Wireless Power Supply Foreign Object Detection via Reflection Monitoring
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Solution Overview
Problem
Conventional power supply systems face issues in reliably supplying power to electronic devices due to interference from foreign objects between primary and secondary coils, leading to inefficient energy transfer.
Innovation Solution
A power supply apparatus equipped with a control unit that detects foreign objects by measuring changes in reflection values and adjusts power output accordingly, ensuring efficient energy transfer based on the presence or absence of foreign objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foreign object such as a metal is placed between the primary and secondary coils, then the power supply apparatus cannot suitably supply electric power to the electronic apparatus, but the presence of the foreign object causes interference and reduces power transfer efficiency
Solution Approach 1:
The control unit performs preliminary detection of foreign objects by monitoring reflection values before initiating full power transfer. This preliminary action allows the system to identify the presence of foreign objects in advance and adjust power supply parameters accordingly, preventing energy loss and ensuring reliable power transfer by avoiding interference from detected foreign objects
Solution Approach 2:
The system continuously monitors reflection values during power transfer and provides feedback to the control unit. Based on this feedback, the control unit dynamically adjusts power supply parameters to maintain efficient energy transfer while ensuring reliable operation, even when foreign objects are present in the vicinity
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 system effectively detects foreign objects and optimizes power supply, preventing interference and ensuring reliable energy transfer to electronic devices.
Implementation Method 1
a power supply apparatus having a primary coil for wirelessly outputting power without connector-based connections, and an electronic apparatus having a secondary coil for wirelessly receiving the power supplied from the power supply apparatus
Implementation Method 2
a control unit that determines that a predetermined object is detected if a reflection corresponding to power outputted by the power supply unit is greater than or equal to a first value
Data Source
AI summary
A power supply apparatus includes a power supply unit that wirelessly outputs power to an electronic apparatus, a control unit that determines that a predetermined object is detected if a reflection corresponding to power outputted is greater than or equal to a first value and determines that the predetermined object is detected if a change of a reflection corresponding to power outputted by the power supply unit is greater than or equal to a second value.