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3 Phase Thyristor-SCR Bridge Firing Circuit

What is the name of a thyristor switching circuit that can be used in a 3 phase scr bridge to get a variable dc current control output. I need to find such a product if it exist so I may incorporate it into an existing thyristor ac to dc bridge rectifier.AC power suppy is 400v 50Hz, the expected DC output current is about 50A. Let me know how to get this "product". My regards to an experienced good answer.