Wireless Power Protocol Switching 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, using in-band and out-of-band communication protocols as needed.
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 requirements. The power transmitter determines the power class of the power receiver and selects appropriate communication protocols (first protocol for power class 0, second protocol for power class 1) to maintain compatibility while adapting to different operational conditions
Solution Approach 2:
The communication protocol parameters are changed based on power class. The system modifies communication parameters such as protocol type, data rates, and modulation schemes according to the power class of the receiver, enabling optimized communication for each power level while maintaining overall system compatibility
2Reliability
If communication protocol selection is based on detailed power class and protocol information exchange, then communication compatibility is improved, but the complexity of the negotiation phase increases
Solution Approach 1:
The system performs preliminary information exchange during the identification/configuration phase where the power receiver sends configuration packets containing power class and supported communication protocol information. This preliminary action prepares the data needed for protocol selection before the negotiation phase begins
Solution Approach 2:
The power transmitter uses feedback from the configuration packets received during the identification phase to determine the appropriate communication protocol. The receiver's indicated preferences and capabilities are fed back into the protocol selection process, enabling automated compatibility matching without complex manual negotiation
3Measurement precision
If foreign object detection sensitivity is increased by adjusting specific parameters, then detection accuracy is improved, but false detection rate increases
Solution Approach 1:
The system adjusts specific parameters during the calibration phase to optimize foreign object detection. By controlling parameters such as measurement thresholds, integration times, and sensitivity levels, the system achieves accurate foreign object detection while minimizing false positives through parameter optimization
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 system compatibility and reducing foreign object detection errors.
Implementation Method 1
In the electromagnetic induction method, 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 so that power is transferred
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.