JP3019931B2 - Inverter device - Google Patents
Inverter deviceInfo
- Publication number
- JP3019931B2 JP3019931B2 JP3032220A JP3222091A JP3019931B2 JP 3019931 B2 JP3019931 B2 JP 3019931B2 JP 3032220 A JP3032220 A JP 3032220A JP 3222091 A JP3222091 A JP 3222091A JP 3019931 B2 JP3019931 B2 JP 3019931B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output
- circuit
- current
- detection circuit
- 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
- Protection Of Static Devices (AREA)
- Control Of Voltage And Current In General (AREA)
- Inverter Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、インバータ装置に関す
るもので、さらに詳しく言えばインバータ装置から出力
される交流電流を検出して交流電圧を垂下させる制御回
路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 device, and more particularly, to a control circuit for detecting an AC current output from an inverter device and dropping an AC voltage.
【０００２】[0002]
【従来の技術】直流電力を交流電力に変換するインバー
タ装置は、出力される交流電圧を定電圧制御するととも
に、交流電流を検出して瞬時電流を抑制したり、交流電
圧を垂下させる制御回路が設けられている。2. Description of the Related Art An inverter device for converting DC power into AC power has a control circuit that controls an output AC voltage at a constant voltage, detects an AC current, suppresses an instantaneous current, or droops an AC voltage. Is provided.
【０００３】上記の如きインバータ装置は、近年その制
御回路にマイクロコンピュータを用いたものが増加し、
特に交流電圧を定電圧制御するための基準正弦波をマイ
クロコンピュータによって作成するものが知られてい
る。In recent years, the number of inverter devices using microcomputers in their control circuits has increased.
In particular, there has been known a method in which a reference sine wave for controlling an AC voltage at a constant voltage is created by a microcomputer.
【０００４】このようなマイクロコンピュータを用いた
制御回路は図２のようなものである。すなわち、図２に
おいて、１は直流電源で、逆変換部２によって前記直流
電源１からの直流電力が交流電力に変換され、得られた
交流電圧を検出する電圧検出回路３と、この電圧検出回
路３の出力を実効値に変換する電圧実効値変換器４と、
この電圧実効値変換器４の出力をディジタル変換する電
圧変換回路５とを備え、この電圧変換回路５の出力がマ
イクロコンピュータ６に入力され、このマイクロコンピ
ュータ６内の電圧基準値と比較されて基準正弦波を発生
させるとともに、前記電圧検出回路３の出力を前記基準
正弦波に一致させるための補正正弦波を出力させる電圧
補正回路７と、この電圧補正回路７の出力を入力して制
御信号を発生させる変調回路８とを有してなるものであ
る。この変調回路８からの制御信号は駆動回路９によっ
て前記逆変換部２を構成するスイッチング素子の駆動信
号となる。なお、図２において、電圧検出回路３によっ
て直接電圧実効値が検出できれば電圧実効値変換器４は
不用であることは言うまでもない。A control circuit using such a microcomputer is as shown in FIG. That is, in FIG. 2, reference numeral 1 denotes a DC power supply, a DC power from the DC power supply 1 is converted into AC power by an inverse converter 2, and a voltage detection circuit 3 for detecting an obtained AC voltage; A voltage rms converter 4 for converting the output of 3 into an rms value;
A voltage conversion circuit 5 for digitally converting an output of the voltage effective value converter 4; an output of the voltage conversion circuit 5 is input to a microcomputer 6; A voltage correction circuit 7 for generating a sine wave and outputting a corrected sine wave for matching the output of the voltage detection circuit 3 with the reference sine wave, and inputting the output of the voltage correction circuit 7 to output a control signal And a modulation circuit 8 for generating the signal. The control signal from the modulation circuit 8 is used as a drive signal for a switching element constituting the inverse converter 2 by the drive circuit 9. In FIG. 2, it is needless to say that the effective voltage value converter 4 is unnecessary if the effective voltage value can be directly detected by the voltage detection circuit 3.
【０００５】上記の如き制御回路よって交流電圧を垂下
させるには、マイクロコンピュータ６内の電圧基準値を
低下させるようなソフトウェアを構成する必要があっ
た。In order to make the AC voltage droop by the control circuit as described above, it is necessary to configure software for lowering the voltage reference value in the microcomputer 6.
【０００６】[0006]
【発明が解決しようとする課題】上記した従来のインバ
ータ装置では、定常的な過負荷に起因する内部温度の上
昇を抑制するために速やかに垂下動作を行わせる必要性
から、その制御系のゲインを大きくしているが一般的
で、制御系が不安定になりやすいという問題点があっ
た。また、一旦電圧基準値を低下させると、以後はその
電圧基準値によって制御されるという問題点があった。In the above-mentioned conventional inverter device, since it is necessary to quickly perform a drooping operation in order to suppress a rise in the internal temperature caused by a steady overload, the gain of the control system is increased. However, there is a problem that the control system is likely to be unstable. Further, once the voltage reference value is lowered, there is a problem that the voltage reference value is thereafter controlled by the voltage reference value.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、直流電源と、この直流電源からの直流電
力を交流電力に変換する逆変換部と、この逆変換部を構
成するスイッチング素子の駆動信号を作成する駆動回路
と、この駆動回路に入力される制御信号を発生させる制
御回路とからなり、前記制御回路が交流電圧を検出する
電圧検出回路と、この電圧検出回路の出力をディジタル
変換する電圧変換回路と、交流電流を検出する電流検出
回路と、この電流検出回路の出力をディジタル変換する
電流変換回路と、前記電圧変換回路の出力を入力し、電
圧基準値と比較して基準正弦波を発生させるマイクロコ
ンピュータと、この基準正弦波と前記電圧検出回路の出
力とを比較して補正正弦波を出力させる電圧補正回路
と、この電圧補正回路の出力を入力して制御信号を発生
させる変調回路とから構成され、かつ前記電流変換回路
の出力を前記マイクロコンピュータに入力し、電流制限
値とを比較して前記電圧基準値をディジタル的に変化さ
せる機能を備えたことを特徴とするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a DC power supply, an inverse converter for converting DC power from the DC power supply into AC power, and a switching device constituting the inverse converter. A drive circuit for generating a drive signal for the element, and a control circuit for generating a control signal to be input to the drive circuit, wherein the control circuit detects an AC voltage, and outputs the output of the voltage detection circuit. A voltage conversion circuit for digital conversion, a current detection circuit for detecting an alternating current, a current conversion circuit for digitally converting the output of the current detection circuit, and an output of the voltage conversion circuit are input and compared with a voltage reference value. A microcomputer for generating a reference sine wave, a voltage correction circuit for comparing the reference sine wave with the output of the voltage detection circuit and outputting a corrected sine wave, and a voltage correction circuit A modulation circuit for receiving an output to generate a control signal, and inputting the output of the current conversion circuit to the microcomputer, comparing the current reference value with the current limit value, and digitally changing the voltage reference value. It is characterized by having a function.
【０００８】[0008]
【作 用】従って、本発明は電流変換回路の出力と電流
制限値とを比較して電圧基準値をディジタル的に変化さ
せているので、制御系のゲインを大きくしても垂下時に
制御系が不安定になることはない。According to the present invention, the output of the current conversion circuit is compared with the current limit value to digitally change the voltage reference value. It does not become unstable.
【０００９】[0009]
【実施例】図１は、本発明のインバータ装置のブロック
図で、図２と同じ機能を有する部分には同じ符号を付し
て以下の説明を省略する。FIG. 1 is a block diagram of an inverter device according to the present invention. Portions having the same functions as those in FIG. 2 are denoted by the same reference numerals, and the following description is omitted.
【００１０】本発明の特徴は、交流電流を検出する電流
検出回路１０と、この電流検出回路１０の出力を実効値
に変換する電流実効値変換器１１と、この電流実効値変
換器１１の出力をディジタル変換する電流変換回路１２
とを設け、この電流変換回路１２の出力をマイクロコン
ピュータ６に入力し、電流制限値と比較して電圧基準値
をディジタル的に変化させるようにしたことである。The features of the present invention include a current detection circuit 10 for detecting an alternating current, a current effective value converter 11 for converting an output of the current detection circuit 10 into an effective value, and an output of the current effective value converter 11. Current conversion circuit 12 for digitally converting
The output of the current conversion circuit 12 is input to the microcomputer 6 and compared with the current limit value to digitally change the voltage reference value.
【００１１】すなわち、前記電流変換回路１２の出力が
マイクロコンピュータ６内の電流制限値より大である場
合、その差に比例させて電圧基準値をディジタル的に低
下させ、電流制限値より小である場合、一定値だけ電圧
基準値をディジタル的に上昇させているので、制限系の
ゲインを大きくしても、垂下時に制御系が不安定になる
ことはなく、特に、一定値だけ電圧基準値をディジタル
的に上昇させることにより、定常的な過負荷に起因する
制限された電圧基準値で継続して定電圧制御されること
が防止できる。That is, when the output of the current conversion circuit 12 is larger than the current limit value in the microcomputer 6, the voltage reference value is digitally reduced in proportion to the difference, and is smaller than the current limit value. In this case, since the voltage reference value is digitally increased by a constant value, even if the gain of the limiting system is increased, the control system does not become unstable when drooping. By digitally increasing the voltage, it is possible to prevent the constant voltage control from being continuously performed at the limited voltage reference value due to the steady overload.
【００１２】なお、電流検出回路１０によって直接電流
実効値が検出できれば電流実効値変換器１１は不用であ
ることは言うまでもない。It is needless to say that the current effective value converter 11 is unnecessary if the current effective value can be directly detected by the current detection circuit 10.
【００１３】[0013]
【発明の効果】上記した如く、本発明は垂下時の動作を
安定化することができる。As described above, the present invention can stabilize the operation when drooping.
【図１】本発明のインバータ装置のブロック図である。FIG. 1 is a block diagram of an inverter device according to the present invention.
【図２】従来のインバータ装置のブロック図である。FIG. 2 is a block diagram of a conventional inverter device.
３ 電圧検出回路 ５ 電圧変換回路 ６ マイクロコンピュータ １０ 電流検出回路 １２ 電流変換回路 3 voltage detection circuit 5 voltage conversion circuit 6 microcomputer 10 current detection circuit 12 current conversion circuit
Claims (2)
力を交流電力に変換する逆変換部と、この逆変換部を構
成するスイッチング素子の駆動信号を作成する駆動回路
と、この駆動回路に入力される制御信号を発生させる制
御回路とからなり、前記制御回路が交流電圧を検出する
電圧検出回路と、この電圧検出回路の出力をディジタル
変換する電圧変換回路と、交流電流を検出する電流検出
回路と、この電流検出回路の出力をディジタル変換する
電流変換回路と、前記電圧変換回路の出力を入力し、電
圧基準値と比較し、基準正弦波を発生させるマイクロコ
ンピュータと、この基準正弦波と前記電圧検出回路の出
力とを比較して補正正弦波を出力させる電圧補正回路
と、この電圧補正回路の出力を入力して制御信号を発生
させる変調回路とから構成され、かつ前記電流変換回路
の出力を前記マイクロコンピュータに入力し、電流制限
値と比較して前記電圧基準値をディジタル的に変化させ
る機能を備えたことを特徴とするインバータ装置。1. A DC power supply, an inverse converter for converting DC power from the DC power to AC power, a drive circuit for generating a drive signal for a switching element constituting the inverse converter, and A voltage detection circuit for detecting an AC voltage, a voltage conversion circuit for digitally converting an output of the voltage detection circuit, and a current detection circuit for detecting an AC current. Circuit, a current conversion circuit for digitally converting the output of the current detection circuit, a microcomputer for receiving the output of the voltage conversion circuit, comparing the voltage with a voltage reference value, and generating a reference sine wave, A voltage correction circuit that compares the output of the voltage detection circuit to output a corrected sine wave, and a modulation circuit that receives the output of the voltage correction circuit and generates a control signal. An inverter device having a function of inputting the output of the current conversion circuit to the microcomputer and comparing the voltage reference value with a current limit value digitally.
である場合、その差に比例させて電圧基準値を低下さ
せ、電流制限値より小である場合、一定値だけ電圧基準
値を上昇させることを特徴とする請求項第１項記載のイ
ンバータ装置。2. When the output of the current conversion circuit is larger than the current limit value, the voltage reference value is decreased in proportion to the difference, and when the output is smaller than the current limit value, the voltage reference value is increased by a constant value. 2. The inverter device according to claim 1, wherein the inverter device is operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3032220A JP3019931B2 (en) | 1991-01-31 | 1991-01-31 | Inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3032220A JP3019931B2 (en) | 1991-01-31 | 1991-01-31 | Inverter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04244787A JPH04244787A (en) | 1992-09-01 |
| JP3019931B2 true JP3019931B2 (en) | 2000-03-15 |
Family
ID=12352861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3032220A Expired - Fee Related JP3019931B2 (en) | 1991-01-31 | 1991-01-31 | Inverter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3019931B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4664699B2 (en) * | 2005-02-10 | 2011-04-06 | 株式会社東芝 | Parallel operation controller for power converter |
-
1991
- 1991-01-31 JP JP3032220A patent/JP3019931B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04244787A (en) | 1992-09-01 |
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