Multi-Antenna Wireless Power Circuit for Wider Coupling
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in increasing the coupling envelope and enabling multiple device coupling without significantly increasing the bill of materials, particularly at high frequencies where large coils are difficult to design due to self-resonant frequency constraints and low coupling efficiency.
Innovation Solution
A wireless power transmission system utilizing two transmission antennas connected in series or parallel to a common power conditioning system, which includes distributed capacitors and interdigitated capacitors, allowing efficient power transfer to multiple receivers while minimizing the bill of materials and improving coil sensitivity and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transmission antennas are used to extend coupling envelope and enable multiple device coupling, then the power transmission capability and coupling area are improved, but the bill of materials and system cost increase drastically due to requiring separate amplifier circuitry for each antenna
Solution Approach 1:
The patent merges multiple transmission antennas into a single integrated antenna structure that shares common amplifier circuitry and control electronics. This consolidation allows the system to maintain multiple device coupling capability while significantly reducing the bill of materials by eliminating redundant amplifier components for each antenna element.
Solution Approach 2:
The integrated antenna system is designed to perform multiple functions simultaneously - it can couple with multiple devices at once, operate across different frequency ranges, and provide both power transmission and data communication capabilities through a single unified structure rather than requiring separate specialized components for each function.
2Area of stationary object
If large coil antennas are designed at high frequencies, then the coupling envelope can be extended, but self-resonant frequency constraints and low coupling efficiency make the design difficult and compromise system performance
Solution Approach 1:
The patent employs parameter changes by utilizing frequency tuning capabilities within the integrated antenna system. The antenna structure is designed to operate across a range of frequencies (including both high and low frequency ranges), allowing optimization of coupling efficiency at different operating conditions while maintaining large physical dimensions for extended coupling envelope.
Solution Approach 2:
The integrated antenna system incorporates dynamic frequency adjustment and adaptive impedance matching capabilities that allow the antenna to optimize its performance characteristics in real-time based on the coupling conditions with receiver devices, thereby maintaining high coupling efficiency across varying operational scenarios.
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, single, and simultaneous power transfer to multiple devices with a lower-cost design, increasing coil-to-coil efficiency by 6% and reducing impedance shifts due to metal by 52%, while maintaining a robust and thin form factor.
Implementation Method 1
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Implementation Method 2
magnetic fields created by a transmitting element induce an electric field
Data Source
AI summary
A wireless power transmission system includes, at least, a first transmission antenna and a second transmission antenna, both in electrical connection with a common power conditioning system of the system. The first transmission antenna transmits output power and includes a first pole and a second pole, while the second transmission antenna also transmits the output power and includes a third pole and a fourth pole. The first and second transmission antennas are in electrical connection with the power conditioning system via at least one of the first pole and the second pole and at least one of the third pole and the fourth pole. Further, at least one of the first pole and the second pole is in electrical connection with at least one of the third pole and the fourth pole.