全桥式开关电源电压暂降耐受特性预估与优化

Prediction and optimization of voltage sag tolerance characteristics of full-bridge switching power supply

开关电源因其集成度高、质量轻、效率高、功耗低等优点,被广泛用作家用和工业电子设备的工作电源或控制电源。开关电源是典型电压暂降敏感设备,电压暂降会影响其供电设备的正常工作,甚至造成巨大损失。围绕提升开关电源对电压暂降的耐受能力进行了研究,以全桥式开关电源为研究对象,在深入分析其工作原理和受暂降影响机理的基础上,提出了电压暂降耐受特性预估方法以及一种成本低、实现简单的开关电源参数优化方案,即通过优化高频变压器匝数比来增大开关管占空比的调节范围,以提升开关电源对电压暂降的耐受能力;最后利用PLECS平台的仿真结果以及工程应用实例验证了所提方案的有效性和适用性。

Switching power supply is widely used as the working or control power supply for household and industrial electronic equipment because of its high integration,light weight,high efficiency and low power consumption.However,switching power supply is a kind of typical device that is sensitive to voltage dip,and the voltage dip affects the normal operation and even causes enormous losses.Focusing on improving the tolerance of switching power supply to voltage dips,the full-bridge switching power supply is selected as the research object.Based on the in-depth analysis of its working principle and the mechanism affected by voltage dips,a prediction method of voltage dips tolerance characteristics and a low-cost and simple parameter optimization scheme of switching power supply are proposed,namely,by optimizing the turn ratio of highfrequency transformer,the adjustment range of the switching tube duty cycle is increased,so as to improve the tolerance to voltage dips.Finally,the PLECS platform simulation results and engineering application examples are used to verify the effectiveness and applicability of the proposed scheme.