EMI FILTER AND POWER EMI FILTER ACCESS CIRCUIT

摘要

An EMI filter and a power EMI filter access circuit. The EMI filter comprises a tunable common mode inductor (L1), a first and a second differential-mode working capacitor (CX) that are connected in parallel with an input end and an out end of the tunable common mode inductor respectively, a tunable differential-mode inductor (L2) whose input end is connected in series with the output end of the tunable common mode inductor, and a first and a second common mode working capacitor (CY) that are connected in series with the input end of the tunable differential-mode inductor. The EMI filter can provide a relatively high insertion loss within a conducted interference frequency range, so as to attenuate the EMI signal to the maximum degree, thus making the device meet an electromagnetic standard, and effectively improving the filtering effect.