抽头电感单级升压逆变器的无源网络设计与参数极限值估计

Impedance Network Design and Its Critical Value Estimation of a Tapped-inductor Single-stage Boost Inverter

分析提出的抽头电感单级升压逆变器所有可能的运行状态,揭示在一个直通周期内,除了期望的3种运行状态外,还存在4种对能量传递过程不起作用,甚至给电路运行造成一定危害的运行状态。这4种运行状态可通过合理设计电感和电容值加以避免。从稳态分析中得到描述电路运行的状态方程组,展示能准确设计无源网络的方法,使其运行于期望的直通和非直通状态。提供的方法还可估计电感和电容的极限值,避免电路出现不正常的运行状态。仿真和实验验证了该设计方法的有效性和精确性,同时展示了当电感和电容低于极限值时出现的不正常运行状态。

This paper presents all the possible steady states of the tapped-inductor single-stage boost inverter proposed. It is shown that, in addition to the desired three steady states, an operating cycle can contain another four abnormal states that do not contribute to the power conversion process. These four states can be avoided by selecting suitable value of the capacitors and inductors. By using the equations derived from the steady-state analysis, this paper also presents guidelines to design the impedance network accurately for the case when the inverter is operated only in the desired active and shoot-through states. The proposed design method can also be used to estimate the critical values of capacitance and inductance, in order to avoid those four states appearing during the operating cycle. Experiments are used to verify the design method and to demonstrate the appearance of the four states when the capacitors and inductors are smaller than their critical values.