JP2007132684A - Insulation resistance measurement device - Google Patents

Insulation resistance measurement device Download PDF

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JP2007132684A
JP2007132684A JP2005323253A JP2005323253A JP2007132684A JP 2007132684 A JP2007132684 A JP 2007132684A JP 2005323253 A JP2005323253 A JP 2005323253A JP 2005323253 A JP2005323253 A JP 2005323253A JP 2007132684 A JP2007132684 A JP 2007132684A
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insulation resistance
high voltage
voltage system
electrode
line
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Shinji Kato
進二 加藤
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Nidec Elesys Corp
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Honda Elesys Co Ltd
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  • Measurement Of Resistance Or Impedance (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide the insulation resistance measurement device capable of measuring a high voltage system without connecting an electric component to the high electric voltage line in an activated state. <P>SOLUTION: The AC current outputted by the oscillator 11 is outputted to the electrode 12 through the current limiting resistor Rc is transmitted to the high voltage line 23 from the electrode 12. The current at the other terminal of the current limiting resistance Rc is acquired by the A/D terminal of the CPU 15 through the buffer amp 13 and the integrator 14, and the acquired voltage value is read by the A/D converter in the CPU 15. From the acquired voltage value, the CPU 15 operates for calculating the insulation resistance Rd. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電気自動車やハイブリッド自動車などで、モータ等を駆動するための高電圧系システムの絶縁抵抗測定装置に関する。  The present invention relates to an insulation resistance measuring device for a high voltage system for driving a motor or the like in an electric vehicle or a hybrid vehicle.

従来、高電圧系システムの線路と、通常電圧系システム側の測定回路とを容量素子で接続し、通常電圧系システム側の測定回路から容量素子を通して、高電圧系システムへ交流電流が流れる状態にして、高電圧系システムの絶縁抵抗を測定する装置が知られている（例えば、特許文献１、２参照）。
特開２００１−３３０６４３号公報 特開２００２−０２０９３１号公報 Conventionally, the line of the high voltage system and the measurement circuit on the normal voltage system side are connected by a capacitive element so that an alternating current flows from the measurement circuit on the normal voltage system side through the capacitive element to the high voltage system. Devices that measure the insulation resistance of a high-voltage system are known (see, for example, Patent Documents 1 and 2).
JP 2001-330643 A JP 2002-020931 A

しかしながら、従来の技術においては、絶縁抵抗を測定するためには、通常電圧系システム側の測定回路と高電圧系システムの線路とを容量素子で直接接続する必要があるため、容量素子の接続により高電圧系システムの絶縁性が悪くなる可能性が高く、測定方法として最適ではないという問題があった。  However, in the conventional technology, in order to measure the insulation resistance, it is necessary to directly connect the measurement circuit on the normal voltage system side and the line of the high voltage system system with the capacitance element. There is a high possibility that the insulation performance of the high-voltage system is deteriorated, and there is a problem that it is not optimal as a measurement method.

本発明はかかる課題を解決するためになされたもので、絶縁抵抗を測定したい高電圧系システムの線路に直接部品を接続することなく、高電圧系システムの線路の絶縁抵抗を測定する事ができる絶縁抵抗測定装置を提供することを目的とする。  The present invention has been made to solve such a problem, and it is possible to measure the insulation resistance of a high-voltage system line without directly connecting a component to the line of the high-voltage system where it is desired to measure the insulation resistance. An object of the present invention is to provide an insulation resistance measuring device.

本発明は上記の課題を解決するためになされたもので、請求項１に記載の発明は、通常電圧系システムとモータ駆動用の高電圧系システムとから構成される車載用システムの前記高電圧系システムの絶縁抵抗を測定する絶縁抵抗測定装置において、交流電流を出力する電流出力手段と、一端を前記電流出力手段の出力端に接続された抵抗と、前記抵抗の他端に接続され、前記高電圧系システムの線路の近傍に配置された第１の電極と、前記抵抗の他端における電圧を検出する電圧検出手段と、前記電圧検出手段での検出電圧から、前記高電圧系システムの線路とＧＮＤとの間に形成される前記絶縁抵抗を算出する演算をする演算手段と、を具備する事を特徴とする絶縁抵抗測定装置である。  The present invention has been made to solve the above-described problems, and the invention according to claim 1 is directed to the high voltage of the in-vehicle system including a normal voltage system and a high voltage system for driving a motor. In an insulation resistance measuring device for measuring an insulation resistance of a system system, a current output means for outputting an alternating current, a resistor having one end connected to the output end of the current output means, and the other end of the resistor, From the first electrode arranged in the vicinity of the line of the high voltage system, the voltage detection means for detecting the voltage at the other end of the resistor, and the voltage detected by the voltage detection means, the line of the high voltage system And an arithmetic means for calculating the insulation resistance formed between the first and the second GND, and an insulation resistance measuring device.

また、請求項２に記載の発明は、ＧＮＤ接地され、前記高電圧系システムの線路の近傍に配置された第２の電極を具備する事を特徴とする請求項１に記載の絶縁抵抗測定装置である。  The invention according to claim 2 further comprises a second electrode which is GND-grounded and is disposed in the vicinity of the line of the high-voltage system. It is.

請求項１の発明によれば、高電圧系システムの線路に電気部品を直接接続することなく、高電圧系システムの絶縁抵抗を測定することができる。  According to the first aspect of the present invention, it is possible to measure the insulation resistance of the high voltage system without directly connecting an electrical component to the line of the high voltage system.

請求項２の発明によれば、ＧＮＤ接地された第２の電極と高電圧系システムの線路とを近傍に配置し、その間にＣＲ成分を形成することで、測定値に対する高電圧系システムの線路と通常電圧系システムとの間の容量値の変動の影響を少なくでき、高電圧系システムの線路と通常電圧系システムとの間の容量成分を安定させる事が出来るので、より正確な絶縁抵抗測定を行うことができる。  According to the second aspect of the present invention, the second electrode grounded to GND and the line of the high voltage system are arranged in the vicinity, and a CR component is formed between them, so that the line of the high voltage system for the measured value is obtained. More accurate insulation resistance measurement because it can reduce the influence of the fluctuation of the capacitance value between the high voltage system and the normal voltage system, and can stabilize the capacitance component between the line of the high voltage system and the normal voltage system. It can be performed.

以下、図面を参照して本発明の第１の実施形態について説明する。図１は本実施形態による絶縁抵抗測定装置の全体構成を示すブロック図である。図１は、通常電圧系システム１０と高電圧系システム２０とから構成され、通常電圧系システム１０は、交流信号を出力する発振器（電流出力手段に対応）１１と、発振器１１に一端が接続された電流制限抵抗（抵抗に対応）Ｒｃと、電流制限抵抗Ｒｃの他端に接続され、高電圧線路２３の近傍に配置された電極（第１の電極に対応）１２と、電流制限抵抗Ｒｃの他端に接続されたバッファアンプ１３と、バッファアンプ１３の出力端に接続された積分器１４と、Ａ／Ｄ端子から積分器１４の出力電圧を取り込み、絶縁抵抗Ｒｄを算出する演算を行うＣＰＵ（中央処理装置：演算手段に対応）１５とから構成されている。  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the insulation resistance measuring apparatus according to the present embodiment. FIG. 1 includes a normal voltage system 10 and a high voltage system 20. The normal voltage system 10 includes an oscillator (corresponding to current output means) 11 that outputs an AC signal, and one end connected to the oscillator 11. A current limiting resistor (corresponding to the resistor) Rc, an electrode (corresponding to the first electrode) 12 connected to the other end of the current limiting resistor Rc and disposed near the high voltage line 23, and a current limiting resistor Rc A buffer amplifier 13 connected to the other end, an integrator 14 connected to the output terminal of the buffer amplifier 13, and a CPU that takes in the output voltage of the integrator 14 from the A / D terminal and calculates the insulation resistance Rd (Central processing unit: corresponding to calculation means) 15.

１２Ｖ電源を使用した通常電圧系システム１０は、車体や大地のＧＮＤと同電位になっている。また高電圧系システム２０には、高電圧電源２１と、高電圧電源２１により駆動されるモータ２２と、高電圧電源２１の電力をモータ２２に供給するための高電圧線路２３とが設けられている。ここで、電極１２は高電圧線路２３のハーネス被覆部の上から円筒状に巻きつけた形で設置されている。なお、高電圧線路２３の周りに設置する電極１２は、絶縁抵抗測定をする際に作業者が手動で設置・取り外しできるようにしても良い。  The normal voltage system 10 using a 12V power supply has the same potential as the GND of the vehicle body or the ground. The high voltage system 20 is provided with a high voltage power source 21, a motor 22 driven by the high voltage power source 21, and a high voltage line 23 for supplying the power of the high voltage power source 21 to the motor 22. Yes. Here, the electrode 12 is installed in the form of being wound in a cylindrical shape from above the harness covering portion of the high voltage line 23. The electrode 12 installed around the high voltage line 23 may be manually installed / removed by an operator when measuring insulation resistance.

図２は図１の等価回路図である。この図に示すように、電極１２と高電圧線路２３との間には、抵抗成分Ｒ１２と容量成分Ｃ１２とが形成され、また、高電圧線路２３と通常電圧系システム１０のＧＮＤとの間には絶縁抵抗Ｒｄが形成されている。  FIG. 2 is an equivalent circuit diagram of FIG. As shown in this figure, a resistance component R12 and a capacitance component C12 are formed between the electrode 12 and the high voltage line 23, and between the high voltage line 23 and the GND of the normal voltage system 10. Is formed with an insulation resistance Rd.

図３は図２の絶縁抵抗測定経路を示す図である。発振器１１は電流制限抵抗Ｒｃの一端に接続され、電流制限抵抗Ｒｃの他端が、抵抗成分Ｒ１２と容量成分Ｃ１２との並列接続の一端に接続されている。並列接続の他端は、絶縁抵抗Ｒｄの一端に接続されていて、絶縁抵抗Ｒｄの他端はＧＮＤ接地されている。また、電流制限抵抗Ｒｃの他端にはバッファアンプ１３が接続されている。  FIG. 3 is a diagram showing the insulation resistance measurement path of FIG. The oscillator 11 is connected to one end of the current limiting resistor Rc, and the other end of the current limiting resistor Rc is connected to one end of the parallel connection of the resistance component R12 and the capacitance component C12. The other end of the parallel connection is connected to one end of the insulation resistance Rd, and the other end of the insulation resistance Rd is grounded to GND. A buffer amplifier 13 is connected to the other end of the current limiting resistor Rc.

発振器１１から、電流制限抵抗Ｒｃを介して交流電流を流し、電流制限抵抗Ｒｃの他端の信号を測定した時、容量成分Ｃ１２、抵抗成分Ｒ１２が一定で値が既知であれば、絶縁抵抗Ｒｄが変化した時に測定した信号も同時に変化するので、電流制限抵抗Ｒｃの他端での信号をＣＰＵ１５で測定する事により絶縁抵抗Ｒｄの値を求めることができる。  When an alternating current is passed from the oscillator 11 via the current limiting resistor Rc and the signal at the other end of the current limiting resistor Rc is measured, if the capacitance component C12 and the resistance component R12 are constant and the values are known, the insulation resistance Rd Since the signal measured when the current value changes also changes at the same time, the value of the insulation resistance Rd can be obtained by measuring the signal at the other end of the current limiting resistor Rc by the CPU 15.

次に図１に記載の第１の実施形態の動作について説明する。まず、容量成分Ｃ１２及び抵抗成分Ｒ１２の値は、電極１２と高電圧線路２３とが対向している部分の構造や高電圧線路２３のハーネス被覆部の材料の比誘電率等から予め求めておき、ＣＰＵ１５に接続されたメモリ（図示略）に値を保存する。発振器１１から出力された交流電流は、電流制限抵抗Ｒｃを介して、電極１２に出力され、さらに電極１２から高電圧線路２３、絶縁抵抗を介して、ＧＮＤへ流れる。電流制限抵抗Ｒｃの他端における電圧をバッファアンプ１３と、積分器１４とを介し、ＣＰＵ１５のＡ／Ｄ端子から取り込み、ＣＰＵ１５内のＡ／Ｄ変換器（図示略：電圧検出手段に対応）で取り込んだ電圧値を読み込み、メモリに保存する。保存された電圧値と、予めメモリ内に記憶させておいた抵抗成分Ｒ１２及び容量成分Ｃ１２の値とからＣＰＵ１５で演算することにより絶縁抵抗Ｒｄの算出を行う。高電圧系システム２０の稼動時には、絶縁抵抗Ｒｄの測定を定期的に行う。  Next, the operation of the first embodiment shown in FIG. 1 will be described. First, the values of the capacitance component C12 and the resistance component R12 are obtained in advance from the structure of the portion where the electrode 12 and the high voltage line 23 face each other, the relative dielectric constant of the material of the harness covering portion of the high voltage line 23, and the like. The value is stored in a memory (not shown) connected to the CPU 15. The alternating current output from the oscillator 11 is output to the electrode 12 via the current limiting resistor Rc, and further flows from the electrode 12 to GND via the high voltage line 23 and the insulation resistance. The voltage at the other end of the current limiting resistor Rc is taken in from the A / D terminal of the CPU 15 via the buffer amplifier 13 and the integrator 14, and is A / D converter (not shown: corresponding to voltage detection means) in the CPU 15. Read the acquired voltage value and save it in memory. The insulation resistance Rd is calculated by calculating with the CPU 15 from the stored voltage value and the values of the resistance component R12 and the capacitance component C12 stored in advance in the memory. When the high voltage system 20 is in operation, the insulation resistance Rd is periodically measured.

以上のことにより、高電圧系システム２０と、通常電圧系システム１０との間の絶縁抵抗Ｒｄが低下した時に、作業者が高電圧系システム２０の回路に触れると、図４に示すような経路を通して感電する事となり危険であるが、絶縁抵抗Ｒｄの値を定期的に測定することにより、絶縁抵抗Ｒｄが低下した時にはアラームを鳴らし、作業者に対して注意を促す事ができる。  As a result, when the operator touches the circuit of the high voltage system 20 when the insulation resistance Rd between the high voltage system 20 and the normal voltage system 10 decreases, a route as shown in FIG. However, by periodically measuring the value of the insulation resistance Rd, when the insulation resistance Rd decreases, an alarm can be sounded to alert the operator.

以下、図面を参照して本発明の第２の実施形態について説明する。図５は本実施形態による絶縁抵抗測定装置の全体構成を示すブロック図である。図５に示す装置は、図１に示す第１の実施形態の絶縁抵抗測定装置に、ＧＮＤ接地され高電圧線路２３の近傍に配置された電極（第２の電極に対応）１６を加えたものである。ここで、電極１６は電極１２と同様に高電圧線路２３のハーネス被覆部の上に円筒状に巻きつけた形で設置されている。電極１６と高電圧線路２３との間には、図６に示すように抵抗成分Ｒ１６と容量成分Ｃ１６とが形成されている。また、高電圧線路２３と通常電圧系システム１０のＧＮＤとの間には、絶縁抵抗Ｒｄが形成されている。  Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram showing the overall configuration of the insulation resistance measuring apparatus according to the present embodiment. The apparatus shown in FIG. 5 is obtained by adding an electrode (corresponding to a second electrode) 16 grounded to GND and arranged in the vicinity of the high voltage line 23 to the insulation resistance measuring apparatus of the first embodiment shown in FIG. It is. Here, like the electrode 12, the electrode 16 is installed in the form of being wound in a cylindrical shape on the harness covering portion of the high voltage line 23. A resistance component R16 and a capacitance component C16 are formed between the electrode 16 and the high voltage line 23 as shown in FIG. Further, an insulation resistance Rd is formed between the high voltage line 23 and the GND of the normal voltage system 10.

次に、第２の実施形態の動作について説明する。まず、容量成分Ｃ１２、Ｃ１６及び抵抗成分Ｒ１２、Ｒ１６の値を予め求めておき、メモリに記憶させる。発振器１１から出力された交流電流は、電流制限抵抗Ｒｃを介して電極１２に出力され、さらに電極１２から高電圧線路２３へ伝達される。また、高電圧線路２３へ伝達された電流は、高電圧線路２３から電極１６に伝達される。  Next, the operation of the second embodiment will be described. First, values of capacitance components C12 and C16 and resistance components R12 and R16 are obtained in advance and stored in a memory. The alternating current output from the oscillator 11 is output to the electrode 12 through the current limiting resistor Rc, and further transmitted from the electrode 12 to the high voltage line 23. Further, the current transmitted to the high voltage line 23 is transmitted from the high voltage line 23 to the electrode 16.

電流制限抵抗Ｒｃの他端における信号をバッファアンプ１３と、積分器１４とを介し、ＣＰＵ１５のＡ／Ｄ端子から取り込み、ＣＰＵ１５内のＡ／Ｄ変換器で取り込んだ電圧値を読み込み、メモリに保存する。保存された電圧値と、予めメモリ内に記憶させておいた抵抗成分Ｒ１２、Ｒ１６及び容量成分Ｃ１２、Ｃ１６の値とからＣＰＵ１５で演算することにより絶縁抵抗Ｒｄの算出を行う。また、第１の実施形態の時と同様に、高電圧系システム２０の稼動時には絶縁抵抗Ｒｄの測定を定期的に行う。  The signal at the other end of the current limiting resistor Rc is fetched from the A / D terminal of the CPU 15 via the buffer amplifier 13 and the integrator 14, and the voltage value fetched by the A / D converter in the CPU 15 is read and stored in the memory. To do. The CPU 15 calculates the insulation resistance Rd from the stored voltage value and the values of the resistance components R12 and R16 and the capacitance components C12 and C16 previously stored in the memory. Further, as in the case of the first embodiment, the insulation resistance Rd is periodically measured when the high voltage system 20 is in operation.

以上のように、電極１６を付加した構成にすることで、高電圧線路と通常電圧系システムとの間に形成されるＣＲ成分を安定させる事が出来るので、より正確な絶縁抵抗の測定を行うことできる。  As described above, since the CR component formed between the high voltage line and the normal voltage system can be stabilized by adding the electrode 16, the insulation resistance can be measured more accurately. I can.

本発明は、電気自動車やハイブリッド自動車などで、モータ等を駆動するための高電圧系システムの絶縁抵抗測定装置に用いて好適である。  The present invention is suitable for use in an insulation resistance measuring device of a high voltage system for driving a motor or the like in an electric vehicle or a hybrid vehicle.

本発明の第１の実施形態にかかる絶縁抵抗測定装置の構成を示すブロック図である。It is a block diagram which shows the structure of the insulation resistance measuring apparatus concerning the 1st Embodiment of this invention. 本発明の第１の実施形態にかかる絶縁抵抗測定装置の等価回路を示す図である。It is a figure which shows the equivalent circuit of the insulation resistance measuring apparatus concerning the 1st Embodiment of this invention. 本発明の第１の実施形態にかかる絶縁抵抗測定経路を示す図である。It is a figure which shows the insulation resistance measurement path | route concerning the 1st Embodiment of this invention. 絶縁抵抗が低下したときの高電圧系システムの感電経路を示す図である。It is a figure which shows the electric shock path | route of a high voltage system when insulation resistance falls. 本発明の第２の実施形態にかかる絶縁抵抗測定装置の構成を示すブロック図である。It is a block diagram which shows the structure of the insulation resistance measuring apparatus concerning the 2nd Embodiment of this invention. 本発明の第２の実施形態にかかる絶縁抵抗測定装置の等価回路を示す図である。It is a figure which shows the equivalent circuit of the insulation resistance measuring apparatus concerning the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１１ … 発振器（電流出力手段）
Ｒｃ … 電流制限抵抗（抵抗）
１２、１６ … 電極（第１の電極、第２の電極）
１５ … ＣＰＵ（演算手段）
Ｒｄ … 絶縁抵抗（絶縁抵抗）
Ｒ１２、Ｒ１６ … 抵抗成分
Ｃ１２、Ｃ１６ … 容量成分 11: Oscillator (current output means)
Rc: Current limiting resistor (resistance)
12, 16 ... Electrode (first electrode, second electrode)
15 ... CPU (calculation means)
Rd: Insulation resistance (insulation resistance)
R12, R16: Resistance component C12, C16: Capacitance component

Claims (2)

通常電圧系システムとモータ駆動用の高電圧系システムとから構成される車載用システムの前記高電圧系システムの絶縁抵抗を測定する絶縁抵抗測定装置において、
交流電流を出力する電流出力手段と、
一端を前記電流出力手段の出力端に接続された抵抗と、
前記抵抗の他端に接続され、前記高電圧系システムの線路の近傍に配置された第１の電極と、
前記抵抗の他端における電圧を検出する電圧検出手段と、
前記電圧検出手段での検出電圧から、前記高電圧系システムの線路とＧＮＤとの間に形成される前記絶縁抵抗を算出する演算をする演算手段と、
を具備する事を特徴とする絶縁抵抗測定装置。 In an insulation resistance measuring device for measuring the insulation resistance of the high voltage system of the in-vehicle system composed of a normal voltage system and a high voltage system for driving the motor,
Current output means for outputting an alternating current;
A resistor having one end connected to the output end of the current output means;
A first electrode connected to the other end of the resistor and disposed in the vicinity of the line of the high-voltage system;
Voltage detecting means for detecting a voltage at the other end of the resistor;
Calculation means for calculating the insulation resistance formed between the line of the high voltage system and GND from the detection voltage at the voltage detection means;
An insulation resistance measuring device comprising: ＧＮＤ接地され、前記高電圧系システムの線路の近傍に配置された第２の電極を具備する事を特徴とする請求項１に記載の絶縁抵抗測定装置。  The insulation resistance measuring apparatus according to claim 1, further comprising a second electrode that is GND-grounded and disposed near a line of the high-voltage system.
JP2005323253A 2005-11-08 2005-11-08 Insulation resistance measurement device Pending JP2007132684A (en)

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CN102759664A (en) * 2012-03-09 2012-10-31 田京涛 Detection device for insulation resistance of electrical equipment
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JP2018185241A (en) * 2017-04-27 2018-11-22 三菱電機株式会社 Insulation deterioration diagnosis system
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CN102841284A (en) * 2011-06-22 2012-12-26 同济大学 On-line insulated monitoring method for high voltage of electromobile
CN102759664A (en) * 2012-03-09 2012-10-31 田京涛 Detection device for insulation resistance of electrical equipment
CN104360160A (en) * 2014-11-14 2015-02-18 国家电网公司 High-voltage loop contact resistor live line measurement device
CN105196877A (en) * 2015-09-30 2015-12-30 上海交通大学 Health state diagnosis early-warning circuit and method of electric automobile high-voltage system
CN105277787A (en) * 2015-09-30 2016-01-27 上海凌翼动力科技有限公司 Method and system for predicting insulation resistor fault of electric car
CN105196877B (en) * 2015-09-30 2017-09-08 上海交通大学 Electric automobile high-voltage electric system health status diagnoses early warning circuit and method
JP2018185241A (en) * 2017-04-27 2018-11-22 三菱電機株式会社 Insulation deterioration diagnosis system
JP6991649B2 (en) 2017-04-27 2022-01-12 三菱電機株式会社 Insulation deterioration diagnostic sensor
CN109470923A (en) * 2018-11-19 2019-03-15 中国船舶重工集团公司第七O三研究所无锡分部 A method of it calculates and eliminates high-voltage insulating resistance measurement sample circuit error
CN110187180A (en) * 2019-06-17 2019-08-30 杭州神驹科技有限公司 A kind of detection method of vehicle resistance value
CN110187180B (en) * 2019-06-17 2022-01-07 杭州神驹科技有限公司 Method for detecting vehicle resistance value
JP2021032645A (en) * 2019-08-21 2021-03-01 新電元工業株式会社 Electric power supply device and control method for electric power supply device
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