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

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Presentation transcript:

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 2

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 3 SMPS DISTURBANCES

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

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 6 COMMON MODE INTERFERENCE

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

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 9

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 10 DIFFERENTIAL MODE INTERFERENCE

Prof R T KennedyEMC & COMPLIANCE ENGINEERING  5 MHz

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 13 DIFFERENTIAL MODE FILTER

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 15

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

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

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

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

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 21 PARASITIC CAPACITANCE

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

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 23

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 24

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 25

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

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

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 

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 

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