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    Wyświetlanie 1-4 z 4
    Tytuł:
    Power transfer analysis in a single phase dual active bridge
    Autorzy:
    Barlik, R.
    Nowak, M.
    Grzejszczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/201137.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bidirectional active bridge - DAB
    power losses
    shift phase modulation
    Opis:
    This paper presents an analysis of the power transfer between two DC circuit by use a single phase galvanically isolated dual active bridge - DAB. The analytical description of instantaneous values of the currents in both DC and in AC circuits of the DAB is done. The influence of the dead time as well as voltage drops across the transistors and diodes of the bridges is examined. The different relations between voltages of the DC circuits coupled through DAB and various phase shift ratios are considered. The analytical relations describing the average values of the currents in DC circuits are derived. These currents can be used to predict the power in both DC circuits and power losses generated in semiconductor devices of the converter. It is assumed that the voltage drops across these devices in conduction states are constant. The calculation of the transferred power as well as power losses and energy efficiency for the DAB converter power rated 5600 VA which is used to energy transfer between DC circuits 280 V and 51 V±20% is presented. The proposed relations and calculation results can be useful for preliminary evaluation of power losses generated in semiconductor devices and for design of the cooling system. Due to the high switching frequency of 100 kHz, the phase shift modulation for the control of DAB is used. To validate the theoretical investigations a few experimental results are presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 809-828
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of power losses in a high-frequency planar transformer using a thermal camera
    Autorzy:
    Barlik, R.
    Nowak, M.
    Grzejszczak, P.
    Zdanowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140759.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power losses estimation
    thermal camera
    thermal calibration
    planar transformer
    Dowell’s and Steinmetz’s equations
    Opis:
    This paper presents the implementation of a thermal camera for the quantitative estimation of power losses in a high frequency planar transformer (100 kHz/ 5600 VA). The methodology is based on the observation of the transient temperature rise and determination of the power losses by means of curves representing the derivative of temperature as a function of power losses dissipated in the transformer. First, the thermal calibration characteristics had to be obtained from a simple experiment, where power losses are generated by DC current in the ferrite core and windings. Next, experimental investigations focused on the determination of the transformer power losses for a short circuit and no load, with a resistive load and with the rectifier as a load were carried out. Finally, to verify the obtained results, analytical calculations based on Dowell’s and modified Steinmetz’s equations were additionally made, which showed a good convergence. The proposed method is easy to implement and can be used as an alternative to the calorimetric method which is time-consuming and requires a complicated measurement setup.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 3; 613-627
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digitally controlled interface between supercapacitor energy storage and DC link
    Autorzy:
    Nowak, M.
    Hildebrandt, J.
    Rabkowski, J.
    Barlik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/262750.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    supercapacitor energy storage
    DA-AC-DC converter
    digital control
    Opis:
    In the paper specification of a complex converter designed as an interface between a supercapacitor energy storage battery and other DC auxiliary links, with emphasis on its control system, and some laboratory investigation results, is presented. The converter applied in the solution contains a DC/DC power controller and a DC/AC/DC medium frequency intermediate link with a transformer, permitting good voltage matching. Specific control of both cooperating converters in accordance with the proposed solution gives the possibility of synchronized and phase controlled operation of DC/DC and DC/AC converters resulting in the impact on the AC current wave shape. In this way AC link switching and conducting loss minimize and improving of interface efficiency have been emphasized.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 27-31
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical description of power losses in a transformer operating in the dual active bridge converter
    Autorzy:
    Barlik, R.
    Nowak, M.
    Grzejszczak, P.
    Zdanowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200805.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    core losses
    winding losses
    ferrite
    planar transformer
    Steinmetz’s equation
    Dowell’s model
    dual active bridge
    straty rdzenia
    straty uzwojenia
    ferryt
    transformator
    równanie Steinmetza
    model Dowella
    Opis:
    The paper presents an analytical approach to the determination of power losses in a high-frequency transformer operating in the dual active bridge (DAB). This transformer, having two single-phase transistor bridge inverters, couples two DC circuits that significantly differ in voltages (280 V and 51 V ±20%). Power losses in the core and windings of the planar transformer 5600 VA /100 kHz were calculated taking into account changes in the value and direction of the energy flow between the coupled DC circuits. These circuits represent storage or renewable energy sources and intermediate circuits of the converters used in distributed generation systems. Calculations were performed using the Steinmetz’s and Dowell’s equations. The analytical results have been verified experimentally.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 561-574
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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