单周期CRM PFC转换器的零交越失真优化设计

doi:10.3969/j.issn.1001-2400.2012.02.018

J4 ›› 2012, Vol. 39 ›› Issue (2): 108-113.doi: 10.3969/j.issn.1001-2400.2012.02.018

单周期CRM PFC转换器的零交越失真优化设计

李娅妮¹;杨银堂¹;朱樟明¹;强玮²;刘帘曦¹

(1. 西安电子科技大学宽禁带半导体材料与器件教育部重点实验室，陕西西安 710071;
2. 西安龙腾微电子技术发展有限公司，陕西西安 710065)

收稿日期:2011-03-04 出版日期:2012-04-20 发布日期:2012-05-21
通讯作者: 李娅妮
作者简介:李娅妮(1979-)，女，讲师，博士，E-mail: yanili@mail.xidian.edu.cn．
基金资助:
国家自然科学基金资助项目(60725415, 60971066);国家863计划资助项目(2009AA01Z258,2009AA01Z260);国家重大科技专项资助项目(2009ZX01034-002-001-005);西安应用材料创新基金资助项目(XA-AM-200814, XA-AM-201010)

Optimization of zero-crossing distortion in the CRM PFC converter with one cycle control

LI Yani¹;YANG Yintang¹;ZHU Zhangming¹;QIANG Wei²;LIU Lianxi¹

(1. Ministry of Education Key Lab. of Wide Band-Gap Semiconductor Materials and Devices, Xidian Univ., Xi'an 710071， China;
2. Xi’an Longtium Microelectronics Tech. Developing Co., Ltd, Xi'an 710065， China)

Received:2011-03-04 Online:2012-04-20 Published:2012-05-21
Contact: LI Yani

摘要/Abstract

摘要：

为降低总谐波失真提高电源效率，基于单周期临界导通功率因数校正(PFC)转换器，研究了零交越失真现象的优化设计方法．采用周期性自启动定时电路，不论电感电流是否下降到零，及时触发新的开关周期，以避免由于电感反向漏电所引入的导通延迟，从而降低了零交越失真和总谐波失真;在辅助绕组和振荡器之间引入可调分流电阻，对电感电流进行实时监控，调整振荡器输出波形斜率，以控制PWM关断时间，有效改善输入电压零交越点附近的失真现象．输入线电压频率越高，优化效果越好．在50Hz 220V_AC条件下，输入电流为120mA，输出功率为36W，测得优化后的PFC转换器总谐波失真(THD)仅为3.8％，功率因数为0.988，负载调整率为3％，线性调整率小于1％，效率达到97.3％．理论和测试结果均表明: 当交流输入线电压接近零值时，优化后系统的零交越失真及THD得到了有效降低，有效芯片面积为1.61mm×1.52mm．

关键词: 功率因数校正, 零交越失真, 单周期, 临界模式, 总谐波失真

Abstract:

To reduce the total harmonic distortion (THD) and increase power efficiency, based on a critical conduction mode (CRM) power factor correction (PFC) converter with one cycle control, the optimization of the zero-crossing distortion is discussed. The introduced periodic self-starting timer could provide a trigger signal to open a new cycle no matter whether the inductor current decreases to zero, thus avoiding the conduction delay produced by the reverse leakage current of the inductor with less zero-crossing distortion and THD. An adjustable shunt resistor connected between the auxiliary winding and the oscillator could regulate the output signal slope of the oscillator to control the PWM turn-off time by monitoring the inductor current of the auxiliary winding real time. It could effectively reduce the current distortion in the vicinity of the input voltage zero-crossing points. The higher the frequency of ac input line voltage, the better the optimization. At 50Hz 220V_AC, the input current is 120mA, the output power is 36W, the experimental THD of improved PFC converter is only 3.8％, the power factor is 0.988, the load adjust rate is 3％, the linear adjust rate is less than 1％, and the efficiency is 97.3％. Both theoretical and practical results reveal that the zero-crossing distortion and THD are reduced efficiently after optimization, especially when the ac line voltage is close to zero. The active die area is 1.61mm×1.52mm.

Key words: PFC, zero-crossing distortion, one cycle, CRM, THD

李娅妮;杨银堂;朱樟明;强玮;刘帘曦. 单周期CRM PFC转换器的零交越失真优化设计[J]. J4, 2012, 39(2): 108-113.

LI Yani;YANG Yintang;ZHU Zhangming;QIANG Wei;LIU Lianxi. Optimization of zero-crossing distortion in the CRM PFC converter with one cycle control[J]. J4, 2012, 39(2): 108-113.

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单周期CRM PFC转换器的零交越失真优化设计

Optimization of zero-crossing distortion in the CRM PFC converter with one cycle control

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