当电机不转时产生一个中断

你好
 
 
我有一个问题我需要ST72141作为发电机。如果电机是外部推进的，我想调节速度。为此，我需要在中断中传递的零交叉时间。但我在这种模式下没有中断。在正常模式下，当电机由处理器驱动时，一切正常。
有人有想法吗？
 
谢谢
踢球者



以下为原文




Hello


I have a problem I need the ST72141 as a generator. I want to regulate the speed if the motor is externally propelled. For this I need the zerocrossing times which passed in the Interrupt. But I don't have Interrupts in this mode. In the normal mode when the motor is driven by the processor althing is okay.  
Have anyone an idea?  

Thanks  
Kicker

你的问题似乎很难......我自己从未这样做过，这只是对这个问题的简短分析。
 
内部状态机完成的方式，除非你在换向C和退磁之前，否则不可能有Z事件（BEMF过零）。
 
- 换向：你可以想象有一个换向和一个非常低的电压/电流
- 退磁：这应该不是问题，软件退磁对于BEMF来说只是一个死时间。
 
我看到的第二个问题与您的高端开关有关。如果为驱动程序使用自举电源，则必须小心。
 
如果停止通勤低侧开关，驱动器将停止工作。
 
另一种方法只是汇集比较器输出。



以下为原文




Your problem seems difficult... I have never done it myself, this is just a short analysis of the question.

The way the internal state machine is done, it is impossible to have the Z event (BEMF zero crossing) unless you had before the commutation C and the demagnetization D.  

- The commutation: you can imagine having a commutation and a very low voltage/current applied  
- The demagnetisation: this should not be a problem, a software demagnetisation is a just a dead time for the BEMF.  

The second problem I see is linked to your high side swithes. You have to be careful if you use a bootstrap power supply for the drivers.  

The drivers will stop working if you stop commuting the low side switches.  

The other approach is just by pooling the comparator output.