This study proposes a high step-down DC-DC converter with minimum elements. In the proposed converter, soft switching condition is provided with only one auxiliary switch, which simplifies the structure of the converter. Leakage inductor energy is used to create a zero voltage condition; so the mutations created by this inductor are neutralised. The control of the auxiliary switch is complementary to the main switch, which does not require a new and complex control circuit. Due to low voltage gain, the proposed converter is suitable for use in voltage regulator modules. The proposed converter is completely analysed. To confirm the theoretical analysis, an experimental sample is made and tested at 15 W and the results are presented. Also, the efficiency of the proposed converter at full load is 97.5%.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
In this paper, a new zero voltage switching bidirectional DC-DC converter with low number elements is proposed. The synchronous rectification and soft-switching techniques are adopted to reduce the conduction loss and switching loss respectively. In the proposed converter any auxiliary circuits for providing soft switching conditions are not used, therefore the efficiency can be improved. In this converter the switches are gated with PWM signal and in complementary form, therefore the implementation of control circuit is simple. Since the proposed bidirectional DC-DC converter has only three main components with two snubber capacitors, the power density is very high. Simulation and experimental results verified the theoretical analysis and the efficiency of proposed converter in full load is about 96%.
A new zero voltage switching bidirectional DC-DC converter proposes in this paper. In the proposed converter, without adding any auxiliary switches and with a simple snubber, soft switching conditions are created, which simplifies the structure of the converter. The control of the switches in the proposed converter is complementary to each other, so the control circuit of the converter is simple and does not need any extra control circuit. The coupled inductors used in the converter, in addition to controlling the resonant inductor energy, transfer circulating currents to the input or output, which reduces the loss energy in the converter and increases the efficiency. The proposed converter is fully analyzed, and to verify the theoretical analysis, a 300-watt prototype of the converter is implemented and tested, resulting in an efficiency of about 95.5% at full load.
A new high step‐up DC–DC converter is proposed in this study. In the proposed converter with voltage lift technique and coupled inductors (CIs) a high voltage gain is achieved. Although the proposed converter has coupled inductors, the input current is continuous and the input current ripple is low. The proposed converter has only one switch and does not have any auxiliary switch, in which the control of the switch is easy. Soft switching condition is presented for the switch in the converter as zero current switching (ZCS) for turning on instant and zero voltage switching (ZVS) for turning off instant, in which the efficiency is increased. For all diodes expect two diodes in the converter ZCS condition is provided when diodes turn off that reverse recovery problem is solved for these diodes. The proposed converter is fully analyzed and described operation of it. To confirm theoretical analysis, 300 W of the proposed converter is implemented and tested, for which in full load an efficiency of 96.5% is achieved.
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