AN2316 - Application Note

EMC Precompliance Measurement

11/24

2.1

Electrical Conditions

●

●

Motor type = Asynchronous with capacitor

●

●

Motor current =1.5A

The on-board EMC filter is not optimized for every kind of load, so users need to consider

that the included filter might be inadequate for certain applications.

A double-filter stage (see

Figure 5) is required to obtain good EMC results (acceptable EMC

level) without the included filter (T2, C16, and C17), use the recommended filter mentioned

in

Figure 5. The measured results are shown in Figure 6 and Figure 7 on page 12.

Note:

In order for the filter to be effective, the motor case must be connected to the earth-ground.

Figure 5.

EMC Double-Filter Stage Schematic

2.2

EMC Double-Filter Bill of Materials

T1 = 10mH common mode filter (to be designed in terms of current, depending on the final

load to be driven). For this application, the type used is TDK 103Y1R2X3X.

T2 = 111µH common mode filter (to be designed in terms of current, depending on the final

load to be driven).

Mains

Mains

EARTH GROUND

P

N

T1

Common mode filter 10mH

1

5

4

8

T2

Common mode filter 111µH

1

5

4

8

C1

0.47µF 230VAC

X2

C2

2.2nF 400VAC

2.2nF 400VAC

Y2

C3

Y2

To the AC-Chopper

Circuit

AI12290