Wireless Power Receiver FOD Packets for Stable Charging Control
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Solution Overview
Problem
Current wireless charging technologies face challenges in accurately detecting foreign objects, leading to inefficient power transmission and potential device damage due to overheating, as they often incorrectly determine the presence of foreign objects, resulting in unnecessary charging stops or continued charging with reduced efficiency.
Innovation Solution
A method and apparatus for controlling wireless power transmission that includes a foreign object detection system using packets to determine the presence of foreign objects based on power loss and temperature changes, allowing for adaptive power control between first and second power transfer modes to prevent damage and ensure seamless charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foreign object detection is performed using conventional methods, then charging may be stopped to prevent device damage, but false detection leads to unnecessary charging stops and reduced productivity
Solution Approach 1:
The system continuously monitors power loss during wireless charging and uses this feedback to dynamically adjust charging status. By establishing a reference power loss value and comparing real-time measurements against it, the system can accurately detect foreign objects and respond appropriately, reducing false positives that cause unnecessary charging interruptions
Solution Approach 2:
The system changes the detection parameter from simple presence detection to power loss measurement. By quantifying the amount of power lost during transmission and comparing it to established thresholds, the system can distinguish between normal variations and actual foreign object presence, thereby improving detection accuracy and maintaining charging productivity
2Measurement precision
If foreign object detection sensitivity is increased to prevent device damage, then detection accuracy improves, but false positives increase causing unnecessary charging stops
Solution Approach 1:
The system uses continuous power loss monitoring with feedback control to adjust detection decisions. By comparing real-time power loss measurements against dynamically updated reference values and thresholds, the system achieves high detection precision while filtering out false positives that would interrupt charging
Solution Approach 2:
The detection system is made dynamic by continuously adjusting reference power loss values based on charging conditions. Rather than using fixed thresholds, the system adapts its detection criteria to current operating parameters, maintaining high sensitivity for actual foreign objects while tolerating normal variations in power consumption
3Productivity
If power transmission continues without accurate foreign object detection, then charging productivity is maintained, but device damage may occur due to overheating
Solution Approach 1:
The system implements continuous feedback monitoring of power loss during transmission. By comparing measured power loss against reference values, the system can detect foreign objects in real-time and immediately adjust or stop power transmission, preventing overheating damage while minimizing interruption to charging productivity
Solution Approach 2:
The system performs preliminary foreign object detection before initiating full power transmission and continues monitoring throughout the charging process. By detecting foreign objects early and maintaining continuous surveillance, the system can prevent damage before it occurs while keeping charging interruptions to a minimum
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 enhances the accuracy of foreign object detection, preventing device damage and ensuring seamless charging by dynamically adjusting power transmission based on the presence of foreign objects, thereby stabilizing power delivery and reducing errors in wireless charging systems.
Implementation Method 1
Wireless power transmission or wireless energy transfer technology refers to technology of wirelessly transmitting electric energy from a transmitter to a receiver using the principle of magnetic induction
Implementation Method 2
If a conductor which is not a wireless power receiver—that is, a foreign object (FO)—is present in a wireless charging area, an electromagnetic signal received from a wireless power transmitter may be induced in the FO
Data Source
AI summary
A wireless power receiver of receiving power from a wireless power transmitter, including a receiving part configured to receive a wireless power from the wireless power transmitter; and a main controller configured to generate a signal including an FOD status packet, wherein the main controller transmits a signal including the FOD status packet to the wireless power transmitter; wherein the main controller receives a first power from the wireless power transmitter when a NAK response indicating that a foreign object is present in a charging area of the wireless power transmitter is received from the wireless power transmitter, or receives a second power from the wireless power transmitter when an ACK response indicating that the foreign object is not present in the charging area of the wireless power transmitter is received from the wireless power transmitter, in response to the FOD status packet; wherein the main controller transmits a reception power packet including information on reception power intensity to the wireless power transmitter; and wherein the main controller receives a signal including information on a result of determining whether the foreign object is present in the charging area from the wireless power transmitter using information measured or calculated by the wireless power transmitter in response to the reception power packet, while receiving the second power.