Load monitoring and output voltage control for SP topology IPT system using a single-side controller without any output measurement

This paper presents the method to estimate load value and output voltage of the inductive power transfer (IPT) system with series-parallel (SP) compensation topology. This technique uses primary side measured variables without the need of secondary side measurement and communication devices between the circuits. In addition, the magnitude of the output voltage has been controlled by using only a single-side controller located in the primary circuit. The Phase shift (PS) control of the full-bridge inverter is used instead of the primary side DC-DC converter to regulate the output voltage. This lowers the overall system cost, size, complexity and loss compared to the conventional IPT dual-side controllers. The proposed estimation technique has been investigated through phasor analysis of the mutual inductance coupling model and also verified by the computer simulation. Performance of the proposed primary side single controller against the step change in output voltage reference and load value is shown in the simulation results. Experimental results of the output voltage control against load variation validating the viability of the proposed single-side controller.