A Noncommunication Mutual Inductance Estimation Method for Multiple Transmitters SS-Compensated Dynamic Wireless Power Transfer With Low Calculation Effort

Mutual inductance estimation (MIE) plays an essential role in the primary-side control for dynamic wireless power transfer (DWPT) systems. Traditional MIE method that is only based on primary-side transmitter (Tx) information contributes to no redundant hardware components. However, this method can cause huge calculation effort in multi-Txs DWPT systems because it involves the solution of multivariable multiple equations. In this letter, a new method for estimating mutual inductance for series-series (SS)-compensated multi-Txs DWPT systems is proposed, where dual-side communication and auxiliary position sensor are not required. By first solving the mutual inductance ratio and then calculating the exact mutual inductance, the proposed method is proven to avoid solving multiple equations, thus greatly reducing complexity of the calculation. This study also includes simulations and experiments that are carried out in a DWPT system with two Txs to one receiver (Rx).