Patent ID: 9331601
Filing Date: 2016-05-03
CPC Classification: H02M

Claim Text:
1. An inverter with power cell of dual structure, the inverter comprising: a first SMPS (Switching Mode Power Supply) connected to a first power cell region; a second SMPS connected to a second power cell region; and a controller connecting the first and second SMPSs; wherein: each phase of the inverter is formed by serially connecting a plurality of power cells formed with a plurality of stages operated by receiving power supplied from a phase shift transformer; and each of the plurality of power cells is mutually connected and comprises the first power cell region and the second power cell region configured to independently operate; wherein the first power cell region comprises: a first rectification unit comprising thyristors for preventing an inrush current and configured to perform rectification by receiving power from the phase shift transformer; a first capacitor connected to the first rectification unit and configured to generate a first DC link voltage by smoothing a voltage rectified by the first rectification unit; and a first inverter unit configured to generate a PWM voltage by switching in response to control by the first SMPS; wherein the second power cell region comprises: a second rectification unit comprising thyristors for preventing an inrush current and configured to perform rectification by receiving power from the phase shift transformer; a second capacitor connected to a second rectification unit and configured to generate a second DC link voltage by smoothing a voltage rectified by the second rectification unit; and a second inverter unit connected to the first inverter unit and configured to generate a PWM voltage by switching in response to control by the second SMPS; and wherein: the first inverter unit includes first and second inverter groups each formed with a plurality of unit inverters; the second inverter unit includes third and fourth inverter groups each formed with a plurality of unit inverters; and the first inverter group is connected to the third inverter group at a first contact point and the second inverter group is connected to the fourth inverter group at a second contact point.