DER-53

105C Dual Output Cook top Power Supply

April 20, 2005

Page 25 of 27

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12 Conducted EMI

A conducted EMI scan of the prototype was taken to determine the effectiveness of the

input filter, transformer construction and layout. The following plots show the Peak

performance of the converter against quasi-peak (QP) and average (AVG) limits of

EN55022 Class B. Both scans were taken at 115VAC/60Hz input with peak load applied

to both output rails.

Figure 28 - Conducted EMI, Maximum Steady State Load (Line)

Figure 29 - Conducted EMI, Maximum Steady State Load (Neutral)

Since the peak scan is below the average limits, it is expected that the QP scans would

have greater than 10db of margin below the limits.