A Regional Coupling Enhanced Omnidirectional Wireless Power Transfer System With Low-Fluctuation Regulation Strategy

Omnidirectional wireless power transfer (OWPT) systems can significantly enhance the charging freedom of the receiver (RC). Nevertheless, variations of RC position bring upon non-negligible output fluctuations, affecting the system stability and efficiency. Existing researches focus on the optimization of magnetic coupling structure (MCS) while being constrained by high control complexity. In this letter, a regional coupling enhanced OWPT system with low-fluctuation regulation strategy is proposed for consumer electronics products (CEP). Firstly, a MCS with self-decoupling multi-transmitter coils (TCs) of the OWPT system is discussed in detail. Secondly, a regulation strategy with high output stability and system efficiency under different working conditions is proposed, which requires only the adjustment of the input phase shift angle on the corresponding TC. Finally, a 100 V/100 kHz experimental prototype is built to validate the regulation strategy of the OWPT system. Experimental results show that the output voltage can be stabilized between 6.31V and 6.67V within a 90° rotational range, with a maximum fluctuation rate of 4.78% and the system efficiency is all over 76%. Meanwhile, in the planar region, the output voltage remains stable between 28.6V and 29.7V, with a maximum fluctuation rate of 3.79% and an average system efficiency of 86.9%.