-
MOV
-
(surge) , , , , .
, . , (Surge Protection Device : SPD, Voltage Transient
Management System : VTMS, or Transient Voltage Surge Suppressor :
TVSS) .
-
Varistorvaristor variable resistor , VDR(Voltage-Dependent
Resistors) . Varistor .
varistor I-V , .
, (surge) , . , , . system transients lightning-induced
transients , , PC, , PDA ESD(electrostatic discharge) protection
varistor .
-
varistor varistor
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ZnO Varistor varistor . varistor , varistor .
-
ZnO varistor hexagonal unit cell . a=3.224[], c=5.19[]
c/a=1.60.
(1) ZnO ,(2) Bi2O3 (3), 3 . ZnO varistor , varistor , .
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Varistor 1
weighing
Marking&Packing
characterization
Encapsulation
Soldering
Metallization
Sintering
Pressing
Spray drying
Mixing&Miling
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Varistor 2weighing : ZnO Sb2O3, Bi2O3, Co3O4, NiO, Cr2O3 10mol%
1mol% .
Mixing : ZnO .
Milling : 1 . Bi2O3 . .
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Varistor 3Spray drying : 30~2 , , , . Spray drying (granule) , ,
, .
Pressing : 5, 7, 10, 14, 20mm . 25, 32, 40, 53, 60, 80mm .
Sintering : 1050~1300 30V/mm() 180V/mm~250V/mm() . .
Metallization : Ag(Ag 70~80%) paste .
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Varistor 4
Soldering : Sn:Pb = 63:37 Ag 1~2% 2305 . . . Encapsulation : , .
. . Characterization : , , , , . Marking : V1mA AC . . . Packing :
.
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ZnO
Jornal of the korean institute of electronic and electronic
material engineers
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1. 1.1 -ZnO attrition mill(+), 1um 70%- slurry ZnO
ball-mill(nylon ball) -spray dryer , 100mesh
-(38.5mm),(36.9mm),(140g), (8ton), (3.26~3.28g/cm2)-3500C 1130 burn
out -/ 1000C/hr 11300C 230 sintering -6000C10 -, lapping, - -()
2700C 230
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2. V-I dc tester (8/20us) 1uA~10kA 10 ( )
(3.6kV) 85% (3.06kV) detector(LCD-4) 8/20us 2.5kA,5kA,10kA
voltage divider 1150C 40C (maximum continous operating
voltage:MCOV) 1.05 (3.21kV) 300 , 4/10us 65kA,2 ,
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3. (5.78g/cm2) 95% 5% .3 A~E . A~E 11.89um,
13.57um,15.44um,11.92um, 12.47um C A,D . Bi2O3/Sb2O3 0.5,1,2 Bi2O3
, Sb2O3 .
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3. SEM ZnO , (Zn2.33Sb0.67O4), 1 EDAX . A,E Bi-rich .
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3. 2 I-V ( uA~ kA) 4 (), , . 11300C D,E>A>B>C . 30 , C
68 . 85% (MCOV) A,E .
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3. 5kA 12kV() D 5kA .
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3. 5 (115oC/3.213kV/300h) .
5 B,C,D C . .
D A Al2O3 1.5 Al2O3 .
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4. (5.78g/cm2) 95% 5% C ZnO , A,D . SEM ZnO ,
(Zn2.33Sb0.67O4),Bi-rich(Bi2O3), . 1130oC D,E>A>B>C 30 , C
68 . A,B,C,E C A,E , . . E , 1.4% 18 . E ZnO .
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CUTLER-HAMMER TVSS 220V 50kA TVSS
+
-
INR20D471
S20K150
Fuze
Fuze
diode
LED
R(1k5%)
R(1k5%)
diode
LED
GND
