To improve the heat dissipation of a shunt resistor by taking into account the occurrence of warpage in a substrate when the substrate is fixed to a fixing object to suppress the deterioration of the resolution of a current.SOLUTION: An EPS-ECU(Electric Power Steering-Electric Control Unit) 60 controls a motor 20 with a brush to control the steering of a vehicle 1, and includes a substrate 100, a current detection circuit 110 including a shunt resistor R1 mounted on a main surface 101 of the substrate 100, MOS-FET 120a to 120d, and a substrate fixing/heat dissipation structure 130 including a base part 131, substrate fixing parts 132a to 132d, a heat dissipation part for MOS-FET 133 and a heat dissipation part for shunt resistor 134, arranged on the rear surface side of the substrate 100. The shunt resistor R1 is surface-mounted on an end part of the main surface 101 of the substrate 100, the substrate 100 is fixed to the substrate fixing/heat dissipation structure 130 by attaching an end side of the substrate with respect to the shunt resistor R1 to the substrate fixing part 132a, and the heat dissipation part for shunt resistor 134 is connected to the heat dissipation part for MOS-FET 133.SELECTED DRAWING: Figure 1

    【課題】電流の分解能の低下を抑えるために基板を固定対象に固定した場合に基板に反りが発生することを考慮してシャント抵抗の放熱性を向上させる。【解決手段】EPS-ECU60は、ブラシ付きモータ20を制御して車両1の操舵制御を行うものであり、基板100と、基板100の主面101に実装されたシャント抵抗R1を含む電流検出回路110およびMOS-FET120a~120dと、基板100の裏面側に配置される、基台部131、基板固定部132a~132d、MOS-FET用放熱部133およびシャント抵抗用放熱部134を備える基板固定・放熱構造体130とを備え、シャント抵抗R1は基板100の主面101の端部に面実装され、基板100のシャント抵抗R1よりも端辺側が基板固定部132aに取り付けたりして基板固定・放熱構造体130に固定され、シャント抵抗用放熱部135はMOS-FET用放熱部134と繋がっている。【選択図】図1


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    Title :

    CONTROL UNIT FOR ELECTRIC POWER STEERING


    Additional title:

    電動パワーステアリングの制御装置


    Contributors:

    Publication date :

    2024-04-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern



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