功率因数校正控制器过压保护电路的设计  

Design of over-voltage protection circuit for PFC controller

作　　者：徐静萍[1] 

机构地区：[1]西安邮电学院电子工程学院,陕西西安710121

出　　处：《西安邮电大学学报》2011年第S1期117-121,共5页Journal of Xi’an University of Posts and Telecommunications

基　　金：陕西省教育厅2010年专项科学研究项目(2010JK823)

摘　　要：针对功率因数校正(PFC)控制器内误差放大器电路带宽较窄(设计为100HZ)的特点,在芯片内部集成两级输出过压保护电路,能安全及时地处理芯片在启动时或负载断开时所引起的动态和静态过压情况。基于0.6um30VBCD工艺模型设计,采用Hspice软件仿真验证,0.7V的迟滞电压完全避免了电路在关断阈值电压附近产生"关断-导通"的振荡。该过压保护电路结构简单、面积小、功耗低,且具有良好的移植性。For the narrow bandwidth(100Hz) of error amplifier in the PFC controller,a two-step over-voltage protection circuit is designed,which enables to safely handle over-voltage in the chip start or the load disconnect conditions.The simulations have been completed by using software Hspice with the 0.6μm 30V BCD process.The results show that 0.7V hysteresis voltage avoided the circuit 'off-on' oscillations completely near threshold voltage.It has advantages of simple structure,low dispassion,small chip area,and it is easy to transplant.

关 键 词：PFC 过压保护 BCD 迟滞电压 

分 类 号：TM46[电气工程—电器]