When diodes D1 and D2 conduct, energy is fed back to the dc source and these diodes are known as feedback diodes . These diodes are also known ad freewheeling diodes . The current for purely inductive load is given by
(9)
Similarly, for the R-L load. The instantaneous load current is obtained as
(10)
The instantaneous voltage (vo) across R-L load and the instantaneous current (iL) through it are shown in Figure 7 .
Figure 4 : DC-AC inverter with inductive load |
Figure 5 : Load current in case 1 |
Figure 6 : Load current in case 2 |
Figure 7 : Instantaneous output voltage and load current through R-L load |