Aiming at leakage of electric connectors working in seawater
a model of three-coil magnetic resonance-based wireless power transfer system is established
which contains launch coil
receive coil and load coil. The receive coil has high quality factor
and the load coil is made by one-turn wire to reduce the resistance
hence the problem of low efficiency in two-coil and four-coil models is solved. The transmission characteristic of electromagnetic wave in seawater is analyzed. The relationships of output power and efficiency with underwater transmission distances from each coil to the other are also discussed. A three-coil prototype of magnetic resonance-based wireless power transfer system is designed
and the experiments show that the prototype efficiency reaches 60% for distance of 12 cm in seawater.
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references
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