Patent ID: 7944171

Claim:
An attachable wireless charging device, comprising: a carrier board, which has a back surface on which an adhesive layer is coated; a receiving coil, which is formed in the carrier board; a circuit board, which is mounted to one side of the carrier board, the circuit board comprising a power receiving circuit, which comprises a receiving control circuit, a resonance control circuit, a regulation circuit, a control circuit, a polarity selection circuit, and a circuit output section, which are electrically and sequentially connected, electrical connection being established between the receiving control circuit and the receiving coil; and at least two conductive wires, which are arranged at one side of the circuit board and are electrically connected to the circuit output section of the circuit board; whereby an attachable wireless charging device featuring automatic determination of polarity connection for charging; wherein the polarity selection circuit of the power receiving circuit of the circuit board comprises; wherein the polarity selection circuit of the power receiving circuit of the circuit board comprises an electric cell, a first group of serially connected switches, and a second group of serially connected switches; the first group of serially connected switches forming a first polarity node therebetween, the second group of serially connected switches forming a second polarity node therebetween; the first and second polarity nodes being electrically connected to the circuit output section, the circuit output section being electrically engageable with a rechargeable battery through the conductive wires to carry out automatic determination of polarity connection with the rechargeable battery.