确认下transform.c文件里计算占空比的代码，里面的12.0是母线电压吗

[cherry2tm]

/* calculate the duty cycle in center alignment mode */
*u = (IQdiv(Ta, IQ(12.0)) >> 1) + IQ(0.5);
*v = (IQdiv(Tb, IQ(12.0)) >> 1) + IQ(0.5);
*w = (IQdiv(Tc, IQ(12.0)) >> 1) + IQ(0.5);