Ichimura Foundation for New Technology Grant for New Technology Development 116th New Technology Development - 04
Wireless power transfer, which eliminates the need for cables and connectors, is expanding primarily in small appliances such as mobile phones, electric toothbrushes, and lighting, and it is expected to further advance in applications for electric vehicles, electric wheelchairs, and drones in the future.
There is a magnetic field resonance method for wireless power transfer that allows for a large distance between the power transmission coil and the receiving coil, but it requires optimization of circuit parameters according to the distance, and there was a significant issue where transmission power would drastically decrease due to distance variations caused by positional shifts.
Therefore, we are developing a wireless power transfer device that maintains stable transmission power despite fluctuations in the positional relationship between the power transmission coil and the receiving coil.
In the devised device, circuit parameters are set to exhibit PT symmetry (time-space inversion symmetry) to minimize power loss, and to accommodate variations in current resonance frequency due to changes in coil distance, the current of the power transmission coil is detected, and the gate timing of the switching element is controlled to maintain the circuit's current at the resonance frequency.
As a result, we have demonstrated that high power transmission efficiency can be maintained even with significant changes in position and distance.

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