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Author: search.filters.author.Jangwanitlert, A.Subject: search.filters.subject.ZVZCS

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    A novel Zero-Current-Switching of leading and lagging-leg switches for full-bridge phase-shifted PWM DC-DC converter
    (2015-08-17)
    Songboonkaew, J.
    ;
    Jangwanitlert, A.
    This paper presents a novel Zero-Current-Switching(ZCS) technique of the leading and lagging-leg switches. The leading-leg switches are achieved under ZCS by using an active auxiliary circuit and the lagging-leg switches are achieved under the ZCS by using a blocking capacitor voltage in primary side for decreasing the primary current. Moreover, the leading-lag switches are still achieved under the ZVS condition by using the energy of the leakage inductance. In this paper, the DC-DC full-bridge converter operation is described. Experimental results provided from a 1 kW 30 kHz prototype and validated the feasibility.
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    Analysis of a wide load variation of ZVZCS phase-shifted PWM full-bridge DC-DC converter
    (2014-10-15)
    Jangwanitlert, A.
    This paper presents a wide load variation of the improved ZVZCS phase-shifted PWM full-bridge dc-dc converter, which can deliver power efficiently. The key operation waveforms of the full-bridge converter from absolutely no-load to full-load conditions are described. In order to confirm wide load variations, the converter should not only operate with soft-switching from full load to no-load condition with satisfactory efficiency for the full range of operation, but the voltage across the output diode bridge also needs to be clamped to keep away from any reverse voltage overshoots arising during turn-off of the output rectifying diodes. In order to achieve zero-voltage switching (ZVS) at turn-on for all load conditions, the converter employs auxiliary coupled inductors near lossless auxiliary circuit. Moreover, the proposed topology is based on a current driven rectifier in order to clamp the voltage of the output rectifying diodes and also obtain ZVZCS of the converter operation, resulting in superior efficiency for all load conditions. In this paper, the converter operation is described. Experimental results provided from a 1 kW prototype validate the feasibility.
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    An improved Three-Level Zero-Voltage and Zero-Current Switching PWM DC-DC converter for battery charger
    (2014-01-01)
    Jangwanitlert, A.
    This paper describes a 2-kW Three-Level Zero-Voltage and Zero-Current Switching (TL-ZVZCS) PWM dc-dc converter for battery charger. To solve the disadvantages from TL-Zero-Voltage Switching (ZVS) such as a circulating primary current and parasitic voltage ringing on the dual diodes rectifier, a proposed simple auxiliary circuit is composed of a small capacitor with two small diodes is put on the transformer secondary side to achieve ZVZCS conditions of primary switches and to clamp secondary voltage rectifier. The auxiliary circuit does not give any losses in components and additional active switches, which provides the proposed circuit converter more effective and efficient. Moreover, this paper describes the key operation waveforms, operational modes and design considerations. The concept idea is verified by the MATLAB simulation. © 2014 IEEE.