Method and intelligent terminal of power supply and communication to external equipment through audio interface

The invention discloses a method and an intelligent terminal of power supply and communication to external equipment through an audio interface. The method of power supply and communication to the external equipment through the audio interface comprises the following steps: detecting that the external equipment is connected through audio interfaces; receiving commands of supplying power to the external equipment; selecting a sound track of the audio interfaces to be used as a power transmit channel; transmitting sine waves through the power transmit channel and enabling the sine waves to be converted into direct current used by the external equipment by a rectifying and voltage stabilization device of the external equipment; relying on original audio interfaces to supply power to the external equipment without changing hardware of the intelligent terminal. The method of power supply to the external equipment further comprises the following steps: adopting digital modulation technology, selecting one sound track of the audio interfaces to be used as an output channel, selecting a microphone of the audio interfaces to be used as a data input channel to achieve the communication between the intelligent terminal and the external equipment. Due to the fact that the audio interfaces are standard and arranged on all intelligent terminals, the technical scheme is enabled to have generality and be low in cost.