| 摘要 |
PROBLEM TO BE SOLVED: To prevent high frequency noises generated at turning ON/OFF of a semiconductor switching element.SOLUTION: The electric power conversion unit includes: a housing which stores an inverter unit disposed at a position higher than the ground surface of a frame or wall; a wire insertion part with a DC power wire connected to the inverter unit and a wiring connected to a circuit are inserted, which is provide on the bottom face or a lower part of the housing; and a cylindrical member which encloses the wire insertion part and generally entire of the bottom face of the housing and which extends downward by a length to suppress the amount of high frequency noises caused from pseudo sine waves, which may be radiated to the circumstances of the housing. |
