scr gate calculation

[abdussaboor]

Hi
How to calculate gate current of scr when i have load current of 0.02amps and voltage drop of 2v.

 

[Hero999]

It's a trick question.

An SCR might not even switch on and stay on at 20mA and it will certainly drop less than 2V, at that low current.

SCRs don't work like BJTs. The gate current doesn't need to be on continuously. You need a small gate current, for a short length of time to trigger the SCR and it will remain on until the current falls below the minimum holding current.

A schematic would help.