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TMS320F28069M: simulink里搭建的svpwm里面TaTbTc转换为寄存器值但为什么输出恒定占空比pwm

Part Number: TMS320F28069M


用simulink代码生成,输出svpwm波,其中TaTbTc马鞍形波,simulink里的epmw模块打用up-down模式,TCLK是45HM,TPRD2250,,将马鞍波进行了归一化处理,乘以了2250,将其转化为cmpa寄存器的值输入到epwm模块中,但实际输出的pwm波形还是百分之50占空比的幅值,没有变化这是为什么