Multi-Pickup Coil Layout for High-Density EV Wireless Charging
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Solution Overview
Problem
The performance of circular pickup coils in wireless charging systems for electric vehicles and industrial equipment is limited, particularly when considering both stopping and driving scenarios, leading to restricted capacity and efficiency per unit area.
Innovation Solution
A multi-pickup coil design is introduced, comprising a central coil and wing coils arranged on either side, with an outer coil surrounding them, optimized to enhance magnetic field focusing and saturation control, reducing heat accumulation and improving voltage output while maintaining efficient current direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular pickup coil is used for wireless charging, then the structure is simple and easy to manufacture, but the capacity and efficiency per unit area are limited
Solution Approach 1:
The pickup coil is divided into multiple independent coils (first pickup coil, second pickup coil, third pickup coil, and fourth pickup coil) arranged in a specific pattern. Each coil contributes to the overall magnetic field, increasing the total charging capacity while maintaining manageable individual coil structures that are easier to manufacture than a single large complex coil.
Solution Approach 2:
The patent transitions from a symmetrical circular coil design to an asymmetrical multi-coil arrangement where coils are positioned at specific locations (front, rear, left, right) with specific orientations. This asymmetric configuration optimizes magnetic field distribution for both stopping and driving scenarios, significantly improving charging efficiency per unit area.
2Device complexity
If a circular pickup coil is used for wireless charging, then the design is simple, but the performance is limited in both stopping and driving scenarios
Solution Approach 1:
The pickup system uses four separate pickup coils instead of one circular coil, allowing each coil to be optimized for specific positions and orientations. This segmentation enables reliable charging performance whether the vehicle is stopped or moving, as the multi-coil arrangement ensures consistent magnetic field coverage from all directions.
Solution Approach 2:
The patent adds spatial dimensionality to the coil arrangement by positioning coils at different locations (front, rear, left, right) and orientations around the power supply rail. This three-dimensional configuration ensures reliable magnetic coupling whether the vehicle is stationary or in motion, overcoming the limitations of a two-dimensional circular coil design.
3Productivity
If the pickup coil area is increased to improve capacity, then the charging capacity increases, but the cost and device complexity increase
Solution Approach 1:
Instead of using one large area coil, the patent segments the total coil area into four smaller coils arranged strategically around the power supply rail. This achieves the same or greater total charging capacity while reducing the complexity of each individual coil and simplifying manufacturing compared to a single large coil.
Solution Approach 2:
The patent combines multiple smaller pickup coils into a unified system that works together to provide enhanced charging capacity. By merging the output of four strategically positioned coils, the system achieves high capacity without requiring any single coil to be overly complex or large in area.
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 multi-pickup coil design achieves higher capacity and efficiency per unit area, reduces costs, and effectively manages heat generation and magnetic field saturation, offering improved performance in both stopping and driving wireless charging scenarios compared to conventional circular coil systems.
Implementation Method 1
the power required for driving is supplied by the principle of electromagnetic induction between the power supply line and the power pickup apparatus installed in the electric vehicle
Data Source
AI summary
Disclosed are a multi pickup coil for wireless charging of an electric vehicle such as an electric bus or an electric passenger car and industrial equipment while stopping or driving, and a pickup apparatus having the multi pickup coil. The multi pickup coil and the pickup apparatus provide high-capacity and high-efficiency wireless charging per unit area by performing performance enhancement through an optimal design in order to overcome the limitations of a circular pickup coil.