A METHOD FOR CONTROLLING OUTPUT VOLTAGE OF MULTI-LEVEL INVERTER

摘要

The present invention relates to a multilevel inverter and its control method using a phase shift technique.;To this end, the present invention provides a plurality of output isolation transformers 40 in which the primary sides of the input power supply 10 are all connected in parallel and the secondary sides are all connected in series for a multi level; A switch unit having a common arm switch 20 and an H-bridge switch 30 to reduce the number of switches of the inverter; A multilevel inverter and a phase shift control method using a phase shift technique including a control unit having a phase shift controller for generating a control signal of a switch unit by a phase shift technique are featured.;Therefore, the present invention can reduce the number of drive of the inverter switch to reduce the switching loss of the inverter and the conversion efficiency of the inverter itself, as well as the utilization of each transformer is easy to design the transformer, the production cost by using the same transformer multiple By using this inexpensive and common arm, the number of switches is reduced compared to the conventional method, and there is an economic effect that the manufacturing cost is low.;Inverter, multilevel, phase shift, common arm