Resonant Contactless Power Transfer With Dynamic Converter Control
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Solution Overview
Problem
Resonance-based contactless power transfer systems face inefficiencies due to variations in system frequency caused by changes in load power during charging cycles, which affect 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 first power exchanger coil to transmit this power via a magnetic field, and a controller to adjust the operating state of the power converter based on sensed voltage or current to maintain efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system frequency is varied during a charging cycle to match varying load power requirements, then the power rating adapts to the load, but the power transmission efficiency deteriorates due to frequency variations affecting resonant coil operation
Solution Approach 1:
The patent applies dynamics by making the power rating dynamic rather than fixed. The controller dynamically adjusts the power rating of the resonance-based contactless power transfer system during the charging cycle based on the actual power required by the load, allowing the system to adapt to varying load conditions while maintaining optimal power transmission efficiency through coordinated control of multiple power converters.
Solution Approach 2:
The patent changes the parameter of power rating from a fixed value to a dynamically adjustable parameter. By modifying the power rating parameter in real-time based on load requirements and by coordinating the operation of multiple power converters, the system achieves both adaptability to varying load power and maintenance of power transmission efficiency.
2Loss of energy
If multiple power converters are coordinated to dynamically adjust power rating, then power transmission efficiency is maintained, but the device complexity increases
Solution Approach 1:
The patent merges multiple power converters into a coordinated system where they work together to maintain power transmission efficiency. By combining the capabilities of multiple converters and controlling them in coordination, the system achieves efficient power transfer while managing the complexity through integrated control rather than separate independent systems.
Solution Approach 2:
The patent implements feedback control mechanisms where the controller continuously monitors the power requirements and the operation status of multiple power converters, and adjusts their operation accordingly. This feedback loop enables the system to maintain optimal power transmission efficiency while dynamically adapting to load changes, managing the complexity through intelligent control rather than hardware simplification.
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 system maintains efficient power transfer by dynamically controlling the alternating current power based on load requirements, thereby stabilizing power transmission efficiency despite variations in load power.
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
Implementation Method 2
The resonance based coupling systems employ resonant coils, which are operated at a system frequency to transmit power between the two locations 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.