The three-phase half-bridge converter is an extension of the single-phase half-bridge converter, see applet 'Single-Phase Half-Bridge with Transformer' for more details. While the output voltage of the single-phase half-bridge converter shows 2 pulses per mains period, there are 3 pulses in the case of the three-phase half-bridge converter. There is still just one single thyristor in the current path at any time.
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