JPH09182447A - Abnormality detecting circuit of power converter - Google Patents
Abnormality detecting circuit of power converterInfo
- Publication number
- JPH09182447A JPH09182447A JP7333538A JP33353895A JPH09182447A JP H09182447 A JPH09182447 A JP H09182447A JP 7333538 A JP7333538 A JP 7333538A JP 33353895 A JP33353895 A JP 33353895A JP H09182447 A JPH09182447 A JP H09182447A
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- Prior art keywords
- power converter
- voltage detector
- output
- voltage
- current
- Prior art date
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- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、多相交流出力を
発生するように構成した電力変換器の異常検出回路に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detection circuit for a power converter configured to generate a polyphase AC output.
【０００２】[0002]
【従来の技術】図５は、（社）発明協会発行の発明協会
公開技報Ｖｏｌ．１１−３７、公技番号８６−１１０４
５号に記載のインバータ装置の異常検出回路（不足電圧
検出回路）である。図において、１０は三相ブリッジイ
ンバータ（以下、単にインバータと呼ぶ）、１１は漏れ
リアクタンスを有する変圧器、１２UV、１２VW、１２WU
はインバータ１０の出力側各線間に挿入したコンデンサ
で、変圧器２の漏れリアクタンスとコンデンサ１２UV、
１２VW、１２WUとでフィルタ回路を構成している。１３
は負荷、１４はインバータ１の出力側線間電圧ＶUV、Ｖ
VW、ＶWUを検出する電圧検出器、１５は電圧検出器１４
の出力を整流する整流回路、１６は比較器、１７’は故
障処理回路である。2. Description of the Related Art FIG. 5 shows an invention association published technical report Vol. 11-37, Official Skill Number 86-1104
It is an abnormality detection circuit (undervoltage detection circuit) of the inverter device described in No. 5. In the figure, 10 is a three-phase bridge inverter (hereinafter, simply referred to as an inverter), 11 is a transformer having a leakage reactance, 12 UV , 12 VW , 12 WU.
Is a capacitor inserted between the output side lines of the inverter 10, the leakage reactance of the transformer 2 and the capacitor 12 UV ,
A filter circuit is composed of 12 VW and 12 WU . 13
Is a load, and 14 is the output side line voltage V UV , V of the inverter 1.
A voltage detector for detecting VW and VWU , 15 is a voltage detector 14
Is a rectifier circuit for rectifying the output of the comparator, 16 is a comparator, and 17 'is a failure processing circuit.
【０００３】次に動作について説明する。インバータ１
０の出力電圧を変圧器１１の漏れリアクタンスとコンデ
ンサ１２UV、１２VW、１２WUとで構成するフィルタ回路
を介して制御し、負荷１３に安定な電力を供給する。イ
ンバータ１０の出力電圧を比較器１６で監視し、インバ
ータ１０が何らかの原因で異常電圧を出力すると、負荷
に異常電圧を印加しないよう、故障処理回路１７’がイ
ンバータ１０を停止させる。Next, the operation will be described. Inverter 1
The output voltage of 0 is controlled via a filter circuit composed of the leakage reactance of the transformer 11 and the capacitors 12 UV , 12 VW , and 12 WU to supply stable power to the load 13. The output voltage of the inverter 10 is monitored by the comparator 16, and when the inverter 10 outputs an abnormal voltage for some reason, the failure processing circuit 17 ′ stops the inverter 10 so that the abnormal voltage is not applied to the load.
【０００４】[0004]
【発明が解決しようとする課題】従来のインバータの異
常検出回路は以上のように構成しており、１つの電圧検
出器で検出したインバータ出力電圧でインバータの電圧
制御とインバータの異常電圧保護を行うので、例えば電
圧検出器の検出ゲインが低下すると、インバータの制御
回路には、実際より小さな出力電圧があるものとしてフ
ィードバックするためインバータの出力電圧が過大なも
のになる。異常検出回路は検出ゲインの低下した電圧検
出器出力によって動作するため、この異常電圧を検出す
ることはできない。これを防止するには、制御用と保護
用の２つの電圧検出器を用いなければならないという問
題点があった。The conventional inverter abnormality detection circuit is configured as described above, and performs inverter voltage control and inverter abnormal voltage protection by the inverter output voltage detected by one voltage detector. Therefore, for example, when the detection gain of the voltage detector is lowered, the control circuit of the inverter feeds back as if there is an output voltage smaller than the actual output voltage, so that the output voltage of the inverter becomes excessive. Since the abnormality detection circuit operates by the output of the voltage detector whose detection gain is lowered, this abnormality voltage cannot be detected. In order to prevent this, there is a problem that two voltage detectors for control and protection must be used.
【０００５】この発明は、上述のような課題を解決する
ためになされたもので、電圧検出器の異常を検出するこ
とによって、１つの電圧検出器のみで、電圧検出器に異
常を生じた場合でも負荷に異常電圧を印加することのな
いインバータの制御を行うことのできる異常検出回路を
実現することを目的とする。The present invention has been made in order to solve the above-mentioned problems, and in the case where an abnormality occurs in the voltage detector with only one voltage detector by detecting the abnormality in the voltage detector. However, it is an object of the present invention to realize an abnormality detection circuit capable of controlling an inverter without applying an abnormal voltage to a load.
【０００６】[0006]
【課題を解決するための手段】３相交流を出力するイン
バータ装置とこのインバータ装置に接続した３相変圧器
とこの３相変圧器に接続したフィルタコンデンサとイン
バータ装置の故障を検出をするとともにインバータ装置
の保護動作を行う故障処理回路とを備える電力変換器に
対して、この電力変換器の出力電圧に基づいて異常の検
出を行う電力変換器の異常検出回路において、電力変換
器の出力電圧を検出する電圧検出器と、この電圧検出器
が正常であるときこの電圧検出器の３つの出力を加算し
た結果が原理的に零になるように電圧検出器の３つの出
力を加算する加算器とを備え、この加算器の出力が所定
の値を超えたとき電圧検出器の異常状態として故障処理
回路に電力変換器の保護動作を行わせるように構成し
た。Means for Solving the Problems An inverter device for outputting a three-phase alternating current, a three-phase transformer connected to the inverter device, a filter capacitor connected to the three-phase transformer, and a failure of the inverter device are detected and the inverter is also provided. In the abnormality detection circuit of the power converter that detects an abnormality based on the output voltage of this power converter, the output voltage of the power converter is A voltage detector for detecting, and an adder for adding the three outputs of the voltage detector so that the result of adding the three outputs of the voltage detector when the voltage detector is normal is theoretically zero When the output of the adder exceeds a predetermined value, the failure processing circuit is configured to perform the protection operation of the power converter as an abnormal state of the voltage detector.
【０００７】また、３相交流を出力するインバータ装置
とこのインバータ装置に接続しその負荷側を星形接続し
て３相４線式負荷に給電する３相変圧器とこの３相変圧
器に接続したフィルタコンデンサと前記インバータ装置
の故障を検出をするとともにインバータ装置の保護動作
を行う故障処理回路とを備える電力変換器に対して、こ
の電力変換器の出力電圧に基づいて異常の検出を行う電
力変換器の異常検出回路において、電力変換器出力の相
電圧を検出する電圧検出器と、中性点電流を検出する中
性点電流検出手段と、中性点電流から３相変圧器の漏れ
リアクタンスによる電圧降下を演算によって求める微分
器と、電圧検出器が正常であるとき電圧検出器の３つの
出力と微分器の出力とを加算した結果が原理的に零にな
るように電圧検出器の３つの出力と微分器の出力とを加
算する加算器とを備え、この加算器の出力が所定の値を
超えたとき電圧検出器の異常状態として故障処理回路に
電力変換器の保護動作を行わせるように構成した。Further, an inverter device for outputting a three-phase alternating current and a three-phase transformer for connecting to the inverter device and connecting the load side thereof in a star shape to feed a three-phase four-wire type load and the three-phase transformer are connected. Power for detecting an abnormality on the basis of the output voltage of the power converter, for a power converter including a filter capacitor and a failure processing circuit for detecting a failure of the inverter device and performing a protective operation of the inverter device. In a converter abnormality detection circuit, a voltage detector for detecting a phase voltage of an output of a power converter, a neutral point current detecting means for detecting a neutral point current, and a leak reactance of a three-phase transformer from the neutral point current. The voltage is detected so that the result of adding the three outputs of the voltage detector and the output of the differentiator is zero in principle when the voltage detector is operating normally and the voltage detector is operating normally. And an adder for adding the output of the differentiator to the output of the differentiator, and when the output of the adder exceeds a predetermined value, an abnormal state of the voltage detector is detected, and the failure processing circuit is provided with a protection operation of the power converter. Configured to do.
【０００８】[0008]
【発明の実施の形態】以下、この発明による電力変換器
の異常検出回路について、複数の実施形態を図を用いて
説明する。各図には従来の電力変換器の異常検出回路を
説明するのに用いた図５におけるのと同一もしくは相当
する部分には同一の符号を付し、機能や作用についての
重複する説明は省略する。BEST MODE FOR CARRYING OUT THE INVENTION A plurality of embodiments of an abnormality detection circuit for a power converter according to the present invention will be described below with reference to the drawings. In each drawing, the same or corresponding portions as those in FIG. 5 used for explaining the conventional abnormality detection circuit of the power converter are designated by the same reference numerals, and the duplicated description of the function and action is omitted. .
【０００９】実施形態１．図１は、この発明による第１
の実施形態である電力変換器の異常検出回路であり、１
はインバータ１０出力の各線間電圧ＶUV、ＶVW、ＶWUの
代数和を得る加算器、２は加算１の出力が所定の値を超
えると異常信号を出力する比較器である。次に動作につ
いて説明する。各線間電圧ＶUV、ＶVW、ＶWUの代数和は
原理的に常に０であるから、電圧検出器１４が正常な場
合、加算器１の出力は０である。しかし、電圧検出器１
４の一部に異常が生じると加算器１にある大きさの出力
が生じる。この出力を比較器２により検出して電圧検出
器１４の異常信号を出力し、インバータ１０を停止させ
る。電圧検出器１４には検出誤差があるため、比較器２
がこの検出誤差を異常と判定しないよう、適当な検出幅
をもたせる必要がある。このように、制御用と保護用に
それぞれ独立の電圧検出器を用いることなく、インバー
タの制御と負荷の保護が行なえる。Embodiment 1 FIG. 1 shows a first embodiment of the present invention.
An abnormality detection circuit for a power converter according to the embodiment of
Is an adder that obtains the algebraic sum of the line voltages V UV , V VW , and V WU of the inverter 10 output, and 2 is a comparator that outputs an abnormal signal when the output of addition 1 exceeds a predetermined value. Next, the operation will be described. In principle, the algebraic sum of the line voltages V UV , V VW , and V WU is always 0. Therefore, when the voltage detector 14 is normal, the output of the adder 1 is 0. However, the voltage detector 1
When an abnormality occurs in a part of 4, the output of the adder 1 having a certain magnitude is generated. This output is detected by the comparator 2, an abnormal signal of the voltage detector 14 is output, and the inverter 10 is stopped. Since the voltage detector 14 has a detection error, the comparator 2
However, it is necessary to have an appropriate detection width so that this detection error is not judged to be abnormal. In this way, inverter control and load protection can be performed without using independent voltage detectors for control and protection.
【００１０】実施形態２．図２は、この発明による第２
の実施形態である電力変換器の異常検出回路であり、３
相４線式の負荷１３’に電力を供給するようにしたイン
バータ１０の異常検出を行うようにしたものである。変
圧器１１’の２次側は星形接続で、Ｕ相、Ｖ相、Ｗ相と
ともに中性点Ｎが負荷４に接続してある。また、Ｕ相、
Ｖ相、Ｗ相と中性点Ｎの間にはコンデンサ１２U 、１２
V 、１２W が接続してある。電圧検出器１４’はインバ
ータ１０の各相電圧を、電流検出器３は変圧器１１’か
ら中性点Ｎに流れる電流（以下、Ｎ相電流と呼ぶ）を検
出する。４は微分器、５は減算器である。Embodiment 2 FIG. FIG. 2 shows a second embodiment of the present invention.
3 is an abnormality detection circuit of the power converter according to the embodiment of
This is to detect an abnormality of the inverter 10 that supplies electric power to the load 13 ′ of the phase 4-wire system. The secondary side of the transformer 11 'is star-shaped, and the neutral point N is connected to the load 4 together with the U-phase, V-phase and W-phase. Also, U phase,
Between the V and W phases and the neutral point N, capacitors 12 U and 12
V and 12 W are connected. The voltage detector 14 'detects each phase voltage of the inverter 10, and the current detector 3 detects a current (hereinafter, referred to as N-phase current) flowing from the transformer 11' to the neutral point N. 4 is a differentiator and 5 is a subtractor.
【００１１】負荷１３’が３相不平衡である場合、相電
圧ＶU 、ＶV 、ＶW の代数和は０にならない。この原因
は、変圧器１１’の漏れリアクタンスによる電圧降下が
不平衡になるためである。しかし周知の通り、Ｎ相電流
が変圧器１１’の各相の漏れリアクタンスに流れるとし
たときに生じる電圧降下は相電圧ＶU 、ＶV 、ＶW の代
数和と等しい。このことから、変圧器１１’に流れるＮ
相電流を定数倍（変圧器２の漏れリアクタンスの大きさ
に応じた倍率）して微分し、相電圧ＶU 、ＶV 、ＶW の
代数和から減算した量で電圧検出器の状態を監視すれ
ば、この発明の第１の実施形態と同様に制御用と保護用
にそれぞれ独立の電圧検出器を用いることなく、インバ
ータ１０の制御と負荷の保護を行なうことができる。When the load 13 'is three-phase unbalanced, the algebraic sum of the phase voltages V U , V V and V W does not become zero. This is because the voltage drop due to the leakage reactance of the transformer 11 'becomes unbalanced. However, as is well known, the voltage drop that occurs when the N-phase current flows through the leakage reactance of each phase of the transformer 11 ′ is equal to the algebraic sum of the phase voltages V U , V V , and V W. From this, the N flowing in the transformer 11 '
Phase current is multiplied by a constant (multiplication according to the magnitude of leakage reactance of the transformer 2) and differentiated, and the state of the voltage detector is monitored by the amount subtracted from the algebraic sum of the phase voltages V U , V V , and V W. By doing so, it is possible to control the inverter 10 and protect the load without using independent voltage detectors for control and protection as in the first embodiment of the present invention.
【００１２】図２と同様の原理に基づいて、図３に示す
ような保護回路によっても制御用と保護用にそれぞれ独
立の電圧検出器を用いることなく、インバータの制御と
負荷の保護を行なうことができる。一般に、過負荷から
インバータを保護するため、負荷電流を監視してインバ
ータが過負荷になるとゲートを遮断するような保護回路
が設けられている。この保護回路を構成する電流検出器
の検出信号を利用することによって、図２を用いて説明
した電力変換器の異常検出回路のようにＮ相電流を検出
する電流検出器３を設けることなくインバータの制御と
負荷の保護が行なえる。図３は、Ｎ相電流をインバータ
の過負荷を検出する電流検出器１８U 、１８Vおよび１
８W で検出する各相の負荷電流から加算器６を用いて代
数和として求め、コンデンサ１２U 、１２V 、１２W に
流れるコンデンサＮ相電流電流検出器３’によって検出
し、両者の代数和として変圧器Ｎ相電流を求め、以下図
２と同様に構成すればよい。Based on the same principle as that of FIG. 2, the protection circuit shown in FIG. 3 also controls the inverter and protects the load without using independent voltage detectors for control and protection. You can Generally, in order to protect the inverter from overload, a protection circuit is provided that monitors the load current and shuts off the gate when the inverter becomes overloaded. By using the detection signal of the current detector which constitutes this protection circuit, the inverter can be provided without providing the current detector 3 for detecting the N-phase current as in the abnormality detection circuit of the power converter described with reference to FIG. Control and load protection. FIG. 3 shows current detectors 18 U , 18 V and 1 for detecting an N-phase current for an inverter overload.
The load current of each phase detected at 8 W is calculated as an algebraic sum using the adder 6 and detected by the capacitor N-phase current / current detector 3 ′ flowing in the capacitors 12 U , 12 V and 12 W, and the algebraic sum of both Then, the transformer N-phase current is obtained, and the same configuration as that shown in FIG.
【００１３】同様に、図４に示すようにコンデンサＮ相
電流についてはＮ相電圧を微分することによって求める
ようにしてもよい。Similarly, the N-phase current of the capacitor may be obtained by differentiating the N-phase voltage as shown in FIG.
【００１４】なお、コンデンサＮ相電流は一般に小さい
ので図４における加算器７および微分器８を省略しても
よい。その理由は、コンデンサ１２U 、１２V 、１２W
の容量および変圧器２の漏れインダクタンスは、装置定
格の数％程度であり、負荷電流に対してコンデンサ電流
は十分小さいので、これを無視しても影響はわずかであ
り、電圧検出器の異常を検出するのにほとんど影響を与
えないからである。Since the capacitor N-phase current is generally small, the adder 7 and the differentiator 8 in FIG. 4 may be omitted. The reason is that capacitors 12 U , 12 V , 12 W
Capacity and the leakage inductance of the transformer 2 are about several% of the device rating, and the capacitor current is sufficiently small with respect to the load current, so even if this is neglected, the effect is slight and the abnormality of the voltage detector is detected. It has almost no effect on the detection.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 この発明の第１の実施形態である電力変換器
の異常検出回路である。FIG. 1 is an abnormality detection circuit for a power converter according to a first embodiment of the present invention.
【図２】 この発明の第２の実施形態である電力変換器
の異常検出回路である。FIG. 2 is an abnormality detection circuit for a power converter according to a second embodiment of the present invention.
【図３】 この発明の第２の実施形態の変形例である電
力変換器の異常検出回路である。FIG. 3 is an abnormality detection circuit for a power converter that is a modification of the second embodiment of the present invention.
【図４】 この発明の第２の実施形態の他の変形例であ
る電力変換器の異常検出回路である。FIG. 4 is an abnormality detection circuit for a power converter that is another modification of the second embodiment of the present invention.
【図５】 従来の電力変換器の異常検出回路である。FIG. 5 is an abnormality detection circuit of a conventional power converter.
１、５、６、７ 加算器 ２ 比較器 ３
電流検出器 ４、８ 微分器 １７ 故障処理回路1, 5, 6, 7 Adder 2 Comparator 3
Current detector 4, 8 Differentiator 17 Fault processing circuit
Claims (4)
のインバータ装置に接続した３相変圧器とこの３相変圧
器に接続したフィルタコンデンサと前記インバータ装置
の故障を検出をするとともに前記インバータ装置の保護
動作を行う故障処理回路とを備える電力変換器に対し
て、この電力変換器の出力電圧に基づいて異常の検出を
行う電力変換器の異常検出回路において、 前記電力変換器の出力電圧を検出する電圧検出器と、こ
の電圧検出器が正常であるときこの電圧検出器の３つの
出力を加算した結果が原理的に零になるように前記電圧
検出器の３つの出力を加算する加算器とを備え、この加
算器の出力が所定の値を超えたとき前記電圧検出器の異
常状態として前記故障処理回路に前記電力変換器の保護
動作を行わせるように構成したことを特徴とする電力変
換器の異常検出回路。1. An inverter device for outputting a three-phase alternating current, a three-phase transformer connected to the inverter device, a filter capacitor connected to the three-phase transformer, and a failure of the inverter device are detected and the inverter device In an abnormality detection circuit of a power converter that detects an abnormality based on an output voltage of the power converter for a power converter that includes a failure processing circuit that performs a protection operation, the output voltage of the power converter is detected. And an adder for adding the three outputs of the voltage detector so that the result of adding the three outputs of the voltage detector is zero in principle when the voltage detector is normal. When the output of the adder exceeds a predetermined value, it is configured as an abnormal state of the voltage detector to cause the failure processing circuit to perform the protection operation of the power converter. Abnormality detection circuit for a power converter according to claim.
のインバータ装置に接続しその負荷側を星形接続して３
相４線式負荷に給電する３相変圧器とこの３相変圧器に
接続したフィルタコンデンサと前記インバータ装置の故
障を検出をするとともに前記インバータ装置の保護動作
を行う故障処理回路とを備える電力変換器に対して、こ
の電力変換器の出力電圧に基づいて異常の検出を行う電
力変換器の異常検出回路において、 前記電力変換器出力の相電圧を検出する電圧検出器と、
中性点電流を検出する中性点電流検出手段と、前記中性
点電流から前記３相変圧器の漏れリアクタンスによる電
圧降下を演算によって求める微分器と、前記電圧検出器
が正常であるとき前記電圧検出器の３つの出力と前記微
分器の出力とを加算した結果が原理的に零になるように
前記電圧検出器の３つの出力と前記微分器の出力とを加
算する加算器とを備え、この加算器の出力が所定の値を
超えたとき前記電圧検出器の異常状態として前記故障処
理回路に前記電力変換器の保護動作を行わせるように構
成したことを特徴とする電力変換器の異常検出回路。2. An inverter device for outputting a three-phase alternating current, and the inverter device connected to the inverter device, and the load side of which is star-connected.
Power conversion including a three-phase transformer for supplying a four-phase four-wire load, a filter capacitor connected to the three-phase transformer, and a failure processing circuit that detects a failure of the inverter device and protects the inverter device A voltage detector that detects a phase voltage of the power converter output in an abnormality detection circuit of the power converter that detects an abnormality based on the output voltage of the power converter,
A neutral point current detecting means for detecting a neutral point current, a differentiator for calculating a voltage drop due to a leakage reactance of the three-phase transformer from the neutral point current, and a normalizer for the voltage detector. And an adder for adding the three outputs of the voltage detector and the differentiator so that the result of adding the three outputs of the voltage detector and the differentiator becomes zero in principle. A power converter characterized in that when the output of the adder exceeds a predetermined value, the failure processing circuit is caused to perform a protective operation of the power converter as an abnormal state of the voltage detector. Anomaly detection circuit.
を検出する負荷電流検出器と前記フィルタコンデンサを
流れる電流のコンデンサ電流検出器と前記負荷電流検出
器出力と前記コンデンサ電流検出器出力を加算する加算
器からなることを特徴とする請求項２に記載の電力変換
器の異常検出回路。3. A load current detector for detecting the phase current of a load by the neutral point current detecting means, a capacitor current detector for the current flowing through the filter capacitor, the load current detector output, and the capacitor current detector output. The abnormality detection circuit of the power converter according to claim 2, comprising an adder for adding
検出器出力を加算する第２の加算器の出力を演算して前
記フィルタコンデンサを流れる電流を演算によって求め
る第２の微分器からなることを特徴とする請求項３に記
載の電力変換器の異常検出回路。4. The capacitor current detecting means comprises a second differentiator for calculating the output of a second adder for adding the outputs of the voltage detector to obtain the current flowing through the filter capacitor by calculation. The abnormality detection circuit for a power converter according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33353895A JP3269368B2 (en) | 1995-12-21 | 1995-12-21 | Power converter abnormality detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33353895A JP3269368B2 (en) | 1995-12-21 | 1995-12-21 | Power converter abnormality detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09182447A true JPH09182447A (en) | 1997-07-11 |
| JP3269368B2 JP3269368B2 (en) | 2002-03-25 |
Family
ID=18267174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33353895A Expired - Lifetime JP3269368B2 (en) | 1995-12-21 | 1995-12-21 | Power converter abnormality detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3269368B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3327927A1 (en) | 2016-11-28 | 2018-05-30 | Toyota Jidosha Kabushiki Kaisha | Motor driving device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63253877A (en) * | 1987-04-10 | 1988-10-20 | Toshiba Corp | Controller for inverter |
| JPH01177872A (en) * | 1988-01-07 | 1989-07-14 | Fuji Electric Co Ltd | Current instantaneous-value control type pwm inverter |
| JPH06245301A (en) * | 1993-02-17 | 1994-09-02 | Hitachi Ltd | Open-phase detection system in controller for electric vehicle |
-
1995
- 1995-12-21 JP JP33353895A patent/JP3269368B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63253877A (en) * | 1987-04-10 | 1988-10-20 | Toshiba Corp | Controller for inverter |
| JPH01177872A (en) * | 1988-01-07 | 1989-07-14 | Fuji Electric Co Ltd | Current instantaneous-value control type pwm inverter |
| JPH06245301A (en) * | 1993-02-17 | 1994-09-02 | Hitachi Ltd | Open-phase detection system in controller for electric vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3327927A1 (en) | 2016-11-28 | 2018-05-30 | Toyota Jidosha Kabushiki Kaisha | Motor driving device |
| US10044299B2 (en) | 2016-11-28 | 2018-08-07 | Toyota Jidosha Kabushiki Kaisha | Motor driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3269368B2 (en) | 2002-03-25 |
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