功率变换系统 meaning in English

power-conversion system

At present , there are three kinds of modes of modulation including pulse width modulation ( pwm ) , pulse frequency modulation ( pfm ) and the modulation of combination of pwm and pfm . lots of products using above modulations are designed in many famous companies
目前,在功率变换系统中常见的有三种调制模式:脉宽调制模式( pwm , pulsewidthmodulation ) 、脉频调制模式( pfm , pulsefrequencymodulation )和二者可以相切换的pwm / pfm模式。