Resonant Wireless Power Transfer for Electric Vehicle Charging
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Solution Overview
Problem
Current wireless power transfer systems face inefficiencies and alignment challenges when charging electric vehicles, particularly due to distance and alignment requirements between transmit and receive antennas, which affect power transfer efficiency and regulatory compliance.
Innovation Solution
The implementation of a wireless power transfer system using magnetic resonance in a coupling mode region between a charging base and a battery electric vehicle, with adaptable power converters and antennas configured for resonance near the operating frequency, allowing for load adaptation and power control to maintain efficiency across varying coupling coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If plane wave radiation coupling is used between transmit and receive antennas, then wireless power transmission can be achieved, but power coupling falls off quickly with distance making charging over reasonable distances difficult
Solution Approach 1:
The patent changes the operating parameters by using resonant frequency matching between transmit and receive antennas. This resonance condition creates strong magnetic coupling that maintains power transfer efficiency over distances of several feet, dramatically improving upon the rapid distance-dependent decay of conventional plane wave radiation coupling methods
2Quantity of substance
If inductive coupling between transmit antenna and receive antenna is used, then multiple devices can be charged simultaneously, but spacing between antennas must be very close within millimeters
Solution Approach 1:
The patent employs resonant frequency matching to enhance the coupling coefficient between antennas. This resonance condition allows magnetic field energy to be efficiently transferred over distances of several feet, enabling multiple devices to be charged simultaneously at practical spacing distances rather than requiring millimeter-scale proximity
3Ease of operation
If transmit and receive antennas are misaligned in distance and alignment, then wireless charging system becomes simpler, but power transfer efficiency decreases
Solution Approach 1:
The patent uses resonant oscillation at matched frequencies between transmit and receive antennas to create strong magnetic coupling. This resonance condition maintains efficient power transfer even when antennas are misaligned in distance or orientation, as the resonant magnetic fields can couple effectively over larger tolerance ranges compared to non-resonant inductive coupling
Solution Approach 2:
The system dynamically adjusts operating parameters including frequency tuning and impedance matching to maintain optimal power transfer efficiency under varying alignment conditions. The resonant frequency matching creates a robust coupling that is less sensitive to misalignment, allowing the system to maintain efficiency across a broader range of operational configurations
4Ease of operation
If wireless power transmission is used, then convenience is improved, but efficiency is reduced compared to wired transfer
Solution Approach 1:
The patent uses resonant frequency matching to dramatically improve wireless power transmission efficiency. By tuning both transmit and receive antennas to the same resonant frequency, the system achieves strong magnetic coupling that minimizes energy loss, making wireless transfer efficiency comparable to or exceeding conventional wired methods while maintaining charging convenience
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 approach enables efficient wireless power transfer with improved alignment and regulatory compliance, allowing for convenient, reliable, and efficient charging of electric vehicles, while also enabling bidirectional energy transfer for Vehicle-to-Grid capabilities.
Implementation Method 1
wireless power transfer using magnetic resonance in a coupling mode region between a charging base (CB) and a remote system
Implementation Method 2
inductive coupling between a transmit antenna embedded, for example, in a 'charging' mat or surface and a receive antenna
Data Source
AI summary
Exemplary embodiments are directed to wireless power transfer using magnetic resonance in a coupling mode region between a charging base (CB) and a remote system such as a battery electric vehicle (BEV). The wireless power transfer can occur from the CB to the remote system and from the remote system to the CB. Load adaptation and power control methods can be employed to adjust the amount of power transferred over the wireless power link, while maintaining transfer efficiency.