Wireless Charging Coil Antenna Alignment
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Solution Overview
Problem
Conventional wireless charging systems fail to initiate power supply when a vehicle is parked obliquely relative to the power supply and receiving sections, leading to low reception levels and safety concerns due to misalignment.
Innovation Solution
A power supply apparatus with a spiral coil and a communication section using an antenna positioned within a hollow portion, and a power receiving apparatus with a radio tag, both disposed to detect each other's electromagnetic waves, allowing for precise alignment and power transfer regardless of the vehicle's orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vehicle is parked obliquely relative to the parking space, then the vehicle can be parked more flexibly, but the reception level of the reference position signal becomes low making it impossible to start power supply
Solution Approach 1:
A radio tag is introduced as an intermediary device installed on the vehicle, which communicates with the power supply apparatus through electromagnetic waves. This intermediary enables position detection even when the vehicle is parked obliquely, resolving the contradiction between parking flexibility and signal reception reliability
Solution Approach 2:
The patent replaces the mechanical/optical alignment system (camera-based positioning) with an electromagnetic field-based detection system using radio tags. This substitution allows for more flexible parking positions while maintaining accurate position detection capability
2Measurement precision
If the antenna is positioned closer to the power receiving coil, then the communication section can detect the electromagnetic wave more effectively, but the electromagnetic wave transmission range becomes too wide causing safety concerns
Solution Approach 1:
The antenna is positioned within the hollow portion of the spiral coil structure, creating a localized detection zone. This local positioning allows effective electromagnetic wave detection between the antenna and radio tag while the hollow portion structure contains the electromagnetic field, preventing excessive radiation to the surroundings
Solution Approach 2:
The antenna is nested within the hollow portion of the spiral coil, and the radio tag is nested within the hollow portion of the power receiving coil. This nested arrangement creates a confined electromagnetic interaction zone that improves detection capability while limiting electromagnetic radiation exposure
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 reliable detection and power transfer between the power supply and receiving sections, ensuring safety and efficiency even when the vehicle is parked at an angle, by narrowing the electromagnetic wave transmission range and enhancing position detection precision.
Implementation Method 1
a power supply apparatus on the ground... that supplies power using an electromagnetic force
Implementation Method 2
the communication section receiving, via the antenna, and detecting an electromagnetic wave transmitted by a radio tag
Data Source
AI summary
The electricity supply device (100) supplies electricity using electromagnetic force and opposes an external electricity reception coil (153a). An electricity supply coil (102a) has a hollow section (102b), and has a spiral shape. A reader (103) has an antenna disposed in the projected space resulting from projecting the hollow section (102b) in the central axial direction of the electricity supply coil (102a) and at a position more separated from the electricity reception coil (153a) than the opposing surface that opposes the electricity reception coil (153a) and is of the electricity supply coil (102a), and ID data transmitted by an RF tag (154) installed proximally to the electricity reception coil (153a) is received and detected by the antenna. An electricity-supply-side control unit (104) determines the presence/absence of an electricity reception coil (153a) on the basis of the ID data detected by the reader (103).