Multi-Coil Wireless Power Reception for Load Sharing and Low EMI
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Solution Overview
Problem
Conventional wireless power systems struggle to provide sufficient power for newer electronic devices and are inefficient due to electromagnetic interference and misalignment issues, especially when using higher power transfer capabilities.
Innovation Solution
A wireless power receiving apparatus with multiple secondary coils and RX controllers that combine power from different primary coils, utilizing droop configurations to manage power distribution and alignment, reducing electromagnetic interference and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional wireless power systems use higher power transfer capabilities, then power delivery increases, but electromagnetic interference increases and efficiency decreases
Solution Approach 1:
The receiving apparatus is divided into multiple independent RX circuits, each with its own secondary coil and controller. Each RX circuit operates at lower power levels individually, reducing electromagnetic interference per circuit, while the combined output of multiple circuits achieves the required total power delivery to the load.
2Power
If conventional wireless power systems use higher power transfer capabilities, then power delivery increases, but efficiency decreases
Solution Approach 1:
The system segments power reception into multiple RX circuits that can be independently controlled. Each circuit operates in an optimized efficiency range, and the power combination circuit efficiently aggregates their outputs, achieving high total power delivery while maintaining overall system efficiency.
Solution Approach 2:
The RX controllers dynamically adjust the operation of each RX circuit based on real-time conditions such as alignment metrics and power requirements. This dynamic control allows the system to optimize efficiency at each circuit level while adapting to changing load demands, maintaining high overall efficiency even at elevated power levels.
3Power
If multiple RX circuits are used to combine power, then power delivery increases, but device complexity increases
Solution Approach 1:
The receiving apparatus uses multiple independent RX circuits with individual secondary coils and controllers. Each circuit is a self-contained module that can be independently managed, allowing the system to scale power capacity by adding modules rather than redesigning the entire system, thus managing complexity through standardization.
Solution Approach 2:
Each RX circuit is designed as a universal module capable of operating independently or in combination with other identical modules. The power combination circuit provides a standardized interface for aggregating power from any number of RX circuits, enabling flexible configuration without increasing per-module complexity.
4Loss of energy
If droop configuration is used to manage power distribution, then power distribution efficiency improves, but control complexity increases
Solution Approach 1:
Each RX controller autonomously manages its own RX circuit's power output based on droop configuration parameters. The controllers self-regulate their current contribution to the power combination circuit based on voltage levels and alignment metrics, eliminating the need for complex centralized control while maintaining efficient power distribution.
Solution Approach 2:
The droop configuration implements a feedback mechanism where each RX controller continuously monitors voltage levels and adjusts its current output accordingly. This decentralized feedback control enables efficient power distribution across multiple circuits while keeping individual controller complexity low, as each controller only needs to respond to local voltage conditions.
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 effectively delivers higher power to electronic devices with reduced electromagnetic interference and improved efficiency by combining power from multiple secondary coils, supporting devices that require greater power without increasing complexity or cost.
Implementation Method 1
a wireless power transmission apparatus may include a primary coil that produces an electromagnetic field. The electromagnetic field may induce a voltage in a secondary coil of a wireless power receiving apparatus when the secondary coil is placed in proximity to the primary coil.
Implementation Method 2
The power combination circuit may be configured to combine the wireless power received by the plurality of RX circuits and provide the combined wireless power to a load associated with the wireless power receiving apparatus.
Data Source
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AI summary
This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for wireless power transmission. A wireless power receiving apparatus may be configured to combine power from multiple wireless power signals. In some implementations, the wireless power receiving apparatus may combine wireless power received from multiple secondary coils to provide a combined wireless power signal to a load, such as a battery charger or electronic device. In some implementations, each set of primary coil and secondary coil may utilize low power wireless power signals (such as 15 Watts or less) in accordance with a wireless charging standard. By combining power from multiple low power wireless power signals, the wireless power receiving apparatus may support higher power requirements of an electronic device. The disclosed designs may minimize electromagnetic interference (EMI) and provide greater efficiency of wireless power transfer.