JPH03183368A - Inverter circuit - Google Patents
Inverter circuitInfo
- Publication number
- JPH03183368A JPH03183368A JP1323531A JP32353189A JPH03183368A JP H03183368 A JPH03183368 A JP H03183368A JP 1323531 A JP1323531 A JP 1323531A JP 32353189 A JP32353189 A JP 32353189A JP H03183368 A JPH03183368 A JP H03183368A
- Authority
- JP
- Japan
- Prior art keywords
- reactor
- short circuit
- circuit current
- circuit
- circulation
- 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
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 230000001629 suppression Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は電圧型インバータ回路において用いられている
還流ダイオードの逆回復時に発生する電源短絡の状態を
防止するための回路を備えるインバータ回路に関するも
のである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an inverter circuit equipped with a circuit for preventing a power supply short circuit that occurs during reverse recovery of a freewheeling diode used in a voltage-type inverter circuit. It is.
［従来の技術］ 第３図に単相ブリッジの電圧型インバータ回路を示す。[Conventional technology] Figure 3 shows a single-phase bridge voltage type inverter circuit.
図示のように、直流電源１に短絡抑制用リアクトル（直
流リアクトル）２と直流電源１のプラス側にカソード側
を向けて還流ダイオードＤｏが並列に接続される。前記
リアクトル２は電流の上昇率及び電流値を抑制する機能
を有するものである。前記リアクトル２、これと並列な
還流ダイオードＤ。を介し、直流電源１に並列に、順方
向直列にスイッチング素子Ｓｌ、５２よりなるアームと
、Ｓ３．Ｓ４よりなるアームの並列回路が接続され、直
列にあるスイッチング素子５１とＳ２．Ｓ！Ｊと５４と
の接続間に負荷３が接続され、各スイッチング素子Ｓ、
、Ｓ２．Ｓ３．Ｓ４とそれぞれ逆並列に還流ダイオード
Ｄ、、Ｄ２．Ｄ３．Ｄ４が接続される。（ダイオード、
スイッチング素子はいずれも半導体）前記ダイオードＤ
。は短絡抑制用リアクトル２のエネルギーを還流させ、
負荷３から電源１６１１への回生電力の通路として備え
られるものであり、また前記リアクトル２はスイッチン
グ素子Ｓ８とＳ２、又はＳ３とＳ４よりなるアームの短
絡時、短絡電流の電流上昇率を抑える機能をもたせたも
のである。As shown in the figure, a short-circuit suppression reactor (DC reactor) 2 and a freewheeling diode Do are connected in parallel to the DC power supply 1 with the cathode facing the positive side of the DC power supply 1. The reactor 2 has a function of suppressing the current increase rate and current value. The reactor 2 and a free wheel diode D in parallel with the reactor 2. An arm consisting of switching elements Sl, 52 is connected in parallel to the DC power supply 1 in forward series via S3. The parallel circuit of the arm consisting of S4 is connected, and the switching element 51 and S2.S4 are connected in series. S! A load 3 is connected between the connection between J and 54, and each switching element S,
, S2. S3. Freewheeling diodes D, , D2 . D3. D4 is connected. (diode,
(all switching elements are semiconductors) the diode D
. refluxes the energy of the short circuit suppression reactor 2,
The reactor 2 is provided as a path for regenerative power from the load 3 to the power source 1611, and the reactor 2 has a function of suppressing the current increase rate of the short circuit current when the arm consisting of switching elements S8 and S2 or S3 and S4 is short-circuited. It is something that has been maintained.
前記インバータ回路は例えばＰＷＭ制御で運転する。The inverter circuit is operated under PWM control, for example.
負荷３をＬ負荷とした場合、これをＰＷＭ制御で運転す
ると、前記インバータ回路には、第４図（イ）に示すと
おり、還流ダイオードに電流が還流しているモードＡと
（０に示すとおり、Ｌ負荷３のエネルギー回生時の回生
電流が還流ダイオードを流れるモードＢが存在する。When the load 3 is an L load, when it is operated under PWM control, the inverter circuit has modes A and (as shown in 0), in which current flows through the freewheeling diode, as shown in Figure 4 (a). , Mode B exists in which the regenerative current during energy regeneration of the L load 3 flows through the freewheeling diode.
モードＡの場合、Ｓｌがオフし、ＤＩに矢印で示すよう
に還流電流が流れ、Ｄｏにも矢印で示すように還流電流
が流れている。このモードのとき、ｓ２がオフからオン
状態に移行すると、ＤＯＩＤＩは順方向電流が流れてい
たため、ＤＯＩＤＩはその逆回復時間の間、逆阻止能力
を失い、Ｓ２が完全にオン状態となれば、第４図（ハ）
に示すモードＣのとおり、Ｅ−Ｄｏ−Ｊ−５２−Ｅのル
ートで短絡電流Ｉｓが流れる。In the case of mode A, Sl is turned off, a return current flows through DI as shown by the arrow, and a return current also flows through Do as shown by the arrow. In this mode, when s2 transitions from off to on state, DOIDI loses its reverse blocking ability during its reverse recovery time because forward current was flowing through it, and when S2 becomes completely on state, Figure 4 (c)
As shown in mode C, a short circuit current Is flows through the route E-Do-J-52-E.
また、モードＢの場合、ＤＩ＋Ｄ４に矢印で示すように
Ｌ負荷の回生電流が流れている状態でｓ２がオフからオ
ン状態に移行するとＮ ＤＯＩＤＩは順方向電流が流れ
ていたため、ＤＯＩＤＩはその逆回復時間の間、逆阻止
能力を失いＳ２が完全にオン状態となれば（ハ）図のモ
ードＣのとおり、Ｅ−Ｄ、−Ｄ。In addition, in the case of mode B, when s2 transitions from off to on with the regenerative current of the L load flowing as shown by the arrow in DI+D4, the forward current was flowing through N DOIDI, so DOIDI recovers in reverse. If the reverse blocking ability is lost for a period of time and S2 is completely turned on, (c) E-D, -D as in mode C in the figure.
５２−Ｅのルートで短絡電流Ｉｓが流れる。A short circuit current Is flows through the route 52-E.
またモードＢでは、Ｓ３がオフからオンに移行するとき
も同様の理由でＥ−Ｄ、−５３−Ｄ４−Ｅのルートで短
絡電流Ｉｓが流れる。Further, in mode B, when S3 shifts from off to on, short circuit current Is flows through the routes ED and -53-D4-E for the same reason.
［発明が解決しようとする課題］
上記のように短絡電流１ｓが各素子のスイッチングごと
に流れるため、各スイッチング素子のスイッチング損失
が増大し、素子等の冷却能力をアップしなければならな
い。[Problems to be Solved by the Invention] As described above, since the short circuit current 1 s flows every time each element switches, the switching loss of each switching element increases, and the cooling capacity of the elements etc. must be increased.
上記現象はアーム短絡の現象と同現象のため、実際のア
ーム短絡電流との区別がむつかしく、ＤＣＣＴによる保
護が不十分となる。そして、この逆回復時間の間では前
記リアクトル２の効果もない。Since the above phenomenon is the same as the arm short circuit phenomenon, it is difficult to distinguish it from the actual arm short circuit current, resulting in insufficient protection by DCCT. During this reverse recovery time, the reactor 2 has no effect.
［発明の構成コ
本発明は上記課題を解決する目的でなされたもので、前
記還流ダイオードの逆回復時に生じる短絡電流を抑制す
るため、電源とブリッジ接続されたスイッチング回路の
間で直列関係にあり、互に並列関係にある短絡電流抑制
用リアクトル（直流リアクトル）と還流ダイオードより
なる並列回路において、還流ダイオードに直列に可飽和
リアクトルを接続して、前記短絡電流抑制用リアクトル
と並列とした構成を採る。[Structure of the Invention] The present invention has been made for the purpose of solving the above-mentioned problems, and in order to suppress the short-circuit current that occurs during reverse recovery of the freewheeling diode, the power supply and the switching circuit connected in a bridge are connected in series. In a parallel circuit consisting of a short-circuit current suppressing reactor (DC reactor) and a freewheeling diode, which are in a parallel relationship with each other, a saturable reactor is connected in series with the freewheeling diode, and the saturable reactor is connected in parallel with the short-circuit current suppressing reactor. take.
第１図は本発明の実施例を示すが、第３図と同一部分は
同一符号で示す。第３図で示した回路と異なるところは
、直流電源１とブリッジ型に構成されるスイッチング回
路の間で、直列に接続された短絡電流抑制用リアクトル
２に対して、並列に、還流ダイオードＤ。と可飽和リア
クトル４の直列回路が接続されている点である。FIG. 1 shows an embodiment of the present invention, in which the same parts as in FIG. 3 are designated by the same reference numerals. The difference from the circuit shown in FIG. 3 is that between the DC power supply 1 and the bridge-type switching circuit, a freewheeling diode D is connected in parallel to the short-circuit current suppression reactor 2 connected in series. This is the point where the series circuit of the saturable reactor 4 and the saturable reactor 4 are connected.
ここで可飽和リアクトル（以下ＳＬという）は次の機能
を有するものである。Here, the saturable reactor (hereinafter referred to as SL) has the following functions.
第２図（イ）に示すように、可飽和リアクトルＳＬ１
とダイオードＤ。のカソードを直流電源１のプラス側に
向けて直列に接続し、これを短絡電流抑制用リアクトル
２と並列に接続し、この接続他端がスイッチング回路に
接続されている。As shown in Fig. 2 (a), saturable reactor SL1
and diode D. The cathodes of the DC power supply 1 are connected in series with their cathodes facing the positive side of the DC power supply 1, and this is connected in parallel with the short-circuit current suppressing reactor 2, and the other end of this connection is connected to a switching circuit.
直流電源電圧をＥ。し、短絡電流抑制用リアクトルをり
。として、上記ＳＬに次のＶ−を積（Ｎ圧・時間積）を
もたせたものとする。DC power supply voltage is E. and a reactor for short circuit current suppression. Assume that the above SL is multiplied by the following V- (N pressure/time product).
Ｖ −ｔ ＝ Ｅ、−ｔ、 −・・■
ここで、ｔ、はり。、又はＤ Ｉ（Ｄ２〜Ｄ４）の逆回
復時間のうち、短かい方をｔ、−とする。V -t = E, -t, -...■ Here, t, beam. , or the reverse recovery time of DI (D2 to D4), whichever is shorter is t, -.
前記のようなり。、ＤＩ（Ｄ２〜Ｄ４）の逆回復時間の
間の短絡時、ＳＬはりアクドル効果を示し、第２図（ロ
）図で示すように直流電圧Ｅ。は全てＳＬに印加される
。ＳＬで生じる逆起電力をＥｓＬとすると、１
０＜１＜１．の間、 Ｌ８Ｌ ：ＥＯ”Ｅｓｔ
ｔ
１、＜１になれば、ＳＬは前記■よりＬＳＬ＝０（＋１
）となり、第２図（ハ）と等価となる。As above. , during the reverse recovery time of DI (D2-D4), the SL beam exhibits an acdle effect, and the DC voltage E as shown in FIG. are all applied to SL. If the back electromotive force generated at SL is EsL, then 1 0<1<1. During, L8L:EO”Est
If t1, <1, SL becomes LSL=0(+1
), which is equivalent to Fig. 2 (c).
しかし、このとき、すでにＤｏ、またはＤＩ（Ｄ２〜Ｄ
４）は全て逆回復し、逆阻止能力を有しており、ＬＢＬ
＝０でも短絡電流は流れない。However, at this time, Do or DI (D2 to D
4) all have reverse recovery and reverse blocking ability, and LBL
Even if = 0, no short circuit current will flow.
このように、還流ダイオードが、自身に逆電圧が印加さ
れた後に、逆回復し、逆阻止能力をもつまでの間、電源
とダイオードに直列に限流効果をもたせる可飽和リアク
トルを挿入することにより、短絡電流を抑制することが
できる。In this way, by inserting a saturable reactor that has a current limiting effect in series with the power supply and the diode until the freewheeling diode recovers and has reverse blocking ability after a reverse voltage is applied to itself. , short circuit current can be suppressed.
［発明の効果コ
以上説明したように、本発明によれば、インバータ回路
における還流ダイオードの逆回復作用による一時的電源
短絡による短絡電流の上昇率及び電流値を可飽和リアク
トルによって抑制することができる。[Effects of the Invention] As explained above, according to the present invention, it is possible to suppress the increase rate and current value of short circuit current due to a temporary power supply short circuit due to the reverse recovery action of the freewheeling diode in the inverter circuit by using the saturable reactor. .
第１図は本発明の実施例を示す。
第２図（イ）、（ロ）、（ハ）は本発明の動作説明図で
ある。
第３図は従来の単相ブリッジ形の電圧型インバータ回路
を示す。
第４図（イ）、（０）、（ハ）は第３図に示すインバー
タ回路の動作説明図である。
１・・・電源、２・・・短絡電流抑制用リアクトル、３
・・・負荷、４・・・可飽和リアクトル、ＤＯ＋ＤＩ＋
Ｄ２＋Ｄ３＋Ｄ４・・・還流ダイオード、
Ｓ ｌ ＋Ｓ２ 、Ｓ３ 、Ｓ４
・・・半導体スイ
チング素子。FIG. 1 shows an embodiment of the invention. FIGS. 2(a), 2(b), and 2(c) are explanatory diagrams of the operation of the present invention. FIG. 3 shows a conventional single-phase bridge type voltage type inverter circuit. 4(a), (0), and (c) are explanatory diagrams of the operation of the inverter circuit shown in FIG. 3. FIG. 1... Power supply, 2... Short circuit current suppression reactor, 3
...Load, 4...Saturable reactor, DO+DI+
D2+D3+D4...Freewheeling diode, S1+S2, S3, S4...Semiconductor switching element.
Claims (1)
アクトルと並列に、還流ダイオードと可飽和リアクトル
の直列回路を接続し、前記インバータ回路のスイッチン
グ素子と逆並列接続されている還流ダイオード及び前記
短絡電流抑制用リアクトルと並列に接続されている還流
ダイオードの逆回復作用による一時的電源短絡による短
絡電流の上昇率及び電流値抑制を前記可飽和リアクトル
で行うことを特徴とするインバータ回路。(1) A series circuit of a freewheeling diode and a saturable reactor is connected in parallel with the short-circuit current suppression reactor in the voltage type inverter circuit, and the freewheeling diode and the short-circuit current suppression are connected in antiparallel to the switching elements of the inverter circuit. An inverter circuit characterized in that the saturable reactor suppresses the increase rate and current value of a short-circuit current caused by a temporary power supply short circuit caused by a reverse recovery action of a free-wheeling diode connected in parallel with the saturable reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323531A JPH03183368A (en) | 1989-12-12 | 1989-12-12 | Inverter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323531A JPH03183368A (en) | 1989-12-12 | 1989-12-12 | Inverter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03183368A true JPH03183368A (en) | 1991-08-09 |
Family
ID=18155739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1323531A Pending JPH03183368A (en) | 1989-12-12 | 1989-12-12 | Inverter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03183368A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008093429A1 (en) * | 2007-01-30 | 2008-08-07 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Forced commutated inverter apparatus |
| JP2010200401A (en) * | 2009-02-23 | 2010-09-09 | Nissan Motor Co Ltd | Switching circuit |
| JP2016087066A (en) * | 2014-11-04 | 2016-05-23 | 三菱電機株式会社 | Motor drive device, electric blower, and vacuum cleaner |
-
1989
- 1989-12-12 JP JP1323531A patent/JPH03183368A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008093429A1 (en) * | 2007-01-30 | 2008-08-07 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Forced commutated inverter apparatus |
| JP2009512403A (en) * | 2007-01-30 | 2009-03-19 | 三菱電機株式会社 | Self-excited inverter device |
| AU2007345826B2 (en) * | 2007-01-30 | 2010-10-21 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Forced commutated inverter apparatus |
| AU2007345826C1 (en) * | 2007-01-30 | 2011-04-28 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Forced commutated inverter apparatus |
| JP2010200401A (en) * | 2009-02-23 | 2010-09-09 | Nissan Motor Co Ltd | Switching circuit |
| JP2016087066A (en) * | 2014-11-04 | 2016-05-23 | 三菱電機株式会社 | Motor drive device, electric blower, and vacuum cleaner |
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