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Dynamic Level Changing for Full Range ZVS in Flying Capacitor Multi-Level Converters
IEEE Open Journal of Power Electronics Pub Date : 2022-08-22 , DOI: 10.1109/ojpel.2022.3200371
Margaret E. Blackwell 1 , Andrew Stillwell 2 , Robert C. N. Pilawa-Podgurski 1
Affiliation  

This paper presents a control technique for flying capacitor multi-level (FCML) converters to achieve zero-voltage switching (ZVS) across the full range of duty cycles, with application in high power density and high efficiency power converters. Previous works have used variable frequency control to enable ZVS at specific duty cycles in FCML converters, but have not been able to use these methods to enable ZVS across the full range. This work uses dynamic level selection and variable frequency control to increase inductor current ripple at duty cycle ranges for which ZVS was previously unattainable. An experimental 5-level FCML prototype has been built using GaN devices on a single-sided PCB to demonstrate this control technique. We demonstrate 4-level and 5-level operation with ZVS at duty cycles that are not possible with 5-level operation alone, as well as a dynamic level transition with active capacitor voltage balancing.

中文翻译:

飞电容多电平转换器中全范围 ZVS 的动态电平变化

本文介绍了一种用于飞跨电容器多电平 (FCML) 转换器的控制技术,以在整个占空比范围内实现零电压开关 (ZVS),并应用于高功率密度和高效率电源转换器。以前的工作使用变频控制在 FCML 转换器的特定占空比下启用 ZVS,但无法使用这些方法在整个范围内启用 ZVS。这项工作使用动态电平选择和可变频率控制来增加占空比范围内的电感电流纹波,而 ZVS 以前无法实现。在单面 PCB 上使用 GaN 器件构建了一个实验性 5 级 FCML 原型,以演示这种控制技术。我们演示了 ZVS 在占空比下的 4 级和 5 级操作,而单独使用 5 级操作是不可能的,
更新日期:2022-08-22
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