We take current - controlled dc / dc boost converter with feedback as a computer simulation example and explain the mechanism ; the simulation results demonstrate that by making use of chaos inherent in dc / dc boost converter and controlling parameters we can reduce emi level of the switched - mode power supply without any additional circuits being involved 以具有反饋環(huán)路的dc dcboost型變換器為對象,進行了機理闡述和計算機模擬。所得結(jié)果表明,利用開關模式電源中固有的混沌現(xiàn)象,通過簡單的組合參數(shù)控制就可以在不附加任何外圍電路的情況下降低開關模式電源的電磁干擾水平。