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TMS320F2812 开发电机控制器,当有火花干扰时复位,或干扰。

2812在遇到继电器吸合等火花干扰(不论本系统还是外系统)后会复位或死机,这种概率大概占50%吧,不是每次都复位或死机。请问这是供电电源问题,还是干扰到DSP了,控制的继电器我都加光耦隔离了。控制板我画的是四层板。请专家指点!