一种单级无桥SepicLLC变换器及其滑模控制  

Single-stage bridgeless SepicLLC converter and its sliding mode control

作　　者：徐玉珍[1,2] 万陆峰 金涛 萧展涛[1] XU Yu-zhen;WAN Lu-feng;JIN Tao;XIAO Zhan-tao(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;Fujian Key Laboratory of New Energy Generation and Power Conversion,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108 [2]福建省新能源发电与电能变换重点实验室,福建福州350108

出　　处：《电机与控制学报》2022年第9期77-88,共12页Electric Machines and Control

基　　金：国家自然科学基金(51977039);校科研启动基金资助项目(2019-IIFDKY-24)。

摘　　要：针对现有宽范围输入单级谐振电路易出现输出母线电容电压较大、功率因数和效率低的问题,提出一种基于无桥Sepic和LLC电路的单级交直变换器。混合控制策略(APWM-PFM)应用于单级谐振电路中存在响应速度慢、在稳定母线电压时变换器输入特性较差等问题,提出一种基于滑模APWM-PFM控制策略,在稳定输出电流时,使母线电压稳定在一定范围内和保持较好的输入特性。详细分析了所提电路的工作原理及其控制策略,最后研制了一台150 W的样机,仿真和实验结果表明:所提变换器及其控制策略实现了所有开关管的软开关和副边二极管的零电流关断,具有较好的性能;额定负载下,在输入电压185~265 V_(max)范围内,样机的功率因数均大于0.99,总谐波失真均在8%以下,具有较好的输入特性,最高效率为93.8%。Aiming at the problems of large output bus capacitor voltage, low power factor and low efficiency in existing wide-range input single-stage resonant circuits, a single-stage AC-DC converter based on bridgeless Sepic and LLC circuits was proposed. And the hybrid control strategy(APWM-PFM) applied to the single-stage resonant circuit has the problems of slow response speed and poor input characteristics of the converter when the bus voltage was stabilized. A sliding mode APWM-PFM control strategy was proposed to stabilize the output current. The bus voltage was stabilized within a certain range and maintains good input characteristics. The working principle and control strategy of the proposed circuit were analyzed in detail. Finally, a 150 W prototype was developed. Simulation and experimental results show that the proposed converter and its control strategy can realize the soft switching of all switching tubes and zero current shutdown of the secondary diodes, which has well performance;The power factor of the prototype is greater than 0.99 and the total harmonic distortion is below 8% under rated load within the input voltage range of 185-265 V_(max), which has good input characteristics, and the highest efficiency is 93.8%.

关 键 词：单级 无桥Sepic LLC变换器 滑模控制 母线电压 

分 类 号：TM46[电气工程—电器]