Analysis of Bifurcation in Two-Coil Inductive Power Transfer

Operation of two-coil inductive power transfer (IPT) is affected by the bifurcation phenomenon. So far, its dependence on primary and secondary quality factors was examined. However, similar dependencies exist for coupling coefficient and resonance frequency. In this paper, these dependencies and their mutual relationships are examined. This analysis is based on the normalized impedance approach and provides a calculation of all zero phase angle frequencies. IPT system behavior is examined from a perspective of input and output active power and efficiency. Finally, an automated simulation model is proposed as a mean of effective verification.