METHOD FOR SUPPRESSION OF COMMON-MODE CURRENT AND EMI USING CORRUGATED APERTURE

摘要

In general, electrical and electronic equipment are internal parts of the substrate element and the printed circuit: uses a housing (enclosure) made of a conductive material to the (Printed CircuitBoard PCB) protected mechanically and electrically shielded. In addition, the use of the input? Output line connection, grooves of various shapes and sizes on the housing, such as for heat dissipation of the internal housing (slot), seams (seam) or the opening (aperture) is essential for the implementation of the function unit. Electromagnetic interference (EMI) problem simgakhaejyeo to go, and, in particular, adjacent to the peripheral line the high-speed signal of an internal PCB flowing according to the unnecessary electromagnetic waves generated through the input and output cable, and the opening of the enclosure that is connected to the housing in accordance with the use of the latest high-speed signal the common mode current (common-mode current) by the electromagnetic coupling to the line occurs, and this is the noise power acts on the cable connected to the exterior of the housing known as the main EMI generation mechanism to generate an electromagnetic wave.; The invention mouth to reduce the copy EMI is due to common mode currents on the copy through the groove, seams or openings the unnecessary electromagnetic waves generated in the devices made in the housing to the outside or connected to the PCB or enclosure cable?, And the output signal by applying the goal shape (Corrugation) to the opening (aperture) used for the enclosure, for example, for power supply to a method of reducing a common-mode current or the EMI in the desired frequency band.