JPH08149868A - Inverter - Google Patents

Inverter

Info

Publication number
JPH08149868A
JPH08149868A JP6279615A JP27961594A JPH08149868A JP H08149868 A JPH08149868 A JP H08149868A JP 6279615 A JP6279615 A JP 6279615A JP 27961594 A JP27961594 A JP 27961594A JP H08149868 A JPH08149868 A JP H08149868A
Authority
JP
Japan
Prior art keywords
circuit
phase
main circuit
voltage
inverter main
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
JP6279615A
Other languages
Japanese (ja)
Inventor
Koji Yamada
幸治 山田
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.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing 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 Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP6279615A priority Critical patent/JPH08149868A/en
Publication of JPH08149868A publication Critical patent/JPH08149868A/en
Pending legal-status Critical Current

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  • Control Of Ac Motors In General (AREA)
  • Stopping Of Electric Motors (AREA)
  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE: To reduce the burden of a mechanical brake in the braking of a motor which is caused by the generation of the fault of an inverter main circuit, and to simplify the processing and circuit for sensing the short-circuit faults of the respective phases and arms of the inverter main circuit. CONSTITUTION: By the sensing signals fed from an overcurrent sensing circuit 6, a control circuit 3 forces the respective arms of an inverter main circuit 1 to be in OFF-states. Thereafter, by the sensing signals fed from a faulty phase sensing circuit 7, the control circuit 3 discriminates between a faulty phase or faulty arm and other sound phases, and by the ON-OFF controls of the arms of the sound phases, it feeds DC currents to a motor 2, and by the application of a DC brake to the motor 2, it stops the motor 2. By the utilization of the fact that the output terminal voltage of the faulty phase whose arm is shorted approximates to the level of the positive or negative electrode of the DC voltage of the inverter main circuit 1, the sensing of the faulty phase is performed while the change of this level is compared with a reference voltage.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、電動機駆動用のインバ
ータに係り、特にインバータ主回路の故障検出と電動機
の制動制御に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter for driving an electric motor, and more particularly to detection of a failure in an inverter main circuit and braking control of the electric motor.

【0002】[0002]

【従来の技術】インバータにより誘導電動機や同期電動
機を駆動する装置において、インバータ主回路の半導体
素子の破損故障には、他の素子及び負荷となる電動機に
まで事故拡大することから保護する手段が設けられる。
2. Description of the Related Art In an apparatus for driving an induction motor or a synchronous motor by an inverter, a device for protecting a semiconductor element of an inverter main circuit from damage and failure is provided to prevent accidents from spreading to other elements and a motor serving as a load. To be

【0003】この保護手段は、過電流検出による運転停
止制御が一般的なものである。図5は、従来の保護装置
を示す。インバータ主回路1は、トランジスタU〜Zの
3相ブリッジ接続で6アーム構成にされ、電動機2に3
相電力を供給する。
This protection means is generally an operation stop control by detecting an overcurrent. FIG. 5 shows a conventional protection device. The inverter main circuit 1 has a 6-arm configuration with a three-phase bridge connection of transistors U to Z, and the motor 2 has three arms.
Supply phase power.

【0004】マイクロコンピュータ構成等になる制御回
路3は、電動機3の速度指令等にしたがって主回路1の
各トランジスタのゲート制御信号を発生する。この制御
信号はゲート制御回路4により各相に分配・増幅され各
トランジスタU〜Zをオン・オフ制御信号にされる。
The control circuit 3 having a microcomputer configuration or the like generates a gate control signal for each transistor of the main circuit 1 in accordance with a speed command of the electric motor 3 or the like. This control signal is distributed / amplified by the gate control circuit 4 into each phase, and is used as an on / off control signal for the transistors U to Z.

【0005】保護装置は、主回路1から電動機2への
U,W相電流を検出器5で検出し、この検出信号から過
電流検出器6が過電流を検出し、制御回路3に伝達す
る。制御回路3は、過電流検出信号でゲート制御回路4
のゲート信号出力をオフ側に強制し、主回路1の各トラ
ンジスタU〜Zをすべてオフにする。
In the protective device, the U and W phase currents from the main circuit 1 to the electric motor 2 are detected by the detector 5, and the overcurrent detector 6 detects the overcurrent from this detection signal and transmits it to the control circuit 3. . The control circuit 3 outputs the overcurrent detection signal to the gate control circuit 4
The gate signal output of is forced to the off side, and all the transistors U to Z of the main circuit 1 are turned off.

【0006】このような保護装置を備えたインバータに
おいて、保護動作により運転を停止した後、再び運転命
令を与えると、故障アームと対になるアームのオン時に
当該相の短絡になる。
In an inverter equipped with such a protection device, if the operation command is given again after the operation is stopped by the protection operation, the relevant phase is short-circuited when the arm paired with the failed arm is turned on.

【0007】例えば、U相の上アームのトランジスタU
が短絡故障して過電流保護がなされた後、再運転で下ア
ームのトランジスタXがオン制御されると、U,Xの両
トランジスタで短絡し、トランジスタXも過電流破損し
てしまう。
For example, a U-phase upper arm transistor U
When the transistor X in the lower arm is turned on by restarting after short-circuit failure and overcurrent protection is performed, both transistors U and X are short-circuited, and the transistor X is also damaged by overcurrent.

【0008】このような事故拡大を防止するため、イン
バータの始動及び再運転時に各相の半導体素子の破損を
検出する回路を設け、破損があるときにはインバータの
運転を禁止する手段が設けられる。
In order to prevent such an accident from spreading, a circuit for detecting damage to the semiconductor element of each phase at the time of starting and restarting the inverter is provided, and means for prohibiting the operation of the inverter when there is damage is provided.

【0009】この主回路故障検出回路には、主回路の各
素子に並列に、抵抗とホトカプラと検出用トランジスタ
の直列回路を設け、インバータの運転前に検出用トラン
ジスタをオンさせ、このオンで検出用トランジスタに電
流が流れるか否か(主回路素子が短絡破損しているか否
か)をホトカプラの出力として得るものがある。
In this main circuit failure detection circuit, a series circuit of a resistor, a photocoupler and a detection transistor is provided in parallel with each element of the main circuit, and the detection transistor is turned on before the operation of the inverter. There is an output of the photocoupler that determines whether or not a current flows through the transistor for use (whether or not the main circuit element is short-circuited and damaged).

【0010】[0010]

【発明が解決しようとする課題】従来の保護装置を備え
たインバータにおいて、電動機の運転中に主回路故障が
発生して過電流停止すると、電動機は負荷と一体又は負
荷から切り離されてフリーラン(空転)状態になり、他
の機械的ブレーキで強制的に停止させるか、わずかの摩
擦損により空転が治まって停止するまで待つことにな
る。
In an inverter equipped with a conventional protection device, if a main circuit failure occurs during operation of the electric motor and an overcurrent stop occurs, the electric motor is integrated with the load or disconnected from the load and runs freely. It will be in the (idle) state, and it will be forced to stop by another mechanical brake, or it will wait until the idling is stopped by a slight friction loss and stops.

【0011】しかしながら、空転が治まるまで待つこと
ができない輸送用電動機(例えば、エレベータや電気自
動車)への適用では、機械的ブレーキを使用し、回転エ
ネルギーを熱に変えて停止させる。このため、ブレーキ
の摺動材への負荷・寿命への悪影響が発生する。
However, in an application to a transportation electric motor (for example, an elevator or an electric vehicle) in which it is not possible to wait until the idling is stopped, a mechanical brake is used to convert the rotational energy into heat and stop the rotation. Therefore, the load on the sliding material of the brake and the life of the brake are adversely affected.

【0012】また、従来の主回路故障検出回路は、主回
路の各アーム別に設けることを必要とし、コスト高にな
る。さらに、故障検出のためには各相別の検出用トラン
ジスタにオン信号を与えて、各ホトカプラからの信号を
個々にチェックするという手順の検出用ソフトウェアを
必要とする。
Further, the conventional main circuit failure detection circuit needs to be provided for each arm of the main circuit, resulting in high cost. Furthermore, in order to detect a failure, detection software is required to apply an ON signal to the detection transistor for each phase and individually check the signal from each photocoupler.

【0013】本発明の目的は、主回路故障の発生による
電動機の制動に機械的ブレーキの負担を軽減するインバ
ータを提供することにある。
It is an object of the present invention to provide an inverter that reduces the load on the mechanical brake when braking the electric motor due to the occurrence of a main circuit failure.

【0014】本発明の他の目的は、主回路の各相及び各
アームの短絡故障の検出のための処理・回路を簡単にす
るインバータを提供することにある。
Another object of the present invention is to provide an inverter that simplifies the process / circuit for detecting a short circuit fault of each phase and each arm of the main circuit.

【0015】[0015]

【課題を解決するための手段】本発明は、前記課題の解
決を図るため、半導体素子のブリッジ接続で構成され出
力端に負荷となる電動機が接続されるインバータ主回路
と、インバータ主回路のゲート制御をし電動機への電流
が過電流になるときにインバータ主回路の運転を停止す
る制御回路とを備えたインバータにおいて、前記インバ
ータ主回路のアーム素子の故障をアーム別又は相別に検
出する故障検出回路を設け、前記制御回路は前記故障検
出回路から故障検出信号で健全相と故障相又は故障アー
ムを記憶し、前記過電流検出後に前記インバータ主回路
の健全相のオン・オフ制御で電動機に一定の直流電流を
供給する制動制御手段を設けたことを特徴とする。
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an inverter main circuit having a bridge connection of semiconductor elements and an output end connected to an electric motor as a load, and a gate of the inverter main circuit. In an inverter having a control circuit for controlling and stopping the operation of the inverter main circuit when the current to the electric motor becomes an overcurrent, a failure detection for detecting a failure of an arm element of the inverter main circuit by arm or phase A circuit is provided, and the control circuit stores a sound phase and a failure phase or a failure arm with a failure detection signal from the failure detection circuit, and after the overcurrent is detected, the sound phase of the inverter main circuit is controlled to be constant to the electric motor. Is provided with a braking control means for supplying the DC current.

【0016】前記故障検出回路は、インバータ主回路の
直流電圧の中間値になる検出基準電圧を得る基準電圧回
路と、この基準電圧回路の検出基準電圧出力とインバー
タ主回路の各相出力端子の電圧を比較入力とし各相出力
端子の電圧が前記直流電圧の正極又は負極のレベルに近
いときに該端子につながる半導体素子の短絡故障として
検出する電圧検出回路とを備えたことを特徴とする。
The failure detection circuit includes a reference voltage circuit that obtains a detection reference voltage that is an intermediate value of the DC voltage of the inverter main circuit, a detection reference voltage output of the reference voltage circuit, and a voltage of each phase output terminal of the inverter main circuit. And a voltage detection circuit for detecting a short-circuit failure of a semiconductor element connected to the terminal when the voltage of each phase output terminal is close to the positive or negative level of the DC voltage.

【0017】[0017]

【作用】[Action]

(第1の発明)主回路素子の破損時に、他の健全素子の
制御により直流ブレーキをかけることにより電動機に電
気的な制動力を発生させて電動機を速やかに停止させ
る。
(First invention) When a main circuit element is broken, a DC brake is applied by controlling other sound elements to generate an electric braking force in the electric motor to quickly stop the electric motor.

【0018】(第2の発明)各アームの短絡故障にはそ
の相の出力電圧が直流電圧の正負極レベルに近いことを
利用して、直流電圧の中間値と各相出力端子の電圧とを
比較することによりインバータ主回路の各相別又は各ア
ーム別の故障を検出する。
(Second invention) For the short-circuit failure of each arm, the fact that the output voltage of the phase is close to the positive and negative electrode levels of the DC voltage is used to determine the intermediate value of the DC voltage and the voltage of each phase output terminal. By comparing, the failure of each phase or each arm of the inverter main circuit is detected.

【0019】[0019]

【実施例】図1は、本発明の一実施例を示す装置構成図
である。制御回路3Aは、従来の運転停止と同様に、過
電流検出回路6からの検出信号でインバータ主回路1の
各アームをオフに強制することでインバータ運転を停止
する。本実施例では、この運転停止制御後に電動機を制
動制御する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention. The control circuit 3A stops the inverter operation by forcibly turning off each arm of the inverter main circuit 1 by the detection signal from the overcurrent detection circuit 6, similarly to the conventional operation stop. In the present embodiment, the electric motor is brake-controlled after the operation stop control.

【0020】このための故障相検出回路7は、インバー
タ主回路1の各相U,V,Wの故障を各アーム別に検出
する。また、制御回路3Aは、故障相検出回路7からの
検出信号と電流検出器5からの電流検出信号を使って制
動制御を行う。
The fault phase detection circuit 7 for this purpose detects a fault in each phase U, V, W of the inverter main circuit 1 for each arm. Further, the control circuit 3A performs braking control using the detection signal from the faulty phase detection circuit 7 and the current detection signal from the current detector 5.

【0021】制御回路3Aは、過電流検出によるインバ
ータ主回路1のオフ制御後、故障相検出回路7からの検
出信号で故障アームとその故障相と健全相を記憶する。
そして、インバータ主回路1の健全相のオン・オフ制御
で電動機に一定の直流電流を供給することにより電動機
2に直流ブレーキをかける。
The control circuit 3A stores the faulty arm, its faulty phase, and its sound phase by the detection signal from the faulty phase detection circuit 7 after the inverter main circuit 1 is turned off by the overcurrent detection.
Then, a DC brake is applied to the electric motor 2 by supplying a constant DC current to the electric motor by the ON / OFF control of the healthy phase of the inverter main circuit 1.

【0022】例えば、故障アームがトランジスタUとす
ると、故障相はU、健全相はV,Wとして記憶し、トラ
ンジスタY又はZをスイッチング制御する。このとき、
トランジスタUはU相の上アームになり、直流電源の正
極側に短絡されているため、トランジスタY又はZをオ
ン制御すると、電動機2の電機子コイル(誘導性リアク
タンス)を通してトランジスタUからトランジスタY又
はZに電流が流れる。この電流により電動機2には直流
ブレーキによる制動力を発生させる。
For example, when the failure arm is the transistor U, the failure phase is stored as U, and the sound phase is stored as V and W, and the transistor Y or Z is switching-controlled. At this time,
Since the transistor U serves as an upper arm of the U-phase and is short-circuited to the positive electrode side of the DC power supply, when the transistor Y or Z is ON-controlled, the transistor U passes through the armature coil (inductive reactance) of the motor 2 or the transistor Y or. An electric current flows through Z. This current causes the electric motor 2 to generate a braking force by a DC brake.

【0023】このときの制動力は、供給する直流電流に
よって制御できる。この制動力を一定値に制御するた
め、制御回路3Aは、電流検出器5からの検出電流が設
定値になるよう健全相のトランジスタ(上記の例ではY
又はZ)のオン・オフ比を制御する。
The braking force at this time can be controlled by the DC current supplied. In order to control this braking force to a constant value, the control circuit 3A sets the healthy phase transistor (Y in the above example) so that the detected current from the current detector 5 becomes a set value.
Alternatively, the on / off ratio of Z) is controlled.

【0024】図2は、制動時の電流制御波形を示し、制
動開始で健全相のトランジスタY又はZのオン制御を行
い(時刻t0)、このオンにより電動機電流が上昇を開
始する。この電流が一定値(上限)に達したとき(時刻
1)、トランジスタのオフを行い、このオフで電流が
一定値からある値まで(下限まで)下がったときにトラ
ンジスタをオンにするというトランジスタのオン・オフ
を繰り返して電動機電流を一定値に制御する。なお、ト
ランジスタYとZの両方をオン・オフ制御することでも
良い。
FIG. 2 shows a current control waveform at the time of braking. At the start of the braking, the ON control of the transistor Y or Z in the normal phase is performed (time t 0 ), and this ON causes the motor current to start rising. A transistor that turns off the transistor when this current reaches a certain value (upper limit) (time t 1 ), and turns on the transistor when the current drops from a certain value to a certain value (up to the lower limit) due to this off The motor current is controlled to a constant value by repeatedly turning on and off. Note that both the transistors Y and Z may be on / off controlled.

【0025】したがって、本実施例によれば、過電流検
出時に故障相又は故障アームを記憶しておき、故障アー
ムと健全相を使って電動機に一定の直流電流を流し、電
動機に直流ブレーキをかけることができ、機械的ブレー
キの負担を軽減して電動機を速やかに停止させることが
できる。
Therefore, according to the present embodiment, the faulty phase or the faulty arm is stored when the overcurrent is detected, and a constant DC current is passed through the motor by using the faulty arm and the sound phase to apply the DC brake to the motor. The load on the mechanical brake can be reduced, and the electric motor can be stopped quickly.

【0026】なお、本実施例において、健全相のみを使
って直流ブレーキをかけることができる。例えば、故障
相検出回路7が相別の故障検出機能(アーム別検出機能
を持たない)になるとき、U相の故障検出には、トラン
ジスタVをオン制御し、トランジスタZをオン・オフ制
御することで直流ブレーキをかけることができる。
In this embodiment, the DC brake can be applied using only the sound phase. For example, when the failure phase detection circuit 7 has a failure detection function for each phase (does not have an arm-specific detection function), the transistor V is ON-controlled and the transistor Z is ON / OFF-controlled for the U-phase failure detection. By doing so, the DC brake can be applied.

【0027】図3は、故障相検出回路7の実施例を示
す。抵抗R1とR2は、インバータ主回路1の直流電圧
を分圧して直流電圧の中間値になる検出基準電圧を得
る。コンデンサC1とC2は、抵抗R1とR2で分圧し
た電圧を安定化させるためのものである。
FIG. 3 shows an embodiment of the fault phase detection circuit 7. The resistors R1 and R2 divide the DC voltage of the inverter main circuit 1 to obtain a detection reference voltage having an intermediate value of the DC voltage. The capacitors C1 and C2 are for stabilizing the voltage divided by the resistors R1 and R2.

【0028】これら抵抗とコンデンサで構成する基準電
圧回路とインバータ主回路1の各相出力端との間に相別
の電圧検出回路VD1〜VD3を設ける。
Between the reference voltage circuit composed of these resistors and capacitors and the output terminals of each phase of the inverter main circuit 1, voltage detection circuits VD1 to VD3 for each phase are provided.

【0029】電圧検出回路VD1〜VD3は、その1つ
を代表して図4に構成を示す。基準電圧回路の基準電圧
に対して、インバータ主回路1の各相端子電圧が比較入
力として印加され、その間には一対のホトカプラPC
A、PCBの入力素子(発光ダイオード)が逆並列接続
され、これに電流制限抵抗R3が直列接続される。
The voltage detection circuits VD1 to VD3 are shown in FIG. 4 as one of them. Each phase terminal voltage of the inverter main circuit 1 is applied as a comparison input to the reference voltage of the reference voltage circuit, and a pair of photocoupler PC is provided between them.
Input elements (light emitting diodes) of A and PCB are connected in anti-parallel, and a current limiting resistor R3 is connected in series to this.

【0030】ホトカプラの出力素子(光検出トランジス
タ)にはコレクタ抵抗R4、R5を通して制御電源が接
続され、出力素子のオン・オフ動作信号が故障検出信号
として取り出される。
A control power supply is connected to the output element (photodetection transistor) of the photocoupler through collector resistors R4 and R5, and the on / off operation signal of the output element is taken out as a failure detection signal.

【0031】本実施例において、例えば、インバータ主
回路1のトランジスタUが短絡故障したとき、U相の電
圧は直流電圧の正極レベルに近い値になり、電圧検出回
路VD1のホトカプラPCAがオンし続け、トランジス
タUの故障を検出する。逆に、トランジスタXが短絡故
障したとき、U相の電圧は直流電圧の負極レベルに近い
値になり、電圧検出回路VD1のホトカプラPCBがオ
ンし続け、トランジスタXの故障を検出する。
In this embodiment, for example, when the transistor U of the inverter main circuit 1 has a short circuit fault, the voltage of the U phase becomes a value close to the positive level of the DC voltage, and the photocoupler PCA of the voltage detection circuit VD1 keeps on. , The failure of the transistor U is detected. On the contrary, when the transistor X has a short circuit failure, the voltage of the U phase becomes a value close to the negative electrode level of the DC voltage, the photocoupler PCB of the voltage detection circuit VD1 keeps on, and the failure of the transistor X is detected.

【0032】これら故障検出は、インバータ主回路1の
運転中及び停止中のいずれにも検出できる。
These faults can be detected both while the inverter main circuit 1 is operating and when it is stopped.

【0033】本実施例によれば、従来の故障検出回路が
各相別にチェック信号を与える故障検出制御信号を必要
とするのに対して、これら信号処理を不要にしてアーム
別の故障を検出できる。
According to the present embodiment, the conventional failure detection circuit requires the failure detection control signal for providing the check signal for each phase, whereas the signal processing is not necessary and the failure for each arm can be detected. .

【0034】なお、相別の故障検出で良い場合は、ホト
カプラPCAとPCBの出力素子を共通にする構成、す
なわちホトカプラの入力素子は2つにし、出力素子を1
つにした一体構成とすることにより、相の上アーム又は
下アームが故障したときに相故障の検出を得ることがで
きる。この場合には回路構成も簡略化できる。
If the failure detection for each phase is sufficient, the photocoupler PCA and the output element of the PCB are common, that is, the photocoupler has two input elements and one output element.
With the integrated structure, it is possible to detect the phase failure when the upper arm or the lower arm of the phase fails. In this case, the circuit configuration can be simplified.

【0035】また、インバータ主回路1の故障検出で良
い場合は、全てのホトカプラの出力素子の論理和を取
り、1つの検出信号として取り出す構成にできる。
Further, when the failure detection of the inverter main circuit 1 is sufficient, the logical sum of the output elements of all the photocouplers can be taken and taken out as one detection signal.

【0036】[0036]

【発明の効果】以上のとおり、本発明によれば、故障検
出回路によりインバータ主回路のアーム別又は相別に検
出し、この故障検出から故障アーム又は故障相と健全相
を識別し、健全素子の制御により電動機に一定の直流電
流を流す制御をするようにしたため、故障発生時には電
動機に電気的な制動力を発生させ、機械ブレーキの負担
を軽減して電動機を速やかに停止させることができる。
As described above, according to the present invention, the failure detection circuit detects each arm or phase of the inverter main circuit, and from this failure detection, the failure arm or the failure phase and the sound phase are discriminated, and the sound element is detected. Since a constant DC current is supplied to the electric motor by the control, when a failure occurs, an electric braking force is generated in the electric motor, the load on the mechanical brake is reduced, and the electric motor can be stopped quickly.

【0037】また、本発明は、インバータ主回路の故障
検出回路は、インバータ主回路の直流電圧の中間値にな
る検出基準電圧を得る基準電圧回路と、この基準電圧回
路の検出基準電圧出力とインバータ主回路の各相出力端
子の電圧を比較入力とし各相出力端子の電圧が前記直流
電圧の正極又は負極のレベルに近いときに該端子につな
がる半導体素子の短絡故障として検出する電圧検出回路
との構成としたため、故障検出のための制御・処理が不
要になる。また、相別の故障検出や主回路の故障検出に
は回路構成の簡単化を図ることができる。
Further, according to the present invention, the failure detection circuit of the inverter main circuit has a reference voltage circuit for obtaining a detection reference voltage which is an intermediate value of the DC voltage of the inverter main circuit, and the detection reference voltage output of the reference voltage circuit and the inverter. With a voltage detection circuit that uses the voltage of each phase output terminal of the main circuit as a comparison input and detects as a short-circuit fault of the semiconductor element connected to the terminal when the voltage of each phase output terminal is close to the positive or negative level of the DC voltage Since the configuration is adopted, control / processing for detecting a failure is unnecessary. In addition, the circuit configuration can be simplified for the failure detection for each phase and the failure detection for the main circuit.

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

【図1】本発明の一実施例を示す装置構成図。FIG. 1 is a device configuration diagram showing an embodiment of the present invention.

【図2】実施例における制動時の電流制御波形。FIG. 2 is a current control waveform during braking in the embodiment.

【図3】実施例における故障相検出回路。FIG. 3 is a fault phase detection circuit in the embodiment.

【図4】実施例における電圧検出回路。FIG. 4 is a voltage detection circuit according to an embodiment.

【図5】従来の保護装置構成図。FIG. 5 is a block diagram of a conventional protection device.

【符号の説明】[Explanation of symbols]

1…インバータ主回路 2…負荷となる電動機 3、3A…制御回路 4…ゲート制御回路 5…電流検出器 6…過電流検出回路 7…故障相検出回路 VD1、VD2、VD3…電圧検出回路 DESCRIPTION OF SYMBOLS 1 ... Inverter main circuit 2 ... Load electric motor 3, 3A ... Control circuit 4 ... Gate control circuit 5 ... Current detector 6 ... Overcurrent detection circuit 7 ... Fault phase detection circuit VD1, VD2, VD3 ... Voltage detection circuit

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 半導体素子のブリッジ接続で構成され出
力端に負荷となる電動機が接続されるインバータ主回路
と、インバータ主回路のゲート制御をし電動機への電流
が過電流になるときにインバータ主回路の運転を停止す
る制御回路とを備えたインバータにおいて、 前記インバータ主回路のアーム素子の故障をアーム別又
は相別に検出する故障検出回路を設け、前記制御回路は
前記故障検出回路から故障検出信号で健全相と故障相又
は故障アームを記憶し、前記過電流検出後に前記インバ
ータ主回路の健全相のオン・オフ制御で電動機に一定の
直流電流を供給する制動制御手段を設けたことを特徴と
するインバータ。
1. An inverter main circuit configured by bridge connection of semiconductor elements and having an output end connected to an electric motor that serves as a load, and an inverter main circuit that controls the gate of the inverter main circuit and causes an overcurrent in the electric motor. In an inverter having a control circuit for stopping the operation of the circuit, a failure detection circuit for detecting a failure of an arm element of the inverter main circuit is provided for each arm or each phase, and the control circuit is provided with a failure detection signal from the failure detection circuit. And a braking control unit for storing a constant DC current to the electric motor by ON / OFF control of the healthy phase of the inverter main circuit after detection of the overcurrent, Inverter to do.
【請求項2】 前記故障検出回路は、インバータ主回路
の直流電圧の中間値になる検出基準電圧を得る基準電圧
回路と、この基準電圧回路の検出基準電圧出力とインバ
ータ主回路の各相出力端子の電圧を比較入力とし各相出
力端子の電圧が前記直流電圧の正極又は負極のレベルに
近いときに該端子につながる半導体素子の短絡故障とし
て検出する電圧検出回路とを備えたことを特徴とするイ
ンバータ。
2. The failure detection circuit includes a reference voltage circuit that obtains a detection reference voltage that is an intermediate value of a DC voltage of the inverter main circuit, a detection reference voltage output of the reference voltage circuit, and each phase output terminal of the inverter main circuit. And a voltage detection circuit for detecting as a short-circuit fault of a semiconductor element connected to the terminal when the voltage of each phase output terminal is close to the positive or negative level of the DC voltage. Inverter.
JP6279615A 1994-11-15 1994-11-15 Inverter Pending JPH08149868A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6279615A JPH08149868A (en) 1994-11-15 1994-11-15 Inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6279615A JPH08149868A (en) 1994-11-15 1994-11-15 Inverter

Publications (1)

Publication Number Publication Date
JPH08149868A true JPH08149868A (en) 1996-06-07

Family

ID=17613457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6279615A Pending JPH08149868A (en) 1994-11-15 1994-11-15 Inverter

Country Status (1)

Country Link
JP (1) JPH08149868A (en)

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