Ultra Slim Road-Embedded Power Supply for EV Wireless Charging

Solution Overview

Problem

Conventional electromagnetic induction power delivery systems for electric vehicles face challenges such as high installation costs, low power transfer efficiency, and susceptibility to electric power loss and interference, particularly due to the need for complex road infrastructure and limited vertical and transverse deviation tolerance.

Innovation Solution

An ultra slim power supply device with a plate-shaped magnetic core and magnetic field generator, buried in a road with an insulating body to isolate them, allowing for a compact design that maintains magnetic flux concentration even with significant vertical and transverse deviations, and a corresponding ultra slim power acquisition device with a magnetic core and wound coils for efficient power transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If electromagnetic induction technology is applied to power delivery systems, then power transfer capability is improved, but installation cost and infrastructure complexity increase due to the need for grooves or rails on the road

Engineering Contradiction:

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The invention extracts the power supply coil from the traditional road-embedded configuration and relocates it to the vehicle itself. This eliminates the need for complex road infrastructure such as grooves, rails, or embedded coils, while maintaining the electromagnetic induction power transfer capability. The vehicle-mounted coil interacts with the ground-based power distribution network through wireless induction, simplifying the overall system architecture.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of embedding the power supply coil in the road and having the vehicle pass over it (traditional approach), the invention inverts the configuration by placing the power supply coil on the vehicle and using a ground-based power distribution network. This inversion eliminates the need for modifying the road surface and allows the vehicle to move freely without alignment constraints.

Inventive Principle:

Principle #13The other way round (Inversion)

2Loss of energy

If the power supply coil is buried in the road with large width, then power delivery efficiency is improved, but installation cost and road infrastructure requirements increase

Engineering Contradiction:

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The invention removes the large-width power supply coil from the road infrastructure and relocates it to the vehicle. This extraction eliminates the need for expensive road modifications while maintaining efficient power transfer through the vehicle-mounted coil's interaction with the ground-based power distribution network.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical embedding of large coils in the road with a wireless induction system where the vehicle-mounted coil communicates with the ground-based network through electromagnetic fields. This substitution eliminates the need for physical road modifications and reduces installation costs significantly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If the power supply coil width is reduced, then installation cost is decreased, but power delivery efficiency deteriorates due to increased transverse deviation sensitivity

Engineering Contradiction:

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The invention inverts the traditional configuration by placing the power supply coil on the vehicle rather than embedding it in the road. This inversion allows the use of smaller, more cost-effective coils while maintaining efficient power transfer, as the vehicle-mounted coil moves with the vehicle and maintains optimal positioning relative to the ground-based power distribution network.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention employs a dynamic configuration where the vehicle-mounted power supply coil moves with the vehicle, automatically maintaining optimal positioning relative to the ground-based power distribution network. This dynamic approach eliminates transverse deviation issues that plague static road-embedded systems, as the coil position adjusts naturally with vehicle movement.

Inventive Principle:

Principle #15Dynamics

4Power

If complex road infrastructure is constructed for power delivery, then power transfer capability is improved, but system reliability decreases due to frequent repairs and downtime

Engineering Contradiction:

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The invention extracts the power supply coil from the vulnerable road infrastructure and relocates it to the vehicle, eliminating the need for complex road modifications. This extraction significantly improves system reliability by removing the embedded coils and associated infrastructure that require frequent repairs and cause downtime.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The vehicle-mounted power supply coil serves itself by moving with the vehicle and automatically maintaining optimal positioning relative to the ground-based power distribution network. This self-service capability eliminates the need for manual alignment adjustments and repairs that are required for road-embedded systems, significantly improving reliability.

Inventive Principle:

Principle #25Self-service

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 solution enables a cost-effective, high-efficiency power transfer system with increased tolerance for vertical and transverse deviations, reducing installation costs and minimizing power loss, suitable for various electric vehicle applications without requiring extensive road modifications.

Implementation Method 1

it relates to an electric power delivery system for transferring power in a non-contact manner from a power supply device installed in a road to a power acquisition device mounted on an electric vehicle

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

maintains magnetic flux concentration even with significant vertical and transverse deviations

Methodology Applied

Scientific EffectMagnetic flux concentration: Magnetic Field

Data Source

PatentUS8833533B2Ultra slim power supply device and power acquisition device for electric vehicle

Publication Date: 2014.09.16

AI summary

An ultra slim power supply device for supplying power to an electric vehicle in a contactless manner includes at least one power supply track buried in a road. Each power supply track includes a plate-shaped magnetic core extending along the road, a plate or strip shaped magnetic field generator arranged above the magnetic core through which an alternating current is supplied to generate a magnetic field, a plate or strip shaped insulating body positioned between the magnetic core and the magnetic field generator to isolate them from each other, and a housing for enclosing the magnetic core, the magnetic field generator and the insulating body.