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This paper presents a constant frequency hysteretic PWM controlled buck converter. In order to have good transient responses for input voltage and load current changes, a new PWM control method with inherent derivative characteristics is proposed. The proposed PWM controller consists of a comparator, a simple RC network and operational amplifier, and it can be synchronized with an external clock signal...
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...
A new control method of a hysteretic PWM controller for all types of DC-to-DC converters are proposed. The triangular voltage obtained from a simple RC network connected between hysteretic comparator output and converter output is superimposed to the output voltage and fed to the hysteretic comparator as a feedback signal. Since the hysteretic PWM controller essentially has derivative characteristics...
A new control method for boost and buck-boost converters employing a hysteretic PWM controller is presented. The triangular voltage obtained from a simple RC network connected to an auxiliary winding of the inductor is superimposed to the output voltage and fed to a hysteretic comparator as a feedback signal. The presented control method provides no steady-state error voltage on the output and excellent...
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