Fixed-Frequency Boundary Control of Buck Converter With Second-Order Switching Surface
- 28 August 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 24 (9), 2193-2201
- https://doi.org/10.1109/tpel.2009.2022165
Abstract
This paper presents a fixed-frequency boundary control of buck converters. The method is based on integrating the concept of variable hysteresis into the boundary control technique with second-order switching surface. The switching frequency is maintained constant over a wide range of supply voltages and output loads. The method is based on using a frequency-to-voltage converter and comparing its output voltage with a reference voltage to control the width of the hysteresis in the boundary controller. It also combines the advantages of the boundary control that the converter can reach the steady state in two switching actions after large-signal disturbances. The basic operating principles, stability analysis, and design procedures will be given. The proposed control method has been successfully applied to control a 140 W, 24 V/12 V buck converter. The steady-state characteristics, including the switching frequency and output voltage ripple, at different input voltages and output loads with and without the proposed control method have been compared. The system responses under large-signal supply voltage and load disturbances will be discussed.Keywords
This publication has 24 references indexed in Scilit:
- Advanced Boundary Control of Inverters Using the Natural Switching Surface: Normalized Geometrical DerivationIEEE Transactions on Power Electronics, 2008
- Proximate Time-Optimal Digital Control for Synchronous Buck DC–DC ConvertersIEEE Transactions on Power Electronics, 2008
- An Optimal Control Method for Buck ConvertersUsing a Practical Capacitor ChargeBalance TechniqueIEEE Transactions on Power Electronics, 2008
- Continuous-Time Digital Controller for High-Frequency DC-DC ConvertersIEEE Transactions on Power Electronics, 2008
- Feedback Linearization of a Single-Phase Active Power Filter via Sliding Mode ControlIEEE Transactions on Power Electronics, 2008
- High-Order Switching Surface in Boundary Control of InvertersIEEE Transactions on Power Electronics, 2007
- A Comparative Study of Boundary Control With First- and Second-Order Switching Surfaces for Buck Converters Operating in DCMIEEE Transactions on Power Electronics, 2007
- A Comparative Study of the Boundary Control of Buck Converters Using First- and Second-Order Switching Surfaces -Part I: Continuous Conduction ModePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Selection of a curved switching surface for buck convertersIEEE Transactions on Power Electronics, 2006
- Derivation of a Second-Order Switching Surface in the Boundary Control of Buck ConvertersIEEE Power Electronics Letters, 2004