Wireless Charger NFC Dead Battery Detection
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Solution Overview
Problem
Conventional inductive chargers for portable devices require precise placement and are not suitable for devices with dead or improperly mounted batteries, limiting their charging efficiency and usability in various environments.
Innovation Solution
A power transfer system utilizing near field communication (NFC) for data communication between the charger and device, allowing for the establishment of a power transfer link with adjustable charging power, enabling charging even when the device's battery is dead or not properly mounted, by requesting and detecting identification information and adjusting the magnetic field strength accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductive chargers use magnetic cores with coils to generate magnetic field for wireless charging, then physical contacts are eliminated and devices can be used in wet or dusty environments, but the flux distribution becomes non-uniform and charging efficiency becomes highly dependent on correct device placement
Solution Approach 1:
The charging surface is divided into multiple independently controllable coil segments. Instead of using a single large coil, the system employs an array of smaller coils that can be individually activated or deactivated based on device position, creating a modular approach to magnetic field generation.
Solution Approach 2:
The system dynamically adjusts which coils are active and modifies their driving parameters in real-time based on detected device position and charging requirements. This dynamic control allows the magnetic field distribution to adapt to different device placements, maintaining uniform flux distribution regardless of device position.
2Reliability
If conventional chargers require physical plug and socket connections for charging, then charging can be established reliably, but devices cannot be used in wet environments and contacts may corrode or short out
Solution Approach 1:
The mechanical plug-and-socket connection system is replaced with an electromagnetic field-based power transfer system. Instead of physical electrical contacts, the invention uses inductive coupling between transmitter and receiver coils to transfer power wirelessly, eliminating the mechanical connection component entirely.
3Adaptability or versatility
If multiple docking stations are used for different portable devices, then each device can be charged properly, but they take up space in plug strips and create messy tangles of wires
Solution Approach 1:
The charging system is designed with universal compatibility to accommodate multiple different portable devices simultaneously on a single charging surface. The array of coils can be selectively activated to serve different device types and positions, replacing the need for multiple dedicated docking stations with one multi-functional charging platform.
4Productivity
If inductive chargers require precise device placement on predefined positions, then optimal charging efficiency is achieved, but user interface flexibility is limited and devices must be placed in stands
Solution Approach 1:
The system employs dynamic coil selection and parameter adjustment based on real-time detection of device position and orientation. Instead of requiring static predefined placement zones, the system adapts its magnetic field configuration to match the actual device position, maintaining optimal charging efficiency across a broader range of placements.
Solution Approach 2:
The driving parameters of the coils (such as current magnitude and frequency) are dynamically adjusted based on device characteristics and position. This parameter adaptation allows the system to optimize charging efficiency for different device configurations without requiring precise manual placement by the user.
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
Ensures optimized charging and data communication for portable devices with dead or improperly mounted batteries, allowing for emergency operation and reducing the risk of damage, while enabling charging in diverse environments without the need for precise placement.
Implementation Method 1
The basical principle of such inductive chargers involves magnetic cores with a coil wound around the cores, and a generated magnetic field penetrating through the air gap or a region of non-magnetic material between the devices and forming a magnetic inductive link for power transmission.
Implementation Method 2
The power transfer device and the portable device each comprise a near field communication functionality for data communication by a data communication link between the devices.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention relates to a power transfer system which comprises a power transfer device (10) as well as at least one portable device (20), and to a method of controlling the power transfer system specifically in case of a dead battery condition of a battery (21) of the portable device (20). The power transfer device (10) for wireless charging of the battery (21) arranged in the portable device (20) and the power transfer device (10) each comprise a near field communication functionality for data communication by a data communication link (32) between the devices. The method includes a step of starting to establish the data communication link (32) between the power transfer device (10) and the portable device (20). When the establishment of the data communication link (32) is started, the power transfer device (10) requests the portable device (20) to transmit an identification information via the data communication link (32) to the power transfer device (10). It is then detected whether the identification information of the portable device (20) is received by the power transfer device (10). Depending upon whether the identification information is received a setting is performed for setting a charging power to be transferred from the power transfer device (10) to the portable device (20). The setting provides a reduced charging power not exceeding a first predetermined value when the identification information is not received. Depending upon this setting a power transfer link (31) is established by the power transfer device (10), and the charging power not exceeding the first predetermined value is transferred to the portable device (20) so that the portable device (20) can be powered by this transferred power to enable data communication and to charge the battery (21).