摘要
为了提高Buck变换器的电磁兼容性能,基于混沌现象的宽频谱特性提出了一种新的变换器控制策略。本文首先详细推导了能够产生可控幅度混沌序列的Logistic映射形式,然后以峰值电流型滞环Buck开关变换器为研究对象,对其在混沌随机与常规周期两种工作模式下的时域和频域特性进行了对比分析,得出了混沌随机模式可以改善开关变换器的电磁兼容性的结论,但电感电流纹波却相应地增加了,从而降低了变换器的效率。仿真结果验证了理论分析。
A buck converter control scheme based on chaos is proposed, which can improves electromagnetic compatibility of buck power converters. Firstly an expression of logistic map is derived in detail, which can generated chaotic sequences with controllable ampli- tudes. Then the performance of chaotic operation of the peak-current hysteresis control mode converter in time domain and frequency domain was compared with that of the periodic operation. It is showed that electromagnetic compatibility of the chaotic random convertel is improved, the inductor current ripple increases and the efficiency degrades. The theoretical analysis is confirmed by the simulation results.
出处
《电源世界》
2008年第9期52-55,共4页
The World of Power Supply
关键词
混沌映射
变换器
电磁干扰
抑制
chaotic map converter electromagnetic interference reduce
