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This paper presents a new control technique for a digitally controlled buck converter. In the proposed method predictive PID control is employed in order to improve transient response and margin of stability. The application of the proposed method is demonstrated for the prototype buck converter. The frequency response is discussed and the transient response is examined to confirm the performance...
In this paper, comparative study of three algorithms of digital PI control, that is, conventional PI control, offset control and modified PI control, is presented. Conventional PI control is subjected to numerical error because the gain must be small in order to move zero of the control to output transfer function to low frequency. To prevent this undesired issue, authors have already proposed novel...
The fixed on-time with bottom detection control having ripple injection has become very attractive due to practical usage and realization of ceramic capacitor solution for output while keeping ultra fast transient response. This paper presents quantitative analysis by introducing averaging method in comparator operation for the transfer function. As a result, the frequency response characteristic...
This paper presents a new control method for H-bridge buck-boost converter regulated by single voltage feedback and dual feedforward controls. This converter has two pairs of the switch, one acts as a synchronous buck and another as a synchronous boost operations, and therefore is suited for battery powered applications to provide an output voltage that is below or above the input voltage. In order...
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 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...
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