RF Power Source for Wireless Transmitter Adaptability
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in efficiently transmitting power across variable-sized areas with multiple receiver devices while maintaining a consistent characteristic frequency and minimizing energy loss due to stray electromagnetic fields.
Innovation Solution
A variable form factor transmitter system utilizing a string of distributed capacitors and inductive segments integrated onto a laminated material sheet, which adapts to different form factors by maintaining a characteristic frequency within the ISM radio band, reducing stray electric fields and energy loss through inductive coupling and resonant frequency matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless power transfer system uses a fixed-frequency transmitter design, then the system structure is simple, but the system cannot efficiently transfer power across variable-sized areas with multiple receiver devices
Solution Approach 1:
The transmitter is divided into multiple independently controllable coil segments, each capable of being activated or deactivated based on the required power transfer area and receiver positions. This segmentation allows the system to adapt to variable-sized areas by selectively enabling only the necessary segments, rather than requiring a complete redesign for each area size.
Solution Approach 2:
The transmitter implements dynamic frequency adjustment capability, allowing the operating frequency to be changed in real-time based on the configuration of receiver devices and the required power transfer area. This dynamic adaptation enables efficient power transfer across variable-sized areas without requiring multiple fixed-frequency transmitter designs.
2Power
If the transmitter operates at higher power levels to serve multiple receivers, then power delivery capability is improved, but energy loss due to stray electromagnetic fields increases
Solution Approach 1:
The transmitter employs local quality optimization by adjusting the operating frequency and power distribution specific to each active coil segment based on the location and power requirements of nearby receivers. This localized optimization ensures that power is transmitted at the minimum necessary level for each region, reducing stray electromagnetic fields and energy loss while maintaining adequate power delivery to multiple receivers.
Solution Approach 2:
The system implements feedback control mechanisms that continuously monitor the power transfer efficiency and electromagnetic field distribution. Based on this feedback, the transmitter dynamically adjusts the operating frequency and power allocation to minimize energy loss due to stray fields while maintaining sufficient power delivery to all active receiver devices.
3Productivity
If the transmitter uses a higher operating frequency to improve power transfer efficiency, then power transfer efficiency is improved, but radiation losses and interference with other devices increase
Solution Approach 1:
The transmitter utilizes parameter changes by dynamically adjusting the operating frequency within a range of frequencies rather than operating at a single fixed frequency. This allows the system to optimize power transfer efficiency by selecting the most appropriate frequency for each specific configuration of receivers and environmental conditions, while avoiding frequencies that would cause excessive radiation losses or interference with other devices.
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 transfers power across varying wireless power transfer areas with multiple receiver devices, maintaining efficiency and safety by confining electrical fields and reducing energy loss, while ensuring consistent power delivery regardless of the transmitter's form factor or location.
Implementation Method 1
The transmitter is connected to a source of power and converts the power to a time-varying electromagnetic field
Implementation Method 2
The one or more receiver devices receive the power via the electromagnetic field and convert the received power back to an electric current
Implementation Method 3
The resonant magnetic loop antenna is driven by the RF power source at a resonant frequency of the antenna
Implementation Method 4
wireless power transfer to a plurality of receiver devices through magnetic coupling
Data Source
AI summary
A radio frequency (RF) power source for use with a wireless power transmitter is provided. A direct current (DC) voltage supply of the RF power source supplies a substantially constant DC voltage to RF power source circuitry of the RF power source. A first node of the RF power source circuitry is electrically coupled to a first terminal of the DC voltage supply. The RF power source circuitry has first and second terminals that are electrically coupled to first and second terminals, respectively, of a resonant magnetic loop antenna of the wireless power transmitter circuit to provide an RF current having a constant amplitude to the resonant magnetic loop antenna.