Vehicle Charger Coil Position Detection Without Interference
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Solution Overview
Problem
The reliability of vehicle control systems, such as keyless entry, is compromised by electromagnetic interference from the charging coil in wireless vehicle-mounted chargers, limiting the usability of the charger, especially when the charging coil cannot be energized, making it difficult to detect the relative position of the primary and secondary coils for alignment.
Innovation Solution
A vehicle-mounted charger with a control unit that manages primary coil energization, a position detection unit to determine the positional relationship between the coils, and a notification unit to inform the user, allowing alignment and charging preparation even when the primary coil is not energized, enhancing usability by guiding the user to align the coils correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging coil is energized to perform wireless charging, then charging function is achieved, but electromagnetic interference with vehicle control systems occurs
Solution Approach 1:
The system performs preliminary actions (position detection and notification) before energizing the charging coil. The position detection unit detects the relative position between primary and secondary coils, and the notification unit guides the user to achieve proper alignment, all while the charging coil remains de-energized to avoid electromagnetic interference with vehicle control systems.
2Reliability
If the charging coil is not energized to avoid electromagnetic interference, then vehicle control reliability is maintained, but position detection capability is lost
Solution Approach 1:
The system segments the charging process into distinct phases: a preparation phase where position detection is performed with the charging coil de-energized, and a charging phase where the coil is energized. This segmentation allows position detection to occur without electromagnetic interference, resolving the contradiction between maintaining vehicle control reliability and enabling position detection.
3Reliability
If the charging coil is limited in energization to avoid interference, then vehicle control reliability is improved, but usability of the charger deteriorates
Solution Approach 1:
The notification unit provides feedback to the user about the relative position between the primary and secondary coils, guiding them to achieve proper alignment. This feedback mechanism enables the system to maintain the charging coil in a de-energized state while still providing useful functionality, thereby improving usability without compromising vehicle control 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
The charger improves usability by enabling immediate charging operation preparation as soon as the user enters the vehicle, reducing interference with vehicle control systems and ensuring efficient charging alignment, thus enhancing the overall charging experience.
Implementation Method 1
the relative position of a primary coil for power transmission and a secondary coil for power reception is detected by comparing the voltage generated in the secondary coil with a reference voltage
Data Source
AI summary
A vehicle-mounted charger which performs wireless charging includes a control unit which controls energization of a primary coil, a position detection unit which detects a positional relationship between the primary coil and a secondary coil of an apparatus to be charged such as a mobile phone, and a notification unit which performs notification to the user. In a state where the energization of the primary coil is not performed, the control unit acquires the positional relationship between the primary coil and the secondary coil which is detected by the position detection unit, and controls the notification unit to notify of the positional relationship.