JP2012120376A - Inverter device - Google Patents

Inverter device Download PDF

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JP2012120376A
JP2012120376A JP2010269500A JP2010269500A JP2012120376A JP 2012120376 A JP2012120376 A JP 2012120376A JP 2010269500 A JP2010269500 A JP 2010269500A JP 2010269500 A JP2010269500 A JP 2010269500A JP 2012120376 A JP2012120376 A JP 2012120376A
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voltage
smoothing capacitor
charging circuit
failure
detection unit
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JP5728914B2 (en
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Takahiro Yamazaki
高裕 山嵜
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Fuji Electric Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an inverter device that implements fault detection of a charge circuit in a simple configuration using no special detectors.SOLUTION: An inverter device 10 having a converter section 11 for converting an AC voltage into a DC voltage, a smoothing capacitor 12 for smoothing the DC voltage, an inverter section 13 for converting the DC voltage smoothed by the smoothing capacitor 12 into an AC voltage, a charge circuit 16 comprising a parallel circuit of a resistor 14 and a contact element 15, and a voltage detection section 17 for detecting a voltage across the smoothing capacitor 12 includes a charge circuit fault detection section 18 for detecting a short circuit fault or open circuit fault of the contact element 15 on the basis of the gradient of a voltage detection value based on a voltage detection signal detected by the voltage detection section 17.

Description

この発明は、直流電圧を平滑する平滑コンデンサと、この平滑された直流電圧を交流電圧に変換するインバータ部とを備えたインバータ装置において、平滑コンデンサを初期充電する充電回路の故障を検出する技術に関する。   The present invention relates to a technique for detecting a failure of a charging circuit that initially charges a smoothing capacitor in an inverter device including a smoothing capacitor that smoothes a DC voltage and an inverter unit that converts the smoothed DC voltage into an AC voltage. .

一般にインバータ装置においては、直流中間部に平滑コンデンサを備えている。このようなインバータ装置の起動時には、交流電源の交流電圧をコンバータ部により整流して平滑コンデンサを充電するが、電源投入直後は平滑コンデンサに電荷が充電されていないので大きな突入電流が流れる。この初期充電時の突入電流を抑制するために、抵抗器とこの抵抗器の両端を短絡するリレー等の接点要素とからなる充電回路を設けている。   In general, an inverter device includes a smoothing capacitor in a direct current intermediate portion. At the time of starting such an inverter device, the AC voltage of the AC power supply is rectified by the converter unit to charge the smoothing capacitor. However, immediately after the power is turned on, the smoothing capacitor is not charged, so a large inrush current flows. In order to suppress the inrush current during the initial charging, a charging circuit including a resistor and a contact element such as a relay that short-circuits both ends of the resistor is provided.

この充電回路の異常を検出するものとして、例えば特許文献１に示すものがある。この特許文献１には、抵抗器の通流状態を検出する通流検出器を設け、抵抗器への通流状態があらかじめ定められた充電時間を超えて一定時間以上継続する場合には充電回路の故障と判断して異常表示を行うことが記載されている。   For example, Japanese Patent Application Laid-Open No. H10-228707 discloses a method for detecting an abnormality in the charging circuit. In this Patent Document 1, a flow detector is provided for detecting a flow state of a resistor. When the flow state to the resistor exceeds a predetermined charging time and continues for a certain time or more, a charging circuit is provided. It is described that a failure is indicated and an abnormality is displayed.

特開平１０−２２５１３４号公報JP-A-10-225134

上記特許文献１では、充電回路の故障検出を行うために抵抗器の通流状態を検出する電流検出器等の通流検出器が必要であり、インバータ装置が大型化するとともに、コストアップになるという問題があった。   In Patent Document 1, a current detector such as a current detector that detects the current state of the resistor is required to detect a failure of the charging circuit, which increases the size and cost of the inverter device. There was a problem.

この発明の目的は、特別な検出器等を設けることなく、平滑コンデンサの耐圧保護などを目的として一般に設けられている既設の電圧検出器を用いて充電回路の故障検出を容易に実現することができるインバータ装置を提供することを目的とする。   An object of the present invention is to easily realize fault detection of a charging circuit using an existing voltage detector that is generally provided for the purpose of protecting a smoothing capacitor withstand voltage without providing a special detector or the like. An object of the present invention is to provide an inverter device that can be used.

上記目的を達成するために、この発明は、直流電圧を平滑する平滑コンデンサと、該平滑コンデンサにより平滑された直流電圧を交流電圧に変換するインバータ部と、抵抗器と接点要素との並列回路から構成され前記平滑コンデンサを初期充電する充電回路と、前記平滑コンデンサの両端電圧を検出する電圧検出部とを備えたインバータ装置において、前記電圧検出部で検出された電圧に基づき、所定期間内における前記電圧の変位量から前記接点要素の短絡故障または／および開放故障を検出する充電回路故障検出部を備えるものとする。   In order to achieve the above object, the present invention comprises a smoothing capacitor for smoothing a DC voltage, an inverter unit for converting the DC voltage smoothed by the smoothing capacitor into an AC voltage, and a parallel circuit of a resistor and a contact element. In an inverter device comprising a charging circuit configured to initially charge the smoothing capacitor and a voltage detection unit that detects a voltage across the smoothing capacitor, based on the voltage detected by the voltage detection unit, the predetermined period of time A charging circuit failure detection unit that detects a short-circuit failure or / and an open failure of the contact element from a voltage displacement amount is provided.

この発明によれば、抵抗器と接点要素との並列回路から構成され平滑コンデンサを初期充電する充電回路と、平滑コンデンサの両端電圧を検出する電圧検出部と、この電圧検出部で検出された電圧に基づき、所定期間内における前記電圧の変位量から接点要素の短絡故障あるいは開放故障を検出する充電回路故障検出部とを備えることにより、特別な検出器等を設けることなく、簡易な構成により充電回路の故障検出を行うことができる。   According to the present invention, a charging circuit configured by a parallel circuit of a resistor and a contact element for initially charging a smoothing capacitor, a voltage detection unit for detecting a voltage across the smoothing capacitor, and a voltage detected by the voltage detection unit And a charging circuit failure detection unit that detects a short-circuit failure or an open-circuit failure of the contact element from the amount of displacement of the voltage within a predetermined period, thereby charging with a simple configuration without providing a special detector or the like. Circuit failure detection can be performed.

この発明の実施の形態を示す回路構成図Circuit configuration diagram showing an embodiment of the present invention この発明の正常時の動作を説明するタイムチャートTime chart explaining normal operation of the present invention この発明の接点要素の短絡故障時の動作を説明するタイムチャートTime chart for explaining the operation at the time of short circuit failure of the contact element of the present invention この発明の接点要素の開放故障時の動作を説明するタイムチャートThe time chart explaining the operation at the time of open failure of the contact element of the present invention

図１はこの発明の実施の形態を示すインバータ装置の回路構成図である。図１において、１は三相の商用交流電源、２はインバータ装置１０の入力側に設けられた遮断器、３はインバータ装置１０により駆動される電動機である。   FIG. 1 is a circuit configuration diagram of an inverter device showing an embodiment of the present invention. In FIG. 1, 1 is a three-phase commercial AC power source, 2 is a circuit breaker provided on the input side of the inverter device 10, and 3 is an electric motor driven by the inverter device 10.

また、１１は交流電圧を三相全波整流するコンバータ部であり、ダイオードを三相ブリッジ接続したものである。１２は直流母線間に接続されてコンバータ部１１の出力を平滑する平滑コンデンサであり、通常は電解コンデンサが用いられている。１３は平滑コンデンサ１２の両端の平滑された直流電圧を入力として所望の周波数と電圧とをもつ交流電圧に変換するインバータ部であり、ＩＧＢＴ等の半導体スイッチング素子と還流用ダイオードとの逆並列回路を三相ブリッジ接続したものである。これらコンバータ部１１，平滑コンデンサ１２，インバータ部１３によりインバータ装置１０の主回路が構成されている。１４はコンバータ部１１と平滑コンデンサ１２との間に接続されて初期充電電流を限流するための抵抗器、１５は抵抗器１４に並列に接続されて抵抗器１４の両端を短絡するリレー等の接点要素であり、この抵抗器１４および接点要素１５により平滑コンデンサ１２を初期充電するための充電回路１６を構成している。   Reference numeral 11 denotes a converter unit for three-phase full-wave rectification of an AC voltage, which is a diode connected in a three-phase bridge. A smoothing capacitor 12 is connected between the DC buses and smoothes the output of the converter unit 11, and an electrolytic capacitor is usually used. An inverter unit 13 converts the smoothed DC voltage at both ends of the smoothing capacitor 12 into an AC voltage having a desired frequency and voltage as an input, and an antiparallel circuit of a semiconductor switching element such as an IGBT and a free wheeling diode. Three-phase bridge connection. The converter unit 11, the smoothing capacitor 12, and the inverter unit 13 constitute a main circuit of the inverter device 10. Reference numeral 14 denotes a resistor connected between the converter unit 11 and the smoothing capacitor 12 to limit the initial charging current. Reference numeral 15 denotes a relay connected in parallel to the resistor 14 to short-circuit both ends of the resistor 14. This is a contact element, and the resistor 14 and the contact element 15 constitute a charging circuit 16 for initially charging the smoothing capacitor 12.

１７は平滑コンデンサ１２の両端の直流電圧を検出する電圧検出部であり、検出した電圧検出値を電圧検出信号として送出する。なお、電圧検出部１７は平滑コンデンサ１２の耐圧保護などを目的としてインバータ装置１０に一般的に設けられているものである。１８は電圧検出部１７からの電圧検出信号に基づいて所定期間の電圧上昇の傾きを演算し、この傾きから接点要素１５の開放故障あるいは短絡故障を判定する充電回路故障検出部である。この充電回路故障検出部１８は接点要素１４を開閉するための接点信号を出力し、また接点要素１４の故障と判定した際に故障検出信号を出力する。１９はインバータ制御部であり、不図示の周波数設定器からの周波数指令値に基づいて電圧指令信号を演算し、この電圧指令信号とキャリア周波数信号との比較によるＰＷＭ演算を行ってインバータ部１３を構成する各半導体スイッチング素子をオン・オフ制御するためのＰＷＭ信号を生成する。２０は充電回路故障検出部１８が故障を検出した際の故障表示を行う表示部である。   Reference numeral 17 denotes a voltage detection unit that detects a DC voltage across the smoothing capacitor 12, and sends the detected voltage detection value as a voltage detection signal. The voltage detection unit 17 is generally provided in the inverter device 10 for the purpose of protecting the smoothing capacitor 12 withstand voltage. Reference numeral 18 denotes a charging circuit failure detection unit that calculates the slope of the voltage rise for a predetermined period based on the voltage detection signal from the voltage detection unit 17 and determines whether the contact element 15 is open or short-circuited based on this slope. The charging circuit failure detection unit 18 outputs a contact signal for opening and closing the contact element 14, and outputs a failure detection signal when it is determined that the contact element 14 has failed. Reference numeral 19 denotes an inverter control unit that calculates a voltage command signal based on a frequency command value from a frequency setter (not shown), performs a PWM calculation by comparing the voltage command signal and the carrier frequency signal, and controls the inverter unit 13. A PWM signal for on / off control of each semiconductor switching element to be configured is generated. Reference numeral 20 denotes a display unit that displays a failure when the charging circuit failure detection unit 18 detects a failure.

このような構成において、図２を参照しながら充電回路１６が正常時の初期充電動作を説明する。   In such a configuration, an initial charging operation when the charging circuit 16 is normal will be described with reference to FIG.

インバータ装置１０を起動する際、時刻ｔ０において遮断器２が閉路されて商用交流電源１が投入されると、交流電圧がコンバータ部１１により整流されて平滑コンデンサ１２の初期充電が開始される。このとき接点要素１５は開放されているので、平滑コンデンサ１２には抵抗器１４を介して抑制された充電電流が流れ、抵抗器１４と平滑コンデンサ１２の時定数で決まる時間で平滑コンデンサ１２の電圧が上昇する。   When starting the inverter device 10, when the circuit breaker 2 is closed and the commercial AC power supply 1 is turned on at time t 0, the AC voltage is rectified by the converter unit 11 and the initial charging of the smoothing capacitor 12 is started. At this time, since the contact element 15 is open, the charging current suppressed through the resistor 14 flows through the smoothing capacitor 12, and the voltage of the smoothing capacitor 12 is determined by the time determined by the time constant of the resistor 14 and the smoothing capacitor 12. Rises.

次に、時刻ｔ１において平滑コンデンサ１２の両端電圧が所定の電圧Ｖ１（例えば、初期充電完了後のピーク充電電圧の８０％程度にあらかじめ設定した値）に達すると、あらかじめ定めた所定時間Ｔ１が経過した後の時刻ｔ２における電圧を電圧検出部１７で検出し、充電回路故障検出部１８により時刻ｔ１での電圧検出信号に基づく電圧検出値と時刻ｔ２での電圧検出信号に基づく電圧検出値とから時刻ｔ１−ｔ２間の電圧上昇の傾きを演算する。この演算した傾きがあらかじめ設定されている第１の基準値未満のときは充電回路１６が正常と判断（接点要素１５が短絡故障していないと判断）するとともに、接点信号をＯＮにして接点要素１５を閉路して抵抗器１４を短絡することによって平滑コンデンサ１２を完全に充電する。このとき充電回路故障検出部１８からの故障検出信号はＯＦＦのままである。   Next, when the voltage across the smoothing capacitor 12 reaches a predetermined voltage V1 (for example, a value set in advance to about 80% of the peak charge voltage after completion of the initial charging) at time t1, a predetermined time T1 has elapsed. The voltage at time t2 after detection is detected by the voltage detection unit 17, and the charging circuit failure detection unit 18 detects the voltage detection value based on the voltage detection signal at time t1 and the voltage detection value based on the voltage detection signal at time t2. The slope of the voltage rise between times t1 and t2 is calculated. When the calculated inclination is less than a preset first reference value, it is determined that the charging circuit 16 is normal (determined that the contact element 15 is not short-circuited), and the contact signal is turned ON to turn on the contact element. The smoothing capacitor 12 is fully charged by closing 15 and shorting the resistor 14. At this time, the failure detection signal from the charging circuit failure detection unit 18 remains OFF.

次に、充電回路故障検出部１８では、時刻ｔ２からあらかじめ定めた所定時間Ｔ２が経過した後の時刻ｔ３において時刻ｔ２−ｔ３間の電圧上昇の傾きを時刻ｔ２およびｔ３での電圧検出信号に基づいて演算する。この演算した傾きがあらかじめ設定した第２の基準値以上のときは充電回路１６が正常と判断（接点要素１５が開放故障していないと判断）する。このときも充電回路故障検出部１８からの故障検出信号はＯＦＦのままである。なお、上述の第１の基準値と第２の基準値は同じ値にしてもよいし、それぞれ別の値にしてもよい。   Next, the charging circuit failure detection unit 18 determines the slope of voltage increase between time t2 and t3 at time t3 after a predetermined time T2 has elapsed from time t2 based on the voltage detection signals at time t2 and t3. To calculate. When the calculated inclination is equal to or greater than a second reference value set in advance, it is determined that the charging circuit 16 is normal (determined that the contact element 15 is not open failure). Also at this time, the failure detection signal from the charging circuit failure detection unit 18 remains OFF. The first reference value and the second reference value described above may be the same value or different values.

その後、あらかじめ定めた所定時間Ｔ３が経過した後の時刻ｔ４において運転信号がＯＦＦからＯＮになるが、このときの故障検出信号はＯＦＦであるので、ＰＷＭ信号がＯＮになる。インバータ制御部１９ではＰＷＭ信号を生成し、このＰＷＭ信号に従ってインバータ部１３を構成する各半導体スイッチング素子をオン・オフ制御することにより、インバータ装置１０の出力電圧がその指令値に一致するような制御が行われる。   Thereafter, the operation signal is turned from OFF to ON at time t4 after a predetermined time T3 elapses in advance. Since the failure detection signal at this time is OFF, the PWM signal is turned ON. The inverter control unit 19 generates a PWM signal, and controls each semiconductor switching element constituting the inverter unit 13 according to the PWM signal so that the output voltage of the inverter device 10 matches the command value. Is done.

次に、図３を参照しながら充電回路１６が故障時（接点要素１５の短絡故障時）の動作を説明する。   Next, the operation when the charging circuit 16 fails (when the short-circuit failure of the contact element 15) occurs will be described with reference to FIG.

時刻ｔ０において遮断器２が閉路され商用交流電源１が投入されると、コンバータ部１１を介して平滑コンデンサ１２の初期充電が開始される。ここで接点要素１５が溶着するなどして短絡故障している場合、遮断器２を閉路すると平滑コンデンサ１２の両端電圧が急峻に上昇する。   When the circuit breaker 2 is closed and the commercial AC power supply 1 is turned on at time t0, initial charging of the smoothing capacitor 12 is started via the converter unit 11. Here, when the contact element 15 is welded or the like and a short-circuit failure occurs, when the circuit breaker 2 is closed, the voltage across the smoothing capacitor 12 rises sharply.

次に、時刻ｔ１１において平滑コンデンサ１２の両端電圧が所定の電圧Ｖ１に達すると、あらかじめ定めた所定時間Ｔ１が経過した後の時刻ｔ１２での電圧を電圧検出部１７で検出し、充電回路故障検出部１８により時刻ｔ１１の電圧検出信号に基づく電圧検出値と時刻ｔ１２の電圧検出信号に基づく電圧検出値とから時刻ｔ１１−ｔ１２間の電圧上昇の傾きを演算する。この演算した傾きが第１の基準値以上のときは充電回路１６の故障と判断（接点要素１５が短絡故障と判断）し、故障検出信号をインバータ制御回路１９に出力する。そしてインバータ制御回路１９からアラーム信号を出力し、表示部２０に充電回路１６の故障を表示する。   Next, when the voltage between both ends of the smoothing capacitor 12 reaches the predetermined voltage V1 at time t11, the voltage detection unit 17 detects the voltage at time t12 after a predetermined time T1 elapses to detect the charging circuit failure. The slope of the voltage rise between time t11 and t12 is calculated by the unit 18 from the voltage detection value based on the voltage detection signal at time t11 and the voltage detection value based on the voltage detection signal at time t12. When the calculated slope is equal to or greater than the first reference value, it is determined that the charging circuit 16 is faulty (the contact element 15 is judged to be a short-circuit fault), and a fault detection signal is output to the inverter control circuit 19. Then, an alarm signal is output from the inverter control circuit 19 and a failure of the charging circuit 16 is displayed on the display unit 20.

その後、時刻ｔ１４において運転信号がＯＦＦからＯＮになるが、充電回路故障検出部１８からの故障検出信号がＯＮのため、ＰＷＭ信号はＯＦＦとなりインバータ装置１０を停止する。   Thereafter, the operation signal is turned from OFF to ON at time t14. However, since the failure detection signal from the charging circuit failure detection unit 18 is ON, the PWM signal is turned OFF and the inverter device 10 is stopped.

なお、故障判定の精度を向上させるために、時刻ｔ１２で接点信号をＯＮにし、この時刻ｔ１２の前後の電圧検出信号の値から電圧上昇の傾きを充電回路故障検出部１８で演算し、この演算した傾きから充電回路１６の故障を判断するシーケンスを追加するようにしてもよい。このとき、電圧上昇の傾きに変化がなければ充電回路１６の短絡故障と判断し、電圧上昇の傾きに変化があれば充電回路１６が正常と判断する。   In order to improve the accuracy of the failure determination, the contact signal is turned on at time t12, and the charging circuit failure detection unit 18 calculates the slope of the voltage rise from the voltage detection signal values before and after this time t12. A sequence for determining a failure of the charging circuit 16 from the slope may be added. At this time, if there is no change in the voltage increase slope, it is determined that the charging circuit 16 is short-circuited. If there is a change in the voltage increase slope, it is determined that the charging circuit 16 is normal.

また、充電回路故障検出部１８が充電回路１６の短絡故障と判断した場合、遮断器信号に基づいて遮断器２を開路する機能を備えることによって、より安全にインバータ装置１０の保護を行うことができる。   Further, when the charging circuit failure detection unit 18 determines that the charging circuit 16 is short-circuited, the inverter device 10 can be protected more safely by providing a function of opening the circuit breaker 2 based on the circuit breaker signal. it can.

次に、図４を参照しながら充電回路１６が故障時（接点要素１５の開放故障時）の動作を説明する。   Next, the operation when the charging circuit 16 fails (when the contact element 15 is open) will be described with reference to FIG.

時刻ｔ０において遮断器２が閉路され商用交流電源１が投入されると、コンバータ部１１を介して平滑コンデンサ１２の初期充電が開始される。このとき接点要素１５は開放されており、抵抗器１４と平滑コンデンサ１２の時定数で決まる時間で平滑コンデンサ１２の両端電圧が上昇する。   When the circuit breaker 2 is closed and the commercial AC power supply 1 is turned on at time t0, initial charging of the smoothing capacitor 12 is started via the converter unit 11. At this time, the contact element 15 is opened, and the voltage across the smoothing capacitor 12 rises in a time determined by the time constant of the resistor 14 and the smoothing capacitor 12.

次に、時刻ｔ２１において平滑コンデンサ１２の両端電圧が所定の電圧Ｖ１に達すると、あらかじめ定めた所定時間Ｔ１が経過した後の時刻ｔ２２での電圧を電圧検出部１７で検出し、充電回路故障検出部１８により時刻ｔ２１の電圧検出信号に基づく電圧検出値と時刻ｔ２２の電圧検出信号に基づく電圧検出値とから時刻ｔ２１−ｔ２２間の電圧上昇の傾きを演算する。この演算した傾きが第１の基準値未満のときは充電回路１６が正常と判断（接点要素１５が短絡故障していないと判断）し、接点信号をＯＮにする。このとき充電回路故障検出部１８からの故障検出信号はＯＦＦのままである。   Next, when the voltage between both ends of the smoothing capacitor 12 reaches the predetermined voltage V1 at time t21, the voltage detection unit 17 detects the voltage at time t22 after the predetermined time T1 elapses, thereby detecting the charging circuit failure. The slope of the voltage rise between time t21 and t22 is calculated by the unit 18 from the voltage detection value based on the voltage detection signal at time t21 and the voltage detection value based on the voltage detection signal at time t22. When the calculated inclination is less than the first reference value, it is determined that the charging circuit 16 is normal (determined that the contact element 15 is not short-circuited), and the contact signal is turned ON. At this time, the failure detection signal from the charging circuit failure detection unit 18 remains OFF.

ここで何らかの原因で接点要素１５が開放したまま閉路できない故障が発生した場合、抵抗器１４の両端が短絡できないために抵抗器１４に電流が流れ続け、平滑コンデンサ１２の両端電圧は時刻ｔ２２以前と同様に抵抗器１４と平滑コンデンサ１２の時定数で決まる時間でゆっくりと上昇する。次に、あらかじめ定めた所定時間Ｔ２が経過した後の時刻ｔ２３において、時刻ｔ２２およびｔ２３での電圧検出信号に基づいて時刻ｔ２２−ｔ２３間の電圧上昇の傾きを充電回路故障検出部１８で演算する。この演算した傾きが第２の基準値未満のときは充電回路１６が故障と判断（接点要素１５が開放故障と判断）し、充電回路故障検出部１８がインバータ制御回路１９に故障検出信号を出力する。そしてインバータ制御回路１９からアラーム信号を出力し、表示部２０に充電回路１６の故障を表示する。   Here, when a failure that cannot be closed with the contact element 15 opened for some reason occurs, both ends of the resistor 14 cannot be short-circuited, so that the current continues to flow through the resistor 14, and the voltage across the smoothing capacitor 12 is Similarly, it rises slowly at a time determined by the time constant of the resistor 14 and the smoothing capacitor 12. Next, at time t23 after a predetermined time T2 has elapsed in advance, the charging circuit failure detection unit 18 calculates the slope of the voltage increase between times t22 and t23 based on the voltage detection signals at times t22 and t23. . When the calculated slope is less than the second reference value, it is determined that the charging circuit 16 has failed (the contact element 15 has been determined to be open), and the charging circuit failure detector 18 outputs a failure detection signal to the inverter control circuit 19. To do. Then, an alarm signal is output from the inverter control circuit 19 and a failure of the charging circuit 16 is displayed on the display unit 20.

その後、時刻ｔ２４において運転信号がＯＦＦからＯＮになるが、充電回路故障検出部１８からの故障検出信号がＯＮのため、ＰＷＭ信号はＯＦＦとなりインバータ装置１０を停止する。   Thereafter, the operation signal is switched from OFF to ON at time t24. However, since the failure detection signal from the charging circuit failure detection unit 18 is ON, the PWM signal is turned OFF and the inverter device 10 is stopped.

なお、充電回路故障検出部１８が充電回路１６の開放故障と判断した場合、遮断器信号により遮断器２を開路する機能を備えることによって、より安全にインバータ装置１０の保護を行うことができる。   When the charging circuit failure detection unit 18 determines that the charging circuit 16 is an open failure, the inverter device 10 can be protected more safely by providing a function of opening the circuit breaker 2 with a circuit breaker signal.

また、上記実施の形態においては、所定期間内における前記電圧の変位量として、所定期間内の電圧上昇の傾きを演算して充電回路の故障を判断するようにしているが、所定期間内の電圧上昇値（偏差）から充電回路の故障を判断するようにしてもよい。   Further, in the above embodiment, as the amount of displacement of the voltage within a predetermined period, the slope of the voltage rise within the predetermined period is calculated to determine the failure of the charging circuit. A failure of the charging circuit may be determined from the increased value (deviation).

以上のように、本発明によれば、平滑コンデンサ１２の初期充電時に電圧検出部１７で検出された電圧検出信号に基づく電圧検出値の所定期間内における電圧の変位量から接点要素１５の短絡故障あるいは開放故障を検出する充電回路故障検出部１８を備えることにより、平滑コンデンサ１２の耐圧保護などを目的として一般に設けられている既設の電圧検出部１７のみを用いて充電回路１６の故障の検出を容易に実現し、抵抗器１４の異常発熱による焼損等の二次故障を防止することができる。   As described above, according to the present invention, the short-circuit failure of the contact element 15 from the voltage displacement amount within a predetermined period of the voltage detection value based on the voltage detection signal detected by the voltage detection unit 17 at the initial charging of the smoothing capacitor 12. Alternatively, by providing the charging circuit failure detection unit 18 that detects an open failure, the failure detection of the charging circuit 16 is detected using only the existing voltage detection unit 17 that is generally provided for the purpose of protecting the smoothing capacitor 12 withstand voltage. It can be easily realized and secondary failure such as burning due to abnormal heat generation of the resistor 14 can be prevented.

１０…インバータ装置、１１…コンバータ部、１２…平滑コンデンサ、１３…インバータ部、１４…抵抗器、１５…接点要素、１６…充電回路、１７…電圧検出部、１８…充電回路故障検出部、１９…インバータ制御部、２０…表示部。   DESCRIPTION OF SYMBOLS 10 ... Inverter apparatus, 11 ... Converter part, 12 ... Smoothing capacitor, 13 ... Inverter part, 14 ... Resistor, 15 ... Contact element, 16 ... Charging circuit, 17 ... Voltage detection part, 18 ... Charging circuit failure detection part, 19 ... inverter control unit, 20 ... display unit.

Claims (5)

直流電圧を平滑する平滑コンデンサと、該平滑コンデンサにより平滑された直流電圧を交流電圧に変換するインバータ部と、抵抗器と接点要素との並列回路から構成され前記平滑コンデンサを初期充電する充電回路と、前記平滑コンデンサの両端電圧を検出する電圧検出部とを備えたインバータ装置において、
前記電圧検出部で検出された電圧に基づき、所定期間内における前記電圧の変位量から前記接点要素の短絡故障を検出する充電回路故障検出部を備えたことを特徴とするインバータ装置。 A smoothing capacitor for smoothing the DC voltage, an inverter unit for converting the DC voltage smoothed by the smoothing capacitor into an AC voltage, and a charging circuit for initially charging the smoothing capacitor, comprising a parallel circuit of a resistor and a contact element; In the inverter device comprising a voltage detection unit for detecting the voltage across the smoothing capacitor,
An inverter device comprising: a charging circuit failure detection unit that detects a short-circuit failure of the contact element from a displacement amount of the voltage within a predetermined period based on a voltage detected by the voltage detection unit. 直流電圧を平滑する平滑コンデンサと、該平滑コンデンサにより平滑された直流電圧を交流電圧に変換するインバータ部と、抵抗器と接点要素との並列回路から構成され前記平滑コンデンサを初期充電する充電回路と、前記平滑コンデンサの両端電圧を検出する電圧検出部とを備えたインバータ装置において、
前記電圧検出部で検出された電圧に基づき、所定期間内における前記電圧の変位量から前記接点要素の開放故障を検出する充電回路故障検出部を備えたことを特徴とするインバータ装置。 A smoothing capacitor for smoothing the DC voltage, an inverter unit for converting the DC voltage smoothed by the smoothing capacitor into an AC voltage, and a charging circuit for initially charging the smoothing capacitor, comprising a parallel circuit of a resistor and a contact element; In the inverter device comprising a voltage detection unit for detecting the voltage across the smoothing capacitor,
An inverter device comprising: a charging circuit failure detection unit that detects an open failure of the contact element from a displacement amount of the voltage within a predetermined period based on a voltage detected by the voltage detection unit. 直流電圧を平滑する平滑コンデンサと、該平滑コンデンサにより平滑された直流電圧を交流電圧に変換するインバータ部と、抵抗器と接点要素との並列回路から構成され前記平滑コンデンサを初期充電する充電回路と、前記平滑コンデンサの両端電圧を検出する電圧検出部とを備えたインバータ装置において、
前記電圧検出部で検出された電圧に基づき、所定期間内における前記電圧の変位量から前記接点要素の開放故障および短絡故障を検出する充電回路故障検出部を備えたことを特徴とするインバータ装置。 A smoothing capacitor for smoothing the DC voltage, an inverter unit for converting the DC voltage smoothed by the smoothing capacitor into an AC voltage, and a charging circuit for initially charging the smoothing capacitor, comprising a parallel circuit of a resistor and a contact element; In the inverter device comprising a voltage detection unit for detecting the voltage across the smoothing capacitor,
An inverter device comprising: a charging circuit failure detection unit that detects an open failure and a short-circuit failure of the contact element from a displacement amount of the voltage within a predetermined period based on a voltage detected by the voltage detection unit. 請求項１〜３のいずれか１項に記載のインバータ装置において、前記充電回路故障検出部が故障を検出した際に、インバータの運転を停止し、前記充電回路の故障を表示部に表示することを特徴とするインバータ装置。   The inverter device according to any one of claims 1 to 3, wherein when the charging circuit failure detection unit detects a failure, the operation of the inverter is stopped and the failure of the charging circuit is displayed on the display unit. An inverter device characterized by. 請求項１〜４のいずれか１項に記載のインバータ装置において、前記充電回路故障検出部が故障を検出した際に、当該インバータ装置の入力側に設けられた遮断器を開放することを特徴とするインバータ装置。   5. The inverter device according to claim 1, wherein when the charging circuit failure detection unit detects a failure, a circuit breaker provided on an input side of the inverter device is opened. Inverter device.
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