单相UPS的单开关AC-DC/DC-DC变换电路

Mono-switch AC-DC/DC-DC converter for single-phase UPS

介绍了一种应用在单相UPS系统中的新型单开关AC-DC/DC-DC变换电路,该电路由1个功率开关器件和6个二极管组成,能够实现AC/DC整流和DC/DC升压2种功能。在详细分析了该电路运行模式及工作原理的基础上,采用了单周期非线性控制理论对其进行控制,利于2个低速PI调节器对直流母线上的2个电容器电压进行控制,1个高速PI调节器对输入电流进行控制。仿真结果表明,该电路简单可靠,输入功率因数高,电流谐波失真小,可以获得稳定的正负直流母线电压。

A mono-switch AC-DC / DC-DC converter used in single-phase UPS system is introduced,which consists of one power switch and six diodes.As both AC-DC rectifier and DC-DC booster,its operating modes and working principle are detailed.The single-cycle nonlinear control is adopted,which applies two low-speed PI regulators to control the voltage of two capacitors on DC link and a high-speed PI regulator to control the input current.Simulative results prove that,being simple and reliable,it outputs stable DC bus voltage with high input power factor and low THD.