Wireless Power Authentication Sequence for Safe High-Power Charging
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in ensuring secure and efficient power transfer between wireless power transmitters and receivers, particularly in maintaining compatibility and preventing damage due to overvoltage when different power classes are involved.
Innovation Solution
A method involving a ping phase, configuration phase, low power transfer phase, authentication phase, and high power transfer phase is implemented, where a digital ping is transmitted and responded to, and a configuration packet is exchanged to determine authentication support, enabling secure and efficient power transfer based on successful authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transmission is performed without authentication, then power transfer speed and efficiency are improved, but device compatibility and safety deteriorate due to overvoltage damage
Solution Approach 1:
The patent applies preliminary action by performing authentication and capability exchange before the actual power transfer. The transmitter and receiver exchange capability packets during a configuration phase before entering the power transfer phase, allowing them to pre-negotiate power class compatibility and authentication credentials, thus preventing overvoltage damage while enabling efficient power transfer.
Solution Approach 2:
The patent segments the wireless power transmission process into distinct phases: configuration phase for capability exchange and authentication, and power transfer phase for actual power delivery. This segmentation allows authentication to occur separately before power transfer, resolving the contradiction between safety checks and transfer efficiency.
2Reliability
If authentication phase is added to wireless power transmission, then device compatibility and safety are improved, but transmission time and process complexity worsen
Solution Approach 1:
The patent merges the authentication process with the capability exchange process into a single configuration phase. Both the capability packet exchange and authentication credentials verification occur together before power transfer, reducing the total time loss compared to separate authentication and configuration phases.
3Power
If high power transfer is performed without authentication, then power delivery speed is improved, but risk of overvoltage damage increases
Solution Approach 1:
The patent applies preliminary action by verifying device compatibility and authentication credentials before initiating high power transfer. The capability packet exchange during configuration phase allows the transmitter to determine the receiver's power class and voltage tolerance in advance, enabling safe high power delivery without overvoltage damage.
Data Source
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AI summary
A method by which a wireless power transmitter transmits wireless power, according to one embodiment of the present specification, comprises: a ping step of transmitting a digital ping, and receiving a response to the digital ping from a wireless power receiver; a configuration step of receiving, from the wireless power receiver, a configuration packet including information about whether the wireless power receiver supports an authentication function; and a power transmission step of transmitting wireless power to the wireless power receiver, wherein the power transmission step includes a low-power transmission step of transmitting low wireless power, an authentication step of authenticating the wireless power transmitter on the basis the supporting of the authentication function by the wireless power receiver, and a high-power transmission step of transmitting high wireless power on the basis of the successful authentication of the wireless power transmitter in the authentication step.