Hybrid Wireless Charging Coil Structure for Multi-Phase EV Pads
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Solution Overview
Problem
Conventional wireless power transfer systems for electric vehicles require separate chargers for single-phase and three-phase induction coils due to incompatible magnetic field distributions, necessitating multiple installations and increasing costs.
Innovation Solution
A hybrid charging coil structure that can selectively generate single-phase or three-phase magnetic field distributions using a single hardware configuration, comprising multiple primary and secondary coils arranged to overlap and operate based on input power phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate chargers are prepared for single-phase and three-phase induction coils, then compatibility with different vehicle types is improved, but device complexity and installation costs increase
Solution Approach 1:
The charging coil structure is designed to perform multiple functions by supporting both single-phase and three-phase operations. The coil can be configured to generate different magnetic field distributions based on the charging requirements, allowing a single charger to serve both single-phase induction vehicles and three-phase induction vehicles without requiring separate dedicated chargers for each type
Solution Approach 2:
The charging system employs dynamic configuration of the coil structure to adapt to different operating modes. By adjusting the phase differences between coils and reconfiguring the magnetic field distribution in real-time, the system can switch between single-phase and three-phase operations, providing versatile compatibility while maintaining a unified charger design
2Adaptability or versatility
If multiple chargers are installed to support different coil types, then service coverage is improved, but installation and maintenance costs increase
Solution Approach 1:
A single unified charger design incorporates the capability to serve both single-phase and three-phase induction vehicles through configurable coil structures. This eliminates the need for manufacturers to produce and deploy multiple types of chargers, thereby reducing manufacturing complexity, installation requirements, and ongoing maintenance costs while maintaining comprehensive service coverage
3Loss of energy
If different coil shapes are used for single-phase and three-phase operations, then power transfer efficiency is improved, but manufacturing and inventory complexity increase
Solution Approach 1:
Instead of using different fixed coil shapes for single-phase and three-phase operations, the invention employs a single coil structure that can dynamically reconfigure its magnetic field distribution. By adjusting the phase relationships and current distribution in the coil windings, the system optimizes power transfer efficiency for both operation modes without requiring separate physical coil designs, thereby reducing manufacturing and inventory complexity
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
This solution reduces manufacturing, installation, and maintenance costs by unifying coil shapes, enhances compatibility, and increases the number of charging stations, lowering entry barriers for electric vehicle adoption.
Implementation Method 1
a first primary coil arranged to surround a first center near a reference point (for example, an origin) in a central space; a second primary coil arranged to surround a second center near the reference point in the central space; a third primary coil arranged to surround a third center near the reference point in the central space
Implementation Method 2
a reception pad of a vehicle assembly (VA) mounted on the electric vehicle may form an inductive resonance coupling with a transmission pad of a ground assembly (GA) installed at a charging station or a charging spot and may charge the battery of the EV using electric power transferred from the ground assembly through the inductive resonance coupling
Data Source
AI summary
Disclosed is a wireless power transfer pad prepared to transfer wireless power to a reception pad, comprising a secondary coil. The wireless power transfer pad comprises three primary coils and a housing supporting the primary coils. The center of gravity of a center point of each of the three primary coils is arranged at the reference point.