How to add a filter circuit to address excessive harmonics in the power supply of an edge box?

Excessive harmonics in the power supply of edge boxes often manifest as excessive 3rd and 5th odd harmonic currents. Passive filter circuits are low-cost and highly reliable. It is recommended to add two-stage filters after the rectifier bridge. The first stage uses a series differential mode inductor, PMS6045R6R8M0T, named PMS T core. It is a high-current inductor, 6045, 6.0×4.5mm, 6R8, with an inductance of 6.8μH, M tolerance 0, and special code T packaging. The second stage uses a parallel high-frequency CBB capacitor with a capacitance of 0.68μF to form an LC resonant filter tuned to around 150Hz to broaden and suppress the 3rd harmonic. At the same time, a common mode inductor, CMZ3225A-201T, is connected in series at the AC input. It is named CM common mode Z, with an impedance of 3225, 3.2×2.5mm, 201T, and an impedance of 200Ω. A 100MHz passive filter circuit can suppress common-mode harmonics and improve conducted emissions. The third harmonic of a 150W edge box is reduced from 2.5A to 0.8A, which is far below the GB17625.1 limit of 2.1A. The cost increase is less than 5 yuan and no modification to the control circuit is required.