JPH10178779A - Overvoltage preventive circuit in step-down converter - Google Patents
Overvoltage preventive circuit in step-down converterInfo
- Publication number
- JPH10178779A JPH10178779A JP8353722A JP35372296A JPH10178779A JP H10178779 A JPH10178779 A JP H10178779A JP 8353722 A JP8353722 A JP 8353722A JP 35372296 A JP35372296 A JP 35372296A JP H10178779 A JPH10178779 A JP H10178779A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- converter
- circuit
- input
- down converter
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Rectifiers (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、降圧形コンバータ
に接続される機器の保護回路に関する。The present invention relates to a protection circuit for a device connected to a step-down converter.
【０００２】[0002]
【従来の技術】降圧形コンバータは入力側の高電圧を低
下させ低電圧として出力し、該低電圧を該降圧形コンバ
ータに接続される機器に供給するものとして利用され
る。2. Description of the Related Art A step-down converter is used for reducing a high voltage on an input side and outputting the low voltage as a low voltage, and supplying the low voltage to equipment connected to the step-down converter.
【０００３】例えば、工作機械の送り軸を駆動する送り
軸モータの駆動装置にあっては、交流の３相商用電源を
降圧形コンバータと、この変換された直流電圧を可変電
圧、可変周波数の交流に変換するインバータを備え、こ
れによって駆動対象であるモータに対して安定な回転制
御を行なっている。For example, in a drive device of a feed shaft motor for driving a feed shaft of a machine tool, an AC three-phase commercial power supply is a step-down converter, and the converted DC voltage is a variable voltage and a variable frequency AC. An inverter is provided to convert the motor into a stable motor, thereby performing stable rotation control on the motor to be driven.
【０００４】一般に装置や部品等の電気機器は定格を超
える過大な電圧が印加されると機器の破損を引き起こ
す。通常ＡＣ２００Ｖ入力のコンバータは３相ダイオー
ドブリッジ回路を用いられたものが多く、その直流電圧
を利用する機器は、４５０Ｖ〜６００Ｖの最大電圧定格
である。そのため、過電圧検出レベルを４００Ｖに設定
すれば、通常動作においてアラームが発生することも、
ましてや機器の部品を破損させることもない。例えば、
モータ減速時のエネルギーの電源回生能力不足や外来サ
ージによって直流電圧部分が充電された結果、過電圧ア
ラーム発生レベルに達するような場合でも、電圧は徐々
に増加するため、過電圧を検出し数十ｍｓｅｃ後に入力
電源を電磁接触器で切断する方式で十分に装置や部品等
の機器を保護することができる。[0004] Generally, when an excessive voltage exceeding the rating is applied to electric equipment such as devices and parts, the equipment is damaged. Usually, a converter with a 200 V AC input uses a three-phase diode bridge circuit in many cases, and a device using the DC voltage has a maximum voltage rating of 450 V to 600 V. Therefore, if the overvoltage detection level is set to 400 V, an alarm may occur in normal operation,
Moreover, the components of the device are not damaged. For example,
Even if the DC voltage portion is charged due to insufficient power regenerative capacity of energy during motor deceleration or external surge, the voltage gradually increases even if the overvoltage alarm occurrence level is reached. The system in which the input power is cut off by the electromagnetic contactor can sufficiently protect the device such as the device and the component.
【０００５】[0005]
【発明が解決しようとする課題】一方、欧米のように、
商用入力電圧が高く（例えばＡＣ４６０Ｖ）、これを位
相角制御等を用いたコンバータで降圧するような場合、
例えば、ＡＣ入力電圧が４６０ＶでＤＣ３００Ｖに降圧
するコンバータを用い、該コンバータに上述した電圧定
格が４５０Ｖ〜６００ＶのＡＣ２００Ｖ系の機器（イン
バータ）を接続し使用する場合には、上述したような不
具合によって入力の高い電圧６５０Ｖ（４６０Ｖａｃ×
（２）1/2 ）が瞬時の内に低圧部分の機器（インバー
タ）に印加される恐れがある。On the other hand, as in Europe and the United States,
When the commercial input voltage is high (for example, AC460V) and this is stepped down by a converter using phase angle control or the like,
For example, when using a converter that has an AC input voltage of 460 V and steps down to DC 300 V, and connects and uses a 200 V AC device (inverter) with a voltage rating of 450 V to 600 V to the converter, the above-described problem may occur. High input voltage 650V (460Vac ×
(2) 1/2 ) may be applied to the device (inverter) in the low voltage portion within a moment.
【０００６】このような場合、従来のように電圧検出を
行ない電磁接触器で入力を遮断する方式を用いると、最
低数十ｍｓｅｃ間高い電圧がコンバータに接続された機
器（インバータ等）に印加されることになり、機器（イ
ンバータ等）の保護が困難である。またこの対策とし
て、低圧部分の機器（インバータ）を構成する部品の耐
圧を上げるようにすると、コストが高くなるという問題
がある。そこで、本発明の目的は、簡単で低コストで低
圧部分の機器を保護できる降圧形コンバータにおける過
電圧保護回路を提供することにある。In such a case, if a conventional method of detecting a voltage and interrupting the input with an electromagnetic contactor is used, a high voltage is applied to equipment (such as an inverter) connected to the converter for at least several tens of msec. Therefore, it is difficult to protect devices (such as an inverter). As a countermeasure against this, there is a problem that if the withstand voltage of the components constituting the device (inverter) of the low voltage portion is increased, the cost increases. SUMMARY OF THE INVENTION It is an object of the present invention to provide an overvoltage protection circuit in a step-down converter that can protect a low-voltage part device simply and at low cost.
【０００７】[0007]
【課題を解決するための手段】本発明は、降圧形コンバ
ータの出力側電圧を検出する電圧検出回路と、該出力側
を短絡する短絡回路とを設け、上記電圧検出回路が過電
圧として設定された電圧以上の電圧を検出すると、上記
短絡回路を作動させて該出力側を短絡し、入力側に設け
られた保護継電器を作動させ入力を遮断させるようにし
た。According to the present invention, there is provided a voltage detecting circuit for detecting an output side voltage of a step-down converter, and a short circuit for short-circuiting the output side, wherein the voltage detecting circuit is set as an overvoltage. When a voltage higher than the voltage is detected, the short circuit is activated to short-circuit the output side, and a protective relay provided on the input side is activated to shut off the input.
【０００８】[0008]
【発明の実施の形態】図１は、位相角制御方式サイリス
タブリッジ降圧コンバータに本発明を適用した一実施形
態の要部回路図である。この実施形態では、該コンバー
タをインバータに接続しインバータによってモータを回
転駆動制御する例を示している。FIG. 1 is a main part circuit diagram of an embodiment in which the present invention is applied to a phase angle control type thyristor bridge step-down converter. In this embodiment, an example in which the converter is connected to an inverter and the motor is rotationally controlled by the inverter is shown.
【０００９】サイリスタ（以下ＳＣＲという）１のアノ
ードはＳＣＲ２のカソードに接続され、ＳＣＲ１のカソ
ードは一方の出力端子１４に、ＳＣＲ２のアノードは他
方の出力端子１５に接続されている。同様に、ＳＣＲ
３、ＳＣＲ５のアノードとＳＣＲ４、ＳＣＲ６のカソー
ドがそれぞれ接続され、ＳＣＲ３、ＳＣＲ５のカソード
は一方の出力端子１４に接続され、ＳＣＲ４、ＳＣＲ６
のカソードは他方の出力端子１５に接続されている。交
流の商用３相電源のＲ相、Ｓ相、Ｔ相はそれぞれ保護継
電器としてのヒューズ９Ｒ，９Ｓ，９Ｔを介してＳＣＲ
１とＳＣＲ２、ＳＣＲ３とＳＣＲ４、ＳＣＲ５とＳＣＲ
６の接続点にそれぞれ接続されている。また、両出力端
子１４，１５間には平滑コンデンサ８が接続されてい
る。なお、ＳＣＲ１〜ＳＣＲ６の各ゲートとサイリスタ
点弧制御回路１１は接続されているが図１では省略して
いる。The anode of the thyristor (hereinafter referred to as SCR) 1 is connected to the cathode of SCR 2, the cathode of SCR 1 is connected to one output terminal 14, and the anode of SCR 2 is connected to the other output terminal 15. Similarly, SCR
3, the anodes of SCR5 and the cathodes of SCR4 and SCR6 are connected respectively, and the cathodes of SCR3 and SCR5 are connected to one output terminal 14, and SCR4 and SCR6 are connected.
Is connected to the other output terminal 15. The R, S, and T phases of the AC commercial three-phase power supply are respectively connected to the SCR via fuses 9R, 9S, and 9T as protective relays.
1 and SCR2, SCR3 and SCR4, SCR5 and SCR
6 connection points. A smoothing capacitor 8 is connected between the output terminals 14 and 15. The gates of SCR1 to SCR6 and the thyristor firing control circuit 11 are connected, but are omitted in FIG.
【００１０】以上の構成が、位相角制御方式サイリスタ
ブリッジ降圧コンバータの構成であるが、さらに、本実
施形態では、両出力端子１４，１５間に出力端子間の電
圧を検出する電圧検出回路１０が接続され、さらに短絡
回路を形成するＳＣＲ７のアノードが出力端子１４にカ
ソードが出力端子１５に接続されている。また、上記電
圧検出回路１０の出力はサイリスタ点弧回路１１に接続
され、該サイリスタ点弧回路１１はＳＣＲ７のゲートに
接続され、該ＳＣＲ７を点弧できるようになっている。The above configuration is the configuration of the thyristor bridge step-down converter of the phase angle control type. In this embodiment, the voltage detection circuit 10 for detecting the voltage between the output terminals 14 and 15 is provided. The anode of the SCR 7 that is connected and forms a short circuit is connected to the output terminal 14 and the cathode of the SCR 7 is connected to the output terminal 15. The output of the voltage detection circuit 10 is connected to a thyristor firing circuit 11, which is connected to the gate of the SCR 7 so that the SCR 7 can be fired.
【００１１】なお、上記降圧形コンバータの構成は従来
の位相角制御方式サイリスタブリッジ降圧コンバータの
構成と同一であるが、ＳＣＲ７、電圧検出回路１０及び
サイリスタ点弧回路１１によってＳＣＲ７を点弧できる
ようにした点が従来と異なる。また、コンバータの出力
端子１４，１５はインバータ１２の入力端子に接続さ
れ、インバータ１２の出力はモータの各相の端子に接続
されている。The configuration of the above-mentioned step-down converter is the same as that of the conventional thyristor bridge step-down converter of the phase angle control type, except that the SCR 7, the voltage detection circuit 10 and the thyristor firing circuit 11 can fire the SCR 7. Is different from the past. The output terminals 14 and 15 of the converter are connected to the input terminals of the inverter 12, and the output of the inverter 12 is connected to the terminals of each phase of the motor.
【００１２】コンバータの入力端子にＲ，Ｓ，Ｔ相の３
相交流電源が接続され、従来と同様にＳＣＲ１〜ＳＣＲ
６の点弧を制御してＳＣＲ１〜６で整流し位相角制御を
行なって所定の直流電圧を両端子１４，１５間に出力す
る。例えば、三相入力電圧が４６０Ｖで、位相角制御に
より出力する直流電圧が３００Ｖに制御している場合
に、入力のＳＣＲ１〜ＳＣＲ６が誤点弧すると、最大６
５０Ｖ（交流４６０Ｖのピーク値）の電圧がコンバータ
から出力されインバータ１２に印加されることになる。The R, S, and T phase 3 terminals are connected to the input terminal of the converter.
Phase AC power supply is connected and SCR1 to SCR
Then, the ignition of No. 6 is controlled, rectified by the SCRs 1 to 6 and the phase angle is controlled to output a predetermined DC voltage between the terminals 14 and 15. For example, when the three-phase input voltage is 460 V and the DC voltage output by the phase angle control is controlled to 300 V, when the input SCR1 to SCR6 are erroneously fired, a maximum of 6
A voltage of 50 V (peak value of AC 460 V) is output from the converter and applied to the inverter 12.
【００１３】そこで、この過電圧からインバータ（低圧
回路）の各部品（スイッチング素子等）を保護するため
に、本発明においては、上記コンバータの出力電圧を電
圧検出回路１０で検出し、設定電圧（例えば４００Ｖ）
以上になると、出力信号をサイリスタ点弧回路１１に出
力し、サイリスタ点弧回路１１は、この信号を受けてＳ
ＣＲ７のゲートにゲート電流を流し、該ＳＣＲ７を導通
させ、コンバータの出力端子を短絡する。その結果、そ
の時導通しているＳＣＲ１〜ＳＣＲ６を介して過大電流
が流れヒューズ９Ｒ〜９Ｔのいずれかを溶断する。Therefore, in order to protect each component (switching element and the like) of the inverter (low-voltage circuit) from this overvoltage, in the present invention, the output voltage of the converter is detected by the voltage detection circuit 10 and the set voltage (for example, 400V)
At this point, an output signal is output to the thyristor firing circuit 11, and the thyristor firing circuit 11 receives this signal,
A gate current is passed through the gate of CR7, the SCR7 is turned on, and the output terminal of the converter is short-circuited. As a result, an excessive current flows through the SCR1 to SCR6 which are conducting at that time, and blows any one of the fuses 9R to 9T.
【００１４】例えば、ＳＣＲ１とＳＣＲ６が導通してい
るときに、異常電圧が検出されＳＣＲ７が導通すると、
ＳＣＲ１、ＳＣＲ７、ＳＣＲ６を介してＲ相とＴ相の入
力端子が短絡されることになり、ヒューズ９Ｒ，９Ｔが
溶断されることになり過電圧がインバータ（低圧回路）
に印加されるのを防止する。なお、コンバータの出力を
短絡させる素子としては、ＳＣＲ７以外のトランジスタ
やＩＧＢＴ（絶縁ゲートバイポーラ形トランジスタ）、
ＧＴＯ（ゲートターンオフサイリスタ）等のパワースイ
ッチング素子を用いてもよい。For example, if an abnormal voltage is detected and the SCR 7 becomes conductive while the SCR 1 and SCR 6 are conducting,
The input terminals of the R phase and the T phase are short-circuited via the SCR1, SCR7 and SCR6, the fuses 9R and 9T are blown, and an overvoltage occurs in the inverter (low voltage circuit).
To be applied. Note that, as an element for short-circuiting the output of the converter, a transistor other than SCR7, an IGBT (insulated gate bipolar transistor),
A power switching element such as a GTO (gate turn-off thyristor) may be used.
【００１５】[0015]
【発明の効果】本発明においては、過電圧がコンバータ
から出力された場合、即時にコンバータの入力を遮断す
るので、コンバータの出力側に接続された低電圧系のイ
ンバータ等の機器の破壊を防止することができる。According to the present invention, when an overvoltage is output from the converter, the input of the converter is immediately cut off, thereby preventing the destruction of equipment such as a low-voltage inverter connected to the output side of the converter. be able to.
【図１】本発明の一実施形態の要部回路図である。FIG. 1 is a main part circuit diagram of one embodiment of the present invention.
１〜７ サイリスタ（ＳＣＲ） ８ コンデンサ ９Ｒ，９Ｓ，９Ｔ ヒューズ １４，１５ 出力端子 1-7 Thyristor (SCR) 8 Capacitor 9R, 9S, 9T Fuse 14, 15 Output terminal
Claims (1)
る電圧検出回路と、該出力側を短絡する短絡回路とを設
け、上記電圧検出回路が過電圧として設定された電圧以
上の電圧を検出すると、上記短絡回路を作動させて該出
力側を短絡し、入力側に設けられた保護継電器を作動さ
せ入力を遮断させる降圧形コンバータにおける過電圧保
護回路。A voltage detecting circuit for detecting an output side voltage of the step-down converter; and a short circuit for short-circuiting the output side. When the voltage detecting circuit detects a voltage higher than a voltage set as an overvoltage, An overvoltage protection circuit in a step-down converter that activates the short circuit to short-circuit the output side and activates a protection relay provided on the input side to cut off the input.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8353722A JPH10178779A (en) | 1996-12-18 | 1996-12-18 | Overvoltage preventive circuit in step-down converter |
| PCT/JP1997/004685 WO1998027641A1 (en) | 1996-12-18 | 1997-12-18 | Overvoltage protective circuit for step-down converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8353722A JPH10178779A (en) | 1996-12-18 | 1996-12-18 | Overvoltage preventive circuit in step-down converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10178779A true JPH10178779A (en) | 1998-06-30 |
Family
ID=18432783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8353722A Pending JPH10178779A (en) | 1996-12-18 | 1996-12-18 | Overvoltage preventive circuit in step-down converter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH10178779A (en) |
| WO (1) | WO1998027641A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1239573A1 (en) * | 2001-03-05 | 2002-09-11 | Fujitsu Limited | Overvoltage-protective device for power system, AC/DC converter and DC/DC converter constituting the power system |
| JP2007236108A (en) * | 2006-03-01 | 2007-09-13 | Toshiba Corp | Superconducting current limiting device and power system |
| JP2009268347A (en) * | 2008-04-21 | 2009-11-12 | Aeg Power Solutions Bv | Circuit which protects at least one dc network having dc load from excess voltage |
| EP2378656A1 (en) * | 2009-01-14 | 2011-10-19 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Protection circuit used in wind power generation system including double-fed induction generator |
| JP2019009915A (en) * | 2017-06-26 | 2019-01-17 | 東芝三菱電機産業システム株式会社 | Voltage abnormality detection device |
| JP6513293B1 (en) * | 2017-12-15 | 2019-05-15 | 三菱電機株式会社 | Motor drive system and inverter device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5122701B2 (en) * | 1998-04-27 | 2013-01-16 | ザ ダウ ケミカル カンパニー | On-demand curing adhesive and window module having on-demand adhesive thereon |
| GB0311013D0 (en) | 2003-05-13 | 2003-06-18 | Newage Int Ltd | An electrical power generating system and a permanent magnet generator for such a system |
| EP2065993B1 (en) * | 2007-11-28 | 2016-09-28 | Siemens Schweiz AG | Voltage transformer assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5510343U (en) * | 1978-07-03 | 1980-01-23 | ||
| JPH02179219A (en) * | 1988-12-28 | 1990-07-12 | Canon Inc | Power supply device |
-
1996
- 1996-12-18 JP JP8353722A patent/JPH10178779A/en active Pending
-
1997
- 1997-12-18 WO PCT/JP1997/004685 patent/WO1998027641A1/en active Application Filing
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1239573A1 (en) * | 2001-03-05 | 2002-09-11 | Fujitsu Limited | Overvoltage-protective device for power system, AC/DC converter and DC/DC converter constituting the power system |
| US6674657B2 (en) | 2001-03-05 | 2004-01-06 | Fujitsu Limited | Overvoltage-protective device for power system, AC/DC converter and DC/DC converter constituting the power system |
| JP2007236108A (en) * | 2006-03-01 | 2007-09-13 | Toshiba Corp | Superconducting current limiting device and power system |
| JP2009268347A (en) * | 2008-04-21 | 2009-11-12 | Aeg Power Solutions Bv | Circuit which protects at least one dc network having dc load from excess voltage |
| EP2378656A1 (en) * | 2009-01-14 | 2011-10-19 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Protection circuit used in wind power generation system including double-fed induction generator |
| EP2378656B1 (en) * | 2009-01-14 | 2018-04-04 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Protection circuit used in wind power generation system including double-fed induction generator |
| JP2019009915A (en) * | 2017-06-26 | 2019-01-17 | 東芝三菱電機産業システム株式会社 | Voltage abnormality detection device |
| JP6513293B1 (en) * | 2017-12-15 | 2019-05-15 | 三菱電機株式会社 | Motor drive system and inverter device |
| WO2019116551A1 (en) * | 2017-12-15 | 2019-06-20 | 三菱電機株式会社 | Motor drive system and inverter device |
| CN111466076A (en) * | 2017-12-15 | 2020-07-28 | 三菱电机株式会社 | Motor drive system and inverter device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998027641A1 (en) | 1998-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR940008951A (en) | Electric vehicle controller | |
| WO2021210124A1 (en) | Power delivery system for moving body | |
| US4745513A (en) | Protection of GTO converters by emitter switching | |
| CN110073592B (en) | Protection device for an electric drive system, electric drive system and method for operating an electric drive system | |
| JPH10178779A (en) | Overvoltage preventive circuit in step-down converter | |
| CA1070757A (en) | Field overvoltage protecting apparatus for synchronous machine | |
| JP2005051901A (en) | Power converter | |
| JP4955363B2 (en) | Inverter device | |
| JPH0731001A (en) | Power converter for ac electric vehicle and protective operation method therefor | |
| US7227325B1 (en) | Method and arrangement for protecting a frequency converter | |
| JP2004112929A (en) | Ac-dc converter | |
| JPH10164854A (en) | Power converter | |
| JP2868925B2 (en) | Electric car control device | |
| JP2652678B2 (en) | Excessive voltage prevention circuit for automotive generator | |
| JPH11122941A (en) | Detecting method for arm short-circuiting in inverter device | |
| JPH11355905A (en) | Interruption system for power converter | |
| US10291159B2 (en) | Control system, controller, and control method for wound induction machine | |
| JP2000358384A (en) | Power controller | |
| JPH11275872A (en) | Overvoltage protective device for capacitor of power conversion circuit | |
| JP2000316232A (en) | Protective device for power converter | |
| US20240088812A1 (en) | Active Discharge of the DC Link Capacitor of a Three-Phase Inverter by Way of Rotating Half-Bridge Short-Circuits | |
| CN211266457U (en) | Protection circuit of motor drive system and air conditioning equipment | |
| JP2634692B2 (en) | Secondary overvoltage protection device for AC-excited synchronous machine | |
| SU1393669A1 (en) | Protection device for induction electric motor of railway car ventilation system | |
| JP2022079389A (en) | Power conversion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20011009 |