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

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 , .

Varistor 1

weighing

Marking&Packing

characterization

Encapsulation

Soldering

Metallization

Sintering

Pressing

Spray drying

Mixing&Miling

Varistor 2weighing : ZnO Sb2O3, Bi2O3, Co3O4, NiO, Cr2O3 10mol% 1mol% .

Mixing : ZnO .

Milling : 1 . Bi2O3 . .

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 .

Varistor 4

Soldering : Sn:Pb = 63:37 Ag 1~2% 2305 . . . Encapsulation : , . . . Characterization : , , , , . Marking : V1mA AC . . . Packing : .

ZnO

Jornal of the korean institute of electronic and electronic material engineers

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

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 ,

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 .

3. SEM ZnO , (Zn2.33Sb0.67O4), 1 EDAX . A,E Bi-rich .

3. 2 I-V ( uA~ kA) 4 (), , . 11300C D,E>A>B>C . 30 , C 68 . 85% (MCOV) A,E .

3. 5kA 12kV() D 5kA .

3. 5 (115oC/3.213kV/300h) .

5 B,C,D C . .

D A Al2O3 1.5 Al2O3 .

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 .

CUTLER-HAMMER TVSS 220V 50kA TVSS

+

-

INR20D471

S20K150

Fuze

Fuze

diode

LED

R(1k5%)

R(1k5%)

diode

LED

GND