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DSP28035在SPWM中EPWM配置定时中断的问题

在做单相逆变电源,主电路为单相全桥,在生成SPWM,配置4路产生SPWM信号,用的是查正弦表的方法生成,EPWM模块配置也一样,然后配置在定时中断产生比较生成SPWM,可是输出波形都不一样,这是为什么,是不是定时中断有先后级别,要怎么解决?