Wireless Charging Authentication Handshake for Safe Power Transfer
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Solution Overview
Problem
Existing wireless power transfer systems lack a reliable method for authenticating devices, which can lead to safety risks due to the presence of non-authorized or foreign objects during charging.
Innovation Solution
A method and device for performing authentication in a wireless power transfer system, involving a communication unit that receives indication information on authentication function support from a target device and transmits authentication request messages, with authentication confirmed based on response messages including certificates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power transfer is performed without authentication, then power transmission can be conducted freely and quickly, but safety risks arise due to non-authorized or foreign objects during charging
Solution Approach 1:
The patent implements authentication procedures before power transfer begins. The transmitting device and receiving device exchange capability packets and perform mutual authentication to verify device legitimacy. This preliminary verification ensures that only authorized devices can receive power, preventing foreign object detection issues and safety risks before they occur.
Solution Approach 2:
The authentication mechanism uses feedback loops where devices exchange capability packets containing authentication information. The transmitting device sends authentication requests, the receiving device responds with verification data, and the transmitting device confirms authenticity based on the response. This feedback-based verification ensures reliable safety checks while maintaining systematic control over the power transfer process.
2Reliability
If authentication procedures are implemented, then device reliability and safety are improved, but the charging process becomes more complex and time-consuming
Solution Approach 1:
The patent implements a tiered authentication approach where essential verification is performed quickly to enable power transfer, while more comprehensive authentication occurs in the background or on-demand. Capability packets contain critical authentication information that allows rapid verification, ensuring that safety checks do not significantly delay the charging process while still providing adequate verification.
Solution Approach 2:
Authentication data is exchanged and verified before power transfer begins, allowing the system to establish trust relationships in advance. Once authentication is complete, subsequent power transfers can proceed more quickly since the verification framework is already established, reducing the time penalty of authentication for ongoing charging sessions.
3Stability of the object's composition
If mutual authentication is performed between transmitting and receiving devices, then stability during high-power charging is ensured, but the communication protocol complexity increases
Solution Approach 1:
The capability packet structure serves multiple functions: it conveys device identification information, authentication credentials, power requirements, and compatibility data. By designing a multi-functional packet format that handles various authentication and communication needs in a unified structure, the patent reduces the number of separate protocols required while maintaining comprehensive device verification and charging stability.
Data Source
AI summary
A method in a wireless power transfer system can include transmitting, to a wireless power transmitter during a ping phase, a response signal in response to a digital ping initiated by the wireless power transmitter, and transmitting, to the wireless power transmitter during a configuration phase, a configuration packet including first control information related to whether the wireless power receiver supports an authentication function. Also, the method can further include receiving, from the wireless power transmitter during a negotiation phase, a capability packet including second control information and a potential power value of the wireless power transmitter, in which the second control information is related to whether the wireless power transmitter supports the authentication function, and receiving power from the wireless power transmitter.