Wireless Charging Coupling Estimation Error Correction
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in accurately estimating the coupling coefficient (k) between the transmitter and receiver, leading to errors that can hinder efficient power transfer.
Innovation Solution
A method is introduced to handle k-estimation errors through a digital ping phase, where the wireless power transmitter and receiver cooperate in either a full mode or restricted mode to correct errors, involving error detection, communication of error information, and corrective actions such as resetting the power link, initiating a new ping phase, and exchanging ecosystem scaling coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If k-estimation is performed during digital ping phase, then wireless power transfer negotiation can proceed, but errors may occur that hinder efficient power transfer
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects k-estimation errors and communicates them back to the transmitter through specific packet fields (restricted field set to 1, error code fields). This feedback loop enables the transmitter to identify estimation errors and initiate appropriate correction procedures, resolving the contradiction between maintaining negotiation efficiency and ensuring estimation accuracy.
Solution Approach 2:
The patent changes operational parameters by implementing different error correction modes (full mode with cooperative correction and restricted mode with autonomous correction) based on receiver availability. This parameter change allows the system to adapt to different error conditions while maintaining overall system productivity and reliability.
2Reliability
If full mode error correction procedure is performed with receiver cooperation, then k-estimation error can be corrected accurately, but system complexity increases
Solution Approach 1:
The patent segments the error correction process into two distinct modes: full mode for cooperative correction when receiver is available, and restricted mode for autonomous correction when receiver is unavailable. This segmentation allows the system to achieve high correction accuracy when possible while maintaining simpler operation when the receiver cannot cooperate, thus managing system complexity effectively.
Solution Approach 2:
The patent implements dynamic error correction procedures that adapt based on receiver availability. The system transitions between full mode and restricted mode depending on whether the receiver can assist, making the correction process flexible and context-dependent rather than fixed and overly complex.
3Ease of operation
If restricted mode error correction is performed without receiver cooperation, then correction can proceed autonomously, but correction accuracy may be reduced
Solution Approach 1:
The patent prepares for autonomous correction by implementing predefined correction procedures that the transmitter can execute without receiver cooperation. These preliminary actions include resetting the power link, re-attempting k-estimation, and using error code information from the receiver's initial response to guide correction, ensuring that autonomous correction can proceed with reasonable accuracy.
4Measurement precision
If error correction procedures are implemented, then k-estimation accuracy improves, but negotiation time increases
Solution Approach 1:
The patent implements efficient error correction by skipping unnecessary steps. When errors are detected, the system directly initiates targeted correction procedures rather than repeating the entire negotiation process. The use of error codes and restricted/full mode selection allows the system to rush through correction efficiently, minimizing time loss while improving accuracy.
Data Source
AI summary
Handling k-estimation errors in a wireless power transfer system can include performing k-estimation during a digital ping phase of a wireless power transfer negotiation; determining that an error occurred while performing k-estimation; determining whether the wireless power receiver is available to assist in correcting the error; responsive to determining that an error occurred while performing k-estimation and the wireless power receiver being available to assist in correcting the error, performing a full mode error correction procedure in which the wireless power transmitter cooperates with the wireless power receiver to correct the error that occurred during k-estimation; and responsive to determining that an error occurred while performing k-estimation and the wireless power receiver being unavailable to assist in correcting the error, performing a restricted mode error correction procedure in which the wireless power transmitter attempts to correct the error that occurred during the k-estimation without cooperation from the wireless power receiver.