- is also known as an inverter. A singlephase transistor inverter is shown in the figure.
When MOSFETs M1 and M2 are turned on by applying gate voltages, the dc supply voltage Vs appears across the load and the instantaneous output voltage is Vo = +Vs. Similarly, when MOSFETs M3 and M4 are turned on by applying gate voltages, the dc supply voltage VS appears across the load in the opposite direction. That is, the instantaneous output voltage is Vo = −Vs. If transistors M1 and M2 conduct for one half of a period and M3 and M4 conduct for the other half, the output voltage is of the alternating form. The rms value of the output voltage becomes Vo(rms) = VS. However, the output voltage contains harmonics which could be filtered out before supplying to the load.
