WO2011151906A1 - Inverter apparatus - Google Patents

Inverter apparatus Download PDF

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Publication number
WO2011151906A1
WO2011151906A1 PCT/JP2010/059391 JP2010059391W WO2011151906A1 WO 2011151906 A1 WO2011151906 A1 WO 2011151906A1 JP 2010059391 W JP2010059391 W JP 2010059391W WO 2011151906 A1 WO2011151906 A1 WO 2011151906A1
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Prior art keywords
inrush current
film capacitor
current suppression
temperature
converter unit
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PCT/JP2010/059391
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French (fr)
Japanese (ja)
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勇樹 河内
昌則 加藤
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三菱電機株式会社
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Priority to PCT/JP2010/059391 priority Critical patent/WO2011151906A1/en
Priority to TW099126442A priority patent/TWI426688B/en
Publication of WO2011151906A1 publication Critical patent/WO2011151906A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature

Definitions

  • the present invention relates to an inverter device, and more particularly to an inverter device using a film capacitor as a smoothing capacitor.
  • a smoothing capacitor that smoothes a ripple component that appears in a DC bus current is connected between the DC buses.
  • a large-capacity electrolytic capacitor is used as the smoothing capacitor, harmonic components in the DC bus current increase. Therefore, an inverter device using a small-capacity film capacitor as a smoothing capacitor is known for the purpose of suppressing the harmonic component.
  • the film capacitor when a film capacitor is used as the smoothing capacitor connected between the DC buses of the inverter device, the film capacitor has a characteristic that the internal resistance increases with the progress of deterioration due to overvoltage or aging. Heating burnout damage occurs due to increasing internal resistance. Therefore, an inverter device using a film capacitor as a smoothing capacitor requires a circuit that protects the film capacitor from heat burnout damage due to deterioration.
  • Patent Document 1 proposes a method in which the temperature of a film capacitor is detected by a thermistor to determine deterioration and the output operation of the inverter device is stopped.
  • simply stopping the output operation of the inverter device does not protect the film capacitor because the converter output current always flows through the film capacitor.
  • Patent Document 2 proposes a method in which the temperature of a film capacitor is detected by a thermistor to determine deterioration, and the inverter device is disconnected from the AC power supply.
  • the method of providing an open / close switch on the power input side of the inverter device requires a separate control circuit, resulting in an increase in cost.
  • an overvoltage protection circuit for detecting an overvoltage of the DC bus is provided, and a switch is provided in parallel with the film capacitor.
  • the switch is closed to connect the Short circuit protects film capacitor.
  • an inrush current suppression resistor is overloaded (burned out) by a flowing inrush current to interrupt the converter and the film capacitor.
  • the present invention has been made in view of the above, and an object of the present invention is to provide an inverter device including a protection circuit that can reliably avoid heat burnout damage due to deterioration of a film capacitor used in a smoothing capacitor with an inexpensive configuration.
  • the present invention is a converter unit that converts an AC power source into a DC power source, and an inrush current suppression circuit in which an inrush current suppression relay and an inrush current suppression resistor are connected in parallel.
  • An inrush current suppression circuit having one end connected to the positive output end of the converter unit, a positive bus connected to the other end of the inrush current suppression circuit, and a negative bus connected to the negative output end of the converter unit
  • an inverter device comprising a film capacitor that is a smoothing capacitor connected in between, a temperature detection means for detecting the temperature of the film capacitor, and a detection temperature and a determination temperature output by the temperature detection means are compared, While the detected temperature is lower than the judgment temperature, the inrush current suppression relay is turned on. When the detected temperature exceeds the judgment temperature, the inrush current suppression relay is turned off. And a controlling means for controlling.
  • the temperature that has increased due to the deterioration of the film capacitor is determined as the determination temperature. Becomes higher, the current path is switched to a path via the inrush current suppression resistor. As a result, the inrush current suppression resistor is disconnected by Joule heat, the output current of the converter unit is blocked from flowing into the film capacitor, and the film capacitor is protected from heat burnout damage due to deterioration.
  • FIG. 1 is a block diagram showing a configuration of an inverter device according to an embodiment of the present invention.
  • FIG. 2 is a diagram for explaining the positional relationship between a film capacitor, which is a smoothing capacitor, and a thermistor.
  • FIG. 3 is a diagram illustrating the converter output current path when the inrush current suppression relay is on.
  • FIG. 4 is a diagram illustrating the converter output current path when the inrush current suppression relay is off.
  • FIG. 1 is a block diagram showing a configuration of an inverter device according to an embodiment of the present invention.
  • an inverter device 1 includes a thermistor in a general inverter device including a converter unit 11, an inrush current suppression circuit 12, a smoothing capacitor 13 formed of a film capacitor, a main circuit unit 14, and a control unit 15. 16 is added, and the function of protecting the smoothing capacitor (film capacitor) 13 is added to the control unit 15.
  • the smoothing capacitor 13 is referred to as a film capacitor 13.
  • the converter unit 11 is configured by a diode bridge, and converts the three-phase AC power source 2 into DC power.
  • the positive output terminal of the converter unit 11 is connected to one end of the inrush current suppression circuit 12, and the negative output terminal of the converter unit 11 is directly connected to the negative input terminal of the main circuit unit 14.
  • the inrush current suppression circuit 12 includes an inrush current suppression resistor 12a and an inrush current suppression relay 12b connected in parallel.
  • the inrush current suppression relay 12 b is on / off controlled by the control unit 15.
  • the other end of the inrush current suppression circuit 12 is connected to the positive input terminal of the main circuit unit 14.
  • the film capacitor 13 has one end connected to the positive bus connecting the other end of the inrush current suppression circuit 12 and the positive input end of the main circuit unit 14, and the other end connected to the negative output end of the converter unit 11 and the main circuit unit 14.
  • the output power of the converter unit 11 is smoothed by being connected to the negative electrode bus that connects the negative input terminal.
  • the main circuit unit 14 includes a switching circuit having a switching element in which flywheel diodes are connected in antiparallel, and switches the charging voltage (DC power supply) of the film capacitor 13 with a PWM drive signal supplied from the control unit 15 to induce the circuit. Conversion to AC power for driving the electric motor 3 is performed.
  • the thermistor 16 which is an example of the temperature detecting means is disposed in the vicinity of the film capacitor 13, and the temperature information of the film capacitor 13 detected by the thermistor 16 is input to the control unit 15.
  • the control unit 15 is added with a function of control means for performing on / off control of the inrush current suppression relay 12b based on the temperature detected by the thermistor 16. That is, the control unit 15 performs on / off control of the inrush current suppression relay 12b based on another parameter such as the magnitude of the inrush current in the general configuration described above.
  • FIG. 2 is a diagram for explaining the positional relationship between a film capacitor, which is a smoothing capacitor, and a thermistor.
  • the thermistor 16 is disposed in the vicinity of the film capacitor 13. Specifically, the thermistor 16 is bonded to the film capacitor 13 by a bonding material 17 as shown in FIG. As a result, the thermistor 16 can accurately detect the outer peripheral surface temperature of the film capacitor 13.
  • FIG. 3 is a diagram illustrating the converter output current path when the inrush current suppression relay is on.
  • FIG. 4 is a diagram illustrating the converter output current path when the inrush current suppression relay is off.
  • the control unit 15 turns off the inrush current suppression relay 12b.
  • the output current of the converter unit 11 flows through a path 21 extending from the positive output terminal of the converter unit 11 to the inrush current suppression resistor 12a ⁇ the film capacitor 13 ⁇ the negative output terminal of the converter unit 11, as shown in FIG. .
  • the input current when the three-phase AC power supply 2 is turned on is suppressed by the inrush current suppressing resistor 12a.
  • the controller 15 immediately turns on the inrush current suppression relay 12b when the inrush current becomes a predetermined value or less. And the control part 15 compares the temperature information of the film capacitor
  • the film capacitor 13 is performing a desired smoothing operation.
  • the film capacitor 13 is changed according to the number of times the three-phase AC power supply 2 is turned on and off and the length of the operation time of the inverter device 1. Deterioration that becomes a problem progresses and internal resistance increases. As the internal resistance increases, the temperature of the film capacitor 13 increases, so that the detection temperature of the thermistor 16 increases.
  • the control unit 15 When the detected temperature from the thermistor 16 exceeds the determination temperature, the control unit 15 immediately turns off the inrush current suppression relay 12b. As a result, the output current of the converter unit 11 flows through a path 21 extending from the positive output terminal of the converter unit 11 to the inrush current suppression resistor 12a ⁇ the film capacitor 13 ⁇ the negative output terminal of the converter unit 11, as shown in FIG. .
  • the control unit 15 continues to turn off the inrush current suppression relay 12b, the output current of the converter unit 11 continues to flow through the inrush current suppression resistor 12a.
  • the inrush current suppression resistor 12a is melted (overloaded disconnection) by Joule heat, and the output current of the converter unit 11 is blocked from flowing into the film capacitor 13.
  • the main circuit 14 is disconnected from the converter unit 11 and stops the output operation to the induction motor 3.
  • an inverter device can be obtained by simply adding a thermistor for detecting the temperature of the film capacitor to the protection circuit capable of avoiding heat burnout damage due to deterioration of the film capacitor used in the smoothing capacitor.
  • the control unit and the inrush current suppression circuit that are installed from the beginning can be easily realized with an inexpensive configuration.
  • the inrush current suppression resistor can be selected to have a small resistance value that is easy to cause overload disconnection.
  • the inverter device according to the present invention is useful as an inverter device that can reliably avoid heat burnout damage due to deterioration of a film capacitor used for a smoothing capacitor with an inexpensive configuration.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

Provided is an inverter apparatus, wherein, when the inverter is in operation whereupon a current path whereby the output current of a converter unit (11) flows into a film capacitor (13) is formed so as to pass through an inrush current restraining relay (12b), and when deterioration of the film capacitor (13) progresses and the temperature thereof becomes higher than an evaluation temperature, the current path is switched to a path passing through an inrush current restraining resistor (12a). As a result, the inrush current restraining resistor (12a) will break due to Joule heat, and the output current of the converter unit (11) is cut off from flowing into the film capacitor (13), and the film capacitor (13) is thus protected from heat-generation burnout damage caused by deterioration thereof.

Description

インバータ装置Inverter device
　本発明は、インバータ装置に関し、特に平滑コンデンサにフィルムコンデンサを使用するインバータ装置に関するものである。 The present invention relates to an inverter device, and more particularly to an inverter device using a film capacitor as a smoothing capacitor.
　スイッチング回路を有する主回路の直流電源を生成するコンバータがダイオードブリッジで構成されるインバータ装置では、直流母線電流に現れるリップル成分を平滑する平滑コンデンサが直流母線間に接続される。この平滑コンデンサに大容量の電解コンデンサを使用すると、直流母線電流中の高調波成分が増大する。そこで、その高調波成分の抑制を目的として、平滑コンデンサに小容量のフィルムコンデンサを使用したインバータ装置が知られている。 In an inverter device in which a converter that generates a DC power supply of a main circuit having a switching circuit is formed of a diode bridge, a smoothing capacitor that smoothes a ripple component that appears in a DC bus current is connected between the DC buses. When a large-capacity electrolytic capacitor is used as the smoothing capacitor, harmonic components in the DC bus current increase. Therefore, an inverter device using a small-capacity film capacitor as a smoothing capacitor is known for the purpose of suppressing the harmonic component.
　ところが、インバータ装置の直流母線間に接続する平滑コンデンサにフィルムコンデンサを使用した場合、フィルムコンデンサは、過電圧や経年などによる劣化の進行に伴って内部抵抗が増大する特性を有しているので、その増大する内部抵抗により発熱焼損破損することが起こる。したがって、平滑コンデンサにフィルムコンデンサを使用するインバータ装置では、フィルムコンデンサを劣化による発熱焼損破損から保護する回路が必要である。 However, when a film capacitor is used as the smoothing capacitor connected between the DC buses of the inverter device, the film capacitor has a characteristic that the internal resistance increases with the progress of deterioration due to overvoltage or aging. Heating burnout damage occurs due to increasing internal resistance. Therefore, an inverter device using a film capacitor as a smoothing capacitor requires a circuit that protects the film capacitor from heat burnout damage due to deterioration.
特開２００８－６１４７６号公報JP 2008-61476 A 特開２００９－２７２２３３号公報JP 2009-272233 A 特開２００８－１７６２６号公報JP 2008-17626 A
　この問題に対して、例えば、特許文献１では、フィルムコンデンサの温度をサ－ミスタにより検出して劣化を判定し、インバータ装置の出力動作を停止させる方法が提案されている。しかし、インバータ装置の出力動作を停止させるだけでは、フィルムコンデンサには常にコンバータ出力電流が流れるので、フィルムコンデンサの保護にはならない。 For this problem, for example, Patent Document 1 proposes a method in which the temperature of a film capacitor is detected by a thermistor to determine deterioration and the output operation of the inverter device is stopped. However, simply stopping the output operation of the inverter device does not protect the film capacitor because the converter output current always flows through the film capacitor.
　また、特許文献２では、フィルムコンデンサの温度をサ－ミスタにより検出して劣化を判定し、インバータ装置を交流電源から切り離す方法が提案されている。しかし、インバータ装置の電源入力側に開閉スイッチを設ける方法では、別途制御回路が必要であり、コストアップを招来する。 Further, Patent Document 2 proposes a method in which the temperature of a film capacitor is detected by a thermistor to determine deterioration, and the inverter device is disconnected from the AC power supply. However, the method of providing an open / close switch on the power input side of the inverter device requires a separate control circuit, resulting in an increase in cost.
　さらに、特許文献３では、直流母線の過電圧を検出する過電圧保護回路を設けるとともに、フィルムコンデンサと並列にスイッチを設け、過電圧保護回路が直流母線の過電圧を検出すると、スイッチを閉じて直流母線間を短絡させフィルムコンデンサを保護する。同時に、流れる突入電流によって突入電流抑制抵抗器を過負荷断線（焼損）させてコンバータとフィルムコンデンサとの間を遮断する方法が提案されている。しかし、この方法では、付加要素が多く、過電圧保護回路の構成が複雑であり、コストアップを招来する。 Further, in Patent Document 3, an overvoltage protection circuit for detecting an overvoltage of the DC bus is provided, and a switch is provided in parallel with the film capacitor. When the overvoltage protection circuit detects an overvoltage of the DC bus, the switch is closed to connect the Short circuit protects film capacitor. At the same time, a method has been proposed in which an inrush current suppression resistor is overloaded (burned out) by a flowing inrush current to interrupt the converter and the film capacitor. However, in this method, there are many additional elements, the configuration of the overvoltage protection circuit is complicated, and the cost is increased.
　本発明は、上記に鑑みてなされたものであり、平滑コンデンサに使用しているフィルムコンデンサの劣化による発熱焼損破損を安価な構成で確実に回避できる保護回路を備えたインバータ装置を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to provide an inverter device including a protection circuit that can reliably avoid heat burnout damage due to deterioration of a film capacitor used in a smoothing capacitor with an inexpensive configuration. And
　上述した課題を解決し、目的を達成するために、本発明は、交流電源を直流電源に変換するコンバータ部と、突入電流抑制リレーと突入電流抑制抵抗器を並列接続した突入電流抑制回路であって一端が前記コンバータ部の正極出力端に接続される突入電流抑制回路と、前記突入電流抑制回路の他端が接続される正極母線と前記コンバータ部の負極出力端が接続される負極母線との間に接続される平滑コンデンサであるフィルムコンデンサとを備えるインバータ装置において、前記フィルムコンデンサの温度を検出するための温度検出手段と、前記温度検出手段が出力する検出温度と判定温度とを比較し、検出温度が判定温度よりも低い間は前記突入電流抑制リレーをオン制御し、検出温度が判定温度を超えると前記突入電流抑制リレーをオフ制御する制御手段とを備えることを特徴とする。 In order to solve the above-described problems and achieve the object, the present invention is a converter unit that converts an AC power source into a DC power source, and an inrush current suppression circuit in which an inrush current suppression relay and an inrush current suppression resistor are connected in parallel. An inrush current suppression circuit having one end connected to the positive output end of the converter unit, a positive bus connected to the other end of the inrush current suppression circuit, and a negative bus connected to the negative output end of the converter unit In an inverter device comprising a film capacitor that is a smoothing capacitor connected in between, a temperature detection means for detecting the temperature of the film capacitor, and a detection temperature and a determination temperature output by the temperature detection means are compared, While the detected temperature is lower than the judgment temperature, the inrush current suppression relay is turned on. When the detected temperature exceeds the judgment temperature, the inrush current suppression relay is turned off. And a controlling means for controlling.
　本発明によれば、コンバータ部の出力電流がフィルムコンデンサに流れ込む電流路を、突入電流抑制リレーを経由して形成している運転時において、フィルムコンデンサの劣化が進行して上昇した温度が判定温度よりも高くなると、電流路が突入電流抑制抵抗器を経由する経路に切り替わる。その結果、突入電流抑制抵抗器がジュール熱により断線し、コンバータ部の出力電流がフィルムコンデンサに流れ込むのが遮断され、フィルムコンデンサが劣化による発熱焼損破損から保護される。このように、温度検出手段を追加するだけで、従前の突入電流抑制回路を流用する安価な構成で、平滑コンデンサに使用しているフィルムコンデンサの劣化による発熱焼損破損を確実に回避できるという効果を奏する。 According to the present invention, during the operation in which the current path through which the output current of the converter unit flows into the film capacitor is formed via the inrush current suppression relay, the temperature that has increased due to the deterioration of the film capacitor is determined as the determination temperature. Becomes higher, the current path is switched to a path via the inrush current suppression resistor. As a result, the inrush current suppression resistor is disconnected by Joule heat, the output current of the converter unit is blocked from flowing into the film capacitor, and the film capacitor is protected from heat burnout damage due to deterioration. In this way, with the addition of a temperature detection means, an inexpensive configuration that diverts a conventional inrush current suppression circuit, and the effect of reliably avoiding heat burnout damage due to deterioration of the film capacitor used in the smoothing capacitor can be achieved. Play.
図１は、本発明の一実施例によるインバータ装置の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of an inverter device according to an embodiment of the present invention. 図２は、平滑コンデンサであるフィルムコンデンサとサーミスタの位置関係を説明する図である。FIG. 2 is a diagram for explaining the positional relationship between a film capacitor, which is a smoothing capacitor, and a thermistor. 図３は、突入電流抑制リレーオン時のコンバータ出力電流経路を説明する図である。FIG. 3 is a diagram illustrating the converter output current path when the inrush current suppression relay is on. 図４は、突入電流抑制リレーオフ時のコンバータ出力電流経路を説明する図である。FIG. 4 is a diagram illustrating the converter output current path when the inrush current suppression relay is off.
　以下に、本発明にかかるインバータ装置の実施例を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。 Hereinafter, embodiments of an inverter device according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
　図１は、本発明の一実施例によるインバータ装置の構成を示すブロック図である。図１において、この実施例によるインバータ装置１は、コンバータ部１１、突入電流抑制回路１２、フィルムコンデンサからなる平滑コンデンサ１３、主回路部１４、および制御部１５を備える一般的なインバータ装置において、サーミスタ１６を追加し、制御部１５に平滑コンデンサ（フィルムコンデンサ）１３を保護する機能を追加した構成である。以降、平滑コンデンサ１３は、フィルムコンデンサ１３と記す。 FIG. 1 is a block diagram showing a configuration of an inverter device according to an embodiment of the present invention. In FIG. 1, an inverter device 1 according to this embodiment includes a thermistor in a general inverter device including a converter unit 11, an inrush current suppression circuit 12, a smoothing capacitor 13 formed of a film capacitor, a main circuit unit 14, and a control unit 15. 16 is added, and the function of protecting the smoothing capacitor (film capacitor) 13 is added to the control unit 15. Hereinafter, the smoothing capacitor 13 is referred to as a film capacitor 13.
　まず、一般的なインバータ装置の接続関係等について説明する。
　コンバータ部１１は、ダイオードブリッジで構成され、三相交流電源２を直流電力に変換する。コンバータ部１１の正極出力端は突入電流抑制回路１２の一端に接続され、コンバータ部１１の負極出力端は主回路部１４の負極入力端に直接接続されている。 First, a connection relationship of a general inverter device will be described.
The converter unit 11 is configured by a diode bridge, and converts the three-phase AC power source 2 into DC power. The positive output terminal of the converter unit 11 is connected to one end of the inrush current suppression circuit 12, and the negative output terminal of the converter unit 11 is directly connected to the negative input terminal of the main circuit unit 14.
　突入電流抑制回路１２は、並列接続された突入電流抑制抵抗器１２ａおよび突入電流抑制リレー１２ｂで構成される。突入電流抑制リレー１２ｂは、制御部１５によりオン・オフ制御される。突入電流抑制回路１２の他端は主回路部１４の正極入力端に接続されている。 The inrush current suppression circuit 12 includes an inrush current suppression resistor 12a and an inrush current suppression relay 12b connected in parallel. The inrush current suppression relay 12 b is on / off controlled by the control unit 15. The other end of the inrush current suppression circuit 12 is connected to the positive input terminal of the main circuit unit 14.
　フィルムコンデンサ１３は、一端が突入電流抑制回路１２の他端と主回路部１４の正極入力端とを接続する正極母線に接続され、他端がコンバータ部１１の負極出力端と主回路部１４の負極入力端とを接続する負極母線に接続され、コンバータ部１１の出力電力を平滑する。 The film capacitor 13 has one end connected to the positive bus connecting the other end of the inrush current suppression circuit 12 and the positive input end of the main circuit unit 14, and the other end connected to the negative output end of the converter unit 11 and the main circuit unit 14. The output power of the converter unit 11 is smoothed by being connected to the negative electrode bus that connects the negative input terminal.
　主回路部１４は、フライホイールダイオードが逆並列接続されたスイッチング素子によるスイッチング回路を備え、制御部１５から供給されるＰＷＭ駆動信号により、フィルムコンデンサ１３の充電電圧（直流電源）をスイッチングして誘導電動機３を駆動する交流電力に変換する。 The main circuit unit 14 includes a switching circuit having a switching element in which flywheel diodes are connected in antiparallel, and switches the charging voltage (DC power supply) of the film capacitor 13 with a PWM drive signal supplied from the control unit 15 to induce the circuit. Conversion to AC power for driving the electric motor 3 is performed.
　以上の一般的な構成において、この実施例では、温度検出手段の一例であるサーミスタ１６をフィルムコンデンサ１３の近傍に配置し、サーミスタ１６が検出するフィルムコンデンサ１３の温度情報が制御部１５に入力される構成である。制御部１５は、この実施例では、サーミスタ１６の検出温度に基づいて突入電流抑制リレー１２ｂのオン・オフ制御を行う制御手段の機能が追加されている。すなわち、制御部１５は、上記した一般的な構成では突入電流の大きさなど別のパラメータに基づいて突入電流抑制リレー１２ｂのオン・オフ制御を行うようになっている。 In the above general configuration, in this embodiment, the thermistor 16 which is an example of the temperature detecting means is disposed in the vicinity of the film capacitor 13, and the temperature information of the film capacitor 13 detected by the thermistor 16 is input to the control unit 15. This is a configuration. In this embodiment, the control unit 15 is added with a function of control means for performing on / off control of the inrush current suppression relay 12b based on the temperature detected by the thermistor 16. That is, the control unit 15 performs on / off control of the inrush current suppression relay 12b based on another parameter such as the magnitude of the inrush current in the general configuration described above.
　図２は、平滑コンデンサであるフィルムコンデンサとサーミスタの位置関係を説明する図である。図２（１）に示すように、サーミスタ１６は、フィルムコンデンサ１３の近傍に配置される。具体的には、熱伝導性や振動対策のために、例えば図２（２）に示すように、サーミスタ１６は、ボンディング材１７によりフィルムコンデンサ１３に接着している。これによって、サーミスタ１６は、フィルムコンデンサ１３の外周表面温度を正確に検出できるようになる。 FIG. 2 is a diagram for explaining the positional relationship between a film capacitor, which is a smoothing capacitor, and a thermistor. As shown in FIG. 2 (1), the thermistor 16 is disposed in the vicinity of the film capacitor 13. Specifically, the thermistor 16 is bonded to the film capacitor 13 by a bonding material 17 as shown in FIG. As a result, the thermistor 16 can accurately detect the outer peripheral surface temperature of the film capacitor 13.
　次に、図１、図３、図４を参照して、この実施例によるフィルムコンデンサ１３の保護動作について説明する。なお、図３は、突入電流抑制リレーオン時のコンバータ出力電流経路を説明する図である。図４は、突入電流抑制リレーオフ時のコンバータ出力電流経路を説明する図である。 Next, the protective operation of the film capacitor 13 according to this embodiment will be described with reference to FIGS. FIG. 3 is a diagram illustrating the converter output current path when the inrush current suppression relay is on. FIG. 4 is a diagram illustrating the converter output current path when the inrush current suppression relay is off.
　インバータ装置１では、三相交流電源２の投入時では、制御部１５は、突入電流抑制リレー１２ｂをオフさせている。このときのコンバータ部１１の出力電流は、図４に示すように、コンバータ部１１の正極出力端→突入電流抑制抵抗器１２ａ→フィルムコンデンサ１３→コンバータ部１１の負極出力端に至る経路２１で流れる。これによって、三相交流電源２の投入時における投入電流が突入電流抑制抵抗器１２ａによって抑制される。 In the inverter device 1, when the three-phase AC power source 2 is turned on, the control unit 15 turns off the inrush current suppression relay 12b. At this time, the output current of the converter unit 11 flows through a path 21 extending from the positive output terminal of the converter unit 11 to the inrush current suppression resistor 12a → the film capacitor 13 → the negative output terminal of the converter unit 11, as shown in FIG. . Thereby, the input current when the three-phase AC power supply 2 is turned on is suppressed by the inrush current suppressing resistor 12a.
　制御部１５は、突入電流が所定値以下になると、直ちに突入電流抑制リレー１２ｂをオンさせる。そして、制御部１５は、誘導電動機３を駆動している運転中においてサーミスタ１６から逐一入力されるフィルムコンデンサ１３の温度情報と判定温度とを比較する。制御部１５は、サーミスタ１６からの検出温度が判定温度以下である間、突入電流抑制リレー１２ｂを継続してオンさせる。突入電流抑制リレー１２ｂがオンしている期間では、コンバータ部１１の出力電流は、図３に示すように、コンバータ部１１の正極出力端→突入電流抑制リレー１２ｂ→フィルムコンデンサ１３→コンバータ部１１の負極出力端に至る経路２０で流れる。 The controller 15 immediately turns on the inrush current suppression relay 12b when the inrush current becomes a predetermined value or less. And the control part 15 compares the temperature information of the film capacitor | condenser 13 input one by one from the thermistor 16 and the determination temperature during the driving | operation which drives the induction motor 3. FIG. The control unit 15 continues to turn on the inrush current suppression relay 12b while the detected temperature from the thermistor 16 is equal to or lower than the determination temperature. During the period when the inrush current suppression relay 12b is on, the output current of the converter unit 11 is, as shown in FIG. 3, the positive output terminal of the converter unit 11 → the inrush current suppression relay 12b → the film capacitor 13 → the converter unit 11 It flows through a path 20 that reaches the negative electrode output end.
　この場合は、フィルムコンデンサ１３が所望の平滑動作を行っている場合であるが、三相交流電源２の投入・遮断の回数や、インバータ装置１の運転時間の長さに応じてフィルムコンデンサ１３に問題となる劣化が進行し、内部抵抗が増加していく。その内部抵抗の増加に伴ってフィルムコンデンサ１３の温度が高くなっていくので、サーミスタ１６の検出温度が上昇する。 In this case, the film capacitor 13 is performing a desired smoothing operation. However, the film capacitor 13 is changed according to the number of times the three-phase AC power supply 2 is turned on and off and the length of the operation time of the inverter device 1. Deterioration that becomes a problem progresses and internal resistance increases. As the internal resistance increases, the temperature of the film capacitor 13 increases, so that the detection temperature of the thermistor 16 increases.
　制御部１５は、サーミスタ１６からの検出温度が判定温度を超えると、突入電流抑制リレー１２ｂを直ちにオフさせる。これによって、コンバータ部１１の出力電流は、図４に示すように、コンバータ部１１の正極出力端→突入電流抑制抵抗器１２ａ→フィルムコンデンサ１３→コンバータ部１１の負極出力端に至る経路２１で流れる。 When the detected temperature from the thermistor 16 exceeds the determination temperature, the control unit 15 immediately turns off the inrush current suppression relay 12b. As a result, the output current of the converter unit 11 flows through a path 21 extending from the positive output terminal of the converter unit 11 to the inrush current suppression resistor 12a → the film capacitor 13 → the negative output terminal of the converter unit 11, as shown in FIG. .
　この場合、制御部１５は、継続して突入電流抑制リレー１２ｂをオフさせるので、コンバータ部１１の出力電流が突入電流抑制抵抗器１２ａを流れ続ける。その結果、突入電流抑制抵抗器１２ａがジュール熱により溶断（過負荷断線）し、コンバータ部１１の出力電流がフィルムコンデンサ１３に流れ込むのが遮断される。このように、フィルムコンデンサ１３は、経年劣化などで内部抵抗が増大することによる過熱焼損破損から確実に保護される。主回路１４は、コンバータ部１１から切り離れ、誘導電動機３への出力動作を停止する。 In this case, since the control unit 15 continues to turn off the inrush current suppression relay 12b, the output current of the converter unit 11 continues to flow through the inrush current suppression resistor 12a. As a result, the inrush current suppression resistor 12a is melted (overloaded disconnection) by Joule heat, and the output current of the converter unit 11 is blocked from flowing into the film capacitor 13. In this way, the film capacitor 13 is reliably protected from overheating damage due to an increase in internal resistance due to deterioration over time. The main circuit 14 is disconnected from the converter unit 11 and stops the output operation to the induction motor 3.
　以上のように、この実施例によれば、平滑コンデンサに使用しているフィルムコンデンサの劣化による発熱焼損破損を回避できる保護回路を、フィルムコンデンサの温度を検出するサーミスタを追加するだけで、インバータ装置に元から設置されている制御部および突入電流抑制回路を流用するという安価な構成で容易に実現できる。 As described above, according to this embodiment, an inverter device can be obtained by simply adding a thermistor for detecting the temperature of the film capacitor to the protection circuit capable of avoiding heat burnout damage due to deterioration of the film capacitor used in the smoothing capacitor. The control unit and the inrush current suppression circuit that are installed from the beginning can be easily realized with an inexpensive configuration.
　なお、平滑コンデンサに電界コンデンサを使用する場合、突入電流抑制抵抗器に過負荷断線させやすい小さい抵抗値のものを使用すると、容量値の大きい電界コンデンサに過大な突入電流が流れ込み、電界コンデンサを焼損させる恐れがある。 When an electric field capacitor is used for the smoothing capacitor, if an inrush current suppression resistor with a small resistance value that is easy to overload is used, an excessive inrush current will flow into the electric capacitor with a large capacitance value, causing the electric field capacitor to burn out. There is a fear.
　この点、この実施例では、電界コンデンサよりも容量値の小さいフィルムコンデンサを使用するので、三相交流電源の投入時にフィルムコンデンサに流れ込む突入電流が小さくなる。したがって、突入電流抑制抵抗器は過負荷断線させやすい小さい抵抗値のものに選定することができる。 In this respect, in this embodiment, since a film capacitor having a capacitance value smaller than that of the electric field capacitor is used, the inrush current flowing into the film capacitor when the three-phase AC power supply is turned on becomes small. Therefore, the inrush current suppression resistor can be selected to have a small resistance value that is easy to cause overload disconnection.
　以上のように、本発明にかかるインバータ装置は、平滑コンデンサに使用するフィルムコンデンサの劣化による発熱焼損破損を安価な構成で確実に回避できるインバータ装置として有用である。 As described above, the inverter device according to the present invention is useful as an inverter device that can reliably avoid heat burnout damage due to deterioration of a film capacitor used for a smoothing capacitor with an inexpensive configuration.
　１　インバータ装置
　２　三相交流電源
　３　誘導電動機
　１１　コンバータ部
　１２　突入電流抑制回路
　１２ａ　突入電流抑制抵抗器
　１２ｂ　突入電流抑制リレー
　１３　フィルムコンデンサ（平滑コンデンサ）
　１４　主回路部
　１５　制御部（制御手段）
　１６　サーミスタ（温度検出手段） DESCRIPTION OF SYMBOLS 1 Inverter apparatus 2 Three-phase alternating current power supply 3 Induction motor 11 Converter part 12 Inrush current suppression circuit 12a Inrush current suppression resistor 12b Inrush current suppression relay 13 Film capacitor (smoothing capacitor)
14 Main circuit section 15 Control section (control means)
16 thermistor (temperature detection means)

Claims (1)

  1. 　交流電源を直流電源に変換するコンバータ部と、突入電流抑制リレーと突入電流抑制抵抗器を並列接続した突入電流抑制回路であって一端が前記コンバータ部の正極出力端に接続される突入電流抑制回路と、前記突入電流抑制回路の他端が接続される正極母線と前記コンバータ部の負極出力端が接続される負極母線との間に接続される平滑コンデンサであるフィルムコンデンサとを備えるインバータ装置において、
    　前記フィルムコンデンサの温度を検出するための温度検出手段と、
    　前記温度検出手段が出力する検出温度と判定温度とを比較し、検出温度が判定温度よりも低い間は前記突入電流抑制リレーをオン制御し、検出温度が判定温度を超えると前記突入電流抑制リレーをオフ制御する制御手段と
    　を備えることを特徴とするインバータ装置。     A converter unit that converts an AC power source into a DC power source, and an inrush current suppression circuit in which an inrush current suppression relay and an inrush current suppression resistor are connected in parallel, one end of which is connected to the positive output terminal of the converter unit And an inverter device comprising a film capacitor that is a smoothing capacitor connected between a positive electrode bus connected to the other end of the inrush current suppression circuit and a negative electrode bus connected to the negative output terminal of the converter unit,
    Temperature detecting means for detecting the temperature of the film capacitor;
    The detection temperature output from the temperature detection means is compared with the determination temperature, and the inrush current suppression relay is on-controlled while the detection temperature is lower than the determination temperature, and when the detection temperature exceeds the determination temperature, the inrush current suppression relay An inverter device comprising: control means for controlling off of the inverter device.
PCT/JP2010/059391 2010-06-02 2010-06-02 Inverter apparatus WO2011151906A1 (en)

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JP2008061476A (en) * 2006-09-04 2008-03-13 Nissan Motor Co Ltd Power conversion device
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Publication number Priority date Publication date Assignee Title
CN102789307A (en) * 2012-06-29 2012-11-21 浪潮电子信息产业股份有限公司 Energy-saving design method and device for restraining instant impact current of high-power fan
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