General information about AC/DC converters can be found at the AC/DC converter concept
This is a two pulse Graetz thyristor rectifier bridge. The
firing signal fire_p are connected with thyristor
thyristor_p1 and thyristor_n2. The firing
signal fire_n are connected with thyristor
thyristor_p2 and thyristor_n1. See
example
Examples.ACDC.RectifierCenterTap2Pulse.