Structure of switched dual mode NFC/WPT antenna

摘要

The present invention relates to a dual mode NFC and WPT antenna structure using switching, comprising: a battery pack (1) of a smart device; a ferrite sheet (2) to reduce an eddy current generated in a near conductor; an NFC antenna (3) of 13.56 MHz; an NFC board (4) which is connected to the NFC antenna (3); a WPT antenna (5) to receive an induced electromotive force by self-induction in a copper wire coated with an enamel wire from a wireless charger body in an approach to the wireless charger body having an WPT transmitter; an WPT board (6) which is connected to the WPT antenna (5) and has a WPT module (WPT receiver and AC/DC voltage converting circuit/rectification/smoothing circuit/overcharge protecting circuit/charging module) to receive the induced electromotive force by self-induction from the wireless charger body approached by the copper wire coated with the enamel wire and to charge wireless power; and a switching circuit which has additional capacitor (Cb) and switch 2 that allow the WPT antenna to act as a booster of the NFC antenna for triple resonance when the WPT antenna is operated in an NFC mode in a double resonance circuit on a self-induction power receiver which conforms to Qi requirements of WPC, thereby preventing degradation of performance of an existing NFC system due to frequency interference or signal interference by the metal component of the copper wire coated with enamel wire of the WPT antenna in a near field by using the switching circuit so that the NFC antenna and the WPT antenna which are attached to a backside case of the smart device can be operated without degradation of performance in a dual mode.