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Power Electronic Riddle No.7 - Latching and Holding Current
Is it possible to make latching and holding current equal?
Author : Abhishek Kumar - From: India
 
#1
Sun, April 24th, 2011 - 16:48
Latching current (IL) is the minimum principal current required to maintain the Thyristor in the on state immediately after the switching from off state to on state has occurred and the triggering signal has been removed.
Latching current can best be understood by relating to the “pick-up” or “pull-in” level of a mechanical relay.
Holding current (IH) is the minimum principal current required to maintain the Thyristor in the on state. Holding current can best be understood by relating it to the “dropout” or “must release” level of a mechanical relay.
Therefore latching current may not equal to holding current inherently. Holding current will always be less than latching. However, the more sensitive the device, the closer the holding current value approaches its latching current value.
Holding current is independent of gating and latching, but the device must be fully latched on before a holding current limit can be determined.




 
Author : Hamid - From: Iran
 
#2
Wed, March 6th, 2013 - 12:14
Laching current means'the current in which the thiristor start to conduct 
Author : Mohd - From: India
 
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