Specifications

EVALPFC-3kW-IPZ65R019C7

Application Note AN 2014-06

V1.1 January 2015

10.2 Conductive EMI Test

EMI is a very important quality factor for a power supply. The EMI has to consider the whole SMPS and is

splitted into radiated and conductive EMI consideration. For the described evaluation PFC board, it is more

important to investigate on the conducted EMI-behavior since a PFC is the input stage of any SMPS with

input power above 75 watts or greater.

Figure 12: Conductive EMI Measurement of the Board with resistive load

Base on the EN55022 standard, the line filter can be modified as below in order to improve the EMI quality

further more:

 Change the Y1-capacitors C17/C18 from value 2.2nF to 1.1nF

 Change the Y1-capacitors C19/C20 from value 2.2nF to 3.3nF

 Change the X2-capacitor C23 from value 1uF to 1.5uF