Resonant Contactless Power Transfer With Fixed-Frequency Load Control
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Solution Overview
Problem
Resonance-based contactless power transfer systems face inefficiencies due to variations in system frequency caused by changing load power requirements during charging cycles, leading to undesirable effects on power transmission efficiency.
Innovation Solution
A contactless power transfer system that includes a first power converter to convert direct current power to alternating current power at a system frequency, a power exchanger coil to transmit this power via a magnetic field, and a controller to adjust the operating state of the power converter by altering the activated and deactivated time periods to match varying load power needs, ensuring efficient power transfer at a fixed system frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system frequency is varied to match changing load power requirements during charging cycles, then the power rating adapts to load needs, but the power transmission efficiency deteriorates due to frequency variations
Solution Approach 1:
The patent applies dynamics by making the power rating adjustable and controllable during operation. The system dynamically adjusts the power rating of the resonance-based contactless power transfer system to match changing load power requirements during charging cycles, while maintaining a fixed system frequency to preserve transmission efficiency.
Solution Approach 2:
The patent changes the power rating parameter independently from the system frequency parameter. By separating these two parameters, the system can adjust power rating to match load needs while keeping frequency constant at its optimal value, thus resolving the contradiction between adaptability and efficiency.
2Loss of energy
If the system operates at a fixed frequency, then the power transmission efficiency is maintained, but the power rating cannot adapt to changing load power requirements
Solution Approach 1:
The patent segments the control parameters into two independent parts: system frequency (kept fixed for efficiency) and power rating (adjusted for adaptability). This segmentation allows each parameter to be optimized for its specific function without compromising the other.
Solution Approach 2:
The system implements dynamic control of the power rating while maintaining a fixed frequency. The controller continuously monitors load power requirements and adjusts the power rating accordingly, enabling adaptation without frequency variations that would reduce efficiency.
3Device complexity
If inductive coupling is used for power transfer, then the system structure is simple, but the power can only be transmitted between closely coupled coils and efficiency is poor
Solution Approach 1:
The patent employs resonance-based coupling which utilizes oscillating magnetic fields at resonant frequencies to transfer power over longer distances. This approach improves transmission efficiency compared to inductive coupling by leveraging resonant enhancement of the magnetic field coupling between transmitter and receiver coils.
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
This solution stabilizes power transfer efficiency by dynamically adjusting the power converter's operating state based on sensed load power, maintaining efficient power transmission despite fluctuations in load power requirements, thereby improving overall system performance.
Implementation Method 1
transferring the alternating current power from the first power exchanger coil to the second power exchanger coil at the system frequency via a magnetic field
Data Source
AI summary
A contactless power transfer system is provided. The contactless power transfer system includes a first power exchanger coil configured to exchange power. The contactless power transfer system also includes a first power converter operatively coupled to the first power exchanger coil and configured to convert a direct current power to an alternating current power at a system frequency. The contactless power transfer system further includes a controller configured to control an operating state of the first power converter to vary an alternating current power provided to the first power exchanger coil at the system frequency.