The volume of the output filter can be reduced greatly used in cascade inverter with carrier-phase-shifted SPWM technology which has a high equivalent switching frequency and a good output sine wave. It is the base of the high power density of ASI. 载波移相正弦脉宽调制技术有独特的消谐波优势,其等效开关频率高,输出波形正弦度好,可以大幅减小滤波器体积,为实现系统的高功率密度奠定基础。