3 Phase Inverter Bridge. A basic three phase inverter is a six step bridge inverter. In inverter terminology a step is defined as a change in the firing from one thyristor to the next thyristor in a proper sequence.
Another common variation adding a third leg to the bridge creates a three phase inverter. A basic three phase inverter is a six step bridge inverter. The three phase inverter is the core of any ac motor drive.
In each case the effective resistance across the source is 2r as shown 15 5.
Voltage and current ratings of inverter switches. The circuit below shows a 3 phase inverter inverter circuit stage using h bridge mosfets configuration which receives the phase shifted pwms from the above stage and converts them into corresponding high voltage ac outputs for operating the connected 3 phase load normally this would be a 3 phase motor. For these three modes of operation. Fig 15 5 modes for the three phase bridge inverter.
