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UCF DIAC (or PNPNP Diode)
Behave like two PNPN diodes connecting back to back
Can conduct in either direction
UCF SCR Switching Characteristics
DI9.0
DI1.0rrt
rrI1.0rrI
onV
dont
ont
rt
Gi
Ti
Tv
GMIGMI1.0
t
t
t
DI
offt
rrQ
DVDV1.0
Ti
TvGi
UCF SCR Specifications
DRMV RRMV TAVMI TRMSI - Maximum
Rating 12000V 12000V 1500A 2360A -
Turn-on
Time
Turn-off
Time /dtdiT /dtdvT rrQ Switching
Characteristics sont 14 sofft 1200 sA /100 sV /2000 C7000
DRMV – Repetitive peak off-state voltage RRMV
– Repetitive peak reverse voltage
TAVMI – Maximum average on-state current RRMSI
– Maximum rms on-state current
2
rrrrrr
ItQ – Reverse recovery Charge Part number – FT1500AU-240 (Mitsubishi)
12000V/1500A SCR Thyristor
UCF GTO Switching Characteristics
Tv
DV
dofft tailt
ft
DV9.0
DV1.0DI
DI9.0
DI1.0
rtdont
dtdiG
/1
MGI 1
MGI 11.0 MGI 21.0
MGI 2
TiTT iv ,
Gi
t
t
dtdiG
/2
0
0
Ti
TvG
i
UCF Symmetrical versus Asymmetrical GTOs
Type Blocking
Voltage
Example
(6000V GTOs) Applications
Asymmetrical GTO DRMRRM VV VVDRM 6000
VVRRM 22
For use in voltage
source inverters with
anti-parallel diodes.
Symmetrical GTO DRMRRM VV VVDRM 6000
VVRRM 6500
For use in current
source inverters.
DRMV - Maximum repetitive peak (forward) off-state voltage
RRMV - Maximum repetitive peak reverse voltage
UCF Device Comparison (1)
12000
10000
8000
SCR12000V/1500A
(Mitsubishi)
4500V/900A
(Mitsubishi)
6500V/1500A
(Mitsubishi)GTO/GCT
7500V/1650A
(Eupec)6500V/600A
(Eupec)
6000
4000
2000
1000 2000 3000 4000
3300V/1200A
(Eupec)
2500V/1800A
(Fuji)
1700V/3600A
(Eupec)
IGBT
SCR:
GTO/GCT:
IGBT:
27MVA
36MVA
6MVA
6000V/3000A
(ABB)
6500V/4200A
(ABB)
6000V/6000A
(Mitsubishi)
4800V
5000A
(Westcode)
5000 6000 I (A)
V (V)
00
Buck and Boost Converter Topologies
Implementation Using a Switch and a Diode Implementation Using Two Switches
Buck Vo/Vin = D (duty ratio)
Implementation Using a Switch and a Diode Implementation Using Two Switches
Boost Vo/Vin = 1/(1-D)
For bidirectional Buck/Boost applications, only topologies using two switches can be used.
Combined Bidirectional Topology
Buck Boost
Boost Buck
11
1
DV
V
low
high
11low
high
VD
V
Consistent since D2=1-D1.
Bidirectional
Example: Excitation from Low Voltage Side
When D1=0.6 and Vlow =40 V, we have Vhigh = 40/(1-0.6)=100 V.