基于混合控制模式的宽范围LLC谐振变换器设计  

Design of Wide-range LLC Resonant Converter Based on Hybrid Control Mode

作　　者：张杰[1] 张信 刘尉 杨淋 ZHANG Jie;ZHANG Xin;LIU Wei;YANG Lin(University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学太阳能高效利用及储能运行控制湖北省重点实验室,武汉430068

出　　处：《电源学报》2023年第3期10-19,共10页Journal of Power Supply

基　　金：湖北省技术创新专项重大资助项目(2019AAA018);湖北省重点研发计划资助项目(2020BBB084)。

摘　　要：为了提升LLC谐振变换器的输入电压范围,提出了一种混合控制的方式来提升LLC谐振变换器电路的增益。将整个控制分为3个模式,分别为全桥模式、半桥模式以及混合模式。在混合模式下,通过PI运算得出半桥LLC谐振变换器和全桥LLC谐振变换器分配的权重,控制信号由数字信号处理器DSP28335发出,让整个电路在控制周期的一定时间内工作在全桥LLC谐振变换器模式,其余时间工作在半桥LLC谐振变换器模式。前期通过分析和仿真,能够确定控制方式的最佳控制方案,最后通过一个输入50~150 V直流、输出12 V/5 A的实验样机,验证了所提控制方式的正确性和合理性。To improve the input voltage range of an LLC resonant converter,a hybrid control method is proposed to improve the gain of the LLC resonant converter circuit.The whole control is divided into three modes,i.e.,full-bridge mode,half-bridge mode and hybrid mode.In the hybrid mode,the distribution weights of a half-bridge LLC resonant converter and a full-bridge LLC resonant converter are obtained by PI calculations,and the control signals are generated by a digital signal processor DSP28335,so that the whole circuit can operate in the mode of the full-bridge LLC resonant converter within a certain time of the control cycle and in the mode of the half-bridge LLC resonant converter in the rest of the time.Through the analysis and simulations at an early stage,the optimal control scheme for the control mode can be determined.Finally,an experimental prototype with 50-150 V DC input and 12 V/5 A output was used to verify the correctness and rationality of the proposed control mode.

关 键 词：LLC谐振变换器 宽范围输入 混合控制 数字控制 

分 类 号：TM46[电气工程—电器]