Wireless Power Transmitter Setpoint Control Without Digital Feedback
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Solution Overview
Problem
Existing wireless energy transfer systems face inefficiencies due to the need for digital communication to adjust power transmission, leading to increased complexity and heat dissipation in receivers.
Innovation Solution
A circuit is proposed that includes a comparator circuit to compare instantaneous and average peak voltages of a transmit coil, and a transistor to adjust the setpoint of the wireless power transmitter, allowing for efficient power adjustment without digital communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If digital communication is used to close the loop between receiver and transmitter, then power transmission efficiency is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts the communication function from the system by eliminating the need for digital communication between transmitter and receiver. Instead of using communication protocols to convey power adjustment information, the system directly senses power transfer status through electrical parameters (voltage, current, impedance) and automatically adjusts power transmission, thereby removing the communication subsystem and reducing device complexity while maintaining efficient power transfer
Solution Approach 2:
The wireless power transmission system performs self-adjustment by automatically sensing its own operational state through electrical parameter monitoring. The system uses built-in sensors to detect power transfer conditions and autonomously modifies transmission parameters without external communication commands, enabling the system to serve itself and eliminate the need for complex communication infrastructure
2Loss of energy
If digital communication is used to adjust power transmission, then power transmission efficiency is improved, but receiver size increases
Solution Approach 1:
The patent removes the communication module from the receiver design. By using direct electrical parameter sensing and analog feedback mechanisms, the receiver no longer requires digital communication transceivers, processors, and associated software, significantly reducing the receiver's volume and making it more suitable for compact applications
Solution Approach 2:
The receiver autonomously monitors its own power reception status through electrical parameter sensing and directly communicates power adjustment needs to the transmitter through simple electrical feedback signals. This self-service capability eliminates the need for complex communication hardware in the receiver, reducing its size while maintaining efficient power transfer
3Device complexity
If fixed power transmission is used, then system simplicity is maintained, but energy is wasted as heat in the receiver
Solution Approach 1:
The patent transforms the fixed power transmission system into a dynamic one by continuously monitoring electrical parameters (voltage, current, impedance) and automatically adjusting transmission power based on real-time load conditions. This dynamic adaptation ensures power is transmitted only when needed and at the optimal level, preventing energy waste as heat while maintaining relatively simple system architecture through direct electrical feedback control
Solution Approach 2:
The system implements a feedback mechanism where electrical parameters from the receiver side are sensed and used to automatically adjust transmitter output power. This closed-loop control, achieved through direct electrical sensing without complex communication, enables the system to adapt to load changes and prevent energy waste while maintaining simplicity
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 solution enhances the efficiency of wireless energy transfer by dynamically adjusting power transmission based on load demands, reducing thermal build-up and system complexity.
Implementation Method 1
a comparator circuit configured to receive a first representation of an instantaneous peak voltage of a transmit coil of a wireless power transmitter, to receive a second representation of an average peak voltage of the transmit coil and to provide an output representing a result of a comparison of the first representation with the second representation
Implementation Method 2
a transistor configured to adjust a setpoint of the wireless power transmitter in response to an output of the comparator
Implementation Method 3
wireless energy transfer techniques such as for wireless charging
Data Source
AI summary
Techniques for improving efficiency of wireless power transfer to shunt-based receiver are provided. In an example, techniques can optimize wireless power transfer by comparing instantaneous peak voltage of a transmit coil of a wireless power transmitter to an average peak voltage of the transmit coil, and then, based on the comparison, adjust a setpoint of the wireless power transmitter to a more efficient level.