摘要
提出了一种两级式可变母线电压的高压电容充电电源技术方案,该拓扑在半桥LLC谐振电路的基础上增加了一级图腾柱无桥功率因数校正(PFC)电路,通过改变母线电压来解决传统LLC谐振电源在输出更高电压时,工作频率变化范围过大带来的充电效率下滑的问题。由于图腾柱电路本身具备功率因数校正的功能,该电源设计还拥有能够直接从电网取电而不影响电网电能质量的优势。首先介绍了本电源设计中两部分的电路拓扑和工作原理,采用等效电阻法分析了电容负载下的电源输出特性。针对前级图腾柱电路设计了双环控制器以实现对母线电压和功率因数的控制,针对后级LLC电路提出了比例积分(PI)加低通滤波的恒流控制器以降低高频噪声带来的不利影响。最后通过模型构建与仿真分析,研究了高压电容充电电源3000 V/1 A时的充电特性,验证了本电源技术方案、设计和控制策略的可行性。
This paper proposes,a two-stage variable bus voltage high-voltage capacitor charging power supplytechnical scheme which adds a one-stage totem-pole bridgeless power factor correction(PFC)circuit on the basis ofthe half-bridge LLC resonant circuit,and solves the problem of the decline in charging efficiency caused by theexcessive operating frequency variation range of the traditional LLC resonant power supply when the output voltage ishigher.Since the totem-pole circuit itself has the function of power factor correction,the power supply design also hasthe advantage of being able to draw power directly from the grid without affecting the power quality of the grid.Thispaper first introduces the circuit topology and working principle of the two parts of this power supply design,andanalyzes the output characteristics of the power supply under capacitive load by the equivalent resistance method.Forthe pre-stage totem-pole circuit,a double-loop controller is designed to realize the control of bus voltage and powerfactors,and a constant current controller with proportional-integral(PI)plus low-pass filtering control is proposed forthe post-stage LLC circuit to reduce the adverse effects of high-frequency noise.Finally,through model constructionand simulation analysis,the charging characteristics of high-voltage capacitor charging power supply at 3000V/1 Aare studied,and the feasibility of the technical scheme,design and control strategy of the power supply is verified.
作者
曾宇轩
菲华•帕兰斯
于克训
谢贤飞
Zeng Yuxuan;Patrick J Palanas;Yu Kexun;Xie Xianfei(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《强激光与粒子束》
CAS
CSCD
北大核心
2024年第2期93-99,共7页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(52007072、51821005)。
关键词
图腾柱无桥功率因数校正
变母线电压
LLC谐振变换器
双闭环控制
恒流控制
高压电容充电
totem-pole bridgeless power factor correction
variable bus voltage
LLC resonant converter
dualclosed-loop control
constant current control
high voltage capacitor charging
作者简介
曾宇轩,zyx_yuxuan@foxmail.com;通信作者:谢贤飞,xxf88xxf@foxmail.com。
