Phase-shift interleaving control of variable-phase switched-capacitor converters

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Comments on "Design and analysis of switched-capacitor-based step-up resonant converters"

Author name used in this publication: Chi K. Tse2005-2006 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

On Energy Efficiency of Switched-Capacitor Converters

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Comments on "Unified analysis of switched-capacitor resonant converters"

Author name used in this publication: Henry S. H. ChungAuthor name used in this publication: Chi K. Tse2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Optimal Control of Nonlinear Switched Systems: Computational Methods and Applications

A switched system is a dynamic system that operates by switching between different subsystems or modes. Such systems exhibit both continuous and discrete characteristics—a dual nature that makes designing effective control policies a challenging task. The purpose of this paper is to review some of the latest computational techniques for generating optimal control laws for switched systems with nonlinear dynamics and continuous inequality constraints. We discuss computational strategiesfor optimizing both the times at which a switched system switches from one mode to another (the so-called switching times) and the sequence in which a switched system operates its various possible modes (the so-called switching sequence). These strategies involve novel combinations of the control parameterization method, the timescaling transformation, and bilevel programming and binary relaxation techniques. We conclude the paper by discussing a number of switched system optimal control models arising in practical applications

Switched-capacitor converters with multiphase interleaving control

This paper proposes a configuration of switched-capacitor converters with multiphase interleaving control that can perform conventional switched-capacitor voltage conversions with little electromagnetic interference over a wide range of operating condition. This is achieved by having multiple units of switched-capacitor converter connected in parallel and a unit selection control scheme which works along the interleaving control to vary the number of converters in operation. By having the capacitors of inactive units connected to the output and the converters operating with output interleaving operation, the output capacitor that is typically required in switched-capacitor converters for maintaining a small voltage ripple is made redundant in this configuration. © 2011 IEEE.link_to_subscribed_fulltex

Nonlinear control of switched-capacitor converter using sliding mode control approach

Author name used in this publication: Chi K. TseRefereed conference paper2007-2008 > Academic research: refereed > Refereed conference paperVersion of RecordPublishe

Model predictive control of microgrids - an overview

202205 bchyNot applicableOthersSchool of Engineering, IT and Physical Sciences, Federation University AustraliaPublished24 month

Interleaved switched-capacitor converters with adaptive control

The switched-capacitor converters are ideal switching-mode power supplies for consumers portable electronic devices due to their light weight, small size, and high power density. However, they suffer from a discontinuous input current waveform with large di/dt, which leads to significant electromagnetic interference (EMI) emission. This paper proposes a configuration of switched-capacitor converters connected in parallel, with their inputs and outputs interleaved and adaptively controlled. The interleaving operation is performed by using an original type of control in which both the capacitors' charging time T on and switching frequency are adjusted to get the line and load regulation. It is shown that, for a given range of variation of the supply voltage and load, there always exists a solution [T on, T S] assuring both output voltage regulation and a perfect interleaving. Experimental results are provided to validate the feasibility of the proposed scheme. Precise interleaving and good line and load regulation are maintained for all the designated range, including the transient times. © 2010 IEEE.link_to_subscribed_fulltex