Reducing the Common-Mode (CM) Noise in DC-DC Converters by the CM Voltage Cancellation Method

For the conventional common-mode (CM) noise cancellation method such as passive cancellation and symmetry circuit, a CM noise current cancellation branch is introduced to reduce the CM noise in DC-DC converters. As the duality, this chapter proposes the CM voltage cancellation (CMVC) method for reducing the CM noise, and its applications in the basic non-isolated and isolated DC-DC converters and practical considerations are presented. Finally, the experimental results are provided to verify the effectiveness of the CMVC method in a buck converter and a half-bridge LLC resonant converter.