Wireless Power Transmitter Frequency Scanning for Efficiency
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Solution Overview
Problem
Existing wireless power transmission technologies require precise positioning and communication to optimize power transfer efficiency, which can be inconvenient and inefficient.
Innovation Solution
A wireless power transmission apparatus that uses a processor to set an operating frequency by transmitting pilot power within a predetermined range, determining the optimal frequency based on the received power magnitude, and then transmitting driving power at that frequency without the need for precise positioning or communication with the reception apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transmission is performed without position fixing or communication, then ease of operation is improved, but power transmission efficiency deteriorates
Solution Approach 1:
The system performs preliminary frequency scanning by transmitting pilot signals at multiple frequencies before actual power transmission. This preliminary action identifies the optimal frequency for power transfer without requiring position fixing or communication, thereby maintaining ease of operation while ensuring efficient power transmission.
Solution Approach 2:
The system changes the frequency parameter of the transmitted signal by testing multiple frequencies within a predetermined range. By identifying the frequency that maximizes power transfer efficiency through this parameter variation, the system achieves efficient power transmission without requiring precise positioning or communication protocols.
2Loss of energy
If pilot power transmission is performed at multiple frequencies, then power transmission efficiency is improved, but use of energy increases
Solution Approach 1:
The system transmits pilot signals at multiple frequencies to partially scan the frequency range, sufficient to identify the optimal frequency without exhaustively testing all possible frequencies. This partial action approach balances the need for efficient power transmission with the cost of energy consumption during the frequency scanning phase.
Solution Approach 2:
The system uses feedback from the power reception apparatus by detecting the magnitude of current input to the coil at each frequency. This feedback mechanism allows the system to identify the optimal frequency based on the received power magnitude, ensuring efficient power transmission while minimizing unnecessary energy expenditure on frequency scanning.
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
Enables convenient and efficient wireless power transmission to a wireless power reception apparatus by predicting its position and setting the appropriate operating frequency, thereby improving power transfer efficiency.
Implementation Method 1
wireless power transmission means a power transmission method in which power energy is converted into an electromagnetic wave which may be wirelessly transmitted
Data Source
AI summary
A wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus is provided. The wireless power transmission apparatus includes a power transmitting circuit including a coil and at least one processor to control to transmit, via the power transmitting circuit, a pilot power with changing a frequency of the pilot power within a predetermined frequency range, obtain a magnitude of power wirelessly transmitted to a wireless power reception apparatus based on the transmitted pilot power, determine an operating frequency based on the obtained magnitude, and control to transmit, via the power transmitting circuit, a driving power having the operating frequency to drive the wireless power reception apparatus.