电力系统保护与控制2024，Vol.52Issue(3)：25-37,13.DOI:10.19783/j.cnki.pspc.230859
一种CC/CV平滑切换的宽输出电压充电电路
A charging circuit with wide output voltage and CC/CV smooth switching
摘要
Abstract
Recently,various types of power batteries,with advantages such as high energy density,long driving range,and recyclability,have been widely applied in the field of new energy vehicles.There are problems of output voltage range,smooth transition between modes,efficiency and so on,by applying various composite converters based on resonant circuit for battery charging.A four-switch Buck-Boost merged with capacitor-clamped LLC converter is proposed as a charging circuit.This circuit can operate in both the capacitive and inductive regions of the voltage gain curve.It exhibits constant current control characteristics in a wide frequency modulation range of the capacitive region,and constant voltage characteristics at the optimum resonant point in the inductive region.This is beneficial for achieving constant current and constant voltage control of batteries.Decoupling control of the frequency and duty cycle achieves a wider voltage gain range of the converter,and voltage gain of the converter is continuous under the continuous change of load impedance.This facilitates a stable and smooth transition for constant current and constant voltage charging batteries and implements the control schemes that are applicable to different battery charging.In addition,the wide control range at wide gain can reduce output ripple.The circuit has the features of phase-shifted soft-switching between the arms of the bridge,enhancing capability of soft-switching and reducing on-state current in the multiplex bridge arm,low magnetic flux transformer and ultimately moving to and working at the optimum resonant point.All these aspects facilitate achieving high-efficiency power transmission.It is verified by simulation and experiment that the charging circuit satisfies ZVS and ZCS in the whole process of constant current and constant voltage control,and smooth switching between charging modes.关键词
四开关Buck-Boost/电容钳位型LLC/恒流恒压充电/宽输出电压/软开关/平滑切换Key words
four-switch Buck-Boost converter/capacitor-clamped LLC converter/constant current and constant voltage charging/wide output voltage/soft-switch/smooth switching引用本文复制引用
鲁宜汶,李萍,刘国忠,赵峰,王久和..一种CC/CV平滑切换的宽输出电压充电电路[J].电力系统保护与控制,2024,52(3):25-37,13.基金项目
This work is supported by the National Natural Science Foundation of China(No.51777012). 国家自然科学基金项目资助(51777012) （No.51777012）
北京信息科技大学科研类分类发展重点研究培育项目资助(2021YJPY213) （2021YJPY213）
