Wireless Power Relay Coil for Wide-Area Magnetic Resonance
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Solution Overview
Problem
Magnetic-coupling-type wireless power supply systems require complex configurations with multiple power transmission units and driving circuits, leading to increased size and cost, and inefficiencies in power transmission over wide areas.
Innovation Solution
A wireless power supply system utilizing a magnetic resonance technique with a relay coil and circuit that forms a resonant circuit with the power transmission and reception coils, optimizing coupling coefficients and distances to minimize power loss and maximize efficiency across a wide range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power transmission units are used to enable power reception regardless of position, then power transmission coverage is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent divides the power transmission function into multiple independent power transmission units, each capable of operating autonomously. This segmentation allows the system to provide wide coverage while keeping each unit simple, resolving the contradiction between coverage and complexity.
Solution Approach 2:
Each power transmission unit is designed to perform multiple functions: power transmission, relay functionality, and resonant circuit operation. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall system complexity while maintaining wide coverage.
2Reliability
If multiple power transmission units with individual driving circuits are deployed, then power transmission reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions (power transmission, relay operation, resonant circuit) into a single integrated power transmission unit. This merging reduces the total number of components and simplifies manufacturing processes, lowering costs while maintaining reliability through the unit's multifunctional design.
Solution Approach 2:
Each power transmission unit is designed to autonomously perform power transmission and relay functions without requiring complex external control systems. This self-service capability reduces the need for additional control circuits and simplifies the overall system, reducing manufacturing costs while ensuring reliable operation.
3Area of stationary object
If the power transmission surface area is increased, then power transmission coverage is improved, but the system requires more power transmission driving circuits
Solution Approach 1:
The large power transmission surface is divided into multiple smaller power transmission units distributed across the area. Each unit operates independently with its own simple driving circuit, achieving wide coverage without proportionally increasing the complexity of individual driving circuits.
Solution Approach 2:
Power transmission units function as intermediaries that can operate in two modes: as power transmission units when near the power reception device, and as relay units when farther away. This dual functionality allows the system to cover large areas efficiently without requiring a proportional increase in the number of active driving circuits at any given time.
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
Enables efficient wireless power transmission over a wide area with reduced power loss and lower costs by simplifying the configuration with fewer power transmission units and circuits, while maintaining high power efficiency.
Implementation Method 1
a magnetic resonance technique is employed and high-frequency power is wirelessly supplied from a power transmission device that includes a power transmission coil to a power reception device that includes a power reception coil
Implementation Method 2
power transmission is performed through coupling between a power transmission coil of a power transmission device and a power reception coil of a power reception device using a magnetic field
Data Source
AI summary
Provided is a wireless power supply system employing a magnetic resonance technique in which high-frequency power is wirelessly supplied from a power transmission device that includes a power transmission coil to a power reception device that includes a power reception coil that is at least magnetically coupled with the power transmission coil. The wireless power supply system includes a relay coil that is coupled with the power transmission coil and the power reception coil using at least a magnetic field, and a relay circuit that is connected to the relay coil and forms a resonant circuit together with the relay coil. When k1 represents a coupling coefficient between the power transmission coil and the power reception coil and k2 represents a coupling coefficient between the power transmission coil and the relay coil, a relationship k1≥k2 holds true.