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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...
A derivative PWM control method with constant switching frequency strong against incoming switching noise is proposed. The triangular voltage obtained from a simple RC network as a comparator input is employed to determine the duty ratio and an external clock signal is used to fix the switching frequency. Applying the proposed method to the buck converter, excellent dynamic performances and stable...
This paper presents a novel fast simulation algorithm for the frequency analysis of switching power converters. Numerical Fourier Transform is employed to obtain fast results. The proposed algorithm is applicable to any circuits including self-oscillating circuits such as hysteretic PWM converters. A circuit simulator using the proposed algorithm is implemented and demonstrated with a hysteretic PWM...
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 multi-phase dc-to-dc converter controlled by hysteretic PWM method is presented in this paper. An and-gated logic circuit is employed for the synchronization and its operating principle is described. A 5 V to 1.5 V prototype buck converter of two-phase is implemented for a POL power supply. From the experiments, it is confirmed that the proposed method can be well synchronized, and an excellent...
DC-DC converters with a novel hysteretic PWM controller are presented. A novel feedback network is proposed which behaves as a PID controller. Fast transient response and no steady state error of the output voltage are achieved. Steady state and dynamic analysis are performed and confirmed by experimental results for a 5 V to 1.5 V prototype buck converter. As a result, no steady state error on the...
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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