Integrated Foreign Object Detection in Resonant Power Systems
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Summary
Problems
Conventional power supply devices with separate sensor coils for foreign object detection result in increased size, mass, cost, and power consumption, and struggle to detect objects at a distance or near the center between transmission and reception antennas.
Innovation solutions
A resonant type transmission power supply device with a transmission power state detecting circuit, foreign object detecting circuit, and power control circuit that integrates foreign object detection directly into the transmission antenna system, allowing for power reduction or cessation when a foreign object is detected.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If sensor coils are disposed separately from the transmission antenna for foreign object detection, then detection function is achieved, but device size and mass increase
Why choose this principle:
The patent combines the foreign object detection function with the transmission antenna by using the transmission antenna itself as the detection coil. The transmission antenna serves dual purposes: transmitting power wirelessly and detecting foreign objects through changes in its electromagnetic field, thereby eliminating the need for separate sensor coils and reducing device mass.
Principle concept:
If sensor coils are disposed separately from the transmission antenna for foreign object detection, then detection function is achieved, but device size and mass increase
Why choose this principle:
The transmission antenna is designed to perform multiple functions simultaneously: it acts as both the power transmission element and the foreign object detection sensor. By making the transmission antenna universal for both power transmission and detection purposes, the patent eliminates redundant components and reduces overall device weight.
Application Domain
Data Source
AI summary:
A resonant type transmission power supply device with a transmission power state detecting circuit, foreign object detecting circuit, and power control circuit that integrates foreign object detection directly into the transmission antenna system, allowing for power reduction or cessation when a foreign object is detected.
Abstract
Disclosed is a resonant type transmission power supply device including a transmission power state detecting circuit 11 to detect a transmission power state of a transmission antenna 2, a foreign object detecting circuit 124 to detect the presence or absence of a foreign object in an electromagnetic field generated from the transmission antenna 2 on the basis of a detection result acquired by the transmission power state detecting circuit 11 , and a power control circuit 125 to reduce lit or stop the supply of electric power to the transmission antenna 2 when foreign object is detected by the foreign object detecting circuit 124.