Scrytriac
Transcript of Scrytriac
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TIRISTORES
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INTRODUCCIÓN
Los tiristores ( a veces llamados SCR, semiconductor-controlled rectifiers, o rectificadores controlados de silicio) pertenecen a uno de los tipos mas antiguos de dispositivos de potencia de estado sólido y todavía tienen la capacidad más alta de manejo de potencia (1957, en los laboratorios de investigación de General Electric).
Tienen una construcción única de cuatro capas y son interruptores de bloqueo que se encienden por la terminal (compuerta) de control, pero no se apagan por la compuerta.
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TIRISTORES
• Tiristor de Control de Fase; SCR.• Fast – Switching Thyristor; High Speed.• GTO; Gate Turn Off Thyristor.• TRIAC; Bidirectional Triode Thyristor.• Reverse – Conducting Thyristor; RCT´s.• Static Induction Thyristor; SITH´s.• Light Activated Silicon Controlled rectifiers; LASCR´s.• FET – Controlled Thyristor.
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SCR: ESTRUCTURA Y SÍMBOLO
A N O D O
M e t a l i z a d o
N + N +
P U E R T AC A T O D O
M e t a l i z a d o A i s l a n t e
P
N -
P +
K
A
G
P
1019
/cm3
1019
/cm3
1017
/cm3
1014
/cm3
1017
/cm3
1019
/cm3
10 u
30 - 100 u
50 - 100 u
30 - 50 u
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SCR: ESTRUCTURA Y SÍMBOLO
P
N
P
N
K
G
A
G
A
K
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SCR: ESTRUCTURA
P
N
P
N
K
G
A
J 1
J 2
J 3
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SCR: POLARIZACIÓN DIRECTA
P
N
P
N
K
A
J 1
J 2
J 3
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SCR: POLARIZACIÓN DIRECTA
P
N
P
N
K
A
J 1
J 2
J 3
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SCR: POLARIZACIÓN DIRECTA
P
N
P
N
K
A
J 1
J 2
J 3
A
J 1
J 2
J 3
K
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SCR: ACTIVADO POR COMPUERTA
P
N
P
N
K
A
J 1
J 2
J 3
G
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SCR: ACTIVADO POR COMPUERTA
P
N
P
N
K
A
J 1
J 2
J 3
G
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SCR: ACTIVADO POR COMPUERTA
P
N
P
N
K
A
J 1
J 2
J 3
G
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SCR: ACTIVADO POR COMPUERTA
P
N
P
N
K
A
J 1
J 2
J 3
G
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SCR: ACTIVADO POR COMPUERTA
G
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SCR: ACTIVADO POR COMPUERTA
G
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SCR: ACTIVADO POR COMPUERTA
G
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SCR: ACTIVADO POR COMPUERTA
G
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SCR: PROTECCIÓN CONTRA di/dt
P
N
P
N
K
G
A
J 1
J 2
J 3
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SCR: ESTRUCTURA DE LA COMPUERTA
G
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SCR: ESTRUCTURA DE LA COMPUERTA
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SCR: MODELO CON DOS TRANSISTORES
P
N
P
N
K
G
A
J 1
J 2
J 3
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SCR: MODELO CON DOS TRANSISTORES
P
N
P
N
K
G
A
J 1
J 2
J 3
G
A
K
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SCR: MODELO CON DOS TRANSISTORES EN ACTIVADO
G
A
K
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SCR: MODELO CON DOS TRANSISTORES EN ACTIVADO
G
A
K
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SCR: MODELO CON DOS TRANSISTORES EN ACTIVADO
G
A
K
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SCR: MODELO CON DOS TRANSISTORES EN ACTIVADO
G
A
K
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SCR: MODELO CON DOS TRANSISTORES EN ACTIVADO
G
A
K
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SCR: POLARIZACIÓN INVERSA
P
N
P
N
K
A
J 1
J 2
J 3
G
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SCR: POLARIZACIÓN INVERSA
P
N
P
N
K
A
J 1
J 2
J 3
G
K
J 3
J 2
J 1
A
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SCR: CURVA CARACTERÍSTA EN ESTADO ESTABLE
V B D
I f d
V D
I f rV B R
I A K
V A K
I g = 0
I H
I L
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SCR: CURVA CARACTERÍSTA EN ESTADO ESTABLE
VBD
Ifd
VD
IfrVBR
IAK
VAK
I g 1
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SCR: CURVA CARACTERÍSTA EN ESTADO ESTABLE
VBD
Ifd
VD
IfrVBR
IAK
VAK
I g 2
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SCR: CURVA CARACTERÍSTA EN ESTADO ESTABLE
VBD
VBR
IAK
VAK
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SCR: CURVA CARACTERÍSTA EN ESTADO TRANSITORIO
VAK
t
t
IAK
Irr
trr
Qrr
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MÉTODOS DE DISPARO
Efecto transistor:VA > VK y Ig
A
K
G
ig
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MÉTODOS DE DISPARO
Temperatura:
A
K
G
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MÉTODOS DE DISPARO
Ondas Electromagnéticas:
A
K
G
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MÉTODOS DE DISPARO
Sobrevoltaje:
A
K
G
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MÉTODOS DE DISPARO
Sobrevoltaje:
A
K
G
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MÉTODOS DE DISPARO
G
A
K
Cj
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MÉTODOS DE DISPARO
Variaciones de voltaje en el tiempo:
A
K
G
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MÉTODOS DE DISPARO
Ruido en la gate:
A
K
G
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SCR EN AC
Conmutación natural:
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SCR EN AC
Conmutación natural:
Vo
SC1
wt
wt
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SCR EN DC
Conmutación forzada:
S W 1
S W 2
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SCR EN DC
Conmutación forzada:
Vo
S C 21
wt
wt
S C 11
wt
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SCR: CURVA VOLTAJE CORRIENTE DE GATE
Vfg
Ifg
Ifg mx
Vfg mx
Pg mx
Ciclo de trabajo = 0.1
Area de disparo seguro
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TRIAC: ESTRUCTURA Y SÍMBOLO
N 4 N 2
P U E R T A T 1
M e t a l i z a d o A i s l a n t e
P 2
N 1
P 1
T 2
N 3
M e t a l i z a d o
T 1
T 2
G
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TRIAC
La conducción bidireccional del TRIAC se debe a su estructura de capas, que funcionalmente equivale a dos tiristores en antiparalelo P1N1P2N2 y P2N1P1N3.
2211:012NPNPV TT
3112:012NPNPV TT
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TRIAC: CURVA CARACTERÍSTICA EN ESTADO ESTABLE
V B D
I f d
V D
IT2T1
VT2T1
-V B RI f r
-V RI H
I L
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TRIAC: MÉTODOS DE DISPARO
Disparo en el primer cuadrante:
Disparo en el segundo cuadrante:
0:012
GTT IV
2211 NPNP
0:012
GTT IV
2211 NPNP
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TRIAC: MÉTODOS DE DISPARO
Disparo en el tercer cuadrante:
Disparo en el segundo cuadrante:
0:012
GTT IV
3112 NPNP
0:012
GTT IV
3112 NPNP
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TRIAC: MÉTODOS DE DISPARO
Polarización IG Sensibilidad Modo Cuadrante
DirectaT2 +T1 -
IG + Muy Alta I + I
IG - Buena I - II
InversaT2 -T1 +
IG + Mala III + IV
IG - Buena III - III