EV Wireless Charging Alignment via Auxiliary Coil Feedback
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Solution Overview
Problem
Wireless charging systems for electric vehicles face alignment issues due to sensitive magnetic resonance technology, which is affected by the relative position of the transmitter and receiver coils, leading to inefficiencies and potential failure in power delivery, especially when drivers park their vehicles with significant misalignment.
Innovation Solution
A wireless charging system that utilizes auxiliary coils on the receiver pad to detect the magnetic field generated by the primary coil, providing alignment feedback to drivers and adjusting the position of the secondary coil to ensure optimal alignment, while also using phase-angle measurement and frequency tuning to maintain uniform voltage gain and efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic resonance technology is used for wireless charging, then contactless power transfer is achieved, but alignment sensitivity increases causing inefficiency
Solution Approach 1:
The system employs auxiliary coils to detect magnetic field strength and provides real-time feedback to the driver through visual or audible signals, enabling dynamic adjustment of vehicle position to maintain optimal alignment between transmitter and receiver coils during charging
Solution Approach 2:
The system performs preliminary alignment detection using auxiliary coils before main charging begins, allowing the driver to position the vehicle correctly in advance, thereby preventing efficiency losses from misalignment during the charging process
2Measurement precision
If auxiliary coils are added for alignment detection, then alignment precision improves, but device complexity increases
Solution Approach 1:
The receiver pad is segmented into multiple auxiliary coils arranged in specific patterns, with each coil detecting magnetic field strength in its local region, allowing precise determination of alignment status through comparison of individual coil outputs
Solution Approach 2:
The auxiliary coils serve as intermediary sensing elements that indirectly detect alignment conditions by measuring magnetic field strength, converting physical alignment information into electrical signals that can be processed by the control system
3Productivity
If frequency tuning is implemented for uniform voltage gain, then power transfer efficiency improves, but control complexity increases
Solution Approach 1:
The system dynamically adjusts the operating frequency of the magnetic resonance wireless charging system based on real-time alignment conditions and load requirements, enabling uniform voltage gain and optimal power transfer efficiency across varying operating conditions
Solution Approach 2:
The system changes the operating frequency parameter in response to alignment variations, maintaining resonant coupling between transmitter and receiver coils to ensure efficient power transfer even when alignment conditions change during charging
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 reduces misalignment errors, enhances charging efficiency, and ensures reliable power delivery by dynamically navigating the driver for proper alignment, thereby extending the travel range of electric vehicles and reducing battery volume and costs.
Implementation Method 1
a primary coil supplied by a power source... a secondary coil of the receiver pad... detect the magnetic field generated by the primary coil
Implementation Method 2
Wireless Charging (WC), which operates on magnetic resonance for Wireless Power Transfer (WPT)
Data Source
AI summary
Various examples are provided related to wireless charging of electric vehicles. In one example, a wireless charging system includes a transmitter pad including a primary coil supplied by a power source, and alignment control circuitry configured to determine an alignment condition of the transmitter pad with respect to a receiver pad of an electric vehicle. In another example, a wireless charging system includes a receiver pad including a secondary coil; and alignment processing circuitry configured to determine an alignment condition of the receiver pad with respect to a transmitter pad comprising a primary coil supplied by a power source. In another example, a method includes measuring output voltages of a plurality of auxiliary coils mounted on a secondary coil located over a primary coil of the wireless charging system and determining a lateral misalignment between the primary and secondary coils using the output voltages.