The transmission efficiency of wireless power supply to electric vehicles by microwave is improved. This was announced by Kyoto University of Japan and UD Trucks (renamed from Nissan Diesel Engine Industry on February 1, 2010) at the "Electronic Information and Communication Society 2010 General Assembly" held at Tohoku University, Japan on March 16, 2010 ( Speech number: BS-9-10).
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The microwave-based wireless power supply system is as follows. First, the microwave energy is radiated by a Waveguide Slot Antenna disposed on the ground, and then charged and rectified by a rectifying antenna mounted on the bottom of the vehicle, and finally the power is stored in the rechargeable battery. The rectifying antenna is composed of a patch antenna and a rectifying circuit. A 2.45 GHz magnetron is used in the microwave generation source.
The research team has previously confirmed the power transmission based on the above system. However, there is a problem that the transmission efficiency between the slot antenna and the patch antenna is low. The reason is that the radio waves will leak out of the antenna. Since the patch antenna has a narrow directivity, the power receiving performance of the power radiated from the slit located in the oblique direction is lowered. When using four patch antennas, the transmission efficiency is only 53.7%.
To this end, the research team increased the patch antenna to 12 and set the eight patch antennas disposed directly above the slot antenna to be tilted, and obtained a simulation result in which the transmission efficiency can be improved to 83.7%. The electric field intensity on the plane formed by the transmitting and receiving antennas is plotted as a graph, and it is found that the power receiving efficiency at the time of tilting is more excellent than when all of the 12 patch antennas are placed in a planar state.
The efficiency obtained after actual trial production and measurement of transmission efficiency was 76.0%. Although slightly lower than the transmission efficiency of the simulation results, it has been confirmed that adjusting the antenna configuration can improve the transmission efficiency. The power transmission and receiving distance at this time is 90 mm. In addition, after adding a charging system such as a DC-DC converter and a rectifying circuit, the efficiency is 33.5%. The research team will optimize the system in the future to improve overall efficiency. (Reporter: Jiu Mi Xiu Shang)
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