一种提高原边反馈AC/DC恒流精度的方法  

High-Precision Constant Output Current Control for Primary-side Regulated AC /DC

作　　者：韩志超[1] 何均[1] 王荣[1] 许崇为 

机构地区：[1]西安电子科技大学电路CAD研究所,陕西西安710071

出　　处：《电子科技》2014年第9期169-171,共3页Electronic Science and Technology

摘　　要：针对传统原边反馈AC/DC由于峰值电流检测不准造成的输出恒流精度较低的问题,文中提出了一种应用于原边反馈的高精度恒流控制方法。该控制方法引入Ipk斜率检测来估计真正的原边峰值电流,以此提高输出恒流精度。通过LED驱动电路实验,验证结果表明,相比传统电路,此方法提高了恒流输出精度,在85～265 V输入电压范围下,恒流精度约为2%。A high-precision control strategy for the primary-side regulated AC /DC is proposed to deal with the low precision of constant current owing to the inaccurate peak current detection by the conventional primary-side regulated AC /DC. The control strategy estimates the real primary peak current by use of the slope detection of Ipkto improve constant output current precision. Experimental measurements of the LED driver circuits are presented to verify the performance of the proposed control strategy. The strategy improves constant output current precision and can achieve about 2% output current tolerance for 85 ～ 265 V input voltage range.

关 键 词：原边反馈 AC/DC 恒流精度 

分 类 号：TN432[电子电信—微电子学与固体电子学]