The experimental results show that the PWM spectrum decides the EMI spectrum of converter and the chaotic PWM has the best effect in EMI suppressing.

• 分别进行的定频、周期扩频和混沌PWM实验结果表明,EMI的频谱分布取决于PWM频谱分布,其中混沌PWM抑制EMI效果最好,虽然开关变换器输出电压的纹波频率随混沌扩频信号改变,但峰峰值基本不变。