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JP2007010316A - Flying capacitor voltage detector - Google Patents

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JP2007010316A
JP2007010316A JP2005187583A JP2005187583A JP2007010316A JP 2007010316 A JP2007010316 A JP 2007010316A JP 2005187583 A JP2005187583 A JP 2005187583A JP 2005187583 A JP2005187583 A JP 2005187583A JP 2007010316 A JP2007010316 A JP 2007010316A
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flying capacitor
voltage
battery module
circuit
battery
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Makoto Takeyama
誠 武山
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Toyota Motor Corp
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Abstract

【課題】 断線不良と組電池の発電異常とを区別して、異常判定を行うフライングキャパシタ式電圧検出装置を提案する。
【解決手段】 フライングキャパシタ式電圧検出装置（１０）は、直列接続されて組電池（４０）を構成する電池モジュールの各両端を電池モジュール毎に極性交互にチャージするフライングキャパシタ回路（２０）と、フライングキャパシタ回路（２０）の出力電圧を電池モジュールの検出電圧として記憶するメモリ（３３）と、隣接する二つの電池モジュールの検出電圧の極性が異なり且つ検出電圧の大きさが同程度であることを条件として異常判定を行う演算回路（３２）とを備える。
【選択図】 図１
PROBLEM TO BE SOLVED: To propose a flying capacitor type voltage detection device that distinguishes between a disconnection failure and a power generation abnormality of a battery pack and performs abnormality determination.
A flying capacitor type voltage detection device (10) includes a flying capacitor circuit (20) for charging each end of a battery module that is connected in series and constituting an assembled battery (40) alternately in polarity for each battery module; The memory (33) that stores the output voltage of the flying capacitor circuit (20) as the detection voltage of the battery module and the polarity of the detection voltage of two adjacent battery modules are different and the magnitude of the detection voltage is approximately the same. And an arithmetic circuit (32) that performs abnormality determination as a condition.
[Selection] Figure 1

Description

本発明は複数のセルを直列接続して成る組電池のセル電圧を検出するフライングキャパシタ式電圧検出装置に関する。   The present invention relates to a flying capacitor type voltage detecting device for detecting a cell voltage of an assembled battery formed by connecting a plurality of cells in series.

電気自動車やハイブリッド車では、走行エネルギーを蓄電する高圧大容量の二次電池が用いられている。燃料電池を発電装置として備える燃料電車両においても、燃料電池の出力変動のバッファとして、高圧大容量の二次電池が用いられている。二次電池や燃料電池は、複数のセルを直列に接続してなる組電池である。組電池の異常を検出するための手段として、例えば、特開２００３−８４０１５号公報には、フライングキャパシタ方式で組電池のセル電圧を検出し、検出したセル電圧に基づいて、組電池と電圧検出装置との間の断線不良を判定する技術が提案されている。特開２００３−２９７４０７号公報には、組電池のセル電圧を検出し、検出したセル電圧と所定の基準電圧とを比較して、個々のセルの異常を判断する技術が提案されている。
特開２００３−８４０１５号公報 特開２００３−２９７４０７号公報 In electric vehicles and hybrid vehicles, high-voltage and large-capacity secondary batteries that store running energy are used. In a fuel-powered vehicle equipped with a fuel cell as a power generator, a high-voltage and large-capacity secondary battery is used as a buffer for fluctuations in the output of the fuel cell. A secondary battery or a fuel battery is an assembled battery formed by connecting a plurality of cells in series. As a means for detecting an abnormality of an assembled battery, for example, Japanese Patent Application Laid-Open No. 2003-84015 detects a cell voltage of an assembled battery by a flying capacitor method, and detects an assembled battery and a voltage based on the detected cell voltage. A technique for determining a disconnection failure with an apparatus has been proposed. Japanese Patent Laid-Open No. 2003-297407 proposes a technique for detecting a cell voltage of an assembled battery and comparing the detected cell voltage with a predetermined reference voltage to determine an abnormality of each cell.
JP 2003-84015 A JP 2003-297407 A

しかし、燃料電池では、セル面内のフラッディング等によって生じる水素不足の状態で発電を継続すると、セル電圧はマイナス電位まで落ち込むことが知られている。セル電圧と所定の閾値とを比較して、断線不良を判定していたのでは、セル電圧の低下要因が断線不良によるものなのか、或いは発電異常によるものなのかを区別できない。   However, it is known that in a fuel cell, if power generation is continued in a state of hydrogen shortage caused by flooding in the cell surface, the cell voltage drops to a negative potential. If the disconnection failure is determined by comparing the cell voltage with a predetermined threshold, it cannot be distinguished whether the cause of the decrease in the cell voltage is due to the disconnection failure or the power generation abnormality.

そこで、本発明は、断線不良と組電池の発電異常とを区別して、異常判定を行うフライングキャパシタ式電圧検出装置を提案することを課題とする。   Then, this invention makes it a subject to propose the flying capacitor type voltage detection apparatus which distinguishes a disconnection defect and the power generation abnormality of an assembled battery, and performs abnormality determination.

上記の課題を解決するため、本発明のフライングキャパシタ式電圧検出装置は、直列接続されて組電池を構成する電池モジュールの各両端を電池モジュール毎に極性交互にチャージするフライングキャパシタ回路と、フライングキャパシタ回路の出力電圧を電池モジュールの検出電圧として記憶する記憶手段と、隣接する二つの電池モジュールの検出電圧の極性が異なり且つ検出電圧の大きさが同程度であることを条件として異常判定を行う判定手段とを備える。かかる構成により、断線不良と組電池の発電異常とを区別して、異常判定を行うことができる。尚、電池モジュールとは、単一又は複数のセルから成るモジュールである。   In order to solve the above-described problems, a flying capacitor type voltage detection device of the present invention includes a flying capacitor circuit in which each end of a battery module that is connected in series and constitutes an assembled battery is alternately charged for each battery module, and a flying capacitor Judgment that performs abnormality determination on condition that the polarity of the detection voltage of two adjacent battery modules is different and the magnitude of the detection voltage is approximately the same as the storage means that stores the output voltage of the circuit as the detection voltage of the battery module Means. With such a configuration, it is possible to make an abnormality determination by distinguishing between a disconnection failure and a power generation abnormality of the assembled battery. The battery module is a module composed of a single cell or a plurality of cells.

ここで、判定手段は、上述の条件が一定時間継続して成立している場合に異常判定を行うのが好ましい。例えば、水素不足が原因でセル電圧が低下した場合、一時的には、上述の条件が成立する場合も想定されるが、セル電圧が負電圧領域で一定電圧を維持することはない。水素不足で発電を継続すれば、セル電圧は低下し続け、発電を停止すれば、セル電圧は上昇することが知られている。そこで、上述の条件が一定時間（例えば、数秒）継続している場合に、異常判定を行うのが好ましい。   Here, it is preferable that the determination unit performs the abnormality determination when the above-described condition is continuously established for a certain time. For example, when the cell voltage decreases due to hydrogen shortage, the above condition may be temporarily satisfied, but the cell voltage does not maintain a constant voltage in the negative voltage region. It is known that if power generation is continued due to hydrogen shortage, the cell voltage continues to decrease, and if power generation is stopped, the cell voltage increases. Therefore, it is preferable to perform the abnormality determination when the above-described condition continues for a certain time (for example, several seconds).

また、本発明のフライングキャパシタ式電圧検出装置において、上述の構成に加えて、フライングキャパシタ回路の出力電圧を差動増幅する差動増幅回路を更に備え、記憶手段は差動増幅回路の出力電圧値を電池モジュールの検出電圧として記憶するように構成してもよい。また、フライングキャパシタ回路は、フライングキャパシタと、電池モジュールの各両端を電池モジュール毎にフライングキャパシタの両端に順次接続して電池モジュールの電圧によりフライングキャパシタを極性交互にチャージする入力側サンプリング手段と、差動増幅回路の一対の入力端子をフライングキャパシタの両端に接続する出力側サンプリング手段を備えてもよい。   In addition to the above-described configuration, the flying capacitor type voltage detection device of the present invention further includes a differential amplifier circuit that differentially amplifies the output voltage of the flying capacitor circuit, and the storage means outputs an output voltage value of the differential amplifier circuit. May be stored as the detected voltage of the battery module. The flying capacitor circuit includes a difference between the flying capacitor and the input side sampling means for connecting each end of the battery module to the both ends of the flying capacitor for each battery module and charging the flying capacitor alternately with the voltage of the battery module. You may provide the output side sampling means which connects a pair of input terminal of a dynamic amplifier circuit to the both ends of a flying capacitor.

本発明によれば、断線不良と組電池の発電異常とを区別して、異常判定を行うことができる。   According to the present invention, it is possible to determine abnormality by distinguishing between disconnection failure and power generation abnormality of the assembled battery.

以下、各図を参照して本発明の実施形態について説明する。
図１は本実施形に係るフライングキャパシタ式電圧検出装置１０の回路構成を示している。フライングキャパシタ式電圧検出装置１０は、フライングキャパシタ方式により組電池４０のセル電圧を検出するための装置であり、主に、フライングキャパシタ回路２０、差動増幅回路Ａｍｐ、及びコントローラ３０を備えて構成されている。組電池４０は複数のセルを直列接続して成る燃料電池スタック又は二次電池である。フライングキャパシタ式電圧検出装置１０は単一又は複数のセルから成る電池モジュール毎にセル電圧の検出を行う。本実施形態では、説明の便宜上、単一のセル毎にセル電圧の検出を行う方式を示すが、複数のセルから成る電池モジュール毎にセル電圧の検出を行う方式にも適用できる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a circuit configuration of a flying capacitor type voltage detection apparatus 10 according to the present embodiment. The flying capacitor type voltage detection device 10 is a device for detecting a cell voltage of the assembled battery 40 by a flying capacitor method, and mainly includes a flying capacitor circuit 20, a differential amplifier circuit Amp, and a controller 30. ing. The assembled battery 40 is a fuel cell stack or a secondary battery formed by connecting a plurality of cells in series. The flying capacitor type voltage detection device 10 detects a cell voltage for each battery module including a single cell or a plurality of cells. In the present embodiment, for convenience of explanation, a method for detecting the cell voltage for each single cell is shown. However, the present embodiment can also be applied to a method for detecting the cell voltage for each battery module including a plurality of cells.

フライングキャパシタ回路２０は、フライングキャパシタＣと、電池モジュールの各両端を電池モジュール毎にフライングキャパシタＣの両端に順次接続して電池モジュールの電圧によりフライングキャパシタＣを極性交互にチャージする入力側サンプリングスイッチＳＷ１１〜ＳＷ１６と、差動増幅回路Ａｍｐの一対の入力端子をフライングキャパシタＣの両端に接続する出力側サンプリングスイッチＳＷ２１〜ＳＷ２２とを備える。   The flying capacitor circuit 20 is connected to the flying capacitor C and both ends of the battery module sequentially to both ends of the flying capacitor C for each battery module, and the input side sampling switch SW11 charges the flying capacitor C alternately with the voltage of the battery module. To SW16 and output side sampling switches SW21 to SW22 for connecting a pair of input terminals of the differential amplifier circuit Amp to both ends of the flying capacitor C.

コントローラ３０は、差動増幅回路Ａｍｐの出力電圧をＡ／Ｄ変換するＡ／Ｄ変換器３１と、差動増幅回路Ａｍｐの出力電圧値を電池モジュールの検出電圧として記憶するメモリ３３と、電池モジュールの検出電圧に基づいて異常判定を行う判定手段として機能する演算回路３２とを備える。演算回路３２は、隣接する二つの電池モジュールの検出電圧の極性が異なり且つ検出電圧の大きさが同程度である場合に異常判定を行う。演算回路３２は、上位コントローラに検出電圧を出力する他、異常判定の際には、上位コントローラに異常を通知することによって、システム停止や警報などの措置を講じる。   The controller 30 includes an A / D converter 31 that performs A / D conversion on the output voltage of the differential amplifier circuit Amp, a memory 33 that stores an output voltage value of the differential amplifier circuit Amp as a detection voltage of the battery module, and a battery module. And an arithmetic circuit 32 functioning as a determination means for determining abnormality based on the detected voltage. The arithmetic circuit 32 performs abnormality determination when the polarities of the detection voltages of the two adjacent battery modules are different and the magnitudes of the detection voltages are approximately the same. In addition to outputting the detection voltage to the host controller, the arithmetic circuit 32 notifies the host controller of the abnormality and takes measures such as system stop and alarm when determining the abnormality.

さて、上述の構成において、例えば、セル電圧Ｖ１を検出するには、入力側サンプリングスイッチＳＷ１１，ＳＷ１２を閉じて、実線の向きにフライングキャパシタＣをチャージし、セル電圧Ｖ１をフライングキャパシタＣにサンプリングホールドする。次いで、入力側サンプリングスイッチＳＷ１１，ＳＷ１２を開き、出力側サンプリングスイッチＳＷ２１，ＳＷ２２を閉じて、フライングキャパシタＣの両端を差動増幅回路Ａｍｐに接続する。すると、フライングキャパシタＣの両端の電位差が差増増幅されたアナログ電圧値が出力される。コントローラ３０は、このアナログ電圧値をＡ／Ｄ変換し、Ａ／Ｄ変換後のデジタル電圧値をセル電圧Ｖ１の検出電圧値として記憶する。   In the above configuration, for example, in order to detect the cell voltage V1, the input side sampling switches SW11 and SW12 are closed, the flying capacitor C is charged in the direction of the solid line, and the cell voltage V1 is sampled and held in the flying capacitor C. To do. Next, the input side sampling switches SW11 and SW12 are opened, the output side sampling switches SW21 and SW22 are closed, and both ends of the flying capacitor C are connected to the differential amplifier circuit Amp. Then, an analog voltage value obtained by differentially amplifying the potential difference between both ends of the flying capacitor C is output. The controller 30 performs A / D conversion on the analog voltage value, and stores the digital voltage value after the A / D conversion as a detection voltage value of the cell voltage V1.

次いで、セル電圧Ｖ２を検出するには、入力側サンプリングスイッチＳＷ１２，ＳＷ１３を閉じて、点線の向きにフライングキャパシタＣをチャージし、セル電圧Ｖ２をフライングキャパシタＣにサンプリングホールドする。次いで、入力側サンプリングスイッチＳＷ１２，ＳＷ１３を開き、出力側サンプリングスイッチＳＷ２１，ＳＷ２２を閉じて、フライングキャパシタＣの両端を差動増幅回路Ａｍｐに接続する。すると、フライングキャパシタＣの両端の電位差が差増増幅されたアナログ電圧値が出力される。コントローラ３０は、このアナログ電圧値をＡ／Ｄ変換し、Ａ／Ｄ変換後のデジタル電圧値をセル電圧Ｖ２の検出電圧値として記憶する。   Next, in order to detect the cell voltage V2, the input side sampling switches SW12 and SW13 are closed, the flying capacitor C is charged in the direction of the dotted line, and the cell voltage V2 is sampled and held in the flying capacitor C. Next, the input side sampling switches SW12 and SW13 are opened, the output side sampling switches SW21 and SW22 are closed, and both ends of the flying capacitor C are connected to the differential amplifier circuit Amp. Then, an analog voltage value obtained by differentially amplifying the potential difference between both ends of the flying capacitor C is output. The controller 30 performs A / D conversion on the analog voltage value, and stores the digital voltage value after the A / D conversion as a detection voltage value of the cell voltage V2.

このように、隣接するセル（又は電池モジュール）の出力電圧は、極性が交互に反転する向きにフライングキャパシタＣにチャージされる。即ち、奇数番目のセル（又は電池モジュール）の出力電圧を正電圧とすると、偶数番目のセル（又は電池モジュール）の出力電圧は負電圧として検出される。   As described above, the output voltage of the adjacent cell (or battery module) is charged to the flying capacitor C in such a direction that the polarities are alternately reversed. That is, if the output voltage of the odd-numbered cell (or battery module) is a positive voltage, the output voltage of the even-numbered cell (or battery module) is detected as a negative voltage.

次に、図２を参照しながら本発明の原理について説明を加える。例えば、同図においてＶＢＢ３が断線した場合を考察する。この場合、入力側サンプリングスイッチＳＷ１１，ＳＷ１２を閉じることにより、セル電圧Ｖ１は、フライングキャパシタＣにチャージされるが、入力側サンプリングスイッチＳＷ１２，ＳＷ１３を閉じても、セル電圧Ｖ２は、フライングキャパシタＣにチャージされることはないので、セル電圧Ｖ１の電荷がそのまま残留する。すると、セル電圧Ｖ２の検出電圧は、セル電圧Ｖ１の検出電圧の極性を反転した電圧値として検出される。   Next, the principle of the present invention will be described with reference to FIG. For example, consider the case where VBB 3 is disconnected in FIG. In this case, the cell voltage V1 is charged to the flying capacitor C by closing the input side sampling switches SW11 and SW12. However, even if the input side sampling switches SW12 and SW13 are closed, the cell voltage V2 is applied to the flying capacitor C. Since it is not charged, the charge of the cell voltage V1 remains as it is. Then, the detection voltage of the cell voltage V2 is detected as a voltage value obtained by inverting the polarity of the detection voltage of the cell voltage V1.

そこで、演算回路３２は、Ｖn＝−Ｖn-1±５０ｍＶの条件が成立した場合に、フライングキャパシタ回路２０と各セル（又は各電池モジュール）を結線する配線に断線が生じたものと判定する。ここで、Ｖnはｎ番目のセル（又は各電池モジュール）の検出電圧であり、Ｖn-1は（ｎ−１）番目のセル（又は各電池モジュール）の検出電圧である。また、±５０ｍＶは、検出電圧のばらつきを加味した補正値である。補正値として、如何なる値を採用するかは、フライングキャパシタ式電圧検出装置１０の検出精度によるので、上述の値に限定されるものはない。 Therefore, the arithmetic circuit 32 determines that a disconnection has occurred in the wiring connecting the flying capacitor circuit 20 and each cell (or each battery module) when the condition of V n = −V n−1 ± 50 mV is satisfied. To do. Here, V n is a detection voltage of the n-th cell (or battery modules), V n-1 is the detection voltage of the (n-1) th cell (or each battery module). ± 50 mV is a correction value that takes into account variations in the detection voltage. The value to be used as the correction value depends on the detection accuracy of the flying capacitor type voltage detection device 10 and is not limited to the above value.

尚、水素不足が原因でセル電圧が低下した場合、一時的には、Ｖn＝−Ｖn-1となる場合も想定されるが、セル電圧が負電圧領域で一定電圧を維持することはない。水素不足で発電を継続すれば、セル電圧は低下し続け、発電を停止すれば、セル電圧は上昇することが知られている。そこで、Ｖn＝−Ｖn-1±５０ｍＶの関係が一定時間（例えば、数秒）継続している場合に、断線が生じているものと判定するのが好ましい。 If the cell voltage drops due to hydrogen shortage, it may be temporarily assumed that V n = −V n−1 , but the cell voltage maintains a constant voltage in the negative voltage region. Absent. It is known that if power generation is continued due to hydrogen shortage, the cell voltage continues to decrease, and if power generation is stopped, the cell voltage increases. Therefore, it is preferable to determine that a disconnection has occurred when the relationship of V n = −V n−1 ± 50 mV continues for a certain time (for example, several seconds).

図３は、断線箇所（オープン部位）ＶＢＢ１〜ＶＢＢ６と、各セル電圧Ｖ１〜Ｖ５の検出値との対応関係を示している。この例では、実際の各セル電圧Ｖ１〜Ｖ５を１Ｖと仮定している。例えば、ＶＢＢ３が断線すると、セル電圧Ｖ２は、セル電圧Ｖ１の極性を判定した値、即ち、−１Ｖとして検出される。   FIG. 3 shows a correspondence relationship between the disconnection locations (open locations) VBB1 to VBB6 and the detected values of the cell voltages V1 to V5. In this example, the actual cell voltages V1 to V5 are assumed to be 1V. For example, when VBB3 is disconnected, the cell voltage V2 is detected as a value that determines the polarity of the cell voltage V1, that is, −1V.

本実施形態によれば、断線不良と組電池４０の発電異常とを区別して異常判定を行うことができる。   According to the present embodiment, the abnormality determination can be performed by distinguishing the disconnection failure from the power generation abnormality of the assembled battery 40.

本実施形に係る組電池の電圧検出装置の回路構成図である。It is a circuit block diagram of the voltage detection apparatus of the assembled battery which concerns on this embodiment. 本発明の原理を示す説明図である。It is explanatory drawing which shows the principle of this invention. セル電圧の検出例を示す説明図である。It is explanatory drawing which shows the detection example of a cell voltage.

符号の説明Explanation of symbols

１０…電圧検出装置 ２０…フライングキャパシタ回路 ３０…コントローラ ３１…Ａ／Ｄ変換器 ３２…演算回路 ３３…メモリ ４０…組電池 ＳＷ１１〜ＳＷ１６…入力側サンプリングスイッチ ＳＷ２１〜ＳＷ２２…出力側サンプリングスイッチ Ｃ…フライングキャパシタ Ａｍｐ…差動増幅回路

DESCRIPTION OF SYMBOLS 10 ... Voltage detection apparatus 20 ... Flying capacitor circuit 30 ... Controller 31 ... A / D converter 32 ... Arithmetic circuit 33 ... Memory 40 ... Battery assembly SW11-SW16 ... Input side sampling switch SW21-SW22 ... Output side sampling switch C ... Flying Capacitor Amp ... Differential amplifier circuit

Claims (4)

直列接続されて組電池を構成する電池モジュールの各両端を前記電池モジュール毎に極性交互にチャージするフライングキャパシタ回路と、前記フライングキャパシタ回路の出力電圧を前記電池モジュールの検出電圧として記憶する記憶手段と、隣接する二つの電池モジュールの検出電圧の極性が異なり且つ検出電圧の大きさが同程度であることを条件として異常判定を行う判定手段とを備える、フライングキャパシタ式電圧検出装置。   A flying capacitor circuit that alternately charges each end of each battery module that is connected in series to form a battery pack, and a storage unit that stores an output voltage of the flying capacitor circuit as a detection voltage of the battery module; A flying capacitor type voltage detection device comprising: determination means for performing abnormality determination on condition that the polarities of detection voltages of two adjacent battery modules are different and the magnitudes of the detection voltages are approximately the same. 請求項１に記載のフライングキャパシタ式電圧検出装置であって、前記判定手段は、前記条件が一定時間継続して成立している場合に異常判定を行う、フライングキャパシタ式電圧検出装置。   The flying capacitor type voltage detection device according to claim 1, wherein the determination unit performs an abnormality determination when the condition is continuously established for a predetermined time. 請求項１又は請求項２に記載のフライングキャパシタ式電圧検出装置であって、前記フライングキャパシタ回路の出力電圧を差動増幅する差動増幅回路を更に備え、前記記憶手段は前記差動増幅回路の出力電圧値を前記電池モジュールの検出電圧として記憶する、フライングキャパシタ式電圧検出装置。   3. The flying capacitor type voltage detection device according to claim 1, further comprising a differential amplifier circuit that differentially amplifies the output voltage of the flying capacitor circuit, wherein the storage means is provided in the differential amplifier circuit. A flying capacitor type voltage detection device that stores an output voltage value as a detection voltage of the battery module. 請求項３に記載のフライングキャパシタ式電圧検出装置であって、前記フライングキャパシタ回路は、フライングキャパシタと、前記電池モジュールの各両端を前記電池モジュール毎に前記フライングキャパシタの両端に順次接続して前記電池モジュールの電圧により前記フライングキャパシタを極性交互にチャージする入力側サンプリング手段と、前記差動増幅回路の一対の入力端子を前記フライングキャパシタの両端に接続する出力側サンプリング手段を備える、フライングキャパシタ式電圧検出装置。

4. The flying capacitor type voltage detection device according to claim 3, wherein the flying capacitor circuit is configured such that each end of the flying capacitor and the battery module are sequentially connected to both ends of the flying capacitor for each battery module. Flying-capacitor-type voltage detection, comprising: input-side sampling means for charging the flying capacitor alternately with the voltage of the module; and output-side sampling means for connecting a pair of input terminals of the differential amplifier circuit to both ends of the flying capacitor. apparatus.

JP2005187583A 2005-06-28 2005-06-28 Flying capacitor voltage detector Pending JP2007010316A (en)

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