NFC Charging Event Detection for Lower Power Dissipation
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Solution Overview
Problem
Near field communication (NFC) devices face inefficiencies in wireless charging due to continuous RF field emission during long charging sessions, leading to increased power consumption and delayed detection of events like device removal or foreign object proximity, which can cause unnecessary energy wastage and user experience issues.
Innovation Solution
An NFC device with a detection unit and processing unit that monitors predefined events during power transfer, allowing dynamic control of power transfer by disabling the receiver and interrupting charging when necessary, thereby reducing power dissipation and enhancing user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NFC device continuously emits RF field during charging sessions, then power transfer is maintained, but power consumption increases and detection of events is delayed
Solution Approach 1:
The NFC device alternates between continuous wave emission for power transfer and listening phases for event detection. The device periodically switches from transmitting power to monitoring the NFC channel for events, creating a periodic action pattern that balances power consumption with reliable event detection capability
Solution Approach 2:
The system dynamically adjusts its operational state based on detected events. The NFC device transitions between different operational modes (continuous wave emission, listening state, interrupted charging) in response to real-time conditions, making the power consumption adaptive rather than static
2Loss of energy
If the NFC device continuously emits RF field, then charging session is maintained, but unnecessary energy wastage occurs when events like device removal or foreign object proximity happen
Solution Approach 1:
The system implements feedback by continuously monitoring the NFC channel for events during charging sessions. When events such as device removal or foreign object proximity are detected, the system receives feedback information and adjusts power transfer accordingly, preventing continued energy wastage and enabling timely response to changing conditions
3Reliability
If the receiver is kept enabled during power transfer, then event detection is immediate, but power consumption increases
Solution Approach 1:
The detection unit is extracted as a separate functional component from the main NFC unit. This allows the detection unit to monitor events independently while the main NFC unit can be placed in a low-power state or disabled during continuous wave emission, separating the power consumption of detection from power transfer operations
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
The solution dynamically controls wireless power transfer, reducing energy wastage and improving user experience by enabling early detection and response to events like device removal or foreign object proximity, thus minimizing power consumption and ensuring efficient charging operations.
Implementation Method 1
a primary device may generate a radio frequency (RF) field at a frequency of 13.56 MHz to power a secondary device
Data Source
AI summary
In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: an NFC unit configured to charge an external device under charge by transferring power to said device under charge through an NFC channel; a detection unit configured to detect predefined events occurring on the NFC channel when said power is being transferred to the device under charge; a processing unit configured to control the transferring of power to the device under charge in dependence on the events detected by the detection unit. In accordance with a second aspect of the present disclosure, a corresponding method of operating a near field communication (NFC) device is conceived.