Wireless Power Frequency Identification via Current Ratio
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Solution Overview
Problem
Existing wireless power transfer systems for electric vehicles face inefficiencies due to varying alignment positions and non-constant parameters affecting the ideal operation frequency, leading to suboptimal energy transfer and potential bifurcation issues.
Innovation Solution
The system determines an ideal operation frequency by performing an initial charging routine at a low power level, where the current ratio between the transmitter and receiver is maintained constant, allowing for stable operation and reduced power consumption, without real-time frequency adjustments, using an active tuning circuit to adjust the receive circuit and maintain the ideal frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If real-time frequency adjustments are implemented to maintain ideal operation frequency, then energy transfer efficiency is improved, but system complexity and hardware requirements increase
Solution Approach 1:
The system performs an initial charging routine at low power levels to determine the ideal operation frequency before normal charging begins. This preliminary frequency identification eliminates the need for real-time frequency adjustments during charging, reducing system complexity while maintaining energy transfer efficiency.
Solution Approach 2:
The system changes operating parameters by using constant pad currents at low power levels during the initial charging routine to identify ideal frequency, then transitions to normal charging at higher power levels without real-time frequency adjustments, simplifying the control system.
2Productivity
If high power levels are used for charging, then charging speed is improved, but system stability and power consumption increase
Solution Approach 1:
The system performs frequency identification at low power levels before transitioning to high power charging. This preliminary action ensures the system operates at the ideal frequency during high-power charging, maintaining stability while achieving fast charging speeds.
Solution Approach 2:
The system uses periodic constant current charging phases at low power levels to identify ideal frequency characteristics, then applies these characteristics during high-power charging cycles, combining stability measurements with high-speed charging.
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 ensures stable operation and minimizes power consumption by finding the ideal system frequency at low power levels, maintaining constant pad currents, and reducing the need for additional hardware or sense signals, while ensuring efficient energy transfer.
Implementation Method 1
a transmit circuit configured to, during a first time period, transmit power at a first power level to the wireless power receiver
Implementation Method 2
a processor circuit configured to determine a frequency for transmitting power at a second power level based on a ratio of a current level of the wireless power receiver to a current level of the transmit circuit
Data Source
AI summary
The present disclosure described herein relates to wireless power transfer systems and methods that efficiently and safely transfer power to electronic devices. In an aspect of the disclosure, a method for wirelessly transmitting power is provided. The method includes during a first time period, transmitting power at a first power level from a wireless power transmitter to the wireless power receiver. The method further includes determining a frequency for transmitting power at a second power level based on a ratio of a current level of the wireless power receiver to a current level of a wireless power transmitter at the first power level. The method further includes during a second time period, transmitting power at the second power level and at the frequency, the first power level lower than the second power level.