Double-Sided LCC Compensation Tuning for Weak-Coupling Wireless Charging
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Solution Overview
Problem
Existing wireless charging systems with double-sided LCC compensation networks face challenges in maintaining efficient power transfer due to unavoidable parking deviations, which lead to decreased coupling coefficients and power transmission efficiency.
Innovation Solution
A method and system for adjusting the double-sided LCC compensation network by determining the most critical compensation element based on sensitivity analysis, and adjusting its parameter value in real-time to maintain optimal power transfer, even in weak coupling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all compensation elements (two inductors and four capacitors) are designed as adjustable components to maintain power transfer efficiency under parking deviation, then power transfer efficiency is improved, but device complexity and system volume increase significantly
Solution Approach 1:
The patent extracts and identifies the most critical compensation element (typically one capacitor or inductor) that has the greatest influence on power transfer efficiency under parking deviation. Instead of making all six compensation elements adjustable, only the most sensitive one is made adjustable while others remain fixed, thereby maintaining efficiency improvement while dramatically reducing system complexity and cost
Solution Approach 2:
The patent changes the parameter (adjustability) of compensation elements from all elements being adjustable to only the most critical element being adjustable. This selective parameter change approach maintains the ability to compensate for parking deviation while reducing the number of adjustable components from six to one, resolving the contradiction between efficiency and complexity
2Adaptability or versatility
If multiple adjustable compensation elements are used to compensate for coupling coefficient changes, then adaptability to parking deviation is improved, but installation space requirements increase
Solution Approach 1:
The patent extracts only the most critical compensation element that provides the majority of adaptability benefit under parking deviation conditions. By selecting and adjusting only one key element rather than all six compensation elements, the system maintains high adaptability to parking deviation while significantly reducing the space required for installation and the number of components that need to be physically accommodated
3Power
If all compensation elements are made adjustable to maintain rated power output under weak coupling, then power transmission capability is improved, but system cost increases
Solution Approach 1:
The patent identifies and extracts the single most critical compensation element whose adjustment has the greatest impact on maintaining rated power output under weak coupling conditions. By making only this one element adjustable rather than all six elements, the system achieves the power transmission capability improvement while avoiding the prohibitive cost increase that would result from making all compensation elements adjustable
Solution Approach 2:
The patent applies parameter changes selectively to only the most critical compensation element, changing its value in response to coupling coefficient variations to maintain rated power output. This selective parameter adjustment approach achieves the desired power transmission capability while minimizing the cost increase associated with adjustable components
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 proposed solution reduces control complexity, allows for rated power output in weak coupling conditions, and enhances the anti-offset capability of the wireless charging system, while minimizing additional circuitry and costs.
Implementation Method 1
Power transfer is based on the Faraday electromagnetic induction principle, where an alternating current is input into a primary-side coil of the coupler to generate an alternating magnetic field, and electrical energy is induced in a secondary-side coil
Implementation Method 2
a double-sided LCC compensation network has attracted attention because stability thereof is relatively good, a resonance frequency is not affected by a coupling coefficient and a load change
Data Source
AI summary
A method and a system for adjusting a double-sided LCC compensation network of a wireless charging system are provided. The method includes: obtaining a standard coupling coefficient, a rated operating frequency, and rated parameter values of compensation elements in the wireless charging system; determining change rates of output performance of the wireless charging system; determining an adjustable compensation element; obtaining a real-time coupling coefficient between the primary-side transmitting coil and the secondary-side receiving coil; determining whether the real-time coupling coefficient is less than a coupling coefficient threshold; and adjusting an operating frequency of the wireless charging system when the real-time coupling coefficient is not less than the coupling coefficient threshold; or adjusting both an operating frequency of the wireless charging system and the adjustable compensation element when the real-time coupling coefficient is less than the coupling coefficient threshold.