A Novel Soft-Switching Synchronous Buck Converter for Portable Applications

Figure 5

Experimental voltage and current waveforms: (a) main switch $\text{S}$: $V_{\text{S}}$, $I_{\text{S}}$ (V: 5 V/div, I: 10 A/div, time: 0.2 μs/div); (b) synchronous switch ${\text{S}}_1$: $V_{\text{S}1}$, $I_{\text{S}1}$ (V: 5 V/div, I: 10 A/div, time: 0. 2 μs/div); (c) diode $D_{\text{S}1}$ and capacitor $C_{\text{r}}$: $V_{D\text{S}1}$, $V_{C\text{r}}$ (V: 5 V/div, I: 2 V/div, time: 0. 2 μs/div); (d) capacitor $C_{\text{b}}$ and diode $D_{\text{S}3}$: $V_{C\text{b}}$, $V_{D\text{S3}}$ (V: 5 V/div, I: 2 V/div, time: 0.2 μs/div).

(a)

(b)

(c)

(d)