Analysis and implementation of an isolated high step-down converter with interleaved output for low voltage applications,International Journal of Circuit Theory and Applications

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Analysis and implementation of an isolated high step-down converter with interleaved output for low voltage applications
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2022-07-27 , DOI: 10.1002/cta.3389
Sajad Ghabeli Sani ₁ , Mohamad Reza Banaei ₁ , Seyed Hossein Hosseini _{2,

3}

Affiliation

This paper proposes a new isolated high step-down dc-dc converter with a more extensive output range and high efficiency. The interleaved output and ZVS-ZCS switching for all semiconductors have made the converter appropriate for high output current applications. An auxiliary inductor is used to achieve the ZVS (zero-voltage switching) and ZVZCS (zero-voltage zero-current switching) condition, which charges and discharges the parallel snubber capacitors of the power switches at different modes of operation. Therefore, the switching losses of semiconductor components are reduced significantly, which results in enhanced efficiency. Moreover, the connection of an auxiliary capacitor in series with the transformer has prevented the probability of DC-current saturation. The proposed converter could be controlled with duty-cycle or switching frequency variations. However, the output voltage control with the switching frequency variations gives an extended range of output voltage compared with the other presented converters. Moreover, a coupled inductor is used to relate the output gain with the turn ratios, which causes a more extensive range for output voltage gain. Finally, the theoretical analysis is given and is compared with a 140 W experimental prototype, which converts a higher input voltage 300v to 7.5 V of the output voltage.

中文翻译：

用于低电压应用的具有交错输出的隔离式高降压转换器的分析与实现

本文提出了一种新型隔离式高降压型 DC-DC 转换器，具有更宽的输出范围和更高的效率。所有半导体的交错输出和 ZVS-ZCS 开关使该转换器适用于高输出电流应用。辅助电感器用于实现 ZVS（零电压开关）和 ZVZCS（零电压零电流开关）条件，它在不同的操作模式下对功率开关的并联缓冲电容器进行充电和放电。因此，半导体元件的开关损耗显着降低，从而提高效率。此外，与变压器串联的辅助电容器防止了直流电流饱和的可能性。所提出的转换器可以通过占空比或开关频率变化来控制。然而，与其他提出的转换器相比，具有开关频率变化的输出电压控制提供了扩展的输出电压范围。此外，耦合电感器用于将输出增益与匝数比相关联，这会导致输出电压增益的范围更广。最后，给出了理论分析，并与 140 W 实验样机进行了比较，该实验样机将较高的输入电压 300v 转换为 7.5V 的输出电压。这会导致更广泛的输出电压增益范围。最后，给出了理论分析，并与 140 W 实验样机进行了比较，该实验样机将较高的输入电压 300v 转换为 7.5V 的输出电压。这会导致更广泛的输出电压增益范围。最后，给出了理论分析，并与 140 W 实验样机进行了比较，该实验样机将较高的输入电压 300v 转换为 7.5V 的输出电压。

更新日期：2022-07-27

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