高PF反激临界模式开关电源的环路设计  

Control loop design of flyback switch power supply with high PF operated in TM

作　　者：元倩倩[1] 

机构地区：[1]郑州大学,河南郑州450000

出　　处：《电子设计工程》2012年第12期120-123,共4页Electronic Design Engineering

摘　　要：目前开关电源市场上单端反激式的开关电源占有很大的份额,控制环路的设计是反激电源中关键的步骤之一。主要对基于L6561临界(TM)模式下高功率因数(PF)单端反激式开关电源的控制环路设计进行了论述,文中通过对环路中各级的传递函数进行了定性分析和定量计算,进而给出了环路的补偿电路。通过选择合适的相位裕量来保证系统的稳定性,并通过图解法验证了该环路可以使系统具有较好的稳定性。At present, the single-stage flyback switch power supply has shared a large percentage in today＇s market,the design of the control loop is one of the key steps in the design of the flyback switch power supply , this paper mainly discussed ： based on the L6561 control loop design of the single-stage flyback with high PF（power factor） switch power supply operated in the TM （transition mode）, in this paper, provides the transfer function of all levels in the loop and gives them the qualitative analysis and quantitative calculation, finally gives the compensation circuit of the loop. By selecting the right phase to ensure the stability of the system, and the test chart shows the loop can make the system has a good stability.

关 键 词：反激式电源 功率因数 控制环路 临界模式 

分 类 号：TN86[电子电信—信息与通信工程]