基于正弦波扰动实现Buck型变换器混沌反控制

Chaos anti-control of Buck converter based on sine wave disturbance

依据混沌现象可以用来降低开关模式电源的电磁干扰的原理,通过引入外部正弦波信号去扰动反馈电压,使Buck变换器工作在混沌状态,进而改善频谱分布,降低谐波上频谱峰值.仿真结果表明:该控制方法能够有效地实现Buck型变换器的混沌反控制,降低电磁干扰.

Chaos phenomenon has been used to decrease EMI （electromagnetic interference） of SMPS （switch-mode power supplies）. By introducing a sine wave to disturb the feedback voltage, Buck converters can work at chaotic state so that power spectrum of inductance current is improved, the peak values at switching frequency and its harmonics are reduced. Simulation results illustrated that this control strategy can realize chaos of Buck converter and decrease the level of EMI .