The currents for both R and R-L loads are also shown in Figure 3 .

By varying A_r from 0 to A_c, the pulse width δ can be modified from 0° to 180° and the rms voltage V_o,rms from 0 to V_in. The harmonic content for different harmonics for different modulation indices is shown in Figure 4 .

Figure 2: Configuration of the single phase inverter

Figure 3: Currents and voltages in single phase DC-AC inverter for single PWM