Need expert help for Regulator DC Power Supply using THRISTOR.

Hi expert,

I am new in THYRISTOR gating controlling. I need same expert to advise or guide me to

solve the gating controlling.

My circuit as per attachment, My question are: -

1.) Have any circuit to the 4 nos. thyristor gate ????

2.) I need output 0 to 15 v (max) and 50 amp (max).

Thanks.

Best Regards

liew nelson.