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  • Conference paper
    Astolfi A, Menini L, 1999,

    Further results on decoupling with stability for Hamiltonian systems

    , 1st Workshop of the Nonlinear Control Network, Publisher: SPRINGER-VERLAG, LONDON LTD, Pages: 19-51, ISSN: 0170-8643
  • Journal article
    Ferreira M, Fontes F, Vinter RB, 1999,

    Nondegenerate Necessary Conditions for Nonconvex Optimal Control Problems with State Constraints

    , Journal of Mathematical Analysis and Applications
  • Conference paper
    Astolfi A, Laiou C, Mazenc F, 1999,

    New results and examples on a class of discontinuous controllers

    , European Control Conference, Karlsruhe, Germany
  • Conference paper
    Antonelli R, Astolfi A, 1999,

    Adaptive output feedback stabilization of a class of uncertain continuous stirred tank reactors

    , 14th IFAC World Congress, Beijing, China
  • Conference paper
    Mazenc F, Astolfi A, 1999,

    Robust output feedback stabilization of the angular velocity of a rigid body

    , 14th IFAC World Congress, Beijing, China
  • Journal article
    Zhou Y, Allwright JC, 1999,

    Solution of an optimal control problem using a proximal point algorithm

    , IEEE Trans.Automatic Control
  • Book chapter
    Astolfi A, Menini L, 1999,

    Control of Nonlinear Hamiltonian Systems

    , Modern Control Theory, Editors: Huba, Menini, Tornambe, Zakova, Publisher: Progetto Leonardo
  • Journal article
    Allwright JC, 1999,

    Orthogonal Lyapunov transformations with some applications to stability studies

    , IEE Proc.Control Theory and Applications, Vol: 146, Pages: 333-340
  • Journal article
    Pytlak R, Vinter RB, 1999,

    A Feasible Directions Type Algorithm for Optimal Control Problems with State and Control Constraints: Implementation

    , Jota, Vol: 101, Pages: 623-650
  • Book chapter
    Ortega R, Astolfi A, Bastin G, Rodriguez Het al., 1999,

    Output feedback stabilization of mass balance systems

    , Output feedback stabilization of nonlinear systems, Editors: Nijmeijer, Fossen, Publisher: Springer Verlag
  • Journal article
    Chung H, Hui SYR, Wang WH, 1998,

    An isolated ZVS/ZCS flyback converter using the leakage inductance of the coupled inductor

    , IEEE Transactions on Industrial Electronics, Vol: 45, Pages: 679-682, ISSN: 0278-0046

    This paper describes a simple and effective way to modify an existing hard-switched flyback converter into a circuit with zero-voltage switching (ZVS) and zero-current switching (ZCS). The key improvement is to turn the unattractive features of the coupled inductor leakage inductance and snubber capacitor into attractive ones. The coupled inductor leakage inductance and snubber are used to form a quasiresonant circuit to facilitate ZVS/ZCS of all power devices. The operating principles of the converter and experimental results are presented. Index Terms-Converter, power electronics, power supplies, resonant power conversion. © 1998 IEEE.
  • Journal article
    Shrivastava Y, Sathiakumar S, Hui SY, 1998,

    Improved spectral performance of random PWM schemes with weighted switching decision

    , IEEE Transactions on Power Electronics, Vol: 13, Pages: 1038-1045, ISSN: 0885-8993

    The authors present a statistical approach to the analysis of random pulsewidth modulation (RPWM) methods which generate PWM signals by comparing a reference modulating function with random numbers or signals. Such an approach is used to analyze and optimize a new weighted RPWM (WRPWM) method and also a standard trapezoidal RPWM method. The WRPWM scheme combines the advantages of the nondeterministic and deterministic PWM methods by adding some deterministic nature into the nondeterministic RPWM method. Both theoretical and experimental results confirm that the optimized WRPWM method has better spectral performance over the standard RPWM schemes and has attractive features such as the potential of third-harmonic boosting, reduced acoustic noise, and minimal low-order harmonics under an over modulation condition for electronic drive applications.
  • Journal article
    Hui SYR, Chung H, Ho YKE, Lee YSet al., 1998,

    Modular development of single-stage 3-phase PFC using single-phase step-down converters

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Vol: 1, Pages: 776-782, ISSN: 0275-9306

    This paper describes the modular development of a family of single-stage AC-DC power converters. The family of converters offers advantageous features such as simple switching control, electrically isolated output, inherent power factor correction, single stage power conversion without using power devices of excessively high voltage and current ratings, the flexibility for expansion of power capability and a simplification of design and production procedure of power converter products. Prototypes up to 1 kW are used to demonstrate the operating principle. © 1998 IEEE.
  • Journal article
    Hui SY, Shrivastava Y, Sathiakumar S, Tse KK, Chung HSHet al., 1998,

    A comparison of nondeterministic and deterministic switching methods for DC-DC power converters

    , IEEE Transactions on Power Electronics, Vol: 13, Pages: 1046-1055, ISSN: 0885-8993

    An analysis and experimental results of the random pulsewidth modulation (RPWM) and random pulse-position modulation (RPPM) methods for dc-dc converters are presented. The characteristics and performance of power converters under two randomized modulations are evaluated. The theoretical relationships of discrete harmonics, continuous noise, and output-voltage ripple of the RPWM and RPPM schemes are established and compared with those of a standard deterministic pulsewidth modulation (PWM) scheme in a buck converter. Limitations in the randomly switched dc-dc converters, which have not been addressed before, are highlighted. Randomized schemes generally have inherent problems in achieving low-output-voltage ripple due to the low-frequency continuous noise within the passband of the converter filter. The inherent low-frequency noise-induced voltage ripple problems of nondeterministic switching methods for dc converters are confirmed experimentally. The performance of the RPPM method is found to be closer to the standard PWM method than that of the RPWM method. For dc-dc power conversion, the RPPM method offers much better output-voltage performance than the RPWM method.
  • Journal article
    Chung H, Hui SYR, Tse KK, 1998,

    Reduction of power converter EMI emission using soft-switching technique

    , IEEE Transactions on Electromagnetic Compatibility, Vol: 40, Pages: 282-287, ISSN: 0018-9375

    Measurements of conducted and radiated electromagnetic interference (EMI) emission from hard-switched and soft-switched buck, boost, and flyback converters of similar power ratings are presented. Results indicate that EMI emission can be substantially reduced by using soft-switching technique in power converters. Thus, soft-switching technique provides a practical and useful solution to reduce EMI emission from switched-mode power circuits. A comparison of EMI emission on the three classes of converters is also included. The flyback converter is found to be the least EMC friendly among the converters tested.
  • Journal article
    Ho YKE, Hui SYR, Lee YS, 1998,

    Optimal operation of single-stage three-phase power factor correction circuit using modular PWM DC-to-DC converters

    , Electronics Letters, Vol: 34, Pages: 2300-2301, ISSN: 0013-5194

    A critical conduction parameter A3Φ is derived for the three-phase modular system. This parameter optimises the output filter to achieve the highest power factor of the system. The voltage conversion ratio required to achieve a high power factor to fulfil the harmonic requirements is also derived. Both simulations and experimental results from a 1.5kW prototype using full-bridge converters have confirmed the analysis.
  • Journal article
    Parisini T, Zoppoli R, 1998,

    Neural approximations for infinite-horizon optimal control of nonlinear stochastic systems

    , IEEE TRANSACTIONS ON NEURAL NETWORKS, Vol: 9, Pages: 1388-1408, ISSN: 1045-9227
  • Journal article
    Bolla R, Davoli F, Maryni P, Parisini Tet al., 1998,

    An adaptive neural network admission controller for dynamic bandwidth allocation

    , IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS, Vol: 28, Pages: 592-601, ISSN: 1083-4419
  • Journal article
    Lewis FL, Parisini T, 1998,

    Neural network feedback control with guaranteed stability

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 70, Pages: 337-339, ISSN: 0020-7179
  • Journal article
    Parisini T, Sanguineti M, Zoppoli R, 1998,

    Nonlinear stabilization by receding-horizon neural regulators

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 70, Pages: 341-362, ISSN: 0020-7179
  • Journal article
    Hui SYR, Tang SC, Chung H, 1998,

    Coreless printed-circuit board transformers for signal and energy transfer

    , Electronics Letters, Vol: 34, Pages: 1052-1054, ISSN: 0013-5194

    The authors describe the optimal use of a printed-circuit board transformer with minimum power consumption. The proposed transformer is much smaller than a standard pulse transformer and is suitable for both signal and energy transfer. It can be operated in the megaHertz frequency range. With the use of modulation/demodulation circuits, it can be used for digital signal transmission over a wide frequency range from DC to ∼300kHz. The proposal can replace core-based transformers in many low-power applications.
  • Journal article
    Clarke FH, Ledyaev Y, Vinter RB, 1998,

    Regularity properties of solutions to linear quadratic optimal control problems with state constraints (vol 30, pg 265, 1997)

    , SYSTEMS & CONTROL LETTERS, Vol: 33, Pages: 139-139, ISSN: 0167-6911
  • Journal article
    Zhu P, Hui SYR, 1998,

    Modelling of a high-frequency operated fluorescent lamp in an electronic ballast environment

    , IEE Proceedings: Science, Measurement and Technology, Vol: 145, Pages: 111-116, ISSN: 1350-2344

    The authors describe the dynamic modelling of a high-frequency operated fluorescent lamp in an electronic ballast environment. The model inherently includes the negative resistive characteristic, allows the study of electronic ballast design using series resonant converters, and can provide useful information for the optimisation of the electronic ballast design. The fluorescent lamp model for high-frequency operation has been developed and implemented. Predictions for the lamp system operation generally agree very well with measurements obtained from a 33 kHz electronic ballast - fluorescent lamp system. The use of the model for the designing the ballast components is illustrated. This model is simple and can be employed in existing simulation packages for computer-aided electronic ballast designs. © IEE, 1998.
  • Conference paper
    Antoulas AC, Astolfi A, 1998,

    Optimizing the EV of the data matrix: a case study in non-smooth analysis

    , 37th Conference on Decision and Control, Tampa, FL
  • Conference paper
    El-Zobaidi H, Jaimoukha IM, 1998,

    Robust Control and Model and Controller Reduction of Linear Parameter Varying Systems

    , Proc 37th IEEE Conference on Decision and Control, Pages: 3015-3020
  • Conference paper
    Rapaport A, Astolfi A, 1998,

    Practical L2 disturbance attenuation for nonlinear systems

    , IFAC Symposium on Nonlinear Control System Design, Enschede, The Netherlands
  • Journal article
    Halikias GD, Jaimoukha IM, 1998,

    Hierarchical Optimization in H_infinity

    , IEEE Trans.Automatic Control, Vol: 43, Pages: 1123-1128
  • Conference paper
    Mazenc F, Astolfi A, 1998,

    Nonlinear Stabilization of Particular Interconnected Structures

    , 37th Conference on Decision and Control, Tampa, FL
  • Conference paper
    Antonelli R, Astolfi A, 1998,

    Global temperature stabilization of endothermic reactors with bounded control

    , 6th Mediterranean Control Conference, Alghero, Italy
  • Conference paper
    Loewen PD, Zheng H, Vinter RB, 1998,

    A Maximum Principle for Problems with Nondifferentiable Data

    , Proc. 37 IEEE Conference on Decision and Control, Tampa, Florida

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