| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid a thermal influence on peripheral electronic components by positioning high-speed switching elements being high heat generation sources dispersedly and by preventing a deterioration in the heat radiation efficiency of a heat sink. <P>SOLUTION: A control board 20, which constitutes an ECU10, is equipped with switching elements 25a, 25b, 25c, 26a, 26b, and 26c which constitute a motor driving circuit for PWM-driving a motor. For these switching elements, high-speed switching elements 26a, 26b, and 26c and low-speed switching elements 25a, 25b, and 25c are attached, being arranged alternately, to the heat sink 27 fixed to the board 20a. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
