A Novel Control Scheme for High PF Buck LED Driver With Reduced Compensation Capacitance

作     者：Yu, Dailing Xie, Xiaogao Dong, Hanjing 

作者机构：Hangzhou Dianzi Univ Key Lab IOT & Informat Fus Technol Zhejiang Prov Hangzhou Zhejiang Peoples R China Hangzhou Dianzi Univ Sch Automat Hangzhou Zhejiang Peoples R China Zhejiang Ind Polytech Coll Dept Elect & Elect Engn Shaoxing 312000 Peoples R China 

出 版 物：《IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS》 (IEEE J. Emerg. Sel. Top. Power Electron.)

年 卷 期：2023年第11卷第5期

页      面：4630-4642页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：National Natural Science Foundation of China 

主　　题：Light emitting diodes Capacitors Capacitance Estimation Voltage control System-on-chip Switching circuits Half-line-cycle step control high power factor (PF) Buck LED driver output current estimation reduced compensation capacitance 

摘      要：A novel control scheme for a high power factor (PF) Buck LED driver with a reduced compensation capacitor is proposed in this article. The proposed control scheme is composed of a novel output current estimation circuit based on an accumulator and a novel adaptive compensation circuit with a half-line-cycle step control. The proposed output current estimation circuit can achieve the information of the average output current by using the accumulator so that the capacitance of the capacitor in the RC filter can be reduced greatly. Meanwhile, the proposed adaptive half-line-cycle step control can further reduce the compensation capacitance greatly and increase the closed-loop bandwidth of the system under low input voltages. In this way, the control circuit can be fully integrated into a single chip with saved I/O pins and the dynamic response of the converter can also be improved. Detailed theoretical analysis has been presented and an 80-V/240-mA laboratory prototype of the high PF Buck LED driver was built up to verify the feasibility of the proposed control scheme.