JP2010124578A - Disconnection detection circuit of ground wire of vehicle charging system - Google Patents

Disconnection detection circuit of ground wire of vehicle charging system Download PDF

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JP2010124578A
JP2010124578A JP2008295121A JP2008295121A JP2010124578A JP 2010124578 A JP2010124578 A JP 2010124578A JP 2008295121 A JP2008295121 A JP 2008295121A JP 2008295121 A JP2008295121 A JP 2008295121A JP 2010124578 A JP2010124578 A JP 2010124578A
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detection circuit
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ground wire
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power supply
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JP5273787B2 (en
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Hiroyuki Okada
博之 岡田
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Nitto Kogyo Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive disconnection detection circuit for easily detecting disconnection of a ground wire of a vehicle charging cable without using a communication wire. <P>SOLUTION: The disconnection detection circuit of the ground wire 13 of the vehicle charging cable includes a first power supply wire 11, a second power supply wire 12 and the ground wire 13. The circuit includes a first detection circuit 16 detecting inter-wire voltage between the ground wire 13 and the first power supply wire 11 and a second detection circuit 17 detecting inter-wire voltage between the ground wire 13 and the second power supply wire 12. The detection circuits are provided with equal voltage dividing resistors 19 to 23. Diodes 18 and 21 are arranged between the voltage dividing resistors and the power supply wires. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電気自動車（ＥＶ）への充電時に使用される自動車用充電システムのアース線が断線していないか否かを簡便に検出できるアース線の断線検出回路に関するものである。   The present invention relates to an earth wire disconnection detection circuit that can easily detect whether or not an earth wire of an automobile charging system used for charging an electric vehicle (EV) is disconnected.

電気自動車（ＥＶ）への充電は、分電盤と自動車側の受電コネクタとの間を自動車用充電ケーブル（特許文献１）により接続して行われる。この充電ケーブル、充電ケーブルが接続されている充電ボックス及び電気自動車は人が触れるものであるため、人体を保護するために人が触れる部分のアースを確保する必要がある。このため充電ケーブルにはアース線が組み込まれ分電盤のアース端子を介して地面に接地されている。また充電ケーブルにはアース線のほかに、第１の電源線と第２の電源線とが組み込まれている。さらにこのほか、通信線が組み込まれている。   Charging the electric vehicle (EV) is performed by connecting the distribution board and the power receiving connector on the vehicle side with a vehicle charging cable (Patent Document 1). Since the charging cable, the charging box to which the charging cable is connected, and the electric vehicle are touched by a person, it is necessary to secure the ground of the part touched by the person in order to protect the human body. For this reason, a ground wire is incorporated in the charging cable and is grounded to the ground via the ground terminal of the distribution board. The charging cable includes a first power line and a second power line in addition to the ground line. In addition, a communication line is incorporated.

充電ケーブルを自動車側の受電コネクタに接続するとアース線は車のボディと導通する構造となっており、またアース線の他端は分電盤のアース端子を介して接地されている。このため人が車に触れた状態で万一漏電が起こっても、人体はアース線によって保護されることとなる。   When the charging cable is connected to the power receiving connector on the vehicle side, the ground wire is connected to the vehicle body, and the other end of the ground wire is grounded via the ground terminal of the distribution board. For this reason, even if a leakage occurs in the state where a person touches the car, the human body is protected by the ground wire.

また、充電ケーブルの途中（自動車の受電コネクタに近い部分）には漏電検出部を内蔵した保護装置（ＣＣＩＤ）が設置されており、その内部には給電リレーが収納されている。充電時には自動車側から通信線とアース線に信号を流し、給電リレーを動作させて充電の開始や終了を制御している。この制御を確実に行うために、自動車から保護装置の間は充電中に絶えず通信をしており通信が正常に行われない場合には、アース線の断線が1つの要因として考えられるため異常を検出することが可能である。しかし充電ケーブルのうち保護装置と分電盤との間の区間には通信線が設けられていない。このためこの区間については、自動車からアース線の断線を検出することができず、もしその区間でアース線が断線した場合には感電事故につながる危険性がある。   A protective device (CCID) with a built-in leakage detector is installed in the middle of the charging cable (portion close to the power receiving connector of the automobile), and a power supply relay is housed in the protective device (CCID). At the time of charging, a signal is sent from the automobile side to the communication line and the ground line, and the feeding relay is operated to control the start and end of charging. In order to perform this control reliably, if the vehicle and the protective device are constantly communicating during charging and communication is not performed normally, the disconnection of the ground wire is considered as one factor, and an abnormality is detected. It is possible to detect. However, no communication line is provided in a section of the charging cable between the protection device and the distribution board. For this reason, in this section, the disconnection of the ground wire cannot be detected from the automobile, and if the ground wire is disconnected in the section, there is a risk of causing an electric shock accident.

なお、アース線の断線を検出する方法としては、アース線にパルス信号を一定間隔で発信することによって断線の有無を確認する方法（特許文献１）も考えられる。しかしこの方法は接地環境に依存するため、接地抵抗を測定して調整を行う必要があり、専門家による作業が必要であるうえに複雑で高コストの検出機器が必要となるという問題がある。
特開平８−２９３３７４号公報 In addition, as a method for detecting the disconnection of the ground wire, a method (Patent Document 1) for confirming the presence or absence of the disconnection by transmitting a pulse signal to the ground wire at regular intervals is also conceivable. However, since this method depends on the grounding environment, it is necessary to measure and adjust the grounding resistance, which requires work by an expert and requires a complicated and expensive detection device.
JP-A-8-293374

従って本発明の目的は、自動車用充電システムに組み込まれているアース線の断線を、通信線を用いることなく簡便に検出できる低コストの断線検出回路を提供することである。また本発明の他の目的は、１００Ｖ充電時にも２００Ｖ充電時にも共用できるアース線の断線検出回路を提供することである。   Accordingly, an object of the present invention is to provide a low-cost disconnection detection circuit that can easily detect a disconnection of a ground wire incorporated in an automobile charging system without using a communication line. Another object of the present invention is to provide a ground wire breakage detection circuit that can be shared during both 100V charging and 200V charging.

上記の課題を解決するためになされた本発明は、第１の電源線と第２の電源線とアース線とを含む自動車用充電システムのアース線の断線検出回路であって、アース線と第１の電源線との線間電圧を検出する第１の検出回路と、アース線と第２の電源線との線間電圧を検出する第２の検出回路とを備え、これらの検出回路は分圧抵抗を備え、かつそれぞれの分圧抵抗と電源線との間にダイオードを介在させたことを特徴とするものである。なおこの断線検出回路は、充電ケーブルの途中、あるいは充電ボックスの内部に組み込むことができる。   The present invention, which has been made to solve the above problems, is a disconnection detection circuit for a ground wire of a vehicle charging system including a first power wire, a second power wire, and a ground wire. A first detection circuit for detecting a line voltage between the first power supply line and a second detection circuit for detecting a line voltage between the ground line and the second power supply line. A voltage resistor is provided, and a diode is interposed between each voltage dividing resistor and the power supply line. The disconnection detection circuit can be incorporated in the middle of the charging cable or in the charging box.

また、請求項３に記載の本発明の断線検出回路は、第１の電源線と第２の電源線とアース線とを含む自動車用充電システムのアース線の断線検出回路であって、前記断線検出回路はアース線と第１の電源線との線間電圧を検出する検出回路からなり、該検出回路は分圧抵抗と、該分圧抵抗と電源線との間に介在させたダイオードとからなるものとしてもよい。   According to a third aspect of the present invention, there is provided a disconnection detection circuit according to the present invention, which is a disconnection detection circuit for a ground wire of an automotive charging system including a first power supply line, a second power supply line, and a ground wire. The detection circuit includes a detection circuit that detects a line voltage between the ground line and the first power supply line. The detection circuit includes a voltage dividing resistor and a diode interposed between the voltage dividing resistor and the power supply line. It may be.

本発明の自動車用充電システムのアース線の断線検出回路によれば、給電電圧が異なる場合にも検出点に同じ電位差が現れるので、１００Ｖ充電時にも２００Ｖ充電時にもアース線の断線を簡便かつ正確に検出することができる。しかもそれぞれの分圧抵抗と電源線との間にダイオードを介在させたことにより、アース線の断線時にライン電圧が検出回路に回りこむことを防止することができる。本発明の回路は小型かつ安価であるから、自動車用充電ケーブルの内部に組み込むことができ、アース線の断線に伴う感電事故の防止に効果的である。   According to the ground wire breakage detection circuit of the vehicle charging system of the present invention, the same potential difference appears at the detection point even when the power supply voltage is different. Therefore, the ground wire breakage can be easily and accurately performed at both 100V charge and 200V charge. Can be detected. In addition, by interposing a diode between each voltage dividing resistor and the power supply line, it is possible to prevent the line voltage from flowing into the detection circuit when the ground line is disconnected. Since the circuit of the present invention is small and inexpensive, it can be incorporated in a charging cable for automobiles, and is effective in preventing an electric shock accident due to disconnection of the ground wire.

また、請求項３に記載の本発明の断線検出回路は、第１の電源線と第２の電源線とアース線とを含む自動車用充電システムのアース線の断線検出回路であって、前記断線検出回路はアース線と第１の電源線との線間電圧を検出する検出回路からなり、該検出回路は分圧抵抗と、該分圧抵抗と電源線との間に介在させたダイオードとからなるものとすることにより、非常に簡単な構成でアース線の断線を検出することができるものである。   According to a third aspect of the present invention, there is provided a disconnection detection circuit according to the present invention, which is a disconnection detection circuit for a ground wire of an automotive charging system including a first power supply line, a second power supply line, and a ground wire. The detection circuit includes a detection circuit that detects a line voltage between the ground line and the first power supply line. The detection circuit includes a voltage dividing resistor and a diode interposed between the voltage dividing resistor and the power supply line. As a result, the disconnection of the ground wire can be detected with a very simple configuration.

以下に本発明の好ましい実施形態を示す。
図１において、１は分電盤、２はこの分電盤１の二次側に接続された充電ボックス、３は自動車用充電ケーブル、４は電気自動車である。充電時には自動車用充電ケーブル３の先端は電気自動車４の受電コネクタ５に接続される。この自動車用充電ケーブル３の途中には保護装置６が取り付けられている。この保護装置６の内部には、漏電検出部７と接点８の開閉制御部９とが収納されている。自動車用充電システムとは前記分電盤１から充電ボックス２を経由して自動車用充電ケーブル３にて電気自動車４に至るまでの一連の充電システムを意味するものである。 Preferred embodiments of the present invention are shown below.
In FIG. 1, 1 is a distribution board, 2 is a charging box connected to the secondary side of this distribution board 1, 3 is a charging cable for automobiles, and 4 is an electric vehicle. At the time of charging, the tip of the automobile charging cable 3 is connected to the power receiving connector 5 of the electric vehicle 4. A protection device 6 is attached in the middle of the automobile charging cable 3. Inside the protective device 6, a leakage detecting unit 7 and an opening / closing control unit 9 for the contact 8 are accommodated. The vehicle charging system means a series of charging systems from the distribution board 1 through the charging box 2 to the electric vehicle 4 through the vehicle charging cable 3.

この開閉制御部９に電気自動車４から開閉信号を送るために、自動車用充電ケーブル３の保護装置６よりも先端側には通信線１０が組み込まれている。また自動車用充電ケーブル３の内部には、第１の電源線１１と第２の電源線１２とアース線１３とが組み込まれている。なお１００Ｖ充電の場合には、第１の電源線１１と第２の電源線１２とは分電盤１の二次側のＬ１相とＮ相に接続され、２００Ｖ充電の場合には、第１の電源線１１と第２の電源線１２とは分電盤１の二次側のＬ１相とＬ２相に接続される。このほか、保護装置６の内部には本発明に係る断線検出回路１４と断線判定回路１５とが収納されている。以下にその詳細を、図２を参照しつつ説明する。   In order to send an open / close signal from the electric vehicle 4 to the open / close control unit 9, a communication line 10 is incorporated on the distal end side of the protection device 6 of the automotive charging cable 3. In addition, a first power line 11, a second power line 12, and a ground line 13 are incorporated inside the automobile charging cable 3. In the case of 100V charging, the first power supply line 11 and the second power supply line 12 are connected to the L1 phase and the N phase on the secondary side of the distribution board 1, and in the case of 200V charging, The power supply line 11 and the second power supply line 12 are connected to the L1 phase and the L2 phase on the secondary side of the distribution board 1. In addition, a breakage detection circuit 14 and a breakage determination circuit 15 according to the present invention are housed in the protective device 6. The details will be described below with reference to FIG.

図２に示すように、本発明に係る断線検出回路１４は、第１の検出回路１６と第２の検出回路１７とを備えている。第１の検出回路１６は、第１の電源線１１とアース線１３との間に、ダイオード１８、第１分圧抵抗１９、第２分圧抵抗２０を直列に接続したものである。また第２の検出回路１７は、第２の電源線１２とアース線１３との間に、ダイオード２１、第３分圧抵抗２２、第４分圧抵抗２３を直列に接続したものである。双方の検出回路１６、１７はアース線１３に並列接続されている。なおダイオード１８とダイオード２１は、図２に示すように同一方向とする。そして各分圧抵抗の中間点を検出点Ａ、Ｂとし、これらの点において検出された電圧（アース線１３との電位差）を断線判定回路１５に出力している。   As shown in FIG. 2, the disconnection detection circuit 14 according to the present invention includes a first detection circuit 16 and a second detection circuit 17. In the first detection circuit 16, a diode 18, a first voltage dividing resistor 19, and a second voltage dividing resistor 20 are connected in series between the first power supply line 11 and the ground line 13. The second detection circuit 17 includes a diode 21, a third voltage dividing resistor 22, and a fourth voltage dividing resistor 23 connected in series between the second power supply line 12 and the ground line 13. Both detection circuits 16 and 17 are connected in parallel to the ground wire 13. The diode 18 and the diode 21 are in the same direction as shown in FIG. The intermediate points of the voltage dividing resistors are set as detection points A and B, and the voltage detected at these points (potential difference from the ground wire 13) is output to the disconnection determination circuit 15.

なお、この実施形態では１００Ｖ充電の場合と２００Ｖ充電の場合とでは第２の電源線１２の相が変わることとなるが、第１分圧抵抗１９、第２分圧抵抗２０の抵抗値は、第３分圧抵抗２２、第４分圧抵抗２３の抵抗値と同一としておけばよい。以下にこの回路の作用を説明する。   In this embodiment, the phase of the second power supply line 12 changes between 100 V charging and 200 V charging, but the resistance values of the first voltage dividing resistor 19 and the second voltage dividing resistor 20 are as follows. The resistance values of the third voltage dividing resistor 22 and the fourth voltage dividing resistor 23 may be the same. The operation of this circuit will be described below.

先ず１００Ｖ充電の場合には、上記したように第１の電源線１１はＬ１相に接続され、第２の電源線１２はＮ相に接続される。この状態においてアース線１３が健全であれば、第１の検出回路１６の両端にはＬ１相の対地電圧である１００Ｖが加わることとなり、検出点Ａでは抵抗の分圧比によって定まる一定電圧（例えば１Ｖ）が検出される。しかしアース線１３が断線している場合にはダイオード１８とダイオード２１との作用によって第１の検出回路１６には電流が流れず、従って検出点ＡではゼロＶが検出される。このように１００Ｖ充電の場合には、検出点Ａにおける検出電圧が一定電圧であるかゼロであるかによってアース線１３の断線の有無を検出できる。断線判定回路１５が断線と判定した場合には、開閉制御部９が接点８を開いて充電を禁止あるいは停止する。なお、１００Ｖ充電の場合にはＮ相に接続された第２の電源線１２の対地電圧はゼロＶであるから、アース線１３が健全であっても第２の検出回路１７のＢ点における電圧はゼロである。   First, in the case of 100V charging, as described above, the first power supply line 11 is connected to the L1 phase, and the second power supply line 12 is connected to the N phase. If the ground wire 13 is healthy in this state, 100 V, which is the ground voltage of the L1 phase, is applied to both ends of the first detection circuit 16, and at the detection point A, a constant voltage (for example, 1 V) determined by the resistance voltage dividing ratio. ) Is detected. However, when the ground wire 13 is disconnected, no current flows through the first detection circuit 16 due to the action of the diode 18 and the diode 21, and therefore zero V is detected at the detection point A. Thus, in the case of 100V charge, the presence or absence of the disconnection of the ground wire 13 can be detected depending on whether the detection voltage at the detection point A is a constant voltage or zero. When the disconnection determination circuit 15 determines that the disconnection has occurred, the open / close control unit 9 opens the contact 8 to prohibit or stop charging. In the case of 100 V charging, the ground voltage of the second power supply line 12 connected to the N phase is zero V, so that the voltage at the point B of the second detection circuit 17 even if the ground line 13 is healthy. Is zero.

なお、分電盤内で電源線１１と電源線１２との接続が逆になった場合には、正常時の一定電圧は検出点Ｂに現れ、検出点Ａの電圧がゼロとなる。よって１００Ｖ充電の場合には、検出点Ａ及びＢのいずれの電圧もゼロとなった場合に異常と判定する。また、検出点Ａの断線判定回路１５の素子と検出点Ｂの断線判定回路１５の素子を全く同じ構成とすることができる。   When the connection between the power supply line 11 and the power supply line 12 is reversed in the distribution board, a constant voltage at normal time appears at the detection point B, and the voltage at the detection point A becomes zero. Therefore, in the case of 100V charge, it is determined that there is an abnormality when both voltages at the detection points A and B become zero. Further, the element of the disconnection determination circuit 15 at the detection point A and the element of the disconnection determination circuit 15 at the detection point B can have exactly the same configuration.

次に２００Ｖ充電の場合には、上記したように第１の電源線１１はＬ１相に接続され、第２の電源線１２はＬ２相に接続される。この状態においてアース線１３が健全であれば、第１の検出回路１６の両端には１００Ｖ充電の場合と同じくＬ１相の対地電圧である１００Ｖが加わることとなり、検出点Ａでは抵抗の分圧比によって定まる一定電圧（例えば１Ｖ）が検出される。また第２の検出回路１７の両端にはＬ２相の対地電圧である１００Ｖが加わることとなり、検出点Ｂでは抵抗の分圧比によって定まる一定電圧が検出される。上記したように第１分圧抵抗１９、第２分圧抵抗２０の抵抗値を第３分圧抵抗２２、第４分圧抵抗２３の抵抗値と同一としておけば、検出点Ｂにおいても例えば１Ｖ）が検出される。   Next, in the case of 200V charging, as described above, the first power supply line 11 is connected to the L1 phase, and the second power supply line 12 is connected to the L2 phase. If the ground wire 13 is healthy in this state, 100 V, which is the ground voltage of the L1 phase, is applied to both ends of the first detection circuit 16 as in the case of 100 V charge. A fixed constant voltage (for example, 1 V) is detected. In addition, 100 V, which is an L2 phase ground voltage, is applied to both ends of the second detection circuit 17, and a constant voltage determined by the resistance voltage division ratio is detected at the detection point B. As described above, if the resistance values of the first voltage dividing resistor 19 and the second voltage dividing resistor 20 are set to be the same as the resistance values of the third voltage dividing resistor 22 and the fourth voltage dividing resistor 23, the detection point B is also 1 V, for example. ) Is detected.

このようにＬ１相の対地電圧とＬ２相の対地電圧とはともに１００Ｖの一定値であるから、アース線１３が健全であれば、検出点Ａでも検出点Ｂでも同一の一定電圧が検出される。またアース線１３が断線している場合には、ダイオード１８とダイオード２１との作用によっていずれの検出回路にも電流が流れないので検出点Ａでも検出点Ｂでも検出電圧は０Ｖとなる。このため、検出点Ａと検出点Ｂの検出電圧によってアース線１３の断線を簡便かつ正確に検出できることとなり、断線判定回路１５が断線と判定した場合には、開閉制御部９が接点８を開いて充電を禁止あるいは停止する。なお断線の判断は、検出点Ａ、Ｂにおける検出電圧がともに０Ｖとなった場合に行えばよい。従って、２００Ｖで給電する場合にも全く同じ断線検出回路１５を使用することが可能となり、充電ボックス２に接続するコネクタの形状をアダプタ等で変換するのみで共通の充電ケーブル３を使用することが可能となる。   Thus, since the ground voltage of the L1 phase and the ground voltage of the L2 phase are both constant values of 100 V, the same constant voltage is detected at both the detection point A and the detection point B if the ground wire 13 is healthy. . When the ground wire 13 is broken, no current flows through any of the detection circuits due to the action of the diode 18 and the diode 21, so that the detection voltage is 0 V at both the detection point A and the detection point B. For this reason, the disconnection of the ground wire 13 can be detected easily and accurately based on the detection voltages at the detection points A and B. When the disconnection determination circuit 15 determines that the disconnection has occurred, the switching control unit 9 opens the contact 8. To prohibit or stop charging. The determination of disconnection may be performed when the detection voltages at detection points A and B are both 0V. Therefore, the same disconnection detection circuit 15 can be used even when power is supplied at 200 V, and the common charging cable 3 can be used only by converting the shape of the connector connected to the charging box 2 with an adapter or the like. It becomes possible.

なお、ダイオード１８、２１を省略した場合には第１の検出回路１６と第２の検出回路１７、１８との間でライン電圧の回りこみが発生し、上記した本願発明の作用効果を得ることができなくなる。   When the diodes 18 and 21 are omitted, a line voltage sneak occurs between the first detection circuit 16 and the second detection circuits 17 and 18, and the above-described effects of the present invention can be obtained. Can not be.

上記したように、本願発明の検出回路によればアース線１３の断線を簡便かつ正確に検出することができる。しかも１００Ｖ充電の場合にも２００Ｖ充電の場合にも、検出回路の切り替えは不要であり、検出点Ａ、Ｂにおける検出電圧がともに０Ｖとなった場合にアース線１３の断線と判定するという単一の判断基準によって、処理することが可能である。   As described above, according to the detection circuit of the present invention, the disconnection of the ground wire 13 can be detected easily and accurately. In addition, in both the case of 100V charging and the case of 200V charging, switching of the detection circuit is unnecessary, and it is determined that the ground wire 13 is disconnected when both of the detection voltages at the detection points A and B are 0V. It is possible to process according to the criteria.

上記した実施形態では充電ケーブル３の途中に保護装置６が設置され、その内部に検出回路１４を組み込んだものとしたが、保護装置６が充電ボックス２に組み込まれているものとしてもよい。この場合には、本発明のアース線の断線検出回路は充電ボックスから分電盤までの接続線２４の内部に組み込まれた内部のアース線と分電盤のアース端子からグランドへのアース線の断線を検出するものである。すなわち、上記実施形態では、自動車用充電システムとは前記分電盤１から充電ボックス２を経由して保護装置６までの自動車用充電システムのアース線の断線を検出するものである。   In the above-described embodiment, the protection device 6 is installed in the middle of the charging cable 3 and the detection circuit 14 is incorporated therein. However, the protection device 6 may be incorporated in the charging box 2. In this case, the ground wire breakage detection circuit according to the present invention includes an internal ground wire incorporated in the connection line 24 from the charging box to the distribution board, and an earth wire from the ground terminal of the distribution board to the ground. This is to detect disconnection. In other words, in the above embodiment, the vehicle charging system detects the disconnection of the ground wire of the vehicle charging system from the distribution board 1 to the protection device 6 via the charging box 2.

なお、図３に示すように、第１の電源線１１と第２の電源線１２とアース線１３とを含む自動車用充電ケーブルのアース線の断線検出回路１６は、アース線と第１の電源線との線間電圧のみを検出するものとしてもよい。この場合には、検出点Ａの電圧がゼロとなった場合に断線があったものと判定する断線判定回路を設ければよい。これによって、非常に簡単な構成でアース線の断線を検出することができるものである。   As shown in FIG. 3, the disconnection detection circuit 16 for the ground wire of the automobile charging cable including the first power line 11, the second power line 12, and the ground line 13 includes the ground line and the first power source. Only the line voltage to the line may be detected. In this case, a disconnection determination circuit that determines that a disconnection has occurred when the voltage at the detection point A becomes zero may be provided. As a result, the disconnection of the ground wire can be detected with a very simple configuration.

本発明の好ましい実施形態を示す全体図である。1 is an overall view showing a preferred embodiment of the present invention. 本発明の要部を示す回路図である。It is a circuit diagram which shows the principal part of this invention. 請求項３の発明の実施形態の要部を示す回路図である。It is a circuit diagram which shows the principal part of embodiment of invention of Claim 3.

符号の説明Explanation of symbols

１ 分電盤
２ 充電ボックス
３ 自動車用充電ケーブル
４ 電気自動車
５ 受電コネクタ
６ 保護装置
７ 漏電検出部
８ 接点
９ 開閉制御部
１０ 通信線
１１ 第１の電源線
１２ 第２の電源線
１３ アース線
１４ 断線検出回路
１５ 断線判定回路
１６ 第１の検出回路
１７ 第２の検出回路
１８ ダイオード
１９ 第１分圧抵抗
２０ 第２分圧抵抗
２１ ダイオード
２２ 第３分圧抵抗
２３ 第４分圧抵抗
２４ 接続線 DESCRIPTION OF SYMBOLS 1 Distribution board 2 Charging box 3 Car charging cable 4 Electric vehicle 5 Power receiving connector 6 Protection device 7 Leakage detection part 8 Contact 9 Opening / closing control part 10 Communication line 11 1st power supply line 12 2nd power supply line 13 Grounding line 14 Disconnection detection circuit 15 Disconnection determination circuit 16 First detection circuit 17 Second detection circuit 18 Diode 19 First voltage dividing resistor 20 Second voltage dividing resistor 21 Diode 22 Third voltage dividing resistor 23 Fourth voltage dividing resistor 24 Connection line

Claims (3)

第１の電源線と第２の電源線とアース線とを含む自動車用充電システムのアース線の断線検出回路であって、
アース線と第１の電源線との線間電圧を検出する第１の検出回路と、アース線と第２の電源線との線間電圧を検出する第２の検出回路とを備え、
これらの検出回路は分圧抵抗を備え、
かつそれぞれの分圧抵抗と電源線との間にダイオードを介在させたことを特徴とする自動車用充電システムのアース線の断線検出回路。 A disconnection detection circuit for a ground wire of a vehicle charging system including a first power wire, a second power wire, and a ground wire,
A first detection circuit for detecting a line voltage between the ground line and the first power line; and a second detection circuit for detecting a line voltage between the ground line and the second power line.
These detection circuits have voltage divider resistors,
A ground wire disconnection detection circuit for an automotive charging system, wherein a diode is interposed between each voltage dividing resistor and the power supply line. 断線検出回路が充電ケーブルの途中、あるいは充電ボックスの内部に組み込まれたものであることを特徴とする請求項１に記載の自動車用充電システムのアース線の断線検出回路。   The disconnection detection circuit for a grounding wire in a vehicle charging system according to claim 1, wherein the disconnection detection circuit is incorporated in the middle of the charging cable or in the charging box. 第１の電源線と第２の電源線とアース線とを含む自動車用充電システムのアース線の断線検出回路であって、
前記断線検出回路はアース線と第１の電源線との線間電圧を検出する検出回路からなり、
該検出回路は分圧抵抗と、該分圧抵抗と電源線との間に介在させたダイオードとからなることを特徴とする自動車用充電システムのアース線の断線検出回路。 A disconnection detection circuit for a ground wire of a vehicle charging system including a first power wire, a second power wire, and a ground wire,
The disconnection detection circuit comprises a detection circuit for detecting a line voltage between the ground line and the first power supply line,
The detection circuit comprises a voltage dividing resistor and a diode interposed between the voltage dividing resistor and a power supply line.
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CN115257448A (en) * 2022-06-24 2022-11-01 智己汽车科技有限公司 Monitoring system and monitoring method for direct-current charging process of electric automobile
CN115257448B (en) * 2022-06-24 2024-05-14 智己汽车科技有限公司 Monitoring system and monitoring method for direct current charging process of electric automobile

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