减小航空电源中输入电流谐波的方法

Single-Phase APFC Technique Applied to Aviation Power Supply

单相升压型PFC变换器由于其高功率因数、高效率在工业中得到了广泛的应用。但是在航空电网频率360Hz-800Hz时,输入电流过零畸变很严重,各次电流谐波含量很难满足航空系统提出的RTCA DO-160D标准。因此,传统的PFC控制系统设计并不能满足航空电源的要求。文中介绍了几种不同的控制方法和一种拓扑结构来改善输入电流过零畸变,并给出了它们的实现电路和方法,指出了各自的优缺点。通过比较这三种方法,得出电流相位超前补偿技术在工程应用中是最适合的方法,并且基于控制芯片UCC3817,设计制作了一台实验样机,实验结果证明了该方法的可行性。

Single-phase boost PFC converter has been widely used in industry due to its high power factor and high efficiency. But the input current distortion in the vicinity of input voltage zero crossing becomes very serious at airborne line frequency of 360 Hz-800 Hz, the current harmonic content is difficult to meet the RTCA DO-160D standards proposed by the aviation system. Therefore, the traditional PFC control system design cannot meet the requirements of airborne power supply. This paper introduces several different control methods and a topology to improve the input current zero-crossing distortion, and gives the corresponding circuit and methods, and point out respective advantages and disadvantages. By comparing these three methods, leading-phase admittance cancellation （LPAC） is the suitable method in engineering application, and based on control chip UCC3817, designed a laboratory prototype, experimental results show the feasibility of LPAC method.