JP2010019809A - Voltage monitoring circuit - Google Patents

Voltage monitoring circuit Download PDF

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JP2010019809A
JP2010019809A JP2008183111A JP2008183111A JP2010019809A JP 2010019809 A JP2010019809 A JP 2010019809A JP 2008183111 A JP2008183111 A JP 2008183111A JP 2008183111 A JP2008183111 A JP 2008183111A JP 2010019809 A JP2010019809 A JP 2010019809A
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resistor
battery
connected
voltage
e4
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JP4775415B2 (en )
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Daisuke Sudo
大輔 須藤
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Tdk Corp
Tdk株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voltage monitoring circuit for easily detecting disconnection in a simple configuration. <P>SOLUTION: The voltage monitoring circuit 1 for monitoring the voltages of a plurality of batteries connected in series includes: detection wires 10; first resistors Ra1-Ra4 provided for each battery E1-E4 and connected in parallel to each battery E1-E4 with a pair of detection wires A1-A4; and second resistors Rb1-Rb4 provided for each battery E1-E4 and connected in parallel to each battery E1-E4 with a pair of detection wires A1-A4. At positions for connecting the second resistors Rb1-Rb4 in each pair of the detection wires A1-A4, the second resistor Rb connected at a position nearer to the batteries E1-E4 than the first resistors Ra1-Ra4 and the second resistor Rb connected at a position nearer to the first resistors Ra1-Ra4 than the batteries E1-E4 alternately exist in order arranging the batteries E1-E4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、直列に接続された複数の電池の電圧をモニタする電圧モニタ回路に関する。 The present invention relates to a voltage monitoring circuit for monitoring a voltage of a plurality of batteries connected in series.

従来より、直列に接続された複数の電池が電源として用いられており、これらの電源における各電池の電圧をモニタする電圧モニタ回路が知られている。 Conventionally, has been used as a power supply a plurality of batteries connected in series, the voltage monitoring circuit for monitoring the voltage of each battery in these power are known. 特に、リチウムイオン二次電池等の二次電池は、充電上限電圧や、放電下限電圧を超えると、発火などを起こしたり特性が著しく劣化したりするため、個々の電圧を常時モニタする必要性が高い。 In particular, a secondary battery such as a lithium ion secondary battery, and the charging upper limit voltage, exceeds a discharge lower limit voltage, for deteriorated remarkably characteristic or cause a fire hazard, the need to monitor individual voltage constantly high.

このような電圧モニタ回路においては、図3に示すように、電池E1,E2,E3,E4の両端にそれぞれ検出線10を接続し、各一対の検出線A1,A2,A3,A4に対して第一抵抗Ra1〜Ra4を有する電圧測定器V1〜V4をそれぞれ接続し、各電池の電圧をモニタする。 In such a voltage monitoring circuit, as shown in FIG. 3, the battery E1, E2, E3, each detection line 10 at both ends of the E4 connected, each pair of detection lines A1, A2, A3, A4 a voltage measuring device V1~V4 having a first resistor Ra1~Ra4 respectively connected to monitor the voltage of each battery. 例えば、電池E2の電圧が4.2V、電池E3の電圧が3.0Vであれば、電圧測定器V2が検出する電圧は4.2V、電圧測定器V3が検出する電圧は3.0Vである。 For example, if the voltage is 4.2 V, the voltage of the battery E3 is 3.0V battery E2, the voltage which the voltage meter V2 detects the voltage detected 4.2 V, the voltage measuring instrument V3 is 3.0V . 例えばリチウムイオン二次電池では、放電下限電圧は2.5V程度であり、上限充電電圧は4.3V程度であり、電圧測定器が検出する電圧がこの範囲を超えれば、警報を発したり充電や放電を止めさせる。 For example, in the lithium ion secondary battery, the discharge lower limit voltage is about 2.5V, the upper limit charge voltage is about 4.3 V, if the voltage detected by the voltage measuring device exceeds this range, charging Ya or an alarm to stop the discharge.

ところで、このような電圧モニタ回路において、検出線が断線することがある。 Incidentally, in such a voltage monitor circuit, the detection line may be disconnected. そして、従来の電圧モニタ回路では、電圧をモニタしても断線を効率よく検出することは困難であった。 Then, in the conventional voltage monitoring circuit, it is difficult to efficiently detecting disconnection even by monitoring the voltage. 例えば、図3において、検出線10が断線しても、電圧測定器V2が検出する電圧は3.6Vであり、電圧測定器V3が検出する電圧も3.6Vである。 For example, in FIG. 3, even if the detection line 10 is disconnected, the voltage to which the voltage meter V2 detected is 3.6V, the voltage detected by the voltage measuring instrument V3 is also 3.6V. したがって、このような電圧モニタ回路が検出した電圧で断線を検知することは困難である。 Therefore, it is difficult to such a voltage monitoring circuit detects the disconnection in voltage detected. そこで、このような電圧モニタ回路において、例えば、以下の特許文献に示すように、断線検知機能を付加する方法が知られている。 Therefore, in such a voltage monitor circuit, for example, as shown in the following patent documents, a method of adding a disconnection detection function is known.
特開2001−116776号公報 JP 2001-116776 JP 特開2002−204537号公報 JP 2002-204537 JP 特開2002−343445号公報 JP 2002-343445 JP 特開2004−104989号公報 JP 2004-104989 JP 特開2004−335002号公報 JP 2004-335002 JP 特開2006−275928号公報 JP 2006-275928 JP 特開2007−139664号公報 JP 2007-139664 JP

しかしながら、従来の電圧モニタ回路で断線を検知しようとすると、複雑な構成が必要となりコスト高となる。 However, an attempt to detect a disconnection in the conventional voltage monitoring circuit, a complex configuration is cost required.

本発明は上記課題に鑑みてなされたものであり、簡易な構成でありながら断線を容易に検出できる電圧モニタ回路を提供することを目的とする。 The present invention has been made in view of the above problems, and an object thereof is to provide a voltage monitoring circuit which can easily detect a break with a simple configuration.

本発明に係るモニタ回路は、直列に接続された複数の電池の電圧をモニタする電圧モニタ回路であって、複数の電池の両端及び電池間にそれぞれ接続された検出線と、各電池に対して設けられ、各電池の両端に接続された一対の検出線により各電池と並列に接続された第一抵抗と、各電池に対して設けられ、前記各電池の両端に接続された一対の検出線により各電池と並列に接続された第二抵抗と、を備える。 Monitor circuit according to the present invention, there is provided a voltage monitoring circuit for monitoring a voltage of a plurality of batteries connected in series, and the detection line connected across and the battery of the plurality of batteries, for each battery provided, a first resistor connected in parallel to the battery by a pair of detection lines connected to both ends of each battery, provided for each cell, a pair of detection line connected to both ends of each battery comprising a second resistor connected in parallel to the battery, the by. 各一対の検出線における第二抵抗が接続される位置は、第一抵抗よりも電池に近い位置で接続された第二抵抗と、電池よりも第一抵抗に近い位置で接続された第二抵抗とが、電池が並ぶ順に交互に存在するようにされている。 Position in which the second resistor of each pair of detection lines are connected, a second resistor connected at a position near the cell than the first resistor, a second resistor connected at a position closer to the first resistance than the battery bets have been made to present alternately in the order arranged battery.

本発明によれば、検出線に異常がない場合には、各一対の検出線間には、対応する電池の電圧が印加される。 According to the present invention, when there is no abnormality in the detection line between each pair of detection line, the voltage of the corresponding battery is applied. 一方、検出線において断線が起こり、この断線箇所が、第二抵抗が接続される2つの位置である、電池に近い位置と、第一抵抗に近い位置との間である場合、一方の一対の検出線間には第一抵抗と第二抵抗とが並列に接続され、他方の一対の検出線間には第一抵抗が接続された状態となるので、一方の検出線間にかかる電圧と、他方の検出線間にかかる電圧とが大きく異なることとなる。 On the other hand, occur breakage in the detection line, the broken point are the two positions where the second resistor is connected, and a position close to the battery, if it is between a position close to the first resistor, the one of the pair between detection line is connected in parallel with the first resistor and the second resistor, since between the other pair of detection lines in a state in which the first resistor is connected, a voltage applied between one detection line, a voltage applied between the other of the detection line is significantly different.

ここで、各一対の前記検出線において、前記第二抵抗の抵抗値は前記第一抵抗の抵抗値よりも小さいことが好ましい。 Here, in each of the pair of the detecting line, the resistance value of the second resistor is preferably smaller than the resistance value of the first resistor.

これにより、断線時に、一方の検出線間にかかる電圧と、他方の検出線間にかかる電圧とがより大きく異なることとなる。 Thus, at the time of disconnection, the voltage applied between one of the detection line, and a voltage applied between the other detection lines become larger different.

また、第二抵抗の抵抗値が互いに同一であることが好ましい。 Further, it is preferable that the resistance value of the second resistor is the same.

これにより、検出線が断線していない状態において、各電池の消費電力がそれぞれ同一となり、電池の容量バランスが崩れ難い。 Thus, in a state where the detection line is not broken, the power consumption of each cell respectively become the same, hardly collapses capacity balance of the battery.

本発明によれば、簡易な構成でありながら断線を容易に検出できる電圧モニタ回路が提供される。 According to the present invention, a voltage monitoring circuit which can easily detect a break with a simple configuration is provided.

以下、添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。 Hereinafter, with reference to the accompanying drawings, it will be described in detail preferred embodiments of the present invention. なお、図面の説明において、同一または相当要素には同一の符号を付し、重複する説明は省略する。 Note that in the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, without redundant description.

本実施形態に係る電圧モニタ回路1は、直列に接続された電池E1,E2,E3,E4の電圧をモニタする回路である。 Voltage monitor circuit 1 according to the present embodiment is a circuit for monitoring the voltage of the battery E1, E2, E3, E4 connected in series. 電圧モニタ回路1は、主として、検出線10、第一抵抗Ra1〜Ra4、第二抵抗Rb1〜Rb4を主として備えている。 Voltage monitor circuit 1 is mainly detection line 10, a first resistor Ra1~Ra4, comprises primarily a second resistor RB1-RB4.

検出線10は、直列に接続された複数の電池E1〜E4の組電池の両端と、各電池間とにそれぞれ接続されている。 Detection line 10 are respectively connected to both ends of the battery pack of the plurality of batteries E1~E4 connected in series, in a between each cell. 電池E1、E2,E3,E4の両端に対して、それぞれ、2本の検出線10により構成される一対の検出線A1,A2,A3,A4が接続されることとなる。 Against both ends of the battery E1, E2, E3, E4, respectively, two pairs of detection line constituted by the detecting line 10 A1, A2, A3, A4 so that the are connected.

第一抵抗Ra1〜Ra4は、それぞれ、各一対の検出線A1,A2,A3,A4によって、各電池E1、E2,E3,E4に対して並列に接続されている。 First resistor Ra1~Ra4, respectively, by each pair of detection lines A1, A2, A3, A4, are connected in parallel to each battery E1, E2, E3, E4.

ここで、第一抵抗Ra1〜Ra4は、過充電・過放電検出IC40において各一対の検出線A1,A2,A3,A4のそれぞれの間の電圧を測定する電圧測定器V1〜V4の内部抵抗のことである。 Here, the first resistor Ra1~Ra4 is the internal resistance of the voltmeter V1~V4 for measuring a respective voltage between each pair of detection lines A1, A2, A3, A4 in overcharge and over-discharge detection IC40 it is. なお、過充電・過放電検出IC40は、図示は省略するが、電圧測定器V1〜V4の電圧が所定の閾値を超えた場合に、対応する電池への充電を停止させたり、所定の閾値を下回った場合に、対応する電池の放電を停止させたりする機能を有することができる。 Incidentally, overcharge, over-discharge detection IC40 is not shown, when the voltage of the voltage measuring device V1~V4 exceeds a predetermined threshold value, or to stop charging of the corresponding battery, the predetermined threshold value If it falls below, it may have a function of or stopping the discharge of the corresponding battery.

第二抵抗Rb1〜Rb4も、それぞれ、各一対の検出線A1,A2,A3,A4によって、各電池E1、E2,E3,E4に対して並列に接続されている。 Also second resistor RB1-RB4, respectively, by each pair of detection lines A1, A2, A3, A4, are connected in parallel to each battery E1, E2, E3, E4. そして、第二抵抗Rb1〜Rb4が各一対の検出線に接続される位置は、電池に近い第二抵抗と、第一抵抗Raに近い第二抵抗とが交互に存在するように設定されている。 The position of the second resistor Rb1~Rb4 is connected to each pair of detection lines, a second resistor, a second resistor close to the first resistor Ra is set to be present alternately close to the battery . すなわち、第一の抵抗Rb1、Rb3が、一対の検出線A1,A3における第一抵抗Raから遠く電池Eに近い位置に接続され、第一の抵抗Rb2、Rb4が、一対の検出線A2,A4における第一抵抗Raに近く電池Eから遠い位置に接続されている。 That is, the first resistor Rb1, Rb3 is connected to a position near the far cell E from the first resistor Ra of the pair of detection lines A1, A3, the first resistor Rb2, Rb4 is, a pair of detection lines A2, A4 It is connected to a position distant from the nearby cell E in the first resistor Ra in.

ここで、第一抵抗Ra1〜Ra4の抵抗値、第二抵抗Rb1〜Rb4の抵抗値について特に制限はないが、第二抵抗Rb1〜Rb4の抵抗値のそれぞれが、対応する第一抵抗Ra1〜Ra4の抵抗値よりも小さいことが好ましい。 Here, the resistance value of the first resistor Ra1~Ra4, there is no particular restriction as to the resistance value of the second resistor RB1-RB4, the first resistor the resistance values ​​of the second resistor RB1-RB4 is, corresponding Ra1~Ra4 it is preferable smaller than the resistance value.

具体的には、例えば、第一抵抗Ra1〜Ra4の抵抗値は例えば、10〜100MΩ、第二抵抗Rb1〜Rb4の抵抗値は例えば、0.1〜10MΩとすることが好ましい。 Specifically, for example, the resistance value of the first resistor Ra1~Ra4 for example, 10~100Emuomega, the resistance of the second resistor Rb1~Rb4 for example, it is preferable that the 0.1~10Emuomega. また、第一抵抗Ra1〜Ra4の抵抗値は互いに同じであることが好ましい。 Further, it is preferable that the resistance value of the first resistor Ra1~Ra4 are the same as each other. また、第二抵抗Rb1〜Rb4の抵抗値の値も互いに同であることが好ましい。 Further, it is preferable that the value of the resistance value of the second resistor Rb1~Rb4 also same to each other.

特に第二抵抗Rb1〜Rb4の抵抗値は第一抵抗Ra1〜Ra4の抵抗値よりも小さくすることが好ましく、これにより、正常時には、主として、第二抵抗により電池の消費電流が定まる。 In particular the resistance of the second resistor Rb1~Rb4 preferably be smaller than the resistance value of the first resistor Ra1~Ra4, by which, during normal, primarily, the current consumption of the battery is determined by the second resistor. そして、第二抵抗の抵抗値を互いに同一とすることにより、各電池から消費される電流が互いに同程度となる。 Then, by identical to one another the resistance of the second resistor, the current consumed from the battery is the same level with each other. したがって、正常動作を続けてかなりの時間が経過した場合等においても、各電池の容量のバランスが崩れにくくなり好ましい。 Accordingly, even in such a case has passed considerable time continues normal operation is preferable because the balance of the capacity of the battery is not easily broken.

以下、本実施形態にかかる電圧モニタ回路1について説明する。 The following describes a voltage monitor circuit 1 according to this embodiment. ここでは、一例として、第一抵抗Ra1〜Ra4の抵抗値がいずれも10MΩ、第二抵抗Rb1〜Rb4の抵抗値がいずれも10MΩ、E1=E2=4.2V、E3=E4=3.0Vとした場合を考える。 Here, as an example, the resistance value of the first resistor Ra1~Ra4 are all 10 M.OMEGA, the resistance value of the second resistor Rb1~Rb4 is any 10MΩ, E1 = E2 = 4.2V, and E3 = E4 = 3.0 V consider the case was.

検出線10にいずれも異常がない状態では、電圧測定器V1,V2はE1,E2の電圧である4.2Vを検出し、電圧測定器V3,V4はE3,E4の電圧である3.0Vを検出する。 In the absence of any abnormality in the detection line 10, the voltage measuring device V1, V2 detects the 4.2V which is the voltage of E1, E2, the voltmeter V3, V4 is a voltage E3, E4 3.0 V to detect.

一方、図2に示すように、電池E3と電池E4との間に接続された検出線10が切断した場合、電池E2及び電池E3の直列電圧が、第二抵抗Rb2、第一抵抗Ra2、Ra3を含む回路に流れることとなる。 On the other hand, as shown in FIG. 2, when the battery E3 and connected detection line 10 between the battery E4 is disconnected, the series voltage of the batteries E2 and battery E3, the second resistor Rb2, first resistor Ra2, Ra3 It will flow in the circuit including. したがって、電圧測定器V3,V4の電圧は、 Accordingly, the voltage of the voltage measuring device V3, V4,
V3=(E2+E3)(Ra3/(Ra3+(Ra2×Rb2)/(Ra2+Rb2))) V3 = (E2 + E3) (Ra3 / (Ra3 + (Ra2 × Rb2) / (Ra2 + Rb2)))
V2=E2+E3−V2 V2 = E2 + E3-V2
となる。 To become. そして、上述の例では、V3=6.6V、V4=0.6Vとなり、V3とV4とに極めて大きな差が生ずる。 Then, in the above example, V3 = 6.6 V, V4 = 0.6V, and the very large difference occurs in the V3 and V4. したがって、この差に基づいて、過充電・過放電検出IC40では検出線の断線の有無や位置を判断することができる。 Therefore, based on this difference, it is possible to determine the presence or absence and the position of disconnection of the overcharge, overdischarge detection IC40 in the detection line.

例えば、リチウムイオン二次電池の場合には、過充電電電圧を4.3V、過放電電圧を2.5V程度とすることが多く、この場合、断線時の電圧V3が過充電電圧を超え、及び/又は、断線時の電圧V2が過放電電圧を下回るように、第一抵抗Ra1〜Ra4の抵抗値に対して、第二抵抗Rb1〜Rb4の抵抗値を定めることが好ましく、この場合、断線が起こった場合でも、特に過充電・過放電検出IC40を改造とすることなく、過充電・過放電検出IC40が過充電又は過放電が発生したものとして、電池の充電や放電をとめることができて好ましい。 For example, in the case of a lithium ion secondary battery, 4.3 V overcharge electric voltage, often to about 2.5V overdischarge voltage, in this case, the voltage V3 at the time of disconnection exceeds the overcharge voltage, and / or, as the voltage V2 at break falls below the overdischarge voltage, with respect to the resistance value of the first resistor Ra1~Ra4, it is preferable to determine the resistance value of the second resistor RB1-RB4, in this case, disconnection even if occurs, without the particular modification overcharge, overdischarge detection IC40, as overcharge, overdischarge detection IC40 overcharge or over-discharge is generated, it is possible to stop the charging and discharging of the battery preferable.

このようにするためには、具体的には、各第一抵抗Ra1〜Ra4に対して、各第二抵抗Rb1〜Rb4の抵抗値の値を同等以下の範囲に設定することが好ましい。 To do so, specifically, for each first resistor Ra1~Ra4, it is preferably set in a range of values ​​less equivalent resistance values ​​of the second resistor RB1-RB4.

以上説明した電圧モニタ装置によれば、組み立て時の接触等による検知線の断線や、組み立て後の経年変化による検知線の断線が起きた場合にこれを容易に検知することができ、電圧モニタができなくなることによる過充電や過放電の可能性を低減できる。 According to the voltage monitor device described above, disconnection and detection line due to contact or the like at the time of assembling, which can be easily detected when the disconnection detection line due to aging after assembly has occurred, the voltage monitor it is possible to reduce the possibility of over-charging and over-discharge due to not be. また、構成が非常に簡単であり、低コスト化に資する。 Further, the configuration is very simple, contributes to cost reduction.

なお、使用される電池E1〜E4は特に限定されないが、2次電池が好ましく、特に、 Although not particularly batteries E1~E4 used limited, but is preferably a secondary battery, in particular,
電圧の管理が重要なリチウムイオン二次電池が好ましい。 Administration of the voltage is preferably important lithium ion secondary battery.

本発明は上記実施形態に限られずさまざまな変形態様が可能である。 The present invention is susceptible to various variations not limited to the above embodiment.

図1は、本発明の実施形態に係る電圧モニタ回路の回路図である。 Figure 1 is a circuit diagram of a voltage monitoring circuit according to an embodiment of the present invention. 図2は、図1の電圧モニタ回路の断線時の状態を示す回路図である。 Figure 2 is a circuit diagram showing a state when the disconnection of the voltage monitoring circuit of FIG. 図3は、従来の電圧モニタ回路の回路図である。 Figure 3 is a circuit diagram of a conventional voltage monitoring circuit.

符号の説明 DESCRIPTION OF SYMBOLS

1…電圧モニタ回路、E1〜E4…電池、10…検出線、A1〜A4…一対の検出線、Ra1〜Ra4…第一抵抗、Rb1〜Rb4…第二抵抗。 1 ... voltage monitor circuit, E1 to E4 ... battery, 10 ... detection line, Al to A4 ... a pair of detection lines, Ra1~Ra4 ... first resistor, RB1-RB4 ... second resistor.

Claims (3)

  1. 直列に接続された複数の電池の電圧をモニタする電圧モニタ回路であって、 A voltage monitor circuit for monitoring a voltage of a plurality of batteries connected in series,
    前記複数の電池の両端及び前記電池間にそれぞれ接続された検出線と、 A detecting line connected across and the battery of the plurality of batteries,
    前記各電池に対して設けられ、前記各電池の両端に接続された一対の前記検出線により前記各電池と並列に接続された第一抵抗と、 Wherein provided for each cell, said first resistor connected in parallel with each battery by a pair of the detection lines connected to both ends of each battery,
    前記各電池に対して設けられ、前記各電池の両端に接続された一対の前記検出線により前記各電池と並列に接続された第二抵抗と、を備え、 Wherein provided for each cell, and a second resistor connected in parallel with each battery by a pair of the detection line connected to both ends of each battery,
    前記各一対の前記検出線における前記第二抵抗が接続される位置は、前記第一抵抗よりも前記電池に近い位置で接続された前記第二抵抗と、前記電池よりも前記第一抵抗に近い位置で接続された前記第二抵抗とが、前記電池が並ぶ順に交互に存在するようにされている電圧モニタ回路。 The position where the second resistor of each pair of said detection wire is connected, said second resistor connected at a position close to the battery than the first resistor, close to the first resistance than the battery It said second resistor connected in position, the voltage monitor circuit is adapted to alternately present in the order in which the battery is arranged.
  2. 前記各一対の前記検出線において、前記第二抵抗の抵抗値は前記第一抵抗の抵抗値よりも小さい請求項1記載の電圧モニタ回路。 In each pair of the detection wire, the resistance value of the second resistor voltage monitoring circuit of small claim 1 than the resistance value of the first resistor.
  3. 前記第二抵抗の抵抗値が互いに同一である請求項1又は2の電圧モニタ回路。 Claim 1 or 2 of the voltage monitor circuit and the resistance value of the second resistor is the same.
JP2008183111A 2008-07-14 2008-07-14 Voltage monitor circuit Active JP4775415B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001116776A (en) * 1999-10-19 2001-04-27 Honda Motor Co Ltd Battery voltage measuring device
JP2002343445A (en) * 2001-05-17 2002-11-29 Sanyo Electric Co Ltd Voltage detecting circuit for battery pack
JP2004104989A (en) * 2002-08-23 2004-04-02 Nissan Motor Co Ltd Abnormality detection device of battery pack
JP2007010580A (en) * 2005-07-01 2007-01-18 Nissan Motor Co Ltd Cell voltage measurement device and fuel cell

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001116776A (en) * 1999-10-19 2001-04-27 Honda Motor Co Ltd Battery voltage measuring device
JP2002343445A (en) * 2001-05-17 2002-11-29 Sanyo Electric Co Ltd Voltage detecting circuit for battery pack
JP2004104989A (en) * 2002-08-23 2004-04-02 Nissan Motor Co Ltd Abnormality detection device of battery pack
JP2007010580A (en) * 2005-07-01 2007-01-18 Nissan Motor Co Ltd Cell voltage measurement device and fuel cell

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