862510.fig.004a
(a)
862510.fig.004b
(b)
862510.fig.004c
(c)
862510.fig.004d
(d)
Figure 4: Simulated voltage and current waveforms: (a) main switch S: VS, IS; (b) synchronous switch S1: VS1, IS1; (c) diode DS1 and capacitor Cr; (d) capacitor Cb and diode DS3.