This paper presents the topology known as the isolated flying capacitor multilevel flyback converter (FCMFC). The topology uses isolated flying capacitors (FC) for high-gain, DC-DC power conversion while maintaining primary-secondary isolation and improving the efficiency and capability of a standard flyback transformer circuit. Three converters have been developed and tested, one flyback as a control, a 3 level FCMFC, and a 4 level FCMFC to prove the gain and efficiency benefits of this new topology. The FCMFC prototypes achieve higher gain and efficiencies relative to a flyback design utilizing the same off-the-shelf transformer. The stress of the input and output switches is reduced because of the fractioning of the output voltage across multiple output stages, allowing future iterations to utilize lower-rated components. The operating parameters are 5V to 40V boosting for a 10W load at 250kHz. Utilizing the same semiconductor components, the flyback converter control prototype achieves 78% efficiency while the proposed FCMFC converters reach 85% and 82% efficiency, even with the added isolated power, gate drive, and bootstrap circuitry. The FCMFCs have a multiplying effect on the gain of the traditional flyback which also increases near the 90% duty cycle flyback threshold. Additional testing was done at light load and at 100kHz, 250kHz, 452kHz, and 500kHz.

中文翻译：

---

隔离飞电容多电平转换器

本文介绍了称为隔离飞跨电容多级反激转换器 (FCMFC) 的拓扑结构。该拓扑使用隔离飞跨电容器 (FC) 进行高增益 DC-DC 电源转换，同时保持初级-次级隔离并提高标准反激变压器电路的效率和能力。已经开发和测试了三个转换器，一个作为控制的反激式、一个 3 电平 FCMFC 和一个 4 电平 FCMFC，以证明这种新拓扑的增益和效率优势。相对于使用相同现成变压器的反激式设计，FCMFC 原型实现了更高的增益和效率。由于跨多个输出级的输出电压分流，输入和输出开关的压力得以降低，从而允许未来的迭代使用额定值较低的组件。对于 250kHz 的 10W 负载，工作参数为 5V 至 40V 升压。使用相同的半导体元件，反激式转换器控制原型可实现 78% 的效率，而提议的 FCMFC 转换器的效率可达到 85% 和 82%，即使增加了隔离电源、栅极驱动和自举电路。FCMFC 对传统反激的增益具有倍增效应，在 90% 占空比反激阈值附近也会增加。在轻负载和 100kHz、250kHz、452kHz 和 500kHz 下进行了额外的测试。FCMFC 对传统反激的增益具有倍增效应，在 90% 占空比反激阈值附近也会增加。在轻负载和 100kHz、250kHz、452kHz 和 500kHz 下进行了额外的测试。FCMFC 对传统反激的增益具有倍增效应，在 90% 占空比反激阈值附近也会增加。在轻负载和 100kHz、250kHz、452kHz 和 500kHz 下进行了额外的测试。