Wireless Charging Power Loss Accounting for Friendly Metal
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Solution Overview
Problem
The conventional Power Loss Accounting (MPLA) method for inductive wireless charging shows significant deviations in estimating power loss due to friendly metal, leading to degraded performance of Foreign Object Detection (FOD) methods.
Innovation Solution
An improved MPLA method that considers the distance between the wireless power transmitter and receiver, as well as the rectified voltage of the receiver, to accurately estimate power loss due to friendly metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional MPLA method uses a linear model to estimate power loss due to friendly metal, then the estimation process is simple, but the estimation accuracy is poor with significant deviation from reality
Solution Approach 1:
The patent transforms the estimation approach by changing from a simple linear model to a piecewise linear model that divides the power loss range into multiple segments. Each segment has its own linear approximation, allowing the system to capture the non-linear characteristics of power loss while maintaining computational simplicity. This resolves the contradiction by improving accuracy through parameter segmentation without requiring complex non-linear algorithms.
Solution Approach 2:
The patent segments the power loss estimation range into multiple intervals and applies different linear models to each segment. By dividing the overall estimation problem into smaller, manageable pieces, the system achieves better accuracy in each segment while keeping the overall complexity manageable through modular processing.
2Reliability
If the conventional MPLA method estimates power loss using only basic parameters, then the measurement process is simple, but the FOD performance is degraded due to substantial errors
Solution Approach 1:
The patent performs preliminary classification of power loss into different segments before applying estimation models. By pre-dividing the estimation space and preparing appropriate linear models for each segment, the system improves FOD reliability through more accurate power loss characterization while maintaining a systematic and manageable measurement process.
Solution Approach 2:
The patent uses measured power loss values to determine which segment the current operation falls into, then applies the appropriate linear model for that segment. This feedback mechanism ensures that the most accurate model is used for each specific condition, improving overall FOD performance while maintaining a structured approach to measurement.
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
The improved method demonstrates superior Root Mean Squared Error (RMSE) performance and enhances FOD performance in MPP-based wireless power transmitters and receivers.
Implementation Method 1
inductive wireless charging
Implementation Method 2
inductive wireless charging
Data Source
AI summary
Provided is a method for power loss accounting. The method includes the steps of: acquiring information on at least one of the distance between a wireless power transmitter and a wireless power receiver and a rectified voltage of the wireless power receiver; and estimating power loss due to friendly metal with reference to the acquired information.