Now, during the negative half cycle of the ac line voltage, both of the voltages labeledvs will be negative. Thus Dl will be cut off while D2 will conduct. The current conductedby D 2 will flow through R and back to the center tap. It follows that during the negativehalf-cycles while D2 conducts, the circuit behaves again as a half-wave rectifier. The importantpoint, however, is that the current through R always flows in the same direction, and thus v0will be unipolar, as indicated in Fig. 3.26(c). The output waveform shown is obtained
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