In this article, two configurations of the quadratic quasi-Z-source (Q-qZS) isolated dc–dc converters are presented, namely continuous input current and discontinuous input current configurations. The operating principles and steady state of the continuous input current topology analyzed in this article is characterized with the following features: 1) wider operating range due to buck and boost functions in a single stage; 2) draws continuous input current; 3) low input current ripple compared with other qZS-based isolated dc–dc converters; 4) better reliability and good immunity against EMI noise; 5) common ground between the input source and the inverting bridge; and 6) continuous control over the entire operating range. Compared with other qZS-based isolated dc–dc converters, lower current stresses on active and passive components used are realized. Hence, the total magnetic volume/energy required by the proposed converter is reduced with the potential of achieving high power density. A prototype of 40–140 V input voltage, 300 V output, and 550 W rated power is developed to validate the performance of the proposed converter presented.

中文翻译：

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适用于宽输入应用的高可靠性二次准 Z 源全桥隔离式 DC-DC 转换器

本文介绍了二次准 Z 源 (Q-qZS) 隔离式 DC-DC 转换器的两种配置，即连续输入电流配置和不连续输入电流配置。本文分析的连续输入电流拓扑的工作原理和稳态具有以下特点：1）由于单级降压和升压功能，工作范围更广；2) 汲取连续输入电流；3) 与其他基于 qZS 的隔离式 DC-DC 转换器相比，输入电流纹波低；4) 更好的可靠性和良好的抗EMI噪声能力；5) 输入源与反相桥共地；6) 对整个操作范围的连续控制。与其他基于 qZS 的隔离式 DC-DC 转换器相比，实现了对使用的有源和无源元件的较低电流应力。因此，所提出的转换器所需的总磁体积/能量随着实现高功率密度的潜力而降低。开发了一个 40-140 V 输入电压、300 V 输出和 550 W 额定功率的原型，以验证所提出的转换器的性能。