High-Efficiency Orientation Insensitive WPT Systems Using Magnetic Dipole Coil for Low-Power Devices

In this letter, a novel kind of coupling mechanism for orientation insensitive and superior transmission performance is proposed. The transmitting coil is comprised of a cubic-type magnetic dipole, which can achieve relatively omnidirectional wireless charging. The receiving coil has two dipole coils that are perpendicular to each other, guaranteeing a maximum magnetic flux reception from the transmitter. The proposed coupling mechanism is verified by the ANSYS Maxwell software. LCC-S compensation topology is implemented to achieve load-independent and constant-voltage output simultaneously. The reasonable size of the prototype is fabricated, and the experimental results show that the stable efficiency and output power can be achieved against rotational misalignment. Our new coil structure designs significantly improve the free degree of direction and may provide a flexible power supply to low-power devices.