Wireless Power Transfer Packet Negotiation for Stable High-Speed Data
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in maintaining compatibility between wireless power transmitters and receivers of different power classes, leading to unstable or potentially damaging power transfer due to overvoltage issues, and lack effective methods for high-speed data transmission during power transfer.
Innovation Solution
A method and apparatus are developed to enable wireless power transmitters to receive request information from receivers, negotiate optimal packet lengths, and transmit data based on a control error (CE) packet interval, supporting efficient data transport stream (TPL) negotiation between transmitters and receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wireless power transfer uses magnetic coupling methods, then power can be transmitted wirelessly, but data transmission speed is limited during power transfer
Solution Approach 1:
The data transmission channel is segmented from the power transfer channel. Data is transmitted through separate communication interfaces (such as USB, Bluetooth, or Wi-Fi) independent of the magnetic coupling power transfer path, allowing high-speed data transmission without interfering with power transfer stability
Solution Approach 2:
A communication control unit acts as an intermediary, managing both power transfer control signals and data transmission separately. This mediator coordinates the negotiation phase where data packets are exchanged to establish communication parameters before power transfer begins, ensuring both functions operate reliably
2Adaptability or versatility
If wireless power transmitter and receiver use different power classes, then system versatility is improved, but compatibility and power transfer stability deteriorate due to overvoltage issues
Solution Approach 1:
The system dynamically adjusts power transfer parameters based on the receiver's power class capabilities. During the negotiation phase, the transmitter and receiver exchange capability information, and the transmitter adapts its output voltage and current levels in real-time to match the receiver's requirements, preventing overvoltage while supporting multiple power classes
Solution Approach 2:
The system changes operational parameters (voltage, current, frequency) during the negotiation phase based on exchanged capability data. The transmitter modifies its output characteristics according to the receiver's power class, ensuring compatible and stable power transfer across different device types
3Productivity
If data transmission uses fixed packet intervals, then system complexity is reduced, but data transmission efficiency and speed are limited
Solution Approach 1:
The packet interval is made dynamic rather than fixed. During the negotiation phase, the system determines optimal packet intervals based on data priority, buffer status, and power transfer state. High-priority data can be transmitted with shorter intervals while maintaining manageable system complexity through predefined interval ranges
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 and compatible power transfer by optimizing packet lengths, preventing overvoltage, and enables high-speed data transmission, enhancing user experience and infrastructure compatibility.
Implementation Method 1
The magnetic induction method corresponds to a method transmitting power by using electric currents that are induced to the coil of the receiver by a magnetic field, which is generated from a coil battery cell of the transmitter, in accordance with an electromagnetic coupling between a transmitting coil and a receiving coil
Implementation Method 2
The magnetic resonance method is similar to the magnetic induction method in that is uses a magnetic field. However, the magnetic resonance method is different from the magnetic induction method in that energy is transmitted due to a concentration of magnetic fields on both a transmitting end and a receiving end, which is caused by the generated resonance
Data Source
AI summary
The present disclosure provides a wireless power transfer method performed by a wireless power transmitter in a wireless power transmission system, and a device using same, the method comprising: establishing a power transfer contract with a wireless power receiver in a negotiation phase; and transferring the wireless power to the wireless power receiver on the basis of the power transfer contract in a power transfer phase, wherein the wireless power transmitter receives request information from the wireless power receiver in the negotiation phase, the request information includes information on a control error (CE) packet interval, and the wireless power transmitter transmits data to the wireless power receiver on the basis of the CE packet interval in the power transfer phase.