Single Antenna Wireless Charging and NFC Control
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Solution Overview
Problem
Existing wireless charging and short-range communication systems require separate antennas for wireless charging and communication, which can lead to excessive power supply to communication modules during charging, potentially damaging them.
Innovation Solution
A single antenna-based apparatus that uses a switch controller to detect resonance frequencies and generate control signals to switch between wireless charging and short-range communication modes, preventing excessive power supply to communication modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate antennas are used for wireless charging and short-range communication, then both functions can operate independently, but the device complexity and risk of excessive power supply to communication modules increases
Solution Approach 1:
The patent combines the wireless charging antenna and short-range communication antenna into a single shared antenna system. The antenna structure is merged such that one antenna serves dual purposes: receiving power during wireless charging and communicating during NFC/RFID operations. This reduces the total number of antennas from two to one, simplifying the device structure while maintaining functional independence through frequency-based separation.
Solution Approach 2:
The single antenna is designed with universal functionality to perform both wireless power reception and short-range communication tasks. The antenna structure supports multiple frequency bands (6.78 MHz for wireless charging and 13.56 MHz for NFC/RFID), allowing it to adapt to different operational modes. This multi-functional design eliminates the need for separate dedicated antennas for each function.
2Device complexity
If a single antenna is used for both wireless charging and short-range communication, then device complexity is reduced, but the ability to independently control power supply to different modules becomes challenging
Solution Approach 1:
The patent implements dynamic control mechanisms including a switch controller and power supply controller that dynamically adjust system operation based on detected frequency. The switch dynamically connects or disconnects the antenna from different modules (power receiving unit or communication module) based on the operational mode. The power supply is dynamically regulated to provide appropriate power levels for wireless charging while preventing excessive power to the communication module, enabling flexible and safe operation.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller detects the resonant frequency of the antenna system and uses this information to determine the appropriate operational mode. Based on the detected frequency (6.78 MHz for wireless charging or 13.56 MHz for NFC/RFID), the controller provides feedback control signals to the switch and power supply controller to configure the system accordingly. This closed-loop feedback ensures proper power distribution and module activation without manual intervention.
3Use of energy by moving object
If the antenna operates at wireless charging frequency (6.78 MHz), then power reception is enabled, but the communication module may receive excessive power and be damaged
Solution Approach 1:
The patent introduces a switch as an intermediary component between the shared antenna and the communication module. During wireless charging operation at 6.78 MHz, the switch controller activates the switch to connect the antenna to the power receiving unit while simultaneously disconnecting the communication module from the antenna. This intermediary switching mechanism ensures that when the antenna is receiving power, the communication module is isolated and protected from excessive power exposure. The switch acts as a protective mediator that enables power reception while preventing harmful power exposure to the communication module.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables wireless charging and short-range communication using a single antenna, protecting communication modules from excessive power and allowing efficient operation in both modes.
Implementation Method 1
detect a resonance frequency from a rectifier input signal of a power receiving unit
Implementation Method 2
there is a method of wireless charging using magnetic resonance
Implementation Method 3
wireless charging using magnetic resonance
Implementation Method 4
A short-range communication module that performs a communication by forming a magnetic field in a frequency band of several to tens of MHz
Data Source
AI summary
Disclosed are a single antenna-based wireless charging and near field communication control apparatus and a user terminal therefor. A single antenna-based wireless charging and near field communication control apparatus according to one embodiment comprises: a switch control unit for detecting a resonance frequency from an input signal of a rectifier in a power receiver and determining whether the detected resonance frequency is a first frequency for wireless charging using a single antenna or a second frequency for near field communication using a single antenna, to generate a control signal; and a switch which is turned on/off for wireless charging or near field communication according to the received control signal from the switch control unit.