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TMS320F28027: 因为在做UPS程序,故要用到SFRA,对一函数SFRA_F32_inject有疑问

Part Number: TMS320F28027
Other Parts Discussed in Thread: SFRA

SFRA_F32_inject是小信号的注入,SFRA_F32_inject函数的返回值是否是输入值与参考值的差值,为什么差值不直接做减法却用这个函数?

谢谢!