Wireless Power Transfer Repeater Coil Additive Field Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic-resonance wireless power transfer faces challenges in efficiently transferring power over longer distances due to the rapid decrease in magnetic field strength with increasing distance, limiting the power transfer area and distance.
Innovation Solution
A wireless power transfer device comprising a first and second transmitter coil, a repeater coil magnetically coupled to both, and power amplifiers generating synchronized drive signals to create additive magnetic fields, enhancing the magnetic field strength and extending the power transfer distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If magnetic-resonance wireless power transfer is used, then power can be transferred wirelessly to electronic devices, but the magnetic field strength decreases rapidly with increasing distance, limiting the power transfer area and distance
Solution Approach 1:
The patent combines multiple transmitter coils into a unified wireless power transfer system with a common repeater coil. Multiple drive signals from separate power amplifiers are synchronized and combined to create additive magnetic fields, merging their effects to achieve stronger overall magnetic field strength and extended power transfer distance beyond what a single transmitter coil could provide
Solution Approach 2:
The repeater coil serves as an intermediary element that magnetically couples to multiple transmitter coils and transfers their combined magnetic field energy to the receiver coil. This mediator approach allows the system to extend power transfer distance by creating a relay path for magnetic energy transmission, overcoming the rapid decay limitation of direct transmitter-receiver coupling
2Area of stationary object
If a single transmitter coil is used, then the device structure is simple, but the power transfer area and distance are limited
Solution Approach 1:
The wireless power transfer system is segmented into multiple independent transmitter coil units, each with its own power amplifier. These modular segments can be independently configured and synchronized, allowing the system to expand power transfer area by adding more segments while maintaining manageable complexity through standardized interfaces and control
3Power
If multiple transmitter coils with synchronized drive signals are used, then the magnetic fields combine additively to increase field strength, but the device complexity increases
Solution Approach 1:
The repeater coil performs multiple functions: it magnetically couples to multiple different transmitter coils, receives combined magnetic field energy from various sources, and transfers this energy to the receiver coil. This universal intermediary component allows the system to achieve higher power output through multiple transmitter coils without proportionally increasing the complexity of the power transfer mechanism itself
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 solution increases the power transfer area and distance by generating a stronger magnetic field through additive combination of magnetic fields, allowing efficient power transfer to receivers up to 8.5 centimeters away, with potential for further expansion using multiple transmitter coils and modular arrays.
Implementation Method 1
a first transmitter coil configured to generate a first magnetic field in response to receiving a first drive signal... a second transmitter coil configured to generate a second magnetic field... a repeater coil magnetically coupled to the first transmitter coil and the second transmitter coil
Data Source
AI summary
A wireless power transfer device including a first power amplifier configured to generate a first drive signal, a second power amplifier configured to generate a second drive signal, a first transmitter coil configured to generate a first magnetic field having a first magnitude in response to receiving the first drive signal, and a second transmitter coil configured to generate a second magnetic field having a second magnitude in response to receiving the second drive signal. The wireless power transfer device also includes a repeater coil magnetically coupled to the first transmitter coil and the second transmitter coil, and configured to generate a third magnetic field having a third magnitude. The third magnitude is greater than the first magnitude and greater than the second magnitude. The repeater coil is configured to magnetically transfer power to an external device.