西安电子科技大学学报（自然科学版）2012，Vol.39Issue(2)：108-113,6.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
Optimization of zero-crossing distortion in the CRM PFC converter with one cycle control
摘要
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 50 Hz 220 VAC , the input current is 120 mA, the output power is 36 W, 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. 61 mm× 1. 52 mm.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Key words
PFC/ zero-crossing distortion/ one cycle/ CRM/ THD分类
信息技术与安全科学引用本文复制引用
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].西安电子科技大学学报（自然科学版）,2012,39(2):108-113,6.基金项目
国家自然科学基金资助项目(60725415,60971066) （60725415,60971066）
国家863计划资助项目(2009AA01Z258,2009AA01Z260) （2009AA01Z258,2009AA01Z260）
国家重大科技专项资助项目(2009ZX01034-002-001-005) （2009ZX01034-002-001-005）
西安应用材料创新基金资助项目(XA-AM-200814,XA-AM-201010) （XA-AM-200814,XA-AM-201010）
