Electronica 3 [Compatibility Mode]
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Transcript of Electronica 3 [Compatibility Mode]
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Dispozitive electronice
Tema 3
Teoria diodei. Circuitecu diode
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Simbolul diodei
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Caracteristica diodei
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Parametrii caracteristici
VRRM – tensiunea inversă maximă repetată
VR (VDC) – tensiunea inversă maximă în CC
VF – tensiune directă maximă
IF(AV)
– curentul direct maxim (mediu)
IFSM – curentul maxim de vârf
PD – puterea disipată
TJ – temperatura de lucru a joncţiunii
TSTG – temperatura de depozitare
R(θ) – rezistenţa termicăIR – curentul invers maxim
CJ – capacitatea joncţiunii
trr – timpul de comutare
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C
AT
A
L
O
AG
E
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Prima aproximaţie. Dioda ideală
1010
1
10
10 10 100
0 10 0
S
S
D
V I mA
k
U V
P V mA mW
P V mA mW
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A doua aproximaţie
1
10 0, 79, 3
1
9,3
9, 3 9, 3 86,5
0, 7 9, 3 6,5
10 9, 3100 7,5%
9,3
S L
S
D
U
V V I mA
k
U IR V
P V mA mW
P V mA mW
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A treia aproximaţie
1
2
10 0, 79,298
1 0, 23
9,298
9, 298 9, 298 86, 45
0, 702 9, 298 6, 53
10 9,298100 7,55%
9,298
9,3 9,298100 0,02%
9,298
S L
S
D
U
U
V V I mA
k
U IR V
P V mA mW
P V mA mW
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Ualim Eroare relativă
3,5 V 20%
7 V 10%
14 V 5%
28 V 2,5%
70 V 1%
RL /rD Eroare relativă
5 20%
10 10%
20 5%
40 2,5%
100 1%
Eroarea făcută în primaaproximaţie
Eroarea făcută în a
doua aproximaţie
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Dreapta de sarcină. Rezistenţa dinamică şi statică
75 5
D S
D
S S
R R
U U IR
U U I
R R
U V I A
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Redresorul monoalternanţă
max
ef
U U
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Redresorul bialternanţă cu priză mediană
'
max max2
ef
U U U
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Aplicatie
• Sa se determine caderea de tensiune pe al doilea invelisal transformatorului, daca rata de transformare este de
5:1, iar valoarea tensiunii sursei este de 120V la 60Hz
pentru un redresor bialternanta cu priza mediana.
• U sinusoidal
• U monoalternanta
• Vp1 =120V/0,707=170V• Vp2 =170V/5=34V
• Ip=17V/1kΩ=17mA
max
2ef
U U
max
ef
U U
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Redresorul bialternanţă în punte
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max
max
max
1.
2. 0, 7
3. 0, 72
S
R
CC
CC
RCC
R C
I V
C
U U
U U n V
V U U n V
Redresor cu filtru capacitiv
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AplicaţieSă se determine tensiunea efectivă de pe rezistenţa de sarcină a unuiredresor bialternanţă în punte cu filtru capacitiv, cunoscândtensiunea de intrare efectivă 12,7 V, rezistenţa de sarcină 1 k ,capacitatea condensatorului 470 μF.
Tensiunea maximă la intrarea redresorului:
max 2 18ef U U V
Prima aproximaţie
18CC
U V
A doua aproximaţie18 16,6
18 2.0, 7 16, 6 8, 4%16,6
CC U V V V
A treia aproximaţie
16,616, 6 353
100.470
0,35316, 6 16,5
2
S R
CC
mA I mA U mV
F
U V
În absenţa filtrului
max2
11,4ccU
U V
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Limitatoare de tensiune
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Circuite pentru refacerea componentei continue
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Dublorul de tensiune
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Multiplicator de tensiune complet
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Multiplicatorul triplu de tensiune