Magnetically Coupled NFC and Power Coils for Interference Isolation
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Solution Overview
Problem
Existing near field communication technologies face limitations in efficiently transmitting both data and energy, particularly in protecting communication circuits from power interference during energy transfer.
Innovation Solution
The use of magnetically coupled coils with a coupling coefficient greater than 0.5, where one coil is configured for data transmission and reception at a lower frequency and another for energy transmission and reception at a higher frequency, separated by a support, ensures that the communication circuit is protected from power interference by switching between operational phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil is used for both data and energy transmission, then device complexity is reduced, but the communication circuit is exposed to power interference during energy transfer
Solution Approach 1:
The antenna is segmented into two distinct coils: a first coil for data transmission and a second coil for energy transmission. This segmentation allows each coil to be optimized for its specific function and prevents power interference from the energy coil from affecting the communication circuit during energy transfer operations.
Solution Approach 2:
The harmful power interference is extracted and isolated by dedicating the second coil exclusively to energy transmission. The communication circuit is then protected by switching it off during energy transfer phases, effectively removing the interference pathway that would exist in a single-coil design.
2Productivity
If the first circuit is activated during energy exchange, then power transfer efficiency is improved, but the communication circuit is damaged by excessive power
Solution Approach 1:
The system operates in periodic phases: during energy exchange phases, the first circuit is activated for efficient power transfer while the communication circuit is switched off; during data transmission phases, the roles are reversed. This periodic switching ensures both high energy transfer efficiency and protection of the communication circuit from damage.
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
This solution enables effective and safe simultaneous data and energy transfer by ensuring the communication circuit operates within a safe power threshold during data transmission and allows higher power transfer during energy charging phases, preventing damage to the data transmission circuit.
Implementation Method 1
a first coil configured to transmit and receive signals having a first frequency; and a second coil configured to transmit and receive signals having a second frequency greater than at least twice the first frequency; wherein the first and second coils are magnetically coupled with a coupling coefficient greater than 0.5
Data Source
AI summary
An antenna configured for near field communication includes a first coil for transmitting and receiving signals having a first frequency and a second coil for transmitting and receiving signals having a second frequency greater than at least twice the first frequency. The first and second coils are magnetically coupled with a coupling coefficient greater than 0.5.