分享一个双电源自动切换供电的电路： 纯分离元件搭的。 详细链接：https://blog.csdn.net/changsic/article/details/121448895?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522170369678116800180653769%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=170369678116800180653769&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_ecpm_v1~rank_v31_ecpm-6-121448895-null-null.nonecase&utm_term=%E8%87%AA%E5%8A%A8&spm=1018.2226.3001.4450