Publications

Search or filter publications

Filter by type:

Filter by publication type

Filter by year:

to

Results

  • Showing results for:
  • Reset all filters

Search results

  • Conference paper
    Astolfi A, Colaneri P, 2001,

    A novel algorithm for the solution of the static output feedback stabilization problem

    , 40th IEEE conference on decision and control, Orlando, Florida, 4 - 7 December 2001, Publisher: IEEE Control Systems Society, Pages: 4875-4876
  • Conference paper
    Kerrigan EC, Maciejowski JM, 2001,

    Robust feasibility in model predictive control: Necessary and sufficient conditions

    , 40th IEEE Conference on Decision and Control, 4 - 7 December 2001, ORLANDO, FLORIDA, Publisher: IEEE, Pages: 728-733
  • Conference paper
    Papakos V, Jaimoukha IM, 2001,

    Implicitly restarted lanczos algorithm for model reduction

    , 40th IEEE conference on decision and control, Orlando, Florida, 4 - 7 December 2001, Publisher: IEEE Control Systems Society, Pages: 3671-3672
  • Conference paper
    Astolfi A, Colaneri P, 2001,

    Static output feedback stabilization: from linear to nonlinear and back

    , Godalming, 2nd workshop of the nonlinear control network, Paris, France, 5 - 9 June 2000, Publisher: Springer-Verlag, London Ltd, Pages: 49-71
  • Conference paper
    Astolfi A, Chhabra D, Ortega R, 2001,

    Asymptotic stabilization of selected equilibria of the underactuated Kirchhoff's equations

    , American control conference, Arlington, VA, Publisher: IEEE, Pages: 4862-4867
  • Conference paper
    Holdsworth L, Jenkins N, Strbac G, 2001,

    Electrical stability of large, offshore wind farms

    , Pages: 156-161, ISSN: 0537-9989
  • Conference paper
    Chryssochoos I, Vinter RB, 2001,

    Dynamic programming and optimal control problems on Manifolds

    , European control conference 2001, August 2001
  • Conference paper
    Limebeer DJN, Evangelou S, Sharp RS, 2001,

    Stability of motorcycles under acceleration and braking

    , Proceedings of DETC'2001, 18th biennial conference on mechanical vibration and noise; ASME design engineering technical conferences and computers and information in engineering, Pittsburgh, PA, Publisher: ASME, Pages: 2583-2592
  • Conference paper
    Lovera M, Astolfi A, 2001,

    Global attitude regulation using magnetic control

    , New York, 40th IEEE conference on decision and control, Orlando, Florida, 4 - 7 December 2001, Publisher: IEEE, Pages: 4604-4609
  • Conference paper
    Strbac G, 2001,

    Trading electricity and ancillary services in the reformed England and Wales electricity market

    , Winter meeting of the IEEE Power Engineering Society; Wolumbus, OH, Publisher: Institute of Electrical and Electronics Engineers, Pages: 41-44
  • Conference paper
    Kaliora G, Astolfi A, 2001,

    A simple design for the stabilization of a class of cascaded nonlinear systems with bounded control

    , New York, 40th IEEE conference on decision and control, Orlando, Florida, 4 - 7 December 2001, Publisher: IEEE, Pages: 3784-3789
  • Conference paper
    Bianchini G, Falugi P, Tesi A, Vicino Aet al., 2001,

    On the synthesis of restricted complexity controllers for uncertain plants with ellipsoidal perturbations

    , 40th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 1562-1567, ISSN: 0743-1546
  • Conference paper
    Chisci L, Falugi P, Zappa G, 2001,

    Predictive control for constrained systems with polytopic uncertainty

    , American Control Conference (ACC), Publisher: IEEE, Pages: 3073-3078, ISSN: 0743-1619
  • Conference paper
    Zhang XD, Polycarpou MM, Parisini T, 2001,

    Integrated design of fault diagnosis and accommodation schemes for a class of nonlinear systems

    , 40th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 1448-1453, ISSN: 0191-2216
  • Journal article
    Tse KK, Chung HSH, Hui SY, So HCet al., 2000,

    Analysis and spectral characteristics of a spread-spectrum technique for conducted EMI suppression

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 399-410, ISSN: 0885-8993

    Frequency modulation (FM) and random switching methods have been used for reducing conducted electromagnetic interference (EMI) in power converters. Limited theoretical studies and comparisons of these schemes, however, are available. In this paper, a detailed analysis and the spectral characteristics of a random carrier-frequency (RCF) technique for suppressing conducted EMI in an offline switched-mode power supply are presented. The analysis provides a theoretical platform for studying the characteristics of this random switching scheme. The level of randomness is defined for the RCF scheme and varied in the converter example so that its effects on the power spectra can be demonstrated. Theoretical predictions of the spectral characteristics of this scheme are confirmed with measurements. The RCF scheme has been compared with the standard constant-frequency pulsewidth modulation (PWM) scheme and the FM scheme. Comparisons of their spectral performance show that the RCF scheme has better conducted EMI suppression than the FM and standard PWM schemes.
  • Journal article
    Tse KK, Chung HSH, Hui SYR, So HCet al., 2000,

    A comparative investigation on the use of random modulation schemes for dc/dc converters

    , IEEE Transactions on Industrial Electronics, Vol: 47, Pages: 253-263, ISSN: 0278-0046

    A comparative investigation on the use of random modulation schemes for dc/dc converters is presented. The modulation schemes under consideration include randomized pulse position modulation, randomized pulsewidth modulation (PWM), and randomized carrier-frequency modulation with fixed and variable duty cycle. The paper emphasizes the suitability and applicability of each scheme in dc/dc converters. Issues addressed include the effectiveness of randomness level on spreading the dominating frequencies that normally exist in constant-frequency PWM schemes, and the low-frequency power spectral density (PSD) of each scheme. The validity of the analyses is confirmed experimentally by using a dc/dc buck converter operating in continuous conduction mode. The PSD of the output under each scheme will be presented and compared. © 2000 IEEE.
  • Journal article
    Casavola A, Mosca E, Angeli D, 2000,

    Robust command governors for constrained linear systems

    , IEEE Transactions on Automatic Control, Vol: 45, Pages: 2071-2077, ISSN: 0018-9286

    Robust command governors are designed for discrete-time linear time-variant (LTV) system with polytopic uncertainty models and subject to unknown bounded disturbances and pointwise-in-time input and state-related constraints.
  • Journal article
    Tang SC, Hui SY, Chung HSH, 2000,

    Characterization of coreless printed circuit board (PCB) transformers

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 1275-1282, ISSN: 0885-8993

    In this paper, coreless printed-circuit-board transformers are characterized. A range of coreless printed circuit board (PCB) transformers with different geometric parameters have been fabricated and tested. Based on a recently reported analytic method, the self inductance of these transformers is calculated. This analytical method is also extended to cover the prediction of the transformers' mutual inductance. All calculated parameters have been confirmed with measurements for the frequency range from 100 kHz to 30 MHz. These results provide useful information for the optimal design of coreless PCB transformers.
  • Journal article
    Basseville M, Parisini T, 2000,

    Special issue: Fault detection and isolation

    , INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Vol: 14, Pages: 681-682, ISSN: 0890-6327
  • Journal article
    Hui SY, Chung HSH, Yip SC, 2000,

    A bidirectional ac-dc power converter with power factor correction

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 942-949, ISSN: 0885-8993

    This paper presents new operation and performance of a thyristor-based ac-dc current-controlled boost-type converter that allows bidirectional power handling capability and provides input power factor correction and a near-sinusoidal input current waveform. The new converter can reduce harmonic pollution and disturbance on the supply mains. The feature of bidirectional power flow allows the stored energy in loads, such as motors, to regenerate back to the supply source, leading to an increase in overall energy efficiency and possibly a reduction in the size of the dc link capacitor. The operation is confirmed with the successful implementation of an experimental prototype. © 2000 IEEE.
  • Journal article
    Tang SC, Hui SY, Chung HSH, 2000,

    Coreless planar Printed-Circuit-Board (PCB) transformers - A fundamental concept for signal and energy transfer

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 931-941, ISSN: 0885-8993

    Magnetic cores have been used in transformers for over a century. In this paper, the authors present a fundamental concept of using "coreless" printed-circuit-board (PCB) transformers. With the aid of a high-frequency equivalent circuit, the use and basic characteristics of coreless PCB transformers are described. Optimal operating conditions for minimum input power requirement and maximum efficiency operations are identified. Coreless PCB transformers have the advantages of low costs, very high power density, no limitation due to magnetic cores, no magnetic loss and ease of manufacturing. They have the potential to be developed in microcircuits. A printed planar PCB transformer with a diameter of about 1.0cm and power capability of 19W has been successfully tested. The power density of the PCB transformer demonstrated in this paper is 24 W/cm 2. The maximum efficiency can be greater than 90%. The analysis has been confirmed with experiments. Coreless printed transformers have great potential in applications in which stringent height and space requirements have to be met. © 2000 IEEE.
  • Journal article
    Chung HSH, Chow WC, Hui SYR, Lee STSet al., 2000,

    Development of a switched-capacitor dc-dc converter with bidirectional power flow

    , IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, Vol: 47, Pages: 1383-1389, ISSN: 1057-7122

    This brief presents a switched-capacitor dc-dc converter that offers features of voltage step-down, voltage step-up, and bidirectional power flow. Concept of energy transfer is achieved by using two current-controlled bidirectional converter cells, which are operating in antiphase. Good regulation capability and continuous input current waveform are other substantial advantages that facilitate practical realization and reduce electromagnetic interference with other circuits and supply networks. State-space averaging technique is applied to study the static and dynamic characteristics. A 20-W, 5-V-9-V prototype has been built and has an overall efficiency of over 80% in all operations.
  • Conference paper
    Kerrigan EC, Maciejowski JM, 2000,

    Soft Constraints and Exact Penalty Functions in Model Predictive Control

    , United Kingdom Automatic Control Council: Control 2000
  • Journal article
    Tse KK, Chung HSH, Hui SYR, So HCet al., 2000,

    Spectral characteristics of randomly switched PWM DC/DC converters operating in discontinuous conduction mode

    , IEEE Transactions on Industrial Electronics, Vol: 47, Pages: 759-769, ISSN: 0278-0046

    This paper addresses a comparative study of the spectral characteristics of four random-switching schemes that apply to the basic pulsewidth-modulation (PWM) dc/dc converters operating in discontinuous conduction mode (DCM). They include randomized pulse position modulation, randomized pulsewidth modulation, and randomized carrier frequency modulation with fixed duty cycle and with fixed duty time, respectively. Mathematical models that characterize the input current and output voltage of the three basic PWM converters operating in DCM are derived. In particular, the effectiveness of spreading the dominant switching harmonics in the input current that normally exist in the standard PWM scheme and the introduction of low-frequency harmonics in the output voltage with respect to the randomness level are investigated. The validity of the models and analyses are confirmed experimentally by using a dc/dc buck converter.
  • Journal article
    Chen G, Lee YS, Hui SYR, Xu D, Wang Yet al., 2000,

    Actively clamped bidirectional flyback converter

    , IEEE Transactions on Industrial Electronics, Vol: 47, Pages: 770-779, ISSN: 0278-0046

    An actively clamped bidirectional flyback converter is proposed. The converter's operation is examined in detail. All switches in the converter have zero-voltage-switching characteristics. A low-frequency behavior model and small-signal transfer functions are derived. It is found that the flow of current is directly under the control of the duty cycle, and that the transformer's leakage inductance has a significant effect on the control characteristic of the converter. It is expected that such bidirectional converters will find wide applications in the interconnection of multiple sources of dc power to a common bus (e.g., in a dc uninterruptible power supply). Simulation and experiment results are also presented.
  • Journal article
    Chung HSH, Hui SY, Tang SC, 2000,

    Development of a multistage current-controlled switched-capacitor step-down DC/DC converter with continuous input current

    , IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, Vol: 47, Pages: 1017-1025, ISSN: 1057-7122

    This paper presents the design and analysis of a low-profile multistage current-controlled switched-capacitor (SC) step-down dc/dc converter. The converter not only exhibits all advantages of classical SC converters, but also features good regulation capability and continuous input current waveform, resulting in low conducted electromagnetic interference with the supply network. The concept of energy transfer is achieved by paralleling the input and output of two step-down converter cells and operating them in antiphase. The voltage conversion ratio is determined by controlling the charging trajectories of the capacitors in each cell. As the circuit is unnecessary to use any inductive elements, possibilities of integrated circuit fabrication and high power density are promising. By applying the state-space averaging technique, a third-order state-space model for an n-stage converter is derived. Static and small-signal dynamic behaviors of the converter are investigated. A 70-W 48-V/12 V converter is implemented. Analytical predictions are verified with experimental measurements.
  • Journal article
    Lu Z, Qian Z, Green TC, 2000,

    Soft switched AC/DC power converter and their EMI property improvement

    , Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering, Vol: 20, Pages: 14-18, ISSN: 0258-8013

    Soft-switching techniques can improve DC/DC power converter's efficiency and reduce its EMI. The method is attractive to the unity-power-factor AC/DC converter in the view of the EMC requirement for lower switching noise. A soft-switched boost converter has been studied in topology analysis, PSPICE simulation and circuit experiment. The reduction effects of AC/DC converter EMI emission by using soft-switching techniques and its limitation are investigated.
  • Journal article
    Hui SY, Tang SC, Chung HSH, 2000,

    Some electromagnetic aspects of coreless PCB transformers

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 805-810, ISSN: 0885-8993

    In this paper, some EMI aspects of using coreless PCB transformers are addressed. Based on the antenna theory, the radiated power of a coreless PCB transformer is estimated and found to be negligible. The electromagnetic field plot of a power electronic circuit using a gate drive circuit isolated by a coreless PCB transformer has been recorded. The major radiated EMI source in the frequency range of 30 MHz to 300 MHz is found to be the copper tracks of the power circuit, where switching transients occur, rather than the coreless PCB transformer. Coreless PCB transformers essentially operate at relatively low frequency (8 MHz in this case) by near-field magnetic coupling. Experimental results have confirmed that the application of coreless PCB transformer in gate drive circuit will not impose any serious EMI problem on the power electronic circuit.
  • Journal article
    Tang SC, Hui SYR, Chung H, 2000,

    Coreless printed circuit board (PCB) transformers with high power density and high efficiency

    , Electronics Letters, Vol: 36, Pages: 943-944, ISSN: 0013-5194

    The authors report the use of a coreless printed circuit board transformer for power conversion with very high power density and efficiency. A coreless PCB transformer with an outermost radius of ∼1 cm and 19 turns for both the primary and secondary windings can transfer 19W at an efficiency of 90%, resulting in a record power density of 24W/cm2. The power density and energy efficiency of a coreless PCB transformer are higher than those of core-based microtransformers. Coreless transformers are simpler in structure, easier to implement in silicon wafer and cheaper than core-based planar transformers.
  • Journal article
    Pal BC, Coonick AH, Jaimoukha IM, El-Zobaidi Het al., 2000,

    A linear matrix inequality approach to robust damping control design in power systems with superconducting magnetic energy storage device

    , IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 15, Pages: 356-362, ISSN: 0885-8950

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://www.imperial.ac.uk:80/respub/WEB-INF/jsp/search-t4-html.jsp Request URI: /respub/WEB-INF/jsp/search-t4-html.jsp Query String: id=955&limit=30&page=68&respub-action=search.html Current Millis: 1723828623759 Current Time: Fri Aug 16 18:17:03 BST 2024