JP3536425B2 - Inrush current prevention circuit for voltage type inverter - Google Patents
Inrush current prevention circuit for voltage type inverterInfo
- Publication number
- JP3536425B2 JP3536425B2 JP12957295A JP12957295A JP3536425B2 JP 3536425 B2 JP3536425 B2 JP 3536425B2 JP 12957295 A JP12957295 A JP 12957295A JP 12957295 A JP12957295 A JP 12957295A JP 3536425 B2 JP3536425 B2 JP 3536425B2
- Authority
- JP
- Japan
- Prior art keywords
- reactor
- smoothing capacitor
- circuit
- contactor
- current
- 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
- Rectifiers (AREA)
- Control Of Voltage And Current In General (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、インバータ装置におけ
る順変換部の直流中間回路に関する。
【０００２】
【従来の技術】従来のインバータの整流回路は図３に示
すようになっている。図において、１はＤＣリアクトル
であり、入力電流波形改善のために設けられている。２
は突入電流抑制抵抗、３はコンタクタ、４は三相交流電
圧を整流する整流回路ブリッジ、５は平滑コンデンサ、
６はコンタクタ制御手段、７は平滑コンデンサ両端の電
圧を測定する電圧検出手段、８は電圧検出手段７からの
出力信号に基づいてインバータ部９を制御するインバー
タ制御手段、１０はダイオードである。次に構成を説明
する。交流電源に接続された整流回路ブリッジ４の直流
側にＤＣリアクトルと平滑コンデンサが接続された順変
換部の直流中間回路において、コンタクタ３とＤＣリア
クトル１を直列接続した直列接続回路と、前記平滑コン
デンサへ充電電流を通す向きに取りつけたダイオード１
０と突入電流抑制抵抗２を直列接続した直列接続回路と
を互いに並列接続した並列接続回路と前記平滑コンデン
サとを前記整流回路ブリッジ４の直流出力側端子間に直
列接続して構成されている。次に動作を説明する。イン
バータ制御手段８は、電圧検出手段７により整流回路ブ
リッジ４の直流出力側の電圧Ｖ0 および平滑コンデンサ
５の端子電圧Ｖ1 を検出し、Ｖ0 、Ｖ1 両者の大きさに
基づいて平滑コンデンサ５の充電状態を確認する。Ｖ0
とＶ1 の差があらかじめ設定した基準値より大きい場
合、インバータ制御手段８は、コンタクタ制御手段６を
介してコンタクタ３を開き、整流回路ブリッジ４からの
電流をダイオード１０と突入電流抑制抵抗器２を介し
て、平滑コンデンサ５へと導くようにしている。次にＶ
0 とＶ1 の差が基準値より小さくなった場合、インバー
タ制御手段８は、コンタクタ制御手段６を介してコンタ
クタ３を閉じ、突入電流抑制抵抗器を短絡し、整流回路
ブリッジ４からの電流をＤＣリアクトル１を通し、平滑
コンデンサ５へと導くようにする。インバータ制御手段
８からはインバータ部９にある主回路スイッチング素子
のベース（ゲート）へ制御信号が出力される。
【０００３】
【発明が解決しようとする課題】ところが、従来技術で
は平滑コンデンサ５の充電中に何らかの原因でコンタク
タ３の接点が突然に開いた場合、直流リアクトルに蓄え
られた電磁エネルギーによりコンタクタ３の接点間でア
ーク放電が発生し、コンタクタの接点寿命を損なった
り、接点が溶解してしまうという問題があった。そこ
で、本発明は平滑コンデンサ５の充電中にコンタクタ３
の接点が突然開いた場合でも接点間にアーク放電が発生
すること防止することを目的とする。
【０００４】
【課題を解決するための手段】上記問題を解決するため
に、本発明は、交流電源に接続された整流回路ブリッジ
４の直流側に平滑コンデンサ５が接続された順変換部の
直流中間回路であって、コンタクタ３とＤＣリアクトル
１を直列接続した直列接続回路と、前記平滑コンデンサ
５へ充電電流を通す向きに取りつけたダイオード１０と
突入電流抑制抵抗２を直列接続した直列接続回路とを互
いに並列接続した並列接続回路と、前記平滑コンデンサ
５とを前記整流回路ブリッジ４の直流出力側端子間に直
列接続した電圧形インバータの突入電流防止回路におい
て、前記コンタクタ３とＤＣリアクトル１間の接続点と
ダイオード１１のカソードを接続して前記平滑コンデン
サの陰極側に前記ダイオード１１のアノードを接続し、
前記ＤＣリアクトル１が、リアクトル電流により生じる
直流磁界と逆方向に磁気バイアスを与える永久磁石を組
み込んだＤＣリアクトルとしたものである。
【０００５】
【作用】上記手段により、通電中にコンタクタ３の接点
が突然開いた場合、ＤＣリアクトル１に蓄えられた電磁
エネルギーＥ（＝０．５ＬＩ2 ジュール、Ｌ：ＤＣリア
クトルのインダクタンス、Ｉ：電流）はＤＣリアクトル
１と平滑コンデンサ５とダイオード１１を通る循環電流
となって消費されるので、コンタクタ３の接点にアーク
放電は発生しない。
【０００６】
【実施例】以下、本発明の実施例を図に基づいて説明す
る。本発明の構成ブロック図を図１に示す。各部の名称
に関しては、従来の構成ブロック図を示す図３と同じ名
称について同一符号を用いているので、重複説明を省略
する。１１はダイオードである。従来の構成と異なる点
は、前記コンタクタ３とＤＣリアクトル１間の接続点に
ダイオード１１のカソード側を接続して前記平滑コンデ
ンサの負極側に前記ダイオード１１のアノード側を接続
した点である。次に動作を説明する。従来の技術と同様
にして、インバータ制御手段８は次の（ア）〜（ウ）の
どれかの公知技術に基づいて平滑コンデンサ５の充電状
態を検出し、コンタクタ３を開閉する信号を作成し、コ
ンタクタ制御手段６へ開閉信号を出力する。
（ア）平滑コンデンサ５の充電電圧を直接計測する電圧
検出手段７を用いる。
（イ）平滑コンデンサ５の充電電流を直接検出する電流
検出手段を用いる。
（ウ）電源投入後一定時間経過したことを計測する時間
計測手段を用いる。
コンタクタ３は、コンタクタ制御手段６により駆動され
る。平滑コンデンサ５の充電状態があらかじめ設定した
基準値以下であるとインバータ制御手段８が判断すると
コンタクタ３を開き突入電流がＤＣリアクトル１に全く
流れないようにする。通電中にコンタクタ３を開いた瞬
間にＤＣリアクトル１には電磁誘導の法則により、通電
時の磁束を維持しようと動作するので、平滑コンデンサ
５を充電する向きに起電力を発生する。このときＤＣリ
アクトルに蓄えられたエネルギＥ（＝０．５ＬＩ2 ）
は、ＤＣリアクトル１と平滑コンデンサ５とダイオード
１１からなる閉ループを通る循環電流となって消費され
る。なおＤＣリアクトルに小形化する技術として、ＤＣ
リアクトルに永久磁石を組み込み、コアの磁気利用率を
高めたものがある（特公昭４６−３７１２８号公報）。
このＤＣリアクトルの構成図を図２に示す。リアクトル
コイル電流により生じる直流磁界と逆方向に磁気バイア
スを与える永久磁石を組みこんでいる。本発明の実施例
におけるＤＣリアクトルはどのような構成のものでもよ
いが、特に図２に示すものを使えば、同一定格で比較す
ると従来のＤＣリアクトルよりも小形・軽量にできる。
【０００７】
【発明の効果】以上述べたように、本発明によれば、平
滑コンデンサの充電中に主回路のコンタクタの接点が突
然開いた場合でも、コンタクタの接点間にアーク放電が
発生することを完全に防ぐことができる。したがって、
コンタクタの接点寿命を損なったり、接点が溶解してし
まうという問題を解決できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC intermediate circuit of a forward converter in an inverter device. 2. Description of the Related Art FIG. 3 shows a conventional inverter rectifier circuit. In the figure, reference numeral 1 denotes a DC reactor, which is provided for improving an input current waveform. 2
Is a rush current suppressing resistor, 3 is a contactor, 4 is a rectifier circuit bridge for rectifying a three-phase AC voltage, 5 is a smoothing capacitor,
6 is a contactor control means, 7 is a voltage detection means for measuring the voltage across the smoothing capacitor, 8 is an inverter control means for controlling the inverter section 9 based on an output signal from the voltage detection means 7, and 10 is a diode. Next, the configuration will be described. In a DC intermediate circuit of a forward converter in which a DC reactor and a smoothing capacitor are connected to a DC side of a rectifier circuit bridge 4 connected to an AC power supply, a series connection circuit in which a contactor 3 and a DC reactor 1 are connected in series; Diode 1 installed in the direction to pass charging current to
0 and a series connection circuit in which an inrush current suppression resistor 2 is connected in series, and a parallel connection circuit in which the smoothing capacitor is connected in series between the DC output terminals of the rectifier circuit bridge 4. Next, the operation will be described. The inverter control means 8 detects the voltage V0 on the DC output side of the rectifier circuit bridge 4 and the terminal voltage V1 of the smoothing capacitor 5 by the voltage detecting means 7, and based on the magnitudes of both V0 and V1, the state of charge of the smoothing capacitor 5 Check. V0
When the difference between V1 and V1 is larger than the preset reference value, the inverter control means 8 opens the contactor 3 via the contactor control means 6, and supplies the current from the rectifier circuit bridge 4 to the diode 10 and the inrush current suppressing resistor 2. Through the smoothing capacitor 5. Then V
When the difference between 0 and V1 becomes smaller than the reference value, the inverter control means 8 closes the contactor 3 via the contactor control means 6, short-circuits the inrush current suppressing resistor, and converts the current from the rectifier circuit bridge 4 to DC. The gas is led to the smoothing capacitor 5 through the reactor 1. A control signal is output from the inverter control means 8 to the base (gate) of the main circuit switching element in the inverter section 9. However, in the prior art, when the contact of the contactor 3 is suddenly opened for some reason during charging of the smoothing capacitor 5, the electromagnetic energy stored in the DC reactor causes the contactor 3 to lose its contact potential. There is a problem that an arc discharge occurs between the contacts, which shortens the contact life of the contactor or melts the contact. Therefore, the present invention provides the contactor 3 during charging of the smoothing capacitor 5.
An object of the present invention is to prevent the occurrence of arc discharge between the contacts even when the contacts suddenly open. [0004] In order to solve the above-mentioned problems, the present invention provides a rectifying circuit bridge 4 connected to an AC power supply, and a rectifying circuit bridge 4 having a smoothing capacitor 5 connected to the DC side. An intermediate circuit, a series connection circuit in which a contactor 3 and a DC reactor 1 are connected in series, a series connection circuit in which a diode 10 and a rush current suppression resistor 2 are connected in series so as to pass a charging current to the smoothing capacitor 5; Are connected in parallel with each other and the smoothing capacitor 5 is connected in series between the DC output terminals of the rectifier circuit bridge 4 in a rush current prevention circuit of a voltage source inverter. A connection point is connected to a cathode of the diode 11, and an anode of the diode 11 is connected to a cathode side of the smoothing capacitor .
The DC reactor 1 is generated by a reactor current
A permanent magnet group that applies a magnetic bias in the direction opposite to the DC magnetic field
It is a DC reactor in which the DC reactor is incorporated. According to the above means, if the contact of the contactor 3 is suddenly opened during energization, the electromagnetic energy E (= 0.5 LI 2 joules) stored in the DC reactor 1, L: inductance of the DC reactor, I: Current) is consumed as a circulating current passing through the DC reactor 1, the smoothing capacitor 5, and the diode 11, so that no arc discharge occurs at the contact point of the contactor 3. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration block diagram of the present invention. Regarding the names of the respective parts, the same reference numerals are used for the same names as those in FIG. 3 showing a conventional configuration block diagram, and thus redundant description will be omitted. 11 is a diode. The difference from the conventional configuration is that the cathode side of the diode 11 is connected to the connection point between the contactor 3 and the DC reactor 1 and the anode side of the diode 11 is connected to the negative side of the smoothing capacitor. Next, the operation will be described. In the same manner as in the prior art, the inverter control means 8 detects the state of charge of the smoothing capacitor 5 based on any of the following known techniques (A) to (C) and generates a signal for opening and closing the contactor 3. , And outputs an open / close signal to the contactor control means 6. (A) Voltage detecting means 7 for directly measuring the charging voltage of the smoothing capacitor 5 is used. (A) Current detecting means for directly detecting the charging current of the smoothing capacitor 5 is used. (C) A time measuring means for measuring that a certain time has elapsed since the power was turned on is used. The contactor 3 is driven by the contactor control means 6. When the inverter control means 8 determines that the state of charge of the smoothing capacitor 5 is equal to or less than a predetermined reference value, the contactor 3 is opened to prevent any rush current from flowing through the DC reactor 1. At the moment when the contactor 3 is opened during the energization, the DC reactor 1 operates to maintain the magnetic flux at the time of energization according to the law of electromagnetic induction, so that the electromotive force is generated in the direction to charge the smoothing capacitor 5. At this time, the energy E stored in the DC reactor (= 0.5 LI 2 )
Is consumed as a circulating current passing through a closed loop including the DC reactor 1, the smoothing capacitor 5, and the diode 11. As a technology for miniaturizing the DC reactor, DC
There is a reactor in which a permanent magnet is incorporated in the reactor to increase the magnetic utilization of the core (Japanese Patent Publication No. 46-37128).
FIG. 2 shows a configuration diagram of this DC reactor. It incorporates a permanent magnet that applies a magnetic bias in the direction opposite to the DC magnetic field generated by the reactor coil current. Although the DC reactor in the embodiment of the present invention may have any configuration, especially when the one shown in FIG. 2 is used, it can be made smaller and lighter than the conventional DC reactor when compared at the same rating. As described above, according to the present invention, even if the contact of the contactor of the main circuit is suddenly opened while charging the smoothing capacitor, an arc discharge is generated between the contacts of the contactor. Can be completely prevented. Therefore,
It is possible to solve the problem that the contact life of the contactor is shortened or the contact is melted.
【図面の簡単な説明】
【図１】本発明の構成ブロック図である。
【図２】本発明の実施例で用いる永久磁石を組み込んだ
ＤＣリアクトル。
【図３】従来の構成ブロック図である。
【符号の説明】
１ ＤＣリアクトル
２ 突入電流抑制抵抗
３ コンタクタ
４ 整流回路ブリッジ
５ 平滑コンデンサ
６ コンタクタ制御手段
７ 電圧検出手段
８ インバータ制御手段
９ インバータ部
１０、１１ ダイオードBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration block diagram of the present invention. FIG. 2 shows a DC reactor incorporating a permanent magnet used in an embodiment of the present invention. FIG. 3 is a block diagram of a conventional configuration. [Description of Signs] 1 DC reactor 2 Inrush current suppression resistor 3 Contactor 4 Rectifier circuit bridge 5 Smoothing capacitor 6 Contactor control means 7 Voltage detection means 8 Inverter control means 9 Inverter sections 10, 11 Diode
フロントページの続き (56)参考文献 特開 平７−59358（ＪＰ，Ａ) 特開 昭63−161871（ＪＰ，Ａ) 実開 昭62−191386（ＪＰ，Ｕ) 特公 昭46−37128（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) H02M 7/48 G05F 1/10 H02M 7/06 Continuation of the front page (56) References JP-A-7-59358 (JP, A) JP-A-63-161871 (JP, A) JP-A 62-191386 (JP, U) JP-B-46-37128 (JP, A) , B1) (58) Field surveyed (Int. Cl. 7 , DB name) H02M 7/48 G05F 1/10 H02M 7/06
Claims (1)
４の直流側に平滑コンデンサ５が接続された順変換部の
直流中間回路であって、コンタクタ３とＤＣリアクトル
１を直列接続した直列接続回路と、前記平滑コンデンサ
５へ充電電流を通す向きに取りつけたダイオード１０と
突入電流抑制抵抗２を直列接続した直列接続回路とを互
いに並列接続した並列接続回路と、前記平滑コンデンサ
５とを前記整流回路ブリッジ４の直流出力側端子間に直
列接続した電圧形インバータの突入電流防止回路におい
て、 前記コンタクタ３とＤＣリアクトル１間の接続点とダイ
オード１１のカソードを接続して前記平滑コンデンサの
陰極側に前記ダイオード１１のアノードを接続し、前記
ＤＣリアクトル１が、リアクトル電流により生じる直流
磁界と逆方向に磁気バイアスを与える永久磁石を組み込
んだＤＣリアクトルである電圧形インバータの突入電流
防止回路。 (1) A DC intermediate circuit of a forward converter in which a smoothing capacitor is connected to a DC side of a rectifier circuit bridge connected to an AC power supply. A serial connection circuit in which reactors 1 are connected in series, a parallel connection circuit in which a diode 10 and a series connection circuit in which an inrush current suppressing resistor 2 is connected in series to pass the charging current to the smoothing capacitor 5 are connected in parallel with each other; In a rush current prevention circuit of a voltage source inverter in which the smoothing capacitor 5 is connected in series between DC output terminals of the rectifier circuit bridge 4, a connection point between the contactor 3 and the DC reactor 1 and a cathode of a diode 11 are connected. The anode of the diode 11 is connected to the cathode side of the smoothing capacitor ,
The DC reactor 1 generates a direct current generated by a reactor current.
Incorporates a permanent magnet that gives a magnetic bias in the direction opposite to the magnetic field
Inrush current of voltage type inverter which is DC reactor
Prevention circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12957295A JP3536425B2 (en) | 1995-04-27 | 1995-04-27 | Inrush current prevention circuit for voltage type inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12957295A JP3536425B2 (en) | 1995-04-27 | 1995-04-27 | Inrush current prevention circuit for voltage type inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08308242A JPH08308242A (en) | 1996-11-22 |
| JP3536425B2 true JP3536425B2 (en) | 2004-06-07 |
Family
ID=15012792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12957295A Expired - Fee Related JP3536425B2 (en) | 1995-04-27 | 1995-04-27 | Inrush current prevention circuit for voltage type inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3536425B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007028792A (en) * | 2005-07-15 | 2007-02-01 | Yamatake Corp | converter |
| JP2011010518A (en) * | 2009-06-29 | 2011-01-13 | Mitsubishi Electric Corp | Motor controller of turbocharger |
-
1995
- 1995-04-27 JP JP12957295A patent/JP3536425B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08308242A (en) | 1996-11-22 |
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