PWM开关电源控制电路的抗电磁干扰设计  

Anti-EMI Design for PWM Switched Mode Power Supply IC

作　　者：徐振邦[1] 居水荣[1] 席筱颖[1] 陈国金[1] 

机构地区：[1]江苏信息职业技术学院微电子学院,江苏无锡214153

出　　处：《电子器件》2017年第3期581-587,共7页Chinese Journal of Electron Devices

基　　金：江苏省教育厅项目(PPZY2015B190);江苏省教育厅"青蓝工程"科技创新团队项目

摘　　要：为提高开关电源控制电路的抗干扰性能,提出了3种设计方法。使开关电源控制电路工作在准谐振模式,并且控制与之配套使用的开关管在谷底导通,从而降低导通电流的尖峰值;通过采用"变频"技术,将开关电源中的电压和电流各次谐波的频带进行展宽,以降低高次谐波的幅度;通过限制开关管的电流,降低电流纹波。采用0.25μm 5 V/40 V BCD工艺设计了开关电源控制的电路SX1608,进行流片和封装测试,并将之应用在实际的开关电源中,经测试开关电源的电流纹波较小,抗电磁干扰能力较强。Three design ways are presented for SMPS IC in order to improve its anti-EMI performance. The switched MOSFET is conducted at the first valley and the peak conductive current is reduced when Quasi-Resonant operation mode is adopted for SMPS IC.Bandwidths of each current and voltage harmonic of SMPS are extended through the adoption of frequency changeable techniques,and the amplitude of higher harmonics is cut down.The ripple wave of current is reduced through the adoption of limiting switched current.The controller SX1608 is implemented in 0.25μm 5 V/40 V BCD process,and the test result shows that the anti-EMI performance is good,and the ripple wave of current is low.

关 键 词：集成电路设计 开关电源控制电路 抗电磁干扰 准谐振模式 谷底导通 “变频”技术 

分 类 号：TN432[电子电信—微电子学与固体电子学]