Lect2020091014EE429_529

Lect2020091014EE429_529 - ECE 529 Introduction to EMC...

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Unformatted text preview: ECE 529 Introduction to EMC University at Buffalo Dr. James J. Whalen Lecture 25 25Nov96 l2b 2 5 Oc.+06 \ 1 o:~ u7 20 0<:,+ 2arg C 6 fnfY1OI} ~ob (eM) vs .1. Dm + ~CI'r1 UsUCtlly One Is POn1IfL- c ur+ B tJ+ w h rd.. e Oom i/lede S -Do/fI1c&. Upcf) .-fft(5. 1 Common-mode 1 Differential- Differential-mode .1. _..,...-mode .. -component dominant - . .-- component-I 1 dominant component 1 dominant 1 1 I I I I I I I I I I i I 150 kHz 1 MHz 30 MHz s.u FIGURE9.13 Illustration of the important observation that one component of current may dominate the other over a particular frequency range of the conducted emission test. In order to reduce the total conducted emission, the dominant component must be reduced. 2 . . S - J To spectrum analyzer :;URE ~.1~ Schematic of a device to separate the common-mode and differential- ode conducted emission contributions. SPA r - - r.o< ~ ~ .:)1 __ 2Ve or 2Vo J t< . . . . .- - - 0 - - - - - , 1: 1 + L U;N Vp = Ve + V D P IJIJ>E 6N( 82 n 1: 1 LlSN Neu.(.ul e~c Switch DPDT To LlSN ~.IS- FIGURE 9.15 Photograph of the device of Fig. 9.14. 2 $ -2 1:1 r - - ~ . - - - - - c ) 1: 1 T N:t Yl-S .-kif M -tr H u!7 ~:.1 ., ut~..s Rc< ..b '0 . I f't') o-eJa n c.e r (Q ns' 1{lW-G .f I t I) is :L: 1. , ql\<. 5, de. NeeJ5 It Ce-: Ie. T C(I f'n f'1'"-- C ,-rev;)~ Cq ~ LC:9 C ~ Paul Used Two Tf'CIYl-.5k4/Y2i'LS f1lethod FDr Sepcercr,j{1}fj C (f) ri NY) i:l Jl. .-1.:..1- <: SOiL .2~J1 1: 1 T u t~ ~ ~+/b .1 : JZ .J: M p-edctl1 C.- \' ( w { \s b fY lft fttFi :r G. .t.: 2 To spectrum analyzer For SepQ(czj('!:J C (f) cf O/Y) ':J2 ~ LISN PU/J)E BN( + ~ Vp= Vc+ Vo so s:- LISN \'Jei.i(/{I (1NC + To LlSN :;URE ;.~~ Schematic of a device to separate the common-mode and differential- ode conducted emission contributions. 'b- FIGURE 9.15 Photograph of the device of Fig. 9.14. 25"'-~ ZS-2 SURFACE-MOUNT RFTransformers 4KHz to 1500M Hz 12.5 to 1800 ohms T-KK81 TT-KK81 lX rc Q FREQUENCY INSERTION lOSS * CAPO CASE c PRICE RATIO MHz DATA STYLE $ N (see RF/IF N Designer E hand- c 3dB 2 dB 1 dB book) Note T MODEL I QIy. NO. MHz MHz MHz Page B (1-9) N A* T1-lT-KK81 1 .05-200 .05-200 .08-1SO .2-80 14-8 KK81 ev 4.45 PRI:J E Tl-6T-KK81 1 .015-300 .015-300 .021-1SO .03-SO 14-8 KK81 ev 6.95 T2-lT-KK81 2 .07-200 .07-200 .1-100 .5-SO 14-8 KK81 ev 4.95 SEe T2.5-6T-KK81 2.5 .01-100 .01-100 .02-SO .50-20 14-8 KK81 ev 4.95 T3-lT-KK81 3 .05-2SO .05-200 .1-200 .5-70 14-8 KK81 ev 4.95 T4-1-KK81 4 .2-3SO .2-3SO .35-300 2-100 14-9 KK81 ev 3.25 T4-6T-KK81 4 .02-2SO .02-2SO .05-1 SO 0.1-100 14-9 KK81 ev 4.45 T5-lT-KK81 5 .3-300 .3-300 .6-200 5-100 14-9 KK81 ev 4.95 T8-lT-KK81 8 .3-140....
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This note was uploaded on 02/22/2011 for the course EE 529 taught by Professor Dr.j.j.whalen during the Fall '10 term at SUNY Buffalo.

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Lect2020091014EE429_529 - ECE 529 Introduction to EMC...

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