Multi-Coil Wireless Charging for High Power With Lower EMI
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Solution Overview
Problem
Conventional wireless power systems face inefficiencies and electromagnetic interference (EMI) when transferring high power levels, as they rely on a single primary and secondary coil alignment, which can be misaligned, reducing efficiency and increasing EMI.
Innovation Solution
The implementation of a wireless power system using multiple primary and secondary coils, where each primary coil transmits a low power signal to a corresponding secondary coil, allowing the receiving apparatus to combine power from multiple coils to provide a high-power signal to a load, while optimizing alignment and reducing EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single primary coil and secondary coil alignment is used for wireless power transfer, then the system structure is simple, but the alignment difficulty reduces efficiency and increases EMI when transferring high power levels
Solution Approach 1:
The patent divides the single coil system into multiple primary coils and multiple secondary coils. Each primary coil can independently transmit power to corresponding secondary coils, allowing parallel power transfer paths that reduce dependence on perfect alignment between single coils while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent transitions from a one-to-one coil pairing to a many-to-many coil configuration, adding dimensional complexity to the system architecture. This multi-dimensional approach provides redundant power transfer paths and allows the system to maintain efficiency even when individual coil alignments are suboptimal
2Ease of manufacture
If a single primary coil and secondary coil alignment is used for wireless power transfer, then the system is easy to implement, but EMI increases when transferring high power levels
Solution Approach 1:
By segmenting the power transfer into multiple lower-power coil pairs instead of one high-power pair, the patent reduces the EMI generated by any single coil while achieving the same total power transfer. Each coil operates at lower power levels, reducing electromagnetic interference proportionally
Solution Approach 2:
The patent combines the output from multiple secondary coils to achieve high total power transfer. By merging multiple low-power signals into a combined high-power output, the system achieves high power transfer capability without the EMI problems associated with single high-power transmission
3Power
If multiple primary and secondary coils are used to transmit and combine low power signals, then high power requirements are supported, but the device complexity increases
Solution Approach 1:
The patent segments the high-power transmission task into multiple low-power coil pairs. Each primary-secondary coil pair handles a portion of the total power requirement, allowing the system to scale power capacity by adding modular coil units rather than requiring a single complex high-power coil system
Solution Approach 2:
The patent designs the multiple coils to perform the same basic function of wireless power transfer. Each coil pair is a universal module that can independently transmit and receive power, and the system can dynamically activate different coil combinations based on power requirements and alignment conditions, providing multi-functional flexibility
4Reliability
If multiple primary and secondary coils are used to transmit and combine low power signals, then power transfer efficiency is enhanced, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent implements feedback mechanisms to monitor and control the power transfer from multiple coil pairs. By continuously measuring the alignment and power transfer efficiency of individual coil pairs and adjusting their operation accordingly, the system optimizes overall efficiency while providing measurable data for system control and coordination
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 enhances the efficiency of wireless power transfer, reduces EMI, and supports higher power requirements for electronic devices by utilizing multiple low power signals, thereby improving overall system performance and reducing costs.
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
Implementation Method 2
The power may be transferred using resonant or non-resonant inductive coupling between the primary coil and the secondary coil
Data Source
AI summary
This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for wireless power transmission. A wireless power transmission apparatus (such as a charging pad) may provide multiple wireless power signals to a wireless power receiving apparatus. 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 wireless energy 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.