What is the difference between an I-type 3-level module and a T-type 3-level module?

Major circuit configurations of 3-level inverters can be categorized in 2 groups, I-type and T-type as shown in the figure below. Fuji Electric has commercialized a T-type which applies two Reverse Blocking IGBTs (RB-IGBT) as a bi-directional switch. The loss can be made smaller compared with the conventional T-type where diode is connected in series with IGBT.

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