一种双半桥三通道超宽增益LLC谐振变换器及其控制策略OA
A Dual Half-bridge Three-channel Ultra-wide Gain LLC Resonant Converter and Its Control Strategy
为了有效解决传统LLC谐振变换器在宽电压范围应用中,开关频率范围过宽引起环流损耗增加导致整体效率下降的矛盾,提出一种双半桥三通道拓扑结构的LLC谐振变换器.该变换器通过基于脉宽调制-脉频调制的混合控制策略构造出同步双通道模式、异步三通道桥式整流模式和异步三通道倍压整流模式3种工作子模态,并覆盖不同增益范围,从而实现超宽输出电压范围;对各模态下的工作原理、增益公式推导进行详细的分析;最后,设计并搭建一台具有15～150V宽范围直流输出电压、2 A额定输出电流的实验样机.实验结果表明,所提变换器在多模态运行中表现出良好的稳定性与调节能力,有效验证该拓扑结构的可行性及实际有效性.
To address the contradiction in traditional LLC resonant converters where a wide switching frequency range in wide voltage applications increases circulating current losses and leads to a decline in overall efficiency,an LLC resonant converter with a dual half-bridge three-channel topology is proposed.This converter employs a hybrid pulse width modulation-pulse frequency modulation(PWM-PFM)control strategy to establish three operating sub-modes:the synchronous dual-channel mode,the asynchronous three-channel bridge rectification mode,and the asynchronous three-channel voltage-doubler rectification mode.These sub-modes cover different gain ranges,enabling an ultra-wide output voltage range.The working principles under each mode and the derivation of gain formulas are analyzed in detail.Finally,an experimental prototype with an output voltage range of 15～150 V and a constant output current of 2 A is designed and built.Experimental results verify the feasibility and effec-tiveness of the proposed converter.
林昊;林国庆;林羽静
福建省新能源发电与电能变换重点实验室(福州大学),福建省 福州市 350116福建省新能源发电与电能变换重点实验室(福州大学),福建省 福州市 350116国网福建省电力有限公司信息通信分公司,福建省 福州市 350003
信息技术与安全科学
多模态切换超宽电压增益LLC谐振变换器三通道混合控制策略
multimode switchingultra-wide voltage gainLLC resonant converterthree-channelhybrid control strategy
《中国电机工程学报》 2026 (5)
2022-2032,中插23,12
福建省发改委科技项目(00389102)晋江市福大科教园区发展中心科研项目(2019-JJFDKY-37).Science and Technology Project of Fujian Provincial Development and Reform Commission(00389102)Jinjiang Science and Education Park Development Center Research Project(2019-JJFDKY-37).
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