JP2003304634A - Power converter - Google Patents
Power converterInfo
- Publication number
- JP2003304634A JP2003304634A JP2002106639A JP2002106639A JP2003304634A JP 2003304634 A JP2003304634 A JP 2003304634A JP 2002106639 A JP2002106639 A JP 2002106639A JP 2002106639 A JP2002106639 A JP 2002106639A JP 2003304634 A JP2003304634 A JP 2003304634A
- Authority
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- Japan
- Prior art keywords
- signal
- current
- output
- value
- minimum value
- 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.)
- Granted
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- Emergency Protection Circuit Devices (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、出力ケーブルの断
線検出機能を備えた電力変換装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter having a function of detecting disconnection of an output cable.
【０００２】[0002]
【従来の技術】従来の電力変換装置としては、図８に示
す構成のものがよく知られている。同図において、直流
電源１からの直流電圧は、インバータ回路２により任意
の周波数の（通常は３相）交流電圧に変換され、負荷と
しての電動機３に可変周波数の交流電力が供給されるよ
うになっている。インバータ回路２の出力ケーブルに
は、出力電流を検出する電流検出器としての変流器５が
取り付けられ、変流器５で検出された出力電流信号は、
整流器６で整流された後、電動機３の回転数を制御する
制御回路７に入力されている。制御回路７には、この整
流された出力電流信号と速度設定器４で発生した速度基
準信号４ａとが入力されている。2. Description of the Related Art As a conventional power conversion device, a structure shown in FIG. 8 is well known. In the figure, the DC voltage from the DC power supply 1 is converted into an AC voltage of an arbitrary frequency (usually three-phase) by the inverter circuit 2 so that the AC electric power of a variable frequency is supplied to the electric motor 3 as a load. Has become. A current transformer 5 as a current detector for detecting an output current is attached to the output cable of the inverter circuit 2, and the output current signal detected by the current transformer 5 is
After being rectified by the rectifier 6, it is input to the control circuit 7 that controls the rotation speed of the electric motor 3. The rectified output current signal and the speed reference signal 4a generated by the speed setter 4 are input to the control circuit 7.
【０００３】次に、装置動作を簡単に説明する。制御回
路７は、速度設定器４からの速度基準信号４ａと整流器
６で整流された出力電流信号とから電動機３が所定の回
転数となるようにインバータ回路２に制御信号７ａを出
力する。インバータ回路２は、スイッチング素子として
自己消弧型の素子（最近ではＩＧＢＴが主流）が使用さ
れており、制御回路７により出力波形及び出力周波数が
制御される。Next, the operation of the apparatus will be briefly described. The control circuit 7 outputs a control signal 7a to the inverter circuit 2 based on the speed reference signal 4a from the speed setter 4 and the output current signal rectified by the rectifier 6 so that the electric motor 3 has a predetermined rotation speed. In the inverter circuit 2, a self-extinguishing type element (IGBT is mainly used recently) is used as a switching element, and the output waveform and the output frequency are controlled by the control circuit 7.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
電力変換装置は、出力ケーブルが断線した場合に運転を
継続してしまうという問題があった。However, the conventional power converter has a problem that the operation is continued when the output cable is broken.
【０００５】本発明は、上記に鑑みてなされたもので、
出力ケーブルが断線したとき、これを確実に検出して運
転を停止することができ、信頼性を向上させることがで
きる電力変換装置を提供することを目的とする。The present invention has been made in view of the above,
It is an object of the present invention to provide a power conversion device that can reliably detect the disconnection of an output cable and stop the operation, and improve reliability.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、請求項１記載の発明は、出力電流を検出する電流検
出手段と、この電流検出手段で検出した出力電流信号を
整流する整流手段と、この整流した出力電流信号の最大
値及び最小値を演算する電流信号演算手段と、この電流
信号演算手段からの最大値と最小値の差が予め定めた電
流偏差設定値以上となったとき偏差大信号を出力する電
流偏差検出手段と、前記最小値が予め定めた所定値以下
となったとき低下信号を出力する電流レベル検出手段
と、前記偏差大信号と前記低下信号の論理積をとって断
線検出信号を出力する断線検出手段と、前記断線検出信
号により装置動作を停止する制御手段とを有することを
要旨とする。この構成により、出力ケーブルが断線した
とき、断線した相の出力電流が流れなくなるため、整流
した出力電流信号の最小値が低下し、出力電流信号の最
大値と最小値の差が大きくなる。この最大値と最小値の
差が電流偏差設定値を超えると電流偏差検出手段から偏
差大信号が出力される。また最小値が所定値以下になる
と電流レベル検出手段から低下信号が出力される。この
偏差大信号と低下信号の論理積をとることで、出力ケー
ブルの断線が確実に検出されて運転が停止される。In order to solve the above-mentioned problems, the present invention according to claim 1 provides a current detecting means for detecting an output current and a rectifying means for rectifying an output current signal detected by the current detecting means. And a current signal calculating means for calculating the maximum value and the minimum value of the rectified output current signal, and when the difference between the maximum value and the minimum value from the current signal calculating means is equal to or more than a predetermined current deviation set value. A current deviation detecting means for outputting a large deviation signal, a current level detecting means for outputting a decreasing signal when the minimum value becomes equal to or less than a predetermined value, and a logical product of the large deviation signal and the decreasing signal are obtained. The present invention has a gist that it has a disconnection detecting means for outputting a disconnection detection signal and a control means for stopping the operation of the device by the disconnection detection signal. With this configuration, when the output cable is disconnected, the output current of the disconnected phase does not flow, so that the minimum value of the rectified output current signal decreases and the difference between the maximum value and the minimum value of the output current signal increases. When the difference between the maximum value and the minimum value exceeds the current deviation set value, the current deviation detection means outputs a large deviation signal. Further, when the minimum value becomes equal to or less than the predetermined value, the current level detecting means outputs a decrease signal. By taking the logical product of this large deviation signal and the reduced signal, the disconnection of the output cable is reliably detected and the operation is stopped.
【０００７】請求項２記載の発明は、請求項１記載の電
力変換装置において、前記整流手段で整流した出力電流
信号の平均値を検出する平均値検出手段と、この平均値
検出手段で検出した平均値に応じて前記電流偏差設定値
を補正することを要旨とする。この構成により、負荷量
の変化等があると、出力電流信号の平均値が変化する。
平均値に応じて電流偏差設定値を補正することで、負荷
量の変化等に対しても、出力ケーブルの断線を確実に検
出することが可能となる。According to a second aspect of the invention, in the power converter according to the first aspect, an average value detecting means for detecting an average value of the output current signal rectified by the rectifying means, and the average value detecting means detect the average value. The gist is to correct the current deviation set value according to the average value. With this configuration, when the load amount changes, the average value of the output current signal changes.
By correcting the current deviation set value according to the average value, it becomes possible to reliably detect the disconnection of the output cable even when the load amount changes.
【０００８】請求項３記載の発明は、出力電流を検出す
る電流検出手段と、この電流検出手段で検出した出力電
流信号を整流する整流手段と、この整流した出力電流信
号の最大値及び最小値を演算する電流信号演算手段と、
この電流信号演算手段からの最大値と最小値の差が予め
定めた電流偏差設定値を一定期間継続して超えたときは
偏差大継続信号を出力し、一定期間継続しないときは制
御異常信号を出力する制御異常判断手段と、前記最小値
が予め定めた所定値以下となったとき低下信号を出力す
る電流レベル検出手段と、前記偏差大継続信号と前記低
下信号の論理積をとって断線検出信号を出力する断線検
出手段と、前記断線検出信号により装置動作を停止する
制御手段とを有することを要旨とする。この構成によ
り、制御異常判断手段では、出力電流信号の最大値と最
小値の差が電流偏差設定値を一定期間継続して超えたと
き偏差大継続信号が出力され、一定期間継続しないとき
は制御異常信号が出力される。偏差大継続信号が出力さ
れたときは、これと低下信号の論理積をとることで出力
ケーブルの断線が検出されて運転が停止される。一方、
制御異常信号が出力されたときは、出力ケーブルの断線
ではなく、制御上の不安定と判断される。According to a third aspect of the present invention, current detecting means for detecting the output current, rectifying means for rectifying the output current signal detected by the current detecting means, and maximum and minimum values of the rectified output current signal. Current signal calculating means for calculating
When the difference between the maximum value and the minimum value from the current signal calculating means exceeds a predetermined current deviation set value for a certain period of time, a deviation large continuation signal is output, and when it does not continue for a certain period of time, a control abnormality signal is output. A control abnormality determining means for outputting, a current level detecting means for outputting a decrease signal when the minimum value becomes equal to or less than a predetermined value, and a disconnection detection by taking a logical product of the deviation large continuation signal and the decrease signal. The gist of the present invention is to have a disconnection detection means for outputting a signal and a control means for stopping the operation of the device by the disconnection detection signal. With this configuration, the control abnormality determination means outputs the large deviation continuation signal when the difference between the maximum value and the minimum value of the output current signal exceeds the current deviation set value for a certain period of time continuously, and when the difference does not continue for a certain period of time, the control is executed. An abnormal signal is output. When the large deviation continuation signal is output, disconnection of the output cable is detected by taking the logical product of this and the drop signal, and the operation is stopped. on the other hand,
When the control abnormality signal is output, it is determined that the control is unstable, not the output cable is broken.
【０００９】請求項４記載の発明は、出力電流を検出す
る電流検出手段と、この電流検出手段で検出した出力電
流信号を整流する整流手段と、この整流した出力電流信
号の最大値及び最小値を演算する電流信号演算手段と、
この電流信号演算手段からの最大値と最小値の差が最大
となるリップル周期と出力周波数の周期とを比較し、前
記リップル周期が前記出力周波数の周期に対し所定値以
下となったときリップル周期検出信号を出力するリップ
ル周期検出手段と、前記最小値が予め定めた所定値以下
となったとき低下信号を出力する電流レベル検出手段
と、前記リップル周期検出信号と前記低下信号の論理積
をとって断線検出信号を出力する断線検出手段と、前記
断線検出信号により装置動作を停止する制御手段とを有
することを要旨とする。この構成により、出力ケーブル
が断線したとき、出力電流信号の最大値と最小値の差が
最大となるリップル周期は、出力周波数の周期以下とな
る。リップル周期検出手段では、このリップル周期と出
力周波数の周期とが比較され、リップル周期が出力周波
数の周期に対し所定値以下となったときリップル周期検
出信号が出力される。このリップル周期検出信号と低下
信号の論理積をとることで、出力ケーブルの断線が確実
に検出されて運転が停止される。According to a fourth aspect of the present invention, current detecting means for detecting the output current, rectifying means for rectifying the output current signal detected by the current detecting means, and maximum and minimum values of the rectified output current signal. Current signal calculating means for calculating
The ripple cycle at which the difference between the maximum value and the minimum value from the current signal calculating means is maximum is compared with the cycle of the output frequency, and when the ripple cycle becomes a predetermined value or less with respect to the cycle of the output frequency, the ripple cycle Ripple cycle detection means for outputting a detection signal, current level detection means for outputting a decrease signal when the minimum value becomes equal to or less than a predetermined value, and a logical product of the ripple cycle detection signal and the decrease signal. The present invention has a gist that it has a disconnection detecting means for outputting a disconnection detection signal and a control means for stopping the operation of the device by the disconnection detection signal. With this configuration, when the output cable is broken, the ripple cycle in which the difference between the maximum value and the minimum value of the output current signal is maximum is equal to or less than the cycle of the output frequency. The ripple cycle detection means compares the ripple cycle with the cycle of the output frequency, and outputs the ripple cycle detection signal when the ripple cycle becomes a predetermined value or less with respect to the cycle of the output frequency. By taking the logical product of this ripple cycle detection signal and the drop signal, disconnection of the output cable is reliably detected and operation is stopped.
【００１０】請求項５記載の発明は、出力電流を検出す
る電流検出手段と、この電流検出手段で検出した出力電
流信号を整流する整流手段と、この整流した出力電流信
号の最大値及び最小値を演算する電流信号演算手段と、
前記出力電流信号の最大値から最小値までの時間と出力
周波数の周期とを比較し、前記最大値から最小値までの
時間が前記出力周波数の周期に対し所定値以下となった
ときピーク到達時間検出信号を出力するピーク到達時間
検出手段と、前記最小値が予め定めた所定値以下となっ
たとき低下信号を出力する電流レベル検出手段と、前記
ピーク到達時間検出信号と前記低下信号の論理積をとっ
て断線検出信号を出力する断線検出手段と、前記断線検
出信号により装置動作を停止する制御手段とを有するこ
とを要旨とする。この構成により、出力ケーブルが断線
したとき、出力電流信号の最大値から最小値までの時間
は、出力周波数の周期以下となる。リップル周期検出手
段では、この最大値から最小値までの時間と出力周波数
の周期とが比較され、最大値から最小値までの時間が出
力周波数の周期に対し所定値以下となったときピーク到
達時間検出信号が出力される。このピーク到達時間検出
信号と低下信号の論理積をとることで、出力ケーブルの
断線が確実に検出されて運転が停止される。According to a fifth aspect of the present invention, current detecting means for detecting the output current, rectifying means for rectifying the output current signal detected by the current detecting means, and maximum and minimum values of the rectified output current signal. Current signal calculating means for calculating
The time from the maximum value to the minimum value of the output current signal and the cycle of the output frequency are compared, and the peak arrival time is reached when the time from the maximum value to the minimum value becomes a predetermined value or less with respect to the cycle of the output frequency. Peak arrival time detection means for outputting a detection signal, current level detection means for outputting a decrease signal when the minimum value becomes equal to or less than a predetermined value, and logical product of the peak arrival time detection signal and the decrease signal The gist of the present invention is to have a disconnection detection means for outputting a disconnection detection signal and a control means for stopping the operation of the device by the disconnection detection signal. With this configuration, when the output cable is broken, the time from the maximum value to the minimum value of the output current signal is less than or equal to the cycle of the output frequency. In the ripple cycle detection means, the time from the maximum value to the minimum value is compared with the cycle of the output frequency, and when the time from the maximum value to the minimum value is less than or equal to a predetermined value with respect to the cycle of the output frequency, the peak arrival time is reached. The detection signal is output. By taking the logical product of the peak arrival time detection signal and the drop signal, disconnection of the output cable is reliably detected and the operation is stopped.
【００１１】請求項６記載の発明は、請求項１乃至５の
何れかに記載の電力変換装置において、負荷として複数
台の電動機を駆動することを要旨とする。この構成によ
り、負荷である電動機が複数台になっても、出力ケーブ
ルの断線時には出力電流信号の最小値が低下するため、
出力ケーブルの断線を確実に検出して運転を停止するこ
とが可能となる。A sixth aspect of the invention is characterized in that, in the power conversion device according to any of the first to fifth aspects, a plurality of electric motors are driven as loads. With this configuration, even if there are multiple load motors, the minimum value of the output current signal will drop when the output cable is disconnected.
It becomes possible to reliably detect the disconnection of the output cable and stop the operation.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１３】図１及び図２は、本発明の第１の実施の形
態を示す図である。まず、図１を用いて、本実施の形態
の電力変換装置の構成を説明する。同図において、直流
電源１からの直流電圧は、インバータ回路２により任意
の周波数の（通常は３相）交流電圧に変換され、電動機
３に可変周波数の交流電力が供給されるようになってい
る。インバータ回路２の出力ケーブルには、出力電流を
検出する電流検出手段としての変流器５が取り付けら
れ、変流器５で検出された出力電流信号は、整流手段と
しての整流器６で整流された後、電動機３の回転数を制
御する制御手段としての制御回路７に入力されている。
制御回路７には、この整流された出力電流信号６ａと速
度設定器４で発生した速度基準信号４ａが入力されてい
る。制御回路７は、速度設定器４で設定された速度基準
で電動機３が回転するように、整流された出力電流信号
６ａをフィードバックしつつインバータ回路２に対して
位相制御信号７ａを出力して制御する。FIG. 1 and FIG. 2 are views showing a first embodiment of the present invention. First, the configuration of the power conversion device according to the present embodiment will be described with reference to FIG. In the figure, the DC voltage from the DC power supply 1 is converted into an AC voltage of an arbitrary frequency (usually three-phase) by the inverter circuit 2, and the variable frequency AC power is supplied to the electric motor 3. . The output cable of the inverter circuit 2 is provided with a current transformer 5 as current detection means for detecting an output current, and the output current signal detected by the current transformer 5 is rectified by a rectifier 6 as rectification means. After that, it is input to the control circuit 7 as a control means for controlling the rotation speed of the electric motor 3.
The rectified output current signal 6a and the speed reference signal 4a generated by the speed setter 4 are input to the control circuit 7. The control circuit 7 outputs a phase control signal 7a to the inverter circuit 2 while feeding back the rectified output current signal 6a so that the electric motor 3 rotates on the basis of the speed set by the speed setter 4 and controls the electric current. To do.
【００１４】そして、本実施の形態では、さらに整流器
６の出力端子に電流信号演算手段としての電流信号演算
器８が接続され、電流信号演算器８の出力端子に電流偏
差検出手段としての電流偏差検出器９と電流レベル検出
手段としての電流レベル検出器１０が並列に接続されて
いる。これら電流偏差検出器９と電流レベル検出器１０
の各出力は断線検出手段としての断線検出器１１に入力
され、断線検出器１１の出力は制御回路７に入力されて
いる。電流信号演算器８は、整流器６から整流された出
力電流信号６ａを入力し、その出力電流信号６ａの最大
値と最小値を演算する。電流偏差検出器９は、電流信号
演算器８から最大値８ａと最小値８ｂを入力し、最大値
８ａと最小値８ｂの差が予め定めた電流偏差設定値を超
えたときに偏差大信号９ａを出力する。電流レベル検出
器１０は、電流信号演算器８から最小値８ｂを入力し、
その最小値８ｂが予め設定した所定値以下になったとき
に低下信号１０ａを出力する。断線検出器１１は、電流
偏差検出器９から偏差大信号９ａを入力し、電流レベル
検出器１０から低下信号１０ａを入力して偏差大信号９
ａと低下信号１０ａの論理積をとり、断線検出信号１１
ａを出力する。制御回路７は、断線検出器１１からの断
線検出信号１１ａが入力された場合に装置の停止動作を
行う。Further, in the present embodiment, a current signal calculator 8 as current signal calculator is further connected to the output terminal of the rectifier 6, and a current deviation as a current deviation detector is provided at the output terminal of the current signal calculator 8. A detector 9 and a current level detector 10 as a current level detecting means are connected in parallel. These current deviation detector 9 and current level detector 10
The respective outputs of 1 are input to the disconnection detector 11 as the disconnection detection means, and the output of the disconnection detector 11 is input to the control circuit 7. The current signal calculator 8 inputs the rectified output current signal 6a from the rectifier 6 and calculates the maximum value and the minimum value of the output current signal 6a. The current deviation detector 9 inputs the maximum value 8a and the minimum value 8b from the current signal calculator 8 and outputs a large deviation signal 9a when the difference between the maximum value 8a and the minimum value 8b exceeds a predetermined current deviation set value. Is output. The current level detector 10 inputs the minimum value 8b from the current signal calculator 8,
When the minimum value 8b becomes less than or equal to a preset predetermined value, the decrease signal 10a is output. The disconnection detector 11 receives the large deviation signal 9a from the current deviation detector 9 and the decrease signal 10a from the current level detector 10 to receive the large deviation signal 9a.
a and the drop signal 10a are ANDed to obtain the disconnection detection signal 11
Output a. The control circuit 7 stops the device when the disconnection detection signal 11a from the disconnection detector 11 is input.
【００１５】次に、図２を用いて、出力ケーブル断線時
の制御動作を説明する。出力ケーブル断線時は、整流器
６から出力される整流された出力電流信号６ａが低下す
る。したがって、電流信号演算器８から出力される最小
値８ｂが低下する。電流偏差検出器９に入力される最小
値８ｂが低下することで、最大値８ａと最小値８ｂの差
が大きくなって予め定めた電流偏差設定値を超え、電流
偏差検出器９は、偏差大信号９ａを出力する。また、電
流レベル検出器１０に入力される最小値８ｂも低下する
ことで、最小値８ｂが予め設定した所定値以下になり、
電流レベル検出器１０は低下信号１０ａを出力する。こ
の結果、断線検出器１１に、偏差大信号９ａと低下信号
１０ａが入力され、断線検出器１１は、これら両信号９
ａ，１０ａの論理積をとって出力ケーブルの断線（３相
の場合は欠相を含む）を検出し、断線検出信号１１ａを
出力する。そして、制御回路７には、断線検出器１１か
ら断線検出信号１１ａが入力され、運転停止動作が行わ
れる。出力電流信号６ａの最大値８ａと最小値８ｂの差
のみから、出力ケーブルの断線（又は欠相）を検出した
のでは、制御切り替えによる再始動時に誤検出するおそ
れがある。これに対し、本実施の形態では、上述したよ
うに、最小値８ｂが所定値以下になった場合も判定資料
に加味し、偏差大信号９ａと低下信号１０ａの論理積を
とることで、出力ケーブルの断線（又は欠相）を確実に
検出することができる。Next, the control operation when the output cable is broken will be described with reference to FIG. When the output cable is broken, the rectified output current signal 6a output from the rectifier 6 decreases. Therefore, the minimum value 8b output from the current signal calculator 8 decreases. As the minimum value 8b input to the current deviation detector 9 decreases, the difference between the maximum value 8a and the minimum value 8b increases and exceeds the preset current deviation set value. The signal 9a is output. Further, the minimum value 8b input to the current level detector 10 is also reduced, so that the minimum value 8b becomes equal to or less than a preset predetermined value,
The current level detector 10 outputs the drop signal 10a. As a result, the large deviation signal 9a and the decrease signal 10a are input to the disconnection detector 11, and the disconnection detector 11 receives both of these signals 9a and 9b.
The disconnection of the output cable (including the open phase in the case of three phases) is detected by taking the logical product of a and 10a, and the disconnection detection signal 11a is output. Then, the disconnection detection signal 11a is input from the disconnection detector 11 to the control circuit 7, and the operation stop operation is performed. If the disconnection (or open phase) of the output cable is detected only from the difference between the maximum value 8a and the minimum value 8b of the output current signal 6a, it may be erroneously detected at the time of restart due to control switching. On the other hand, in the present embodiment, as described above, even when the minimum value 8b becomes equal to or less than the predetermined value, it is added to the determination material, and the logical product of the large deviation signal 9a and the decrease signal 10a is taken to obtain the output. It is possible to reliably detect disconnection (or open phase) of the cable.
【００１６】図３には、本発明の第２の実施の形態を示
す。なお、図３及び後述の各実施の形態を示す図におい
て前記図１における構成要素と同一ないし均等のもの
は、前記と同一符号を以って示し、重複した説明を省略
する。本実施の形態では、整流器６と整流偏差検出器９
との間に平均値検出手段としての平均値検出器１２が接
続されている。FIG. 3 shows a second embodiment of the present invention. It should be noted that in FIG. 3 and the drawings showing the respective embodiments to be described later, the same or equivalent components as those in FIG. 1 are designated by the same reference numerals as those used above, and a duplicated description will be omitted. In the present embodiment, the rectifier 6 and the rectification deviation detector 9
An average value detector 12 serving as an average value detecting means is connected between and.
【００１７】平均値検出器１２は、整流器６からの整流
された出力電流信号６ａを入力し、その出力電流信号６
ａの平均値１２ａを算出して出力する。電流偏差検出器
９は、平均値検出器１２からの平均値１２ａを入力し、
この平均値１２ａに応じて電流偏差設定値に対して補正
（調整）を行う。負荷量が変化すると、出力電流信号６
ａの平均値が変化する。そこで、この平均値１２ａを算
出し、この平均値１２ａに応じて電流偏差設定値を補正
することで、負荷量の変化に対しても、出力ケーブルの
断線（又は欠相）を確実に検出することができる。The average value detector 12 receives the rectified output current signal 6a from the rectifier 6, and outputs the output current signal 6a.
The average value 12a of a is calculated and output. The current deviation detector 9 inputs the average value 12a from the average value detector 12,
The current deviation set value is corrected (adjusted) according to the average value 12a. When the load changes, output current signal 6
The average value of a changes. Therefore, by calculating the average value 12a and correcting the current deviation set value according to the average value 12a, the disconnection (or open phase) of the output cable can be reliably detected even when the load amount changes. be able to.
【００１８】図４には、本発明の第３の実施の形態を示
す。本実施の形態は、図１に示した電流偏差検出器９に
代えて、電流信号演算器８と断線検出器１１の間に制御
異常判断手段としての制御異常判断器１３が接続されて
いる。制御異常判断器１３は２つの出力端子を備え、一
方の出力端子は断線検出器１１に接続され、他方の出力
端子は制御回路７に接続されている。FIG. 4 shows a third embodiment of the present invention. In the present embodiment, instead of the current deviation detector 9 shown in FIG. 1, a control abnormality judging device 13 as a control abnormality judging means is connected between the current signal calculator 8 and the disconnection detector 11. The control abnormality determiner 13 has two output terminals, one output terminal is connected to the disconnection detector 11, and the other output terminal is connected to the control circuit 7.
【００１９】制御異常判断器１３は、電流信号演算器８
から出力電流信号６ａの最大値８ａと最小値８ｂを入力
し、その最大値８ａと最小値８ｂの差が予め定めた電流
偏差設定値を超え、これが一定期間継続したとき偏差大
継続信号１３ａを断線検出器１１に出力し、一定期間継
続しないときは、制御異常信号１３ｂを制御回路７に出
力する。偏差大継続信号１３ａが出力されたときは、断
線検出器１１により、この偏差大継続信号１３ａと低下
信号１０ａの論理積をとることで、出力ケーブルの断線
（又は欠相）が検出され、制御回路７により運転停止が
行われる。一方、制御異常信号１３ｂが出力されたとき
は、出力ケーブルの断線ではなく、制御上の不安定と判
断される。The control abnormality determiner 13 is a current signal calculator 8
The maximum value 8a and the minimum value 8b of the output current signal 6a are input, and the difference between the maximum value 8a and the minimum value 8b exceeds a predetermined current deviation set value, and when this continues for a certain period, the deviation large continuation signal 13a is output. When it is output to the disconnection detector 11 and does not continue for a certain period, the control abnormality signal 13b is output to the control circuit 7. When the large deviation continuation signal 13a is output, the disconnection detector 11 calculates the logical product of the large deviation continuation signal 13a and the decrease signal 10a to detect the disconnection (or open phase) of the output cable, and the control is performed. The circuit 7 shuts down. On the other hand, when the control abnormality signal 13b is output, it is determined that the output cable is not broken, and the control is unstable.
【００２０】図５には、本発明の第４の実施の形態を示
す。本実施の形態は、図１に示した電流偏差検出器９に
代えて、電流信号演算器８と断線検出器１１の間にリッ
プル周期検出手段としてのリップル周期検出器１４が接
続されている。リップル周期検出器１４は、出力線と入
力線を備え、出力線は断線検出器１１に接続され、入力
線により制御回路７から出力周波数信号７ｂを入力する
ようになっている。FIG. 5 shows a fourth embodiment of the present invention. In the present embodiment, instead of the current deviation detector 9 shown in FIG. 1, a ripple cycle detector 14 as a ripple cycle detecting means is connected between the current signal calculator 8 and the disconnection detector 11. The ripple cycle detector 14 includes an output line and an input line, the output line is connected to the disconnection detector 11, and the output frequency signal 7b is input from the control circuit 7 through the input line.
【００２１】出力ケーブルが断線（又は欠相）としたと
き、出力電流信号６ａの最大値８ａと最小値８ｂの差が
最大となるリップル周期は、出力周波数の周期以下（３
相の場合、リップル周期は出力周波数の周期の略３分の
１以下）となる。リップル周期検出器１４は、電流信号
演算器８から出力電流信号６ａの最大値８ａと最小値８
ｂを入力し、制御回路７からは出力周波数信号７ｂを入
力する。そして、最大値８ａと最小値８ｂの差が最大と
なるリップル周期と出力周波数の周期とを比較し、リッ
プル周期が出力周波数の周期に対し所定値以下となった
ときに、リップル周期検出信号１４ａを断線検出器１１
に出力する。断線検出器１１では、リップル周期検出信
号１４ａと低下信号１０ａの論理積をとることで、出力
ケーブルの断線（又は欠相）を検出し、制御回路７によ
り運転停止が行われる。When the output cable is broken (or has an open phase), the ripple cycle at which the difference between the maximum value 8a and the minimum value 8b of the output current signal 6a is maximum is less than the cycle of the output frequency (3
In the case of the phase, the ripple cycle is approximately one third or less of the cycle of the output frequency). The ripple cycle detector 14 has a maximum value 8a and a minimum value 8a of the output current signal 6a from the current signal calculator 8.
b, and the output frequency signal 7b is input from the control circuit 7. Then, the ripple cycle at which the difference between the maximum value 8a and the minimum value 8b is maximum is compared with the cycle of the output frequency, and when the ripple cycle becomes a predetermined value or less with respect to the cycle of the output frequency, the ripple cycle detection signal 14a Disconnection detector 11
Output to. The disconnection detector 11 detects the disconnection (or open phase) of the output cable by taking the logical product of the ripple cycle detection signal 14a and the drop signal 10a, and the control circuit 7 stops the operation.
【００２２】図６には、本発明の第５の実施の形態を示
す。本実施の形態は、図１に示した電流偏差検出器９に
代えて、電流信号演算器８と断線検出器１１の間にピー
ク到達時間検出手段としてのピーク到達時間検出器１５
が接続されている。ピーク到達時間検出器１５は、出力
線と入力線を備え、出力線は断線検出器１１に接続さ
れ、入力線により制御回路７から出力周波数信号７ｂを
入力するようになっている。FIG. 6 shows a fifth embodiment of the present invention. In the present embodiment, instead of the current deviation detector 9 shown in FIG. 1, a peak arrival time detector 15 as a peak arrival time detecting means is provided between the current signal calculator 8 and the disconnection detector 11.
Are connected. The peak arrival time detector 15 includes an output line and an input line, the output line is connected to the disconnection detector 11, and the output frequency signal 7b is input from the control circuit 7 through the input line.
【００２３】出力ケーブルが断線（又は欠相）したと
き、出力電流信号６ａの最大値８ａから最小値８ｂにな
るまでの時間は、出力周波数の周期以下となる。ピーク
到達時間検出器１５は、電流信号演算器８から出力電流
信号６ａの最大値８ａと最小値８ｂを入力し、制御回路
７からは出力周波数信号７ｂを入力する。そして、最大
値８ａから最小値８ｂになるまでの時間と出力周波数の
周期とを比較し、最大値８ａから最小値８ｂになるまで
の時間が出力周波数の周期に対し所定値以下となったと
きに、ピーク到達時間検出信号１５ａを断線検出器１１
に出力する。断線検出器１１では、ピーク到達時間検出
信号１５ａと低下信号１０ａの論理積をとることで、出
力ケーブルの断線（又は欠相）を検出し、制御回路７に
より運転停止が行われる。When the output cable is broken (or has a missing phase), the time from the maximum value 8a of the output current signal 6a to the minimum value 8b is less than the cycle of the output frequency. The peak arrival time detector 15 receives the maximum value 8a and the minimum value 8b of the output current signal 6a from the current signal calculator 8 and the output frequency signal 7b from the control circuit 7. Then, the time from the maximum value 8a to the minimum value 8b is compared with the cycle of the output frequency, and the time from the maximum value 8a to the minimum value 8b is less than or equal to a predetermined value with respect to the cycle of the output frequency. The peak arrival time detection signal 15a is sent to the disconnection detector 11
Output to. The disconnection detector 11 detects the disconnection (or open phase) of the output cable by taking the logical product of the peak arrival time detection signal 15a and the drop signal 10a, and the control circuit 7 stops the operation.
【００２４】図７には、本発明の第６の実施の形態を示
す。本実施の形態では、負荷として複数台の電動機３，
３，…を駆動するようになっている。FIG. 7 shows a sixth embodiment of the present invention. In the present embodiment, a plurality of electric motors 3, 3,
3, are driven.
【００２５】複数台の電動機３，３，…を駆動する場合
であっても、出力ケーブルの断線時には出力電流信号６
ａの最小値８ｂが低下するため、出力ケーブル断線を検
出することが可能である。Even when a plurality of electric motors 3, 3, ... Are driven, the output current signal 6 is output when the output cable is broken.
Since the minimum value 8b of a decreases, it is possible to detect the output cable disconnection.
【００２６】[0026]
【発明の効果】以上説明したように、請求項１〜６記載
の発明によれば、出力ケーブルが断線したとき、これを
確実に検出して運転を停止することができ、信頼性を向
上させることができる。As described above, according to the invention described in claims 1 to 6, when the output cable is broken, it is possible to reliably detect the disconnection of the output cable and stop the operation, thereby improving the reliability. be able to.
【図１】本発明の第１の実施の形態である電力変換装置
のブロック図である。FIG. 1 is a block diagram of a power conversion device according to a first embodiment of the present invention.
【図２】上記第１の実施の形態における出力ケーブル断
線時の制御動作を説明するための出力電流信号波形図で
ある。FIG. 2 is an output current signal waveform diagram for explaining a control operation when the output cable is broken in the first embodiment.
【図３】本発明の第２の実施の形態のブロック図であ
る。FIG. 3 is a block diagram of a second embodiment of the present invention.
【図４】本発明の第３の実施の形態のブロック図であ
る。FIG. 4 is a block diagram of a third embodiment of the present invention.
【図５】本発明の第４の実施の形態のブロック図であ
る。FIG. 5 is a block diagram of a fourth embodiment of the present invention.
【図６】本発明の第５の実施の形態のブロック図であ
る。FIG. 6 is a block diagram of a fifth embodiment of the present invention.
【図７】本発明の第６の実施の形態のブロック図であ
る。FIG. 7 is a block diagram of a sixth embodiment of the present invention.
【図８】従来の電力変換装置のブロック図である。FIG. 8 is a block diagram of a conventional power conversion device.
２ インバータ回路
３ 電動機
５ 変流器（電流検出手段）
６ 整流器（整流手段）
７ 制御回路（制御手段）
８ 電流信号演算器（電流信号演算手段）
９ 電流偏差検出器（電流偏差検出手段）
１０ 電流レベル検出器（電流レベル検出手段）
１１ 断線検出器（断線検出手段）
１２ 平均値検出器（平均値検出手段）
１３ 制御異常判断器（制御異常判断手段）
１４ リップル周期検出器（リップル周期検出手段）
１５ ピーク到達時間検出器（ピーク到達時間検出手
段）2 inverter circuit 3 electric motor 5 current transformer (current detecting means) 6 rectifier (rectifying means) 7 control circuit (control means) 8 current signal calculator (current signal calculating means) 9 current deviation detector (current deviation detecting means) 10 Current level detector (current level detection means) 11 Disconnection detector (disconnection detection means) 12 Average value detector (average value detection means) 13 Control abnormality determination device (control abnormality determination means) 14 Ripple cycle detector (ripple cycle detection) Means) 15 Peak arrival time detector (Peak arrival time detection means)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 柳川 昌樹 神奈川県川崎市幸区堀川町66番２ 東芝エ ンジニアリング株式会社内 Ｆターム(参考） 5G058 BB01 BC16 CC04 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masaki Yanagawa 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Engineering Co., Ltd. F term (reference) 5G058 BB01 BC16 CC04
Claims (6)
の電流検出手段で検出した出力電流信号を整流する整流
手段と、この整流した出力電流信号の最大値及び最小値
を演算する電流信号演算手段と、この電流信号演算手段
からの最大値と最小値の差が予め定めた電流偏差設定値
以上となったとき偏差大信号を出力する電流偏差検出手
段と、前記最小値が予め定めた所定値以下となったとき
低下信号を出力する電流レベル検出手段と、前記偏差大
信号と前記低下信号の論理積をとって断線検出信号を出
力する断線検出手段と、前記断線検出信号により装置動
作を停止する制御手段とを有することを特徴とする電力
変換装置。1. A current detecting means for detecting an output current, a rectifying means for rectifying an output current signal detected by the current detecting means, and a current signal calculation for calculating a maximum value and a minimum value of the rectified output current signal. Means, a current deviation detecting means for outputting a large deviation signal when the difference between the maximum value and the minimum value from the current signal calculating means is equal to or more than a predetermined current deviation set value, and the minimum value is a predetermined value. Current level detection means for outputting a drop signal when the value becomes less than or equal to a value, disconnection detection means for outputting a disconnection detection signal by ANDing the large deviation signal and the decrease signal, and device operation by the disconnection detection signal. A power conversion device comprising: a control unit that stops the power conversion.
平均値を検出する平均値検出手段と、この平均値検出手
段で検出した平均値に応じて前記電流偏差設定値を補正
することを特徴とする請求項１記載の電力変換装置。2. An average value detecting means for detecting an average value of the output current signal rectified by the rectifying means, and the current deviation set value is corrected according to the average value detected by the average value detecting means. The power conversion device according to claim 1.
の電流検出手段で検出した出力電流信号を整流する整流
手段と、この整流した出力電流信号の最大値及び最小値
を演算する電流信号演算手段と、この電流信号演算手段
からの最大値と最小値の差が予め定めた電流偏差設定値
を一定期間継続して超えたときは偏差大継続信号を出力
し、一定期間継続しないときは制御異常信号を出力する
制御異常判断手段と、前記最小値が予め定めた所定値以
下となったとき低下信号を出力する電流レベル検出手段
と、前記偏差大継続信号と前記低下信号の論理積をとっ
て断線検出信号を出力する断線検出手段と、前記断線検
出信号により装置動作を停止する制御手段とを有するこ
とを特徴とする電力変換装置。3. A current detecting means for detecting an output current, a rectifying means for rectifying an output current signal detected by the current detecting means, and a current signal operation for calculating a maximum value and a minimum value of the rectified output current signal. Means and a large deviation continuation signal is output when the difference between the maximum value and the minimum value from the current signal calculation means exceeds a predetermined current deviation set value for a certain period of time continuously, and a control is performed when the difference does not continue for a certain period of time. A control abnormality determining means for outputting an abnormality signal, a current level detecting means for outputting a decrease signal when the minimum value becomes equal to or less than a predetermined value, and a logical product of the deviation large continuation signal and the decrease signal. A power conversion device comprising: a disconnection detection means for outputting a disconnection detection signal; and a control means for stopping the operation of the device in response to the disconnection detection signal.
の電流検出手段で検出した出力電流信号を整流する整流
手段と、この整流した出力電流信号の最大値及び最小値
を演算する電流信号演算手段と、この電流信号演算手段
からの最大値と最小値の差が最大となるリップル周期と
出力周波数の周期とを比較し、前記リップル周期が前記
出力周波数の周期に対し所定値以下となったときリップ
ル周期検出信号を出力するリップル周期検出手段と、前
記最小値が予め定めた所定値以下となったとき低下信号
を出力する電流レベル検出手段と、前記リップル周期検
出信号と前記低下信号の論理積をとって断線検出信号を
出力する断線検出手段と、前記断線検出信号により装置
動作を停止する制御手段とを有することを特徴とする電
力変換装置。4. A current detecting means for detecting an output current, a rectifying means for rectifying an output current signal detected by the current detecting means, and a current signal calculation for calculating a maximum value and a minimum value of the rectified output current signal. Means and the ripple cycle that maximizes the difference between the maximum value and the minimum value from the current signal calculating means and the cycle of the output frequency, and the ripple cycle is below a predetermined value with respect to the cycle of the output frequency. When the ripple cycle detection signal is output, a ripple cycle detection means, a current level detection means that outputs a drop signal when the minimum value becomes equal to or less than a predetermined value, and a logic of the ripple cycle detection signal and the drop signal A power conversion device comprising: a disconnection detection unit that multiplies and outputs a disconnection detection signal; and a control unit that stops the device operation in response to the disconnection detection signal.
の電流検出手段で検出した出力電流信号を整流する整流
手段と、この整流した出力電流信号の最大値及び最小値
を演算する電流信号演算手段と、前記出力電流信号の最
大値から最小値までの時間と出力周波数の周期とを比較
し、前記最大値から最小値までの時間が前記出力周波数
の周期に対し所定値以下となったときピーク到達時間検
出信号を出力するピーク到達時間検出手段と、前記最小
値が予め定めた所定値以下となったとき低下信号を出力
する電流レベル検出手段と、前記ピーク到達時間検出信
号と前記低下信号の論理積をとって断線検出信号を出力
する断線検出手段と、前記断線検出信号により装置動作
を停止する制御手段とを有することを特徴とする電力変
換装置。5. A current detecting means for detecting an output current, a rectifying means for rectifying the output current signal detected by the current detecting means, and a current signal calculation for calculating a maximum value and a minimum value of the rectified output current signal. Comparing the time from the maximum value to the minimum value of the output current signal with the cycle of the output frequency, and the time from the maximum value to the minimum value is less than or equal to a predetermined value with respect to the cycle of the output frequency. Peak arrival time detection means for outputting a peak arrival time detection signal, current level detection means for outputting a decrease signal when the minimum value becomes equal to or less than a predetermined value, peak arrival time detection signal and the decrease signal A power conversion device comprising: a disconnection detection unit that outputs a disconnection detection signal by performing a logical product of the above and a control unit that stops the device operation according to the disconnection detection signal.
とを特徴とする請求項１乃至５の何れかに記載の電力変
換装置。6. The power conversion device according to claim 1, wherein a plurality of electric motors are driven as the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002106639A JP3961868B2 (en) | 2002-04-09 | 2002-04-09 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002106639A JP3961868B2 (en) | 2002-04-09 | 2002-04-09 | Power converter |
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| Publication Number | Publication Date |
|---|---|
| JP2003304634A true JP2003304634A (en) | 2003-10-24 |
| JP3961868B2 JP3961868B2 (en) | 2007-08-22 |
Family
ID=29390899
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002106639A Expired - Lifetime JP3961868B2 (en) | 2002-04-09 | 2002-04-09 | Power converter |
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| Country | Link |
|---|---|
| JP (1) | JP3961868B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007053842A (en) * | 2005-08-17 | 2007-03-01 | Fuji Electric Fa Components & Systems Co Ltd | Control device of motor |
| JP2010246328A (en) * | 2009-04-09 | 2010-10-28 | Nissan Motor Co Ltd | Fault diagnostic device for inverter |
| CN102478614A (en) * | 2010-11-30 | 2012-05-30 | 西门子公司 | Current transformer disconnection detecting method and device, and relay protecting equipment |
| US9793843B2 (en) | 2012-07-20 | 2017-10-17 | Mitsubishi Electric Corporation | Control device for detecting disconnection |
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| JPS6070920A (en) * | 1983-09-22 | 1985-04-22 | 日本電気株式会社 | Defective phase detecting circuit of 3- phase ac |
| JPS6258830A (en) * | 1985-09-03 | 1987-03-14 | 富士電機株式会社 | Missed phase detector |
| JPH04156222A (en) * | 1990-10-17 | 1992-05-28 | Daikin Ind Ltd | Inverter device |
| JPH04367356A (en) * | 1991-06-12 | 1992-12-18 | Kobe Steel Ltd | Instrument for detecting phase interruption in low frequency power source for electromagnetic stirring device |
| JPH11206003A (en) * | 1998-01-13 | 1999-07-30 | Fuji Electric Co Ltd | Inverter device |
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| JPH11275709A (en) * | 1998-03-20 | 1999-10-08 | Mitsubishi Electric Corp | Control device for vehicle |
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2002
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Patent Citations (7)
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|---|---|---|---|---|
| JPS6070920A (en) * | 1983-09-22 | 1985-04-22 | 日本電気株式会社 | Defective phase detecting circuit of 3- phase ac |
| JPS6258830A (en) * | 1985-09-03 | 1987-03-14 | 富士電機株式会社 | Missed phase detector |
| JPH04156222A (en) * | 1990-10-17 | 1992-05-28 | Daikin Ind Ltd | Inverter device |
| JPH04367356A (en) * | 1991-06-12 | 1992-12-18 | Kobe Steel Ltd | Instrument for detecting phase interruption in low frequency power source for electromagnetic stirring device |
| JPH11206003A (en) * | 1998-01-13 | 1999-07-30 | Fuji Electric Co Ltd | Inverter device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007053842A (en) * | 2005-08-17 | 2007-03-01 | Fuji Electric Fa Components & Systems Co Ltd | Control device of motor |
| JP4682746B2 (en) * | 2005-08-17 | 2011-05-11 | 富士電機システムズ株式会社 | Electric motor control device |
| JP2010246328A (en) * | 2009-04-09 | 2010-10-28 | Nissan Motor Co Ltd | Fault diagnostic device for inverter |
| CN102478614A (en) * | 2010-11-30 | 2012-05-30 | 西门子公司 | Current transformer disconnection detecting method and device, and relay protecting equipment |
| US9793843B2 (en) | 2012-07-20 | 2017-10-17 | Mitsubishi Electric Corporation | Control device for detecting disconnection |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3961868B2 (en) | 2007-08-22 |
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