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Author: search.filters.author.Kongwirat, ThammachatSubject: search.filters.subject.ZVZCS

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    Evaluation of a three-phase three-level ZVZCS DC-DC converter using phase-shift PWM strategy
    (2017-09-01)
    Kongwirat, Thammachat
    ;
    Jangwanitlert, Anuwat
    This paper presents the evaluation of a three-phase three-level DC-DC converter which achieves the soft switching condition for all switches in the circuit and uses the phase-shift PWM strategy to adjust electric power at the output side. According to the analysis, the operation modes can be categorized into two cases: in the first case, where the phase shift angle is less than 120 degrees and in the second case, where the phase shift angle is more than 120 degrees. The outer switches of the circuit operate under ZVS condition and the inner switches operate under ZVZCS condition. It has been discovered that under ZCS condition of the inner switches, when the blocking capacitors decrease, they make the voltage across the blocking capacitor higher so the current reduce rapidly. A three-phase three-level DC-DC converter has a maximum efficiency of 93.5% when its load is of 5.7 kW. The results from the experiment have been compared to the results obtained by the MATLAB® simulator in order to confirm the validity of the proposed converter.
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    Analysis of reset time for a novel three-phase three-level ZVZCS DC-DC converter using phase-shift PWM strategy
    (2015-01-26)
    Kongwirat, Thammachat
    ;
    Jangwanitlert, Anuwat
    The paper presents an analysis about the reset time of the primary current for a novel three-phase three-level ZVZCS DC-DC converter using phase-shift PWM strategy. The analysis shows the presence of the ZVS turn-on condition at outer switches of Branches A, B and C, ZVZCS turn-on and turn-off conditions at inner switches of the branches. For ZCS turn-off conditions at inner switches, DC blocking capacitors also affects resetting of the primary current directly and validates the consistency between simulation results using MATLABR and experimental results, which exhibits good agreement. The converter has maximum efficiency of 93.50% at 5.6 kW.