Efficiency Optimization Strategy Based on Optimal Equivalent Load in Inductively Coupled Power Transfer System with Parallel Multi-Pickups

A novel efficiency optimization strategy based on optimal equivalent load in inductively coupled power transfer (ICPT) system is proposed to enhance system efficiency. The relationship between the load and the efficiency of ICPT systems with parallel multi-pickups is analyzed. An optimal load resistance is obtained with parameters of contactless transformer at which the efficiency is the highest. BOOST circuit is introduced to transfer the load into near optimal resistance region. A prototype has been constructed and the experiment has been carried out to verify the proposed strategy. The experimental results show the improved efficiency under light load.