Wireless EV Charging Pad Communication Range for Interference-Free Pairing
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Solution Overview
Problem
Existing wireless power transfer systems for electric vehicles face challenges in simplified pairing processes and undisturbed communication during charging, particularly in multi-station environments, due to communication range issues and interference from other devices using the same frequency band.
Innovation Solution
A wireless power transfer arrangement with a communication link having a range less than twice the largest spatial extent of the primary pad, allowing for precise pairing and reduced interference, where the primary and secondary units include transceivers with antennas integrated into the pads to ensure communication occurs only between the intended charging station and vehicle, independent of orientation and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wireless communication link with long range is used for power transfer control, then communication coverage is improved, but interference and collisions between multiple stations increase
Solution Approach 1:
The patent applies local quality by restricting the communication range to be less than twice the largest spatial extent of the primary pad. This creates a localized communication zone that matches the physical power transfer area, ensuring that only vehicles within the immediate vicinity of a charging station can communicate with it. This resolves the contradiction by providing sufficient coverage for the power transfer area while preventing interference from distant stations.
2Adaptability or versatility
If wireless transceivers with long communication range are deployed, then system versatility is improved, but pairing complexity increases in multi-station environments
Solution Approach 1:
By limiting the communication range to less than twice the largest spatial extent of the primary pad, the system creates naturally isolated communication zones around each charging station. This eliminates the need for complex pairing protocols and station selection mechanisms, as vehicles can only communicate with the station physically present next to them, greatly simplifying the pairing process while maintaining versatility.
3Adaptability or versatility
If communication range is extended beyond the power transfer area, then system flexibility is improved, but communication reliability decreases due to interference
Solution Approach 1:
The patent establishes that the communication range should be less than twice the largest spatial extent of the primary pad, creating a localized communication field that coincides with the power transfer area. This ensures that communication signals are strong and reliable within the charging zone while naturally excluding distant interferers, thus maintaining both flexibility and reliability.
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 simplifies the pairing process and enhances communication reliability by ensuring only the intended vehicle and charging station communicate, reducing collisions and interference, thus enabling faster and more efficient power transfer.
Implementation Method 1
a primary pad for inducing a magnetic field into the airgap
Implementation Method 2
a secondary pad for receiving the power transferred through the magnetic field
Data Source
AI summary
A wireless power transfer arrangement (20) for a wireless power transfer across an airgap (9) by inductive coupling, for example for charging the battery (31) of an electric vehicle, includes a primary side (21) with a primary pad (22) for generating a magnetic field (28) into the airgap (9) and a secondary side (24) arranged on the other side of the airgap (9) that picks up the magnetic field (28) and provides the energy received through the magnetic field (28) to the battery (31). The primary side (21) is for example installed at a charging station and the secondary side (24) is comprised by the electric vehicle. In order to control the charging process during the power transfer, a wireless communication channel (38) is provided between the primary (21) and the secondary (24) by means of two wireless transceivers (35, 36). According to the invention, the wireless transceivers (35, 36) are adapted such that their communication range is less than twice a largest spatial extent of the primary pad. In this way, the communication between the charging station and the vehicle may not be received by other charging stations or vehicles located at the same charging area. And if the other vehicles and other charging stations of the same charging area are adapted according to the invention as well, their communication does not interfere with each other or otherwise disturb each other such that a complex and laborious pairing process may be avoided.