A multiplexing device of NFC coil and wireless charging coil

Abstract

The invention relates to a multiplex device of a near field communication (NFC) coil and a wireless charging coil. The multiplex device comprises a first coil, a second coil, a carrier, a metal circuit, an NFC circuit, a wireless charging circuit, a control circuit and a magnetic switching mechanism; during wireless charging, the magnetic switching mechanism is used for combining the first coil and the second coil to form a charging coil according to a current provided by the control circuit, communicating with the wireless charging circuit to form a wireless charging loop and simultaneously cutting off the NFC circuit; and during NFC, the magnetic switching mechanism is used for disconnecting the first coil and the second coil according to the current provided by the control circuit, disconnecting the wireless charging circuit and enabling the first coil and the NFC circuit to form an NFC loop. A current signal is used for controlling the magnetic switching mechanism so as to achieve switching between wireless charging and NFC, the magnetic switching mechanism can be used for thoroughly cutting off the wireless charging loop and the NFC loop, and no efficiency loss is generated; and meanwhile, the NFC circuit is disconnected during wireless charging, the wireless charging circuit is disconnected during NFC, and no signal interference exists between the NFC circuit and the wireless charging circuit.

Description

technical field [0001] The invention relates to the technical fields of NFC and wireless charging, in particular to a multiplexing device of an NFC coil and a wireless charging coil. Background technique [0002] The full name of NFC is Near Field Communication, that is, near-field communication, which is derived from radio frequency identification (RFID, Radio Frequency ldentify Detection) technology. Point-to-point short-range communication between various devices. NFC technology is widely used in wireless payment, data transmission and other fields. In recent years, as mobile payment has become more and more popular in life, NFC has gradually become the standard configuration of smartphones. At the same time, the long-silent wireless charging technology has The charging power has been significantly improved, and the space and resources occupied by NFC can be partially reused, and it has begun to gradually integrate with NFC. [0003] However, although NFC and wireless c...

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Problems solved by technology

[0003] However, although NFC and wireless charging reuse the same piece of ferrite electromagnetic shielding material, the coil and circuit exist independently, which will cause a problem: when the given occupied area is certain, the NFC coil and wireless charging coil often need Compromise on area and isolation leads to deterioration of both NFC coil performance and wireless charging coil performance. At the same time, NFC coil and wireless charging coil are inevitably in close contact, and mutual interference cannot be effectively eliminated in a small space. Therefore, , the industry has proposed the idea of ​​sharing a coil with NFC and wireless charging

[0004] At present, NFC and wireless charging coils realize time-sharing multiplexing of NFC and wireless charging coils in the form of electronic switches. However, the implementation of electronic switches has the following disadvantages: 1. Electronic switches generally cannot withstand high power, and wireless charging of smart terminals The power is as high as 10W or more, and the requirement for charging power is getting higher and higher. It is necessary to develop an electronic switch with a higher rated power; Large crosstalk; 3. The introduction of electronic switches will inevitably lead to a drop in efficiency, which will be converted into excess heat, which poses a challenge to the heat treatment of mobile terminals

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