The power circuit diagram for two-quadrant type-B chopper, or type-D chopper, is shown in Fig.1.a. The output voltage $v_{0}=V_{s}$ when both $\mathrm{CH} 1$ and $\mathrm{CH} 2$ are on and $v_{0}=-V_{\mathrm{s}}$ when both choppers are off but both diodes $D 1$ and $D 2$ conduct. Average output voltage $V_{0}$ is positive …