Wireless Power Transfer Frequency Coordination
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Solution Overview
Problem
In contactless power transfer systems, the adjustment of power transmission frequency and resonance frequency often interfere with each other, making it difficult to achieve appropriate frequency settings efficiently.
Innovation Solution
A controller in both the power transmitting and receiving devices determines the capabilities of each device to adjust their respective frequencies, allowing for coordinated control to prevent interference and ensure controllability by prioritizing the control with higher resolution or adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both power transmitting device and power receiving device adjust their frequencies independently, then each device can optimize its own frequency control, but the two frequency adjustments interfere with each other and may take a long time to adjust
Solution Approach 1:
The power transmitting device performs preliminary actions by determining the power receiving device's resonance frequency adjustment capability through communication before starting frequency adjustment. Based on this preliminary information, the transmitting device decides whether to adjust its own transmission frequency or rely on the receiving device to adjust resonance frequency, thereby avoiding interference and improving adjustment efficiency
Solution Approach 2:
The system implements feedback mechanism where the power transmitting device obtains information from the power receiving device about its resonance frequency adjustment capability. This feedback information is used to make informed decisions about frequency adjustment strategy, ensuring coordinated control and preventing interference between the two devices
2Measurement precision
If the power transmitting device adjusts power transmission frequency, then frequency optimization can be achieved, but interference occurs when the power receiving device simultaneously adjusts resonance frequency
Solution Approach 1:
Information communication serves as an intermediary mechanism between the power transmitting device and power receiving device. The transmitting device uses this intermediary channel to obtain capability information from the receiving device and coordinate frequency adjustment actions, ensuring that only one device adjusts frequency at a time to maintain control reliability
Solution Approach 2:
The system dynamically adapts its control strategy based on the power receiving device's capability. When the receiving device has resonance frequency adjustment capability, the transmitting device adjusts transmission frequency; when the receiving device lacks this capability, the transmitting device refrains from adjusting frequency. This dynamic adaptation prevents control interference while maintaining frequency optimization
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 approach enables efficient frequency adjustment, reducing interference and ensuring optimal power transfer efficiency by aligning frequency controls based on controllability, thereby improving the overall performance of the contactless power transfer system.
Implementation Method 1
a power transmitting unit configured to contactlessly transmit alternating-current power to be transmitted to a power receiving unit
Data Source
AI summary
A power transmitting device is configured to perform a “power transmission frequency adjustment control” applied to adjust a power transmission frequency representing a frequency of power to be transmitted. A power receiving device is configured to perform a “resonance frequency adjustment control” applied to adjust a resonance frequency of a power receiving unit contactlessly receiving the power transmitted from the power transmitting device. The power transmitting device uses control information received from the power receiving device to determine whether the power receiving device has a function of performing the resonance frequency adjustment control applied to adjust the resonance frequency of the power receiving unit. When the power receiving device has the function of performing the resonance frequency adjustment control, the power transmitting device selects one of the power transmission frequency adjustment control and the resonance frequency adjustment control that has a higher resolution.