Fecha de publicación: 26/03/2019 Fuente: Wipo "IOT" The utility model relates to a charging control technology, does it disclose a NB the circuit of automatic switch -over power supply mode when the IOT module charges, NB in the solution conventionalart when charging, still leans on the IOT module problem of lithium cell power supply existence. Does this circuit include NB the battery of IOT module, first diode, second diode and third diode, the anodal NB that connects of first diode the battery of IOT module, is NB connected to the negative pole of first diode the electric source port of IOT module, the positive pole of third diode is connected to the negative pole of second diode, is NB connected to the negative pole of third diode the electric source port of IOT module, is the positive pole of second diode at NB when charging, the IOT module connects the adapter that charges, the device lectotype of first diode, second diode and third diode satisfies: at NB when the IOT module charged, the negative pole voltage of first diode was higher than its positive pole tension.