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  • 1. Bosch, Jan
    et al.
    Lundberg, Christer
    Hultgren, Anders
    Multiple Object Interfaces in Object-Oriented Control Systems1996Conference paper (Refereed)
    Abstract [en]

    When modelling complex computer systems, four primary modelling techniques are available to the software engineer, i.e. abstraction, composition, functional decomposition and multiple client interfaces (views). Abstraction and composition can directly be expressed in traditional object-oriented models and functional decomposition can often be expressed using subsystems. However, traditional object models provide no expressiveness for multiple client interfaces. This forces designers to either model all different views on a conceptual object as a large, complex implementation object or to model each view as an object and relate the different view objects. Both approaches suffer from problems of complexity, maintainability and reusability. As a solution, we propose the layered object model that allows for the expressive, flexible and extensible definition of multiple client interfaces. To illustrate the problems associated with views and our proposed solution, the domain of industrial control systems is used.

  • 2.
    Hultgren, Anders
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Bui, S.
    Linnér, Jörgen
    Ranstad, Per
    Lenells, Matz
    Fault tolerant high voltage resonant power converter application2013Conference paper (Refereed)
    Abstract [en]

    A high voltage and high power fault tolerant application of a resonant converter is presented. The resonant converter load shows frequent short circuits making the load voltage drop to zero within some us, implying high stress on the main circuit components. A load voltage short circuit fault tolerant system is suggested by including a novel way of augmenting the controller with a load voltage estimator. The estimator can detect load voltage short circuit and will then be a part of a fault tolerant high voltage resonant converter.

  • 3.
    Hultgren, Anders
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Kulesza, Wlodek
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Magnus
    Walther, Björn
    Integration av matematik och teknik på ingenjörsutbildningar2009Conference paper (Refereed)
    Abstract [en]

    An possible integration of mathematics and applications within engineering is presented. The integration method has been used at The university of Kalmar. The method is described and experiences are presented.

  • 4.
    Hultgren, Anders
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Melin, Jan
    Ranstad, Per
    Asymmetric Limit Cycles in an Industrially Applied Controlled Resonant Converter2009Conference paper (Refereed)
    Abstract [en]

    An industrially applied LCC power converter is modelled as a hybrid system. It is found that the hybrid system given a parameter set up and different initial conditions has three different limit cycles, one unstable and two asymmetric stable limit cycles. Effects of the asymmetric limit cycles are considered.

  • 5. Hultgren, Anders
    et al.
    Melin, Jan
    Ranstad, Per
    Limit cycle control of an industrially applied resonant converter modelled as a hybrid system2011Conference paper (Refereed)
    Abstract [en]

    Limit cycle control of an industrially applied high power, high voltage resonant power converter is modelled as a hybrid system. It is found that the hybrid system with three continuous states and one logic state given a parameter set up and different initial conditions has a rich solution set indicating possible problems in the industrial application. The solution set are one central closed trajectory and two asymmetric types of limit cycles.

  • 6. Hultgren, Anders
    et al.
    Melin, Jan
    Ranstad, Per
    Limit Cycles in an Industrially Applied Hybrid System2010Conference paper (Refereed)
    Abstract [en]

    An industrially applied LCC power converter is modelled as a hybrid system. It is found that the hybrid system with three continuous states and one logic state given a parameter set up and different initial conditions has among other solutions one central closed trajectory and two types of limit cycles, on the left and the right side. The other solutions are indicated.

  • 7. Hultgren, Anders
    et al.
    Nilsson, Magnus
    Kulesza, Wlodek
    Walther, Björn
    Integration av matematik och teknik på ingenjörsutbildningar2008Conference paper (Other academic)
    Abstract [sv]

    I detta bidrag presenterar vi en uppläggning av integrerade kurser i matematik och tillämpningar, vilken använts inom högskoleingenjörsutbildningen vid Högskolan i Kalmar. Kursverksamheten, som bedrivs inom ramen för kurspaketet ingenjörsvetenskap, tillgodoser såväl behovet av att betona matematikens roll som ett generellt och abstrakt verktyg för problemlösning som behovet av att ge studenterna bra baskunskaper i matematik i anslutning till möjliga tillämpningsområden.

  • 8. Karlsson, Magnus
    et al.
    Holmberg, Torbjörn
    Hultgren, Anders
    Lenells, Matz
    A Structural Modeling Flow for Switched Electrical Networks2009Conference paper (Refereed)
    Abstract [en]

    A structural flow for modeling of switched electrical circuits by means of an example a switched DC/DC converter will be presented. The modeling flow has a minimal amount of hand calculations and is suitable for script implementation in suitable mathematical computer software such as Matlab or similar. Switched Hamiltonian Differential Algebraic Equation models and Differential Equation models are obtained which are suitable for analysis in the time domain. Linear models, which can be transformed to the frequency domain for analysis, are obtained from the Hamiltonian models. The duty cycle will be included in the input vector enabling the full system analysis considering the system transfer functions audio susceptibility, output impedance, and control, i.e., the duty cycle to output voltage.

  • 9. Melin, Jan
    et al.
    Hultgren, Anders
    Lindström, Torsten
    Two types of limit cycles of a resonant converter modelled by a three-dimensional system2008In: Nonlinear Analysis: Hybrid Systems, ISSN 1751-570X, E-ISSN 1878-7460, Vol. 2, no 4, p. 1275-1286Article in journal (Refereed)
    Abstract [en]

    In this paper, the long-run dynamics of a controlled resonant converter, modelled as a piecewise system, is studied. The modelling of the resonant converter can be done using various approximations and the long-run dynamics of the two dimensional cases were earlier analysed. In this paper, we discuss results that can be extended to the three dimensional case. It seems that limit cycles describe the longrun dynamics in important situations in the three dimensional case, too. Our objective is to relate the limit cycles found previously in the two-dimensional case to those found now in the three dimensional approximation.

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