One current adaptive switching strategy for DC/DC converter with spike limitation

The Journal of Engineering

Qunfang Wu¹  Qin Wang² 

[1] Department of Electrical and Electronics Engineering, College of Automation Engineering , Nanjing University of Aeronautics and Astronautics , Nanjing , People's Republic of China

关键词: adaptive switching strategy;    turn-on-turn-off current;    boost converter prototype;    power loop stray inductance;    drive circuit;    spike limitation;    switching loss;    power switch switching speed;    current-voltage spike;    switching transition;    power switch switching characteristics;    power 1 kW;    DC-DC converter;    voltage 380 V;   

DOI  :  10.1049/joe.2017.0148

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

In this study, a new current adaptive switching strategy with the spike limitation applied in DC/DC converter is proposed. With this switching strategy, the switching speed of the power switch can be regulated adaptively with the change of the load. The turn-on/turn-off current is inversely proportional to the load. So, at the light load, the switching speed of the power switch is faster and the switching losses are lower. In addition, all of the control should be based on one principle that the current/voltage spike across power switch under a smaller load cannot exceed that under a rated load. The switching characteristics of power switch with the proposed switching strategy and the relationship between current/voltage spike, turn-on/turn-off current and power loop stray inductance during the switching transition is discussed in this study. Moreover, the drive circuit is designed in detail. Finally, a boost converter prototype with 200 V DC input voltage/380 V output voltage/1 kW output power is established to verify the proposed method. The tested results show that the efficiency of the converter adopted the proposed method rises by 1.5% comparing with that used a conventional switching strategy at the light load.

【 授权许可】

CC BY