Power Electronics and Motor Drive Systems

6.1. Single-Phase Half-Bridge Inverter

Fig. 6.2 shows the power circuit and the generated output voltage of a single-phase half-bridge inverter. The choice of the semiconductor switches for implementing this inverter depends on its power and switching requirements. The freewheeling diodes across the switches are included in the same power module as the switches. As shown in Fig. 6.2(d) the output voltage v_o is a two-level square-wave pulse (V_in/2 and −V_in/2). When S₁ or D₁ is conducting, the output voltage is v_o = V_in/2. When S₂ or D₂ is conducting, the output voltage is v_o = −V_in/2. The output voltage control can be achieved by varying the pulse widths of the output voltage through the gating signals of the semiconductor switches. When an increase ...