10 April 2017

Protection of Semiconductor Device against Overcurrent By Fuse

  • The fault current flows through power converter due to short circuit, surge current or overload condition. 
  • The semiconductor device may damage due  due to fault current and temperature rise. 
  • The power diodes and SCRs are protected by using fuse in series with supply system is shown in the figure A. 
  • The fast acting fuse is now used in place of glass fuse generally. 
  • The SCR is protected against fault current by using series fuse connection as shown in the figure B.
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The following are advantages of connected of fuse in series with the SCR.
  • There is co – ordination between semiconductor device and fuse is done.
  • If there is fault in the SCR, it is isolated from the circuit without disturbing other SCRs. 

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