Electrotechnical Systems

120 Electrotechnical Systems

three segments: 0.12—0.125 s, 0.125—0.14 s, and 0.14—0.145 s. On the rst one,

the phase A current I

a

< 0, and the modulating signal (MS), crossing 0, becomes >0.

The current ows from the load to the rectier terminal “+” either through antiparal-

lel diodes D1, D2 or through T3 (and the neutral clamping diode) to the neutral N. On

the second segment, both I_A and MS > 0. The current ows either from the source

terminal “+” through T1, T2, or from the point N through the neutral clamping diode

and T2. On the third segment, I_A > 0 and MS < 0. The current ows either from the

source terminal “−” through diodes D3