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[Keyword] quasi-resonant converter(3hit)

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  • Inverting Quasi-Resonant Switched-Capacitor Bidirectional Converter and Its Application to Battery Equalization

    Yuang-Shung LEE  Yin-Yuan CHIU  Ming-Wang CHENG  Yi-Pin KO  Sung-Hsin HSIAO  

     
    PAPER-Energy in Electronics Communications

      Vol:
    E92-B No:4
      Page(s):
    1326-1336

    The proposed quasi-resonant (QR) zero current switching (ZCS) switched-capacitor (SC) converter is a new type of bidirectional power flow control conversion scheme. The proposed converter is able to provide voltage conversion ratios from -3/- (triple-mode/ trisection-mode) to -n/- (-n-mode/--mode) by adding a different number of switched-capacitors and power MOSFET switches with a small series connected resonant inductor for forward and reverse power flow control schemes. It possesses the advantages of low switching losses and current stress in this QR ZCS SC converter. The principle of operation, theoretical analysis of the proposed triple-mode/ trisection-mode bidirectional power conversion scheme is described in detail with circuit model analysis. Simulation and experimental studies are carried out to verify the performance of the proposed inverting type ZCS SC QR bidirectional converter. The proposed converters can be applied to battery equalization for battery management system (BMS).

  • Generalized Construction of ZCS Switched-Capacitor Bi-directional Converter

    Yuang-Shung LEE  Yin-Yuan CHIU  Ming-Wang CHENG  

     
    PAPER-Energy in Electronics Communications

      Vol:
    E89-B No:10
      Page(s):
    2913-2921

    The proposed zero-current switching switched-capacitor (ZCS SC) DC-DC converter is an innovative bi-directional power flow control conversion scheme. A zero-current switching switched-capacitor step-up/step-down bi-directional converter is presented that can improve the current stress problem during bi-directional power flow control processing. It can provide a high voltage conversion ratio of n/ (n-mode/-mode) using four power MOSFET main switches, a set of switched-capacitors and a small resonant inductor. Simulation and experimental results are carried out to verify the concept and performance of the proposed quadruple-mode/quarter-mode bi-directional DC-DC converter.

  • A Method Using an Averaging Technique for the Analysis and Evaluation of Real Quasi-Resonant Converters

    Yi-Cherng LIN  Der-Cherng LIAW  

     
    PAPER

      Vol:
    E89-C No:6
      Page(s):
    803-810

    A method using an averaging technique for the analysis and evaluation of real quasi-resonant converters (QRC's) is proposed in this paper. To reduce the great difference between the real characteristics and those of ideal circuits, a modeling technique is developed by considering the effect of parasitic power losses. Then, using the averaging approach reasonably simplifies the process of solving equations to obtain the steady-state solutions of state variables. Also, an updating algorithm is constructed to take all the power losses such as core losses, which are often absent in the conventional analysis, into account to improve the accuracy of the steady-state solutions. By these efforts, the evaluation of characteristics for QRC's is realized.