In a DC microgrid, while integrating the low voltage sources such as Fuel cells and photovoltaics, an efficient DC-DC converter is crucially needed. Contributing to a high voltage whilst being operated on a low duty ratio is among the demanded features of the converter. For high voltage applications, the conventional converters are to be operated beyond the prescribed range of the duty ratio which may result in various detrimental effects such as voltage spikes, increased current ripples, and reduced efficiency. In this paper, a voltage lift switched inductor double leg converter (VLSIDL) has been proposed. This novel converter has the feature of attaining a very high voltage without using any complex circuitry such as transformer, multiple voltage lift circuits, cascaded or parallel structure, etc. This particular converter has three switches that are operated in three modes with two different duty ratios. Double duty control offers flexibility in the selection of duty ratio for a particular output voltage and a significantly high gain is easily attained. The double duty ratio not only provides an extended range but also improves the efficiency and performance of the converter. The steady-state analysis of the proposed converter is done analytically and the same is verified through the hardware prototype.

中文翻译：

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适用于直流微电网应用的具有扩展占空比的升压开关电感器双桥臂转换器


在直流微电网中，在集成燃料电池和光伏等低压电源的同时，迫切需要高效的DC-DC转换器。在低占空比下工作的同时提供高电压是转换器的要求特征之一。对于高电压应用，传统转换器将在超出规定的占空比范围的情况下运行，这可能导致各种有害影响，例如电压尖峰、电流纹波增加和效率降低。在本文中，提出了一种升压开关电感双桥臂转换器（VLSIDL）。这种新型转换器的特点是无需使用任何复杂的电路（如变压器、多个升压电路、级联或并联结构等）即可获得非常高的电压。这种特殊转换器具有三个开关，可在具有两种不同占空比的三种模式下运行。双占空比控制为特定输出电压的占空比选择提供了灵活性，并且很容易获得相当高的增益。双占空比不仅提供了扩展的范围，而且还提高了转换器的效率和性能。对所提出的转换器进行了稳态分析，并通过硬件原型进行了验证。