【摘要】 提出了一种高效率高功率密度的飞跨电容逆变器的设计方法。与传统的两电平逆变器相比，飞跨电容拓扑利用具有高能量密度的电容器来帮助电感器在转换过程中存储和转移能量，这带来了诸如减小开关管的电压应力、减小电感上的电压应力以及增大电感电流的纹波频率等特征。为了在实现高效率的基础上，同时实现高功率密度。首先基于NFOM模型选择合适的电平数来满足效率的指标要求，然后基于电路原推导了电感电流纹波和飞跨电容工频纹波的数学表达式，根据电感电流纹波和飞跨电容工频纹波的最大值来选择电感和电容值，最后搭建了一台峰值效率为99%,功率密度为1284W/in3的七电平飞跨电容逆变器，并通过实验验证了设计方法的有效性。更多还原

【Abstract】 This paper presents a design method of flying capacitor inverter with high efficiency and high power density.Compared with the traditional two-level inverter, the FCML topology utilizes high energy density capacitors to facilitate inductors with storing and transferring energy during the conversion process, which brings characteristics such as reducing the voltage stress of the switching tube, reducing the voltage stress on the inductor and increasing the ripple frequency of the inductor current.In order to achieve high efficiency and high power density at the same time.In this paper, firstly, based on NFOM model, the appropriate number of levels is selected to meet the efficiency requirements.Then, based on the circuit principle, the mathematical expressions of inductor current ripple and flying capacitor power frequency ripple are derived, and the inductor and capacitor values are selected according to the maximum values of inductor current ripple and flying capacitor power frequency ripple, Finally, a seven-level flying capacitor inverter with peak efficiency of 99% and power density of 1284W/in3 is built, which verifies the effectiveness of the design method.更多还原