| 摘要 |
PROBLEM TO BE SOLVED: To reduce transmission and radiation EMI in a motor drive application by inserting an inductor into the ground line of a motor drive circuit. SOLUTION: In a motor drive circuit 40, inductors 42 and 44 are inserted into a ground line 46. High frequency current flowing in the loop is reduced, a ground loop area on a printed board is narrowed, and therefore radiation EMI is reduced. A power device is capacitively coupled to a heat sink and current generated by capacitive coupling flows and is returned to a heat sink connection. Thus, transmission and radiation EMI in a motor drive application can be reduced. |
