20/04/2017

Over voltage Protection of Semiconductor by Metal Oxide Varistor ( MOV )

Metal oxide Varistor (MOV)
  • The MOV is a non linear resistor.  
  • There are two metal particles oxide layers are separated by insulation. When voltage across MOV increases beyond its specific value, the metal oxide layer becomes conducting and current flow through it. 
  • The symbol and characteristics of MOV is shown in the figure A.
  • When voltage across MOV increases beyond point A, the conduction starts. 
  • The relation between voltage and current in the MOV is shown as below.

       I = kVα
      Where k is constant and value of α lies in the range of 30 to 40.


metal-oxide-varistor.png

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