Wireless Power Charging Communication for Multi-Receiver Compatibility
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Solution Overview
Problem
Current communication methods in wireless power transmission systems, particularly in one-to-many charging scenarios, face inefficiencies when multiple devices with different communication capabilities try to charge simultaneously, leading to incompatibility issues and reduced charging efficiency due to the need for in-band communication.
Innovation Solution
The method involves transmitting a broadcast signal by the power transmitter (PTX) to indicate its communication mode and load state, allowing power receivers (PRX) to report their communication states and adjust communication modes to maintain efficient charging, including switching between in-band and out-of-band communication as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If in-band communication is used for handshake between PTX and PRX, then communication compatibility is improved, but charging efficiency deteriorates when multiple devices are present
Solution Approach 1:
The PTX performs out-of-band communication with the first PRX before charging to pre-establish communication compatibility and determine supported communication modes. This preliminary action allows the system to configure communication parameters in advance, avoiding the need for in-band handshake during charging and thus preventing charging efficiency degradation.
Solution Approach 2:
The patent introduces out-of-band communication as an intermediary channel that carries communication mode information and enables handshake between PTX and PRX without using the power transmission band. This intermediary communication path resolves the conflict by separating communication functions from power transmission, allowing both compatibility and efficiency to be maintained.
2Speed
If out-of-band communication (NFC or BLE) is introduced to improve communication rate, then communication speed is improved, but device compatibility deteriorates due to inability to support both NFC and BLE simultaneously
Solution Approach 1:
The system dynamically selects communication modes based on device capabilities and scenarios. The PTX can switch between in-band, NFC, and BLE communication modes depending on which PRX devices are present and their supported protocols. This dynamic adaptability allows the system to achieve high-speed communication when possible while maintaining compatibility across diverse device types.
Solution Approach 2:
The PTX is designed with multi-functionality to support multiple communication protocols (in-band, NFC, BLE) simultaneously. By incorporating universal communication capabilities, the PTX can interact with any PRX device regardless of which specific protocol the PRX supports, thus achieving both high speed and broad compatibility.
3Adaptability or versatility
If in-band communication is performed between PTX and later-entering PRX2, then communication capability is improved, but system charging efficiency deteriorates
Solution Approach 1:
The patent extracts the communication function from the power transmission band and implements it through separate out-of-band channels. When PRX2 enters the system, it establishes communication with the PTX through out-of-band channels rather than in-band communication. This extraction allows communication to occur without occupying the power transmission channel, thus maintaining system charging efficiency while enabling communication capability.
Data Source
AI summary
The present disclosure provides communication methods and apparatuses, a power transmitting device, a power receiving device, and computer readable storage mediums. The communication method includes: transmitting a broadcast signal when detecting a load change of the PTX, where the broadcast signal carries a communication mode supported by the PTX and a current load state; charging a first PRX after a handshake communication with the first PRX; receiving a communication state reported by the first PRX according to the broadcast signal; and communicating with the first PRX according to the communication state. In examples of the present disclosure, by transmitting a broadcast signal after detecting a load change, receiving a communication state reported by the first PRX according to the broadcast signal, and communicating with the first PRX according to the communication state, the PTX may communicate with the PRX without affecting the charging efficiency.