a pulse width modulation control device for converting a first pwm signal for a two - level power conversion device to a second pwm signal for a three - level power conversion device , the three - level power conversion device including a switch , the second pwm signal driving the switch through a drive unit . the pwm control device includes an input terminal for receiving the first pwm signal for the two - level power conversion device , a conversion unit configured to convert the first pwm signal into the second pwm signal for the three - level power conversion device , and an output unit that outputs the second pwm signal to the drive unit .