飞机直流母线变换器的关键技术研究

Study on Key Technologies of Aircraft's DC Bus Converter

针对飞机高压直流母线至低压直流母线变换的需求,对电源变换器的关键技术进行论述。采用倍流整流来满足大电流应用需求,采用外加延时电路来提高移相控制芯片的抗扰性,通过限制功率管并联电容的容量来抑制功率管的轻载损耗。通过对磁集成电感和分离电感的建模分析,确定分离电感更适合于倍流整流电路。通过对同步整流和肖特基二极管整流的对比分析,确定肖特基二极管整流在效率方面的劣势并不明显,但在可靠性方面的优势却较为显著。实测结果表明:电源变换器可实现4kW输出功率;对于倍流整流电路,采用分离电感的体积小于集成电感;相对于同步整流驱动易受干扰,肖特基整流可靠性更高。

Based on the application requirement of high voltage DC bus convert to low voltage DC bus in aircraft,the key technologies of converter is illustrated.The current doubler rectifier(CDR)is adopted to meet high current application,the external delay circuit is adopted to improve the immunity of the phase shift control chip,and the loss of the transistors is restrained by limiting the capacity of capacitors in parallel with transistors when under light load.By modeling and analyzing the magnetic integration inductor and discrete inductor,it is determined that discrete inductor is more suitable for CDR.Through the comparative of synchronous rectifier and Schottky diode rectifier,it is determined that Schottky diode rectifier has obvious advantage in reliability and slight disadvantage in efficiency.Experimental results verify that power supply converter can output 4 kW;the volume of discrete inductor is smaller than magnetic integration inductor in CDR;synchronous rectifier’s drive is susceptible to interference,and Schottky rectifier is more reliable.