JP6655942B2 - Battery deterioration diagnosis device - Google Patents

Battery deterioration diagnosis device Download PDF

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JP6655942B2
JP6655942B2 JP2015205779A JP2015205779A JP6655942B2 JP 6655942 B2 JP6655942 B2 JP 6655942B2 JP 2015205779 A JP2015205779 A JP 2015205779A JP 2015205779 A JP2015205779 A JP 2015205779A JP 6655942 B2 JP6655942 B2 JP 6655942B2
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storage battery
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彰訓 加藤
彰訓 加藤
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河村電器産業株式会社
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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
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Description

本発明は、蓄電池の劣化状態を診断する蓄電池劣化診断装置に関し、特に無負荷状態で診断できる蓄電池劣化診断装置に関する。   The present invention relates to a storage battery deterioration diagnosis device for diagnosing a deterioration state of a storage battery, and more particularly to a storage battery deterioration diagnosis device capable of performing a diagnosis under no-load conditions.

データセンタや電気自動車、ハイブリッド車、電動自転車等において蓄電池が使用されているし、近年節電や安定した電力の安定化の観点から、太陽光発電や風力発電を系統連系するだけでなく、発電した電力を蓄える蓄電池がある。このように、蓄電池の用途は多様化しており、その劣化状態を正確に把握することが重要となっている。
この蓄電池の劣化を判断する従来の方法に特許文献１の技術がある。これは、蓄電池の充電電圧を一時的に下げ、一定時間経過後に上昇させてリプル電流を発生させることで、蓄電池を流れる電流の変化からインピーダンスを算出して劣化状態を診断するものであった。 Storage batteries are used in data centers, electric vehicles, hybrid vehicles, electric bicycles, etc.In recent years, from the viewpoint of power saving and stable power stabilization, not only solar power generation and wind power generation There is a storage battery that stores the generated power. As described above, the use of the storage battery is diversified, and it is important to accurately grasp the deterioration state.
As a conventional method for determining the deterioration of the storage battery, there is a technique disclosed in Patent Document 1. In this method, a charging voltage of a storage battery is temporarily lowered and then increased after a lapse of a predetermined time to generate a ripple current, whereby impedance is calculated from a change in current flowing through the storage battery to diagnose a deterioration state.

特開２００２−１０１５７１号公報JP-A-2002-101571

上記特許文献１の技術は、それまでは負荷を接続して実際に通電して判定していた劣化の判断を負荷を接続することなく診断できた。しかしながら、サイリスタ整流器に対して蓄電池の充電電圧を制御する電圧支持信号発生手段に加えて、蓄電池の内部抵抗を算出する内部抵抗算出手段が必要であり、ＣＰＵを使用した複雑な演算回路が必要であった。   The technology of Patent Document 1 described above can diagnose the deterioration that has been determined by connecting a load and actually energizing without connecting the load. However, in addition to the voltage support signal generating means for controlling the charging voltage of the storage battery with respect to the thyristor rectifier, an internal resistance calculation means for calculating the internal resistance of the storage battery is required, and a complicated arithmetic circuit using a CPU is required. there were.

そこで、本発明はこのような問題点に鑑み、蓄電池の劣化を簡易な回路で判定できる蓄電池劣化診断装置を提供することを目的としている。   In view of the foregoing, an object of the present invention is to provide a storage battery deterioration diagnosis device that can determine deterioration of a storage battery with a simple circuit.

上記課題を解決する為に、請求項１の発明に係る蓄電池劣化診断装置は、蓄電池に対してリプル電圧を発生させるために一定の交流電流を供給するリプル発生手段と、供給された交流電流により蓄電池に発生したリプル電圧から蓄電池の劣化を判定する劣化判定回路とを有し、劣化判定回路が、発生したリプル電圧を増幅するリプル電圧増幅回路と、リプル電圧増幅回路の出力電圧を平滑化する平滑回路と、直列接続された複数のＬＥＤから成る表示部、及び平滑回路の出力電圧によりＬＥＤを個々に駆動する駆動回路とを有し、更にリプル電圧増幅回路が、非反転増幅回路から成る第１増幅回路、当該第１増幅回路の出力信号を増幅する反転増幅回路から成る第２増幅回路、及び蓄電池の出力電圧を最大値として、第１増幅回路及び第２増幅回路の出力により変動する電圧を平滑回路に出力する出力回路を有し、平滑回路は、出力回路の出力を受けて、リプル電圧の振幅が増大したら、リプル電圧の振幅に反比例して低下する電圧を出力し、表示部の点灯するＬＥＤ数が減少することを特徴とする。
この構成によれば、蓄電池の内部インピーダンスの変化をリプル電圧を発生させて検出し、このリプル電圧を受けて発光するＬＥＤの数を変化させて劣化度を診断するため、デジタル演算回路を使用すること無く簡易な回路で蓄電池の劣化状態の判定が可能となり、安価に構成できる。 In order to solve the above problem, a storage battery deterioration diagnosis apparatus according to the first aspect of the present invention includes a ripple generation unit that supplies a constant AC current to generate a ripple voltage for a storage battery, and a supply of the AC current. A deterioration determination circuit for determining deterioration of the storage battery from the ripple voltage generated in the storage battery, wherein the deterioration determination circuit smoothes an output voltage of the ripple voltage amplification circuit that amplifies the generated ripple voltage and an output voltage of the ripple voltage amplification circuit A smoothing circuit, a display unit including a plurality of LEDs connected in series, and a drive circuit for individually driving the LEDs by an output voltage of the smoothing circuit; and a ripple voltage amplifier circuit including a non-inverting amplifier circuit. A first amplifier circuit, a second amplifier circuit including an inverting amplifier circuit for amplifying an output signal of the first amplifier circuit, and a first amplifier circuit and a second amplifier circuit with the output voltage of the storage battery being the maximum value. An output circuit that outputs a voltage that fluctuates due to an output of the circuit to a smoothing circuit. The smoothing circuit receives the output of the output circuit, and when the amplitude of the ripple voltage increases, the voltage decreases in inverse proportion to the amplitude of the ripple voltage. Is output, and the number of lit LEDs of the display unit is reduced .
According to this configuration, a digital arithmetic circuit is used to detect a change in the internal impedance of the storage battery by generating a ripple voltage and changing the number of LEDs that emit light in response to the ripple voltage to diagnose the degree of deterioration. It is possible to judge the deterioration state of the storage battery with a simple circuit without any trouble, and the configuration can be made at low cost.

また、リプル電圧増幅回路が２個のオペアンプで構成でき簡易な回路構成で済む。 Further, the ripple voltage amplifier circuit can be composed of two operational amplifiers, so that a simple circuit configuration is sufficient.

加えて、点灯するＬＥＤの数の減少により劣化の進行を認識でき、発光するＬＥＤ数が蓄電池の状態を現し判断し易い。 In addition, the progress of the deterioration can be recognized by the decrease in the number of illuminated LEDs, and the number of illuminated LEDs indicates the state of the storage battery and is easily determined.

本発明によれば、蓄電池の内部インピーダンスの変化をリプル電圧を発生させて検出し、このリプル電圧を受けて発光するＬＥＤの数を変化させて劣化度を診断するため、デジタル演算回路を使用すること無く簡易な回路で蓄電池の劣化状態の判定が可能となる。そして、アナログ回路により判定回路を構成できるため安価に構成できる。   According to the present invention, a digital arithmetic circuit is used to detect a change in the internal impedance of a storage battery by generating a ripple voltage and to change the number of LEDs that emit light in response to the ripple voltage to diagnose the degree of deterioration. This makes it possible to determine the state of deterioration of the storage battery with a simple circuit without any problem. Further, since the determination circuit can be configured by an analog circuit, it can be configured at a low cost.

本発明に係る蓄電池劣化診断装置の一例を示す回路図である。It is a circuit diagram showing an example of a storage battery deterioration diagnosis device according to the present invention. リプル電圧増幅回路の説明図である。FIG. 3 is an explanatory diagram of a ripple voltage amplifier circuit. 図２に示す回路の主要点の波形説明図であり、（ａ）は蓄電池の劣化が小さい場合、（ｂ）は劣化が大きい場合を示している。3A and 3B are waveform explanatory diagrams of main points of the circuit shown in FIG. 2, wherein FIG. 3A shows a case where deterioration of a storage battery is small, and FIG.

本発明を具体化した実施の形態を、図面を参照して詳細に説明する。図１は本発明に係る蓄電池劣化診断装置の一例を示す回路図であり、１は診断対象の蓄電池、２は蓄電池１にリプル電圧を発生させるリプル電流供給回路（リプル発生手段）、３は劣化判定回路であり、リプル電流供給回路２と劣化判定回路３とで蓄電池劣化診断装置を構成している。   Embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an example of a storage battery deterioration diagnosis apparatus according to the present invention. 1 is a storage battery to be diagnosed, 2 is a ripple current supply circuit (ripple generation means) for generating a ripple voltage in the storage battery 1, and 3 is deterioration. This is a determination circuit, and the ripple current supply circuit 2 and the deterioration determination circuit 3 constitute a storage battery deterioration diagnosis device.

リプル電流供給回路２は、例えば周波数１Ｈｚの交流電流を出力して蓄電池１に供給する。   The ripple current supply circuit 2 outputs, for example, an alternating current having a frequency of 1 Hz and supplies the alternating current to the storage battery 1.

劣化判定回路３は、リプル電流が供給されることで蓄電池１に発生するリプル電圧を増幅するリプル電圧増幅回路３１と、増幅された電圧によりＬＥＤ発光させて劣化状態を表示する劣化度表示部３２とを有している。   The deterioration determination circuit 3 includes a ripple voltage amplifying circuit 31 that amplifies a ripple voltage generated in the storage battery 1 when a ripple current is supplied, and a deterioration degree display unit 32 that causes the amplified voltage to emit LED light to display a deterioration state. And

リプル電圧増幅回路３１は、非反転増幅回路から成る第１増幅回路Ｑ１、及びこの第１増幅回路Ｑ１の出力を増幅する反転増幅回路から成る第２増幅回路Ｑ２を備えた２段の増幅回路と、直列接続された３個のダイオード（第１ダイオードＤ１、第２ダイオードＤ２、第３ダイオードＤ３）から成り、双方の増幅回路Ｑ１，Ｑ２の出力電圧を基に劣化度表示部３２の駆動電圧を発生する出力回路３１ａとを有している。   The ripple voltage amplifying circuit 31 includes a two-stage amplifying circuit including a first amplifying circuit Q1 including a non-inverting amplifying circuit, and a second amplifying circuit Q2 including an inverting amplifying circuit for amplifying an output of the first amplifying circuit Q1. And three diodes (a first diode D1, a second diode D2, and a third diode D3) connected in series. Based on the output voltages of the two amplifier circuits Q1 and Q2, the drive voltage of the deterioration degree display unit 32 is determined. And an output circuit 31a.

また劣化度表示部３２は、直列接続された複数のＬＥＤ列（ここでは５個のＬＥＤ）から成る表示部３２ａ、それぞれのＬＥＤを駆動させる駆動回路３２ｂ、表示部３２ａを安定して発光させるために出力回路３１ａの変動する出力電圧を平滑化する平滑回路３２ｃを有している。   Further, the deterioration degree display unit 32 includes a display unit 32a including a plurality of LED strings (here, five LEDs) connected in series, a driving circuit 32b for driving each LED, and a display unit 32a for stably emitting light. And a smoothing circuit 32c for smoothing the fluctuating output voltage of the output circuit 31a.

このように構成されたリプル電圧増幅回路３１は具体的に以下の様に動作する。図２、図３を参照して説明する。図２はリプル電圧増幅回路３１を抜き出した回路図、図３は図２に示す回路の主要点の波形説明図であり、（ａ）は蓄電池の劣化が小さい場合、（ｂ）は劣化が大きい場合を示している。
図３におけるＳ１からＳ６の波形は図２に示す個々の点の波形であり、Ｓ１点は蓄電池１に発生したリプル電圧の波形であり、この波形が第１増幅回路Ｑ１に入力される。Ｓ２点は第１増幅回路Ｑ１の出力電圧波形、Ｓ３点は第２ダイオードＤ２のアノード電圧波形、Ｓ４は第２ダイオードＤ２のカソード電圧波形、Ｓ５は出力回路３１ａの出力電圧波形、Ｓ６は平滑回路３２ｃの出力波形であり、表示部３２ａの駆動電圧波形である。また、Ｍ点は蓄電池１の端子電圧（例えば、１２ボルト）にほぼ等しい一定の電圧が印加されている。
但し、第１増幅回路Ｑ１、及び第２増幅回路Ｑ２の増幅率Ａｖを共に１とし、先ず蓄電池１の劣化度が小さい（劣化していない状態を含む）場合から説明する。 The ripple voltage amplifying circuit 31 configured as above operates specifically as follows. This will be described with reference to FIGS. 2 is a circuit diagram extracted from the ripple voltage amplifying circuit 31, FIG. 3 is a waveform explanatory diagram of the main points of the circuit shown in FIG. 2, (a) when the deterioration of the storage battery is small, and (b) is large. Shows the case.
The waveforms of S1 to S6 in FIG. 3 are the waveforms at the individual points shown in FIG. 2, and the point S1 is the waveform of the ripple voltage generated in the storage battery 1, and this waveform is input to the first amplifier circuit Q1. Point S2 is the output voltage waveform of the first amplifier circuit Q1, point S3 is the anode voltage waveform of the second diode D2, S4 is the cathode voltage waveform of the second diode D2, S5 is the output voltage waveform of the output circuit 31a, and S6 is the smoothing circuit. 32C is an output waveform of the display section 32a. At the point M, a constant voltage substantially equal to the terminal voltage of the storage battery 1 (for example, 12 volts) is applied.
However, the amplification factors Av of the first amplifier circuit Q1 and the second amplifier circuit Q2 are both set to 1, and the case where the deterioration degree of the storage battery 1 is small (including the state where the storage battery 1 is not deteriorated) will be described first.

＜劣化度が小さい場合＞
第１増幅回路Ｑ１の利得が１であるため、Ｓ１点の波形に対してＳ２点は同一の波形となる。尚、リプル電流供給回路２が出力する一定の交流電流により、Ｓ１点に発生するリプル電圧の振幅は１ボルトとして説明する。
一方、第２増幅回路Ｑ１の出力は、Ｓ２点がプラス波形の時はマイナス波形となるし、逆にＳ２点がマイナス波形の時はプラス波形となる。この結果、Ｓ３点の電圧はＳ２点がプラス波形のピーク時はほぼＭ点の電圧となり、Ｓ３点から電圧の低いＳ４点に電流（図２に示す矢印Ｈ１）が流れる。 <When the degree of deterioration is small>
Since the gain of the first amplifier circuit Q1 is 1, the waveform at point S2 is the same as the waveform at point S1. The amplitude of the ripple voltage generated at the point S1 due to the constant AC current output from the ripple current supply circuit 2 is 1 volt.
On the other hand, the output of the second amplifier circuit Q1 has a minus waveform when the point S2 has a plus waveform, and has a plus waveform when the point S2 has a minus waveform. As a result, the voltage at the point S3 becomes substantially the voltage at the point M when the positive waveform of the point S2 is at the peak, and a current (arrow H1 shown in FIG. 2) flows from the point S3 to the lower voltage point S4.

また、Ｓ２点がマイナス波形の時、Ｓ４点はＳ３点より高電位となるが、第２ダイオードＤ２を逆流しないため、第３ダイオードＤ３を介してＭ点に向けて電流が流れる（図２に示す矢印Ｈ２）。そのため、矢印Ｈ１に示す電流の流れが発生した時のＳ４点の電圧を基準（電圧をＶａとする）にすると、図３（ａ）に示すようにＳ３点では第２ダイオードＤ２の電圧降下Ｖｆを加えたＶａ＋Ｖｆの電圧を最大値、Ｖａ＋Ｖｆ−２ボルトの電圧を最小値とする振幅１ボルトのリプル電圧が発生する。   When point S2 has a negative waveform, point S4 has a higher potential than point S3, but does not flow backward through the second diode D2, so that current flows toward point M via the third diode D3 (see FIG. 2). Arrow H2). Therefore, when the voltage at the point S4 when the current flow indicated by the arrow H1 occurs is set as a reference (the voltage is defined as Va), the voltage drop Vf of the second diode D2 at the point S3 as shown in FIG. , A ripple voltage having an amplitude of 1 volt is generated with the voltage of Va + Vf as the maximum value and the voltage of Va + Vf-2 volts as the minimum value.

尚、この電圧を蓄電池１が出力する電圧を基準に見ると、Ｍ点の電圧は蓄電池１の出力電圧にほぼ等しい一定電圧（Ｖｍとする）が印加されているため、Ｓ３点には抵抗Ｒ４及び第１ダイオードＤ１の電圧降下分を引いた直流電圧が印加されている。そのため、Ｖｍ−Ｖｆを最大値とする振幅１ボルトのリプル電圧が発生すると見ることもできる。   When this voltage is viewed on the basis of the voltage output from the storage battery 1, the voltage at point M is a constant voltage (Vm) substantially equal to the output voltage of the storage battery 1. A DC voltage obtained by subtracting the voltage drop of the first diode D1 is applied. Therefore, it can be considered that a ripple voltage having an amplitude of 1 volt having a maximum value of Vm-Vf is generated.

一方、Ｓ４点で発生する電圧は、矢印Ｈ１の電流によりコンデンサＣ２が充電され電圧が上昇し、Ｓ１点がマイナスの波形になる時点でＶｍ＋Ｖｆの電圧となり、矢印Ｈ２で示す電流の流れが発生する。
こうしてＳ４点は図３（ａ）に示す波形となり、Ｓ５点の波形はＳ３点の波形に準ずる変動を示し、Ｖａ＋Ｖｆをピークとする振幅１ボルトの変化を示す。そして、このＶａ＋ＶｆはＭ点の電圧Ｖｍにほぼ等しく、Ｓ５点はＶｍ〜Ｖｍ−２ボルトの間で変動するとみることができる。
そしてＳ６点の電圧波形は、Ｓ５点の電圧波形が平滑回路３２ｃにより平滑化されてＶｍ−１ボルトの電圧に近い直流電圧Ｖｄの高い電圧となる。この結果、表示部３２ａは例えば５個全てのダイオードが発光する。 On the other hand, the voltage generated at the point S4 becomes the voltage of Vm + Vf when the capacitor C2 is charged by the current of the arrow H1 and the voltage rises, and the point S1 becomes a negative waveform, and the current flow indicated by the arrow H2 occurs. .
Thus, the waveform at the point S4 becomes the waveform shown in FIG. 3A, the waveform at the point S5 shows a fluctuation similar to the waveform at the point S3, and shows a change in amplitude of 1 volt having a peak at Va + Vf. This Va + Vf is substantially equal to the voltage Vm at the point M, and the point S5 can be considered to fluctuate between Vm and Vm-2 volts.
The voltage waveform at the point S6 is smoothed by the smoothing circuit 32c at the point S5, and becomes a high DC voltage Vd close to the voltage of Vm-1 volt. As a result, in the display section 32a, for example, all five diodes emit light.

＜劣化度が大きい場合＞
次に蓄電池１の劣化が進んだ場合を説明する。蓄電池１が劣化すると次のような動作となる。劣化が進行すると内部インピーダンスが増加するため、印加するリプル電流が上記劣化小の場合と同一であっても、発生するリプル電圧は大きくなる。図３（ｂ）では、Ｓ１点の電圧波形が一例として振幅２ボルトの場合を示している。
このときＳ２点の波形はＳ１点と同一の波形が出力されるが、第２増幅回路Ｑ２の出力は、上述したように反転した波形となる。この結果、Ｓ３点の電圧はＳ２点がプラス波形の時はほぼＭ点の電圧となり、Ｓ３点からＳ４点に電流（図２に示す矢印Ｈ１）が流れる。 <When the degree of deterioration is large>
Next, a case where the deterioration of the storage battery 1 has progressed will be described. When the storage battery 1 deteriorates, the following operation is performed. As the deterioration progresses, the internal impedance increases. Therefore, even if the applied ripple current is the same as the case where the deterioration is small, the generated ripple voltage increases. FIG. 3B shows a case where the voltage waveform at the point S1 has an amplitude of 2 volts as an example.
At this time, the waveform at the point S2 is the same as the waveform at the point S1, but the output of the second amplifier circuit Q2 is the inverted waveform as described above. As a result, the voltage at the point S3 becomes substantially the voltage at the point M when the point S2 has a positive waveform, and a current (arrow H1 shown in FIG. 2) flows from the point S3 to the point S4.

また、Ｓ２点がマイナス波形の時、Ｓ４点はＳ３点より高電位となるが、第２ダイオードＤ２を逆流しないため、第３ダイオードＤ３を介してＭ点に向けて電流が流れる（図２に示す矢印Ｈ２）。そのため、劣化度が小さい場合と同様に、矢印Ｈ１の電流の流れが発生した時のＳ４点の電圧を基準（電圧をＶｂとする）にすると、Ｓ３点では第２ダイオードＤ２の電圧降下Ｖｆを加えたＶｂ＋Ｖｆの電圧を最大値とするリプル電圧が発生する。   When point S2 has a negative waveform, point S4 has a higher potential than point S3, but does not flow backward through the second diode D2, so that current flows toward point M via the third diode D3 (see FIG. 2). Arrow H2). Therefore, as in the case where the degree of deterioration is small, when the voltage at the point S4 when the current flow of the arrow H1 occurs is set as a reference (the voltage is Vb), the voltage drop Vf of the second diode D2 at the point S3 is A ripple voltage having the added voltage Vb + Vf as a maximum value is generated.

尚、この電圧を蓄電池１が出力する電圧を基準に見ると、Ｍ点の電圧はＶｍであるため、Ｓ３点の電圧は抵抗Ｒ４及び第１ダイオードＤ１に電圧降下分を引いた直流電圧が印加されており、Ｖｍ−Ｖｆを最大値とする振幅２ボルト弱の波形が発生すると見ることができる。   When this voltage is viewed with reference to the voltage output from the storage battery 1, since the voltage at the point M is Vm, the voltage at the point S3 is a DC voltage obtained by subtracting a voltage drop from the resistor R4 and the first diode D1. It can be seen that a waveform having an amplitude of slightly less than 2 volts with Vm-Vf as the maximum value is generated.

一方、Ｓ４点で発生する電圧は、矢印Ｈ１の電流によりコンデンサＣ２が充電されて電圧が上昇し、Ｓ１点がマイナスの波形になる時点でＶｍ＋Ｖｆの電圧となり、矢印Ｈ２の電流の流れが発生する。こうしてＳ３，Ｓ４点は図３（ｂ）に示す波形となり、Ｓ５点の波形はＳ３点の波形に準ずる変動を示す。
但し、Ｓ４点の電圧はＶｍ＋Ｖｆより高い電圧と成ることがないため、Ｓ１点のプラス側波形に追従した波形とならず、プラス側はリプル電圧に比例しなくなる。一方、マイナス側波形はＳ１に追従して変化する。 On the other hand, the voltage generated at the point S4 becomes the voltage of Vm + Vf when the capacitor C2 is charged by the current of the arrow H1 and the voltage rises and the point S1 becomes a negative waveform, and the current of the arrow H2 occurs. . Thus, points S3 and S4 have the waveforms shown in FIG. 3 (b), and the waveform at point S5 shows a variation similar to the waveform at point S3.
However, since the voltage at the point S4 does not become higher than Vm + Vf, the waveform does not follow the plus side waveform at the point S1, and the plus side is not proportional to the ripple voltage. On the other hand, the negative waveform changes following S1.

その結果、Ｓ５点の波形（及びＳ３点の波形も）もプラス側は大きく変化せずマイナス側の振幅のみ入力に比例して大きくなり、Ｓ５点はＶｍ〜Ｖｍ−４ボルトの間で変動するとみることができる。
よって、平滑回路３２ｃによりＳ６点の電圧はＶｍ−２ボルトの電圧に近い直流電圧Ｖｅの電圧となる。この結果、表示部３２ａは例えば５個のダイオードのうち２個が発光する。 As a result, the waveform at the point S5 (and also the waveform at the point S3) does not largely change on the plus side but increases only on the minus side in proportion to the input. When the point S5 fluctuates between Vm and Vm-4 volts, You can see.
Therefore, the voltage at the point S6 becomes a DC voltage Ve close to the voltage of Vm-2 volts by the smoothing circuit 32c. As a result, in the display section 32a, for example, two of the five diodes emit light.

このように、蓄電池１の内部インピーダンスの変化をリプル電圧を発生させて検出し、このリプル電圧を受けて表示部３２ａの発光ＬＥＤの数を変化させて劣化度を診断するため、デジタル演算回路を使用すること無く簡易な回路で蓄電池の劣化状態の判定が可能となり安価に構成できる。
また、リプル電圧増幅回路３１が２個のオペアンプで構成でき簡易な回路構成で済むし、点灯するＬＥＤの数の減少により劣化の進行を認識でき、発光するＬＥＤ数が蓄電池の状態を現し判断し易い。 As described above, a digital arithmetic circuit is used to detect a change in the internal impedance of the storage battery 1 by generating a ripple voltage and detecting the degree of deterioration by receiving the ripple voltage and changing the number of light emitting LEDs of the display unit 32a. The deterioration state of the storage battery can be determined with a simple circuit without using it, and the configuration can be made inexpensively.
In addition, the ripple voltage amplifier circuit 31 can be composed of two operational amplifiers, and a simple circuit configuration can be used. The reduction in the number of illuminated LEDs allows the progress of deterioration to be recognized, and the number of illuminated LEDs indicates the state of the storage battery. easy.

尚、上記実施形態は、増幅回路Ｑ１，Ｑ２の増幅率をいずれも１として説明したが、増幅率の設定は任意である。また発生させるリプル電圧に於いても、正常時は振幅１ボルトとしたが、この発生させるリプル電圧も任意である。
また、リプル電流供給回路２が出力する電流の周波数を１Ｈｚとしたが、０．５〜５Ｈｚの周波数であれば、蓄電池１のインピーダンス上昇を検出し易く劣化を判断し易い。 In the above embodiment, the amplification factors of the amplification circuits Q1 and Q2 are both set to 1. However, the amplification factor can be set arbitrarily. The ripple voltage to be generated is also 1 volt in the normal state, but the ripple voltage to be generated is also arbitrary.
Further, the frequency of the current output from the ripple current supply circuit 2 is set to 1 Hz. However, if the frequency is 0.5 to 5 Hz, it is easy to detect an increase in the impedance of the storage battery 1 and to judge deterioration.

１・・蓄電池、２・・リプル電流供給回路（リプル発生手段）、３・・劣化判定回路、３１・・リプル電圧増幅回路、３２・・劣化度表示部、３２ａ・・表示部、３２ｂ・・駆動回路、３２ｃ・・平滑回路、Ｑ１・・第１増幅回路、Ｑ２・・第２増幅回路。   1. Storage battery, 2. Ripple current supply circuit (ripple generation means), 3. Deterioration determination circuit, 31 Ripple voltage amplifier circuit, 32 Deterioration degree display part, 32a Display part, 32b ... Driving circuit, 32c ... smoothing circuit, Q1 ... first amplifier circuit, Q2 ... second amplifier circuit.

Claims (1)

蓄電池に対してリプル電圧を発生させるために一定の交流電流を供給するリプル発生手段と、
供給された交流電流により蓄電池に発生したリプル電圧から蓄電池の劣化を判定する劣化判定回路とを有し、
前記劣化判定回路が、発生したリプル電圧を増幅するリプル電圧増幅回路と、
前記リプル電圧増幅回路の出力電圧を平滑化する平滑回路と、
直列接続された複数のＬＥＤから成る表示部、及び前記平滑回路の出力電圧により前記ＬＥＤを個々に駆動する駆動回路とを有し、
更に前記リプル電圧増幅回路が、非反転増幅回路から成る第１増幅回路、当該第１増幅回路の出力信号を増幅する反転増幅回路から成る第２増幅回路、及び前記蓄電池の出力電圧を最大値として、前記第１増幅回路及び前記第２増幅回路の出力により変動する電圧を前記平滑回路に出力する出力回路を有し、
前記平滑回路は、前記出力回路の出力を受けて、前記リプル電圧の振幅が増大したら、前記リプル電圧の振幅に反比例して低下する電圧を出力し、前記表示部の点灯するＬＥＤ数が減少することを特徴とする蓄電池劣化診断装置。 A ripple generating means for supplying a constant alternating current to generate a ripple voltage for the storage battery,
A deterioration determination circuit that determines the deterioration of the storage battery from the ripple voltage generated in the storage battery by the supplied AC current,
The degradation determination circuit, a ripple voltage amplification circuit that amplifies the generated ripple voltage,
A smoothing circuit for smoothing the output voltage of the ripple voltage amplifier circuit,
A display unit including a plurality of LEDs connected in series, and a driving circuit that individually drives the LEDs by an output voltage of the smoothing circuit,
Further, the ripple voltage amplifier circuit includes a first amplifier circuit including a non-inverting amplifier circuit, a second amplifier circuit including an inverting amplifier circuit for amplifying an output signal of the first amplifier circuit, and an output voltage of the storage battery as a maximum value. An output circuit that outputs a voltage that fluctuates according to outputs of the first amplifier circuit and the second amplifier circuit to the smoothing circuit,
The smoothing circuit receives the output of the output circuit, and when the amplitude of the ripple voltage increases, outputs a voltage that decreases in inverse proportion to the amplitude of the ripple voltage, and the number of lighted LEDs of the display unit decreases. A storage battery deterioration diagnosis device characterized by the above-mentioned.
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