To eliminate an error due to the thermal electromotive force of different kinds of metal and detect a battery current with extremely high accuracy.SOLUTION: A current detector comprises: a shunt resistor 2 created by connecting, to an output terminal 22, a resistive element 21 of different kinds of metal differing from the output terminal part 22 in electric conductivity; a voltage detection circuit 3 for detecting a voltage drop of the shunt resistor 2; a main temperature detector 4 for detecting the temperature of a first edge 2A of the shunt resistor 2; a sub-temperature detector 5 for detecting the temperature of a second edge 2B of the shunt resistor 2; a thermal electromotive force detection circuit 6 for specifying the thermal electromotive force of the shunt resistor 2 from the detected temperatures of the main temperature detector 4 and sub-temperature detector 5; and a current computation circuit 8 for computing a current value flowing in the shunt resistor 2 from the voltage drop detected by the voltage detection circuit 3, the thermal electromotive force specified by the thermal electromotive force detection circuit 6 and the resistance value of the shunt resistor 2.SELECTED DRAWING: Figure 1

    【課題】異種金属の熱起電力による誤差を解消して電池電流を極めて高い精度で検出する。【解決手段】電流検出器は、出力端子部22と異なる導電率の異種金属の抵抗素体21を出力端子部22に接続してなるシャント抵抗器2と、シャント抵抗器2の電圧降下を検出する電圧検出回路3と、シャント抵抗器2の第1の端部2Aの温度を検出する主温度検出器4と、シャント抵抗器2の第2の端部2Bの温度を検出するサブ温度検出器5と、主温度検出器4及びサブ温度検出器5の検出温度からシャント抵抗器2の熱起電力を特定する熱起電力検出回路6と、電圧検出回路3で検出する電圧降下と、熱起電力検出回路6で特定されるシャント抵抗器2の熱起電力と、シャント抵抗器2の抵抗値からシャント抵抗器2に流れる電流値を演算する電流演算回路8とを備えている。【選択図】図1


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    Titel :

    BATTERY CURRENT DETECTOR, AND ELECTRIC VEHICLE AND POWER STORAGE DEVICE EQUIPPED WITH CURRENT DETECTOR


    Weitere Titelangaben:

    電池の電流検出器と電流検出器を備える電動車両及び蓄電装置


    Beteiligte:
    NAKANO SHINYA (Autor:in)

    Erscheinungsdatum :

    2019-08-22


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung



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