Novel Shielding Technology and Interleaving Technology Realizes EMI CM Noise Suppression Base on Cascaded Power Module

In this article, a cascaded power module adopts novel shielding technology and interleaving technology to realize electromagnetic interference (EMI) common mode noise current suppression. The power module's first level adopts an LLC topological architecture converter, the second level adopts a buck topological architecture converter. To address the electromagnetic common mode noise problem, the first level LLC topological architecture converter's primary and secondary windings adopt shielding technology and cancellation technology. Analysis LLC topological architecture converter's transformer shielding structure model and noise current propagation path, researched and compared the LLC converter winding adopts novel shielding technology and cancellation technology transformer internal effective capacitance characteristics and electro-magnetic interference effect. The second-level buck topological architecture converter adopts a palar interleaving reverse coupled inductance, buck topological architecture converter's common mode noise model and propagation path model are established, studied, and analyzed the interleaving reverse coupled inductance winding effective capacitance. Experimental results show that a quarter brick cascaded power module with novel shielding technology and winding interleaving technology can effectively inhibit EMI common mode noise, reducing average common mode noise by 15 dB and peak common mode noise by 25 dB.