Wireless Power Receiver Authentication with Selective Out-of-Band Links
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Solution Overview
Problem
Existing wireless power transmission systems require significant time for device authentication due to the need to switch from in-band communication to out-of-band communication when the out-of-band function is disabled, leading to inefficiencies in the authentication process.
Innovation Solution
A power receiving apparatus and a power transmitting apparatus are designed with dual communication units, allowing for the determination of the out-of-band communication capability and enabling its use for device authentication if available, or switching to in-band communication if not, thereby reducing authentication time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If out-of-band communication is used for device authentication, then authentication speed is improved, but the system complexity increases due to requiring dual communication units
Solution Approach 1:
The power receiving apparatus is equipped with dual communication units (first communication unit for in-band communication and second communication unit for out-of-band communication), enabling the system to perform device authentication through multiple communication pathways. This multi-functionality allows the apparatus to select the appropriate communication method based on the authentication target, thereby achieving high-speed authentication when possible while maintaining compatibility with systems that only support in-band communication.
2Adaptability or versatility
If in-band communication is used for device authentication, then device compatibility is improved, but authentication time increases
Solution Approach 1:
The system dynamically selects the communication method for device authentication based on the capabilities of the authentication target. When the target supports out-of-band communication, the second communication unit is used for high-speed authentication. When the target only supports in-band communication, the first communication unit is used to ensure compatibility. This dynamic adaptation resolves the contradiction between speed and compatibility.
3Use of energy by moving object
If out-of-band communication function is disabled in power receiving apparatus, then power consumption is reduced, but authentication efficiency deteriorates when out-of-band communication is available
Solution Approach 1:
The power receiving apparatus determines in advance whether the authentication target supports out-of-band communication before initiating the authentication process. By checking the communication capabilities beforehand, the system can proactively enable the second communication unit only when needed, avoiding unnecessary power consumption while ensuring high-speed authentication is performed when the capability exists.
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 significantly reduces the time required for device authentication by enabling faster communication methods when out-of-band communication is available, while ensuring seamless operation even when out-of-band communication is disabled.
Implementation Method 1
power transmitting apparatus for performing wireless power transmission, comprising: a first communication unit configured to communicate with the power receiving apparatus
Implementation Method 2
The power transmitting apparatus and the power receiving apparatus of Japanese Patent Laid-Open No. 2016-007116 exchange control information necessary for control of power transmission by so-called in-band communication superimposed on power to be transmitted/received
Implementation Method 3
Japanese Patent Laid-Open No. 2012-217224 proposes a technique of exchanging control signals to be transmitted/received between a power transmitting apparatus and a power receiving apparatus by communication (so-called out-of-band communication) via a frequency and coils (or antennas) different from those in wireless power transmission
Data Source
AI summary
A power receiving apparatus for receiving power transmitted by wireless power transmission from a power transmitting apparatus, comprises a first communication unit for communicating with the power transmitting apparatus, and a second communication unit for performing communication at a speed higher than the first communication unit. The power receiving apparatus determines, by communication via the first communication unit, whether the power transmitting apparatus has a function of transmitting/receiving, via the second communication unit, information for device authentication with the power transmitting apparatus, and enables the second communication unit to execute transmission/reception of the information for the device authentication with the power transmitting apparatus via the second communication unit if it is determined that the power transmitting apparatus has the function and the second communication unit is in a disabled state.