单周期控制正负输出Boost PFC的研究

Research on a ±Output Boost PFC Topology with One-cycle Control Strategy

将单周期控制技术引入到一种新型的正负输出的功率因数校正(PFC)电路,该电路拓扑主要应用于半桥逆变结构的UPS系统。分析了其工作模式和原理,论证了使用单周期控制技术对系统进行控制的可行性。分析了输出电容不均压的原因,并提出了解决方法。最后给出了实验结果,证明该系统简单可靠,输入功率因数高,THD小,可以获得稳定的正负直流母线电压。

As a candidate topology for the front end converter in UPS systems,a novel ±output Boost PFC topology with one-cycle control strategy is presented.The operating principle and working modes of the topology are analyzed.And the application feasibility of the one-cycle control strategy in such PFC circuit is discussed.Then the reason of the output voltage un-balanee is analyzed,and some ways are proposed to resolve this problem.Finally,the experimental results show that the converter is simple and reliable, and it can realize balanced ±DC bus voltage with high input power factor and low THD.