摘要
功率器件MOSFET作为开关电源主电路的一个重要组成部分,其可靠性备受关注。研究表明,在开关电源电路元器件失效率统计中,MOSFET失效率达31%。而MOSFET失效主要表现为导通电阻参数漂移,为了对MOSFET导通电阻参数进行在线辨识,以Buck电路为例,基于混杂系统理论构建Buck电路混杂系统模型,采用递推最小二乘法对模型中MOSFET导通电阻参数进行辨识,并在Simulink环境下进行仿真实验。实验结果表明,该方法对MOSFET导通电阻进行了有效的在线辨识,辨识相对误差小干5%,为MOSFET参数性故障的分析提供了理论依据和方法。
Power MOSFET is an important part in the main circuit of switching power supply. Its reliability has generated widespread concern. The study indicates that there are 31% faults by cause of MOSFET fault in the failure statistics of circuit components. The best indicators of MOSFET failure is on-resistance parameter drift. In order to realize the online identification of MOSFET on-resistance, Buck circuit is taken as an example, the hybrid model of Buck is constructed based on hybrid system theory. The method is presented to identify the pa- rameters by using recursive least square algorithm. A series of simulation experiments are conducted in the sim- ulink environment. The experimental results show that this method of identifying MOSFET on-resistance is valid and the on-resistance estimation error is less than 5 % compared with the default value. The results provide the theoretical basis and methods for the analysis of the MOSFET parameters failure.
出处
《测控技术》
CSCD
北大核心
2013年第6期119-123,129,共6页
Measurement & Control Technology
基金
国家自然科学基金资助项目(61070049
61202027)
国际科技合作计划项目(2012DFA11340)
北京市自然科学基金资助项目(4122015)
北京市教育委员会科技计划面上资助项目(KM201210028001)
关键词
开关电源
MOSFET
混杂系统
参数辨识
switching power supply
MOSFET
hybrid system
parameter identification
