Patent ID: 9419541
Filing Date: 2016-08-16
CPC Classification: H02M

Claim Text:
1. A multilevel inverter, the multilevel inverter comprising: a rectifier configured to provide a first rectifying voltage rectified by receiving a first three-phase voltage, a second rectifying voltage by receiving a second three-phase voltage, a third rectifying voltage by receiving a third three-phase voltage, and a fourth rectifying voltage by receiving a fourth three-phase voltage; a smoothing unit configured to provide voltages of different levels to corresponding nodes of a first node, a second node, a third node, a fourth node, and a fifth node by receiving the first to fourth rectifying voltages rectified by the rectifier; and an inverter unit comprising a plurality of switches configured to transmit voltages of three levels provided by the smoothing unit, wherein the smoothing unit comprises a first capacitor configured to smooth the first rectifying voltage, a second capacitor configured to smooth the second rectifying voltage, a third capacitor configured to smooth the third rectifying voltage, and a fourth capacitor configured to smooth the fourth rectifying voltage, wherein the first to fourth capacitors are serially-connected; wherein the plurality of switches comprises: wherein the first to third switch units are included in a first leg and the fourth to sixth switch units are included in a second leg, and an output voltage is synthesized using a potential difference between the first leg and the second leg.