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.