基于交流电路中功率因数的分析  

Analysis of the Power Ratio Based on AC Circuit

作　　者：冯向莉[1] 

机构地区：[1]陕西理工学院,陕西汉中723003

出　　处：《现代电子技术》2006年第20期102-103,共2页Modern Electronics Technique

基　　金：陕西理工学院教学改革研究项目(YJG0430)

摘　　要：在交流电路中,把电源所供给的有功功率与电源的视在功率之比称为功率因数即cosφ(电压电流相位差的余弦)。交流电路中的功率因数并非在任何情况下都是cosφ;以整流电路为例,列举几个电路实例,详细地推导出计算有功功率,视在功率及cosφ的正确表达式,并说明其物理意义。In AC circuit,the ratio of effective power and Volt power is called power ratio （the cosine of voltage and current）. But the ratio in AC circuit is not always cos φ Some examples of the commutating circuit are given in this article. By them, the correct expression of effective power, volt power, power ratio and is reasoned out in details. Further more, the physical meaning of the power ratio is explained distinctly.

关 键 词：整流电路 功率因数 有功功率 电源 

分 类 号：TN702[电子电信—电路与系统]