Wide input or output voltage range converters are required in various applications, including railway, industrial, military, aerospace, and many more. However, it has been challenging to achieve and maintain high efficiency under a wide range of input or output voltages of operation because of shifting operating conditions and compromised component selections required to cover a wide voltage range of operation. In this article, a method of reconfiguring the flying capacitor multilevel power conversion input stage is revealed for a wide voltage range of operation. A pulse voltage is produced by the input stage. With proper configuration under different input voltage levels, the voltage across key components, namely power switches, inductors, and capacitors, can be maintained relatively constant. In this way, components can be selected and optimized for very confined operating conditions. Also, the amplitude and frequency of the pulse voltage produced by the input stage are also maintained relatively constant. Therefore, a followed filter stage, a resonant tank, or an isolation + rectifier stage can be designed and operated with optimization. High and maintained overall efficiency are achieved over a wide change of the input voltage.

中文翻译：

---

宽输入电压范围变换器设计中飞跨电容多电平输入级的重构方法


各种应用都需要宽输入或输出电压范围转换器，包括铁路、工业、军事、航空航天等。然而，由于工作条件的变化以及覆盖宽工作电压范围所需的组件选择的折衷，在宽输入或输出工作电压下实现并保持高效率一直是一项挑战。在本文中，揭示了一种针对宽电压工作范围重新配置飞跨电容器多电平功率转换输入级的方法。输入级产生脉冲电压。通过在不同输入电压水平下的正确配置，关键组件（即功率开关、电感器和电容器）上的电压可以保持相对恒定。通过这种方式，可以针对非常有限的操作条件选择和优化组件。而且，输入级产生的脉冲电压的幅度和频率也保持相对恒定。因此，可以优化设计和运行后置滤波器级、谐振回路或隔离+整流器级。在输入电压大幅变化的情况下，可以实现高且维持的整体效率。