of the circuit according to the present invention. 1... Three-phase AC power supply %2... Rectifier,
3... Smoothing filter, 4... Inverter device, 5... River/load AC motor, 6...
・Speed detection @%7... Speed generation command circuit, 8...
...Speed detection circuit %9...Slip frequency signal amplifier, 10...Voltage//4 pulse converter, 11
...... Voltage command circuit %12... Reference voltage waveform forming circuit %13... Voltage detection circuit, 14.
...PWM control circuit%15,15'...
Current detector, 16... Frequency correction circuit, 17.
...Voltage correction circuit. Patent applicant Mitsubishi Electric Corporation agent
Makoto Kuzuno - (1 other person) Figure 2 and Figure 3 (7 Figure 5 Eka Figure 7 Procedural amendment (voluntary) ↑, ¥Xu Commissioner's Palace 1, Incident display Patent application Sho 1f-7! Snow・Taste 2,
Name of the invention: Inverter eccentricity 0@Takiseizen-ro 3, Person making the amendment Representative: Hitoshi Katayama Department 4, Agent 3; "A simple explanation of one drawing in the Iji specification @column 10", "Drawing J. Contents of correction (1) @Specifications ms page 7th line, tlr where it says "--Load torque Tct"i... Correct the load torque T&t=J. (2) Ibid. JL [Page 3, line 8, "Run in N-power state..." is corrected to read "Run in power running state -1." (3) Ibid. JL, page 17, line 17. , r-ms diagram is turbid liquid total correction...'' is corrected as r-...Figure 5, Hiro frequency correction...j. (4) Amend Figures 2 and 3 of the IIWO compilation as attached. )a
Claims (1)
流が設定値以上に増えたとき、こrtt−検出し、交流
電動様のすべりが小さくなるようにインバータ周波数全
増減させると同時に出力電圧を抑え、負荷電流が設定値
以下におさまったと龜、イン/?−タ周波数を正規制御
値に復帰させる周波数補正回路と、出力電圧は周波数復
帰より遅らせて漸時復帰させる電圧補正回路とを備えた
ことを特徴とするインバータ装置の電流w@回路。In an inverter device that uses an AC motor as a load, when the load current increases above a set value, this is detected and the inverter frequency is fully increased or decreased to reduce the slip of the AC motor, while at the same time suppressing the output voltage. When the load current falls below the set value, the power is turned on/? - A current w@ circuit for an inverter device, comprising: a frequency correction circuit for restoring a motor frequency to a normal control value; and a voltage correction circuit for gradually restoring an output voltage with a delay from the frequency restoration.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57007229A JPS58127595A (en) | 1982-01-20 | 1982-01-20 | Current limiting circuit for inverter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57007229A JPS58127595A (en) | 1982-01-20 | 1982-01-20 | Current limiting circuit for inverter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58127595A true JPS58127595A (en) | 1983-07-29 |
Family
ID=11660158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57007229A Pending JPS58127595A (en) | 1982-01-20 | 1982-01-20 | Current limiting circuit for inverter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58127595A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5251521A (en) * | 1975-10-23 | 1977-04-25 | Meidensha Electric Mfg Co Ltd | Induction motor driving controlling circuit |
-
1982
- 1982-01-20 JP JP57007229A patent/JPS58127595A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5251521A (en) * | 1975-10-23 | 1977-04-25 | Meidensha Electric Mfg Co Ltd | Induction motor driving controlling circuit |
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