Wireless Power Transfer Slot Timing for Foreign Object Detection
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Solution Overview
Problem
Existing wireless power transmission systems lack effective methods for detecting foreign objects during power transfer, which can lead to potential damage or inefficiencies.
Innovation Solution
A wireless power transmitter and receiver system that includes a communication/control circuit to perform foreign object detection by exchanging data packets during a designated slot time, allowing the wireless power receiver to set and communicate the slot time for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foreign object detection is performed continuously during power transfer, then detection reliability is improved, but energy consumption and system complexity increase
Solution Approach 1:
The system performs foreign object detection at periodic intervals during power transfer by allocating specific slot times for detection. The communication/control circuit switches between power transfer mode and detection mode in a periodic fashion, maintaining detection reliability while limiting energy consumption to discrete time windows rather than continuous operation.
Solution Approach 2:
The power transfer process is segmented into distinct phases: power transfer slots and foreign object detection slots. By dividing the continuous power transfer into discrete time segments, the system can dedicate specific intervals to detection without compromising overall power delivery, thus balancing reliability with energy efficiency.
2Object-affected harmful factors
If foreign object detection is performed during power transfer, then safety is improved, but power transfer efficiency decreases due to intermittent detection slots
Solution Approach 1:
The system performs foreign object detection partially by selecting specific slot times during power transfer rather than continuous monitoring. This partial action approach provides sufficient safety coverage at critical intervals while minimizing the impact on overall power transfer efficiency and productivity.
3Measurement precision
If the receiver sets and communicates slot time information, then detection precision is improved, but communication complexity increases
Solution Approach 1:
The wireless power receiver autonomously determines the slot time for foreign object detection and communicates this timing information to the transmitter. By having the receiver self-determine and self-manage the detection schedule, the system achieves precise detection timing while keeping the communication protocol relatively simple, as the receiver is already managing its own power reception timing.
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 effective detection of foreign objects during power transfer, ensuring safe and efficient power transmission by reducing the risk of damage to receivers and optimizing charging conditions.
Implementation Method 1
The magnetic induction method corresponds to a method transmitting power by using electric currents that are induced to the coil of the receiver by a magnetic field, which is generated from a coil battery cell of the transmitter, in accordance with an electromagnetic coupling between a transmitting coil and a receiving coil.
Implementation Method 2
The magnetic resonance method is similar to the magnetic induction method in that is uses a magnetic field. However, the magnetic resonance method is different from the magnetic induction method in that energy is transmitted due to a concentration of magnetic fields on both a transmitting end and a receiving end, which is caused by the generated resonance.
Data Source
AI summary
A wireless power transmission apparatus according to an embodiment of the present specification transmits wireless power to a wireless power reception apparatus and comprises: a power conversion circuit that transmits the wireless power to the wireless power reception apparatus; and a communication/control circuit that communicates with the wireless power reception apparatus and controls the wireless power. In a power transfer phase for transmitting the wireless power to the wireless power reception apparatus, the communication/control circuit may receive, from the wireless power reception apparatus, a data packet including information about a slot time for performing foreign object detection and perform the foreign object detection during the slot time.