An electronic device includes: a coil, a chip with a contact-less function, a rectifier and a switcher. The switcher is connected between the coil and the chip. A first output terminal of the coil is connected to a first input terminal of the rectifier and a second input terminal of the chip. The coil is configured to sense a field and output an AC signal; the rectifier is used for receiving an AC signal input by the coil and outputting electric power through a second output terminal of the rectifier. The switcher is used for connecting the coil with the chip under an input operating voltage, and controlling a connection or disconnection of the coil and the chip according to a control signal when the control signal is received.