Design of wide input voltage range high step-up DC-DC converter based on secondary-side resonant tank full bridge LLC

2018 3rd International Conference on Intelligent Green Building and Smart Grid (IGBSG) Pub Date : 2018-04-01 DOI:10.1109/IGBSG.2018.8393557

A. Rahman, H. Chiu, Y. Hsieh

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引用次数: 13

Abstract

Battery are widely utilized in uninterruptible power supply (UPS) to provide the power temporarily during power failure. In applications up to a few kilo watts, low voltage battery stack are typically used since it is not economically feasible to use high voltage battery stack in such application. To interface the battery to the dc-link of the UPS, power electronic converter are widely used. Due to the wide voltage variation at battery terminal that are mainly caused by battery state of charge and battery stack current, power converter for battery application are required to be capable to interface with wide battery voltage range. In this paper, a wide input range high step up converter was designed based on LLC converter. To significantly reduce the resonant capacitor current, secondary side resonant tank LLC converter was proposed. Finally, a 2 kW prototype was designed for 36 V∼ 72 V input voltage and 410 V output voltage, built, and from experimental test 93.59% peak efficiency was measured.

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基于二次侧谐振槽全桥LLC的宽输入电压范围高升压DC-DC变换器设计

蓄电池广泛应用于不间断电源(UPS)中，用于在停电时提供临时电源。在高达几千瓦的应用中，通常使用低压电池组，因为在这种应用中使用高压电池组在经济上是不可行的。为了将电池连接到UPS的直流链路上，电力电子变换器被广泛使用。由于电池端电压变化很大，主要是由电池的充电状态和电池堆电流引起的，因此电池应用的电源转换器需要能够与宽电压范围的电池接口。本文设计了一种基于LLC变换器的宽输入范围高升压变换器。为了显著减小谐振电容电流，提出了二次侧谐振槽LLC变换器。最后，在36 V ~ 72 V的输入电压和410 V的输出电压下，设计了一个2 kW的样机，并建立了，从实验测试中测得93.59%的峰值效率。

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2018 3rd International Conference on Intelligent Green Building and Smart Grid (IGBSG)

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