Wireless Power Transmitter Multilayer PCB Feedback Loop
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Solution Overview
Problem
Current wireless power transfer technologies face inefficiencies and noise issues, limiting their commercialization potential, particularly in achieving high efficiency comparable to wired systems and ensuring reliable wireless communication during charging.
Innovation Solution
A system with a transmitter featuring a feedback loop for efficient switching of a MOSFET or other electronic switch, utilizing a push-pull coupled transmitter planar coil pair and a planar receiving coil embedded in a thin PCB/FPC, which enables high-efficiency coupling and shields electronics from noise, along with a bi-directional data channel for real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transfer is implemented, then convenience and contactless charging are improved, but energy transfer efficiency deteriorates compared to wired systems
Solution Approach 1:
The patent implements dynamic frequency tuning and duty cycle adjustment based on real-time coupling conditions. The transmitter monitors the resonant frequency and load conditions, then dynamically adjusts the operating parameters to maintain optimal efficiency across varying distances and load requirements, resolving the efficiency degradation problem in wireless power transfer
Solution Approach 2:
The system changes physical parameters including switching frequency, duty cycle, and resonant frequency to optimize power transfer efficiency. By adjusting these parameters in response to coupling conditions, the system maintains高效率 operation across different operating scenarios, directly addressing the efficiency deterioration issue
2Power
If high energy levels are used for wireless power transfer, then power transfer capability is improved, but noise generation deteriorates and interferes with electronic communication
Solution Approach 1:
The patent employs feedback mechanisms that monitor noise levels and power transfer conditions in real-time. The system adjusts the power level and switching parameters based on feedback signals, reducing noise generation when communication is detected and optimizing power transfer when communication is not active, thereby resolving the noise interference problem
Solution Approach 2:
The system uses periodic switching at optimized frequencies that minimize electromagnetic interference with communication bands. By carefully selecting and adjusting the switching frequency to avoid communication frequency ranges, the system reduces noise generation while maintaining effective power transfer capability
3Ease of operation
If wireless power transfer is implemented, then convenience is improved, but reliability deteriorates due to varying coupling conditions and communication interference
Solution Approach 1:
The system dynamically adjusts power transfer parameters and frequency based on real-time coupling conditions and communication status. When communication is detected, the system modifies operating parameters to ensure reliable communication while maintaining adequate power transfer, resolving the reliability deterioration issue
Solution Approach 2:
Bidirectional communication channels provide feedback on coupling conditions and communication quality. The system uses this feedback to adjust power transfer parameters, ensuring both reliable communication and effective power transfer under varying conditions, directly addressing the reliability problem
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 solution achieves efficient wireless power transfer with improved noise insulation, maintaining electronic functionality during charging and meeting efficiency standards, thus advancing the commercial viability of wireless charging systems.
Implementation Method 1
The present invention relates to systems and methods for transferring power wirelessly from a sending device to a receiving device
Implementation Method 2
sensing instantaneous voltage on the transmitter coil sensing on the transmitter side (this voltage varies with the switching on the receiving side because of the magnetic coupling is bi-directional)
Implementation Method 3
Dual (frequency) series LC resonance sensing on the receiver side
Data Source
AI summary
A wireless transmission system having a transmitter and receiver is described. In one embodiment, the transmitter includes an electronically-controlled switch controlled by a first pulse width modulation control circuit, the switch configured to pull current through a first inductor when the switch is closed, the first pulse width modulation control circuit outputting a PWM output signal to control the switch. A first feedback signal obtained from a control input of the switch. A second feedback signal obtained from a terminal of the inductor, wherein a control feedback signal is computed, at least in part, as a difference between the first feedback signal and the second feedback signal is provided to the first pulse width modulation control circuit. In one embodiment, the receiver includes a second pulse with modulation controller, the second pulse width modulation controller controlling the receiver switch to deliver a desired power from the receiving coil to a load.