Page 244 - Rashid, Power Electronics Handbook
P. 244
14 Inverters 233
FIGURE 14.9 The full-bridge VSI. Ideal waveforms for the unipolar SPWM (m a ¼ 0:8, m f ¼ 8): (a) carrier and modulating signals; (b) switch S 1þ
state; (c) switch S 2þ state; (d) ac output voltage; (e) ac output voltage spectrum; (f) ac output current; (g) dc current; (h) dc current spectrum; (i)
switch S 1þ current; (j) diode D 1þ current.
FIGURE 14.10 The half-bridge VSI. Ideal waveforms for the SHE technique: (a) ac output voltage for third, ®fth, and seventh harmonic elimination;
(b) spectrum of (a); (c) ac output voltage for fundamental control; (d) spectrum of (c).
