50Hz / 60Hz power frequency automatic identification method

摘要

this invention is 50Hz / 60Hz power frequency automatic identification methods about, is the use of the power supply is on and is set as the minimum delay time, the delay of the two interrupt related to the natural cycle ud69fuc218ub97c memory method (3 1) and the delay of the delay period of time after the interrupt frequency according to a frequency of the 60Hz 50Hz and automatically judge the judgment means (32) and the data in order to determine the normal power frequency is selected to be normal operation the normal operation cycle means (33), including automatic frequency selection, the operation is easy to judge and select a frequency error in time to prevent it.