Converters with Integrated Capacitor-Blocked Transistor (ICBT) cells have modularity, scalability, low cell ca-pacitor voltage ripple, and are promising in medium voltage, high power applications. A closed-loop control is essential to regulate the cell voltages and ensure the safe operation of switching devices, cell capacitors and other components. In this study, the relation-ship between the gate signal timings and the cell capacitor voltages are analyzed, and a cell capacitor voltage control is proposed and experimentally verified.