pe dc – dc 1 10th mar 2015
TRANSCRIPT
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8/18/2019 Pe Dc – Dc 1 10th Mar 2015
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DC – DC Converter
Choppers
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AC Power Vs. DC Power
1. Power factor in AC Power.2. More Transmission drop in AC Power.3. Renewable ener! so"rces are mostl! DC
so"rce. #eeds to convert to AC for AC powerapplication.
$. Micro%rid applications.
&. 'se of electronic e("ipment. DC can be dire"sed w)ere as AC needs to be converted froAC to DC.
*. Direct solar panel DC o"tp"t can be "sed tooperate t)e )o"se)old appliances.
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Applications (DC House)
Unity power factor application
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Micro%rid Applications
LocalLoad
LocalGenerator
(Renewableenergysource)
DC - AC
Conertr
AC !ationalGrid
DC Grid
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DC Power +o"rces
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"ub#arine power syste#s$ "pacecrapower syste#s$Auto#obile applications$ DC #otor driAll electronic e%uip#ent li&e'
ersonal co#puters$ *ce e%uip#entLaptop co#puters$ +eleco# e%uip#enAudio-,isual syste#s$ Do#estic appliaRailway signaling
DC –DC power s"ppl!Applications
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T)e converterprod"ces a re"lo"tp"t voltae, )a manit"de -an
possibl! polarit!di/ers from t)e Voltae.
DC . DC Conerter (De/nition)
+tep%down -"c DC%DC Converter
"c % oost DC%DC Converter
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DC – DC Converter re("irem
1. "tp"t voltae ad4"stabilit!.2. ver c"rrent protection.3. +)ort circ"it protection.$. "tp"t side over voltae
protection.&. 0np"t side over voltaeprotection.
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asic DC – DC C)opper
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T+1 5 T# 6 T+2 5 T7
8 T77
+witc)in 7re(D"t! c!cle D is de9
is e("al to -D 5 and -1%D
DC – DC Converter
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Aerage DC output oltage across the load ,
gien by'
V'T is alwa!s less t)an V0#
"c C)opper
DC – DC Converter -"cC)opper
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R1" Co#ponent of output oltage across th
load ,U+(R1") is gien by'
:nowin VDC-Ave and VRM+ , 77 and R7 ca
be calc"lated
"c C)opper
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A meas"re for o"tp"t wave s)apedeviation, to re("ired o"tp"t wavs)ape -Constant DC val"e;
7orm 7actor < Ripple 7actor
2324345 U1 Rao
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6
At an! D val"e, t)at is at an! V'T, =>cienc
=("ivalent Resistance of "c C)opper ts"ppl! is a
variable resistance 5 R0# 5
"c C)opper -Resistive oa
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Power 0np"t P0#
5
"c C)opper % =>cienc!
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Actual loss factors in the circuit are'4 7orward ,oltage drop of 8n9 switch "4 (
cienc!
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"c C)opper – BP Anal!sis
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"c C)opper – Compon
7unda#ental fre%uency 6 f 6 "wifre%uency
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f + is switc)in fre("enc! and can be
)i), so can be 9ltered b! "sin a owPass 7ilter.
#ote; 5 2Ef and f is switc)infre("enc!, t)"s 9rst lowest )armonic is
e("al to switc)in fre("enc!.
Har#onic "pectru# - LH