A robust hysteretic PWM control method for switching converters

The hysteretic PWM control method is one of the fastest control technique for the dynamic response of switching power converters. This paper proposes a practical and robust hysteretic PWM control method by employing an additional capacitor in a comparator circuit. This additional capacitor has a role to enlarge the initial hysteretic window voltage just after turn-on and turn-off of the switching operation in order to ensure the stable switching action. As a result, no irregular switching action caused by incoming switching noises is realized at higher switching frequency without spoiling excellent dynamic performances.