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

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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 E-mail:yanili@mail.xidian.edu.cn

Abstract

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

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

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