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Hybrid soft switching converter for DC grid applications

机译：混合软开关转换器，用于直流电网应用

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摘要

A new soft switched DC/DC converter with low circulating current loss in primary side and low voltage stress in secondary side is presented in direct current micro-grid applications. Modular full-bridge circuits with primary-series and secondary-parallel are used in the studied converter for high input voltage and load current applications. Therefore, the voltage stress of active switches in primary side and the current stress of rectifier diodes in secondary side are reduced. Thus, the low voltage rating switches are utilized to reduce the conduction loss. The input split voltages are balanced using flying capacitors connected between each circuit modular without the complexity control scheme. Phase-shift control is used to regulate the output voltage. Resonant circuit is connected to lagging-leg switches of full-bridge circuit in order to achieve soft switching at light load. The output voltage of resonant converter is connected to the secondary side in order to reset the primary current and clamp the voltage spike across the rectifier diodes at freewheeling state so that the circulating loss is improved. A laboratory prototype with 1.8 kW rated power is constructed and tested to verify the theoretical analysis. (C) 2017 Elsevier B.V. All rights reserved.
机译：在直流微电网应用中，提出了一种新型的软开关DC / DC转换器，其初级侧的循环电流损耗低，次级侧的电压应力低。在所研究的转换器中，具有初级串联和次级并联的模块化全桥电路用于高输入电压和负载电流应用。因此，减小了初级侧的有源开关的电压应力和次级侧的整流二极管的电流应力。因此，利用低电压额定值开关来减小传导损耗。使用连接在每个电路模块之间的快速电容器来平衡输入分压，而无需复杂性控制方案。相移控制用于调节输出电压。谐振电路连接到全桥电路的滞后腿开关，以便在轻载时实现软开关。谐振转换器的输出电压连接到次级侧，以重置初级电流并在续流状态下将整流二极管两端的电压尖峰钳位，从而改善了循环损耗。构建并测试了额定功率为1.8 kW的实验室原型，以验证理论分析。 （C）2017 Elsevier B.V.保留所有权利。

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