JP5001120B2 - Charge / discharge test equipment - Google Patents

Charge / discharge test equipment Download PDF

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JP5001120B2
JP5001120B2 JP2007305445A JP2007305445A JP5001120B2 JP 5001120 B2 JP5001120 B2 JP 5001120B2 JP 2007305445 A JP2007305445 A JP 2007305445A JP 2007305445 A JP2007305445 A JP 2007305445A JP 5001120 B2 JP5001120 B2 JP 5001120B2
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JP2009128274A (en
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則之 伊藤
文明 伊原
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Fujitsu Telecom Networks Ltd
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Description

本発明は、コンデンサやバッテリーを被試験試料として、直流電流にリップル電流を重畳して充放電試験を行う充放電試験装置に関する。   The present invention relates to a charge / discharge test apparatus that performs a charge / discharge test by superimposing a ripple current on a direct current using a capacitor or a battery as a test sample.

コンデンサやバッテリーを被試験試料として、直流定電流で充電と放電とを繰り返すことにより試験を行う充放電試験装置で、各種の使用条件に即した試験及び加速試験の必要性から、直流定電流に対して、数Ｈｚ〜数１０ｋＨｚの周波数のリップル電流を重畳して充放電試験を行う充放電試験装置が知られている。例えば、図３に示すように、充放電試験装置１１の充放電回路１３から被試験試料としてバッテリー（ＢＡＴＴ）１２に対して定電流で充放電を行い、リップル重畳回路１４からのリップル電流を被試験試料のバッテリー１２に供給するもので、リップル重畳回路１４は、電子負荷回路１５と、リップル電流の周波数の交流信号を電子負荷回路１５に入力する交流信号発生部１６と、バイアス電源１７とを含む構成を備えている。   This is a charge / discharge tester that performs tests by repeatedly charging and discharging with a constant DC current using a capacitor or battery as a sample to be tested. On the other hand, a charge / discharge test apparatus that performs a charge / discharge test by superimposing a ripple current having a frequency of several Hz to several tens of kHz is known. For example, as shown in FIG. 3, the battery (BATT) 12 is charged and discharged from the charge / discharge circuit 13 of the charge / discharge test apparatus 11 as a sample to be tested with a constant current, and the ripple current from the ripple superimposing circuit 14 is measured. The ripple superimposing circuit 14 is supplied to the test sample battery 12. The ripple superimposing circuit 14 includes an electronic load circuit 15, an AC signal generating unit 16 for inputting an AC signal having a ripple current frequency to the electronic load circuit 15, and a bias power source 17. It has a configuration that includes.

リップル重畳回路１４の電子負荷回路１５は、例えば、図４に示す構成とすることができる。即ち、制御回路２１と、オペアンプ（演算増幅器）２２と、バイアス電源２３と、トランジスタＱ１と、抵抗Ｒ１，Ｒ２とを含む構成を有するもので、バイアス電源２３は、図３に於けるバイアス電源１７と同一の作用を行うものである。従って、図３に於ける電子負荷回路１５を、図４に示す構成とした場合、図３に於けるバイアス電源１７と図４に於けるバイアス電源２３とは同一の作用を行うことになるから、その何れか一方を省略することができる。或は、図３に於けるバイアス電源１７及び図４に於けるバイアス電源２３を何れも省略した構成を適用することもできる。又図４に於ける制御回路２１は、交流信号発生部１６からの交流信号に対応した周期で且つ所定のレベルとなる信号をオペアンプ（演算増幅器）２２の一方の入力とし、他方の入力は、トランジスタＱ１を介して流れる電流に対応した抵抗Ｒ１の両端の電圧ＶＲとする。それにより、バッテリー１２の放電電流を、交流信号発生部１６からの交流信号の周波数で、制御回路２１に設定した最大値に対応して、０〜最大値の電流をバッテリー１２から電子負荷回路１５に流すことができる。 For example, the electronic load circuit 15 of the ripple superimposing circuit 14 can be configured as shown in FIG. That is, it has a configuration including a control circuit 21, an operational amplifier (operational amplifier) 22, a bias power source 23, a transistor Q1, and resistors R1 and R2. The bias power source 23 is the bias power source 17 in FIG. Performs the same action . Therefore, when the electronic load circuit 15 in FIG. 3 is configured as shown in FIG. 4, the bias power source 17 in FIG. 3 and the bias power source 23 in FIG. 4 perform the same operation. , it is possible to omit the one that either. Alternatively , a configuration in which both the bias power supply 17 in FIG. 3 and the bias power supply 23 in FIG. 4 are omitted can be applied . Also in the control circuit 21 in FIG. 4, a signal and a predetermined level in a cycle corresponding to an AC signal from the AC signal generator 16 to one input of an operational amplifier (operational amplifier) 22, the other input, the voltage V R across the resistor R 1 corresponding to the current flowing through the transistor Q1. As a result, the discharge current of the battery 12 corresponds to the maximum value set in the control circuit 21 at the frequency of the AC signal from the AC signal generator 16, and the current of 0 to the maximum value is transferred from the battery 12 to the electronic load circuit 15. Can be shed.

又図３に於いて、充放電回路１３からバッテリー１２を充電している場合、電子負荷回路１４には、交流信号発生部１６からの交流信号に従った電流が、バッテリー１２に対してはバイパスされることになり、従って、バッテリー１２に対しては、交流信号の周波数に従った放電が繰り返し行われることになり、直流の充放電電流に対して、交流信号発生部１６からの交流信号の周波数に従ったリップル電流が重畳されることになる。そして、被試験試料のバッテリー１２の端子電圧を、図示を省略した電圧測定部により測定し、流れる電流を、図示を省略した電流測定部により測定し、リップル電流に対応したピーク・トー・ピークの電圧及び電流を基に、被試験試料のバッテリー１２のインピーダンスを求め、予め求めておいた寿命等との関連情報を基に、被試験試料のバッテリー１２の劣化状況及び寿命判定も可能となる。   In FIG. 3, when the battery 12 is charged from the charging / discharging circuit 13, a current according to the AC signal from the AC signal generating unit 16 is bypassed to the battery 12 in the electronic load circuit 14. Therefore, the battery 12 is repeatedly discharged in accordance with the frequency of the AC signal, and the AC signal from the AC signal generator 16 is applied to the DC charge / discharge current. The ripple current according to the frequency is superimposed. Then, the terminal voltage of the battery 12 to be tested is measured by a voltage measuring unit (not shown), the flowing current is measured by a current measuring unit (not shown), and the peak-to-peak corresponding to the ripple current is measured. Based on the voltage and current, the impedance of the battery 12 of the sample to be tested is obtained, and the deterioration status and life of the battery 12 of the sample to be tested can be determined based on the information related to the life and the like obtained in advance.

又定電流充電回路と定電流放電回路とに、それぞれ交流信号を入力する構成とし、被試験試料のバッテリーに対して、交流信号の周期で充放電を行う構成が提案されている（例えば、特許文献１参照）。又複数周波数の交流信号に従った電流を、ハイパスフィルタを介して被試験試料のバッテリーに入力し、そのバッテリーの端子電圧を、ハイパスフィルタを介して検出し、バッテリーの内部インピーダンス測定を行って、バッテリーの寿命判定を行う手段も提案されている（例えば、特許文献２参照）。又直流の充放電回路と、１００Ｈｚ〜２００ｋＨｚの交流電圧の出力部とにより、被試験試料のバッテリーの充放電試験を行う構成も提案されている（例えば、特許文献３参照）。
特開平７−１２８４１８号公報 特開平８−２７３７０５号公報 特開２００６−２５８４２４号公報 In addition, a configuration has been proposed in which an AC signal is input to each of the constant current charging circuit and the constant current discharging circuit, and the battery of the sample to be tested is charged and discharged at the cycle of the AC signal (for example, a patent). Reference 1). Also, the current according to the AC signal of multiple frequencies is input to the battery of the sample to be tested through the high pass filter, the terminal voltage of the battery is detected through the high pass filter, and the internal impedance of the battery is measured. Means for determining battery life have also been proposed (see, for example, Patent Document 2). There has also been proposed a configuration in which a charge / discharge test of a battery to be tested is performed by a DC charge / discharge circuit and an output portion of an AC voltage of 100 Hz to 200 kHz (for example, see Patent Document 3).
JP-A-7-128418 JP-A-8-273705 JP 2006-258424 A

従来の例えば図３に示す充放電装置に於いて、電子負荷回路１５は、被試験資料のバッテリー１２に対しては、電流を減少させる方向の制御を行うものであり、図５の（Ａ）に示すように、交流信号発生部１７からの交流信号に従った周期で、最小の０Ａから最大の電流までのリップル電流Ｉｐ−ｐが流れるように制御することになる。それにより、被試験試料のバッテリー１２には、図５の（Ｂ）に示すように、最大電流Ｉ０のリップル電流Ｉｐ−ｐが流れることになる。しかし、被試験試料のバッテリー１２に対してのリップル電流は、直流充電による充電電力量又は直流放電による放電電力量の増加や減少が生じないようにすることが必要である。その為、図３に示す充放電装置の充放電回路１３にオフセットを入力し、例えば、図５の（Ｃ）に示すように、Ｉ０＋１／２・Ｉｐ−ｐ＝Ｉ０’としてリップル電流による充電電力量又は放電電力量の変化が生じないように制御する。しかし、オフセット調整が正確でないと、リップル電流による充電電力量又は放電電力量の変化が発生することになる。例えば、図５の（Ｄ）に示すように、最大電流Ｉ０’が（１／２・Ｉｐ−ｐ）以下の値となった場合、（１／２・Ｉｐ−ｐ）−Ｉ０’＝Ｉａの電流による放電が継続することになる。反対に、Ｉ０’＞（１／２・Ｉｐ−ｐ）の関係の場合は、Ｉａの電流による充電が継続することになる。従って、充放電回路１３のオフセット調整は簡単ではない問題がある。 In the conventional charging / discharging device shown in FIG. 3, for example, the electronic load circuit 15 controls the battery 12 as the material to be tested in the direction in which the current is reduced, as shown in FIG. As shown, the ripple current I pp from the minimum 0 A to the maximum current is controlled to flow in a cycle according to the AC signal from the AC signal generator 17. As a result, as shown in FIG. 5B, a ripple current I p-p having a maximum current I 0 flows through the battery 12 of the sample to be tested. However, it is necessary for the ripple current to the battery 12 of the sample to be tested not to increase or decrease the charging power amount due to DC charging or the discharging power amount due to DC discharge. Therefore, an offset is input to the charging / discharging circuit 13 of the charging / discharging device shown in FIG. 3, and for example, as shown in FIG. 5C, the ripple is set as I 0 + 1/2 · I pp = I 0 ′. Control is performed so that the amount of charging power or discharging power due to current does not change. However, if the offset adjustment is not accurate, a change in charge energy or discharge energy due to ripple current occurs. For example, as shown in (D) in FIG. 5, when the maximum current I 0 'is equal to or less than the value (1/2 · I p-p) , (1/2 · I p-p) -I 0 Discharging due to the current of '= Ia continues. On the contrary, in the case of the relationship of I 0 ′> (1/2 · I p−p ), charging by the current of Ia is continued. Therefore, there is a problem that the offset adjustment of the charge / discharge circuit 13 is not easy.

又前述の特許文献１に示す従来例の構成に於いては、定電流充電回路と定電流放電回路とを別個に設けるものであるから、充放電試験装置の構成が複雑となると共にコストアップとなる問題がある。又前述の特許文献２に示す従来例の構成に於いては、交流複合波信号をコンデンサを介して被試験試料のバッテリーに供給してインピーダンス測定を行うものであり、直流による充電及び放電の試験を含まない構成を示し、又前述の特許文献３に示す従来例の構成に於いては、バッテリーのインピーダンス測定を目的としたもので、直流による充電又は放電の試験については明記されていない。   Further, in the configuration of the conventional example shown in Patent Document 1 described above, the constant current charging circuit and the constant current discharging circuit are provided separately, so that the configuration of the charge / discharge test apparatus becomes complicated and the cost increases. There is a problem. Further, in the configuration of the conventional example shown in the above-mentioned Patent Document 2, an AC composite wave signal is supplied to a battery of a sample to be tested through a capacitor to measure impedance, and a DC charge and discharge test is performed. In the configuration of the conventional example shown in Patent Document 3 described above, the purpose is to measure the impedance of the battery, and the DC charging or discharging test is not specified.

本発明は、前述の従来例の問題点を解決するもので、比較的簡単な構成により、被試験試料に対する直流の充電及び放電の試験時に、直流成分に影響しないように、バランスのとれたリップル電流を供給可能とすることを目的とする。   The present invention solves the above-mentioned problems of the conventional example, and with a relatively simple configuration, balanced ripples are provided so as not to affect the DC component during the DC charge and discharge tests on the sample to be tested. The purpose is to make it possible to supply current.

本発明の充放電試験装置は、コンデンサ又はバッテリーを被試験試料とし、該被試験試料にリップル電流を重畳した充放電電流を供給する充放電試験装置であって、前記被試験試料に対する直流の充電又は放電を行う充放電回路と、該充放電回路と並列に接続して前記リップル電流を重畳して前記被試験試料に供給するリップル重畳回路とを含む構成を有し、前記リップル重畳回路は、前記リップル電流の周期に従って内部インピーダンスを制御する電子負荷回路と、該電子負荷回路に直接又は直流の電源を介して接続したコイルと、該コイルと両端の前記リップル電流の周期に従った電圧を前記被試験試料に印加するように、該コイルの一端と前記被試験試料の一端と間を接続したコンデンサとを含む構成を備えている。 The charge / discharge test apparatus of the present invention is a charge / discharge test apparatus that uses a capacitor or battery as a sample to be tested, and supplies a charge / discharge current in which a ripple current is superimposed on the sample to be tested. or a charge-discharge circuit to discharge, and connected in parallel with said charging and discharging circuit by superimposing the ripple current has the including configuration and ripple superimposition circuit supplies said under test sample, the ripple superimposition circuit An electronic load circuit for controlling the internal impedance according to the period of the ripple current, a coil connected to the electronic load circuit directly or via a DC power source, and a voltage according to the period of the ripple current at both ends of the coil. A configuration is provided that includes a capacitor connected between one end of the coil and one end of the test sample so as to be applied to the test sample .

又リップル重畳回路のコンデンサを、単一又は複数並列接続の電解コンデンサにより構成し、比較的低い周期のリップル電流をローコストで重畳可能とする。   Further, the capacitor of the ripple superimposing circuit is constituted by a single or a plurality of parallel-connected electrolytic capacitors, so that a ripple current having a relatively low period can be superimposed at a low cost.

電子負荷回路は、リップル電流の周期に従って内部インピーダンスを制御し、リップル電流の直流分をコイルに流し、交流分をコンデンサを介して流すことにより、被試験試料に対する充放電回路による充電又は放電を行う場合に、正負のバランスがとれたリップル電流を流すことが可能となり、オフセット調整等を行うことなく、被試験試料に対する充電又は放電の試験を行う場合のリップル電流を重畳して試験を行うことができる。   The electronic load circuit controls the internal impedance according to the period of the ripple current, flows the DC component of the ripple current through the coil, and flows the AC component through the capacitor, thereby charging or discharging the sample to be tested by the charge / discharge circuit. In this case, it is possible to flow a ripple current with a balance between positive and negative, and the test can be performed by superimposing the ripple current when performing a charge or discharge test on the sample under test without adjusting the offset. it can.

本発明の充放電試験装置は、図１を参照して説明すると、充放電回路３から被試験試料のコンデンサ又はバッテリーに対する直流の充放電電流に、リップル電流を重畳して供給する充放電試験装置１であって、被試験試料２に対する直流の充電又は放電を行う充放電回路３と、リップル重畳回路４とを含み、リップル重畳回路４は、交流信号発生部６からのリップル電流の周期の交流信号に従って内部インピーダンスを制御する電子負荷回路５と、この電子負荷回路５に直接又は電源７を介して並列に接続したコイル８と、電子負荷回路５に直接又は直流の電源７を介して直列に接続したコンデンサ９とを含む構成を備えている。   The charge / discharge test apparatus according to the present invention will be described with reference to FIG. 1. A charge / discharge test apparatus for supplying a ripple current superimposed on a DC charge / discharge current from a charge / discharge circuit 3 to a capacitor or battery of a sample to be tested. 1 and includes a charge / discharge circuit 3 that charges or discharges a direct current with respect to the sample 2 to be tested, and a ripple superimposing circuit 4. The ripple superimposing circuit 4 is an alternating current with a period of a ripple current from the alternating current signal generating unit 6. An electronic load circuit 5 that controls internal impedance in accordance with a signal, a coil 8 that is connected to the electronic load circuit 5 directly or in parallel via a power supply 7, and a serial connection to the electronic load circuit 5 directly or via a DC power supply 7 A configuration including a connected capacitor 9 is provided.

図１は、本発明の実施例１の説明図であり、１は充放電試験装置、２は被試験試料のバッテリーＢＡＴＴ、３は充放電回路、４はリップル重畳回路、５は電子負荷回路、６は交流信号発生部、７は直流の電源、８はコイル、９はコンデンサを示す。コンデンサ９は、ＤＣカット用のコンデンサであり、交流信号発生部６は、通常１００Ｈｚ〜１０ｋＨｚ程度の周波数とするものであるが、被試験試料の特性測定の為に、例えば、０．１Ｈｚ程度の低周波数とすることも可能である。又コンデンサ９は、比較的大きなリップル電流を流すことができる比較的大容量のコンデンサを用いるものである。例えば、比較的廉価で大容量化が容易な電解コンデンサを用いることが可能であり、又所望の静電容量を得る為に複数のコンデンサを並列接続して構成することができる。又被試験試料としてバッテリー２に替えてコンデンサとすることもできる。又電源７は省略した構成とすることも可能である。   FIG. 1 is an explanatory diagram of Embodiment 1 of the present invention, in which 1 is a charge / discharge test apparatus, 2 is a battery BATT of a sample to be tested, 3 is a charge / discharge circuit, 4 is a ripple superposition circuit, 5 is an electronic load circuit, 6 is an AC signal generator, 7 is a DC power source, 8 is a coil, and 9 is a capacitor. The capacitor 9 is a DC cut capacitor, and the AC signal generator 6 is normally set to a frequency of about 100 Hz to 10 kHz. For measuring the characteristics of the test sample, for example, about 0.1 Hz A low frequency is also possible. The capacitor 9 is a capacitor having a relatively large capacity capable of flowing a relatively large ripple current. For example, an electrolytic capacitor that is relatively inexpensive and easy to increase in capacity can be used, and a plurality of capacitors can be connected in parallel to obtain a desired capacitance. Moreover, it can replace with the battery 2 as a sample to be tested, and can also be used as a capacitor | condenser. The power source 7 may be omitted.

電子負荷回路５は、交流信号発生部６からの交流信号に応じて内部インピーダンスを変化させる機能を有し、例えば、図４に示す従来の電子負荷回路と同様な構成を適用することができる。この電子負荷回路５は、充放電回路３と共に被試験試料のバッテリー２に対して並列接続の状態となる。従って、被試験試料のバッテリー２に流れる充電電流又は放電電流は、電子負荷回路５の内部インピーダンスの変化の交流成分に従って変化することになり、交流成分であるリップル成分が重畳されて、被試験試料のバッテリー２に流れることになる。 The electronic load circuit 5 has a function of changing the internal impedance in accordance with the AC signal from the AC signal generator 6, and for example, a configuration similar to the conventional electronic load circuit shown in FIG. 4 can be applied. The electronic load circuit 5 is connected in parallel to the battery 2 to be tested together with the charge / discharge circuit 3 . Accordingly, the charging current or discharging current flowing through the battery 2 of the test sample, Ri Do to vary according to the AC component of the change in the internal impedance of the electronic load circuit 5, the ripple component is superimposed an alternating current component, to be tested It will flow to the battery 2 of the sample.

図２は、本発明の実施例１に於けるリップル電流の説明図であり、（Ａ）はリップル重畳回路４内の交流信号発生部６からの交流信号により制御される電子負荷回路５に、バイアス電源７によって流れるリップル成分を示し、このリップル成分は、０Ａを最低の電流とした場合に於いて、ＩＰ−Ｐの振幅の電流が流れる。このリップル成分の電流の直流成分は、図２の（Ｂ）に示すように、０Ａを最低の電流値として、１／２・ＩＰ−Ｐの電流となる。それにより、コンデンサ９を介して被試験試料２に流れる電流は、図２の（Ｃ）に示すように、０Ａを中心とした正負の１／２・ＩＰ−Ｐの電流、即ち、交流電流となり、この交流電流がコンデンサ９を介して被試験試料２にリップル電流として重畳されて流れても、オフセット調整が必要でなくなる。即ち、交流信号発生部６からの交流信号の周期に従ったリップル電流を、充放電回路３による充電電流又は放電電流に重畳することにより、リップル成分の正負のバランスをとる為のオフセット調整を行うことなく、被試験試料に対する充電電流或は放電電流にリップル電流を重畳して供給することが可能となり、被試験試料に対する直流による充電試験の装置として及び放電試験の装置として、それぞれの試験時に、直流成分に影響しないように、バランスのとれたリップル電流の供給が可能となる。 FIG. 2 is an explanatory diagram of the ripple current in the first embodiment of the present invention . FIG. 2A shows an electronic load circuit 5 controlled by an AC signal from the AC signal generator 6 in the ripple superimposing circuit 4 . shows the ripple component flowing through the bias power source 7, the ripple component is, in the case where the 0A the lowest current, current flows in the amplitude of I P-P. DC component of the current of the ripple component, as shown in FIG. 2 (B), the 0A as the lowest current value, a current of 1/2 · I P-P. Thereby, the current flowing through the capacitor 9 to the sample under test 2, as shown in (C) of FIG. 2, the current of 1/2 · I P-P of the positive and negative around the 0A, i.e., alternating current next, even flow the alternating current is superposed as the ripple current through the capacitor 9 to the sample under test 2, the offset adjustment is such necessary Kunar. That is, offset adjustment for balancing the positive and negative of the ripple component is performed by superimposing the ripple current according to the cycle of the AC signal from the AC signal generator 6 on the charging current or discharging current by the charging / discharging circuit 3. without, as a device of the charging current or Ri Do can be supplied by superimposing the ripple current in the discharge current, device and as discharge test of charge test by DC with respect to the test sample with respect to the test samples, each test Sometimes, it becomes possible to supply a balanced ripple current so as not to affect the DC component.

本発明の実施例１の説明図である。It is explanatory drawing of Example 1 of this invention. 本発明の実施例１のリップル電流の説明図である。It is explanatory drawing of the ripple current of Example 1 of this invention. 従来例の説明図である。It is explanatory drawing of a prior art example. 電子負荷回路の説明図である。It is explanatory drawing of an electronic load circuit. 従来例のリップル電流の説明図である。It is explanatory drawing of the ripple current of a prior art example.

符号の説明Explanation of symbols

１ 充放電試験装置
２ 被試験試料のバッテリー
３ 充放電回路
４ リップル重畳回路
５ 電子負荷回路
６ 交流信号発生部
７ 電源
８ コイル
９ コンデンサ DESCRIPTION OF SYMBOLS 1 Charge / discharge test apparatus 2 Battery of test object 3 Charge / discharge circuit 4 Ripple superposition circuit 5 Electronic load circuit 6 AC signal generation part 7 Power supply 8 Coil 9 Capacitor

Claims (2)

コンデンサ又はバッテリーを被試験試料とし、該被試験試料にリップル電流を重畳した充放電電流を供給する充放電試験装置に於いて、
前記被試験試料に対する直流の充電又は放電を行う充放電回路と、該充放電回路と並列に接続して前記リップル電流を重畳して前記被試験試料に供給するリップル重畳回路とを含む構成を有し、
前記リップル重畳回路は、前記リップル電流の周期に従って内部インピーダンスを制御する電子負荷回路と、該電子負荷回路に直接又は直流の電源を介して接続したコイルと、該コイルと両端の前記リップル電流の周期に従った電圧を前記被試験試料に印加するように、該コイルの一端と前記被試験試料の一端との間を接続したコンデンサとを含む構成を備えた
ことを特徴とする充放電試験回路。 In a charge / discharge test apparatus that uses a capacitor or a battery as a test sample and supplies a charge / discharge current with a ripple current superimposed on the test sample ,
A charging and discharging circuit that performs a DC charging or discharging of the sample under test, the including configuration and ripple superimposition circuit supplies said to be the test sample by superimposing the ripple current is connected in parallel with said charging and discharging circuit Have
The ripple superimposing circuit includes an electronic load circuit that controls internal impedance according to the period of the ripple current, a coil that is connected to the electronic load circuit directly or via a DC power source, and a period of the ripple current between the coil and both ends. A charge / discharge test circuit comprising: a capacitor connected between one end of the coil and one end of the sample to be tested so as to apply a voltage in accordance with the sample to the sample to be tested . 前記リップル重畳回路の前記コンデンサを単一又は並列接続の複数の電解コンデンサにより構成したことを特徴とする請求項１記載の充放電試験回路。   2. The charge / discharge test circuit according to claim 1, wherein the capacitor of the ripple superimposing circuit is constituted by a plurality of electrolytic capacitors connected in a single or in parallel.
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