A Capacitor-Cross-Connected Boost Converter With Duty Cycle <0.5 Control for Extended Conversion-Ratio and Soft Start-Up

作     者：Hu, Tingxu Huang, Mo Lu, Yan Martins, Rui P. 

作者机构：Univ Macau Fac Sci & Technol FST Dept Elect & Comp Engn ECEInst Microelect State Key Lab Analog & Mixed Signal VLSI Macau Peoples R China 

出 版 物：《IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS》 (IEEE Trans. Circuits Syst. Regul. Pap.)

年 卷 期：2022年第69卷第10期

页      面：4272-4283页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Natural Science Foundation of China Science and Technology Development Fund, Macau [145/2019/A3, SKL-AMSV(UM)-2020-2022] Research Plan of Shenzhen, Hong Kong, and Macau [SGDX20210823103805040] Research Committee of University of Macau [MYRG2020-00117-IME] 

主　　题：Boost converter hybrid dc-dc converter extended conversion ratio soft start-up 

摘      要：The series-capacitor boost converter (SCBC) requires a duty cycle (D) = 0.5 control, otherwise has issues of power switch overstress and inductor currents imbalance. Then, we cannot use the SCBC in wide conversion ratio (CR) applications that require CR = 0.5 control does not allow D to increase smoothly from 0 during startup, causing severe inrush inductor currents. As a solution, we propose two control schemes on the capacitor-cross-connected (CCC) boost converter, which is the symmetric version of the SCBC. With the proposed hard-charging control, the CCC converter allows D 0.5 without overstress or imbalance issues, thus extending the CR range and facilitating a soft start-up. In addition, we propose a soft-charging control that enhances the efficiency for 3 CR 4. We study the output impedance and CR expressions under these two types of controls. Finally, we propose a compact centrosymmetric floorplan that reduces the switching nodes ringing, verifying the proposed schemes with a 2.8-to-8.4-V input / 24-V output prototype converter. It exhibits a soft start-up with the proposed control. Under an 8-V input voltage and 1.5-A output current, the peak efficiency of the proposed hard-charging and soft-charging control is 94.7% and 96.3%, respectively.