JPH08320352A - Earth leakage detection device - Google Patents
Earth leakage detection deviceInfo
- Publication number
- JPH08320352A JPH08320352A JP7181287A JP18128795A JPH08320352A JP H08320352 A JPH08320352 A JP H08320352A JP 7181287 A JP7181287 A JP 7181287A JP 18128795 A JP18128795 A JP 18128795A JP H08320352 A JPH08320352 A JP H08320352A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- leakage
- leakage detection
- resistor
- earth leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気自動車、電車、ト
ロリーバスなどの高圧直流電源を動力とする車両等に利
用する漏電検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage detecting device for use in vehicles such as electric vehicles, trains, trolleybuses, etc., which are powered by a high voltage DC power supply.
【０００２】[0002]
【従来の技術】図５は従来の漏電検出装置の構成を示し
ている。図５において、２１はバッテリー等で構成され
た高圧直流電源である。２２、２３及び２４はそれぞれ
抵抗値Ｒ1、Ｒ2、ＲSを有する抵抗であり、２５は抵抗
２４の両端に生じる検出電圧である。2. Description of the Related Art FIG. 5 shows the structure of a conventional leakage detecting device. In FIG. 5, reference numeral 21 is a high-voltage DC power source composed of a battery or the like. Reference numerals 22, 23, and 24 are resistors having resistance values R 1 , R 2 , and R S , respectively, and 25 is a detection voltage generated across the resistor 24.
【０００３】次に上記従来例の動作について説明する。
一般に電気自動車に使用される２００〜３００Ｖの直流
電源は、人が高圧電源に触れても感電しないように、車
両のボデーグランドから電気的に分離されたフローティ
ング状態になっている。しかしながら、絶縁破壊が起き
ている場合には、人が高圧系に触れると電流が流れるバ
スができるため、感電してしまう。ところが、高電圧系
とグランド間に絶縁破壊が発生しても、人が高圧系に触
れない限り、高電圧系とグランドとが分離されているた
め、絶縁破壊を起こした抵抗には電流も電圧も生じない
ため、漏電が検出できないことになる。これをできるよ
うにしたのが、図５に示す高圧直流電源２１に対し抵抗
２４をグランドに接地して、中性点をとる構成である。Next, the operation of the above conventional example will be described.
Generally, a DC power supply of 200 to 300 V used in an electric vehicle is in a floating state electrically separated from the body ground of the vehicle so that a person does not get an electric shock even if the person touches the high voltage power supply. However, when a dielectric breakdown occurs, when a person touches the high-voltage system, a bus in which a current flows is created, which causes an electric shock. However, even if a dielectric breakdown occurs between the high-voltage system and the ground, unless a person touches the high-voltage system, the high-voltage system and the ground are separated. Therefore, the leakage cannot be detected. This is made possible by a configuration in which the resistor 24 is grounded to the high voltage DC power supply 21 shown in FIG.
【０００４】以下、この抵抗中性点にグランドをとる回
路構成について図６を参照して説明する。図６におい
て、２１〜２５は図５と同じであり、２６は絶縁破壊抵
抗（ｒ）、２７は人体抵抗（Ｚ）である。図６では高圧
直流電源２１のマイナス側が絶縁破壊を起こしている状
態である。高圧直流電源２１の電圧を＋Ｂボルト、抵抗
２２及び２３の抵抗値Ｒ1、Ｒ2を絶縁破壊抵抗２６の抵
抗値（ｒ）に比べ十分大きくとれば、人体に流れる漏電
電流Ｉzは、 Ｉz＝＋Ｂ／（ｒ＋Ｚ） （１） となり、人体抵抗２７の抵抗値Ｚは湿気などの環境によ
って異なることもあるが、Ｚ＝０とした場合に人体に流
れる漏電電流Ｉzが最大となる。A circuit configuration in which the resistance neutral point is grounded will be described below with reference to FIG. In FIG. 6, 21 to 25 are the same as those in FIG. 5, 26 is a dielectric breakdown resistance (r), and 27 is a human body resistance (Z). In FIG. 6, the negative side of the high-voltage DC power supply 21 is in a state of causing dielectric breakdown. If the voltage of the high-voltage DC power supply 21 is + B volt and the resistance values R 1 and R 2 of the resistors 22 and 23 are sufficiently larger than the resistance value (r) of the dielectric breakdown resistance 26, the leakage current I z flowing through the human body is I z = + B / (r + Z) (1), and the resistance value Z of the human body resistance 27 may vary depending on the environment such as humidity, but when Z = 0, the leakage current I z flowing through the human body becomes the maximum.
【０００５】次に、人体が高圧系に触れていないとき、
すなわち人体抵抗２７の抵抗値Ｚが無限大のとき、絶縁
破壊によって生じる抵抗２４の検出電圧２５（Ｖ1）の
値を求める。当然のことながら、絶縁破壊が起こってい
ないときの抵抗２６の抵抗値ｒは無限大なので、検出電
圧２５には電圧が発生しないが、絶縁破壊が発生してい
るときは、抵抗２２及び２３の抵抗値Ｒ1、Ｒ2を抵抗２
４及び２６の抵抗値Ｒ S及びｒより大きく設定すると、
ボデーグランドを介して抵抗２２、２４及び２６を流れ
る漏電電流（ｉ）は、 ｉ＝＋Ｂ／（Ｒ1＋ＲS＋ｒ） （２） となる。したがって、抵抗２４に生じる検出電圧２５の
値Ｖ1は、 Ｖ1＝＋Ｂ×ＲS／（Ｒ1＋ＲS＋ｒ） （３） となり、（１）、（３）式より漏電電流に対応した検出
電圧Ｖ1が求められ、これにより漏電を検出することが
できる。Next, when the human body is not in contact with the high pressure system,
That is, when the resistance value Z of the human body resistance 27 is infinite, insulation
The detection voltage 25 (V1)of
Find the value. Of course, there is a breakdown
Since the resistance value r of the resistor 26 when it is not present is infinite,
No voltage is generated at pressure 25, but dielectric breakdown has occurred.
The resistance value R of the resistors 22 and 231, R2Resistance 2
Resistance value 4 and 26 SIf it is set larger than and r,
Flow through resistors 22, 24 and 26 through body ground
The leakage current (i) is: i = + B / (R1+ RS+ R) (2). Therefore, the detection voltage 25 generated in the resistor 24
Value V1Is V1= + B × RS/ (R1+ RS+ R) (3), which is the detection corresponding to the leakage current from the equations (1) and (3).
Voltage V1It is required that
it can.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の漏電検出装置では、漏電を検出するための漏電検出
用の抵抗２４を常時ボデーグランドにおとしておき、絶
縁破壊が起きたときに抵抗２４に電流が流れるように構
成されおり、漏電検出装置自身によって常時漏電状態を
発生させて漏電検出をするものであり、漏電検出を行わ
ない場合にも暗電流として、所定値以上（例えば２００
μＡ〜５００μＡ）の暗電流により漏電が常時起こって
いる状態にあった。よって、この暗電流により常時漏電
状態を発生させているものであり、何等かの原因で高抵
抗値の抵抗２２、２３の抵抗値が非常に小さくなった場
合に、使用者が高電圧系に触れと危険領域に入るという
問題が生じる。このため、上記従来の漏電検出装置では
高抵抗値の抵抗２２、２３の保護もしくは抵抗値を検出
するための回路が別途必要となるものであった。However, in the above-mentioned conventional earth leakage detecting device, the earth leakage detecting resistor 24 for detecting the earth leakage is always left in the body ground, and the resistor 24 is connected to the resistor 24 when dielectric breakdown occurs. An electric current is configured to flow, and the electric leakage detection device itself constantly generates an electric leakage state to detect electric leakage. Even when the electric leakage detection is not performed, the dark current is a predetermined value or more (for example, 200
The leakage current was constantly occurring due to the dark current of μA to 500 μA). Therefore, this dark current constantly causes an electric leakage state, and when the resistance value of the resistors 22 and 23 having a high resistance value becomes very small for some reason, the user can switch to a high voltage system. The problem of touching and entering the danger zone arises. For this reason, in the above-mentioned conventional leakage detection device, a circuit for protecting the resistors 22 and 23 having a high resistance value or detecting the resistance value is separately required.
【０００７】本発明は、上記従来の問題を除去するもの
であり、簡単な回路構成により使用者に対する安全を確
保するとともに、漏電が発生した場合には漏電を確実に
検出することができる優れた漏電検出装置を提供するも
のである。The present invention eliminates the above-mentioned conventional problems and is excellent in that it is possible to ensure the safety for the user with a simple circuit configuration and to reliably detect the leakage when it occurs. An electrical leakage detection device is provided.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記目的を達
成するために、車両に搭載されてその車両のボデーグラ
ンドから電気的に分離された高圧直流電源と、この高圧
直流電源のプラス側とマイナス側との間に直列に接続さ
れた２個の高抵抗値の保護用抵抗と、一端が前記保護用
抵抗の接続部に接続した漏電検出抵抗と、この漏電検出
抵抗の他端とボデーグランドとの接続を開閉するスイッ
チ手段と、前記漏電検出抵抗の両端電圧を測定する電圧
測定部と、この電圧測定部の出力より漏電を判定する漏
電判定部とを備えたものである。In order to achieve the above object, the present invention provides a high-voltage DC power source mounted on a vehicle and electrically separated from the body ground of the vehicle, and a positive side of the high-voltage DC power source. Two protection resistors having a high resistance value connected in series between the negative side and the negative side, a leakage detection resistor having one end connected to the connection portion of the protection resistor, and the other end of the leakage detection resistor and the body. It is provided with a switch means for opening and closing the connection with the ground, a voltage measuring section for measuring the voltage across the leakage detecting resistor, and a leakage determining section for determining leakage from the output of the voltage measuring section.
【０００９】さらに、本発明は、それぞれ前記保護用抵
抗と直列接続された２個の高抵抗と、それぞれ前記高抵
抗の両端に接続された２個のスイッチ手段とを備えたも
のである。Further, the present invention comprises two high resistances each connected in series with the protection resistance, and two switch means connected to both ends of the high resistance, respectively.
【００１０】[0010]
【作用】したがって本発明によれば、スイッチ手段によ
り漏電検出抵抗とボデーグランドとの接続を開閉させる
ことにより、漏電検出装置自身による絶縁破壊を常時で
なく間欠的に短時間だけ発生させるようにしているた
め、何等かの原因で高抵抗値の抵抗２および３の抵抗値
が非常に小さくなった場合にも、使用者に対する安全を
確保できるとともに、漏電が発生した場合にはこれを確
実に検出することができる。また、漏電を検出する時の
み保護用抵抗と直列に高抵抗を接続することにより、漏
電検出用の暗電流をさらに小さくすることができる。Therefore, according to the present invention, the switch means is used to open and close the connection between the leakage detection resistor and the body ground so that the dielectric breakdown by the leakage detection device itself does not occur all the time but intermittently for a short time. Therefore, even if the resistance values of the high resistance resistors 2 and 3 become extremely small for some reason, the safety for the user can be ensured and the leakage current can be detected without fail. can do. Further, by connecting the high resistance in series with the protection resistor only when detecting the leakage, the dark current for detecting the leakage can be further reduced.
【００１１】[0011]
【実施例】以下に本発明における第１の実施例について
図１〜図３を参照して説明する。図１は実施例の構成を
示すものであり、図２は漏電が発生した場合を示してい
る。図１及び図２において、１は高圧直流電源であり、
この高圧直流電源１は２００〜３００Ｖのバッテリー等
で構成されている。２及び３は抵抗であり高抵抗値
Ｒ1、Ｒ2を有する。４は漏電検出抵抗であり抵抗値ＲS
である。５は電圧測定部であり、漏電検出抵抗４の両端
電圧を測定する。６は漏電判定部であり、この漏電判定
部６は電圧測定部５からの出力と予め設定された基準値
とを比較して、電圧測定部５からの出力が基準値より大
きい場合に漏電検出出力７を出力するものである。８は
スイッチであり、このスイッチ８は漏電判定部６により
制御されて間欠的に開閉するものである。９は高圧直流
電源１に対してボデーグランドに漏電した漏電抵抗
（ｒ）であり、１０は使用者が高電圧系に触れたときに
発生する人体抵抗（ｚ）である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a configuration of the embodiment, and FIG. 2 shows a case where an electric leakage occurs. 1 and 2, 1 is a high-voltage DC power supply,
This high-voltage DC power supply 1 is composed of a battery of 200 to 300V or the like. 2 and 3 are resistors having high resistance values R 1 and R 2 . Reference numeral 4 is a leakage detection resistor, which has a resistance value R S
Is. A voltage measuring unit 5 measures the voltage across the leakage detection resistor 4. Reference numeral 6 is a leakage determining unit, which compares the output from the voltage measuring unit 5 with a preset reference value, and detects the leakage when the output from the voltage measuring unit 5 is larger than the reference value. The output 7 is output. Reference numeral 8 denotes a switch, and the switch 8 is controlled by the leakage determining unit 6 to open and close intermittently. Reference numeral 9 is a leakage resistance (r) that leaks to the body ground with respect to the high-voltage DC power supply 1, and 10 is a human body resistance (z) generated when the user touches the high-voltage system.
【００１２】次に、上記実施例の動作について説明す
る。図１において、高圧直流電源１に対してボデーグラ
ンドに漏電しているか否かを検出する場合には、漏電判
定部６の制御によりスイッチ８を閉じて、漏電検出抵抗
４の一端をボデーグランドに接地して漏電検出が可能な
状態とする。Next, the operation of the above embodiment will be described. In FIG. 1, when it is detected whether or not the high-voltage DC power supply 1 is leaking to the body ground, the switch 8 is closed by the control of the leak determining unit 6, and one end of the leak detecting resistor 4 is set to the body ground. Grounded so that leakage can be detected.
【００１３】絶縁破壊が発生していないときは、図１に
示すように、高圧直流電源１はボデーグランドに対して
フローティング状態にあり、漏電検出抵抗４には電流が
流れていないため、漏電検出抵抗４の両端には電圧は発
生しない。絶縁破壊が発生した場合には、図２に示すよ
うに高圧直流電源１に対して漏電抵抗９が発生しする。
図５に示す状態と同様に、ボデーグランドを介して抵抗
２、漏電検出抵抗４及び漏電抵抗９に漏電電流（ｉ）が
流れ、漏電検出抵抗４の両端に検出電圧（Ｖ1）が発生
する。When no dielectric breakdown occurs, as shown in FIG. 1, the high voltage DC power supply 1 is in a floating state with respect to the body ground, and no current flows through the leakage detection resistor 4, so that the leakage detection is performed. No voltage is generated across the resistor 4. When the dielectric breakdown occurs, a leakage resistance 9 is generated for the high voltage DC power supply 1 as shown in FIG.
Similar to the state shown in FIG. 5, the leakage current (i) flows through the resistor 2, the leakage detection resistor 4, and the leakage resistance 9 through the body ground, and the detection voltage (V 1 ) is generated across the leakage detection resistor 4. .
【００１４】このときの、漏電電流（ｉ）及び検出電圧
（Ｖ1）は、上記（２）及び（３）式より求められる。
電圧測定部５において検出電圧（Ｖ1）が検出され、こ
の電圧測定部５の出力を漏電判定部６に印加する。漏電
判定部６では電圧測定部５からの出力と予め設定された
基準値とを比較して漏電を判定する。漏電が発生して電
圧測定部５からの出力が基準値より大きくなった場合に
は、漏電検出出力７を出力する。At this time, the leakage current (i) and the detection voltage (V 1 ) are obtained from the above equations (2) and (3).
The detection voltage (V 1 ) is detected by the voltage measuring unit 5, and the output of this voltage measuring unit 5 is applied to the leakage determining unit 6. The leakage determining unit 6 compares the output from the voltage measuring unit 5 with a preset reference value to determine leakage. When the leakage occurs and the output from the voltage measuring unit 5 becomes larger than the reference value, the leakage detection output 7 is output.
【００１５】スイッチ８は、漏電判定部６により制御さ
れて所定時間経過後に「開」となる。スイッチ８が開放
となると、高圧直流電源１はボデーグランドに電流が流
れる径路が遮断される。当然のことながらスイッチ８が
「開」の場合には、漏電は検出できなことになる。図３
は漏電判定部６により制御されるスイッチ８の開閉状態
を示すものであり、スイッチ８の「閉時間」は約５０ｍ
ｓｅｃ、「開時間」は約１ｓｅｃで制御される。The switch 8 is controlled by the leakage determining unit 6 and becomes "open" after a lapse of a predetermined time. When the switch 8 is opened, the high voltage DC power supply 1 cuts off the path through which the current flows to the body ground. As a matter of course, when the switch 8 is “open”, the electric leakage cannot be detected. FIG.
Indicates the open / closed state of the switch 8 controlled by the leakage determination unit 6, and the “close time” of the switch 8 is about 50 m.
sec, the "open time" is controlled at about 1 sec.
【００１６】以上のように、上記実施例においては、ス
イッチ８を間欠的に開閉することにより、漏電検出のた
め漏電検出抵抗４の絶縁破壊を常時でなく間欠的に短時
間だけ発生させるようにしている。このため、何等かの
原因で高抵抗値の抵抗２および３の抵抗値が非常に小さ
くなった場合にも、使用者に対する安全を確保できると
ともに、漏電が発生した場合にはこれを確実に検出する
ことができるものである。As described above, in the above embodiment, the switch 8 is intermittently opened / closed so that the dielectric breakdown of the leakage detection resistor 4 for the detection of leakage is not always generated but intermittently for a short time. ing. Therefore, even if the resistance values of the high resistance resistors 2 and 3 become extremely small for some reason, the safety for the user can be ensured and the leakage current can be detected with certainty. Is what you can do.
【００１７】図４は本発明の第２の実施例の構成を示す
ものである。上記第１の実施例と同一の構成について
は、同一符号を記して説明を省略する。図４において、
１１、１２は高抵抗であり、これら高抵抗１１、１２は
それぞれ高圧直流電源１のプラス側と抵抗２との間、抵
抗３と高圧直流電源１のマイナス側との間に直列接続さ
れている。１３、１４はスイッチであり、これらスイッ
チ１３、１４はそれぞれ高抵抗１１、１２の両端に接続
され、漏電判定部６により制御されて開閉動作を行うも
のである。FIG. 4 shows the configuration of the second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG.
Reference numerals 11 and 12 are high resistances, and these high resistances 11 and 12 are connected in series between the positive side of the high voltage DC power supply 1 and the resistance 2, and between the resistor 3 and the negative side of the high voltage DC power supply 1, respectively. . Reference numerals 13 and 14 are switches, and these switches 13 and 14 are connected to both ends of the high resistances 11 and 12, respectively, and are controlled by the leakage determination unit 6 to perform opening / closing operations.
【００１８】次に、第２の実施例の動作について説明す
る。漏電検出を行う場合には、漏電判定部６が図３に示
すような動作タイミングにて、スイッチ１３及びスイッ
チ１４を「閉」とする。これにより高圧直流電源１のプ
ラス側とマイナス側とは抵抗２、３及び高抵抗１１、１
２により接続された状態となり漏電検出が可能となる。
漏電しているか否かは、漏電検出抵抗４の両端の電圧を
電圧測定部５にて検出し、漏電判定部６により予め設定
された基準値と電圧測定部５の出力値とを比較して漏電
を判定する。漏電検出を行わない場合には、スイッチ１
３及びスイッチ１４を「開」としておくことにより、高
抵抗１１、１２が抵抗２、３と直列接続され、高抵抗１
１、１２は任意に大きな値を選定できるものであり、暗
電流を非常に小さくすることができる。スイッチ１３及
びスイッチ１４は、図３に示すと同様にして間欠的に開
閉することにより、一定の頻度で漏電検出ができる。Next, the operation of the second embodiment will be described. When detecting the leakage, the leakage determination unit 6 closes the switches 13 and 14 at the operation timing as shown in FIG. As a result, the positive side and the negative side of the high-voltage DC power supply 1 have resistances 2 and 3 and high resistances 11 and 1, respectively.
It becomes a connected state by 2 and the leak detection becomes possible.
Whether or not there is a leakage is detected by detecting the voltage across the leakage detection resistor 4 with the voltage measuring unit 5 and comparing the reference value preset by the leakage determining unit 6 with the output value of the voltage measuring unit 5. Determine the leakage. Switch 1 is used when leakage detection is not performed.
By setting the switch 3 and the switch 14 to “open”, the high resistances 11 and 12 are connected in series with the resistances 2 and 3, and the high resistance 1
The values 1 and 12 can be set to arbitrarily large values, and the dark current can be made extremely small. The switch 13 and the switch 14 can intermittently open and close in the same manner as shown in FIG. 3 to detect electric leakage at a constant frequency.
【００１９】以上のように、第２の実施例によれば、従
来のように、漏電検出を行わない場合にも暗電流として
所定値以上（例えば２００μＡ〜５００μＡ）の暗電流
を流すことなく、暗電流を２０μＡ以下にも小さくする
ことが可能となるものである。As described above, according to the second embodiment, the dark current of a predetermined value or more (for example, 200 μA to 500 μA) does not flow even if the leakage detection is not performed, unlike the conventional case. It is possible to reduce the dark current to 20 μA or less.
【００２０】[0020]
【発明の効果】本発明は、上記実施例より明らかなよう
に、スイッチ手段により漏電検出抵抗とボデーグランド
との接続を開閉させることにより、漏電検出装置自身に
よる絶縁破壊を常時でなく間欠的に短時間だけ発生させ
るようにしているため、何等かの原因で高抵抗値の抵抗
２および３の抵抗値が非常に小さくなった場合にも、使
用者に対する安全を確保できるとともに、漏電が発生し
た場合にはこれを確実に検出することができるという効
果を有する。As is apparent from the above-described embodiment, the present invention opens and closes the connection between the leakage detection resistor and the body ground by the switch means, so that the dielectric breakdown by the leakage detection device itself does not always occur but intermittently. Since it is generated only for a short time, even if the resistance values of the high resistance resistors 2 and 3 become extremely small for some reason, the safety for the user can be secured and the electric leakage occurs. In this case, there is an effect that this can be surely detected.
【００２１】さらに、保護用抵抗と直列接続された２個
の高抵抗と、それぞれ前記高抵抗の両端に接続された２
個のスイッチ手段とを備えることにより、漏電検出を行
わない際の暗電流を従来に比べてさらに小さくすること
ができるという効果を有するものである。Furthermore, two high resistances connected in series with the protective resistance, and two high resistances respectively connected to both ends of the high resistance.
By providing the individual switch means, it is possible to further reduce the dark current when the leakage detection is not performed as compared with the conventional one.
【図１】本発明の第１の実施例における漏電検出装置の
ブロック図FIG. 1 is a block diagram of an earth leakage detection device according to a first embodiment of the present invention.
【図２】同実施例において漏電が起きた場合を示すブロ
ック図FIG. 2 is a block diagram showing a case where an electric leakage occurs in the embodiment.
【図３】同実施例のスイッチの動作状態を示すタイミン
グ図FIG. 3 is a timing chart showing an operating state of the switch of the embodiment.
【図４】本発明の第２の実施例における漏電検出装置の
ブロック図FIG. 4 is a block diagram of an earth leakage detection device according to a second embodiment of the present invention.
【図５】従来の漏電検出装置のブロック図FIG. 5 is a block diagram of a conventional leakage detection device.
【図６】従来の漏電検出装置において漏電が起きた場合
を示すブロック図FIG. 6 is a block diagram showing a case where an electric leakage occurs in a conventional electric leakage detection device.
１ 高圧直流電源 ２ 抵抗 ３ 抵抗 ４ 漏電検出抵抗 ５ 電圧測定部 ６ 漏電検出部 ７ 漏電検出出力 ８ スイッチ ９ 漏電抵抗 １０ 人体抵抗 １１、１２ 高抵抗 １３、１４ スイッチ 1 high voltage DC power supply 2 resistance 3 resistance 4 leakage detection resistance 5 voltage measurement section 6 leakage detection section 7 leakage detection output 8 switch 9 leakage resistance 10 human body resistance 11, 12 high resistance 13, 14 switch
Claims (3)
ンドから電気的に分離された高圧直流電源と、この高圧
直流電源のプラス側とマイナス側との間に直列に接続さ
れた２個の高抵抗値の保護用抵抗と、一端が前記保護用
抵抗の接続部に接続した漏電検出抵抗と、この漏電検出
抵抗の他端とボデーグランドとの接続を開閉するスイッ
チ手段と、前記漏電検出抵抗の両端電圧を測定する電圧
測定部と、この電圧測定部の出力より漏電を判定する漏
電判定部とを備えた漏電検出装置。1. A high-voltage DC power source mounted on a vehicle and electrically separated from a body ground of the vehicle, and two high-voltage DC power sources connected in series between a positive side and a negative side of the high-voltage DC power source. A resistance protection resistor, a leakage detection resistor whose one end is connected to the connection portion of the protection resistor, switch means for opening and closing the connection between the other end of this leakage detection resistor and the body ground, and the leakage detection resistor An electric leakage detection device comprising a voltage measuring unit for measuring a voltage across both ends and an electric leakage determining unit for judging an electric leakage from an output of the voltage measuring unit.
ンドから電気的に分離された高圧直流電源と、この高圧
直流電源のプラス側とマイナス側との間に直列に接続さ
れた２個の高抵抗値の保護用抵抗と、一端が前記保護用
抵抗の接続部に接続した漏電検出抵抗と、それぞれ前記
保護用抵抗と直列接続された２個の高抵抗と、それぞれ
前記高抵抗の両端に接続された２個のスイッチ手段と、
前記漏電検出抵抗の両端電圧を測定する電圧測定部と、
この電圧測定部の出力より漏電を判定する漏電判定部と
を備えた漏電検出装置。2. A high-voltage DC power source mounted on a vehicle and electrically separated from a body ground of the vehicle, and two high-voltage DC power sources connected in series between a positive side and a negative side of the high-voltage DC power source. A protection resistor having a resistance value, an earth leakage detection resistor having one end connected to the connection portion of the protection resistor, two high resistances each connected in series with the protection resistor, and each connected to both ends of the high resistance. Two switch means,
A voltage measuring unit that measures the voltage across the leakage detection resistor,
An electrical leakage detection device comprising an electrical leakage determination unit that determines electrical leakage from the output of this voltage measurement unit.
れて間欠的に所定時間開閉することを特徴とする請求項
１又は請求項２記載の漏電検出装置。3. The earth leakage detection device according to claim 1, wherein the switch means is controlled by an earth leakage determination section to intermittently open and close for a predetermined time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18128795A JP3307173B2 (en) | 1995-03-20 | 1995-07-18 | Earth leakage detection device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6074295 | 1995-03-20 | ||
| JP7-60742 | 1995-03-20 | ||
| JP18128795A JP3307173B2 (en) | 1995-03-20 | 1995-07-18 | Earth leakage detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08320352A true JPH08320352A (en) | 1996-12-03 |
| JP3307173B2 JP3307173B2 (en) | 2002-07-24 |
Family
ID=26401797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18128795A Expired - Fee Related JP3307173B2 (en) | 1995-03-20 | 1995-07-18 | Earth leakage detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3307173B2 (en) |
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