EV Wireless Charging Parking Control for Variable Power Demand
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Solution Overview
Problem
Existing contactless power transmission systems face challenges in efficiently supplying the required electric power to the power receiving side due to fixed coil alignments that maximize coupling, leading to potential under or over-supply issues based on fluctuating demand.
Innovation Solution
A control device and method that derive a target parking position for an electric vehicle based on required power information and power transmission efficiency, adjusting coil positions to match demand, allowing for optimal power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the coils are disposed at positions where the degree of coupling is high (centers facing each other), then power supply efficiency is improved, but the power supply side may not be able to output the electric power required by the power receiving side
Solution Approach 1:
The patent applies dynamics by making the coil position adjustable rather than fixed. The power receiving device can change its position relative to the power supply coil, allowing the system to dynamically select between different position relationships (first position relationship for high efficiency, second position relationship for high power output) based on real-time power requirements, thus resolving the contradiction between efficiency and power output capability
Solution Approach 2:
The patent changes the positional parameter of the coil arrangement. By allowing the power receiving device to adjust its position, the system can change from a fixed high-coupling configuration to variable configurations, enabling optimization of both power transmission efficiency and output power capacity according to different operational scenarios
2Loss of energy
If the coils are disposed at positions where the degree of coupling is high, then power supply efficiency is improved, but adaptability to fluctuating power demand is reduced
Solution Approach 1:
The system transitions from a static coil arrangement to a dynamic one where the power receiving device can adjust its position. This enables real-time adaptation to fluctuating power demands by selecting appropriate position relationships, thereby improving both energy efficiency and adaptability to varying operational conditions
Solution Approach 2:
The patent implements preliminary action by pre-establishing multiple position relationships (first and second position relationships) with different coupling characteristics. This allows the system to proactively select the most appropriate configuration before power transmission begins, ensuring optimal performance for anticipated power demands
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
Enhances the possibility of outputting the required electric power by aligning coil positions to match fluctuating demand, ensuring efficient power supply and utilization.
Implementation Method 1
electric power is exchanged using electromagnetic induction between a coil on a power supply side and a coil on a power receiving side
Data Source
AI summary
A control device derives a target parking position of an electric vehicle having a secondary coil in a parking space, when electric power is exchanged in a contactless manner between the electric vehicle and a power receiving device having a primary coil installed in the parking space and allowed to supply electric power received by the primary coil to a power grid. The control device includes an acquisition unit which acquires power information indicating required power, and a derivation unit which derives the target parking position based on the acquired power information and efficiency information indicating power transmission efficiency at each of position relationships between the primary coil and the secondary coil. The derivation unit derives the target parking position where a second position relationship different from a first position relationship in which the power transmission efficiency is the highest is established, according to an amount of the required power.