Figure 2-6. Current (I_tr3) and voltage (V_tr3) of the transformer in PRC structure III. (a) voltage and current vectors (b) current and voltage waveforms ..... 30 Figure 2-7. Current (I_tr2) and voltage (V_tr2) of the transformer in PRC structure II. (a) voltage and current vectors (b) current and voltage waveforms ..... 31 Figure 2-8.