Wireless Power Feeder Coil Selection for EV Resonance Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless power feeding technologies, particularly the magnetic field resonance type, face challenges in stabilizing power transmission efficiency due to the complexity of adjusting resonance frequency and the need for precise control of multiple feeding coils, which complicates the system configuration and reduces efficiency.
Innovation Solution
A wireless power feeder system that includes multiple feeding coils, a position signal receiver, and a power transmission control circuit to select the optimal feeding coil based on the receiving body's position, allowing for stable power transmission by adjusting the drive frequency to match the resonance frequency, and optionally using a selection circuit and phase detection circuit to ensure efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple feeding coils are used to cover larger area and maintain power transmission, then power supply reliability is improved, but system complexity increases due to the need for coil selection and frequency coordination
Solution Approach 1:
The system divides the power transmission area into multiple zones, each served by a dedicated feeding coil. The control unit segments the operation by selecting only the necessary coil based on receiver position, thereby maintaining reliability through coverage while reducing complexity by activating individual coils rather than managing all coils simultaneously
Solution Approach 2:
The control unit performs preliminary position detection to identify which feeding coil should be activated before power transmission begins. This preliminary action allows the system to pre-configure the resonance frequency and select the appropriate coil, avoiding the complexity of real-time coordination of multiple coils during operation
2Loss of energy
If resonance frequency is adjusted to maintain maximum power transmission efficiency, then power transmission efficiency is improved, but control complexity increases
Solution Approach 1:
The system changes the resonance frequency parameter dynamically based on the selected feeding coil and operating conditions. Each feeding coil has its optimized resonance frequency stored in the control unit, which automatically adjusts this parameter to maintain maximum power transmission efficiency without requiring complex real-time calculations
Solution Approach 2:
The control unit stores pre-determined resonance frequency values for each feeding coil, allowing the system to self-configure the optimal frequency based on position detection results. This eliminates the need for complex external control mechanisms and reduces control complexity while maintaining efficiency
3Adaptability or versatility
If software control is used to adjust resonance frequency, then frequency adjustment flexibility is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces complex software control mechanisms with a simplified control unit that uses pre-stored frequency values and basic position detection. This substitution maintains frequency adjustment flexibility through hardware-based selection while eliminating the need for complex software algorithms, thereby reducing system configuration 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
The system achieves stable and efficient wireless power transmission by dynamically selecting the appropriate feeding coil and adjusting the drive frequency, enhancing power transmission efficiency and reducing system complexity, enabling reliable charging of electric vehicles and other moving objects.
Implementation Method 1
a resonance circuit (LC circuit) is formed on both the power feeding side and power receiving side, respectively. The resonance frequency of the power feeding side resonance circuit and that of the power receiving side resonance circuit are made to coincide with each other. When the power feeding side resonance circuit is made to resonate at a resonance frequency fr1, the power receiving side resonance circuit resonates at a resonance frequency fr1.
Implementation Method 2
a resonance circuit (LC circuit) is formed on both the power feeding side and power receiving side, respectively. The resonance frequency of the power feeding side resonance circuit and that of the power receiving side resonance circuit are made to coincide with each other.
Data Source
AI summary
A wireless power feeder 116 feeds power from a feeding coil L2 in the ground to a receiving coil L3 incorporated in an EV by wireless using a magnetic field resonance phenomenon between the feeding coil L2 and receiving coil L3. A plurality of feeding coils L2a to L2d are buried in the ground. Receivers 112a to 112d are buried in corresponding respectively with the feeding coils L2a to L2d. The plurality of receivers 112 each receive a position signal transmitted from a transmitter 110 of the EV. A feeding coil circuit 120 supplies AC power to the feeding coil L2 corresponding to the receiver 112 that has received the position signal to allow the feeding coil L2 to feed power to the receiving coil L3 by wireless.