Dual-Mode Wireless Charging Module Rectifier Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual-mode wireless charging systems face reduced power transfer efficiency due to coupling between high-frequency and low-frequency coils, affecting the overall performance during both low-frequency and high-frequency wireless charging operations.
Innovation Solution
A charging module comprising a low-frequency resonant unit, a high-frequency resonant unit, a first capacitor, a rectifier unit, and a voltage conversion unit, where the high-frequency tuning capacitor is optimized to maintain the difference between AC voltage and induced electromotive force within a preset interval, and a switch unit is used to control series resonance and filter spurious signals, enhancing power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If both high-frequency and low-frequency coils are connected to the same rectifier circuit, then cost is reduced by reusing the rectifier circuit, but power transmission efficiency is reduced due to coupling between the coils
Solution Approach 1:
The patent divides the rectification process into two separate paths: one for high-frequency signals and one for low-frequency signals. Each frequency band has its own dedicated rectifier circuit, preventing the coupling losses that occur when both frequencies share a common rectifier. This segmentation allows each rectifier to be optimized for its specific frequency range, maintaining high power transmission efficiency while still achieving cost-effectiveness through selective component reuse.
Solution Approach 2:
The patent introduces a frequency selection circuit as an intermediary component that directs high-frequency and low-frequency signals to their respective dedicated rectifier circuits. This intermediary prevents direct coupling between the two frequency paths while maintaining system organization and controlling complexity through a centralized signal routing mechanism.
2Volume of moving object
If the high-frequency coil and low-frequency coil are closely arranged to save space, then device compactness is improved, but coupling between coils increases reducing power transmission efficiency
Solution Approach 1:
The patent applies different spatial arrangement strategies to different frequency coils based on their specific requirements. The high-frequency coil and low-frequency coil are positioned with optimized spacing and orientation that minimizes mutual coupling while maintaining overall device compactness. Each coil's local positioning is tailored to its resonant frequency characteristics, allowing tight integration without excessive coupling.
Solution Approach 2:
The patent employs shielding structures and ground planes positioned between the high-frequency and low-frequency coils to create equipotential regions that reduce electromagnetic coupling. These intermediate shielding elements maintain the compact form factor while effectively decoupling the two frequency paths through controlled electromagnetic field management.
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 solution improves the efficiency of dual-mode wireless charging by minimizing high-frequency current generation on the low-frequency coil, maximizing power transmission capacity, and maintaining high-frequency power transmission efficiency while maintaining low-frequency operation integrity.
Implementation Method 1
The first capacitor is used to make the high-frequency coil and the high-frequency tuning capacitor form a series resonance near an operating frequency of high-frequency wireless power signal
Implementation Method 2
The high-frequency tuning capacitor is used to make a difference between an AC voltage between two terminals of the high-frequency resonant unit when receiving high-frequency wireless power signals and an induced electromotive force between two terminals of the low-frequency coil generated by a current flowing through the high-frequency resonant unit
Data Source
AI summary
A charging module includes a low-frequency resonant unit, a high-frequency resonant unit, a first capacitor, a rectifier unit and a voltage conversion unit. The low-frequency resonant unit comprises a low-frequency coil and a low-frequency compensation capacitor connected in series. The high-frequency resonant unit comprises a high-frequency coil and a high-frequency tuning capacitor connected in series. The high-frequency tuning capacitor is used to make the difference between the AC voltage between two terminals of the high-frequency resonant unit when receiving high-frequency wireless power signals and the induced electromotive force between two terminals of the low-frequency coil generated by the current flowing through the high-frequency resonant unit is within a preset interval.