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forced commutation circuit

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conchunchun

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forced commutation

Anyone has any idea bout forced commutation for SCR? I have designed a zero-crossing detector+ speed controller for scr to control separately excited dc motor. I use TCA785. Please help me on design forced commutation of SCR. Which technique should I use? External pulse circuit is more appreciated. Thanks
 

scr forced commutation

Please see attached PDF as a reference
 

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