Low-Noise High Power Density Flying Capacitor Multi-Level Converters for Circuit Integration

飞天电容多电平变流器因其可以减小电容体积而适合于电路集成。在本研究中，详细分析了电容电压的行为，并提出了稳定电容电压的方法。阐明了产生电磁噪声的机理和降低电磁噪声的指标，建立了适合于电路集成的栅极驱动电路及其浮动电源的实现方案。在此基础上，构建了几种飞行电容多电平变流器的样机。样机实现了比最先进的两电平逆变器更高的输出功率密度。

Flying capacitor multi-level converters are suitable for circuit integration due to their possibility in reduction of size of capacitors. In this research, behavior of the capacitor voltage is analyzed in detail and a method for stabilizing the capacitor voltage is proposed. Furthermore, generation mechanism and guideline for reduction of electromagnetic noise are clarified, and an implementation of gate driver circuit and their floating power supply suitable for the circuit integration are established. Based on these investigations, several prototypes of the flying capacitor multi-level converter have been constructed. The prototypes have achieved higher output power density than state-of-the-art 2-level inverters.