新型宽输出电压PFC电路的设计分析  

Design and Analysis of a new Power Factor Correction Circuit with Wide Output Voltage Range

作　　者：林维明[1] 汪晶慧[1] 邹剑华[1] 詹华[1] 

机构地区：[1]福州大学,福州福建350108

出　　处：《电力电子技术》2008年第7期29-30,42,共3页Power Electronics

基　　金：教育部留学回国人员基金项目资助~~

摘　　要：通常有源功率因数校正电路(PFC)具有恒定的输出电压,但HID灯在启动过程及整个寿命期,灯电压的变化很大。为了提高逆变电路输入输出的转换效率,减少逆变电路中电感的损耗,简化逆变电路的控制,需要PFC的输出电压跟踪灯电压的变化,因此设计新型宽输出电压范围的PFC电子镇流器是十分必要的。该镇流器结合Buck开关变换器和Boost开关变换器各自的特点,采用了分段变电路结构控制方法。为了减少开关损耗和功率二极管的反向恢复损耗,采用零电流开通的临界电流控制策略,实现了高输入功率因数。采用PFC级输出电压与灯特性匹配,且转换效率高的新型电子镇流器,具有电压应力低,使用开关器件少,电感导通损耗小,电感尺寸小的优点。实验结果验证了理论预期的正确性。Two switchable ballasts ,integrated Buck/Boost, are designed for power factor correction applications with wide output voltages.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 with discontinue conduction mode;（4）simple controller.Experimental results showed that the component current stresses and losses in the switchable ballast are significantly lower than those in conventional Boost or Buck converters.

关 键 词：镇流器 功率因数校正 电路/宽输出电压 

分 类 号：TM923.61[电气工程—电力电子与电力传动]