JPH0660296U - Inverter DC short-circuit detector - Google Patents
Inverter DC short-circuit detectorInfo
- Publication number
- JPH0660296U JPH0660296U JP001528U JP152893U JPH0660296U JP H0660296 U JPH0660296 U JP H0660296U JP 001528 U JP001528 U JP 001528U JP 152893 U JP152893 U JP 152893U JP H0660296 U JPH0660296 U JP H0660296U
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- JP
- Japan
- Prior art keywords
- circuit
- short
- current
- detection
- inverter
- 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.)
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Abstract
(57)【要約】
【目的】 変流器の数が増えても検出設定レベルを低下
させることなく直流短絡を検出する。
【構成】 直流P,Nが共通な複数台のインバータ1
A,1B毎に平滑コンデンサCA,CBを設置し、各コ
ンデンサの配線に夫々変流器CTA,CTBを設け、各
変流器の出力を短絡電流検出回路2に入力して直流短絡
を検出するものにおいて、各変流器CTA,CTBと検
出回路2の間に夫々ダイオードDA,DBを同じ方向に
接続し、各変流器の出力中最大値のみが短絡電流検出回
路2に入力するようになし、最大値を出力しない他の変
流器出力によって検出電流の短絡時と正常時の差が小さ
くなることのないようにして、短絡電流検出回路2の検
出設定レベルを低くすることなく直流短絡を検出する。
(57) [Abstract] [Purpose] Detects a DC short circuit without lowering the detection setting level even if the number of current transformers increases. [Configuration] Multiple inverters 1 with common DC P and N
Smoothing capacitors CA and CB are installed for each of A and 1B, current transformers CTA and CTB are provided in the wiring of each capacitor, and the output of each current transformer is input to the short-circuit current detection circuit 2 to detect a DC short circuit. In this case, the diodes DA and DB are respectively connected in the same direction between the current transformers CTA and CTB and the detection circuit 2 so that only the maximum value of the outputs of the current transformers is input to the short-circuit current detection circuit 2. None, direct current short-circuit without lowering the detection setting level of short-circuit current detection circuit 2 by preventing the difference between the detection current short circuit and the normal state from becoming small by the output of another current transformer that does not output the maximum value. To detect.
Description
【0001】[0001]
本考案は、インバータ装置において、インバータを構成するスイッチング素子 が破損した場合に発生する直流短絡電流を検出するインバータの直流電流短絡検 出装置に関する。 The present invention relates to a DC current short-circuit detecting device for an inverter, which detects a DC short-circuit current generated when a switching element forming the inverter is damaged in the inverter device.
【0002】[0002]
図2について、インバータ装置は、インバータ1の直流側に平滑(電解)コン デンサC1が設置されており、直流電圧の平滑を行っている。Referring to FIG. 2, in the inverter device, a smoothing (electrolytic) capacitor C 1 is installed on the DC side of the inverter 1 to smooth the DC voltage.
【0003】 インバータ1を構成するスイッチング素子TRU〜TRYは同時にONするこ となく交互にON,OFFを行っているが、例えば、素子TRUが破損してON のままとなると素子TRXがONした時に直流短絡が発生する。この場合直流短 絡電流を速やかに検出してインバータ装置を故障停止させる必要がある。The switching elements TRU to TRY forming the inverter 1 are alternately turned on and off without being turned on at the same time. For example, when the element TRU is damaged and remains on, the element TRX is turned on. DC short circuit occurs. In this case, it is necessary to promptly detect the DC short-circuit current and stop the failure of the inverter device.
【0004】 この直流短絡電流の検出は、電解コンデンサC1の配線部分に交流用の変流器 CT1を設置してこれに検出レベルが設定された短絡電流検出回路2を接続して 行っている。The detection of this DC short-circuit current is carried out by installing a current transformer CT1 for AC in the wiring portion of the electrolytic capacitor C 1 and connecting it to a short-circuit current detection circuit 2 having a detection level set. .
【0005】 インバータ装置の構成上、図3(a)に示すように複数のインバータ1A,1 B毎に平滑コンデンサCA,CBが分割して設置されている場合は、変流器CT A,CTBを各コンデンサCA,CBの配線部分に設置し、各変流器の出力を短 絡検出回路2に入力して直流短絡を検出している。Due to the configuration of the inverter device, when the smoothing capacitors CA and CB are separately installed for each of the plurality of inverters 1A and 1B as shown in FIG. 3A, the current transformers CT A and CTB are provided. Is installed in the wiring portion of each capacitor CA, CB, and the output of each current transformer is input to the short-circuit detection circuit 2 to detect a DC short circuit.
【0006】 また、図3(b)に示すようにインバータの1相毎に平滑コンデンサC1,C2 が分割設置されている場合も同様に平滑コンデンサC1,CBの配線部分に変流 器CT1,CT2を設置して直流短絡を検出している。Further, as shown in FIG. 3B, when the smoothing capacitors C 1 and C 2 are separately installed for each phase of the inverter, the current transformers are similarly connected to the wiring portions of the smoothing capacitors C 1 and CB. CT1 and CT2 are installed to detect a DC short circuit.
【0007】[0007]
上記従来図2(a)の回路の場合、検出電流はIA+IB(IA,IBは正常 時にコンデンサCA,CBに流れる交流電流)となる。 In the case of the conventional circuit of FIG. 2 (a), the detected current is IA + IB (IA and IB are alternating currents flowing through the capacitors CA and CB when normal).
【0008】 ここでインバータ1Aに直流短絡が発生したとすると、短絡電流は短時間的に は、コンデンサCA及びCBとインバータ1A間の配線インピーダンスの差によ り、コンデンサCAからの電流≫コンデンサCBから廻り込む電流となる。If a DC short circuit occurs in the inverter 1A, the short-circuit current is short-circuited in a short time due to the difference in wiring impedance between the capacitors CA and CB and the inverter 1A >> the current from the capacitor CA >> the capacitor CB. It becomes the electric current flowing from.
【0009】 短絡電流がK・IA(Kは係数)であったとすると、短絡電流検出回路2での 検出電流はK・IA+IBとなる。正常時の電流IA=IBとすると、K・IA +IB=(K+1)IAである。Assuming that the short-circuit current is K · IA (K is a coefficient), the detected current in the short-circuit current detection circuit 2 is K · IA + IB. If the normal current IA = IB, then K · IA + IB = (K + 1) IA.
【0010】 同様に、分割して設置される電解コンデンサの数をNとすると、正常時の検出 電流はN・IA,短絡時の検出電流は(K+N−1)IAとなる。Similarly, when the number of divided electrolytic capacitors is N, the normal detection current is N · IA and the short-circuit detection current is (K + N−1) IA.
【0011】 例えば、K=5とすると、表1のようになる。For example, when K = 5, Table 1 is obtained.
【0012】[0012]
【表1】 [Table 1]
【0013】 このように電解コンデンサを分割する数(=変流器の数)Nが増えるに従って 短絡時と正常時の検出電流の差が小さくなってくる。即ち、Nが増えるに従って 短絡電流検出回路2の検出設定レベルが正常時のレベルに近づくため安定な直流 短絡検出動作が期待できなくなる(図3(b)の回路の場合も同じ)。As described above, as the number of divided electrolytic capacitors (= the number of current transformers) N increases, the difference between the detected currents at the time of a short circuit and at the time of normal operation becomes smaller. That is, as N increases, the detection setting level of the short-circuit current detection circuit 2 approaches the normal level, and stable DC short-circuit detection operation cannot be expected (the same applies to the circuit of FIG. 3B).
【0014】 本考案は、従来のこのような問題点に鑑みてなされたものであり、その目的と するところは、変流器の数が増えても検出設定レベルを低下させることなく直流 短絡を検出することができるインバータの直流短絡検出装置を提供することにあ る。The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to prevent a DC short circuit without lowering the detection setting level even if the number of current transformers increases. Another object of the present invention is to provide a DC short-circuit detection device for an inverter that can detect it.
【0015】[0015]
上記目的を達成するために、本考案におけるインピーダンスの直流短絡検出装 置は、 直流が共通な複数台のインバータ毎に或はインバータの1相毎に平滑コンデン サを設置し、この各平滑コンデンサの配線に夫々変流器を設け、各変流器の出力 を短絡電流検出回路に入力して直流短絡を検出するものにおいて、前記各変流器 と短絡電流検出回路の間に夫々ダイオードを同じ方向に接続してなるものである 。 In order to achieve the above object, the impedance DC short-circuit detection device according to the present invention is provided with a smoothing capacitor for each of a plurality of inverters having a common DC or for each phase of the inverter, and the smoothing capacitor of each smoothing capacitor is installed. In the case where each current transformer is provided in the wiring and the output of each current transformer is input to the short-circuit current detection circuit to detect a DC short circuit, a diode is connected in the same direction between each current transformer and the short-circuit current detection circuit. It is connected to.
【0016】[0016]
各変流器は夫々各平滑コンデンサに流れる電流を検出する。直流短絡が発生す ると配線インピーダンスの違いにより直流短絡が発生したインバータ或はインバ ータの相の変流器出力が増加する。各変流器と短絡電流検出回路間には夫々ダイ オードが同じ方向に接続されているので、各変流器の出力中の最大値のみが短絡 電流検出回路に入力し、それ以外の変流器の出力は短絡電流検出回路に入力しな い。 Each current transformer detects the current flowing through each smoothing capacitor. When a DC short circuit occurs, the output of the current transformer of the inverter or inverter phase where the DC short circuit occurs due to the difference in wiring impedance increases. Since the diodes are connected in the same direction between each current transformer and the short-circuit current detection circuit, only the maximum value in the output of each current transformer is input to the short-circuit current detection circuit, and the other current Do not input the output of the instrument to the short circuit current detection circuit.
【0017】 そのため、短絡電流検出回路に入力する検出電流の短絡時と正常時の差が、最 大値を出力しない変流器の出力によって小さくなることがない。従って短絡電流 検出回路の検出設定レベルを低くすることなく直流短絡の検出が可能となる。Therefore, the difference between the detected current input to the short-circuit current detection circuit at the time of the short circuit and the normal state is not reduced by the output of the current transformer that does not output the maximum value. Therefore, it is possible to detect a DC short circuit without lowering the detection setting level of the short circuit current detection circuit.
【0018】[0018]
【実施例】 本考案の実施例を図面を参照して説明する。Embodiments of the present invention will be described with reference to the drawings.
【0019】 図1において、1A,1Bはインバータ、CA,CBはインバータ1A,1B の直流側に接続された平滑(電解)コンデンサ、CTA,CTBは平滑コンデン サCA,CBに流れる電流を検出する変流器、RA,RBは変流器CTA,CT Bの2次側に接続された抵抗、2は変流器CTA,CTBの出力側にダイオード DA,DBを介して接続された短絡電流検出回路である。In FIG. 1, 1A and 1B are inverters, CA and CB are smoothing (electrolytic) capacitors connected to the DC side of the inverters 1A and 1B, and CTA and CTB are currents flowing through the smoothing capacitors CA and CB. Current transformers RA, RB are resistors connected to the secondary side of the current transformers CTA, CT B, 2 is a short-circuit current detection connected to the output side of the current transformers CTA, CTB via diodes DA, DB Circuit.
【0020】 以上のように、各変流器CTA,CTBと短絡検出回路2間にダイオードDA ,DBが接続されているので、短絡電流検出回路2には各変流器CTA,CTB の中で最大の電流が流れている変流器例えばCTAの出力のみが入力し、この変 流器CTA以外の変流器CTBの出力は入らない。As described above, since the diodes DA and DB are connected between the current transformers CTA and CTB and the short-circuit detection circuit 2, the short-circuit current detection circuit 2 includes the current transformers CTA and CTB. Only the output of the current transformer, such as CTA, in which the maximum current is flowing is input, and the output of the current transformer CTB other than this current transformer CTA is not input.
【0021】 このためインバータ1Aに直流短絡が発生した場合、変流器CTBの出力の影 響を受けることなく直流短絡電流K・IA(IAは通常時の電池、Kは係数)の 検出ができる。Therefore, when a DC short circuit occurs in the inverter 1A, the DC short circuit current K · IA (IA is a normal battery, K is a coefficient) can be detected without being affected by the output of the current transformer CTB. .
【0022】 上記実施例は平滑コンデンサの数Nが2の場合であるがこのNが3以上となっ た場合も同様に直流短絡電流を最大の電流が流れている変流器の出力のみが短絡 電流検出回路2に入力するので、平滑コンデンサの数(=変流器の数)Nが増え ても短絡時と正常時の検出の差が小さくなることはない。In the above embodiment, the number N of smoothing capacitors is 2. However, when the number N is 3 or more, only the output of the current transformer in which the maximum DC short-circuit current flows is short-circuited as well. Since the current is input to the current detection circuit 2, even if the number of smoothing capacitors (= the number of current transformers) N increases, the difference between the detection at the time of short circuit and the detection at the time of normal does not become small.
【0023】 このため短絡電流検出回路2における検出設定レベルを正常時のレベルより十 分大きくとって直流短絡を確実に検出することが可能となる。Therefore, it becomes possible to reliably detect a DC short circuit by setting the detection setting level in the short-circuit current detection circuit 2 to be sufficiently higher than the normal level.
【0024】 なお、上記実施例はインバータの数が複数の場合であるが、従来図3(b)に 示すようにインバータの1相毎に電解コンデンサを設けた場合においても各変流 器と短絡電流検出回路の間に夫々ダイオードを接続することにより、同様に直流 短絡を検出できることはいうまでもない。In the above embodiment, the number of inverters is plural, but even when an electrolytic capacitor is provided for each phase of the inverter as shown in FIG. 3B, it is short-circuited with each current transformer. It goes without saying that a DC short circuit can be similarly detected by connecting diodes between the current detection circuits.
【0025】[0025]
本考案は、上述のとおり構成されているので、次に記載する効果を奏する。 Since the present invention is configured as described above, it has the following effects.
【0026】 (1)分割して設置された各平滑コンデンサの電流を検出する各変流器のうちの 最大電流が流れている変流器の出力のみを取り出して直流短絡の検出を行ってい るので、検出レベルを低くすることなく確実に直流短絡を検出することができる 。(1) The DC short circuit is detected by extracting only the output of the current transformer with the maximum current flowing out of the current transformers that detect the currents of the smoothing capacitors installed separately. Therefore, a DC short circuit can be reliably detected without lowering the detection level.
【0027】 (2)従来の各変流器と短絡検出回路との間に夫々ダイオードを接続しただけで あるので、構成が簡単である。(2) The configuration is simple because diodes are simply connected between each conventional current transformer and the short-circuit detection circuit.
【図1】本考案の実施例を示す回路図。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図2】従来インバータの直流短絡検出装置を示す回路
図。FIG. 2 is a circuit diagram showing a DC short-circuit detecting device for a conventional inverter.
【図3】従来平滑コンデンサが分割設置されているイン
バータの直流短絡検出装置を示す回路図。FIG. 3 is a circuit diagram showing a conventional DC short-circuit detection device for an inverter in which smoothing capacitors are separately installed.
1,1A,1B…インバータ 2…短絡電流検出回路 C1,C2,CA,CB…平滑コンデンサ CT1,CT2,CTA,CTB…変流器 DA,DB…ダイオード TRU〜TRY…スイッチング素子1, 1A, 1B ... inverter 2 ... short-circuit current detecting circuit C 1, C 2, CA, CB ... smoothing capacitor CT1, CT2, CTA, CTB ... current transformer DA, DB ... diode TRU~TRY ... switching element
Claims (1)
はインバータの1相毎に平滑コンデンサを設置し、この
各平滑コンデンサの配線に夫々変流器を設け、各変流器
の出力を短絡電流検出回路に入力して直流短絡を検出す
るものにおいて、 前記各変流器と短絡電流検出回路の間に夫々ダイオード
を同じ方向に接続し、短絡電流検出回路が各変流器の出
力中の最大値のみを検出するようにしたことを特徴とし
たインバータの直流短絡検出装置。1. A smoothing capacitor is provided for each of a plurality of inverters having a common direct current or for each phase of the inverter, and a current transformer is provided for each smoothing capacitor wiring, and an output of each current transformer is provided. In the one for detecting a DC short circuit by inputting to the short-circuit current detection circuit, each diode is connected in the same direction between each of the current transformers and the short-circuit current detection circuit, and the short-circuit current detection circuit outputs the current of each current transformer. A DC short-circuit detection device for an inverter, characterized in that it detects only the maximum value of.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1993001528U JP2597025Y2 (en) | 1993-01-26 | 1993-01-26 | Inverter DC short circuit detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1993001528U JP2597025Y2 (en) | 1993-01-26 | 1993-01-26 | Inverter DC short circuit detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0660296U true JPH0660296U (en) | 1994-08-19 |
JP2597025Y2 JP2597025Y2 (en) | 1999-06-28 |
Family
ID=11504021
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Application Number | Title | Priority Date | Filing Date |
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JP1993001528U Expired - Fee Related JP2597025Y2 (en) | 1993-01-26 | 1993-01-26 | Inverter DC short circuit detection device |
Country Status (1)
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JP (1) | JP2597025Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002051569A (en) * | 2000-08-03 | 2002-02-15 | Toshiba Corp | Power converter |
-
1993
- 1993-01-26 JP JP1993001528U patent/JP2597025Y2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002051569A (en) * | 2000-08-03 | 2002-02-15 | Toshiba Corp | Power converter |
JP4530499B2 (en) * | 2000-08-03 | 2010-08-25 | 東芝エレベータ株式会社 | Power converter |
Also Published As
Publication number | Publication date |
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JP2597025Y2 (en) | 1999-06-28 |
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