Wireless Power Protocol Selection for Cross-Class Compatibility
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in maintaining stable communication compatibility between power transmitters and receivers with different power classes, leading to inefficiencies and compatibility issues.
Innovation Solution
A method is introduced that includes a selection phase for monitoring object placement, a ping phase for digital communication, an identification/configuration phase for receiving configuration information, a negotiation phase for selecting appropriate communication protocols based on power class and protocol information, and a power transfer phase for stable communication and power transfer, utilizing in-band and out-of-band communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single communication protocol is used for all power classes, then device complexity is reduced, but communication compatibility between power transmitters and receivers with different power classes deteriorates
Solution Approach 1:
The system dynamically selects communication protocols based on power class information. During the negotiation phase, the power transmitter determines the power class of the power receiver and adaptively chooses between first communication protocol (for power class 0) or second communication protocol (for power class 1), enabling the system to adjust its behavior based on operational conditions rather than using a fixed protocol
Solution Approach 2:
The system changes communication parameters (protocol selection) based on power class parameters. By extracting power class information from configuration packets and using it to determine appropriate communication protocols, the system modifies its operational parameters to match the specific power class requirements, ensuring compatibility across different device types
2Reliability
If communication protocol is selected based on power class information, then communication compatibility is improved, but device complexity increases due to multiple protocols and selection logic
Solution Approach 1:
The system performs preliminary actions by determining power class information during the identification/configuration phase before proceeding to the negotiation phase. Configuration packets containing power class information are received and processed in advance, allowing the system to prepare appropriate communication protocols before they are actually needed for power transfer
Solution Approach 2:
The communication system is segmented into distinct protocols for different power classes. The first communication protocol is dedicated to power class 0 devices while the second communication protocol serves power class 1 devices, creating clearly defined segments that reduce cross-interference and simplify the selection logic compared to a single universal protocol
3Measurement precision
If foreign object detection sensitivity is improved by controlling specific parameters, then safety is enhanced, but power transfer efficiency may deteriorate due to increased detection overhead
Solution Approach 1:
The system implements periodic foreign object detection during the calibration phase by controlling specific parameters at regular intervals. Rather than continuous monitoring that would reduce power transfer efficiency, the system performs detection at structured intervals using calibrated parameters, maintaining safety while minimizing impact on overall power transfer productivity
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 ensures stable communication compatibility and efficient power transfer by selecting the appropriate communication protocol based on power class and protocol information, enhancing the ability to detect foreign objects and maintaining power transfer compatibility.
Implementation Method 1
a power transmission unit generates a magnetic field through a power transmission coil (i.e., a primary coil), and a power reception coil (i.e., a secondary coil) is placed at the location where an electric current may be induced
Implementation Method 2
In the resonant method, energy is transmitted using a resonant phenomenon between the transmission coil and the reception coil. In this case, a system is configured so that the primary coil and the secondary coil have the same resonant frequency, and resonant mode energy coupling between the transmission and reception coils is used
Data Source
AI summary
A method for transferring, by a wireless power transmitter, wireless power, the method including performing digital ping in a ping phase; receiving a configuration packet of a wireless power receiver in a configuration phase after the ping phase; performing a negotiation of a power transfer contract in a negotiation phase after the configuration phase; and transferring the wireless power to the power receiver based on the power transfer contract in a power transfer phase after the negotiation phase, wherein the configuration packet includes a negotiation field, wherein the negotiation field related to whether the negotiation phase is supported is composed of 1 bit, wherein the configuration packet includes a out-of-band field, wherein the out-of-band field is composed of 1 bit, and wherein, based on the out-of-band field having a value of 1, the out-of-band field indicates that the wireless power receiver supports out-of-band communication, and based on the out-of-band field having a value of 0, the out-of-band field indicates that the wireless power receiver does not support the out-of-band communication.