An anti-offset hybrid topology constant current wireless charging system

There is a practical problem of reduced charging efficiency due to offset in the wireless charging system for electric vehicles. Thus a new type of strong offset-resistant constant-current wireless charging system is proposed. First, in the magnetic coupling design, a DDQD large decoupling coil is introduced to effectively slow down the attenuation of the coupling coefficients of the X and Y direction offsets, and the comparison with the DDQ coil reflects the superiority of the proposed DDQD coil in anti-offset. Then, in the compensation topology design, the LCC and LC topologies, which have different trends with the coupling coefficients, are connected in series by DDQD coils, so that the output power changes are smoothed out. This further improves the system’s ability to resist offsets and provides the system with constant-current output characteristics. Finally, the effectiveness of the scheme is verified through simulation. The scheme slows down the degradation degree of the coil coupling coefficient and transmission efficiency of the wireless charging system when the magnetic coupling mechanism is offset. This is of practical significance. © 2024 Power System Protection and Control Press. All rights reserved.