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In a typical high-voltage application, common-mode(CM) noise dominates the EMI filter size. The origin of the CM noise is the parasitic capacitance of the switching node to the chassis. This results in voltage swings on the chassis that are synched with the converter's switching transitions (PWM). The concept of Discrete-Time Canceller based Active EMI Filter (DCAEF) is to use the timing information of the PWM signals to apply corresponding reverse voltage swings to the chassis which helps in effectively canceling the voltage swings and thus reducing the common mode EMI
