This work targets reducing the mode transition time drastically, for two of the bidirectional DC–DC converters (BDCs) employed in energy storage systems, simultaneously proposing a smooth start-up process. Two different mode transition techniques are introduced for topology A (proposed) and topology B, respectively, whose transition times are much smaller than the existing transition techniques. Topologies A and B are capable of performing all basic converter operations, i.e. buck, boost, inverting buck–boost and non-inverting buck–boost in bidirectional mode, which allows the operating voltage ranges of both V ₁ and V ₂ to be increased perceivably. Both topologies are compared based on mode transition methodology, stress on the converter switches, inductor size and rating. A start-up technique is also advocated for both topologies so that the start-up response could be smooth. Two 400 W BDCs are designed with voltage levels of 60 and 120 V and experimentally verified for efficient start-up, mode transition and steady-state operations. Both mode-transition techniques proposed here, take 2 μs for the current reversal on the battery side from +5 to −5 A.

中文翻译：

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具有新颖的启动和模式转换技术的具有多转换器功能的非隔离双向DC-DC转换器

这项工作的目标是为储能系统中使用的两个双向DC-DC转换器（BDC）大幅减少模式转换时间，同时提出一个平稳的启动过程。分别为拓扑A（建议的拓扑）和拓扑B引入了两种不同的模式转换技术，它们的转换时间比现有的转换技术小得多。拓扑A和B能够在双向模式下执行所有基本的转换器操作，即降压，升压，反相buck-boost和同相buck-boost，这允许两者的工作电压范围V ₁和V ₂明显增加。根据模式转换方法，转换器开关上的应力，电感器尺寸和额定值比较这两种拓扑。对于这两种拓扑，还提倡一种启动技术，以便启动响应可以平稳。设计了两个400 W BDC，其电压电平分别为60和120 V，并经过实验验证，可以有效地启动，模式转换和稳态操作。此处提出的两种模式转换技术都需要2μs的时间才能将电池侧的电流从+5 A改为-5A。