单周控制新型Buck-PFC变换器

针对传统直接电流控制Boost-PFC变换器存在着输出电压高、检测量多、控制电路复杂等问题,提出了一种基于单周控制技术的新型Buck-PFC变换器。该变换器主电路拓扑结构新颖,控制电路简单,与传统的直接电流控制相比,不需要检测变换器输入和输出电压,去除了电压传感器和乘法器,响应速度快、精确度高。最后给出了变换器的仿真和实验结果,结果表明校正后功率因数接近1,总谐波失真度低,验证了所提出的变换器拓扑结构和控制策略的可行性和有效性。

One-Cycle Controlled Novel Buck-PFC Converter

Aimed at some drawbacks of high output voltage, more detection variables and complex control circuit for the conventional Boost-PFC converter, a novel Buck-PFC converter based on one-cycle control is presented. This converter has novel topology, simple control circuit, and in contrast to the traditional direct current control, no need to detect the input/output voltage of the converter, thus no need for the voltage sensors and multiplier, so fast response and high precision is gained. In this paper, the topology, operation principle and parameters design of proposed converter are analyzed in detail, finally the simulation and experimental results of this converter are given to show the power factor is close to unity and the total harmonic distortion (THD) is low. All analysis and results verify the feasibility and validity of the proposed converter topology and control strategy.