Small-Signal Modeling and Load Transient Characteristic Analysis of Current Mode Controlled Tri-State Boost Converter
Zeng Shaohuan, Zhou Gouhua, Zhou Shuhan, Mao Guihua
Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of Education School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China
Abstract：To improve the load transient response speed, the current mode control technique was applied to tri-state boost converter, whose corresponding operation principle was analyzed in detail. On the basis of considering the influence of output current variation for the circuit performance, the whole small signal models for the current mode constant reference current (CRC) and current mode dynamic reference current (DRC) controlled tri-state boost converter were established respectively. Based on the models, the output impedances of the two control techniques were deduced respectively, which were verified through the simulation results in frequency-domain. Besides, the corresponding low-frequency gains of the output impedances were analyzed and compared. The research results indicate that, comparing with the current mode DRC control, the current mode CRC controlled tri-state boost converter has lower low-frequency gains, therefore it has faster load transient response speed. Finally, experiment results verified the theoretical analysis.
[1] Bari S, Li Q, Lee F C.A new fast adaptive on-time control for transient response improvement in constant on-time control[J]. IEEE Transactions on Power Electronics, 2018, 33(3): 2680-2689. [2] Wu K I, Hwang B T, Chen C C P. Synchronous double-pumping technique for integrated current-mode PWM DC-DC converters demand on fast-transient response[J]. IEEE Transactions on Power Electronics, 2017, 32(1): 849-865. [3] 许丽君, 沙金, 许多, 等. 开关DC-DC变换器电容电流脉冲序列控制[J]. 电工技术学报, 2016, 31(18): 100-107. Xu Lijun, Sha Jin, Xu Duo, et al.Capacitor current pulse train control for switching DC-DC converter[J]. Transactions of China Electrotechnical Society, 2016, 31(18): 100-107. [4] Sable D M, Cho B H, Ridley R B.Use of leading-edge modulation to transform boost and flyback converters into minimum-phase-zero systems[J]. IEEE Transactions on Power Electronics, 1991, 6(4): 704-711. [5] Viswanathan K, Oruganti R, Srinivasan D.A novel tri-state Boost converter with fast dynamics[J]. IEEE Transactions on Power Electronics, 2002, 17(5): 677-683. [6] 张斐, 许建平, 阎铁生, 等. 具有宽负载范围和低电压应力的三态反激PFC变换器[J]. 电工技术学报, 2015, 30(3): 123-130. Zhang Fei, Xu Jianping, Yan Tiesheng, et al.Tri-state flyback PFC converter with wide load range and low voltage stress[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 123-130. [7] 于海坤, 许建平, 张斐, 等. 具有宽负载范围的新型Boost功率因数校正器[J]. 电工技术学报, 2011, 26(12): 93-98. Yu Haikun, Xu Jianping, Zhang Fei, et al.A novel Boost PFC converter with wide load range[J]. Transactions of China Electrotechnical Society, 2011, 26(12): 93-98. [8] Viswanathan K, Oruganti R, Srinivasan D.Dual-mode control of tri-state boost converter for improved performance[J]. IEEE Transactions on Power Electronics, 2005, 20(4): 790-797. [9] Kapat S, Patra A, Banerjee S.A current-controlled tristate Boost converter with improved performance through RHP zero elimination[J]. IEEE Transactions on Power Electronics, 2009, 24(3): 776-786. [10] 崔恒丰, 周国华, 陈兴. 伪连续导电模式Buck变换器的动态参考电流控制策略[J]. 电工技术学报, 2017, 32(2): 246-254. Cui Hengfeng, Zhou Guohua, Chen Xing.Dynamic-reference-current control strategy for buck converter in pseudo continuous conduction mode[J]. Transactions of China Electrotechnical Society, 2017, 32(2): 246-254. [11] Zhou Gouhua, Xu Jianping, Wang Jinping.Constant-frequency peak-ripple-based control of buck converter in CCM: review, unification, and duality[J]. IEEE Transactions on Industrial Electronics, 2014, 61(3): 1280-1291. [12] 林天仁, 李勇, 麦瑞坤. 基于LCL-S拓扑的感应电能传输系统的建模与控制方法[J]. 电工技术学报, 2018, 33(1): 104-111. Lin Tianren, Li Yong, Mai Ruikun.Modeling and control method of inductive power transfer system based on LCL-S topology[J]. Transactions of China Electrotechnical Society, 2018, 33(1): 104-111. [13] 周国华, 许建平, 吴松荣. 开关变换器建模、分析与控制[M]. 北京: 科学出版社, 2016. [14] 高峡, 冯全源. 一种适用于基于纹波的恒定导通时间架构Buck变换器片内纹波补偿方案[J]. 电工技术学报, 2018, 33(4): 892-899. Gao Xia, Feng Quanyuan.An on-chip ripple compensation scheme for ripple-based constant on-time architecture Buck converter[J]. Transactions of China Electrotechnical Society, 2018, 33(4): 892-899. [15] 解光军, 徐慧芳. 峰值电流模式控制非理想Buck变换器系统建模[J]. 中国电机工程学报, 2012, 32(24): 52-58. Xie Guangjun, Xu Huifang.Modeling of current programmed mode non-ideal buck converter systems[J]. Proceedings of the CSEE, 2012, 32(24): 52-58. [16] Kondrath N, Kazimierczuk M K.Output impedance of peak current-mode controlled PWM DC-DC converters with only inner loop closed in CCM[C]//IEEE Industrial Electronics Society, Istanbul, 2014: 1679-1685. [17] 吴国营, 张波. 电流模式变换器的完整小信号模型及环路补偿[J]. 电工技术学报, 2008, 23(10): 83-87. Wu Guoying, Zhang Bo.Whole small signal model and compensation for regulators with current programmed mode[J]. Transactions of China Electrotechnical Society, 2008, 23(10): 83-87. [18] 王凤岩, 许建平. V2C控制Buck变换器分析[J]. 中国电机工程学报, 2006, 26(2): 121-126. Wang Fengyan, Xu Jianping.Modeling and analysis of V2C controlled Buck converter[J]. Proceedings of the CSEE, 2006, 26(2): 121-126. [19] Li Zhenhua, Zhou Guohua, Leng Minrui, et al.Fixed freewheeling-time control strategy for switching converter operating in pseudo-continuous conduction mode[C]//IEEE International Power Electronics and Motion Control Conference, Hefei, 2016: 2114-2119.
2019, Vol. 34 
