Multi-Coil Wireless Charging with Shared-Mode Power Control
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Solution Overview
Problem
Existing wireless power transmission systems, particularly those adhering to the WPC standard, lack the ability for the power transmitter to dynamically adjust power levels in response to changing environments or detect foreign objects, leading to inefficiencies and potential safety risks.
Innovation Solution
A wireless power transmission method where the power transmitter actively monitors the environment, communicates with the receiver to establish a power transfer contract, and adjusts power levels based on real-time conditions, including detecting foreign objects, using a modified communication protocol that allows for flexible power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power receiver initiates communication in the WPC standard protocol, then the communication protocol is simple and standardized, but the power transmitter cannot detect foreign objects or adjust power levels initiatively
Solution Approach 1:
The patent inverts the traditional communication roles by enabling the power transmitter to initiate communication and send requests to the power receiver. This allows the transmitter to actively detect foreign objects and adjust power levels, reversing the conventional receiver-initiated protocol while maintaining compatibility through selective role assignment.
Solution Approach 2:
The system dynamically switches communication roles between transmitter and receiver based on operational needs. The transmitter can initiate communication when foreign object detection or power adjustment is required, while the receiver initiates during normal charging operations, creating a flexible, context-dependent communication protocol.
2Productivity
If the power transmitter transmits only responses to receiver requests, then the protocol implementation is simple, but the transmitter cannot detect foreign objects or adjust power at desired timing
Solution Approach 1:
The power transmitter performs preliminary actions by initiating communication and sending requests to detect foreign objects or adjust power levels before the receiver would normally initiate contact. This allows the transmitter to proactively manage charging parameters and respond to environmental changes at optimal timing.
Solution Approach 2:
The system implements feedback mechanisms where the transmitter sends requests and receives responses from the receiver, creating a closed-loop control system. This enables the transmitter to adjust power levels based on real-time charging status, foreign object detection, and environmental conditions while maintaining protocol simplicity through structured request-response exchanges.
3Reliability
If the power transmitter monitors environment and adjusts power dynamically, then system safety and efficiency improve, but the communication protocol becomes more complex
Solution Approach 1:
The communication protocol is designed to be universal and multi-functional, supporting both traditional receiver-initiated communication and the new transmitter-initiated communication for foreign object detection and power adjustment. This single protocol handles multiple functions (normal charging, FOD detection, power optimization) without requiring separate specialized protocols, reducing overall system complexity.
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
Enables dynamic power level adjustments and effective detection of foreign objects, enhancing system efficiency and safety by preventing overheating or damage.
Implementation Method 1
In the electromagnetic induction method, a power transmission unit generates a magnetic field through a power transmission coil (i.e., a primary coil), and a power reception coil (i.e., a secondary coil) is placed at the location where an electric current may be induced so that power is transferred.
Implementation Method 2
In the resonant method, energy is transmitted using a resonant phenomenon between the transmission coil and the reception coil. In this case, a system is configured so that the primary coil and the secondary coil have the same resonant frequency, and resonant mode energy coupling between the transmission and reception coils is used.
Data Source
AI summary
A wireless power transmission method executed by a power transmitter comprising multi-coils, according to one embodiment of the present invention, comprises the steps of: detecting a second power receiver while transmitting power to a first power receiver; determining at least one primary coil adequate for power transmission; by using the determined at least one primary coil, determining whether the second power receiver supports a shared mode protocol; and if the second power receiver supports the shared mode protocol, transmitting power to the first and second power receivers according to the shared mode protocol, wherein the shared mode protocol may be a protocol for simultaneously managing information exchanges between the power transmitter and multiple power receivers.