摘要
变频空调系统需要调节压缩机转速,使制冷量连续变化,适应空调负荷的需要.为了满足输入电流谐波分量电磁兼容标准和进一步改进现有变频空调系统效率,需要研究一种宽输出电压变化的功率因数校正(PFC)电路.本文在分析比较主要开关变换器的基础上,提出采取低电压应力的Buck+Boost为主电路拓扑.本文进行宽输出电压变化PFC电路控制策略的分析比较,采用了先进的单周期非线性控制策略.新的空调电动机系统中,电动机输入电压的变化可以从PWM逆变器中转移到功率因数校正电路,即PFC的输出电压可以在宽的范围内变化,后级只需要简单的脉冲幅度调制PAM逆变器,其工作在低频范围,[频率可以根据负载变化],PAM逆变器占空比可以保持恒定,因此逆变器的电路和控制大大简化,同时实现逆变电路简单的控制.如此,可以减少整机成本并提高效率.同时,由于后级逆变器可以工作在低频频率,开关损耗和开关噪音可以进一步减少.计算机仿真和实验结果验证理论预期.
In this paper, integrated Buck/Boost, is described analyzed and designed for power factor correction applications in air conditioner motor system. The circuit can configure the converter to Boost topology at high output voltage and to Buck topology at low output voltage.Boundary conduction mode（BCM）is considered for both topological configurations for the following benefits： 1） Near resistive input characteristics; 2） smaller inductor sizes compared with continue conduction mode; 3） Lower switch current stress compared wioth discontinue conduction mode; 4） simple controller. Analytic and experimental results showed that the component current stresses and losses in the air conditioner motor system are significantly lower than those in conventional Boost or Buck converters. It is also shown that it is possible to share the same power stage component and the same control IC in the air conditioner motor system with guaranteed absolute stability.
出处
《河北工业大学学报》
CAS
北大核心
2009年第4期47-51,共5页
Journal of Hebei University of Technology
基金
国家自然科学基金项目(60572016)
