This paper presents a two-mode controlled step-up inverter (TMCSI), which is capable of handling single or dual inputs with a wide range of dc input voltage. In comparison of the traditional multi-stage dc/dc power conversion system, the power conversion stage is reduced and the voltage/current stress of device are significantly alleviated without using high-voltage bus capacitors. As a result, the reliability and overall conversion efficiency are improved accordingly. By combining the two working modes, the proposed inverter achieves uniform distribution of duty ratio under single/dual-input with wide range input voltage, and is very suitable in the application of wide input voltage variation. Moreover, the dual-input inverter based on TMCSI with a novel power allocation method is also proposed to improve the system's load-bearing ability. The power allocation method is controlled separately from two working modes and allows the two-input sources directly supply the ac load simultaneously. In this paper, topology derivation, two-mode control strategy, characteristics of steady principle and design criteria for the key circuit parameters are systematically analyzed, and important conclusions are obtained. Finally, experimental results of the single/dual-input 500VA 96-192VDC input and 220VAC/50Hz output inverter prototype verify the effectiveness and advancement of the proposed method.

中文翻译：

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具有宽范围直流输入的双模式控制单/双输入 DC-AC 逆变器

本文介绍了一种双模式受控升压逆变器 (TMCSI)，它能够处理具有宽范围直流输入电压的单输入或双输入。与传统的多级dc/dc电源转换系统相比，在不使用高压总线电容的情况下，减少了电源转换级，显着减轻了器件的电压/电流应力。结果，相应地提高了可靠性和整体转换效率。通过结合两种工作模式，所提出的逆变器在宽输入电压范围内实现了单/双输入下占空比的均匀分配，非常适合宽输入电压变化的应用。此外，还提出了基于TMCSI的双输入逆变器，采用了一种新颖的功率分配方法，以提高系统的承载能力。功率分配方式与两种工作模式分开控制，允许两个输入源同时直接为交流负载供电。本文系统地分析了拓扑推导、双模控制策略、稳态原理的特点和关键电路参数的设计准则，得到了重要的结论。最后，单/双输入500VA 96-192VDC输入和220VAC/50Hz输出逆变器样机的实验结果验证了该方法的有效性和先进性。系统分析了关键电路参数的稳态原理和设计准则的特点，得到了重要的结论。最后，单/双输入500VA 96-192VDC输入和220VAC/50Hz输出逆变器样机的实验结果验证了该方法的有效性和先进性。系统分析了关键电路参数的稳态原理和设计准则的特点，得到了重要的结论。最后，单/双输入500VA 96-192VDC输入和220VAC/50Hz输出逆变器样机的实验结果验证了该方法的有效性和先进性。