2020 年 17 巻 18 号 p. 20200257
Dramatic advancements have been witnessed for the magnetic resonant coupling wireless power transfer technology used in various portable electronic devices. A novel omnidirectional wireless power transfer system was proposed in this paper. Instead of conventional planar coils, a multidirectional receiver inside the transmitter was designed to receive the electromagnetic energy from all the directions. As expected, the finite element simulation results show that the distribution of magnetic field is uniform at different positions inside the transmitter. And the power transfer efficiency (PTE) of the newly designed system with the multidirectional receiver is obviously greater than that of the conventional system with the planar coil. Effects of the different receiver structural sizes on the system performance were discussed. PTE of the system becomes higher when the receiver is larger. Furthermore, PTE is insensitive to position and angular misalignment of the multidirectional receiver. The experimental measurments show that PTE of the system with the multidirectional receiver is 26% at the frequency of 6.78 MHz. The newly designed magnetic resonant coupling wireless power transfer system will be significative for the electronic devices indoor.
