新电磁兼容标准条件下的功率因数校正电路的设计分析

电磁兼容标准是强制性的,因此满足特定的电磁兼容标准是功率因数校正技术研究的重要内容.低成本小功率的开关电源设计以满足电磁兼容标准为目标,电流谐波限制标准的要求不同对于电路的设计有很大的影响.由于IEC1000-3-2电磁兼容标准的变化,许多过去标准中划分为D类装置设备在新版本标准中划分为A类,通过分析计算,按照新标准重新计算的开关电源磁元件尺寸可大幅度地减小,进一步降低成本和提高性能价格比.本文以有源单级功率因数校正电路和无源LC功率因数校正电路为例,对新电磁兼容标准条件下功率因数校正电路进行设计分析.实验结果与理论预期十分接近.

Design and analysis of power factor correction circuits to comply with new version of regulations

The design of low-cost power supplies is influenced by the regulations on the low-frequency harmonic content in the line.As IEC 1000-3-2 regulations have just been modified,the design procedure of low-cost power supplies should also be modified.According to the new version of the above-mentioned regulations,many power supplies classified as Class D in the past are classified as Class A now.This fact allows a remarkable saving in the size of the reactive elements used to reduce the line harmonics if they have been properly designed.The minimum values of the magnetic elements used in two well-known PFC solutions(one is an S*PFC and the other is a passive filter) have been obtained in this paper for equipment classified in both the new Class A and the new Class D and for any power level between 75W and 600W.