Multiphase Wireless Power Coil Control for Misalignment Uniformity
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Solution Overview
Problem
Existing wireless power transmission systems face challenges with uneven output due to high coupling coefficients between power supply coils, which complicate control and cause losses, especially when alignment deviations occur between the power supply and pickup.
Innovation Solution
A multiphase power supply apparatus with low coupling coefficients between coils, utilizing a control unit to adjust phase differences between inverters to ensure uniform output across pickup coils, even in misaligned conditions, and employing optimization algorithms like gradient descent for rapid control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high coupling coefficient between power supply coils is used, then power transmission efficiency is improved, but control complexity increases and output uniformity deteriorates when misalignment occurs
Solution Approach 1:
The power supply system is divided into multiple independent power supply coils, each with its own inverter that can be controlled independently. This segmentation allows each coil to operate with optimized coupling coefficients while maintaining overall system efficiency, and enables independent control of each coil's output to compensate for misalignment effects.
Solution Approach 2:
The system dynamically adjusts the phase difference between inverters based on real-time alignment conditions. When misalignment is detected, the control unit modifies the phase relationships dynamically to maintain uniform output across all pickup coils, adapting the control strategy to current operating conditions.
2Loss of energy
If high coupling coefficient between power supply coils is used, then power transmission efficiency is improved, but output uniformity across pickup coils deteriorates when misalignment occurs
Solution Approach 1:
Each power supply coil is designed with specific local characteristics (different coupling coefficients with adjacent coils) to optimize its contribution to the overall power transmission. The first and second power supply coils have different coupling relationships with the pickup coils, allowing each to contribute differently to compensate for misalignment effects and maintain uniform output.
Solution Approach 2:
The control unit monitors the output of each pickup coil and uses this feedback information to adjust the phase difference between inverters. When misalignment causes uneven output distribution, the feedback mechanism triggers phase adjustments to restore uniformity across all pickup coils.
3Manufacturing precision
If phase difference adjustment is implemented to maintain uniform output, then output uniformity is improved, but control complexity increases
Solution Approach 1:
The control system automatically detects misalignment conditions and self-adjusts the phase differences without requiring external intervention or complex manual control. The system monitors its own output uniformity and implements corrective phase adjustments autonomously, simplifying the overall control architecture despite the sophisticated adjustment mechanism.
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
Ensures uniform output across pickup coils by adjusting phase differences and duty ratios, maintaining efficient power transmission despite alignment deviations, thereby improving power density and reducing heat generation.
Implementation Method 1
power supply coils, each coil capable of being supplied with a current having a different phase
Data Source
AI summary
A multiphase power supply apparatus for wireless power transmission and a control method thereof are disclosed. The multiphase power supply apparatus includes two power supply coils and coupling coefficient between the power supply coils is below a predetermined value. When it is determined that a deviation in alignment with the corresponding pickup has occurred, the phase difference between the inverters is adjusted. When adjusted to the optimum phase difference, the output of the pickup coils becomes uniform, even if there is a deviation in the alignment between the power supply apparatus and the pickup.