JPH03277180A - Voltage type inverter - Google Patents

Voltage type inverter

Info

Publication number
JPH03277180A
JPH03277180A JP2074477A JP7447790A JPH03277180A JP H03277180 A JPH03277180 A JP H03277180A JP 2074477 A JP2074477 A JP 2074477A JP 7447790 A JP7447790 A JP 7447790A JP H03277180 A JPH03277180 A JP H03277180A
Authority
JP
Japan
Prior art keywords
capacitor
electrolytic capacitor
ripple
voltage
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.)
Pending
Application number
JP2074477A
Other languages
Japanese (ja)
Inventor
Akitake Takizawa
聡毅 滝沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP2074477A priority Critical patent/JPH03277180A/en
Publication of JPH03277180A publication Critical patent/JPH03277180A/en
Pending legal-status Critical Current

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  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To lighten the burden on an electrolytic capacitor in an intermediate DC circuit by connecting the electrolytic capacitor for smoothing a DC power supply and a capacitor for absorbing the ripple having relatively small capacitance in parallel with the intermediate CC circuit. CONSTITUTION:A large capacitance electrolytic capacitor 2A for smoothing a power supply is connected across a rectifying circuit 1. A capacitor 2B absorbs ripple produced in an inverter section 3. High frequency wave produced during reverse conversion, e.g. PWM operation, in the inverter section 3 mainly flows into the ripple absorbing capacitor 2B having good frequency characteristic. Consequently, ripple current flowing into the electrolytic capacitor 2A connected in parallel decreases.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、主回路の構成を改良した電圧形インバータに
関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a voltage source inverter with an improved main circuit configuration.

(従来の技術) 従来の電圧形インバータの主回路構成を第4図に示す、
同図において、1はダイオードを3相ブリツジ接続して
なる整流回路であり、交流入力端子R,S、Tから入力
される3相交流電圧を直流電圧に変換するためのもので
ある。2は大容量の電解コンデンサであり、整流後の直
流電圧リプルの吸収及び後段のインバータ部3が発生す
る高調波(リプル)の吸収を行ない、直流中間回路の電
圧を脈動のない直流にするように作用している。更に、
3はトランジスタ及び逆並列接続されたダイオードから
なる上下アームを3相分備えたインバータ部であり、P
WM制御等によるトランジスタのスイッチングにより電
解コンデンサ2の両端の直流電圧を3相交流電圧に変換
して交流出力端子U、V、Wから出力している。
(Prior art) The main circuit configuration of a conventional voltage source inverter is shown in Figure 4.
In the figure, reference numeral 1 denotes a rectifier circuit formed by connecting diodes in a three-phase bridge, and is used to convert three-phase AC voltage input from AC input terminals R, S, and T into DC voltage. 2 is a large-capacity electrolytic capacitor that absorbs DC voltage ripples after rectification and harmonics (ripples) generated by the inverter section 3 in the subsequent stage, so that the voltage of the DC intermediate circuit becomes DC without pulsation. It is acting on Furthermore,
3 is an inverter section having three phases of upper and lower arms consisting of transistors and diodes connected in antiparallel;
The DC voltage across the electrolytic capacitor 2 is converted into a three-phase AC voltage by switching transistors under WM control or the like, and the voltage is output from AC output terminals U, V, and W.

(発明が解決しようとする課題) 上述した構成の電圧形インバータにおいて、直流中間回
路に用いている電解コンデンサ2はリプル電流の流入に
より他の構成要素に比べて寿命が比較的短いため、長期
にわたってインバータを使用する場合に、メンテナンス
や交換が必要となり、そのために多くの労力やコストが
必要になるという問題があった。
(Problems to be Solved by the Invention) In the voltage source inverter having the above-described configuration, the electrolytic capacitor 2 used in the DC intermediate circuit has a relatively short lifespan compared to other components due to the inflow of ripple current. When using an inverter, there is a problem in that maintenance and replacement are required, which requires a lot of labor and cost.

本発明は上記問題点を解決するために提案されたもので
、その目的とするところは、直流中間回路の電解コンデ
ンサの負担を少なくしてメンテナンス等の労力やコスト
の低減を図った電圧形インバータを提供することにある
The present invention was proposed in order to solve the above problems, and its purpose is to provide a voltage source inverter that reduces the burden on electrolytic capacitors in the DC intermediate circuit and reduces maintenance effort and costs. Our goal is to provide the following.

(課題を解決するための手段) 上記目的を達成するため、本発明では、直流電源の平滑
化を目的とした電解コンデンサと、リプル吸収を目的と
した比較的小容量のコンデンサとを直流中間回路に並列
接続するものである。
(Means for Solving the Problems) In order to achieve the above object, in the present invention, an electrolytic capacitor for the purpose of smoothing a DC power supply and a relatively small capacitor for the purpose of ripple absorption are connected to a DC intermediate circuit. are connected in parallel.

(作用) 本発明によれば、リプル吸収を目的としたコンデンサを
別個に設けたことにより、電解コンデンサに流れるリプ
ル電流が減少するため、電解コンデンサの負担を少なく
してその寿命を延ばすことができる。
(Function) According to the present invention, by separately providing a capacitor for ripple absorption, the ripple current flowing through the electrolytic capacitor is reduced, so the load on the electrolytic capacitor can be reduced and its lifespan can be extended. .

(実施例) 以下、図に沿って本発明の詳細な説明する。(Example) The present invention will be described in detail below with reference to the drawings.

第1図は本発明の第1実施例を示すものであり、第4図
と同一の構成要素には同一の符号を付して説明を省略す
る。
FIG. 1 shows a first embodiment of the present invention, and the same components as in FIG. 4 are given the same reference numerals and their explanations will be omitted.

第1図において、2Aは従来と同様の電源平滑を目的と
した大容量の電解コンデンサであり、このコンデンサ2
Aは整流回路1の両端に接続されている。また、2Bは
インバータ部3が発生する高調波(リプル)の吸収を目
的としたフィルムコンデンサ等のりプル吸収用コンデン
サであり、このコンデンサ2Bは耐リプル性が高く周波
数特性のよいものであれば、必ずしも大容量である必要
はない。
In Figure 1, 2A is a large-capacity electrolytic capacitor for the purpose of power supply smoothing, similar to conventional capacitors.
A is connected to both ends of the rectifier circuit 1. Further, 2B is a capacitor for absorbing ripple such as a film capacitor for the purpose of absorbing harmonics (ripples) generated by the inverter section 3. If this capacitor 2B has high ripple resistance and good frequency characteristics, It does not necessarily have to be large capacity.

この実施例によれば、インバータ部3のPWM動作等に
よる逆変換時に発生する高調波は、周波数特性のよいリ
プル吸収用コンデンサ2Bに多く流れるため、並列接続
された電解コンデンサ2Aに流れるリプル電流は従来例
に比べて減少する。
According to this embodiment, much of the harmonics generated during inverse conversion due to PWM operation of the inverter section 3 flows through the ripple absorbing capacitor 2B having good frequency characteristics, so that the ripple current flowing through the electrolytic capacitor 2A connected in parallel is This decreases compared to the conventional example.

また、第2図は本発明の第2実施例を示しており、この
実施例では各コンデンサ2A、2Bの一端の間に直流リ
アクトル4が接続されている。すなわちこの直流リアク
トル4によって電解コンデンサ2Aとリプル吸収用コン
デンサ2B間のインピーダンスを高くすることにより、
インバータ部3の動作時において電解コンデンサ2Aに
流れるリプル電流を一層減少させることができる。
Further, FIG. 2 shows a second embodiment of the present invention, in which a DC reactor 4 is connected between one end of each capacitor 2A, 2B. That is, by increasing the impedance between the electrolytic capacitor 2A and the ripple absorbing capacitor 2B using the DC reactor 4,
The ripple current flowing through the electrolytic capacitor 2A during operation of the inverter section 3 can be further reduced.

更に、第3図は本発明の第3実施例であり、この実施例
ではりプル吸収用コンデンサ2Bに並列に、電解コンデ
ンサ2Aと直流リアクトル4との直列回路が接続されて
いる。この実施例においても、第2実施例と同様に直流
リアクトル4のインピーダンスにより電解コンデンサ2
Aに流れるリプル電流が減少する。
Furthermore, FIG. 3 shows a third embodiment of the present invention, and in this embodiment, a series circuit of an electrolytic capacitor 2A and a DC reactor 4 is connected in parallel to the pull absorbing capacitor 2B. In this embodiment as well, the impedance of the DC reactor 4 causes the electrolytic capacitor 2 to
The ripple current flowing through A decreases.

なお、図示されていないが、整流回路1の正側出力端子
と電解コンデンサ2Aの正側端子との間に直流リアクト
ルを接続し、または系統側(交流入力端子R,S、T側
)に交流リアクトルを接続すれば、系統側から電解コン
デンサに流れ込むリプル電流を減少させることができる
Although not shown, a DC reactor may be connected between the positive side output terminal of the rectifier circuit 1 and the positive side terminal of the electrolytic capacitor 2A, or an AC By connecting a reactor, it is possible to reduce the ripple current flowing into the electrolytic capacitor from the grid side.

(発明の効果) 以上述べたように本発明によれば、直流中間回路に設け
られた電源平滑用の電解コンデンサにはインバータ部の
発する高調波電流がほとんど流れないため、従来に比べ
て電解コンデンサの寿命が延び、高信頼性かつメンテナ
ンスフリーの電圧形インバータを実現することができる
。従って、電解コンデンサの交換等に要する労力やコス
トの低減を図ることが可能である。
(Effects of the Invention) As described above, according to the present invention, almost no harmonic current generated by the inverter section flows through the power supply smoothing electrolytic capacitor provided in the DC intermediate circuit. The lifespan of the voltage source inverter is extended, and a highly reliable and maintenance-free voltage source inverter can be realized. Therefore, it is possible to reduce the labor and cost required for replacing the electrolytic capacitor.

【図面の簡単な説明】[Brief explanation of drawings]

第1図ないし第3図は本発明の第1ないし第3の実施例
を示す主回路の構成図、第4図は従来の技術を示す主回
路の構成図である。 1・・・整流回路  2A・・・電解コンデンサ2B・
・・リプル吸収用コンデンサ
1 to 3 are block diagrams of main circuits showing first to third embodiments of the present invention, and FIG. 4 is a block diagram of a main circuit showing a conventional technique. 1... Rectifier circuit 2A... Electrolytic capacitor 2B.
・Ripple absorption capacitor

Claims (1)

【特許請求の範囲】 入力交流電圧を直流電圧に変換して出力する整流回路と
、前記直流電圧を交流電圧に変換するインバータ部と、
前記整流回路及びインバータ部の間の直流中間回路に接
続された電源平滑用の電解コンデンサとを主回路に備え
た電圧形インバータにおいて、 前記電解コンデンサに並列にリプル吸収用コンデンサを
接続したことを特徴とする電圧形インバータ。
[Scope of Claims] A rectifier circuit that converts an input AC voltage into a DC voltage and outputs the same; an inverter unit that converts the DC voltage into an AC voltage;
A voltage source inverter having a main circuit including a power supply smoothing electrolytic capacitor connected to a DC intermediate circuit between the rectifier circuit and the inverter section, characterized in that a ripple absorbing capacitor is connected in parallel to the electrolytic capacitor. voltage source inverter.
JP2074477A 1990-03-23 1990-03-23 Voltage type inverter Pending JPH03277180A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2074477A JPH03277180A (en) 1990-03-23 1990-03-23 Voltage type inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2074477A JPH03277180A (en) 1990-03-23 1990-03-23 Voltage type inverter

Publications (1)

Publication Number Publication Date
JPH03277180A true JPH03277180A (en) 1991-12-09

Family

ID=13548391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2074477A Pending JPH03277180A (en) 1990-03-23 1990-03-23 Voltage type inverter

Country Status (1)

Country Link
JP (1) JPH03277180A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7710747B2 (en) 2006-12-11 2010-05-04 Fuji Electric Systems Co., Ltd. Voltage-source inverter apparatus utilizing ripple voltage
WO2012093486A1 (en) * 2011-01-07 2012-07-12 東芝三菱電機産業システム株式会社 Electric power converter
US9061165B2 (en) 2009-01-28 2015-06-23 Naoko Iwagaki Solution for forming double eyelid and method for forming double eyelid using same
JP2017143647A (en) * 2016-02-10 2017-08-17 株式会社日立製作所 Power converter device
JP2021013291A (en) * 2019-07-05 2021-02-04 パナソニックIpマネジメント株式会社 Power converter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7710747B2 (en) 2006-12-11 2010-05-04 Fuji Electric Systems Co., Ltd. Voltage-source inverter apparatus utilizing ripple voltage
US9061165B2 (en) 2009-01-28 2015-06-23 Naoko Iwagaki Solution for forming double eyelid and method for forming double eyelid using same
WO2012093486A1 (en) * 2011-01-07 2012-07-12 東芝三菱電機産業システム株式会社 Electric power converter
US20130208518A1 (en) * 2011-01-07 2013-08-15 Toshiba Mitsubishi-Electric Industrial Systems Corporation Electric power converter
KR101452146B1 (en) * 2011-01-07 2014-10-16 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 Electric power converter
JP5653458B2 (en) * 2011-01-07 2015-01-14 東芝三菱電機産業システム株式会社 Power converter
US9438135B2 (en) 2011-01-07 2016-09-06 Toshiba Mitsubishi-Electric Industrial Systems Corporation Electric power converter including a stabilization circuit
JP2017143647A (en) * 2016-02-10 2017-08-17 株式会社日立製作所 Power converter device
JP2021013291A (en) * 2019-07-05 2021-02-04 パナソニックIpマネジメント株式会社 Power converter

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