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Control of Converters Having Integrated Capacitor Blocked Transistor Cells

ICBT cells
Fig. 1. Each ICBT cell operates as a single switching device
  Converters having Integrated Capacitor Blocked Transistor (ICBT) cells provide a new method to transfer high power in medium voltage systems. Each ICBT cell includes a pair of switching devices and a cell capacitor. An ICBT-based phase leg has two converter arms, each of which includes one or more series-connected ICBT cells. An ICBT-based phase leg with two cells per arm is shown in Fig. 1. Each ICBT cell operates as a single switching device and an ICBT-based converter arm operates as a high-voltage device. In this way, ICBT-based converters enable direct power flow from input to output, are capable of both dc and ac operation modes, have little additional losses, and do not require high cell capacitance values.

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