Method for Improving Loop Response Capability of Four Switch Buck-Boost Circuit

doi:10.16628/j.cnki.2095-8188.2021.01.006

Abstract

Abstract:

The common four switch Buck-Boost converter with multi-mode control operating mode switching control strategy is a single compensation method.The pole-zero point in Boost mode is used as the main basis for designing the compensation network,but the dynamic response performance in other operating modes is ignored.The method can only make the system have good stability and dynamic response performance within the input voltage range.In order to improve the overall stability and dynamic response speed of the system,a new mode switching compensation control strategy is proposed.The converter system is modeled by the energy conservation method and the average modeling method of switching elements.Open loop transfer functions of various modes are derived from the small signal model,and the compensation switching circuit is designed.Finally,simulation models and experimental circuits are built for research,which verify the feasibility of the proposed compensation method and improve the response ability of the loop.

Key words: four switch Buck-Boost converter, dynamic response, mode switching, stability, compensator

CLC Number:

TM46

CAI Yili, XU Yuzhen, ZHENG Qingliang. Method for Improving Loop Response Capability of Four Switch Buck-Boost Circuit[J]. LOW VOLTAGE APPARATUS, 2021, 0(1): 36-44.

Figures/Tables 11

工作模式		F_m	F_g	F_v
模式1	u_in<u_out	$f s M c + M 1 (1 - D 1)$	$D 12 + 2 D 1 + 2 D 2 2 L f s$	$(1 - D 2) 2 - 4 D 1 L f s$
	$u in =$ u_out	$f s M c + M 1 D 2 s$	$D 22 2 L f s$	$(1 - D 1) 2 2 L f s$
	u_in>u_out	$f s M c - M 1 (1 - D 1 - 2 D 2)$	$1.5 D 12 + D 1 L f s$ + $- D 2 + 2 D 1 D 2 L f s$	$2 D 1 (D 1 - 1 - D 2) L f s$ + $0.5 (1 - D 2) 2 L f s$
模式2		$f s M c + M 2 - M 1 (1 - D 1)$	$D 12 2 L f s$	$D 22 - 2 D 1 + 1 2 L f s$
模式3		$f s M c$	$D 12 2 L f s$	$1 - D 2 2 L f s$

References 11

[1]	徐洪伟. 开关电源在通信系统中的应用[D]. 呼和浩特:内蒙古大学, 2015.
[2]	顾亦磊, 黄贵松, 章进法. 一种适用于模块并联的同步整流驱动电路[J]. 中国电机工程学报, 2005,25(5):74-78.
[3]	YAN X W, WANG Y, GE X F, et al. Dual-loop control with input voltage feedforward for dual-switch Buck-Boost converter[J]. Electric Power Automation Equipment, 2016,36(19):65-70.
[4]	ZAINURI M A A M, RADZI M A M, SOH A C, et al. Development of adaptive perturb and observe-fuzzy control maximum power point tracking for photovoltaic Boost DC-DC converter[J]. IET Renewable Power Generation, 2014,8(2):183-194. doi: 10.1049/iet-rpg.2012.0362
[5]	JONES D C, ERICKSON R W. A nonlinear state machine for dead zone avoidance and mitigation in a synchronous noninverting Buck-Boost converter[J]. IEEE Transactions on Power Electronics, 2013,28(1):467-480. doi: 10.1109/TPEL.2012.2198924
[6]	AGOSTINELLI M, PRIEWASSER R, MARSILI S, et al. Fixed-frequency pseudo sliding mode control for a Buck-Boost DC-DC converter in mobile applications:A comparison with a linear PID controller[C]// 2011 IEEE International Symposium on Circuits and Systems (ISCAS), 2011:1604-1607.
[7]	MARIETHOZ S, ALMER S, MORARI M. Optimal control of a two control input Buck-Boost converter[C]// Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009:6575-6581.
[8]	康家玉, 陈旭阳, 刘甲琛. 基于四开关Buck-Boost的三模式平滑切换控制策略[J]. 科学技术与工程, 2019,19(33):193-199.
[9]	姚川, 阮新波, 曹伟杰, 等. 双管Buck-Boost 变换器的输入电压前馈控制策略[J]. 中国电机工程学报, 2013,33(21):36-44.
[10]	任小永. 高效率高功率密度通信模块电源技术的研究[D].南京:南京航天航空大学. 2008.
[11]	张玮麟, 刘东立, 张耀昌. 非理想Buck变换器建模与控制研究[J]. 电器与能效管理技术, 2020(7):25-28.

参数	数值
输入电压范围U_in/V	4~20
输出电压U_out/V	5
额定功率P_o/W	15
电感L/μH	3.3
输出瓷片电容C/μF	47×3
开关频率f_s/ kHz	500
输出电容等效电阻R_c/mΩ	5
电感R_L/mΩ	27
电阻负载R/Ω	5/3
占空比d_{1_max}	0.8
占空比d_{2_min}	0.15