Non-contact Charging Coil Misalignment Power Adjustment
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Solution Overview
Problem
Non-contact charging systems face inefficiencies and safety concerns due to misalignment between power-feeding and power-receiving coils, leading to increased leakage electromagnetic fields that may exceed safety guidelines, especially when the coils are not properly aligned.
Innovation Solution
A non-contact charging apparatus equipped with a relative-position detection unit and a feeding-power changing unit that adjusts the power fed by the power-feeding coil based on the detected misalignment between the coils, ensuring efficient charging while maintaining the leakage electromagnetic field within safe limits by reducing power transmission as misalignment increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-contact charging is performed with high feeding power, then charging efficiency is improved, but leakage electromagnetic field intensity increases and may exceed safety guidelines
Solution Approach 1:
The patent applies dynamics by making the feeding power adjustable rather than fixed. The control unit dynamically changes the feeding power level based on real-time relative position detection between coils, allowing the system to optimize charging efficiency while preventing excessive electromagnetic field exposure when misalignment occurs.
Solution Approach 2:
The patent implements feedback through a closed-loop control system where the relative position detection unit continuously monitors coil alignment, and the control unit uses this information to adjust feeding power accordingly. This feedback mechanism ensures charging efficiency is maintained when aligned while automatically reducing power to prevent harmful electromagnetic fields when misaligned.
2Power
If feeding power is increased to maintain charging efficiency, then power transfer is improved, but the leakage electromagnetic field becomes larger and may affect human safety
Solution Approach 1:
The patent applies parameter changes by adjusting the feeding power parameter based on relative position. The control unit modifies the power level parameter in response to detected positional changes, ensuring optimal power transfer when coils are aligned while reducing power to safe levels when misalignment generates excessive leakage magnetic flux.
3Reliability
If the system continuously monitors relative position and adjusts feeding power, then safety is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the control unit to perform multiple functions: it manages power supply, processes position detection signals, determines relative position, and adjusts feeding power based on safety considerations. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while maintaining safety.
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 continues charging while maintaining the leakage electromagnetic field intensity within safe limits, preventing exposure to harmful levels, even when the relative position between the coils changes, thus ensuring safe and efficient power transfer.
Implementation Method 1
a power-feeding coil, a power-receiving coil, a relative-position detector, and a feeding-power changing device. The power-receiving coil is configured to receive power from the power-feeding coil in a non-contact manner
Data Source
AI summary
A non-contact charging apparatus includes a power-feeding coil, a power-receiving coil, a relative-position detector, and a feeding-power changing device. The power-receiving coil is configured to receive power from the power-feeding coil in a non-contact manner to charge a battery. The relative-position detector is configured to detect a distance between a center of the power-feeding coil and a center of the power-receiving coil. The feeding-power changing device is configured to decrease the power from the power-feeding coil to the power-receiving coil as the distance increases.