To perform diagnosis before start of power supply of malfunction of a switching element leading to short-cut between terminals of a main power supply.SOLUTION: An auxiliary power supply device 13 comprises a charge/discharge circuit C1 including: a capacitor 24 in which a polar plate 24C on a negative electrode side is connected to a low potential line 23 connected to an input port 20 via a main relay 22; a chopper coil 25 whose one end is connected to the low potential line 23 and the other end is connected to a ground via an FET 1, and the other end is connected to a polar plate 24D on a positive electrode side of the capacitor 24 via an FET 2; and an FET 3 for discharge interposed between a high potential line 26 and an output port 21. The auxiliary power supply device is provided with: a pull-up resistor 27 whose one end is connected to the input port 20 via the main relay 22 and the other end is connected to the high potential line 26 connecting the FET 2 and the polar plate 24D; and an FET 9 installed in a portion between a connection point of the pull-up resistor 27 in the high potential line 26 and the polar plate 24D.SELECTED DRAWING: Figure 2

    【課題】主電源の端子間の短絡を招くスイッチング素子の故障の給電開始前の診断を可能とする。【解決手段】メインリレー22を介して入力ポート20に接続された低電位ライン23に負極側の極板24Cが接続された蓄電器24と、一端が低電位ライン23に接続されるとともに、他端がFET1を介してグランドに接続され、且つ同他端がFET2を介して蓄電器24の正極側の極板24Dに接続されたチョッパコイル25と、高電位ライン26と出力ポート21との間に介設された放電用のFET3と、を有した充放電回路C1を備える補助電源装置13において、一端がメインリレー22を介さずに入力ポート20に接続され、且つFET2と極板24Dとを接続する高電位ライン26に他端が接続されたプルアップ抵抗27と、高電位ライン26におけるプルアップ抵抗27の接続点と極板24Dとの間の部分に設置されたFET9と、を設けるようにした。【選択図】図2


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    Title :

    AUXILIARY POWER DEVICE AND ELECTRIC POWER STEERING DEVICE


    Additional title:

    補助電源装置及び電動パワーステアリング装置


    Contributors:

    Publication date :

    2019-12-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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