Optimizing Method for Light-Load Efficiency of a H-Bridge Inverter Based on Variable Turn-Off Time Discontinuous Current Mode

被引：0
|
作者：
Lang T. [1 ]
Du S. [1 ]
Yin H. [1 ]
Hu H. [1 ]
机构：
[1] Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2020年 / 35卷 / 22期
关键词：
Discontinuous condition mode; Efficiency optimization; Light load; Micro-inverter; Variable turn-off time;
D O I：
10.19595/j.cnki.1000-6753.tces.191350
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
When the inverter operates in boundary current mode under light load, the switching frequency increases significantly, the switching loss increases greatly and the efficiency decreases significantly. To solve this problem, this paper proposes that when the inverter output power drops to the set value, the working mode is switched to discontinuous condition mode (DCM); and the switching time is changed according to the input voltage, output voltage and output power to reduce the switching frequency and switching losses of the inverters, thereby improving light-load efficiency. The working principle of the DCM mode with variable turn-off time is analyzed in detail and the theoretical calculation is deduced. In addition, considering the influence of parasitic parameters on inductor current, the quality of light-load current is improved by triggering the peak value of inductor current through hardware comparator. Its control strategy is also introduced. The simulation and experimental results show that the discontinuous current mode with variable turn-off time improves the efficiency by about 2% at light load and the quality of the output current is pretty good, which verifies the proposed method. © 2020, Electrical Technology Press Co. Ltd. All right reserved.
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收藏
页码：4761 / 4770
页数：9
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