Diode-clamped multilevel inverter is a kind of power converter which can be used in high voltage and high power application field.  Its corresponding PWM control is studied extensively.  The paper presents a novel carrier-based PWM method to take advantage of all levels in the inverter even at low modulation indices.  The simulation results indicate that the novel PWM strategy increases device utilization and enables the inverter to switch at higher frequencies and low modulation indices.