LLC resonant DC transformer (DCX) with parallel PWM output tight regulation
LLC resonant DC transformer (DCX) with parallel PWM output tight regulation
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DOI：
10.1109/ecce.2014.6954050
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Hui Chen;Xinke Wu
中科院分区：
文献类型：
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作者：
Hui Chen;Xinke Wu
提出了一种隔离谐振直流Transformer（DCX）并联输出调节方法。通过在初级侧与主Transformer串联且在次级侧独立的辅助Transformer，DCX产生额外的输出，该输出馈给级联PWM DC-DC转换器。由于DC-DC变换器的输出端与主输出端并联，因此输出电压由DC-DC级的占空比调节。在该拓扑中，大部分功率通过DCX的主Transformer传输到负载，只有一小部分功率通过两级DC-DC级联的DCX进行转换。因此，输出电压由PWM DC-DC级严格调节，并且转换效率几乎与传统LLC谐振DCX一样高。分析了该变换器的稳态工作原理，并在理论分析的基础上搭建了一台具有LLC-DCX和辅助Buck DC-DC级的样机。
This paper proposes a parallel output regulation method for isolated resonant DC transformer (DCX). With an auxiliary transformer in series with the main transformer at primary side and independent at secondary side, the DCX creates an additional output which feeds the cascaded PWM DC-DC converter. Because the output of the DC-DC converter is parallel with main output, the output voltage is regulated by the duty cycle of DC-DC stage. With the proposed topology, the major part power is delivered to load through the main transformer of DCX, and only small portion of power is converted by two-stage, DCX with cascaded DC-DC. Therefore, the output voltage is tightly regulated by PWM DC-DC stage and the conversion efficiency is almost as high as conventional LLC resonant DCX. The steady state operating principle of the proposed converter is analyzed, and a prototype with an LLC-DCX and an auxiliary Buck DC-DC stage is built-up based on the theoretical analysis.