摘要
为了解决全桥LLC谐振变换器工作在轻载或空载时,输出电压不可控和损耗大的问题,提出了一种混合控制策略,当全桥LLC谐振变换器正常带载时采取PFM控制策略,轻载或空载时切换成PWM控制策略,提高了变换效率,稳定了输出电压,同时也降低了轻载或空载时的损耗。仿真结果表明:这种混合控制策略很好解决了LLC谐振变换器轻载或空载时输出电压不可控和损耗大的问题。
In order to solve the problem of uncontrollable output voltage and large loss in full bridge LLC resonant converter during light loads or no-loads output, a hybrid control strategy is proposed in this paper. The PFM control strategy is adopted when the full bridge LLC resonant converter is normally loaded, and the PWM control strategy is switched when the load is light or no load, which improves the conversion efficiency, stabilizes the output voltage, and reduces the loss of light load or no-load. The simulation results show that the hybrid control strategy can solve the problem of uncontrollable output voltage and large loss in full bridge LLC resonant converter during light loads or no-loads output.
出处
《电测与仪表》
北大核心
2017年第11期89-93,105,共6页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(U1610120)
安徽省自然科学基金资助项目(1508085ME88)
