1. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 1 EET 422 EMC & COMPLIANCE ENGINEERING

2. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 2

3. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 3 SMPS DISTURBANCES

4. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 4 FLYBACK SMPS CCM DCM

5. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 5 ZsZs ~ C noise

6. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 6 COMMON MODE INTERFERENCE

7. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 7 L: cable INDUCTANCE 3  30 MHz

8. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 8 COMMON MODE FILTER: INSERTION LOSS

9. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 9

10. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 10 DIFFERENTIAL MODE INTERFERENCE

11. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 11 0.5  5 MHz

12. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 12 DIFFERENTIAL MODE FILTER: INSERTION LOSS

13. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 13 DIFFERENTIAL MODE FILTER

14. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 14 CABLE INDUCTANCE REDUCES FILTER EFFECTIVENESS RADIATE

15. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 15

16. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 16 10 mV : Excellent 100 mV : Average 1 V : Excessive

17. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 17 FIXES !!!! R gat e COMPROMISE: EMI & EFFICIENCY

18. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 18 FIXES !!!! SNUBBER

19. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 19 FIXES !!!! SNUBBER

20. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 20 FIXES !!!! SNUBBER

21. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 21 PARASITIC CAPACITANCE

22. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 22 FIXES !!!! FARADAY SHIELD

23. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 23

24. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 24

25. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 25

26. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 26 ‘INTRINSIC’ DIFFERENTIAL MODE NOISE I DS I DS(AC) o o DM noise normally due to SMPS pulsating current ac component LISN presents 100  impedance (2 series 50  if capacitor esl significant then HF DM  source RECTIFIER ‘ON’  HIGHER DM X C  2 k  @ 1 MHz X C  2 M  @ 10 kHz

27. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 27 ‘INTRINSIC’ DIFFERENTIAL MODE NOISE I DS I DS(AC) o o DM noise normally due to SMPS pulsating current ac component LISN presents 100  impedance (2 series 50  if X C << 100  most DM diverted from LISN X C  2 k  @ 1 MHz X C  2 M  @ 10 kHz

28. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 28 COMMON MODE NOISE: MOSFET TURNING ON X C  2 k  @ 1 MHz X C  2 M  @ 10 kHz I DS I DS(AC) V DS o o o CM noise normally due to SMPS parasitic capacitance and LISN presents 25  impedance (2 parallel 50 

29. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 29 COMMON MODE NOISE: MOSFET TURNING OFF X C  2 k  @ 1 MHz X C  2 M  @ 10 kHz I DS I DS(AC) V DS o o o CM noise normally due to SMPS parasitic capacitance and LISN presents 25  impedance (2 parallel 50 

30. Prof R T KennedyEMC & COMPLIANCE ENGINEERING 30 COMMON MODE NOISE: PARASITIC CAPACITANCE CM noise normally due to SMPS parasitic capacitance and LISN presents 25  impedance (2 parallel 50  X C  2 k  @ 1 MHz X C  2 M  @ 10 kHz I DS I DS(AC) V DS o o o