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  • 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
    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
    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
    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
    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
    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
  • Journal article
    Angeli D, Casavola A, Mosca E, 2000,

    Predictive PI-control of linear plants under positional and incremental input saturations

    , Automatica, Vol: 36, Pages: 1505-1516, ISSN: 0005-1098

    A predictive control strategy is developed for set-point tracking of LTI plants in the presence of joint positional and incremental (rate) input saturation constraints. The resulting control algorithm is built so as to provide an integral action capable to asymptotically reject arbitrary constant disturbances. This task is achieved by possibly modifying on-line the set-point in the case this becomes incompatible with constraints and disturbances. When applied to asymptotically null controllable with bounded inputs (ANCBI) plants, viz. all stabilizable linear systems with eigenvalues in the closed unit circle, the control law is shown to globally provide set-point tracking in the presence of arbitrary constant disturbances and initial state. For non-ANCBI plants, viz. systems with exponentially unstable modes, the control law features the mentioned properties locally, viz. in bounded regions of initial states and disturbances. © 2000 Elsevier Science Ltd. All rights reserved.
  • Conference paper
    Hernandez-Aramburo CA, Green TC, McClay CI, 2000,

    Integrated simulation of an inverter driven induction motor

    , 8th International Conference on Power Electronics and Variable Speed Drives, Publisher: INST ELECTRICAL ENGINEERS INSPEC INC, Pages: 560-565, ISSN: 0537-9989
  • Conference paper
    Hui SYR, Tang SC, Chung H, 2000,

    A low-profile low-power converter with isolated voltage output

    , Pages: 95-99

    In this paper, an isolated low-profile power converter using a coreless printed-circuit-board (PCB) transformer is described. The diameter of the coreless PCB transformer is merely 0.46cm. Because of the high frequency (8MHz) operation involved, the gate drive electronics has to be soft-switched in order to achieve high energy efficiency and reduce the gate drive power consumption. The very thin PCB used in the converter facilitates energy coupling from the primary winding to the secondary side of the transformer. The output voltage can be regulated and programmable. The converter's power output is about 0.5W with a typical transformer efficiency of 63%.
  • Conference paper
    Parisini T, Sacone S, 2000,

    Hybrid control based on discrete-event automata and receding horizon neural controllers

    , 39th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 510-515, ISSN: 0743-1546
  • Conference paper
    Zhang XD, Polycarpou M, Parisini T, 2000,

    Abrupt and incipient fault isolation of nonlinear uncertain systems

    , 2000 American Control Conference (ACC 2000), Publisher: IEEE, Pages: 3713-3717, ISSN: 0743-1619
  • Conference paper
    Parisini T, Sacone S, 2000,

    Hybrid control based on discrete-event automata and receding-horizon neural controllers

    , IEEE International Symposium on Intelligent Control/8th IEEE Mediterranean Conference on Control and Automation, Publisher: IEEE, Pages: 303-308
  • Conference paper
    Baglietto M, Cervellera C, Parisini T, Sanguineti M, Zoppoli Ret al., 2000,

    Approximating networks, dynamic programming and stochastic approximation

    , 2000 American Control Conference (ACC 2000), Publisher: IEEE, Pages: 3304-3308, ISSN: 0743-1619
  • Conference paper
    Astolfi A, Menini L, 2000,

    New examples in noninteracting control for Hamiltonian systems

    , IFAC Workshop on Lagrangian and Hamiltonian Methods for Nonlinear Control, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 145-150
  • Conference paper
    Pal BC, Coonick AH, Macdonald DC, 2000,

    Robust damping controller design in power systems with superconducting magnetic energy storage devices.

    , 2000 Winter Meeting of the IEEE Power Engineering-Society, Publisher: IEEE, Pages: 1520-1520
  • Conference paper
    Sandells DW, Green TC, 2000,

    The chain cell PFC

    , 31st Annual IEEE Power Electronics Specialists Conference (PESC 2000), Publisher: IEEE, Pages: 955-960, ISSN: 0275-9306
  • Conference paper
    Kerrigan EC, Bemporad A, Mignone D, Morari M, Maciejowski JMet al., 2000,

    Multi-objective prioritisation and reconfiguration for the control of constrained hybrid systems

    , 2000 American Control Conference (ACC 2000), Publisher: IEEE, Pages: 1694-1698, ISSN: 0743-1619
  • Conference paper
    Kerrigan EC, Maciejowski JM, 2000,

    Invariant sets for constrained nonlinear discrete-time systems with application to feasibility in Model Predictive Control

    , 39th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4951-4956, ISSN: 0743-1546
  • Conference paper
    Frankowska H, Vinter RB, 2000,

    Existence of neighbouring feasible trajectories: Applications to dynamic programming for state constrained optimal control problems

    , 39th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4618-4623, ISSN: 0743-1546
  • Conference paper
    Ooi HS, Green TC, 2000,

    Sensorless switched reluctance motor drive with torque ripple minimization

    , 31st Annual IEEE Power Electronics Specialists Conference (PESC 2000), Publisher: IEEE, Pages: 1538-1543, ISSN: 0275-9306
  • Conference paper
    Mayne DQ, De Dona JA, Goodwin GC, 2000,

    Improved stabilising conditions for model predictive control

    , 39th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 172-177, ISSN: 0743-1546
  • Journal article
    Frankowska H, Vinter RB, 2000,

    Existence of neighboring feasible trajectories: Applications to dynamic programming for state-constrained optimal control problems

    , JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS, Vol: 104, Pages: 21-40, ISSN: 0022-3239
  • Journal article
    Chung HSH, Hui SYR, Tang SC, Wu Aet al., 2000,

    On the use of current control scheme for switched-capacitor DC/DC converters

    , IEEE Transactions on Industrial Electronics, Vol: 47, Pages: 238-244, ISSN: 0278-0046

    This paper presents an investigation into the use of a current control scheme (CCS) and a comparison with a classical switching scheme for switched-capacitor (SC) step-down dc/dc converters. With the CCS, capacitors are charged with near-constant current, controlled by the gate-source voltage of MOSFET's. By paralleling two SC cells, the converter input current becomes continuous, resulting in much reduced conducted electromagnetic interference with other circuits fed by the same power supply. All MOSFET's are operated for half of the switching period, in order to improve the regulation capability. Static and dynamic behaviors of the converter with the CCS are predicted and confirmed in an experimental 36-W 12-V/9-V prototype.
  • Journal article
    Angeli D, Sontag ED, Wang Y, 2000,

    A characterization of integral input-to-state stability

    , IEEE Transactions on Automatic Control, Vol: 45, Pages: 1082-1097, ISSN: 0018-9286

    The notion of input-to-state stability (ISS) is now recognized as a central concept in nonlinear systems analysis. It provides a nonlinear generalization of finite gains with respect to supremum norms and also of finite L2 gains. It plays a central role in recursive design, coprime factorizations, controllers for nonminimum phase systems, and many other areas. In this paper, a newer notion, that of integral input-to-state stability (iISS), is studied. The notion of iISS generalizes the concept of finite gain when using an integral norm on inputs but supremum norms of states, in that sense generalizing the linear "H2" theory. It allows one to quantify sensitivity even in the presence of certain forms of nonlinear resonance. We obtain here several necessary and sufficient characterizations of the iISS property, expressed in terms of dissipation inequalities and other alternative and nontrivial characterizations. These characterizations serve to show that integral input-to-state stability is a most natural concept, one that might eventually play a role at least comparable to, if not even more important than, ISS. © 2000 IEEE.
  • Journal article
    Ho YKE, Hui SYR, Lee YS, 2000,

    Characterization of single-stage three-phase power-factor-correction circuit using modular single-phase PWM dc-to-dc converters

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 62-71, ISSN: 0885-8993

    The complete dc characteristics of the three-phase modular power-factor-correction (PFC) converters using single-phase pulsewidth modulation (PWM) dc-to-dc converter modules for high-power application are studied. Using circuit averaging, the converter input and output quantities are determined numerically. Both the continuous and discontinuous output current modes of operation (CCM and DCM) are studied in detail. Near-unity power factor can be achieved with the converter modules operating in the DCM. An averaged model was used to study and determine the boundaries between DCM and CCM over the full period of the three-phase input voltage. It is found that high power factor is inherent in the converter system provided that the converters are operated in the DCM and the voltage conversion ratio is selected properly. The criteria for obtaining high power factor are analyzed and the optimal circuit parameters are determined to obtain the best achievable power factor. Both simulations and experimental results from a 1.5-kW prototype using full-bridge converter modules have confirmed the analysis.
  • Conference paper
    Hernandez-Aramburo C, Green TC, Mcclay CI, 2000,

    Integrated Simulation of an Inverter Driven Induction Machine

    , Eighth International IEE Power Electronics and Variable Speed Drives Conference, 2000, Pages: 560-565
  • Conference paper
    Ooi HS, Green TC, 2000,

    Sensor-less control of a switched reluctance motor with torque ripple minimisation

    , IEEE Power Elec Specialist Conf. (PESC), Pages: 1538-1543
  • Book chapter
    Mayne DQ, 2000,

    Nonlinear model predictive control: challenges and opportunities

    , Progress in Systems and Control Theory, Editors: Allgower, Publisher: Birkhauser Verlag, Pages: 23-44

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