Wireless Power Feeder with Segmented Coils for Moving EVs
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Solution Overview
Problem
Current wireless power feeding technologies face challenges in efficiently and safely powering moving objects, such as electric vehicles, due to poor workability and safety concerns with connectors and cables, and the need for continuous power transmission while maintaining high power transmission efficiency.
Innovation Solution
A wireless power feeder system with multiple feeding coils arranged along the moving object's path and a power supply circuit that selectively activates coils as the object moves, ensuring continuous power delivery by adjusting drive frequency and inductance to maintain resonance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power feeding is used to power a moving object, then safety and workability are improved by eliminating connectors and cables, but power transmission efficiency deteriorates due to distance and movement
Solution Approach 1:
The system divides the power transmission path into multiple segments with feeding coils arranged at different positions. By segmenting the transmission path and using multiple coils, the system maintains efficient power transmission over longer distances while keeping each individual transmission segment within an efficient range.
Solution Approach 2:
The system activates feeding coils in advance before the moving object reaches them. The power supply circuit prepares and activates the appropriate feeding coil ahead of time, ensuring continuous and efficient power transmission without interruption or loss due to delayed activation.
2Productivity
If multiple feeding coils are arranged along the moving direction to enable continuous power transmission, then productivity is improved, but device complexity increases
Solution Approach 1:
The system dynamically controls the activation and deactivation of feeding coils based on the real-time position of the moving object. The power supply circuit switches between different feeding coils as the object moves, optimizing power transmission while managing system complexity through intelligent control rather than static configuration.
Solution Approach 2:
The system uses periodic activation of feeding coils as the moving object passes through different zones. Each feeding coil is activated in a periodic sequence corresponding to the object's movement, enabling continuous power transmission through rhythmic, coordinated activation of multiple coils.
3Loss of time
If the power supply circuit activates feeding coils in advance, then power transmission timeliness is improved, but energy loss increases due to prolonged activation
Solution Approach 1:
The power supply circuit activates feeding coils in advance before the moving object reaches their optimal position, ensuring timely power transmission. This preliminary activation prevents delays and ensures continuous power supply to the moving object.
Solution Approach 2:
The system uses periodic activation patterns where feeding coils are switched on and off in coordination with the moving object's position. This periodic action ensures coils are activated only when needed and deactivated promptly after serving their purpose, minimizing unnecessary energy consumption while maintaining timely power transmission.
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 and safe wireless power feeding to moving objects by eliminating the need for connectors and cables, ensuring timely and stable power transmission even at high speeds, while maintaining high power transmission efficiency.
Implementation Method 1
When AC power is fed to the exciting coil, current also flows in the feeding coil according to the principle of electromagnetic induction. When the feeding coil generates a magnetic field to cause the feeding coil and receiving coil to magnetically resonate
Implementation Method 2
When the feeding coil generates a magnetic field to cause the feeding coil and receiving coil to magnetically resonate, high current flows in the receiving coil. By utilizing the magnetic field resonance phenomenon, high power transmission efficiency can be achieved
Data Source
AI summary
To increase efficiency of wireless power feeding to a moving object in wireless power feeding. A wireless power feeder 116 feeds power by wireless from a plurality of feeding coils L2 to an EV 108 including a receiving coil L3. The feeding coils L2 are arranged along a moving direction of the EV 108 and receive power from a power supply circuit including a plurality of power transmission control circuits 200. The power supply circuit 102 makes a first feeding coil L2 supply AC power to the EV 108 when the EV 108 passes through the first feeding coil L2 and, at the same time, prepares power feeding from a second feeding coil L2 through which the EV 108 has not passed.