频率宽度 meaning in English

band width
superimposed ripple voltage

First , the operational principle of the boost converter which includes continuous mode and discontinuous mode was analyzed as well as the basic theory about current mode and the circuit modulation which includes pulse width modulation ( pwm ) and pulse frequency modulation ( pfm )
首先分析boost电路的两种工作模式,即连续电流模式和不连续电流模式,然后分析了目前应用比较广泛的电流反馈控制模式,最后对频率宽度调制( pwm )模式和频率脉冲调制( pfm )模式进行了对比分析。