Dual Wireless Power Transfer with Cross-Talk Isolation
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Solution Overview
Problem
Current wireless power transfer systems face challenges in efficiently transferring power over longer distances and larger volumes due to decreased mutual inductance, increased electromagnetic interference, and heat generation, which limits their effectiveness and reliability, especially in multi-device charging scenarios.
Innovation Solution
The system incorporates custom-shaped components made from specific materials to enhance performance, including magnetic materials that concentrate magnetic fields, heat dissipation features, and firmware settings to manage heat and optimize power transfer, allowing for efficient power transmission at extended ranges and volumes while minimizing electromagnetic interference and heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If transmitter inductance and/or receiver inductance are increased to counteract distance effects, then coupling coefficient is improved, but equivalent series resistance increases causing more heat and greater energy losses
Solution Approach 1:
The patent changes the operating frequency parameter from conventional lower frequencies to a higher frequency range (6.78 MHz to 27.12 MHz). This frequency parameter change allows the system to achieve effective power transfer at extended distances without requiring excessive increases in inductance, thereby avoiding the associated heat generation and energy losses from high ESR components
Solution Approach 2:
The patent implements dynamic frequency selection and adjustment capabilities, allowing the system to adaptively choose optimal frequencies within the 6.78 MHz to 27.12 MHz range based on distance, load conditions, and environmental factors. This dynamic approach optimizes the coupling coefficient without permanently increasing inductance values, thus avoiding continuous heat generation and energy losses
2Length of stationary object
If transmitter inductance and/or receiver inductance are increased to achieve longer distance power transfer, then coupling coefficient is improved, but electromagnetic interference increases
Solution Approach 1:
The patent utilizes frequency parameter changes within the 6.78 MHz to 27.12 MHz range to achieve longer transmission distances without proportionally increasing inductance. By operating at optimized frequencies, the system maintains better magnetic field confinement and reduces electromagnetic interference while extending the effective power transfer distance
Solution Approach 2:
The patent converts the potential harmful effect of high-frequency operation (which could increase EMI) into a benefit by carefully selecting and controlling the frequency within the 6.78 MHz to 27.12 MHz range. This controlled high-frequency operation actually improves coupling efficiency and extends distance while the system's frequency management capabilities prevent excessive electromagnetic interference
3Productivity
If multiple devices are charged simultaneously at longer distances, then power transfer capability is improved, but cross talk and interference between devices increase
Solution Approach 1:
The patent segments the frequency spectrum by assigning different frequency channels within the 6.78 MHz to 27.12 MHz range to different devices being charged simultaneously. This frequency segmentation allows multiple devices to operate in parallel without significant cross-talk or interference, as each device communicates and receives power on its assigned frequency channel
Solution Approach 2:
The patent implements dynamic frequency allocation and assignment for multiple devices, where the system can dynamically assign different frequencies within the available range to different receivers based on distance, power requirements, and interference conditions. This dynamic frequency management enables simultaneous charging of multiple devices while actively managing and minimizing cross-talk and interference between them
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 more efficient and reliable wireless power transfer at distances up to 5 mm to 25 mm with wattage ranging from 1 nW to 30 W, reducing electromagnetic interference and heat issues, thus supporting multiple device charging without the need for active cooling, and maintaining system stability.
Implementation Method 1
magnetic materials that concentrate magnetic fields
Implementation Method 2
Inductive wireless power transfer occurs when magnetic fields created by a transmitting element induce an electric field, and hence electric current, in a receiving element
Implementation Method 3
heat dissipation features
Data Source
AI summary
A dual wireless power transfer system is disclosed having an input power supply providing power at a first voltage V1 and a first wireless power transmission system receiving power at a first power input from the input power supply, the first wireless power transmission system including a first transmitter antenna and a first driver for driving the first transmitter antenna for wireless power transmission to a first wireless receiver system and wireless receipt of data from the first receiver system, wherein data wirelessly received at the first transmitter antenna from the first receiver system at least partially feeds back onto the first power input. A second wireless power transmission system includes a second transmitter antenna and a second driver for driving the second transmitter antenna for wireless power transmission to a second wireless receiver system. A low voltage drop out receives power from the input power supply at V1 and provides power at a preselected lower voltage V2 to the second wireless power transmission system, such that V2 is independent of data received at the first transmitter antenna.